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中文摘要：
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/SiO_2复合材料。通过静态吸附试验,探讨了pH、GO/SiO_2投加量、吸附时间和Cd（Ⅱ）初始浓度对GO/SiO_2吸附Cd（Ⅱ）的影响,采用了FTIR、XRD、SEM和EDS对GO/SiO_2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0.25g/L,吸附时间为100min时,GO/SiO_2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（R~2≈1）和Freundlich等温吸附模型（R~2≈1）。XRD表明SiO_2与GO成功复合;FTIR、SEM等结果表明,GO/SiO_2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。
英文摘要：
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 com- posite was investigated by FTIR, XRD, SEM and EDS. The experimental results show that the optimal pH, do- sing, 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.
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