Harnessing the power of novel ruthenium-MOF for efficient wastewater treatment

A novel metal-organic framework (MOF) was synthesized using 4,4'-(diazene-1,2-diyl)dibenzoic acid and ruthenium (III) chloride via microwave-assisted synthesis. The resulting ruthenium-MOF exhibited a high specific surface area (1856 m²/g), and the inclusion of ruthenium, known for its biological activity, endowed the structure with potent antimicrobial properties against key wastewater bacterial strains. Furthermore, its abundant hydrogen bonding sites enhanced its adsorption capacity for phenol red, a major waterborne pollutant. The synthesized MOF demonstrated superior antimicrobial activity compared to certain commercial antibiotics. In adsorption experiments, 0.06 g/L of the MOF successfully removed 92% of 0.6 mg/L phenol red at pH 7 within 75 min, highlighting its rapid and efficient pollutant removal capability. These dual functions, antimicrobial and adsorptive, emphasize the potential of this ruthenium-MOF for practical environmental remediation and wastewater treatment applications.

1 Introduction

Phenol red is a widely used water-soluble dye that functions primarily as a pH indicator. It exhibits a color transition from yellow to red within the pH range of 6.6–8.0 and turns bright pink at pH values above 8.1 (Steinegger et al., 2020). Due to its sensitivity to pH changes, phenol red finds extensive applications in biomedical research, histology (Benson et al., 2022), environmental monitoring (Idris et al., 2024), culture media (Raffay et al., 2022), pool testing kits (Qin et al., 2023), and cell culture systems (Weiskirchen et al., 2023). Although it is not classified as carcinogenic, concerns regarding its toxicological effects have been raised. Contact with skin may lead to sensitization and irritation (Olusegun and Martincigh, 2021), while eye exposure can result in damage (Kecskeméti et al., 2022). Ingestion is also considered hazardous (DeLoid et al., 2024; An et al., 2025). Given its widespread usage and environmental persistence, phenol red is commonly detected in wastewater and is regarded as a potentially harmful pollutant.

In addition to chemical contaminants such as phenol red, wastewater is frequently burdened with biological pollutants, particularly pathogenic microorganisms. Bacteria including Salmonella enterica, C. jejuni, E. coli, L. pneumophila, and Shigella dysenteriae are commonly identified in untreated or poorly treated wastewater (Bej et al., 2023; Singh et al., 2024). These pathogens pose serious health threats: S. enterica is responsible for typhoid fever (Abro et al., 2024); Campylobacter jejuni causes fever and watery diarrhea (Zouganeli et al., 2024); Escherichia coli is associated with gastroenteritis (Roy et al., 2024); Legionella pneumophila may lead to Pontiac fever (Perez Ortiz et al., 2021); and S. dysenteriae results in severe dysentery and intestinal ulceration (Moxley, 2022). Effective strategies are therefore required to remove both chemical and biological pollutants from wastewater to safeguard public and environmental health.

A variety of methods have been investigated for phenol red removal, including chemical treatments (Abu-Nada et al., 2021) and adsorption techniques employing nanomaterials (Ho, 2022; Mousavi et al., 2023). Among advanced adsorbents, metal-organic frameworks (MOFs) have gained considerable attention due to their tunable porosity, high surface area, and diverse chemical functionalities (Song and Qin, 2022).

Some MOFs have demonstrated promising industrial and biomedical applications, including catalysis (Wang et al., 2025) and antibacterial activity (Li et al., 2025). Their antimicrobial properties are often attributed to the presence of metal centers, which disrupt microbial membranes, and to structural features such as porosity and surface area that promote physical entrapment or interaction with pathogens (Borsagli et al., 2019; Li et al., 2021; Arunkumar et al., 2024; Ding et al., 2024; Sharafudheen et al., 2024). High specific surface area in particular enhances contact between the MOF surface and target pollutants, thereby improving both adsorption efficiency and antimicrobial activity (Farasati Far, 2024; Hu et al., 2024; Yao et al., 2024; Zhang et al., 2024).

Ruthenium is a transition metal known for its biological activity and has been incorporated into various MOFs with demonstrated potential for therapeutic and environmental applications (Nakhjiri et al., 2022; Skoczynska et al., 2023). Ruthenium-based compounds have shown anti-inflammatory and antimicrobial properties (Southam et al., 2017; Singh and Barman, 2021; Liu et al., 2022), and their integration into MOF structures can enhance resistance to degradation while preserving or even improving functional performance (Naseer et al., 2022; Rajendran et al., 2024).

In this study, a novel ruthenium-based MOF was synthesized using ruthenium (III) chloride and 4,4'-(diazene-1,2-diyl)dibenzoic acid. Owing to its large specific surface area and presence of biologically active sites, the material was evaluated for its capacity to adsorb phenol red and inhibit bacterial pathogens commonly found in wastewater. The results demonstrated that the synthesized ruthenium-MOF exhibited high efficacy in removing both chemical and biological contaminants. The antimicrobial activity of ruthenium, coupled with the MOF’s porosity and extensive surface area, contributes to its strong potential for dual-function wastewater treatment. This underscores the novelty and practical relevance of our findings in addressing complex pollution challenges.

2 Materials and methods

2.1 Material and devises

Ruthenium (III) chloride (99.95%, Otto Chemie Pvt. Ltd.) and 4,4'-(diazene-1,2-diyl)dibenzoic acid (95%, Ambeed) were used as precursors for the synthesis of the ruthenium-MOF. Mueller Hinton Agar and Mueller Hinton Broth (HiMedia) were utilized for antimicrobial studies, and bacterial strains were obtained from the American Type Culture Collection (ATCC). Phenol red (analytical grade), sodium hydroxide (99.95%, Merck), and hydrochloric acid (37%, Merck) were used in the phenol red adsorption studies.

A BP211 laboratory-grade microwave reactor was employed for MOF synthesis, while an LMSP-UV1000B UV-Visible spectrophotometer was used to assess pollutant adsorption and antimicrobial efficacy.

2.2 Synthesis of ruthenium-MOF

To synthesize the ruthenium-MOF, 1 mmol of ruthenium (III) chloride and 2 mmol of 4,4'-(diazene-1,2-diyl)dibenzoic acid were dissolved in 25 mL of deionized water and stirred at 500 rpm at room temperature until a homogeneous solution was obtained. The mixture was then exposed to microwave irradiation. The temperature was gradually increased from 25°C to 180°C at a rate of 10°C/min and maintained at 180°C for 20 min under continuous irradiation at 320 W. After cooling for 30 min, the resulting precipitate was separated via nanofiltration, washed three times with a 1:1 mixture of deionized water and ethanol, and dried under vacuum at 100°C for 4 h (Al-dolaimy et al., 2023; Ahmad et al., 2024)

2.3 Characterization

To confirm the structure and properties of the synthesized ruthenium-MOF, the following characterization techniques were used:

Nitrogen adsorption/desorption analysis: Conducted at 77 K with relative pressures from 0.01 to 0.99 using the ASAP 2020 instrument to determine BET surface area and pore size distribution via BJH or DFT models.

X-ray diffraction (XRD): Performed using Cu Kα radiation at 40 kV/30 mA over a 2θ range of 10°–70°, with a step size of 0.02° and scan speed of 1 s/step (Drawell DW-XRD-27Mini Desktop).

Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDAX): Conducted using a TESCAN VEGA 3 at 15 kV with a working distance of 10 mm in high vacuum mode.

Elemental analysis (CHNO): Carried out using a FlashSmart Elemental Analyzer by combustion in excess oxygen at 1100°C.

Fourier-transform infrared spectroscopy (FT-IR): Acquired using the KBr pellet method on a DW-FTIR-530A Drawell spectrometer.

Thermogravimetric analysis (TGA): Conducted from 25°C to 600°C at a heating rate of 10°C/min using a GA BXT-TGA-1250.

2.4 Wastewater treatment

2.4.1 Inhibition of biological agents

The antimicrobial efficacy of the synthesized ruthenium-MOF was assessed using a range of concentrations (1–1024 μg/mL) against bacterial suspensions (1 × 10⁵ CFU/mL) of selected wastewater pathogens. The methods and standards established by the Clinical and Laboratory Standards Institute (CLSI) were followed in accordance with previous studies (Moghaddam-Manesh et al., 2020; Hsu et al., 2024). The tests performed included:

Minimum Inhibitory Concentration (MIC): A mixture of 100 μL of ruthenium-MOF solution (various concentrations), 100 μL of Mueller Hinton Broth, and 10 μL of bacterial suspension was incubated at 37°C for 48 h. The MIC was defined as the lowest concentration that completely inhibited visible bacterial growth (Moghaddam-Manesh et al., 2020; Hsu et al., 2024).

Minimum Bactericidal Concentration (MBC): Aliquots from the MIC test and subsequent dilutions were plated on Mueller Hinton Agar and incubated at 37°C for 72 h. The MBC was recorded as the lowest concentration at which no bacterial colonies were observed (Moghaddam-Manesh et al., 2020; Hsu et al., 2024).

Inhibition Zone Diameter (IZD): The disk diffusion method was employed using sterile paper disks impregnated with 10 μL of ruthenium-MOF at MIC concentrations. The disks were placed on inoculated agar plates and incubated at 37°C for 48 h. The diameter of the inhibition zone was measured using calipers (Moghaddam-Manesh et al., 2020; Hsu et al., 2024).

2.4.2 Adsorption of chemical agents

Phenol red adsorption experiments were conducted using different initial dye concentrations, MOF dosages, pH levels (4-10), temperatures (25°C–60°C), and contact times (25–200 min). In each test, ruthenium-MOF was added to 25 mL of phenol red solution, and the mixture was agitated at 140 rpm. After the desired reaction time, the suspension was centrifuged at 6000 rpm for 10 min, and the absorbance of the supernatant was measured at 430 nm using a UV-Vis spectrophotometer. The removal efficiency (Re, %) was calculated using the Equation 1 (Aljubiri et al., 2024; Moghaddam-Manesh et al., 2024):

$Re\left(\%\right)=\left(\frac{C0-Ce}{C0}\right)\times 100(1)$

The initial concentration of phenol red (mg/L) = C₀

The equilibrium concentration of phenol red (mg/L) = C_e

Equation 1. Phenol red adsorption percentage using ruthenium-MOF.

3 Result and discussion

3.1 Synthesis and characterization

Microwave-assisted synthesis has emerged as a rapid and efficient method for producing metal-organic frameworks (MOFs) with desirable physicochemical properties. This technique has been reported to yield MOFs with high crystallinity, nanoscale particle size, and large specific surface area (Głowniak et al., 2021; Annamalai et al., 2022). In this study, a ruthenium-based MOF was successfully synthesized using ruthenium (III) chloride and 4,4'-(diazene-1,2-diyl)dibenzoic acid under controlled microwave conditions, following previously optimized protocols (Al-dolaimy et al., 2023; Ahmad et al., 2024).

Nitrogen adsorption/desorption analysis revealed that the synthesized MOF exhibits a remarkably high specific surface area of 1856 m²/g, as illustrated in Figure 1. The isotherms corresponded to a type IV profile, characteristic of mesoporous materials (Calzaferri et al., 2022; Hu et al., 2023; Peng et al., 2024).

Figure 1

Figure 1. Nitrogen adsorption and desorption curve of synthesized ruthenium-MOF [(I): BET, b (II): BJH].

The surface area and pore characteristics, including BET surface area, Barrett–Joyner–Halenda (BJH) pore volume, and mean pore diameter (MPD), are summarized in Table 1.

Table 1

Table 1. N₂ adsorption-desorption of ruthenium-MOF.

X-ray diffraction (XRD) analysis confirmed the crystalline nature of the synthesized MOF (Figure 2). Distinct diffraction peaks were observed at 2θ values of 39.9°, 42.1°, 44.8°, and 58.3°, corresponding to the (101), (102), (110), and (112) planes, respectively, as referenced by JCPDS card No. 06-0663 (Tee et al., 2015; Pang et al., 2021; Wang et al., 2023). The average crystallite size, calculated using the Scherrer equation, was approximately 92 nm (Holzwarth and Gibson, 2011; Nasiri et al., 2023).

Figure 2

Figure 2. XRD of synthesized ruthenium-MOF (I): Reported JCPDS No 06-0663 for ruthenium; (II): Synthesized ruthenium-MOF).

Scanning electron microscopy (SEM) revealed uniform morphology with particle sizes averaging 85 nm and no observable agglomeration (Figure 3).

Figure 3

Figure 3. SEM image of synthesized ruthenium-MOF.

These findings confirm that the adopted synthesis method is effective for producing a highly crystalline and nanoscale MOF with significant surface area and porosity.

Elemental analysis and energy-dispersive X-ray spectroscopy (EDAX) were employed to confirm the presence of ruthenium and other constituent elements. The results are presented in Table 2; Figure 4.

Table 2

Table 2. EA result of ruthenium-MOF.

Figure 4

Figure 4. EDAX of synthesized ruthenium-MOF.

The proposed molecular structure of the ruthenium-MOF, shown in Figure 5, is consistent with the XRD and elemental analysis data.

Figure 5

Figure 5. Structure of synthesized ruthenium-MOF.

Fourier-transform infrared (FT-IR) spectroscopy further verified the structural integrity of the MOF. The spectrum of the synthesized product (Figures 6–II) demonstrated characteristic absorption bands: Ru–N and Ru–O bonds in the 400–600 cm⁻¹ region (Feng et al., 2022; Jin et al., 2022; Akl et al., 2023), C-H at 3025 cm⁻¹, C=O at 1680 cm⁻¹, N=N at 1565 cm⁻¹, C=C at 1460 cm⁻¹, N-C at 1100 cm⁻¹, and C-O at 1025 cm⁻¹. The broad O–H peak at 3250 cm⁻¹, present in the free ligand, was absent in the MOF spectrum, suggesting successful coordination of the ligand through its oxygen atoms.

Figure 6

Figure 6. FT-IR spectrum of 4,4'-(diazene-1,2-diyl)dibenzoic acid (I) and synthesized ruthenium-MOF (II).

The FT-IR spectrum of the ruthenium-MOF, as shown in Figures 6–II, confirms the presence of the ligand in the structure, as all ligand peaks are observed. Additionally, the broad oxygen-hydrogen peak (3250 cm⁻¹), which is absent in the FTIR spectrum of the ruthenium-MOF, indicates the binding of the 4,4'-(diazene-1,2-diyl)dibenzoic acid to the ruthenium through the oxygen side. Therefore, oxygen-ruthenium and nitrogen-ruthenium bonds, observed in previous studies in the 400 cm^-1 - 600 cm⁻¹ (Feng et al., 2022; Jin et al., 2022; Akl et al., 2023), and two peaks have been observed in this area, so Ru-N and Ru-O are sites of ruthenium complexation with the 4,4'-(diazene-1,2-diyl)dibenzoic acid, as seen in the FTIR spectrum of the ruthenium-MOF.

Thermogravimetric analysis (TGA) demonstrated the thermal stability of the ruthenium-MOF. The material remained stable up to approximately 350°C, with two major weight loss events observed around 350°C and 520°C. These correspond to the decomposition of the organic ligand and subsequent breakdown of the MOF network.

3.2 Wastewater treatment results

Given the characterization of the newly synthesized ruthenium-MOF, which had a high specific surface area and high porosity, and the antimicrobial nature of ruthenium, the antimicrobial properties and phenol adsorption were investigated and discussed below.

3.2.1 Results of inhibition of biological agents

As mentioned in the introduction, Salmonella enterica (ATCC 35664), Campylobacter jejuni (ATCC 700819), Escherichia coli (ATCC 25922), Legionella pneumophila (ATCC 33152), and Shigella dysenteriae (ATCC 13313) can be identified as the most important pathogenic agents present in wastewater. The investigation of the inhibition properties of these biological agents by the ruthenium-MOF was conducted using MIC and MBC, as well as measuring the IZD. The findings of these studies are presented in Table 3.

Table 3

Table 3. Antimicrobial results.

The results from the table indicate that the ruthenium-MOF was able to inhibit all the studied strains, with MIC values of 32 μg/mL Salmonella enterica, 16 μg/mL Campylobacter jejuni, 1 μg/mL against Escherichia coli, 32 μg/mL against Legionella pneumophila, and 128 μg/mL against Shigella dysenteriae.

As mentioned, high specific surface area of synthesized ruthenium-MOF and more excellent contact with the studied bacterial agents, along with the presence of a ruthenium compound with strong antibacterial properties and a ligand known to possess several antibacterial properties (Southam et al., 2017; Singh and Barman, 2021; Pourmadadi et al., 2023; Tan et al., 2023), can be considered factors contributing to the effective inhibition of the studied strains. Additionally, C. jejuni, L. pneumophila, and S. dysenteriae were resistant to cefazolin, and S. dysenteriae were resistant to azithromycin, a well-known antibiotic on the market, indicating that the compound synthesized in this study has superior antibacterial properties compared to cefazolin.

Each experiment was independently conducted three times to ensure reproducibility. The MIC and MBC values remained stable across replicates, while the inhibition zone diameters (IZD) are summarized as mean values with corresponding standard deviations (SD). Statistical significance was assessed using p-values to examine the influence of compound concentration on antibacterial activity. The findings suggest a strong concentration-dependent effect on MIC, MBC, and IZD parameters, particularly for the tested Ruthenium-MOF and Azithromycin compounds.

3.2.2 Results of adsorption of chemical agents

The ruthenium-MOF demonstrated excellent adsorption performance for phenol red, attributable to its high surface area, porosity, and abundance of hydrogen bonding sites (Wu et al., 2020; Lau et al., 2022; Zhou et al., 2024). Phenol red exists in two tautomeric forms depending on pH: one in acidic conditions (7-I) and another in alkaline conditions (7-II). The synthesized MOF was able to adsorb phenol red in both environments through hydrogen bonding and electrostatic interactions, as depicted in Figures 7–III.

Figure 7

Figure 7. Structure of phenol red in acidic (I) and alkaline (II) environments and its adsorption by synthesized ruthenium-MOF (III).

To evaluate the adsorption performance, several experimental parameters were optimized, including initial dye concentration, adsorbent dose, pH, temperature, and contact time.

3.2.2.1 Phenol red concentration effect

Phenol red concentrations ranging from 100 to 1000 mg/L were tested using 0.01 g of ruthenium-MOF under fixed conditions (pH 7, 25°C, 50 min). As shown in Figures 8–I, the adsorption efficiency decreased with increasing dye concentration. This inverse relationship is attributed to the limited number of active hydrogen bonding sites, which become saturated at higher dye concentrations (Zhang et al., 2021).

Figure 8

Figure 8. Phenol red adsorption study results using synthesized ruthenium-MOF (I: Phenol red concentrations, II: Ruthenium-MOF concentrations, III: pH, IV: Temperature, V: Time).

3.2.2.2 Amount of adsorbent effect

To identify the optimal adsorbent dosage, various concentrations of ruthenium-MOF (0.01–0.10 g/L) were tested. The results (Figures 8–II) indicate that adsorption increased with increasing adsorbent amount, reaching a plateau at 0.06 g/L. Beyond this point, additional adsorbent did not significantly improve removal efficiency, likely due to particle agglomeration and site carbonization (Poon et al., 2022). Therefore, 0.06 g/L was used in subsequent experiments.

3.2.2.3 pH effect

Phenol red adsorption was evaluated across a pH range of 4–10, maintaining constant adsorbent dose, temperature, and contact time. Maximum adsorption occurred at pH 8 (Figures 8–III). At this pH, the anionic form of phenol red interacts more effectively with electron-rich oxygen and nitrogen atoms in the MOF structure. Conversely, extreme acidic and alkaline conditions were detrimental to adsorption, likely due to hydrolysis or protonation effects (Siddique et al., 2024; Pessoa and Correia, 2021; Yesil et al., 2021). Nevertheless, since the difference between pH 7 and pH 8 was minimal, further tests were conducted at neutral pH.

3.2.2.4 Temperature effect

Temperature variation (25°C–60°C) showed a positive correlation with adsorption performance (Figures 8–IV). Higher temperatures enhanced molecular motion and diffusion rates, resulting in increased adsorption of phenol red (Qiu et al., 2022).

3.2.2.5 Time effect

Adsorption were evaluated over contact times ranging from 30 to 120 min. Maximum adsorption occurred at 75 min, after which equilibrium was reached (Figures 8–V). The saturation of active adsorption sites explains the observed plateau beyond this time point.

The excellent adsorption performance is largely attributed to the high surface area and mesoporosity of the MOF structure, which provide abundant access to active binding sites (Dendy et al., 2025). Under optimal conditions (0.06 g/L MOF, 0.6 mg/L phenol red, pH 7, 25°C, 75 min), the ruthenium-MOF achieved 92% removal efficiency (23 mg/g), outperforming several previously reported MOFs (Table 4).

Table 4

Table 4. Comparison dye adsorption of ruthenium-MOF with other MOFs.

Compared to the uranyl-curcumin-MOF (Khandan et al., 2018), which only removed 0.11 mg/L, the ruthenium-MOF performed significantly better. While some other MOFs (e.g., Cu-BTC) showed higher absolute adsorption capacities, they were tested against different dyes, often at higher concentrations and under different conditions. The advantage of ruthenium-MOF lies in its fast kinetics, high surface area, and ability to work efficiently at neutral pH, making it highly practical for real wastewater treatment.

3.2.3 Reusability

After the adsorption process, the synthesized ruthenium-MOF was washed three times with water and ethanol and it was placed in an oven at 100°C for 4 h under vacuum conditions. It’s TGA (Figures 9–I), FT-IR (Figures 9–II), and XRD (Figures 9–II) was prepared and no significant change was observed compared to before use. Only in the TGA curve was a weight loss observed near 100°C, which can be attributed to the evaporation of water absorbed on the surface or pores of the MOF, which occurred during the absorption or washing process. Then, the adsorption process was re-evaluated under obtained optimal conditions. The results showed that under obtained optimal conditions, including phenol red concentrations (0.6 mg/L), ruthenium-MOF concentrations (0.06 g/L), pH (7), temperature (25°C), and time (75 min), the percentage adsorption did not change significantly up to three times (Figures 9–IV).

Figure 9

Figure 9. XRD (I), FT-IR (II) and TGA (III) of ruthenium-MOF after the adsorption process, and its reusability in phenol red adsorption (IV).

3.2.4 Kinetic modeling in phenol red adsorption using ruthenium-MOF

To investigate the adsorption mechanism and rate-controlling steps, kinetic studies were conducted using pseudo-first-order and pseudo-second-order models. These models provide insight into the nature of the interaction between phenol red molecules and the active sites of the ruthenium-MOF.

3.2.4.1 Pseudo-first-order

The pseudo-first-order equation is as follows (Equation 2):

$\ln \left(\text{qe}-\text{qt}\right)=\ln \text{qt}–{\mathrm{k}}_1\mathrm{t}(2)$

k₁ = 0.0457 min⁻¹

q_e = 9.32 mg/g.

Equation 2. Pseudo-first-order in phenol red adsorption using ruthenium-MOF.

Suitable when the adsorption rate depends on available vacant sites.

3.2.4.2 Pseudo-second-order

The pseudo-second-order is as follows (Equation 3):

$\frac{t}{qt}=\frac{1}{k_{2}q{e}^2}+\frac{t}{qe}(3)$

k₂ = 0.00655 g/mg.min.

q_e = 10.59 mg/g.

Equation 3. Pseudo-second-order in phenol red adsorption using ruthenium-MOF.

Assumes chemisorption as the rate-limiting step.

Based on the results in Figure 10; Table 5, the pseudo-second-order model fits the data better and predicts a higher adsorption capacity, which is consistent with the assumption of chem-adsorption. Also, the saturation of the adsorbent surface at ∼75 min is also consistent with the behavior of the second model.

Figure 10

Figure 10. Kinetic modeling of phenol red adsorption using ruthenium-MOF.

Table 5

Table 5. Kinetic model parameters phenol red adsorption using ruthenium-MOF.

3.2.5 Isotherm modeling in phenol red adsorption using ruthenium-MOF

To better understand the adsorption behavior and surface interactions, isotherm models were applied. Both Langmuir and Freundlich models were evaluated using experimental equilibrium data.

3.2.5.1 Langmuir isotherm

The Langmuir isotherm equation is as follows (Equation 4):

$\text{qe}=\frac{q_{\max K_{L}Ce}}{1+K_{L}Ce}(4)$

q_max = 1000 mg/g.

K_L = 0.0314 L/mg.

Equation 4. Langmuir isotherm in phenol red adsorption using ruthenium-MOF.

3.2.5.2 Freundlich isotherm

The Freundlich isotherm equation is as follows (Equation 5):

$qe=K_F{Ce}^{1/n}(5)$

KF = 164.79.

n = 3.33.

Equation 5. Freundlich isotherm in phenol red adsorption using ruthenium-MOF.

Based on the results in Figure 11; Table 6, the Freundlich model better represents the system and supports a heterogeneous multilayer adsorption process.

Figure 11

Figure 11. Isotherm modeling of phenol red adsorption using ruthenium-MOF.

Table 6

Table 6. Isotherm model parameters phenol red adsorption using ruthenium-MOF.

4 Conclusion

In light of the human need for clean water and the challenges posed by population growth, climate change, and limited freshwater resources, this study focuses on the synthesis of a new metal-organic framework (ruthenium-MOF) and its application in treating biological pollutants, specifically the inhibition of bacterial strains Salmonella enterica, Campylobacter jejuni, Escherichia coli, Legionella pneumophila, and Shigella dysenteriae, which are among the most significant pathogens found in wastewater. Additionally, this MOF was designed to remove chemical pollutants such as phenol red, a compound associated with various diseases and skin irritations. The synthesized MOF incorporates ruthenium and 4,4'-(diazene-1,2-diyl)dibenzoic acid as structural components. The biological properties of these compounds, along with the high specific surface area of the ruthenium-MOF, contribute to its unique ability to eliminate both biological and chemical contaminants from wastewater. In biological tests, the MOF showed higher inhibition rates for certain bacterial strains compared to cefazolin and azithromycin. Regarding chemical pollutant removal, the MOF achieved 92% removal of 0.6 mg/L phenol red using 0.06 g/L of the adsorbent at neutral pH and 75 min. Based on kinetic and isotherm studies, the pseudo-second-order model best described the adsorption process, and the Freundlich model best fit the isotherm data. The synthesized ruthenium-MOF demonstrates great potential as an efficient material for wastewater treatment. Further studies are recommended to evaluate its effectiveness against other biological and chemical pollutants.

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article.

Author contributions

AA: Writing – original draft. TA: Writing – original draft. MAA: Writing – review and editing. OA: Writing – review and editing.

Funding

The author(s) declare that financial support was received for the research and/or publication of this article. This study is supported via funding from Prince Sattam Bin Abdulaziz University project number (PSAU/2025/R/1446).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Generative AI statement

The author(s) declare that no Generative AI was used in the creation of this manuscript.

Publisher’s note

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