Enhancing Cr(VI) removal by regulating Fe/Al bimetal adsorption and reduction properties: kinetic and mechanistic studies Article Swipe

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Wenhao Wang , Wenhao Wang , Aijun Ge , Yuan Xu , Xuesong Yang , Shiying Feng , Ying Su , Weida Wang , Weida Wang , Liqun Xing , Xiujuan Hao , Wenhao Wang , Aijun Ge , Yuan Xu , Xuesong Yang , Shiying Feng , Ying Su , Weida Wang , Liqun Xing , Xiujuan Hao ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.2166/wst.2025.165

In the study, a novel Fe/Al bimetal with a high specific surface area and electron transfer capacity was synthesized through ball milling Fe and Al powder. Importantly, this synthesis process did not consume Al powder and did not generate by-products that required treatment. Compared with Fe or Al powder and the ball-milled Fe or Al powder, Fe/Al could rapidly remove Cr(VI) through adsorption–reduction under near-neutral conditions. Nevertheless, the removal efficiency of Cr(VI) by Fe/Al was influenced by the initial pH of the solution and dissolved oxygen (DO). Kinetic studies and adsorption isotherm analysis demonstrated that the pseudo-second-order adsorption kinetic model and the Freundlich model could better describe the Cr(VI) removal data, and the maximum removal amount of Cr(VI) was 6.25 mg/g. Furthermore, based on the characterization analysis of XPS, the adsorbed Cr(VI) was reduced to Cr(III). SEM-EDS analysis revealed that Cr mainly overlapped with the Fe elemental distribution on the surface of Fe/Al particles, suggesting that Fe was the main reaction site. Consequently, the results indicated that highly active Fe/Al could be prepared by solid–solid blending for pollutant removal, which provided technological concepts for the waste utilization of scrap iron and aluminum.

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Response Surface Methodology

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Bimetal Adsorption Chemistry Scrap Kinetic energy Chemical engineering Freundlich equation Oxygen Electron transfer Nuclear chemistry Inorganic chemistry Ball mill Metal Specific surface area Metallurgy Process (computing) Materials science Response surface methodology

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Type: article
Language: en
Landing Page: https://doi.org/10.2166/wst.2025.165
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DOI: https://doi.org/10.2166/wst.2025.165

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Title: Enhancing Cr(VI) removal by regulating Fe/Al bimetal adsorption and reduction properties: kinetic and mechanistic studies

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Language: en

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Publication year: 2025

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Publication date: 2025-11-10

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Authors: Wenhao Wang, Wenhao Wang, Aijun Ge, Yuan Xu, Xuesong Yang, Shiying Feng, Ying Su, Weida Wang, Weida Wang, Liqun Xing, Xiujuan Hao, Wenhao Wang, Aijun Ge, Yuan Xu, Xuesong Yang, Shiying Feng, Ying Su, Weida Wang, Liqun Xing, Xiujuan Hao

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Landing page: https://doi.org/10.2166/wst.2025.165

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Concepts: Bimetal, Adsorption, Chemistry, Scrap, Kinetic energy, Chemical engineering, Freundlich equation, Oxygen, Electron transfer, Nuclear chemistry, Inorganic chemistry, Ball mill, Metal, Specific surface area, Metallurgy, Process (computing), Materials science, Response surface methodology

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abstract_inverted_index.elemental	147
abstract_inverted_index.indicated	166
abstract_inverted_index.pollutant	178
abstract_inverted_index.synthesis	29
abstract_inverted_index.Freundlich	103
abstract_inverted_index.adsorption	91, 98
abstract_inverted_index.efficiency	70
abstract_inverted_index.influenced	76
abstract_inverted_index.overlapped	143
abstract_inverted_index.particles,	154
abstract_inverted_index.suggesting	155
abstract_inverted_index.treatment.	43
abstract_inverted_index.ball-milled	52
abstract_inverted_index.by-products	40
abstract_inverted_index.conditions.	66
abstract_inverted_index.synthesized	19
abstract_inverted_index.utilization	187
abstract_inverted_index.Furthermore,	122
abstract_inverted_index.Importantly,	27
abstract_inverted_index.demonstrated	94
abstract_inverted_index.distribution	148
abstract_inverted_index.near-neutral	65
abstract_inverted_index.Consequently,	163
abstract_inverted_index.Nevertheless,	67
abstract_inverted_index.solid–solid	175
abstract_inverted_index.technological	182
abstract_inverted_index.characterization	126
abstract_inverted_index.pseudo-second-order	97
abstract_inverted_index.adsorption–reduction	63
cited_by_percentile_year
countries_distinct_count	1
institutions_distinct_count	20
citation_normalized_percentile.value	0.70032599
citation_normalized_percentile.is_in_top_1_percent	False
citation_normalized_percentile.is_in_top_10_percent	False