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- 2017
氧化石墨烯/SiO2复合材料对Cd（Ⅱ）的吸附
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Abstract:
以氧化石墨烯（GO）、正硅酸乙酯（TEOS）为原料，聚氧乙烯-聚氧丙烯-聚氧乙烯（P123）为表面活性剂，合成了GO/SiO2复合材料。通过静态吸附试验，探讨了pH、GO/SiO2投加量、吸附时间和Cd（Ⅱ）初始浓度对GO/SiO2吸附Cd（Ⅱ）的影响，采用了FTIR、XRD、SEM和EDS对GO/SiO2吸附Cd（Ⅱ）进行表征分析，并探讨了其对Cd（Ⅱ）的吸附机制。结果表明，当溶液pH为8.5，投加量为0.25 g/L，吸附时间为100 min时，GO/SiO2吸附Cd（Ⅱ）效果最佳。吸附过程较好的拟合了准二级动力学模型（R2 ≈1）和Freundlich等温吸附模型（R2 ≈1）。XRD表明SiO2与GO成功复合；FTIR、SEM等结果表明，GO/SiO2吸附Cd（Ⅱ）前后自身结构并未发生变化，其对Cd（Ⅱ）具有很好的吸附效果，对Cd（Ⅱ）的吸附机制以—OH、—COOH的离子交换作用为主，Si—OH的络合反应并存。 The graphene oxide/SiO2 composite (GO/SiO2) was fabricated using graphene oxide (GO), ethylsilicate (TEOS) as the raw material, oxygen polyoxyethylene-polypropylene-polyoxyethylene (P123) as the surfactant. Through a static test, different experimental parameters such as solution pH, dosing, adsorption time and initial concentration were examined to investigate their effects on adsorption of cadmium by GO/SiO2. The GO/SiO2 composite was investigated by FTIR, XRD, SEM and EDS. The experimental results show that the optimal pH, dosing, adsorption time is 8.5, 0.25 g/L, and 100 min, respectively. The equilibrium data fit well with the pseudo-second-order model(R2 ≈1) and Freundlich model(R2 ≈1). XRD indicate that SiO2 has been successfully combined with GO. FTIR and SEM indicate that GO/SiO2 structure itself keeps unchanged, and the GO/SiO2 has good adsorption effect on Cd(Ⅱ), in which ionexchange of —OH and —COOH play a major role, with the assistant of complexation reaction of Si—OH in the adsorption. 国家自然科学基金（11175081；11475080）；高等学校博士点基金（20134324110003）；2015湖南省研究生科研创新项目（CX2015B406）
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