This study describes the facile fabrication, characterization and applications of mesoporous reduced graphene oxide@zinc oxide (rGO@ZnO) composite for the adsorptive removal of the toxic organophosphorus pesticide chlorpyrifos (CPF) and catalytic oxidative degradation of the crystal violet (CV) dye from their respective aqueous solutions. The physical properties of the as-synthesized composite were evaluated by various state of the art techniques like powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. The adsorption efficacy of the rGO@ZnO composite was evaluated by conducting adsorption isotherm studies, kinetics studies and thermodynamic studies. The effect of solution pH, adsorbent dosage, solvent polarity, contact time and regeneration ability of the adsorbent on the adsorptive removal efficiency were also studied. Excellent removal efficiency of 95.4% was achieved within 70 min of contact time with the rGO@ZnO composite and more than 75% of the pesticide was adsorbed at the end of the fifth adsorption cycle. Batch adsorption results fitted well with the Freundlich adsorption isotherm with a high coefficient of determination (R²). The adsorption kinetics was best described by a pseudo-second-order model with an R² value of 0.93. Thermodynamic parameters corroborate the physisorption nature of the adsorption owing to the spontaneous and exothermic adsorption process. Pesticide contaminated water was used to determine the field applicability of the rGO@ZnO composite. The catalytic efficiency was evaluated by the oxidative dye degradation performance of rGO@ZnO based on the activation of oxone to produce sulfate radicals which degraded the CV dye within 30 min. Results indicate that mesoporous rGO@ZnO is an excellent candidate and possesses huge potential in water treatment.

这项研究描述了介孔还原型氧化石墨烯@氧化锌（rGO @ ZnO）复合材料的制备，表征和应用，该复合材料用于吸附去除有毒有机磷农药毒死rif（CPF）和催化氧化降解染料中的结晶紫（CV）染料。它们各自的水溶液。通过各种最新技术如粉末X射线衍射（PXRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和傅里叶变换红外（FT-IR）评估了合成后复合材料的物理性能。光谱学。通过进行吸附等温线研究，动力学研究和热力学研究来评估rGO @ ZnO复合材料的吸附效果。溶液pH值，吸附剂用量，溶剂极性，还研究了吸附剂的接触时间和再生能力对吸附去除效率的影响。在与rGO @ ZnO复合材料接触的70分钟内，达到了95.4％的优异去除效率，并且在第五次吸附循环结束时，超过75％的农药被吸附。批次吸附结果与Freundlich吸附等温线非常吻合，具有高测定系数（R ²）。吸附动力学最好用R ²值为0.93的拟二级模型来描述。由于自发的和放热的吸附过程，热力学参数证实了吸附的物理吸附性质。农药污染的水用于确定rGO @ ZnO复合材料的现场适用性。基于氧酮的活化产生的硫酸根基团，通过rGO @ ZnO的氧化染料降解性能来评估催化效率，从而在30分钟内降解CV染料。结果表明，介孔的rGO @ ZnO是一个很好的候选者，在水处理方面具有巨大的潜力。