The problem of co-contaminated soil at e-waste dismantling sites is serious and constitutes a critical threat to human health and the ecological environment. Zero-valent iron (ZVI) has been proven to be effective in the stabilization of heavy metals and the removal of halogenated organic compounds (HOCs) from soils. However, for the remediation of co-contamination of heavy metals with HOCs, ZVI has disadvantages such as high remediation cost and inability to take into account both pollutants, which limits its large-scale application. In this paper, boric acid and commercial zero-valent iron (cZVI) were used as raw materials to prepare boric acid-modified zero-valent iron (B-ZVI bm ) through a high-energy ball milling strategy. B-ZVI bm coupled with persulfate (PS) to achieve simultaneous remediation of co-contaminated soil. The synergistic treatment of PS and B-ZVI bm resulted in the removal efficiency of 81.3% for decabromodiphenyl ether (BDE209) and the stabilization efficiencies of 96.5%, 99.8%, and 28.8% for Cu, Pb, and Cd respectively in the co-contaminated soil. A series of physical and chemical characterization methods showed that the oxide coat on the surface of B-ZVI bm could be replaced by borides during ball milling. The boride coat facilitated the exposure of the Fe 0 core, promoted the corrosion of ZVI and the orderly release of Fe 2+ . The analysis of the morphological transformation of heavy metals in soils revealed that most of the heavy metals in the exchangeable, carbonate-bound state were transformed into the residue state, which was the key mechanism for the remediation of heavy metal-contaminated soils with B-ZVI bm . The analysis of BDE209 degradation products showed that BDE209 was degraded to lower brominated products and further mineralized by ZVI reduction and free radical oxidation . In general, B-ZVI bm coupled with PS is a good recipe for synergistic remediation of co-contaminated soils with heavy metals and HOCs.
Yang Luo,Yan Song,Jiahui Ma,Jingzhi Yang,Dongxiang Chen,Hanjun Gong,Guo Liang Li
This study presents an intelligent polymer coating material with synergistic healing mechanisms that combine autonomous damage healing and inhibitor release, addressing critical challenges in metal corrosion protection. The synthesized polymer, composed of polythioctic acid incorporating cerium ions, selectively releases corrosion inhibitors and self-heals mechanical damage upon corrosion onset. The cerium ions serve dual roles as corrosion inhibitors and crosslinkers in the polythioctic acid matrix. The damaged coating nearly fully recovered its barrier properties within 12 h without external stimuli, achieving a healing efficiency of up to 94 % in 3.5 wt% NaCl solution. At the end of its service life, the coating could be recycled under mild conditions, achieving a monomer recovery efficiency of 82 %. This study offers a promising corrosion protection strategy that combines sustainability with high performance for harsh environmental applications.
The treatment of heavy metal(loid) (HM) composite pollution has long posed a challenge for the bioremediation of organohalide-contaminated sites. Given the prevalent cohabitation of sulfate-reducing bacteria (SRB) with organohalide-respiring bacteria (OHRB), we proposed a sulfate-amendment strategy to achieve synergistic remediation of trichloroethene and diverse HMs [50μM of As(III), Ni(II), Cu(II), Pb(II)]. Correspondingly, 50–75 μM sulfate was introduced to HM inhibitory batches to investigate the enhancement effect of sulfate amendment on bio-dechlorination. Dechlorination kinetics and MATLAB modeling indicated that sulfate amendment comprehensively improved the reductive dechlorination performance in the presence of As(III), Ni(II), Pb(II) and mixed HMs, while no enhancement was observed under Cu(II) exposure. Additionally, sulfate introduction effectively accelerated the detoxification of Ni(II), Pb(II), Cu(II), and As(III), achieving removal efficiencies of 76.87 %, 64.01 %, 86.37 %, and 95.50 % within the first three days, respectively. Meanwhile, propionate dynamics and acetogenesis indicated enhanced carbon source and e-donor supply. 16S rRNA gene sequencing and metagenomic analysis results demonstrated that HM sequestration was accomplished jointly by SRB and HM-resistant bacteria via extracellular precipitation (metal sulfide) and intracellular sequestration, while their contribution depended on the specific coexisting HM species present. This study highlights the critical role of sulfate in the concurrent bioremediation of HM-organohalide composite contamination and provides insights for developing a cost-effective in-situ bioremediation strategy.
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