Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+.
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| Title: | Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+. |
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| Authors: | Wang, Lu-Si1 (AUTHOR), Wang, Yi-Rong1 (AUTHOR), Liao, Xiao-Yong2 (AUTHOR), Tang, Kuok Ho Daniel3,4 (AUTHOR), Li, You1,2 (AUTHOR) liyou@igsnrr.ac.cn, Shaheen, Sabry M.5 (AUTHOR), Li, Rong-Hua1,4 (AUTHOR) rh.lee@nwsuaf.edu.cn |
| Source: | Colloids & Surfaces A: Physicochemical & Engineering Aspects. Sep2026, Vol. 744, pN.PAG-N.PAG. 1p. |
| Subjects: | Arsenic removal (Groundwater purification), Biochar, Arsenic poisoning, Environmental remediation, Water purification, Soil remediation, Adsorption (Chemistry), Sorbents |
| Abstract: | Developing a low-cost, highly efficient remediation biosorbent for arsenic (As5+ and As3+) is essential for protecting environments and using biomass resource. In this study, ZnCr-LDH- tailored sawdust biochar composites (ZnCr-LDH/BC) were synthesized and used as adsorbents for decontamination of arsenic -contaminated water and soil. ZnCr-LDH tailoring improved arsenic adsorption efficiency, especially for flower-like ZnCr-LDH/BC with a 4:1 molar ratio of Zn to Cr (4:1 ZnCr-LDH/BC). This formulation outperformed other adsorbents, including unmodified biochar. As5+ and As3+ adsorption processes are better simulated by the pseudo-second-order kinetic model and Sips model. At pH 7, 4:1 ZnCr-LDH/BC adsorbed up to 67.45 mg/g of As5+, and at pH 9, 24.55 mg/g of As3+. Ionic strength and co-existing ions exerted no significant inhibitory effects on As³ ⁺, but they hindered the adsorption of As⁵⁺. Besides ion exchange and complexation, electrostatic attraction also contributes to As⁵⁺ removal, but this mechanism is absent for As3+. Additionally, the practicality of composite was confirmed through its application in treating natural water and arsenic-contaminated industrial wastewater, as well as its column experiment performance and economic benefit evaluation. The addition of 4:1 ZnCr-LDH/BC reduced the DTPA-extractable content and leaching toxicity of As5+ and As3+in soil. The addition of 4:1 ZnCr-LDH/BC could alleviate the stress of arsenic on microorganisms, increase the wheat seedling biomass, and decrease the arsenic accumulation in the above-ground parts of plant. This study prepared and confirmed that 4:1 ZnCr-LDH/BC is a highly efficient adsorbent for As5+ and As3+. It can remediate arsenic-contaminated water bodies and soil in practice. [Display omitted] • 67.45 mg/g of As5+ and 24.55 mg/g of As3+ adsorbed by 4:1 ZnCr-LDH/BC. • As5+ adsorption occurred via ion exchange, electrostatic attraction and complexation. • As3+ adsorption occurred via ion exchange and ligand-exchange-induced complexation. • Composite increased soil As-tolerant flora richness and decreased plant As uptake. • ZnCr-LDH/BC is effective for treating arsenic-contaminated wastewater and soil. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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