Lazaridis N K, Bakoyannakis D N, Deliyanni E A
Division of Chemical Technology, School of Chemistry, Aristotle University, Box 116, GR-54124 Thessaloniki, Greece.
Chemosphere. 2005 Jan;58(1):65-73. doi: 10.1016/j.chemosphere.2004.09.007.
In this study, akaganeite (beta-FeO(OH)) an ironoxyhydroxide material, was used as a low-cost potential adsorbent for the removal of hexavalent chromium from aqueous solutions. The influence of agitation speed, solution pH, initial chromium concentration, sorbent concentration and temperature were evaluated at batch kinetic runs. It was shown that the solid diffusion model, in comparison to simple reaction kinetic models, described better the sorption kinetics. Freundlich and Frumkin isotherm best fitted the equilibrium results. Akaganeite presented a sorption capacity approximately 80 mg Cr(VI) g(-1), under the conditions studied. Flotation was used as a downstream process for the effective removal of the loaded material.
在本研究中，赤铁矿（β-FeO(OH)），一种羟基氧化铁材料，被用作从水溶液中去除六价铬的低成本潜在吸附剂。在间歇动力学实验中评估了搅拌速度、溶液pH值、初始铬浓度、吸附剂浓度和温度的影响。结果表明，与简单反应动力学模型相比，固体扩散模型能更好地描述吸附动力学。Freundlich等温线和Frumkin等温线最符合平衡结果。在所研究的条件下，赤铁矿的吸附容量约为80 mg Cr(VI) g(-1)。浮选被用作有效去除负载材料的下游工艺。
