Sequestration of heavy metal ions from multi-metal simulated wastewater systems using processed agricultural biomass
2022
Bansal, Manjeet | Garg, Rajni | Garg, V.K. | Garg, Rishav | Singh, Diwan
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 Cr⁶⁺, Ni²⁺, Cu²⁺, Cd²⁺ and Zn²⁺, 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 Cr⁶⁺, 5.0 for Ni²⁺ and Cd²⁺ and 6.0 for Zn²⁺ and Cu²⁺. The study confirms the beneficial use of the studied biosorbents in water remediation.
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