改性木屑对镉铬混合离子的吸附研究

Adsorption of Cd2+ and Cr3+ from Aqueous Mixed Metal Solutions by Modified Sawdust

以木屑为原料,经环氧氯丙烷交联,通过与丙烯酰胺接枝,制备出木屑丙烯酰胺接枝黄原酸盐(SCX-g-AM)。用SCX-g-AM处理Cd2+和Cr3+的混合模拟废水,在Cd2+和Cr3+浓度均为10 mg/L时,其最适宜的吸附条件为投加量3.33 g/L、pH=7、温度25℃、吸附时间30 min,此时Cd2+和Cr3+的去除率均达95%以上。试验结果能很好地符合准二级动力学模型。

A novel erosslinked cellulose - graft - polyacrylamide - co - magnesium xanthate （ SCX - g - AM ） was synthesized by grafting copolymerization reaction of cellulose, acrylamide, and xanthogenate using epichlorohydrin as erosslinking reagent in aqueous sodium hydroxide. The present study proposed the use of SCX - g - AM in the removal of Cd2 ＋ and Cr3 ＋ （initial concentration = 10 mg/L）from aqueous mixed metal solutions. Batch adsorption studies ware determined the optimum adsorption conditions ： adsorbent dosage is 3.33 g/L, pH value is 7, temperature is 25 ℃ and contact time is 30 min. Under these conditions, the removal of Cd2＋ ahd Cr3＋ get to above 95%. The results are in line with the normal scond-order kineties model.