石墨烯-氧化铈杂化材料的合成及可见光催化降解氨氮

发布时间：2018-05-27 01:48

本文选题：石墨烯-氧化铈 + 杂化材料　；参考：《功能材料》2017年03期

【摘要】：采用水热法合成了氧化铈-石墨烯(CeO_2-rG)复合材料,并用XRD、TEM、FT-IR、Raman、UV-Vis等手段进行了表征。以CeO_2-rG为光催化剂,在可见光λ400nm照射下光催化降解了氨氮。考察了氧化石墨烯含量、溶液的pH值、氨氮初始浓度、催化剂用量对氨氮降解效率的影响。结果表明,当氨氮溶液浓度为100.0mg/L、溶液的pH值为10.0、溶液体积50.0mL、催化剂量为0.1g、可见光辐射8h时,单组份CeO_2降解氨氮的效率仅为38%,而CeO_2-rG(GO 5.0%(质量分数))杂化催化剂降解氨氮的效率达到92.4%。动力学研究表明,氨氮降解遵守一级反应动力学规律,其表观速率常数的平均值为4.2×10-3 min-1。根据反应产物分析了反应机理。
[Abstract]:CeO- graphene oxide / CeO2-rG composites were synthesized by hydrothermal method and characterized by means of XRDX TEMT-IRFT-Ramanhe UV-Vis. Using CeO_2-rG as photocatalyst, the photocatalytic degradation of ammonia nitrogen was carried out under visible light 位 400nm irradiation. The effects of the content of graphene oxide, pH value of solution, initial concentration of ammonia nitrogen and the amount of catalyst on the degradation efficiency of ammonia nitrogen were investigated. The results show that when the concentration of ammonia-nitrogen solution is 100.0 mg / L, the pH value of the solution is 10.0, the volume of solution is 50.0 mL, the amount of catalyst is 0.1 g, and the visible light radiation is 8 h, the efficiency of degradation of ammonia nitrogen by one-component CeO_2 is only 38%, while that of CeO_2-rG(GO 5.0g / L hybrid catalyst reaches 92.44%. The kinetic study shows that the degradation of ammonia nitrogen obeys the first-order kinetic law, and the average apparent rate constant is 4.2 脳 10 ~ (-3) min ~ (-1). The reaction mechanism was analyzed according to the reaction product.
【作者单位】：苏州科技大学江苏省环境功能材料重点实验室化学生物与材料工程学院;
【基金】：国家自然科学基金资助项目(21347006,21576175) 江苏省自然科学基金资助项目(BK20141178) 江苏省产业前瞻资助项目(BE2015190) 绿色催化四川省高校开放课题资助项目(LZJ1304) 苏州市纳米专项资助项目(ZXG201429)
【分类号】：O643.36

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