| 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,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 钴 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）. |
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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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