Sulfide precipitation is an efficient method to remove Cu(II) and As(III) from strongly acidic wastewater, but the instantaneous release of H₂S from traditional sulfuration reagents causes serious H₂S pollution. Moreover, the obtained precipitates are mixtures of CuS and As₂S₃, leading to difficulties in resource recovery. In this study, a calcium sulfide-organosilicon complex (CaS-OSCS), in which CaS was coated into a matrix of {[O_1.5Si(CH₂)₃NH]CS}_n (OSCS) via the coordination bonding, was developed. OSCS, as a matrix of CaS-OSCS, can ensure the sustained and stable release of H₂S under strongly acidic conditions owing to its low swelling (1.75% swelling ratio) and excellent acid resistance. The release longevity of H₂S from CaS-OSCS extended from 5 min up to 50 min compared with that from CaS because the hydrophobic OSCS prevented solution diffusing to the pores of CaS-OSCS and thus slowed down the hydrolysis of CaS in pores. 99% of Cu(II)/As(III) was precipitated without H₂S escape, and the dosage of sulfuration reagents was reduced by 30%. In addition, CaS-OSCS improved the selective separation of copper from wastewater, and a separation factor between Cu(II) and As(III) reached 2376. This study provides a potential approach for the elimination of H₂S pollution and selective recovery of copper.

硫化物沉淀是去除强酸性废水中Cu(II)和As(III)的有效方法，但传统硫化剂中H ₂ S的瞬时释放会造成严重的H ₂ S污染。此外，所得沉淀物为CuS和As ₂ S _{3 的}混合物，导致资源回收困难。在这项研究中，开发了一种硫化钙 - 有机硅复合物（CaS-OSCS），其中通过配位键将 CaS 包覆到 {[O _1.5 Si(CH ₂ ) ₃ NH]CS} _n (OSCS)基质中. OSCS作为CaS-OSCS的基质，可以保证H ₂的持续稳定释放S 在强酸性条件下具有低溶胀性（1.75% 溶胀率）和优异的耐酸性。与CaS相比，CaS-OSCS中H ₂ S的释放寿命从5分钟延长至50分钟，因为疏水性OSCS阻止了溶液扩散到CaS-OSCS的孔中，从而减缓了孔中CaS的水解。Cu(II)/As(III)沉淀99%，H ₂ S不逸出，硫化试剂用量减少30%。此外，CaS-OSCS 提高了废水中铜的选择性分离，Cu(II) 和 As(III) 之间的分离系数达到了 2376。该研究为消除 H ₂ S 污染和选择性回收铜提供了一种潜在途径。铜。