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Impact of adsorption pH for MPTAPs toward Hg2+ and other co-existing metal ions (a) and the adsorption prospect of MPTAPs toward Cu2+ and Pb2+ (b) (concentration of every kind of metal ion: 10 mg L−1; solution volume: 50 mL; mass of MPTAPs: 10 mg; adsorption time: 20 min).
