Cr(vi), Pb(ii), Cd(ii) adsorption properties of nanostructured BiOBr microspheres and their application in a continuous filtering removal device for heavy metal ions
Cr(vi), Pb(ii), Cd(ii) adsorption properties of nanostructured BiOBr microspheres and their application in a continuous filtering removal device for heavy metal ions
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DOI：
10.1039/c3ta14519k
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发表时间：
2014-01
影响因子：
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通讯作者：
Xingqi Wang;Wenxia Liu;Jian Tian;Zhenhuan Zhao;P. Hao;X. Kang;Y. Sang;Hong Liu
中科院分区：
文献类型：
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作者：
Xingqi Wang;Wenxia Liu;Jian Tian;Zhenhuan Zhao;P. Hao;X. Kang;Y. Sang;Hong Liu
在十六烷基三甲基溴化铵（CTAB）和乙二醇（EG）存在下，通过简单的水热法制备了均匀、规整的BiOBr纳米微球。重金属离子吸附在合成的纳米结构的BiOBr微球进行了系统的评估，通过测量在吸附过程中使用的Cr（VI）浓度的比色法，镉（II）和铅（II）浓度的提取比色法的残留浓度。纳米结构的BiOBr微球对重金属离子（Cr、Cd、Pb）表现出良好的去除能力，对低浓度重金属离子表现出优异的吸附性能，在水净化方面具有潜在的应用前景。基于纳米结构BiOBr微球对重金属离子的快速高效去除能力，设计并构建了连续过滤式净水装置。在使用这种连续过滤式水净化装置时，1g吸附剂可以净化初始浓度为200 μg L-1的约4900 g Pb（II）污染水、5900 g Cd（II）污染水或21500 g Cr（VI）污染水，以成功地达到世界卫生组织的饮用水标准。该纳米结构具有较大的比表面积，对重金属离子具有较强的吸附能力，因此对重金属离子具有较好的去除效果。
Uniform well-defined nanostructured BiOBr microspheres have been fabricated via a simple hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB) and ethylene glycol (EG). The heavy metal ion adsorption on the as-synthesized nanostructured BiOBr microspheres was systematically assessed by measuring the residual concentration during the adsorption process using a colorimetric method for Cr(VI) concentration, and an extraction-colorimetric method for Cd(II) and Pb(II) concentrations. The nanostructured BiOBr microspheres showed good removal capacity for heavy metal ions (Cr, Cd, Pb), and excellent adsorption properties for low concentration heavy metal ions, indicating potential applications in water purification. Based on the quick and efficient heavy metal ion removal ability of nanostructured BiOBr microspheres, a continuous filtering-type water purification device was designed and constructed. In using this continuous filtering type water purification device, 1 g of adsorbent can purify about 4900 g of Pb(II) contaminated water, 5900 g of Cd(II) contaminated water, or 21 500 g of Cr(VI) contaminated water having initial concentrations of 200 μg L−1 to successfully attain the World Health Organization standard for drinking water. The good removal capacity can be attributed to the hierarchical nanostructure, which displays a large specific surface area and strong adsorption of heavy metal ions.