SORPTION ONTO AND RECOVERY OF CR(VI) USING IRON-OXIDE-COATED SAND
SORPTION ONTO AND RECOVERY OF CR(VI) USING IRON-OXIDE-COATED SAND
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DOI：
10.2166/wst.1992.0566
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发表时间：
1992-01-01
影响因子：
2.7
通讯作者：
BENJAMIN, MM
中科院分区：
文献类型：
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作者：
BAILEY, RP;BENNETT, T;BENJAMIN, MM
制备了一种新的吸附介质，它由涂在砂表面的氧化铁组成。氧化物涂层通过将铁盐和碱的溶液添加到砂的混合物中并应用各种加热方案来制备。氧化铁是一种优良的可再生吸附剂，将其涂覆在沙子上的过程允许介质用于填充柱中。根据溶液的pH值，介质可以吸附阳离子或阴离子金属。在这项工作中，该介质用于从合成废物流中收集六价铬。进水含20 mg/L的Cr（VI），并始终达到99%以上的去除率。一旦突破发生，培养基可以通过暴露于碱而再生。再生剂溶液的pH决定了再生过程的动力学和效率。随着进一步的发展，该工艺代表了从工业废物流中去除和回收金属的廉价而有效的方法。
A new adsorbent media has been prepared consisting of iron oxide coated onto sand surfaces. The oxide coating is made by adding a solution of a ferric salt and base to a mixture of sand and applying various heating protocols. The iron oxide is an excellent, regenerable adsorbent, and the process of coating it on sand allows the media to be used in a packed column. Depending on solution pH, the media can be made to adsorb either cationic or anionic metals. In this work, the media was used to collect hexavalent chromium from a synthetic waste stream. The influent contained 20 mg/L Cr(VI), and better than 99% removal was achieved consistently. Once breakthrough occurred, the media could be regenerated by exposure to base. The pH of the regenerant solution determined the kinetics and efficiency of the regeneration process. With further development, the process represents an inexpensive and effective method for removal and recovery of metals from industrial waste streams.