采用水热法合成了氧化铈-石墨烯(CeO2-rG)复合材料,并用XRD、TEM、FT-IR、Raman、UV-Vis等手段进行了表征.以CeO2-rG为光催化剂,在可见光λ>400 nm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100.0 mg/L、溶液的pH值为10.0、溶液体积50.0 mL、催化剂量为0.1 g、可见光辐射8 h时,单组份CeO2降解氨氮的效率仅为38%, 而CeO2-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.
CeO2-rG hybrid material was synthesized by hydrothermal reaction, the as-synthesized material was characterized by XRD, TEM, FT-IR, Raman and UV-Vis diffuse reflectance spectra.The resulting CeO2-rG composite was utilized for the photo-catalytic degradation of ammonia under λ>400 nm visible light irradiation.The effects of different parameters such as the amount of catalyst, pH value, initial concentration of ammonia, GO content on the degradation efficiency were investigated.The results showed that a degradation ratio of 92.4% was achieved using 0.10 g CeO2-rG (GO 5.0wt%) hybrid material as the photocatalyst in 50 mL solution containing 100 mg/L ammonia-N with pH 10.0 under visible light for 8 h, whereas the degradation ratio of CeO2 for ammonia was only 38.0% under similar conditions.The kinetic studies showed that the degradation of ammonia follows the first-order reaction and the apparent rate constant is equal to 4.2×10-3min-1.The reaction mechanism was analyzed based on the degradation products.
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