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用于高效光催化降解三甲胺的Ag/AgBr-富氧石墨相氮化碳

Ag/AgBr-oxygen enriched g-CN for efficient photocatalytic degradation of trimethylamine.

作者信息

Chen Xinru, Duan Zeyu, He Feiyang, Wang Haiqiang, Wu Zhongbiao

机构信息

Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University Hangzhou 310058 P.R. China

Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control Hangzhou 310058 P. R. China.

出版信息

RSC Adv. 2024 Apr 29;14(20):14068-14079. doi: 10.1039/d4ra02395a. eCollection 2024 Apr 25.

DOI:10.1039/d4ra02395a
PMID:38686283
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11057413/
Abstract

In this study, Ag/AgBr-O-gCN samples with ternary Z-type heterojunctions were prepared by photoreduction using water as the reducing agent for generating Ag/AgBr active species and oxygen doping. The experimental results indicated that Ag/AgBr-O-gCN degraded trimethylamine by nearly 100% in half an hour and maintained 90% of its original activity after five cycles. The kinetic constant of Ag/AgBr-O-gCN was excellent at 0.0928 min, 3.8 times that of gCN, 2.3 times that of Ag/AgBr-gCN, and 1.9 times that of O-gCN. Unlike Ag/AgBr-gCN photoreduced by methanol, gCN was used as an electron donor in the aqueous solution during the photoreduction process, and oxidation sites between the gCN skeleton and Ag/AgBr were formed for constructing the heterojunction system. The Z-type heterojunction system was established by introducing a suitable size of Ag nanoparticles as the recombination center to keep indirect contact between gCN and AgBr. This effectively reduced the electron-hole recombination rate and caused activity enhancement. This study offers a novel idea for the construction of a ternary heterojunction.

摘要

在本研究中，采用水作为还原剂进行光还原以生成Ag/AgBr活性物种并进行氧掺杂，制备了具有三元Z型异质结的Ag/AgBr-O-gCN样品。实验结果表明，Ag/AgBr-O-gCN在半小时内将三甲胺降解了近100%，并且在五个循环后仍保持其原始活性的90%。Ag/AgBr-O-gCN的动力学常数优异，为0.0928 min，是gCN的3.8倍、Ag/AgBr-gCN的2.3倍以及O-gCN的1.9倍。与用甲醇光还原的Ag/AgBr-gCN不同，在光还原过程中，gCN在水溶液中用作电子供体，并且在gCN骨架与Ag/AgBr之间形成氧化位点以构建异质结体系。通过引入合适尺寸的Ag纳米颗粒作为复合中心来建立Z型异质结体系，以使gCN与AgBr保持间接接触。这有效地降低了电子-空穴复合率并导致活性增强。本研究为构建三元异质结提供了新思路。

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