POPs Research Center, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2010 Jul 15;179(1-3):1014-21. doi: 10.1016/j.jhazmat.2010.03.106. Epub 2010 Mar 31.
Different metal doped TiO(2) adsorbents were prepared through the precipitation and hydrolysis-precipitation methods. The novel Ce-Ti oxide adsorbent obtained by the hydrolysis-precipitation had much higher sorption capacity for As(V) than both the pure titanium dioxide and cerium oxide adsorbents, and the preparation conditions including the Ti/Ce molar ratio and polyvinyl alcohol (PVA) content were optimized. Environmental scanning electronic microscopy (ESEM) and X-ray diffraction (XRD) spectroscopic investigations revealed that the amorphous Ce-Ti hybrid adsorbent was composed of some nanoparticles in the size range of 100-200 nm, which aggregated to form the porous hybrid adsorbents, and the amorphous compositions and the small nanoparticles were related to the high sorption capacity for As(V). Batch sorption experiments including sorption kinetics, isotherm, effect of pH and competitive ions were investigated. The Ce-Ti adsorbent exhibited high sorption capacity for As(V) at pH below 7. Column studies showed that about 72,085 bed volumes of As(V) solution at the concentration of 50 microg L(-1) and pH 6.5 were filtered when As(V) concentration in the effluent increased to 10 microg L(-1), and the average sorption capacity of As(V) on the Ce-Ti adsorbent was about 9.4 mg g(-1).
不同金属掺杂的 TiO(2)吸附剂通过沉淀和水解沉淀法制备。通过水解沉淀法获得的新型 Ce-Ti 氧化物吸附剂对 As(V)的吸附容量比纯二氧化钛和氧化铈吸附剂都要高得多，并且优化了包括 Ti/Ce 摩尔比和聚乙烯醇（PVA）含量在内的制备条件。环境扫描电子显微镜（ESEM）和 X 射线衍射（XRD）光谱研究表明，无定形的 Ce-Ti 杂化吸附剂由一些大小在 100-200nm 范围内的纳米粒子组成，这些纳米粒子聚集形成多孔杂化吸附剂，无定形组成和小纳米粒子与高吸附容量有关As(V)。进行了包括吸附动力学、等温线、pH 值和竞争离子影响在内的批量吸附实验。Ce-Ti 吸附剂在 pH 值低于 7 的条件下对 As(V)表现出高吸附容量。柱研究表明，当流出液中 As(V)浓度增加到 10μg/L 时，在 pH 值为 6.5 时浓度为 50μg/L 的 As(V)溶液约可过滤 72085 个床体积，Ce-Ti 吸附剂对 As(V)的平均吸附容量约为 9.4mg/g。
