Deliyanni Eleni A, Lazaridis Nikolaos K, Peleka Efrosini N, Matis Konstantinos A
Laboratory of General & Inorganic Chemical Technology, School of Chemistry, Aristotle University, GR-54124 Thessaloniki, Greece.
Environ Sci Pollut Res Int. 2004;11(1):18-21. doi: 10.1065/espr2003.08.168.
GOAL AND SCOPE AND BACKGROUND: The application of a promising method, termed sorptive flotation, for the removal of chromium(VI) and zinc ions was the aim of the present paper. A special case of sorptive flotation is adsorbing colloid flotation. Suitable sorbent preparation techniques have been developed in the laboratory.
Sorptive flotation, consisting of the sorption and flotation processes combined in series, has proved to give fast and satisfactory treatment of the industrial streams and effluents bearing dilute aqueous solutions of zinc and chromium(VI).
Goethite has proved to be effective for the removal of chromium(VI) and zinc ions. Also, adsorbing colloid flotation with ferric hydroxide (as the co-precipitant) could be an alternative method to the above-mentioned separation of metal ions. In both cases, chromium(VI) (pH=4) and zinc (pH=7) removal was about 100%.
The reasons for selecting the iron-based bonding materials, like goethite and/or in-situ produced ferric hydroxide, are that they are cheap, easily synthesized, suitable both for cation and anion sorption, and, furthermore, that they present low risks for adding a further pollutant to the system. Promising results were obtained.
The application of goethite and in-situ produced ferric hydroxide has demonstrated their effectiveness in the removal of heavy metal ions, such as chromium anions and zinc cations. A proposed continuation of current work is the utilization of similar iron oxides, for instance synthesized akaganeite. The comparison between the results reported in this paper with the results reported in the literature, also deserves attention.
目标、范围及背景：本文旨在应用一种名为吸附浮选的有前景的方法去除六价铬和锌离子。吸附浮选的一种特殊情况是吸附胶体浮选。实验室已开发出合适的吸附剂制备技术。
吸附浮选由吸附和浮选过程串联组成，已证明能快速且令人满意地处理含锌和六价铬稀水溶液的工业废水和污水。
针铁矿已被证明对去除六价铬和锌离子有效。此外，以氢氧化铁（作为共沉淀剂）进行吸附胶体浮选可能是上述金属离子分离的替代方法。在这两种情况下，六价铬（pH = 4）和锌（pH = 7）的去除率约为100%。
选择针铁矿和/或原位生成的氢氧化铁等铁基键合材料的原因是它们价格便宜、易于合成，既适合阳离子吸附也适合阴离子吸附，而且向系统中添加进一步污染物的风险较低。获得了有前景的结果。
针铁矿和原位生成的氢氧化铁的应用已证明它们在去除重金属离子（如铬阴离子和锌阳离子）方面的有效性。当前工作的一个建议延续方向是利用类似的铁氧化物，例如合成的羟铁矿。本文报道的结果与文献报道结果的比较也值得关注。
