Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China.
J Hazard Mater. 2023 Jun 15;452:131183. doi: 10.1016/j.jhazmat.2023.131183. Epub 2023 Mar 14.
Cupric (Cu(II)) complexes in industrial wastewater are responsible for the failure of conventional alkaline precipitation, but the properties of cuprous (Cu(I)) complexes at alkaline circumstance have not been focused. This report proposed a novel strategy for the remediation of Cu(II)-complexed wastewater by coupling alkaline precipitation with green benign reductant, namely, hydroxylamine hydrochloride (HA). This remediation process (HA-OH) exhibits superior Cu removal efficiency that cannot be achieved with the same dosage of oxidants (3 mM). The possibility of Cu(I) activated O catalysis and self-decomplexation precipitation were investigated, and the results identified that O was generated from Cu(II)/Cu(I) cycle, but it was insufficient to annihilate organic ligands. Cu(I) self-decomplexation was the dominate mechanism of Cu removal. For real industrial wastewater, HA-OH process can realize the efficient CuO precipitation and Cu recovery. This novel strategy utilized intrinsic pollutant in wastewater without introducing other metals, complicated materials, and expensive equipment, broadening the insight for the remediation of Cu(II)-complexed wastewater.
工业废水中的铜（Cu(II)）配合物会导致传统碱性沉淀法失效，但碱性条件下一价铜（Cu(I)）配合物的性质尚未得到关注。本研究提出了一种通过耦合碱性沉淀与绿色良性还原剂羟胺盐酸盐（HA）来修复 Cu(II)配合废水的新策略。该修复工艺（HA-OH）具有优越的 Cu 去除效率，相同剂量的氧化剂（3 mM）无法达到。研究了 Cu(I)激活 O 催化和自去配合沉淀的可能性，结果表明 O 是由 Cu(II)/Cu(I)循环产生的，但不足以消灭有机配体。Cu(I)自去配合是 Cu 去除的主要机制。对于实际的工业废水，HA-OH 工艺可以实现高效的 CuO 沉淀和 Cu 回收。该新策略利用废水中固有的污染物，而不引入其他金属、复杂材料和昂贵设备，拓宽了对 Cu(II)配合废水修复的认识。
