采用半胱氨酸对氧化石墨烯(GO)进行功能化改性,制备了半胱氨酸功能化还原氧化石墨烯(L-Cys-RGO)。用红外光谱、X射线衍射光谱等手段对其结构与性能进行表征。研究其对氨基黑染料的吸附行为,分别考察pH、吸附剂用量、染料浓度、吸附时间和温度等因素对吸附效果的影响。利用等温吸附模型与动力学模型对相应实验结果进行了分析。结果表明:半胱氨酸功能化还原GO对氨基黑有良好的吸附效果,去除率达到95%以上;30℃下的最大吸附容量为203.25mg/g,吸附过程符合Langmuir吸附等温模型,主要为单分子层吸附;吸附动力学表明该吸附过程符合伪二级动力学方程。
L-cysteine functionalized reduction of graphene oxide(L-Cys-RGO) was prepared by functional modification of graphene oxide(GO) with cysteine.Its structure and properties were characterized by infrared spectroscopy(FT-IR) and X-ray diffraction spectrum(XRD).The effects of pH,adsorbent dosage,dye concentration,contact time and temperature on the adsorption of amino black dyes were investigated.The isothermal adsorption model and kinetic model were used to analyze the experimental results.The results shown that L-Cys-RGO had a good adsorption effect for amino black,the removal efficiency was over 95% and the maximum adsorption capacity was 203.25mg/g.The adsorption of amino black conformed to Langmuir adsorption isotherm model,which was dominantly molecular layer adsorption.The adsorption kinetics shown that the adsorption process conformed to pseudo-second-order kinetic equation.
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