Faculty of Engineering and Information Technology, University of Technology Sydney, Broadway, NSW 2007, Australia.
Faculty of Engineering and Information Technology, University of Technology Sydney, Broadway, NSW 2007, Australia.
J Hazard Mater. 2015 Apr 28;287:306-16. doi: 10.1016/j.jhazmat.2015.01.067. Epub 2015 Feb 2.
Heavy metals are serious pollutants in aquatic environments. A study was undertaken to remove Cu, Cd, Ni, Pb and Zn individually (single metal system) and together (mixed metals system) from water by adsorption onto a sodium titanate nanofibrous material. Langmuir adsorption capacities (mg/g) at 10(-3)M NaNO3 ionic strength in the single metal system were 60, 83, 115 and 149 for Ni, Zn, Cu, and Cd, respectively, at pH 6.5 and 250 for Pb at pH 4.0. In the mixed metals system they decreased at high metals concentrations. In column experiments with 4% titanate material and 96% granular activated carbon (w/w) mixture at pH 5.0, the metals breakthrough times and adsorption capacities (for both single and mixed metals systems) decreased in the order Pb>Cd, Cu>Zn>Ni within 266 bed volumes. The amounts adsorbed were up to 82 times higher depending on the metal in the granular activated carbon+titanate column than in the granular activated carbon column. The study showed that the titanate material has high potential for removing heavy metals from polluted water when used with granular activated carbon at a very low proportion in fixed-bed columns.
重金属是水生环境中的严重污染物。本研究采用钛酸钠纳米纤维材料，通过吸附作用从水中单独（单金属体系）和共同去除（混合金属体系）Cu、Cd、Ni、Pb 和 Zn。在 10(-3)M NaNO3 离子强度、pH6.5 和 250°C 下，单金属体系中 Ni、Zn、Cu 和 Cd 的 Langmuir 吸附容量（mg/g）分别为 60、83、115 和 149，在 pH4.0 和 250°C 下，Pb 的吸附容量为 250。在混合金属体系中，随着金属浓度的升高，吸附容量降低。在 pH5.0 条件下，以 4%钛酸盐材料和 96%颗粒状活性炭（w/w）混合物进行的柱实验中，金属穿透时间和吸附容量（单金属和混合金属体系）的顺序为 Pb>Cd、Cu>Zn>Ni，在 266 个床体积内。在颗粒状活性炭+钛酸盐柱中，取决于金属，吸附量比在颗粒状活性炭柱中高 82 倍。研究表明，当在固定床柱中以非常低的比例与颗粒状活性炭一起使用时，钛酸盐材料具有从受污染水中去除重金属的巨大潜力。
