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<p>Copper smelting wastewater containing some heavy metal ions (M), including Cu(II), Pb(II), Hg(II), Zn(II), Cd(II), Ca(II), etc., was treated by complexation-ultrafiltration (C-UF) using copolymer of acrylic-maleic acid (PMA) as complexant. Effects of pH and P/M (mass ratio of PMA to metal ions) were studied on the rejections of metal ions and the suitable conditions pH 7.0 and P/M 9 were obtained. Besides, the reaction kinetics between PMA and metals were investigated, and the reaction kinetics parameters were calculated. The stabilities of PMA-M complexes were studied in the shear field. The critical shear rates of PMA-M complexes, the smallest ones at which the PMA-M complexes begin to dissociate, in the sequence of PMA-Zn, PMA-Ca, PMA-Pb, PMA-Cd, PMA-Cu, PMA-Hg from small to large order, which was consistent with the results of the quantum chemical calculation. Further, the heavy metal ions were separated selectively according to the differences of PMA-M shear stabilities by shear induced orderly dissociation coupling with ultrafiltration (SIOD-UF), the selective separation factor <i>β</i><sub>Zn/Ca</sub>, <i>β</i><sub>Ca/Pb</sub>, <i>β</i><sub>Pb/Cd</sub>, <i>β</i><sub>Cd/Cu</sub> and <i>β</i><sub>Cu/Hg</sub> reached 88.5, 70.8, 48.2, 31.1 and 14.3, respectively.</p>

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Selective separation of heavy metal ions from copper smelting wastewater using SIOD-UF and the quantum chemical calculation

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Han Zhou,
  • Wenjing Tang,
  • Yuxin Chen,
  • Yunren Qiu

摘要

Copper smelting wastewater containing some heavy metal ions (M), including Cu(II), Pb(II), Hg(II), Zn(II), Cd(II), Ca(II), etc., was treated by complexation-ultrafiltration (C-UF) using copolymer of acrylic-maleic acid (PMA) as complexant. Effects of pH and P/M (mass ratio of PMA to metal ions) were studied on the rejections of metal ions and the suitable conditions pH 7.0 and P/M 9 were obtained. Besides, the reaction kinetics between PMA and metals were investigated, and the reaction kinetics parameters were calculated. The stabilities of PMA-M complexes were studied in the shear field. The critical shear rates of PMA-M complexes, the smallest ones at which the PMA-M complexes begin to dissociate, in the sequence of PMA-Zn, PMA-Ca, PMA-Pb, PMA-Cd, PMA-Cu, PMA-Hg from small to large order, which was consistent with the results of the quantum chemical calculation. Further, the heavy metal ions were separated selectively according to the differences of PMA-M shear stabilities by shear induced orderly dissociation coupling with ultrafiltration (SIOD-UF), the selective separation factor βZn/Ca, βCa/Pb, βPb/Cd, βCd/Cu and βCu/Hg reached 88.5, 70.8, 48.2, 31.1 and 14.3, respectively.