聚合电解质负载磷酸钡复合微球对铅的吸附

Adsorption of Pb^(2+) in Aqueous Solution by Barium Phosphate Composite Microsphere Loaded on Polyelectrolyte

以卡拉胶(CN)、海藻酸钠(SA)和壳聚糖(CS)为基质包裹磷酸钡合成了CN-SA-CS@Ba P复合微球球形吸附剂,对其形貌特征进行了表征,研究了对含铅废水的净化效果,结果表明,CN-SA-CS@Ba P复合微球在p H为4~6时去除效果最好;随着水溶液中Pb^(2+)初始含量的增加,复合微球对铅的吸附量也随之增加,但是去除效率却逐渐降低;随着接触时间增加,复合微球的吸附量逐渐增大并在180 min左右达到吸附平衡。复合微球对Pb^(2+)的吸附平衡最符合Langmuir等温线模型,最大吸附量可达132.1 mg/g;复合微球对Pb^(2+)具有快的吸附速率,其吸附动力学遵循准2级反应动力学模型,这与其三维网络结构和大量功能性基团有关。

Carrageenan（CN）,sodium alginate（SA）and chitosan（CS）was used as matrix to immobilize barium phosphate（Ba P）for CN-SA-CS@Ba P composite microsphere preparation.The morphology feature of composite microsphere was characterized,and the purification effect of Pb^2＋containing wastewater was studied.The results showed that,Pb^2＋could be removed from water solution with high efficiency by CN-SA-CS@Ba P composite microsphere when p H was 4~6.And the adsorption capacity of Pb^2＋on composite microsphere increased with the increasing of Pb^2＋initial content in aqueous solution,but the removal efficiency decreased gradually.The composite microsphere adsorption capacity increased gradually with the increase of contact time,and the adsorption equilibrium could reach after 180 min.The adsorption equilibrium of Pb^2＋was well fitted to the Langmuir isotherm model,and the maximum adsorption capacity was 132.1 mg/g.CN-SA-CS@Ba P composite microsphere exhibited rapid adsorption rate,kinetic data was followed the pseudo-second-order model,which could be due to the three-dimensional network structure and a large number of functional groups.