Adsorption characteristics of S-Metolachlor onto the sawdust biochar derived from Acacia auriculiformis.

IF 1.4 4区农林科学 Q4 ENVIRONMENTAL SCIENCES

Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes Pub Date : 2024-01-01 Epub Date: 2024-03-04 DOI:10.1080/03601234.2024.2322767

Quach An Binh, Tran Van Khanh, Xuan Thanh Bui, Khanh Nguyen Di, Duy Toan Pham

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引用次数: 0

Abstract

The adsorption mechanism of S-Metolachlor in an aqueous solution by sawdust biochar derived from Acacia auriculiformis (SAB) was studied. SAB was manufactured at 500 °C for 4 h under oxygen-limited conditions and characterized for SEM, EDS, pHpzc, BET, and FTIR. The adsorption kinetics, isotherm, and diffusion studies of S-Metolachlor and SAB were further explored. Moreover, the effects of the solution pH were examined on the adsorption of S-Metolachlor by SAB. The BET analysis of SAB was achieved at 106.74 m².g^-¹ and the solution pH did not significantly influence the S-Metolachlor adsorption. The adsorption data were fitted into a Langmuir isotherm and the PSO model. The film diffusion coefficient D_f (4.93 × 10^-¹¹ to 8.17 × 10^-¹¹ m².s^-¹) and the particle diffusion coefficient D_p (1.68 × 10^-¹¹ to 2.65 × 10^-¹¹ m².s^-¹) were determined and the rate-limiting step of S-Metolachlor adsorption and SAB was governed by liquid film diffusion. The S-Metolachlor adsorption process onto SAB was controlled by multiple mechanisms, including pore filling, H-bonding, hydrophobic interaction, and π-π EDA interactions. H-bonding is the main interaction for the adsorption of S-Metolachlor and SAB. Conclusively, the study illustrates that biochar produced from Acacia auriculiformis sawdust possessed effective adsorption properties for S-Metolachlor herbicide.

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金合欢锯屑生物炭对 S-甲草胺的吸附特性。

研究了从金合欢（Acacia auriculiformis）中提取的锯末生物炭（SAB）对水溶液中 S-甲草胺的吸附机理。SAB 在限氧条件下于 500 °C 下制造 4 小时，并对其进行了 SEM、EDS、pHpzc、BET 和 FTIR 表征。进一步探讨了 S-Metolachlor 和 SAB 的吸附动力学、等温线和扩散研究。此外，还研究了溶液 pH 值对 SAB 吸附 S-Metolachlor 的影响。SAB 的 BET 分析值为 106.74 m2.g-1，而溶液的 pH 值对 S-Metolachlor 的吸附没有显著影响。吸附数据被拟合为 Langmuir 等温线和 PSO 模型。确定了液膜扩散系数 Df（4.93 × 10-11 至 8.17 × 10-11 m2.s-1）和微粒扩散系数 Dp（1.68 × 10-11 至 2.65 × 10-11 m2.s-1），S-甲草胺吸附和 SAB 的限速步骤受液膜扩散控制。Setolachlor 在 SAB 上的吸附过程受多种机制控制，包括孔隙填充、H 键、疏水作用和 π-π EDA 相互作用。H 键是吸附 S-Metolachlor 和 SAB 的主要相互作用。研究结果表明，用金合欢锯屑生产的生物炭具有有效吸附 S-Metolachlor 除草剂的特性。

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来源期刊

Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

4.00

自引率

5.00%

发文量

审稿时长

1 months

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