A l -cysteine functionalized magnetic hollow MnFe ₂ O ₄ nanosphere material has been synthesised, with high magnetism, large interior cavities, and high porosity and surface activity. It has high adsorption efficiency and regenerated adsorption capacity for the removal of Cr ⁶⁺ and Pb ²⁺ in contaminated water.
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Jin et al. (2019) studied this question.
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