TY - JOUR
T1 - Photocatalytic reduction of CO2 by graphitic carbon nitride polymers derived from urea and barbituric acid
AU - Qin, Jiani
AU - Wang, Sibo
AU - Ren, He
AU - Hou, Yidong
AU - Wang, Xinchen
N1 - Funding Information:
This work is financially supported by the National Basic Research Program of China ( 2013CB632405 and 2014CB260406 ), National Natural Science Foundation of China ( 21425309 and 21173043 ), the State Key Laboratory of NBC Protection for Civilian ( SKLNBC2013-04K ), and the Specialized Research Fund for the Doctoral Program of Higher Education ( 20133514110003 ).
Publisher Copyright:
© 2015.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Conjugated carbon nitride nanosheets modified with barbituric acid (BA) were synthesized by a facile one-pot chemical condensation of urea. The obtained BA-modified carbon nitride samples were termed as CNU-BAX and were fully characterized by XRD, FTIR, XPS, NMR, EPR, FESEM, TEM, DRS, PL, BET and photocurrent measurements. The performance of the developed carbon nitride based semiconductors was investigated by applying them as polymeric photocatalysts for the reduction of CO2 under visible light illumination. Results revealed that the copolymerization of urea with BA co-monomer strongly alternated the physical and chemical properties of carbon nitride polymer by improving optical absorption and creating surface molecular heterojunction that promoted charge separation, and consequently the enhanced photocatalytic performance was achieved. Various reaction parameters were investigated and optimized for the reaction system, and we found that under the optimal reaction condition, the best sample (CNU-BA0.03) could effectively photocatalyze the CO2-to-CO conversion reaction with 15-fold-enhanced catalytic activity, compared to the non-modified sample derived from urea (named as CNU). Other typical comonomers were also selected to polymerize with urea to study the beneficial effect of copolymerization on the development of efficient carbon nitride based nanostructures for CO2 photoreduction.
AB - Conjugated carbon nitride nanosheets modified with barbituric acid (BA) were synthesized by a facile one-pot chemical condensation of urea. The obtained BA-modified carbon nitride samples were termed as CNU-BAX and were fully characterized by XRD, FTIR, XPS, NMR, EPR, FESEM, TEM, DRS, PL, BET and photocurrent measurements. The performance of the developed carbon nitride based semiconductors was investigated by applying them as polymeric photocatalysts for the reduction of CO2 under visible light illumination. Results revealed that the copolymerization of urea with BA co-monomer strongly alternated the physical and chemical properties of carbon nitride polymer by improving optical absorption and creating surface molecular heterojunction that promoted charge separation, and consequently the enhanced photocatalytic performance was achieved. Various reaction parameters were investigated and optimized for the reaction system, and we found that under the optimal reaction condition, the best sample (CNU-BA0.03) could effectively photocatalyze the CO2-to-CO conversion reaction with 15-fold-enhanced catalytic activity, compared to the non-modified sample derived from urea (named as CNU). Other typical comonomers were also selected to polymerize with urea to study the beneficial effect of copolymerization on the development of efficient carbon nitride based nanostructures for CO2 photoreduction.
KW - CO reduction
KW - Copolymerization
KW - Graphitic carbon nitride
KW - Nanosheets
KW - Photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=84928891395&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2015.05.005
DO - 10.1016/j.apcatb.2015.05.005
M3 - Article
AN - SCOPUS:84928891395
SN - 0926-3373
VL - 179
SP - 1
EP - 8
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -