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Enhanced simultaneous removal of Cr(VI) and Cd(II) from aqueous solution and soil: a novel carbon microsphere–calcium alginate supported sulfide-modified nZVI composite
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-26 , DOI: 10.1039/d2en00483f Weiyu Liang 1 , Yihao Shen 2 , Chen Xu 3 , Dongqing Cai 2 , Dongfang Wang 2 , Kailun Luo 1 , Xuechun Shao 1 , Zhihua Qiao 1 , Wei Zhang 1, 4 , Cheng Peng 1, 4
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-26 , DOI: 10.1039/d2en00483f Weiyu Liang 1 , Yihao Shen 2 , Chen Xu 3 , Dongqing Cai 2 , Dongfang Wang 2 , Kailun Luo 1 , Xuechun Shao 1 , Zhihua Qiao 1 , Wei Zhang 1, 4 , Cheng Peng 1, 4
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Industrial production activities commonly lead to excessive hexavalent chromium [Cr(VI)] and cadmium [Cd(II)] release to water and soil, which significantly endanger the ecological environment and human health. In this study, a novel calcium alginate doped with renewable biomass carbon microsphere-supported sulfide-modified nZVI bio-based ternary composite (S-nZVI@CMS@CA) was prepared to remove Cr(VI) and Cd(II) simultaneously in water and soil. The results revealed that CMS@CA greatly improved the stability and provided more active adsorption sites for heavy metals, and sulfide modification effectively enhanced the reactivity of nZVI. The adsorption capacities of Cr and Cd(II) were 2.913 mg g−1 and 4.527 mg g−1 after 1 h of reaction, respectively. Cations (Mg2+ and Ca2+) promoted the adsorption of Cr(VI) and Cd(II), while anions (H2PO4−, SO42−, and Cl−) and humic acid inhibited the adsorption. Meanwhile, the removal efficiencies of Cr and Cd(II) in natural lake water were higher than those in ultrapure water and tap water. SEM-EDS, FTIR and XPS analysis results showed that the mechanisms of Cr(VI) removal were redox and electron transfer under the combined action of iron–carbon microelectrolysis, and that of Cd(II) removal were chemical precipitation and surface complexation. The practicality of S-nZVI@CMS@CA was further verified by the remediation of Cr and Cd polymetallic contaminated soil. These results provide new insights into developing an effective solution for removing Cr and Cd simultaneously from water and soil.
中文翻译：
增强同时去除水溶液和土壤中的 Cr(VI) 和 Cd(II)：一种新型碳微球-海藻酸钙负载的硫化物改性 nZVI 复合材料
工业生产活动普遍导致过量的六价铬[Cr( VI )]和镉[Cd( II )]释放到水和土壤中，严重危害生态环境和人体健康。本研究制备了一种新型海藻酸钙掺杂可再生生物质碳微球负载硫化物改性的nZVI生物基三元复合材料（S-nZVI@CMS@CA），以同时去除水中的Cr( VI )和Cd( II )。和土壤。结果表明，CMS@CA大大提高了稳定性，为重金属提供了更多的活性吸附位点，硫化物改性有效提高了nZVI的反应性。Cr和Cd( II )的吸附量为2.913 mg g -1反应 1 小时后分别为4.527 mg g -1和 4.527 mg g -1 。阳离子(Mg 2+和Ca 2+ )促进了Cr( VI )和Cd( II )的吸附，而阴离子(H 2 PO 4 -、SO 4 2-和Cl - )和腐植酸抑制了吸附。同时，天然湖水中Cr和Cd( II )的去除效率高于超纯水和自来水。SEM-EDS、FTIR和XPS分析结果表明，Cr( VI )的去除机理是铁碳微电解联合作用下的氧化还原和电子转移，而Cd(II )去除是化学沉淀和表面络合。通过对Cr、Cd多金属污染土壤的修复进一步验证了S-nZVI@CMS@CA的实用性。这些结果为开发一种同时从水和土壤中去除 Cr 和 Cd 的有效解决方案提供了新的见解。
更新日期：2022-07-26
中文翻译：
增强同时去除水溶液和土壤中的 Cr(VI) 和 Cd(II)：一种新型碳微球-海藻酸钙负载的硫化物改性 nZVI 复合材料
工业生产活动普遍导致过量的六价铬[Cr( VI )]和镉[Cd( II )]释放到水和土壤中，严重危害生态环境和人体健康。本研究制备了一种新型海藻酸钙掺杂可再生生物质碳微球负载硫化物改性的nZVI生物基三元复合材料（S-nZVI@CMS@CA），以同时去除水中的Cr( VI )和Cd( II )。和土壤。结果表明，CMS@CA大大提高了稳定性，为重金属提供了更多的活性吸附位点，硫化物改性有效提高了nZVI的反应性。Cr和Cd( II )的吸附量为2.913 mg g -1反应 1 小时后分别为4.527 mg g -1和 4.527 mg g -1 。阳离子(Mg 2+和Ca 2+ )促进了Cr( VI )和Cd( II )的吸附，而阴离子(H 2 PO 4 -、SO 4 2-和Cl - )和腐植酸抑制了吸附。同时，天然湖水中Cr和Cd( II )的去除效率高于超纯水和自来水。SEM-EDS、FTIR和XPS分析结果表明，Cr( VI )的去除机理是铁碳微电解联合作用下的氧化还原和电子转移，而Cd(II )去除是化学沉淀和表面络合。通过对Cr、Cd多金属污染土壤的修复进一步验证了S-nZVI@CMS@CA的实用性。这些结果为开发一种同时从水和土壤中去除 Cr 和 Cd 的有效解决方案提供了新的见解。
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