Kinetic Modeling for Removal of Pb, Cd, Ni, and Cr Ions from Petrochemical Effluent using Termite Soil
Kinetic Modeling for Removal of Pb, Cd, Ni, and Cr Ions from Petrochemical Effluent using Termite Soil
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DOI：
10.18483/ijsci.950
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
I. Agbozu
中科院分区：
文献类型：
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作者：
I. Agbozu
我国水体中重金属离子浓度的增加令人十分关注。本研究旨在为石油化工废水中铅、镍、铬和镉的脱除提供一种环保、经济的吸附剂。通过对白蚁土进行预处理，改变吸附剂的接触时间和粒径等工艺参数进行吸附。在不同粒径的吸附剂中，Pb、Cd离子的最佳接触时间为60 min， Ni、Cr离子的最佳接触时间为40 min。初始反应速率H（mg/g）。对于不同粒径的吸附剂，75mm: Pb>Cd>Cr>Ni, 212mm: Cd>Pb>Cr>Ni, 300mm: Cd>Pb>Ni>Cr。实验吸附量与理论吸附量（Qa - Qb）之间的拟一级动力学差异较小，R2接近拟二级动力学。因此，它被认为是吸附过程的动力学级。实验结果表明，该吸附剂对工业废水中重金属离子的吸附效果良好。
Increase in concentration of heavy metals ions in our water bodies is of great concern. This work is aimed at providing an environmental and cost effective adsorbent for the removal of Pb, Ni, Cr and Cd from petrochemical effluent. Termite soil was pretreated and used for the sorption process and process parameters such as contact time and particle size of the adsorbent was varied. Optimum contact time of 60 minutes was obtained for Pb and Cd ions while 40 minutes was obtained for Ni and Cr ions for all particle sizes of adsorbent used. Initial reaction rate H(mg/g.min) was of the order for the different particle sized adsorbent, 75mm: Pb>Cd>Cr>Ni, 212mm: Cd>Pb>Cr>Ni and 300mm: Cd>Pb>Ni>Cr. Pseudo first order kinetics had less difference between experimental and theoretical adsorption capacity (Qa - Qb) with R2 close to that obtained for Pseudo-second order kinetics. Hence it is considered as the kinetic order for the adsorption process. Percentage of the studied ions removed from the wastewater solution shows the suitability of the adsorbent sequestering of heavy metal ions from industrial wastewater.