利用马铃薯皮粉末作为低成本吸附剂从水溶液中去除 Cr(VI)。
Removal of Cr(VI) from Aqueous Solutions Using Powder of Potato Peelings as a Low Cost Sorbent.
机构信息
Department of Chemical Engineering, National University of Science and Technology, Bulawayo, Zimbabwe.
Department of Chemical Engineering, National University of Science and Technology, Bulawayo, Zimbabwe ; School of Engineering Sciences and Technology, Chinhoyi University of Technology, Private Bag Box 7724, Chinhoyi, Zimbabwe.
出版信息
Bioinorg Chem Appl. 2014;2014:973153. doi: 10.1155/2014/973153. Epub 2014 Jun 29.
Potato peels which are a low cost, renewable agroindustry by-product were used for the removal of hexavalent chromium from aqueous effluents. Batch experiments were carried out with an artificial effluent comprising of potassium dichromate in deionised water. The effects of the initial hexavalent chromium concentration, dose of biosorbent, and removal kinetics were explored. An adsorbent dosage of 4 g/L was effective in complete removal of the metal ion, at pH 2.5, in 48 minutes. The kinetic process of Cr(VI) adsorption onto potato peel powder was tested by applying pseudo-first-order and pseudo-second-order models as well as the Elovich kinetic equation to correlate the experimental data and to determine the kinetic parameters. The adsorption data were correlated by the Langmuir and Freundlich isotherms. A maximum monolayer adsorption capacity of 3.28 mg/g was calculated using the Langmuir adsorption isotherm, suggesting a functional group limited adsorption process. The results confirmed that potato peels are an effective biosorbent for the removal of hexavalent chromium from effluent.
马铃薯皮是一种低成本、可再生的农业副产品，可用于从废水中去除六价铬。本实验采用人工含重铬酸钾的去离子水废水进行批处理实验。考察了初始六价铬浓度、生物吸附剂用量和去除动力学的影响。在 pH 值为 2.5 时，吸附剂用量为 4 g/L 可在 48 分钟内有效去除金属离子。通过应用准一级和准二级模型以及 Elovich 动力学方程来关联实验数据并确定动力学参数，对 Cr(VI)吸附到马铃薯皮粉上的动力学过程进行了测试。吸附数据通过 Langmuir 和 Freundlich 等温线进行关联。使用 Langmuir 吸附等温线计算出最大单层吸附容量为 3.28 mg/g，表明这是一个功能基团限制吸附过程。结果证实，马铃薯皮是一种从废水中去除六价铬的有效生物吸附剂。
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