Abstract
A modified chitosan-bentonite composite adsorbent has been prepared by loading chitosan using bentonite as a carrier, and the modified bentonite has been characterized by scanning electron microscope (SEM) analysis and thermogravimetric (TG) analysis. The prepared chitosan-bentonite is used to remove copper ions in aqueous solution. The effects of reaction time, pH value, initial concentration of copper ions and addition amount of bentonite-loaded chitosan adsorbent on the adsorption effect were investigated. In this experiment, the single-factor investigation of the adsorption of copper ions by this material showed that: when the mass ratio of chitosan and bentonite is 0.08: 1, the adsorption effect of copper ions is better when the time is 50min, pH=11 and the adsorption temperature is 20℃ the removal rate is higher, which can reach 95%. The material is green and environmentally friendly, which realizes the efficient use of chitosan and bentonite, and has certain utilization value for the removal of copper ions.
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