A water soluble thiourea-modified polyethylenimine copolymer was synthesized and utilized as a precious metal recovery material with high efficiency (16.0 mmolAu gpolymer−1). The recovery mechanism was clearly revealed, and the Au–S bond between thiourea and AuIII and the electrostatic interaction between amino groups and AuCl4− were involved.
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Li et al. (2014) studied this question.
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