Shan Yiwei, Guo Ying, Wang Yu, Du Xiran, Yu Jun, Luo Hao, Wu Hui, Boury Bruno, Xiao He, Huang Liulian, Chen Lihui
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China.
ICGM, University of Montpellier, CNRS, ENSCM, Montpellier, France.
J Colloid Interface Sci. 2021 Oct;599:507-518. doi: 10.1016/j.jcis.2021.04.111. Epub 2021 Apr 24.
Using oxygen reduction for the photocatalytic production of hydrogen peroxide (HO) has been considered a green and sustainable route. In the present study, to achieve high efficiency, graphitic carbon nitride (g-CN) was obtained using thermal polymerization from a bi-component precursor and was then assembled with cellulose nanofibers. It was found that a small quantity of cellulose nanofibers that generates carbon fibers upon pyrolysis greatly improves the photocatalytic activity compared with that of g-CN alone. The well-defined carbon/g-CN heterojunction-type material exhibits as high as 1.10 mmol Lh of photo-production of HO under visible light, which is 4.2 times higher than that yielded by pristine g-CN from a single precursor. A comprehensive characterization of the photocatalyst enables us to delineate the effect of the carbon nanofiber with respect to porosity, electron-hole separation, band gap regulation, and especially the electron transfer pathway. Our results demonstrate that nanocellulose-derived carbon, when precisely assembled with other functional material such as a photocatalyst, is a promising promoter of their activity.
利用氧还原光催化生产过氧化氢（HO）被认为是一条绿色可持续的途径。在本研究中，为了实现高效，通过热聚合从双组分前驱体获得了石墨相氮化碳（g-CN），然后将其与纤维素纳米纤维组装。结果发现，少量在热解时会生成碳纤维的纤维素纳米纤维与单独的g-CN相比，极大地提高了光催化活性。这种结构明确的碳/g-CN异质结型材料在可见光下表现出高达1.10 mmol Lh的HO光生成量，这比由单一前驱体制备的原始g-CN产生的量高4.2倍。对光催化剂的全面表征使我们能够描绘出碳纳米纤维在孔隙率、电子-空穴分离、带隙调节方面的作用，尤其是电子转移途径。我们的结果表明，当与其他功能材料如光催化剂精确组装时，源自纳米纤维素的碳是其活性的有前途的促进剂。
