改性沸石和铁粉的复合材料处理水中六价铬的研究-中国环境.PDF

中国环境科学 2015,35(5) ：1384~1390 China Environmental Science 改性沸石和铁粉的复合材料处理水中六价铬的研究 杜珮雯,党宏钰,张永祥* (北京工业大学建筑工程学院,水质工程与水环境恢复工程北京市重点实验室,北京 100124) 摘要：利用海藻酸盐的凝胶化将零价铁粉固定于改性沸石表面,制得复合材 , 以期在保留改性沸石的吸附性的同时增加铁粉的还原性.复 合材料的扫描电镜图片可以看出铁粉分散嵌于海藻酸钙薄层, 同时海藻酸钙不会阻碍 Cr(VI)与改性沸石的接触.实验考察材料去除水中 Cr(VI)性能,结果表明:复合材 ,改性沸石,铁粉的除 Cr(VI)效率分别为:74.1%,38.4%,9.1%,这得益于改性沸石和铁粉相互的协同作用. 对反 应后复合材料进行 XPS 检测,其表面含有 Cr3+,Cr6+表明了材料吸附能力同时还具有还原性.并且对 Cr(VI)去除的现象能用伪二级吸附动力 学方程描述.平衡吸附量 qe 和反应速率常数 k 呈相反的变化趋势.铁粉含量为 5.4%的材料性能较好:qe 为 0.96mg/g, k 为 0.011g/(mg⋅h);在 Cr(VI)浓度为 70mg/L 时,上述铁含量的复合材料仍具有较高的处理性能,其 qe 和 k 分别为 1.29mg/g, 0.0094g/(mg⋅h). 关键词：改性沸石；零价铁；六价铬 中图分类号：X703.5 文献标识码：A 文章编号：1000-6923(2015)05-1384-07 Kinetic study for removal of soluble Cr(VI) by prepared surfactant-modified zeolites supported zero-valent iron * composite. DU Pei-wen, DANG Hong-yu, ZHANG Yong-xiang (College of Civil Engineering and Architecture, Beijing University of Technology, Beijing 100124, China), China Environment Science, 2015,35(5)：1384~1390 Abstract ：Based on the sol-gel transition property of sodium alginate, a kind of composite that: zero valent iron (ZVI) powder was immobilized on the surface of SMZ was prepared so that the composite would have both the adsorption capacity of SMZ and the reducibility of ZVI. The composite was scanned by scanning electron microscope, which indicated that iron powder was uniformly entrapped in a thin calcium-alginate film on the SMZ surface, besides the film did not impede the contact between Cr (VI) and SMZ. The batch experiments aimed to test the capability of removing soluble Cr (VI) by the composite and showed that: removal efficiency of composite, SMZ, ZVI was74.1%,38.4%,9.1%, respectively. The reacted composites was also scanned