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Front. Chem. | doi: 10.3389/fchem.2018.00556

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

 Hao Ding1*, Wanting Chen1, Han Zhang1 and Sijia Sun1
  • 1China University of Geosciences, China

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.

Keywords: Zr-containing silica residue purification, Adsorption, Cd2+, kinetic model, Isothermal models

Received: 27 Jul 2018; Accepted: 29 Oct 2018.

Edited by:

Wenbo Wang, Lanzhou Institute of Chemical Physics (CAS), China

Reviewed by:

Shiyong Sun, Southwest University of Science and Technology
JIANXI ZHU, Guangzhou Institute of Geochemistry (CAS), China  

Copyright: © 2018 Ding, Chen, Zhang and Sun. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Hao Ding, China University of Geosciences, Beijing, China, dinghao113@126.com