【摘要】 通过胺化基体合成、黄原酸化改性两步法制备新型黄原酸基生物质凝胶CMC/PEI-SS，并考察其对强酸溶液中Pb(Ⅱ)的吸附特性与机制。CMC/PEI-SS为大孔网状结构，具有较大的比表面积和孔径以及优异的热稳定性。在pH=3.0的强酸溶液中，其对Pb(Ⅱ)的吸附量为0.49mmol/g，较胺化基体CMC/PEI提升了974.65%，表明黄原酸基是增强吸附性能的关键。CMC/PEI-SS在Pb(Ⅱ)-Zn(Ⅱ)双组份强酸溶液中的吸附亲和力顺序为Pb(Ⅱ)>Zn(Ⅱ)，分配系数、选择性系数分别较CMC/PEI提高了39.52倍、13.14倍。CMC/PEI-SS对Pb(Ⅱ)的选择性吸附是胺基、黄原酸基共同作用的结果，可形成更加稳定的多齿螯合配位，有利于抵抗质子以及其他阳离子的竞争干扰。应用CMC/PEI-SS动态吸附处理模拟酸性铅锌矿山废水，在1.1BV/h流速下，前91BV出水中Pb(Ⅱ)浓度低于0.5mg/L，表明其具有良好的应用潜力。更多还原

【Abstract】 A novel xanthane-based biomass gel CMC/PEI-SS, was prepared by a two-step method involving amination matrix synthesis and xanthanation modification. The adsorption properties and mechanisms of CMC/PEI-SS towards Pb(Ⅱ) in strong acid solutions were investigated. For Pb(Ⅱ) solution at pH=3.0, so high adsorption capacity as 0.49mmol/g was enhanced by 974.65% compared to the aminated matrix CMC/PEI, indicating the xanthate group as the key to enhance the adsorption performance. The order of adsorption affinity in Pb(Ⅱ)-Zn(Ⅱ) two-component system was Pb(Ⅱ)>Zn(Ⅱ), and the partition coefficient and selectivity coefficient were 39.52 times and 13.14 times higher than those of CMC/PEI,respectively. Both amine and xanthate groups contributed to the selective adsorption of Pb(Ⅱ) onto CMC/PEI-SS, because of the more stable multi-dentate chelating ligands which could facilitate the resistance to proton as well as the competition interference of other cation. Applying dynamic adsorption to treat simulated acidic Pb-Zn mine wastewater, Pb(Ⅱ)-concentration in the first 91BV effluent was less than 0.5mg/L at the flow rate of 1.1BV/h, which indicated the good potential of CMC/PEI-SS.更多还原