Absorption of copper ions from wastewater by organically modified bentonite

Ca-bentonite was modified firstly by Na2CO3 and then by octadecyl trimethyl ammonium chloride to prepare organically modified bentonite, and Ca-bentonite and organically modified bentonite were characterized by infrared spectroscopy and X-ray diffraction, respectively. The factors affecting the absorption of copper ions on organically modified bentonite were investigated by absorption experiments, and the absorption mechanism was discussed. The results showed that the absorption performance of organically modified bentonite for copper ions was improved. The 100 mL copper ion solution at a concentration of 10 mg L-1 was absorbed by organically modified bentonite, under the condition of initial solution pH of 4.00, absorbent dosage of 3.0 g L-1 and absorption time of 30 min, a removal rate of 98.40% was achieved at an absorption capacity of 3.28 mg g(-1). Quasi- second-order kinetic equation can well describe the reaction process of organically modified bentonite absorbing copper ions.