• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Nanosized Co3O4/SiO2 for heterogeneous oxidation of phenolic contaminants in waste water
【24h】

Nanosized Co3O4/SiO2 for heterogeneous oxidation of phenolic contaminants in waste water

机译：纳米级Co3O4 / SiO2用于废水中酚类污染物的多相氧化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nanosized silica supported Co catalysts were prepared using three different Co(II) precursor salts, nitrate (N), chloride (CI) and acetate (Ac). The physicochemical properties of the three Co/SiO2 catalysts were characterized by several techniques, such as XRD, SEM, TEM, FT-IR, FT-Raman and UV-vis diffuse reflectance spectroscopy, and the catalytic activity in heterogeneous activation of peroxymonosulphate to produce sulphate radicals for phenol degradation was investigated. It was found that anions of Co precursor affected the interaction between Co metal and support, influencing the properties of the catalysts and their catalytic activity. All three Co/SiO2 catalysts exhibited high activity in sulphate radical generation and phenol degradation. The Co/SiO2 prepared using Co nitrate showed a strong Co and support interaction by forming Co3O4 and Co2SiO4 species and exhibited less leaching of Co. The rate of phenol oxidation on Co/S1O2 followed an order of Co/SiO2-Cl > Co/SiO2-Ac> Co/SiO2-N while the stability of the three catalysts presented an opposite trend. Co/SiO2-N still exhibited higher activity after three-run tests while the other two catalysts showed significant deactivation. Phenol degradation on Co/SiO2 followed zero order kinetics and activation energies of Co/SiO2-N, Co/SiO2-Cl, Co/SiO2-AC were obtained as 67.5, 75.1 and 61.7 kj/mol, respectively.
机译：使用三种不同的Co（II）前体盐，硝酸盐（N），氯化物（CI）和乙酸盐（Ac）制备了纳米尺寸的二氧化硅负载的Co催化剂。通过XRD，SEM，TEM，FT-IR，FT-Raman和UV-vis漫反射光谱等几种技术表征了三种Co / SiO2催化剂的理化性质，以及过氧化单硫酸盐非均相活化生成产物的催化活性。研究了硫酸根自由基对苯酚的降解作用。发现Co前体的阴离子影响Co金属与载体之间的相互作用，影响催化剂的性质及其催化活性。三种Co / SiO2催化剂在硫酸根生成和苯酚降解方面均表现出高活性。用硝酸钴制备的Co / SiO2通过形成Co3O4和Co2SiO4物种表现出很强的Co和支撑相互作用，并且Co的浸出较少。Co/ S1O2上苯酚的氧化速率遵循Co / SiO2-Cl> Co / SiO2的顺序-Ac> Co / SiO2-N，而三种催化剂的稳定性却呈现相反的趋势。经过三轮测试后，Co / SiO2-N仍显示出较高的活性，而其他两种催化剂则表现出明显的失活。 Co / SiO2上苯酚的降解遵循零级动力学，Co / SiO2-N，Co / SiO2-Cl，Co / SiO2-AC的活化能分别为67.5、75.1和61.7 kj / mol。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号