College of Science, China Agricultural University, Beijing, China.
Water Environ Res. 2024 Sep;96(9):e11124. doi: 10.1002/wer.11124.
This research exploited biochar, sourced from Ginkgo leaves (GLs), to facilitate the adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous environments. The results reveal that GL biochar, activated with ZnCl at a temperature of 500°C (500-ZGBC), demonstrated the greatest specific surface area (S) of 536.0 m g for 2,4-D adsorption. The biochar's properties, including specific surface area, morphology, structure, thermal stability, and functional groups, were analyzed. Additionally, studies of kinetic and isotherm profiles were conducted, yielding the highest recorded adsorption capacity of 281.8 mg g. Pore filling, hydrogen bonding, π-π interactions, surface complexation with Zn groups, and electrostatic interactions contribute significantly to the adsorption performance of 500-ZGBC for 2,4-D. Optimal adsorption was determined to occur at pH 2.117, with a dose of 0.4230 g L of 500-ZGBC, and an initial concentration of 2,4-D at 294.7 mg L, as evidenced by the application of the response surface method (RSM). PRACTITIONER POINTS: Premium pharmaceutical-grade biochar, derived from Ginkgo leaves, boasting a S of 536.0 m g was produced. An absorption capacity reaching 281.8 mg g was observed in Ginkgo leaf biochar for 2,4-dichlorophenoxyacetic acid (2,4-D) adsorption. The adsorption procedure was refined through the employment of response surface methodology.
这项研究利用银杏叶来源的生物炭（GLBC）来促进 2,4-二氯苯氧乙酸（2,4-D）在水相环境中的吸附。结果表明，在 500°C 下用 ZnCl2 活化的 GL 生物炭（500-ZGBC）具有最大的比表面积（S），达到 536.0 m²/g，对 2,4-D 的吸附效果最佳。研究分析了生物炭的特性，包括比表面积、形态、结构、热稳定性和官能团。此外，还进行了动力学和等温线的研究，得出了 281.8 mg/g 的最高吸附容量记录。孔填充、氢键、π-π 相互作用、Zn 基团表面络合和静电相互作用对 500-ZGBC 吸附 2,4-D 的性能有重要贡献。通过响应面法（RSM）的应用，确定了最佳吸附条件为 pH 值 2.117，500-ZGBC 的用量为 0.4230 g/L，2,4-D 的初始浓度为 294.7 mg/L。
利用银杏叶制备出一种具有 536.0 m²/g 比表面积的优质医药级生物炭。
银杏叶生物炭对 2,4-二氯苯氧乙酸（2,4-D）的吸附容量高达 281.8 mg/g。
通过响应面法（RSM）优化了吸附过程。
