Efficient singlet oxygen generation by excitonic energy transfer on ultrathin g-C3N4 for selective photocatalytic oxidation of methyl-phenyl-sulfide with O2

单线态氧 石墨氮化碳 光化学 纳米片 光催化 化学 磷光 材料科学 氧气 催化作用 有机化学 荧光 量子力学 物理
作者
Fan Yang,Xiaoyu Chu,Jianhui Sun,Yuhang Zhang,Zhijun Li,Haiyue Liu,Linlu Bai,Yang Qu,Liqiang Jing
出处
期刊:Chinese Chemical Letters [Elsevier BV]
卷期号:31 (10): 2784-2788 被引量:61
标识
DOI:10.1016/j.cclet.2020.07.033
摘要

Efficient generation of singlet oxygen (1O2) by an excitonic energy transfer process is highly desired on a semiconductor photocatalyst for selective oxidation of methyl phenyl sulfide (MPS). Herein, it is demonstrated that a large amount of 1O2 is produced on pristine graphitic carbon nitride (CN) nanosheet compared with bismuth oxybromide (BiOBr) and commercial P25 titanium dioxide (TiO2). This leads to a certain photoactivity of CN for MPS oxidation. The observed ∼77% selectivity for CN depends on the competitive results of excitonic energy transfer for 1O2 formation and charge carrier separation for superoxide radical (O2−) production, which are based on the phosphorescence spectra and electron paramagnetic resonance signals, respectively. Moreover, ultrathin CN nanosheets are synthesized by thermal treatment with the cyanuric acid-melamine hydrogen bonded aggregates as precursors. It is confirmed that the amount of produced 1O2 could be increased by decreasing the thickness of resultant CN nanosheets. The optimized ultrathin CN nanosheet (∼4 nm) exhibits excellent photoactivity with high selectivity (∼99%). It is suggested that the excitonic energy transfer for 1O2 formation is close related to the intrinsic exciton binding energy and the two-dimensional quantum confinement effect. This work establishes a basic mechanistic understanding on the excitonic processes in CN, and develops a feasible route to design CN-based photocatalysts for efficient 1O2 generation.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
zcy发布了新的文献求助10
刚刚
刚刚
香蕉觅云应助云岫采纳,获得10
刚刚
刚刚
1秒前
全若之发布了新的文献求助10
2秒前
爆米花应助谷大喵唔采纳,获得10
3秒前
小马甲应助旺仔Mario采纳,获得10
3秒前
思源应助乘风采纳,获得10
3秒前
PT177245发布了新的文献求助10
4秒前
4秒前
6秒前
7秒前
7秒前
陈某关注了科研通微信公众号
8秒前
zcy完成签到,获得积分10
9秒前
EgoElysia关注了科研通微信公众号
9秒前
天天快乐应助未道采纳,获得10
10秒前
归尘发布了新的文献求助10
10秒前
11秒前
隐形曼青应助科研通管家采纳,获得10
11秒前
猪猪hero应助科研通管家采纳,获得10
11秒前
orixero应助科研通管家采纳,获得10
12秒前
情怀应助科研通管家采纳,获得10
12秒前
pluto应助科研通管家采纳,获得10
12秒前
12秒前
田様应助科研通管家采纳,获得10
12秒前
12秒前
香蕉觅云应助科研通管家采纳,获得10
12秒前
12秒前
pluto应助科研通管家采纳,获得10
12秒前
彭于彦祖应助科研通管家采纳,获得50
12秒前
科研通AI5应助科研通管家采纳,获得10
12秒前
坦率的匪应助科研通管家采纳,获得10
13秒前
13秒前
李健应助科研通管家采纳,获得10
13秒前
Bio应助科研通管家采纳,获得150
13秒前
recovery应助科研通管家采纳,获得10
13秒前
科研通AI2S应助科研通管家采纳,获得10
13秒前
13秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988827
求助须知:如何正确求助?哪些是违规求助? 3531197
关于积分的说明 11252739
捐赠科研通 3269830
什么是DOI,文献DOI怎么找? 1804815
邀请新用户注册赠送积分活动 881915
科研通“疑难数据库(出版商)”最低求助积分说明 809028