升温速率对尿素热解制g-C3N4光催化剂构效影响研究

doi:10.19964/j.issn.1006-4990.2021-0310

摘要/Abstract

摘要：

尿素热解可制备高附加值下游产品石墨相氮化碳（g-C₃N₄）,热解条件显著影响其光催化性能。以工业级尿素为前驱体,考察了升温速率对产物g-C₃N₄结构和光催化性能的影响,并用于光催化氧化降解有机染料和光催化还原生产双氧水。结果表明,快速升温（15 ℃/min）所得g-C₃N₄（GCN-15）结晶度高、无定型结构少、带隙窄、光利用率高、共轭结构完整,利于光生电子传递,因此具有更好的光催化性能。其对罗丹明B（RhB）和亚甲基蓝（MB）光氧化降解速率分别是慢速升温（2 ℃/min）所得g-C₃N₄（GCN-2）的4倍和2倍,8 h光还原双氧水产量提高18.37%。

关键词: 石墨相氮化碳, 工业级尿素热解, 构效关系, 升温速率, 光催化

Abstract:

High value added downstream products graphitic carbon nitride（g-C₃N₄） can be prepared by pyrolysis of urea,but its photocatalytic performance is significantly affected by pyrolysis conditions.Industrial grade urea was used as precursor,the effect of heating rate on the structure and photocatalytic performance of g-C₃N₄ was investigated,and g-C₃N₄ was used for photocatalytic oxidation degradation of organic dyes and photocatalytic reduction to produce H₂O₂.The results showed that g-C₃N₄（GCN-15） with rapid heating rate（15 °C/min） had high crystallinity,less amorphous structure,more complete conjugated structure and narrow band gap,which was beneficial to the transfer of photogenerated electrons and the improvement of photocatalytic performance.The photodegradation rates of RhB and MB by GCN-15 were 4 and 2 times higher than those by GCN-2,respectively,and the yield of H₂O₂ produced in 8 hours was increased by 18.37%.

Key words: g-C₃N₄, pyrolysis of industrial grade urea, structure-activity relationship, heating rate, photocatalysis

中图分类号:

O643.36

杨文博,吴潘,何坚,刘长军,蒋炜. 升温速率对尿素热解制g-C₃N₄光催化剂构效影响研究[J]. 无机盐工业, 2022, 54(4): 169-174.

YANG Wenbo,WU Pan,HE Jian,LIU Changjun,JIANG Wei. Study on effect of heating rate on structure-activity of g-C₃N₄photocatalyst by pyrolysis of urea[J]. Inorganic Chemicals Industry, 2022, 54(4): 169-174.

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升温速率对尿素热解制g-C₃N₄光催化剂构效影响研究

Study on effect of heating rate on structure-activity of g-C₃N₄photocatalyst by pyrolysis of urea

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