{"title":"MIL-88（Fe）负载ZIF-8制备的分级多孔Fe3O4/Fe@C复合材料通过协同吸附和还原高效去除Cr（VI）","authors":"Dongyu Xie, Chenyu Zhou, Yingxue Wang, Mengxin Zhao, Xin Wang, Mei Wang, Xiaobin Zhou","doi":"10.1007/s11270-025-08463-4","DOIUrl":null,"url":null,"abstract":"<div><p>A novel hierarchical Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8 composite, which synergistically combined ZIF-8’s superior adsorption capacity with the redox reactivity of the Fe<sub>3</sub>O<sub>4</sub>/Fe@C core, was synthesized for Cr(VI) synergistic adsorption-reduction. The composite demonstrated remarkable Cr(VI) removal efficiency, achieving 94.27% elimination from aqueous solutions (initial concentration: 30 mg·L<sup>−1</sup>) under optimized conditions (dosage: 0.6 g·L<sup>−1</sup>, pH 4.0, 30 ℃). Kinetic and thermodynamic analyses revealed the adsorption process followed pseudo-second-order kinetics and Langmuir isotherm models, indicative of monolayer chemisorption with spontaneous and endothermic characteristics. Mechanistic investigations unveiled a synergistic remediation mechanism: the protonated nitrogen moieties within ZIF-8 enabled electrostatic capture of Cr(VI) oxyanions, which subsequently diffused through ZIF-8’s hierarchical pores to access the Fe<sub>3</sub>O<sub>4</sub>/Fe@C core; the adsorbed Cr(VI) ions were partially reduced to Cr(III) by Fe<sup>0</sup>, Fe<sup>2+</sup>, and C via intercomponent electron transfer, accompanied by the formation of Fe(III). Consequently, the resulting Cr(III) ions co-precipitated with Fe(III), forming amorphous hydroxide complexes that adhered to the surface of Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8, thereby effectuating the elimination of Cr species from the aqueous environment. Overall, the combination of adsorption, redox transformation, and magnetic separability positioned Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8 as a promising candidate for heavy metal remediation, providing new insights into MOF-based composite design for environmental applications.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 12","pages":""},"PeriodicalIF":3.0000,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Hierarchical Porous Fe3O4/Fe@C Composites Derived from MIL-88(Fe) Loaded with ZIF-8 for Efficient Cr(VI) Removal via Synergistic Adsorption and Reduction\",\"authors\":\"Dongyu Xie, Chenyu Zhou, Yingxue Wang, Mengxin Zhao, Xin Wang, Mei Wang, Xiaobin Zhou\",\"doi\":\"10.1007/s11270-025-08463-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A novel hierarchical Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8 composite, which synergistically combined ZIF-8’s superior adsorption capacity with the redox reactivity of the Fe<sub>3</sub>O<sub>4</sub>/Fe@C core, was synthesized for Cr(VI) synergistic adsorption-reduction. The composite demonstrated remarkable Cr(VI) removal efficiency, achieving 94.27% elimination from aqueous solutions (initial concentration: 30 mg·L<sup>−1</sup>) under optimized conditions (dosage: 0.6 g·L<sup>−1</sup>, pH 4.0, 30 ℃). Kinetic and thermodynamic analyses revealed the adsorption process followed pseudo-second-order kinetics and Langmuir isotherm models, indicative of monolayer chemisorption with spontaneous and endothermic characteristics. Mechanistic investigations unveiled a synergistic remediation mechanism: the protonated nitrogen moieties within ZIF-8 enabled electrostatic capture of Cr(VI) oxyanions, which subsequently diffused through ZIF-8’s hierarchical pores to access the Fe<sub>3</sub>O<sub>4</sub>/Fe@C core; the adsorbed Cr(VI) ions were partially reduced to Cr(III) by Fe<sup>0</sup>, Fe<sup>2+</sup>, and C via intercomponent electron transfer, accompanied by the formation of Fe(III). Consequently, the resulting Cr(III) ions co-precipitated with Fe(III), forming amorphous hydroxide complexes that adhered to the surface of Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8, thereby effectuating the elimination of Cr species from the aqueous environment. Overall, the combination of adsorption, redox transformation, and magnetic separability positioned Fe<sub>3</sub>O<sub>4</sub>/Fe@C@ZIF-8 as a promising candidate for heavy metal remediation, providing new insights into MOF-based composite design for environmental applications.</p><h3>Graphical Abstract</h3>\\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":808,\"journal\":{\"name\":\"Water, Air, & Soil Pollution\",\"volume\":\"236 12\",\"pages\":\"\"},\"PeriodicalIF\":3.0000,\"publicationDate\":\"2025-08-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Water, Air, & Soil Pollution\",\"FirstCategoryId\":\"6\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11270-025-08463-4\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water, Air, & Soil Pollution","FirstCategoryId":"6","ListUrlMain":"https://link.springer.com/article/10.1007/s11270-025-08463-4","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Hierarchical Porous Fe3O4/Fe@C Composites Derived from MIL-88(Fe) Loaded with ZIF-8 for Efficient Cr(VI) Removal via Synergistic Adsorption and Reduction
A novel hierarchical Fe3O4/Fe@C@ZIF-8 composite, which synergistically combined ZIF-8’s superior adsorption capacity with the redox reactivity of the Fe3O4/Fe@C core, was synthesized for Cr(VI) synergistic adsorption-reduction. The composite demonstrated remarkable Cr(VI) removal efficiency, achieving 94.27% elimination from aqueous solutions (initial concentration: 30 mg·L−1) under optimized conditions (dosage: 0.6 g·L−1, pH 4.0, 30 ℃). Kinetic and thermodynamic analyses revealed the adsorption process followed pseudo-second-order kinetics and Langmuir isotherm models, indicative of monolayer chemisorption with spontaneous and endothermic characteristics. Mechanistic investigations unveiled a synergistic remediation mechanism: the protonated nitrogen moieties within ZIF-8 enabled electrostatic capture of Cr(VI) oxyanions, which subsequently diffused through ZIF-8’s hierarchical pores to access the Fe3O4/Fe@C core; the adsorbed Cr(VI) ions were partially reduced to Cr(III) by Fe0, Fe2+, and C via intercomponent electron transfer, accompanied by the formation of Fe(III). Consequently, the resulting Cr(III) ions co-precipitated with Fe(III), forming amorphous hydroxide complexes that adhered to the surface of Fe3O4/Fe@C@ZIF-8, thereby effectuating the elimination of Cr species from the aqueous environment. Overall, the combination of adsorption, redox transformation, and magnetic separability positioned Fe3O4/Fe@C@ZIF-8 as a promising candidate for heavy metal remediation, providing new insights into MOF-based composite design for environmental applications.
期刊介绍：
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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