利用废泡沫餐盒、聚乙烯醇(PVA)和海藻酸钠(SA)固定化水葫芦粉末,制得新型生物吸附剂固定化水葫芦颗粒(PSPB)用于吸附水中Pb(Ⅱ)。结果表明:水温为20～40℃,pH为3—6时PSPB对Pb(Ⅱ)可获得理想吸附率,吸附率最高可达88%。吸附过程遵循准二级反应动力学,由快速吸附和慢速吸附两个阶段组成。Langmuir等温吸附模型能较好地描述吸附特征,吸附是自发进行的吸热反应。吸附机理主要是羟基和羧基与Pb(Ⅱ)发生离子交换和络合反应。PSPB机械强度大,循环使用3次后吸附率仍73%以上,具有较好的稳定性。
A novel biological adsorbent immobilized water hyacinth granular(PSPB) was successfully prepared by the fixed of water hyacinth powder with styrofoam fast food boxes、sodium alginate(SA)and poly(vinyl alcohol)(PVA),and applied to remove Pb(Ⅱ) from water.The results showed that the ideal adsorption rate of Pb(Ⅱ) by PSPB was obtained with water temperature of 20～40℃ and pH 3～6,the best adsorption efficiency was over 88%.The adsorption kinetics fit better with pseudo-second order kinetics and included the rapid stage and slow stage.The experimental isotherm data fit well in the Langmuir equations.The adsorption process is spontaneous endothermic reation.Ion exchange and the complex reaction between hydroxyl and carboxyl groups in PSPB with Pb(Ⅱ) were the main adsorption mechanisms.PSPB had high mechanical strength,and 73% of Pb(Ⅱ) was adsorbed by PSPB after 3 cycles,which indicated that PSPB had excellent stability.
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基金资助
国家自然科学基金(31570398);广东省协同创新与平台环境建设专项资金项目(2014A070713039)。
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