Batch and Column Study : Adsorption of Arsenate Using Untreated Laterite as Adsorbent
Batch and Column Study : Adsorption of Arsenate Using Untreated Laterite as Adsorbent
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批量和柱研究：使用未经处理的红土作为吸附剂吸附砷酸盐
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
S. De
中科院分区：
文献类型：
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作者：
Abhijit Maiti;S. Dasgupta;J. Basu;S. De
研究了天然红土（NL）对砷酸盐（As(V)）离子的吸附去除。在广泛的操作条件下进行了平衡和动力学研究，以评估NL从水中去除As(V)的有效性。在批量研究中，考察了吸附剂剂量、初始pH、溶液离子强度、初始砷酸盐浓度、温度和接触时间的影响。批量研究表明，在pH为5.5 ~ 7.5的范围内，砷酸盐的吸收是有效的。等温线数据与Langmuir等温线模型拟合良好，吸附量为0.565 mg g-1。砷酸盐在NL中的有效颗粒内扩散系数为7.4 ~ 9.4 × 10-10 cm2 s-1。用固定床进行了连续柱研究。采用Adams - Bohart模型预测柱体研究的突破曲线。
Removal of arsenate (As(V)) ions by adsorption on natural laterite (NL) is investigated in the present study. Both equilibrium and kinetic study over a wide range of operating conditions are tested to evaluate the effectiveness of NL to remove As(V) from water. In the batch study, the effects of adsorbent dose, initial pH, ionic strength of solution, initial arsenate concentration, temperature, and contact time are examined. Batch study reveals that the uptake of arsenate is effective in the pH range of 5.5 to 7.5. The isotherm data is fitted well in the Langmuir isotherm model, and adsorption capacity is found to be 0.565 mg g-1. The effective intraparticle diffusion coefficient of arsenate ions in NL is observed to be in the range of 7.4 to 9.4 × 10-10 cm2 s-1. Continuous column study using a fixed bed is also carried out. The Adams−Bohart model is applied for the predicting breakthrough curve for column study.