Phosphorus-Doped Graphitic Carbon Nitride Nanotubes with Amino-rich Surface for Efficient CO2 Capture, Enhanced Photocatalytic Activity, and Product Selectivity

• DOI: 10.1021/acsami.7b17503
• Publication Date: 2017-12-26T14:57:07Z
• Authors: Bing Liu; Liqun Ye; Ran Wang; Jingfeng Yang; Yuexing Zhang; Rong Guan; Lihong Tian; Xiaobo Chen
• Keywords: Graphitic carbon nitride; Specific surface area

Phosphorus-doped graphitic carbon nitrides (P-g-C3N4) have recently emerged as promising visible-light photocatalysts for both hydrogen generation and clean environment applications because of fast charge carrier transfer increased light absorption. However, their photocatalytic performances on CO2 reduction gained little attention. In this work, phosphorus-doped g-C3N4 nanotubes are synthesized through the one-step thermal reaction melamine sodium hypophosphite monohydrate (NaH2PO2·H2O). The phosphine gas generated from decomposition NaH2PO2·H2O induces formation P-g-C3N4 nanosheets, leads to an enlarged BET surface area a unique mesoporous structure, creates amino-rich surface. interstitial doping phosphorus also down shifts conduction valence band positions narrows gap g-C3N4. activities dramatically enhanced in produce CO CH4 water H2 efficient suppression recombination electrons holes. adsorption capacity is improved 3.14 times, production increases 3.10 13.92 times that g-C3N4, respectively. total evolution ratio CO/CH4 decreases 1.30 6.02 indicating higher selectivity product P-g-C3N4, which likely ascribed structure