Abstract：
In this study, ethylene diamine-coated reduced graphene oxide-supported silver composite (Ag/rGO-ED) was synthesized and used as an efficient catalyst for the decolorization of methylene blue (MB) in the presence of NaBH4. The morphology of the obtained material was elucidated using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The influences of four parameters (MB concentration (mg/L), NaBH4 amount (mM), catalyst amount (g/L), and contact time (s)) on the decolorization process were appraised and optimized via response surface methodology (RSM). For the decolorization of MB, the optimum solutions were obtained as Co of 32.49 mg/L, NaBH4 amount of 152.89 mM, catalyst amount of 0.83 g/L, and 101.39 s contact time with MB decolorization efficiency of 97.73%. MB, a pollutant in wastewater, was decolorized rapidly by Ag/rGO-ED with an efficiency of approximately 97%. The exploration of kinetics and thermodynamics was another major emphasis of the work. The activation energy (Ea) and rate constant (k) for the decolorization of MB were obtained as 37.9 kJ/mol and 0.0135 s-1, respectively. The obtained results show that the catalyst, a new composite material in the literature, is promising for decolorization of wastewater.
摘要：
在这项研究中,合成了乙二胺包覆的还原氧化石墨烯负载的银复合材料（Ag/rGO-ED），并将其用作在NaBH4存在下脱色亚甲基蓝（MB）的有效催化剂。使用场发射扫描电子显微镜（FE-SEM）阐明了所得材料的形态，傅里叶变换红外光谱(FTIR),能量色散X射线分析（EDX），透射电子显微镜（TEM），和X射线衍射(XRD)技术。四个参数的影响（MB浓度（mg/L），NaBH4量（mM），催化剂用量(g/L),和接触时间(s))对脱色过程进行了评价和优化，采用响应面法(RSM)。对于MB的脱色，获得的最佳溶液为32.49mg/L的Co，NaBH4量为152.89mM，催化剂用量为0.83g/L，接触时间101.39s，MB脱色效率为97.73%。MB,废水中的污染物，通过Ag/rGO-ED快速脱色,效率约为97%。动力学和热力学的探索是这项工作的另一个主要重点。MB脱色的活化能（Ea）和速率常数（k）分别为37.9kJ/mol和0.0135s-1。得到的结果表明,该催化剂,一种新的复合材料，有望用于废水的脱色。
