Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science & Technology, Ganzhou 341000, China.
Int J Environ Res Public Health. 2018 Aug 3;15(8):1654. doi: 10.3390/ijerph15081654.
The new surfactant-enhanced metal oxides composite catalysts have been prepared using solid state method and characterized by the N₂-adsorption-desorption, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), and X-ray diffraction (XRD) techniques. Catalytic activity of the synthesized powders has been investigated in the liquid-phase catalytic ozonation ammonia nitrogen (NH₄⁺) (50 mg/L). Especially, the effect of parameters such as optimum molar ratio for metal salt, NaOH and surfactants, temperature, and time of calcinations was also considered. Leveraging both high catalytic activity in NH₄⁺degradation and more harmless selectivity for gaseous nitrogen, the CTAB/NiO catalyst is the best among 24 tested catalysts, which was generated by calcining NiCl₂·6H₂O, NaOH, and CTAB under the molar ratio 1:2.1:0.155 at 300 °C for 2 h. With CTAB/NiO, NH₄⁺ removal rate was 95.93% and gaseous nitrogen selectivity was 80.98%, under the conditions of a pH of 9, ozone flow of 12 mg/min, dosage of catalyst 1.0 g/L, reaction time 120 min, and magnetic stirring speed 600 r/min in room temperature.
新型表面活性剂增强金属氧化物复合催化剂采用固态法制备，通过 N₂-吸附-脱附、扫描电子显微镜 (SEM)、能谱分析 (EDS)、透射电子显微镜 (TEM) 和 X 射线衍射 (XRD) 技术进行了表征。考察了合成粉末在液相催化臭氧化氨氮（NH₄⁺）（50mg/L）中的催化活性。特别是，还考虑了金属盐、NaOH 和表面活性剂的最佳摩尔比、温度和煅烧时间等参数的影响。在 NH₄⁺降解方面具有高催化活性，对气态氮具有更高的选择性，CTAB/NiO 催化剂是 24 种测试催化剂中最好的一种，它是由 NiCl₂·6H₂O、NaOH 和 CTAB 在摩尔比 1:2.1:0.155 下于 300°C 煅烧 2 小时制得的。在 CTAB/NiO 催化剂存在的条件下，在 pH 值为 9、臭氧流量为 12mg/min、催化剂用量为 1.0g/L、反应时间为 120min、室温下磁搅拌速度为 600r/min 的条件下，NH₄⁺去除率为 95.93%，气态氮选择性为 80.98%。
