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Zirconium (Zr)-containing silica residue purification (ZSR-P) discharged from industrial production of ZrOCl 2  was used as an adsorbent, and CdCl 2  solution was used as the simulated wastewater containing cadmium ions (Cd 2+ ). The properties and mechanisms of ZSR-P absorbing Cd 2+  were studied. The results showed that ZSR-P had a good effect on the adsorption and removal of Cd 2+  in water. The adsorption time, initial concentration of Cd 2+ , and pH of the solution had a significant effect on the adsorption behavior, whilst the pH value had the greatest effect amongst them. Under optimal conditions, the amount of Cd 2+  adsorbed by ZSR-P was 43.1 mg/g. The isothermal adsorption conformed to the Langmuir adsorption model, and the adsorption kinetics conformed to the secondary adsorption rate model. In ZSR-P-Cd, Cd 2+  was uniformly distributed on the surface of SiO 2  particles and in the pores formed by the accumulation of particles. Adsorption of Cd 2+  by ZSR-P was achieved through the reaction between Si-OH on the surface of SiO 2  and Cd 2+  hydroxyl compounds.

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