用于从水溶液中去除草甘膦的粘土-生物炭复合材料的合成
Synthesis of clay-biochar composite for glyphosate removal from aqueous solution.
作者信息
Rallet Danga, Paltahe Abba, Tsamo Cornelius, Loura Benoît
机构信息
Department of Chemistry, Faculty of Sciences, University of Maroua, P. O. Box 814, Maroua, Cameroon.
Department of Chemistry, Higher Teachers' Training College, University of Maroua, P. O. Box 55, Maroua, Cameroon.
出版信息
Heliyon. 2022 Mar 12;8(3):e09112. doi: 10.1016/j.heliyon.2022.e09112. eCollection 2022 Mar.
In this work, Clay-Biochar composite was synthesized from local Clay and local cotton wood, and applied for removal of glyphosate from aqueous solutions by adsorption. The Clay, Biochar and Clay-Biochar composite were characterized using X-ray diffraction, scanning electron microscope, fourier transform infrared spectroscopy, and thermal analysis. The adsorption studies of glyphosate were investigated by batch process at laboratory temperature. Adsorption experiments showed that the composite exhibited much better adsorption capability than both Clay and Biochar. The adsorption kinetics of glyphosate obeyed pseudo-second-order model according to their high coefficient R = 0.996, 0.995, 0.999 for Clay, Biochar and Clay-Biochar composite, respectively. The equilibrium adsorption data was best described by Langmuir model with R values of 0.937, 0.989, and 0.993 and Temkin model with R values of 0.982, 0.909, and 0.983, each for Clay, Biochar and Clay-Biochar respectively. Therefore, Clay-Biochar composite could be applied in the remediation of glyphosate in contaminated aqueous media.
在本研究中，采用当地的黏土和当地的棉木合成了黏土-生物炭复合材料，并将其用于通过吸附作用去除水溶液中的草甘膦。使用X射线衍射、扫描电子显微镜、傅里叶变换红外光谱和热分析对黏土、生物炭和黏土-生物炭复合材料进行了表征。在实验室温度下通过分批法研究了草甘膦的吸附性能。吸附实验表明，该复合材料的吸附能力比黏土和生物炭都要好得多。根据黏土、生物炭和黏土-生物炭复合材料的高系数R分别为0.996、0.995、0.999，草甘膦的吸附动力学符合准二级模型。平衡吸附数据分别用Langmuir模型（黏土、生物炭和黏土-生物炭的R值分别为0.937、0.989和0.993）和Temkin模型（黏土、生物炭和黏土-生物炭的R值分别为0.982、0.909和0.983）进行了最佳描述。因此，黏土-生物炭复合材料可用于修复受污染水介质中的草甘膦。
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