Nikzad Sadaf, Amooey Ali Akbar, Alinejad-Mir Ali
Department of Chemical Engineering, University of Mazandaran, Babolsar, Iran.
Environ Sci Pollut Res Int. 2021 Apr;28(16):20426-20439. doi: 10.1007/s11356-020-12238-1. Epub 2021 Jan 6.
Health and environmental impact of pesticide contamination of groundwater has been reported repeatedly in many studies. The removal of diazinon from agricultural wastewater is still of great interest due to using widely in many developing countries. In the presented study, the magnetic tragacanth-montmorillonite nanocomposite was utilized as an adsorbent to remove diazinon from an aqueous solution. The adsorbent properties were characterized using FE-SEM, EDX, FTIR, XRD, BET, and VSM techniques. The influence of adsorbent dosage, pH, contact time, and initial concentration of diazinon was studied in a batch system. Different adsorption kinetics and isotherm models were used to describe the kinetic and equilibrium data. The results indicated that the adsorption kinetic was fitted better with a Elovich kinetic model, and the adsorption isotherm was well described by the Langmuir-Freundlich model, and the maximum adsorption capacity was 416 mg g. According to Weber and Morris's model and Boyd plot, the results demonstrated that the adsorption kinetic was controlled simultaneously by film diffusion and intraparticle diffusion. Besides, a thermodynamic study showed that the removal of diazinon is an endothermic process. Considering the results, magnetic tragacanth-montmorillonite nanoadsorbent has a high capability to remove diazinon from aqueous solution.
许多研究反复报道了农药污染地下水对健康和环境的影响。由于在许多发展中国家广泛使用，从农业废水中去除二嗪农仍然备受关注。在本研究中，磁性黄蓍胶-蒙脱石纳米复合材料被用作吸附剂以从水溶液中去除二嗪农。使用场发射扫描电子显微镜（FE-SEM）、能量散射X射线谱（EDX）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、比表面积分析仪（BET）和振动样品磁强计（VSM）技术对吸附剂性能进行了表征。在间歇系统中研究了吸附剂用量、pH值、接触时间和二嗪农初始浓度的影响。使用不同的吸附动力学和等温线模型来描述动力学和平衡数据。结果表明，吸附动力学更符合埃洛维奇动力学模型，吸附等温线可用朗缪尔-弗伦德利希模型很好地描述，最大吸附容量为416 mg/g。根据韦伯和莫里斯模型以及博伊德图，结果表明吸附动力学同时受膜扩散和颗粒内扩散控制。此外，热力学研究表明二嗪农的去除是一个吸热过程。考虑到结果，磁性黄蓍胶-蒙脱石纳米吸附剂具有从水溶液中高效去除二嗪农的能力。
