羧甲基壳聚糖-膨润土复合吸附剂吸附重金属的试验研究

Experimental Study on the Adsorption of Heavy Metal by Carboxymethyl Chitosan-bentonite Compound Adsorbent

研究了羧甲基壳聚糖-膨润土复合吸附剂在不同参数下对Cu2+、Ni2+和Cr3+吸附的影响,分析比较了复合吸附剂在单组分和多组分溶液的吸附情况。结果表明,复合吸附剂对Ni2+的吸附可以很快达到吸附平衡,而对Cu2+和Cr3+的吸附分别在30 min和180 min时达到平衡;且pH对吸附容量的影响很显著。在多组分吸附体系中,单位复合吸附剂吸附的重金属离子的总毫摩尔数与单组分体系相比有所增加,但每种金属离子的吸附量与单组分体系相比均有下降。

Carboxymethyl chitosan-bentonite composite adsorbent was used to adsorb Cu2＋, Ni2＋ and Cr3＋ The influences of some adsorption parameters were investigated. And it compared that the adsorption of single component and the multicomponent solution by the composite adsorbent. The results showed that the adsorption equilibrium of Ni〉 achieved very fast, while 30 rain and 180 min were necessary for Cu2＋ and Cr3＋ to achieve equilibrium effect, respectively. The pH played an important role on the adsorption capacity. Composite adsorbents adsorb to multicomponent system, the total number of millimoles of compound adsorbent of heavy metal ions adsorbed increased than single components system, but each ion adsorption capacity decreased compared with single component system.