Adsorption Kinetics and Mechanism of Different Adsorption Materials for Cd(Ⅱ)in Wastewater
This paper selected the rice husk biochar,sodium bentonite and natural diatomite for adsorption materi-als,and conducted a series of adsorption experiments.SEM and FTIR analysis were used to characterize the ad-sorption materials,and the adsorption kinetics and mechanism of the three adsorption materials on Cd(Ⅱ)in wastewater were studied.The results showed that the adsorption of Cd(Ⅱ)on the three adsorbents is in accord-ance with the pseudo second order kinetic model,and it is a physical-chemical complex process.The adsorption mechanism of biochar for Cd(Ⅱ)in solution is mainly the calcium oxide in the pores and oxygen-containing functional groups on the surface,while bentonite and diatomite mainly depend on the specific surface area,surface micropore and double bond functional groups.
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