Department of Civil Engineering, Maharaja Ranjit Singh Punjab Technical University, Bathinda, 151001, Punjab, India.
R & D Department, Institute of Sci-Tech Affairs, Mohali, 140301, Punjab, India.
Chemosphere. 2022 Jun;296:133966. doi: 10.1016/j.chemosphere.2022.133966. Epub 2022 Feb 21.
Industrial effluents generally contain several metals, so during adsorptive treatment, they may influence the removal of each other. It is essential to explore the effect of co-cations on metal removal in multi-metal solutions. The present study examined the possibility of processed rice husk and saw dust to remove Cr, Ni, Cu, Cd and Zn, from the single, binary and multi-component aqueous solutions. A substantial lesser removal of metal ions was observed in the presence of co-ions. This study revealed antagonistic effect on the removal of a particular metal ion, from the industrial effluent, even at optimum process parameters if other metal ions are present in the effluent. Although, a higher concentration of one metal ion than others in effluents increased its removal due to a greater number of ions as compared to other for the biosorption, yet presence of other ions influences the uptake of individual ions. In case of industrial effluents, maximum adsorption was obtained at pH 2.0 for Cr, 5.0 for Ni and Cd and 6.0 for Zn and Cu. The study confirms the beneficial use of the studied biosorbents in water remediation.
工业废水中通常含有多种金属，因此在吸附处理过程中，它们可能会相互影响。因此，探索共阳离子对多金属溶液中金属去除的影响是至关重要的。本研究考察了加工稻壳和锯末从单一、二元和多组分水溶液中去除 Cr、Ni、Cu、Cd 和 Zn 的可能性。在共离子存在的情况下，金属离子的去除量明显减少。本研究揭示了即使在最佳工艺参数下，如果废水中存在其他金属离子，也会对从工业废水中去除特定金属离子产生拮抗作用。尽管废水中一种金属离子的浓度高于其他金属离子，由于与其他离子相比，其离子数量更多，因此会增加其去除率，但其他离子的存在会影响单个离子的吸收。对于工业废水，Cr 的最大吸附在 pH 2.0 时达到，Ni 和 Cd 的最大吸附在 pH 5.0 时达到，Zn 和 Cu 的最大吸附在 pH 6.0 时达到。研究证实了所研究的生物吸附剂在水修复中的有益用途。
