The commonly used methods for removing arsenic include adsorption, coagulation and ion exchange. What are the specific requirements for arsenic removal by activated alumina?
1. The optimum pH for the adsorption of arsenic by activated alumina is 4~6, the removal rate is maintained above 95%, and the maximum removal rate is 99% when the pH is about 5.5.
2, activated alumina adsorption of arsenic by fluoride ions, carbonate ions and phosphate ions have a greater impact, nitrate and sulfate have no effect, and chloride ions have the effect of promoting adsorption;
The adsorption of arsenic on activated alumina can be well fitted by Langmuir adsorption isotherm, which belongs to monolayer adsorption. The maximum adsorption capacity is 15.7mg/g; its kinetics accord with Lagergren second-order kinetic model.
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