碳载体复合材料的制备及水溶液中硫化物的处理研究

发布时间：2018-01-27 05:42

本文关键词： 碳载体层状双金属氢氧化物电化学氧化电化学检测硫化物　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：以螯合活性炭为载体,采用尿素水解法制备了二氧化铈-镍铝／层状双金属氢氧化物/螫合活性炭复合物(CeO2-NiAl-LDHs/MFT/AC)。并采用傅立叶红外光谱(FT-IR)、X射线晶体衍射(XRD)、场发射扫描电子显微镜(FE-SEM)和电化学方法对复合材料的结构及性能进行了表征。结果表明：花瓣状的CeO2-NiAl-LDHs均匀地分散在螯合活性炭表面。考察了CeO2-NiAl-LDHs/MFT/AC对水溶液中硫化物的吸附行为。结果表明：该吸附过程是自发的吸热反应,符合准二阶动力学模型和Langmuir吸附模型。室温下亚硫酸根离子的最大吸附量为483.09 mg/g,硫离子的最大吸附量为181.15 mg/g。然后,制备了CeO2-NiAl-LDHs/MFT/AC和碳纳米管混合物修饰的充蜡石墨电极(MWCNTs/CeO2-NiAl-LDHs/MFT/AC/WGE)。研究了该电极上对水中硫化物的电化学催化氧化行为。结果表明：该修饰电极能成功地将水中的亚硫酸根和硫离子氧化为硫酸根。以氧化石墨烯为载体,采用尿素水解法制备了二氧化铈-镍铝/层状双金属氢氧化物/氧化石墨烯复合材料(CeO2-NiAl-LDHs/GO).并通过FT-IR、XRD、 FE-SEM和电化学方法对复合材料的结构和性能进行表征。结果表明：层状的CeO2-NiAl-LDHs复合物已形成。采用涂布法制备了CeO2-NiAl-LDHs/GO修饰的充蜡石墨电极,将其用于水中亚硫酸根和硫离的检测子。结果表明:S032-和s2-的氧化峰电流与浓度分别在1×10-6～13×10-6 mol/L和1×10-6～15×10-6 mol/L的浓度范围内,呈良好的线性增长关系,检测限分别为7×10-8 mol/L和2×10-7 mol/L(3σ)。
[Abstract]:The chelate activated carbon was used as the carrier. CeO2-NiAl-LDHs / MFT / AC / CeO2-NiAl-LDHs / MFT / AC composites were prepared by urea hydrolysis method. ... and Fourier transform infrared spectroscopy (FT-IR). X-ray crystal diffraction (XRD). Field emission scanning electron microscope (FE-SEM). And electrochemical methods were used to characterize the structure and properties of the composites. Petal-like CeO2-NiAl-LDHs was uniformly dispersed on the surface of chelate activated carbon. The adsorption behavior of CeO2-NiAl-LDHs/MFT/AC on sulfides in aqueous solution was investigated. The results show that:. The adsorption process is a spontaneous endothermic reaction. According to the quasi-second-order kinetic model and Langmuir adsorption model, the maximum adsorption capacity of sulfite ion at room temperature is 483.09 mg/g. The maximum adsorption capacity of sulfur ion is 181.15 mg / g. A paraffin filled graphite electrode modified with CeO2-NiAl-LDHs/MFT/AC and carbon nanotubes was prepared. MWCNTs / CeO2-NiAl-LDHs / MFT / AC / WGE). The electrochemical catalytic oxidation behavior of sulfides in water on the modified electrode was studied. The results showed that the modified electrode could successfully oxidize sulfite and sulfur ions in water to sulphate radical and take graphene oxide as the carrier. CeO2-NiAl-LDHs / GOG / CEO _ 2-NiAl-LDHs / GOG / CEO _ 2-NiAl-LDHs / O _ 3 composites were prepared by urea hydrolysis method and were characterized by FT-IR XRD. The structure and properties of the composites were characterized by FE-SEM and electrochemical methods. The layered CeO2-NiAl-LDHs complex has been formed and CeO2-NiAl-LDHs/GO modified paraffin graphite electrode was prepared by coating method. The results show that the oxidation peak current and concentration of S032- and s2- in water are 1 脳 10 ~ (-6) ~ (13) 脳 10 ~ (-6), respectively. The concentration range of mol/L and 1 脳 10-6 mol/L is 15 脳 10-6 mol/L. The detection limits were 7 脳 10 ~ (-8) mol/L and 2 脳 10 ~ (-7) mol/L(3 蟽 ~ (-1), respectively.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;X703

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