摘要
以氧化石墨烯(GO)、膨润土(Bent)、十六烷基三甲基溴化铵(CTAB)为原料,合成了GO/有机改性Bent(OM-Bent)复合材料,用其处理浓度为10mg·L-1的含Cd(Ⅱ)废水。研究了GO/OM-Bent复合材料中GO含量、pH、GO/OM-Bent复合材料投加量、反应时间、Cd(Ⅱ)初始浓度及共存离子对GO/OM-Bent复合材料吸附Cd(Ⅱ)的影响。结果表明:在pH值为6、GO质量分数为30wt%、GO/OM-Bent复合材料投加量为200mg·L-1时,GO/OM-Bent复合材料吸附Cd(Ⅱ)效果最佳,120min即达到平衡,较同等条件下OM-Bent和GO单独作用时Cd(Ⅱ)吸附量分别高12.01mg·g-1和5.39mg·g-1;准二级动力学模型能很好地描述其吸附过程,吸附等温线符合Langmuir模型,温度为303 K时,GO/OM-Bent复合材料对Cd(Ⅱ)的最大吸附量为133.33mg·g-1。解吸实验结果表明,经5次吸附-解吸循环实验后,Cd(Ⅱ)的吸附率仍高达83.5%,说明GO/OM-Bent复合材料具有很好的循环再生性能。
Graphene oxide/organo-modified bentonite（GO/OM-Bent）composites were prepared by the synthesis of GO,Bent and cetyltrimethyl ammonium bromide（CTAB）,then the composites were used to treat Cd（Ⅱ）-containing wastewater at a concentration of 10 mg·L-1.The effects of GO content in GO/OM-Bent composite,pH value,GO/OM-Bent composite dosage,reaction time,initial concentration of cadmium and coexisting ions on adsorption of Cd（Ⅱ）by GO/OM-Bent composite were investigated by batch test.The adsorption results of GO/OM-Bent composites are balanced at 120 min with the best effect on Cd（Ⅱ）adsorption under the optimal condition：the pH value is 6,the mass fraction of GO is 30 wt%,the GO/OM-Bent composite dosage is 200 mg·L-1;Under the same conditions,the adsorption capacity of GO/OM-Bent composite is 12.01 mg·g-1 and 5.39 mg·g-1 higher than that of OM-Bent and GO,respectively;the pseudo-second-order kinetics model can well describe the adsorption process and the adsorption isotherm conforms to the Langmuir model.At 303 K,the maximum adsorption capacity of GO/OM-Bent composite on Cd（Ⅱ）could be reached 133.33 mg·g-1.The results of desorption test shows that the adsorption efficiency of Cd（Ⅱ）remains as high as 83.5% after 5 cycles of adsorption-desorption,indicating that GO/OMBent composite has good cyclic regeneration performance.
作者
唐振平
毕玉玺
刘迎九
滑熠龙
凌辉
谢水波
TANG Zhenping;BI Yuxi;LIU Yingjiu;HUA Yilonga;LING Hui;XIE Shuibo(Hu＇nan Provincial Key Laboratory of Pollution Control and Resources Technology,University of South China,Hengyang 421001,China;Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang 421001,China;State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2018年第11期3196-3204,共9页
Acta Materiae Compositae Sinica
基金
湖南省自然科学基金(2016JJ6125)
国家自然科学基金(11475080)
湖南省教育厅(15C1192)
