复合碳材料制备及其吸附双酚A效能研究

来源:用户上传      作者:唐玉霖 吴浩伟 杨欣 龙昕 郭洁 丁飞

　　 摘 要：通^热解废弃酚醛树脂成功制备了一种新型复合碳材料，设置催化剂Co（NO3）2质量分数分别为0.75%、1.0%和1.5%，热解温度分别为700 ℃、900 ℃和1 100 ℃. 采用场发射扫描电子显微镜、X射线能量色散谱和X-射线光电子能谱仪等手段确定材料的形貌特征与生成机理，通过X射线衍射仪和拉曼光谱研究催化剂质量分数和热解温度对碳纳米管生成的影响，采用比表面积（Brunauer-Emmett-Teller，BET）测试方法和BJH模型分别计算材料比表面积和平均孔径. 通过磁性测试和Zeta电位表征材料磁性能否磁性分离以及不同pH值环境下材料稳定性. 将不同掺入量的复合材料和商用碳纳米管对双酚A的吸附去除效能进行对比，用Langmuir和Freundlich模型进行吸附数据拟合. 结果表明，复合碳材料表面均匀生成大量碳纳米管，CoO金属氧化物附着于碳管内和端点处;材料的比表面积高达290.74 m2/g、平均孔径仅为3.63 nm. 通过对双酚A的吸附性能研究，发现在6 h内可达到吸附平衡，吸附过程更符合Freundlich模型，表明材料表面存在不同类型的活性吸附点位，吸附发生在复杂的异相界面，双酚A的最大吸附容量为53.19 mg/g.
　　 关键词：复合材料;酚醛树脂;资源化;双酚A;吸附
　　 中图分类号：X783.2 文献标志码：A
　　Study on Preparation of Composite Carbon Material and
　　Adsorption Performance of Bisphenol A
　　TANG Yulin1，WU Haowei1?，YANG Xin1，2，LONG Xin1，2，GUO Jie3，DING Fei3
　　（1. College of Environmental Science and Engineering，Tongji University，Shanghai 200092，China;
　　2. Chengdu Institute of Planning & Design，Chengdu 610041，China;
　　3. Kunshan Sewage Treatment Co，Ltd，Kunshan 215000，China）
　　 Abstract：Waste phenolic resin was employed to prepare a composite adsorptive carbon material via the pyrolysis method. Co（NO3）2 doping amount was set to be 0.75%， 1.0%， 1.5%， and the pyrolysis temperature 700 ℃， 900 ℃， 1 100 ℃， respectively. Morphology and formation mechanism of the material were investigated by means of scanning electron microscope （SEM）， energy dispersive spectroscopy （EDS）， and X-ray photoelectron spectroscopy （XPS）. X-ray diffractometer （XRD） and Raman spectroscopy were used to explore the effect of catalyst amount and pyrolysis temperature on the formation of carbon nanotubes. BET surface area test method and BJH model were employed to calculate specific surface area and average pore size. The magnetic test and Zeta potential were used to characterize the magnetic separation of the material and the stability under different pH. The adsorption and removal efficiencies of material with different doping levels for Bisphenol A （BPA） were compared with those of commercial carbon nanotubes. And the adsorption isotherms of Langmuir and Freundlich models were used to fit the adsorption data to explore the adsorption mechanism. The results showed that carbon nanotubes were uniformly generated on the surface of the material， with cobalt oxides inside the carbon tubes and at the ends. The specific surface area of the material was 290.74 m2/g and the average pore diameter was only 3.63 nm. Adsorption equilibrium could be reached within 6 hours and the adsorption process was more consistent with the Freundlich model， indicating that there were different types of active adsorption sites on the surface of the material， and adsorption occurred at a complex heterogeneous interface. The maximum adsorption capacity was 53.19 mg/g.
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