丁静亚,席阳春,周毅,王白林,程峰,许琦.g-C3N4负载Co及其分解臭氧性能研究[J].分子催化编辑部,2020,34(1):19-27
g-C3N4负载Co及其分解臭氧性能研究
Efficient Decomposition of Ozone over Co-modified g-C3N4 Catalysts
投稿时间:2019-12-05  修订日期:2020-01-02
DOI:
中文关键词:  臭氧分解    g-C3N4
英文关键词:ozone decomposition  cobalt  graphitic carbon nitride
基金项目:国家重点研发计划(2016YFC0209203);江苏省协同创新中心联合开放基金(JH201806).
作者单位E-mail
丁静亚 江苏大学 化学化工学院, 江苏 镇江 212013
盐城工学院 化学化工学院, 江苏 盐城 224051 
 
席阳春 盐城工学院 化学化工学院, 江苏 盐城 224051  
周毅 盐城工学院 化学化工学院, 江苏 盐城 224051  
王白林 江苏大学 化学化工学院, 江苏 镇江 212013
盐城工学院 化学化工学院, 江苏 盐城 224051 
 
程峰 盐城工学院 江苏省新型环保重点实验室, 江苏 盐城 224051 ycxqsteve@163.com 
许琦 盐城工学院 化学化工学院, 江苏 盐城 224051 chwasp@163.com 
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中文摘要:
      用尿素热解合成了g-C3N4载体,再通过NaBH4还原制备了g-C3N4负载Co(Co/g-C3N4)催化剂,研究了Co负载量对臭氧分解效率的影响.在臭氧的体积分数为4×10-5,空速600 L·L-1·h-1,湿度为1%时,负载量为0.30%和6.00%(重量百分比)的Co/g-C3N4对臭氧的分解率分别为80%和60%.0.30%×10-6样品中Co主要通过Co—N键和g-C3N4中3-s-三嗪结构的N结合.6.00%(重量百分比)的样品中Co团聚成粒径约20 nm的颗粒.经过6 h反应后,0.30%(重量百分比)的Co/g-C3N4在80℃加热30 min即可再生,经5次循环使用后,分解臭氧效率仅下降了5%,6.00% Co/g-C3N4不能通过此方法再生.0.30% Co/g-C3N4中和N结合的Co原子簇,是其消除臭氧效率高且易再生的原因.
英文摘要:
      A series of Co/g-C3N4 catalysts were prepared by a NaBH4-reduction method using g-C3N4 from pyrolysis of urea as a precursor. The performance of catalysts was evaluated by elimination of ozone. At the ozone concentration of 4×10-5, air speed of 600 L·L-1·h-1 and humidity of 1%, the ozone conversions over 0.30%(Percent weight) and 6.00%(Percent weight) Co/g-C3N4 are 80% and 60%, respectively. The Co-N bonds were formed between the cobalt cluster and the exposed nitrogen atoms of three tri-s-triazine based structures. And the Co atoms agglomerated into particles with the size of 20 nm in the latter catalyst. After 6 hours of reaction, 0.30%(Percent weight) Co/g-C3N4 could be regenerated after heating at 80 ℃ for 30 minutes. After 5 cycles, the decomposition efficiency of ozone decreased only by 5%, and 6.00%(Percent weight)Co/g-C3N4 could not be regenerated by this method. The high efficiency of ozone decomposition and easy regeneration of 0.30%(Percent weight)Co/g-C3N4 is due to that the cobalt cluster coordinated with N atoms of three tri-s-triazine rings.
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