微晶纤维素基碳酸钙复合材料对Cd^(2+)和Pb^(2+)的捕集与回收研究

Trapping and recovery of Pb^(2+) and Cd^(2+) by microcrystalline cellulose-based calcium carbonate composites

以微晶纤维素(MCC)和碳酸钙(CaCO_(3))为基底,通过冷却活化和离子交换反应制备了MCC@CaCO_(3)复合材料。研究捕集时间、浓度及pH等因素对溶液中Cd^(2+)和Pb^(2+)去除的影响。结果表明,当Ca^(2+)的投加量为0.1 mol、pH值为5时,MCC@CaCO_(3)对Cd^(2+)的吸附容量达503.47 mg/g,对Pb^(2+)的吸附容量达1 076.05 mg/g,去除率99.7%。

MCC@CaCO_(3) Composite material was prepared by cooling activation and ion exchange reaction using cellulose microcrystalline(MCC) and calcium carbonate(CaCO_(3)) as substrates.The effects of factors such as capture time,concentration,and pH on the removal of Cd^(2+ )and Pb^(2+) from the solution were studied.The results showed that when the amount of Ca^(2+) was 0.1 mol and the pH value was 5,the adsorption capacity of MCC@CaCO_(3) for Cd^(2+) could reach 503.47 mg/g,and that for Pb^(2+ )could reach 1 076.05 mg/g,and the removal rate could reach 99.7%.