AUTHOR=Chen Wanting , Zhang Han , Liang Yu , Ding Hao , Sun Sijia 

TITLE=Adsorption Properties and Mechanism of Cd2+ in Water by Zr-containing Silica Residue Purification

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 6 - 2018

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00556

DOI=10.3389/fchem.2018.00556

ISSN=2296-2646

ABSTRACT=Zr-containing silica residue purification discharged from industrial production of ZrOCl2 was used as adsorbent, CdCl2 solution was used as simulated wastewater containing Cd2+, the properties and mechanism of ZSR-P absorbing Cd2+ were studied. The results showed that ZSR-P had a good effect of adsorption and removal of Cd2+ in water. The adsorption time, initial concentration of Cd2+ and solution pH had a significant effect on the adsorption behavior, and pH value had the greatest effect among them. Under the optimal conditions, the amount of Cd2+ adsorbed by ZSR-P was 43.1mg/g. The isothermal adsorption conformed to the Langmuir adsorption model and the adsorption kinetics conformed to the secondary adsorption rate model. In the ZSR-P-Cd, Cd2+ was uniformly distributed on the surface of SiO2 particles and in the voids formed by the accumulation of particles. Adsorption of Cd2+ by ZSR-P was achieved through the reaction between Si-OH on the surface of SiO2 and Cd2+ hydroxyl compounds.