Process development for the removal of lead and chromium from aqueous solutions using red mud - an aluminium industry waste
Process development for the removal of lead and chromium from aqueous solutions using red mud - an aluminium industry waste
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DOI：
10.1016/s0043-1354(00)00389-4
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发表时间：
2001-04-01
期刊：
影响因子：
12.8
通讯作者：
Sharma, S
中科院分区：
文献类型：
--
作者：
Gupta, VK;Gupta, M;Sharma, S
赤泥是一种铝工业废弃物，已被转化为一种廉价而高效的吸附剂，用于脱除水溶液中的铅和铬。各种因素(如pH、吸附剂用量、吸附浓度、温度、粒径等)对水中金属离子去除的影响。已经进行了研究和讨论。研究了其他金属离子/表面活性剂的存在对Pb2+和Cr6+去除的影响。该材料具有良好的吸附性能，符合Freundlich和Langmuir模型。热力学参数表明了该工艺的可行性。对吸附机理进行了动力学研究。对赤泥中铅和铬的去除进行了动力学模拟，发现其符合一级动力学。并对最佳脱除条件下的速率常数和传质系数进行了估算，以了解其脱除机理。已经进行了柱研究，以将这些与间歇能力进行比较。还尝试了Pb2+、Cr6+的回收和废塔的化学再生。(C)2001爱思唯尔科学有限公司。保留所有权利。
Red mud, an aluminium industry waste, has been converted into an inexpensive and efficient adsorbent and used for the removal of lead and chromium from aqueous solutions. Effect of various factors on the removal of these metal ions from water (e.g. pH, adsorbent dose, adsorbate concentration, temperature, particle size, etc.) has been studied and discussed. The effect of presence of other metal ions/ surfactants on the removal of Pb2+ and Cr6+ has also been studied. The material exhibits good adsorption capacity and the data follow both Freundlich and Langmuir models. Thermodynamic parameters indicate the feasibility of the process. Kinetic studies have been performed to understand the mechanism of adsorption. Dynamic modelling of lead and chromium removal on red mud has been undertaken and found to follow first-order kinetics. The rate constant and mass transfer coefficient have also been evaluated under optimum conditions of removal in order to understand the mechanism. Column studies have been carried out to compare these with batch capacities. The recovery of Pb2+ and Cr6+ and chemical regenertion of the spent column have also been tried. (C) 2001 Elsevier Science Ltd. All rights reserved.