Enhanced photocatalytic activity for degrading pollutants of g-C 3 N 4 by promoting oxygen adsorption after H 3 BO 3 modification

Chengming Li, Fazal Raziq, Chong Liu, Zhijun Li, Liqun Sun, Liqiang Jing

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Scopus citations

Abstract

The g-C 3 N 4 has been modified by a hydrothermal post treatment with orthoboric acid. It is shown that the surface modification with an appropriate amount of orthoboric acid obviously enhances the surface photovoltage responses of g-C 3 N 4 , clearly indicating that the separation of photogenerated charges is greatly improved. This is well responsible for the enhanced photocatalytic activities for degrading representative gas-phase acetaldehyde, and liquid-phase phenol. Moreover, it is demonstrated that the amount of O 2 adsorbed on the surfaces of g-C 3 N 4 is greatly increased after H 3 BO 3 modification based on the O 2 temperature-programmed desorption curves. It is suggested that the orthoboric acid modification favors O 2 adsorption to promote the photogenerated electrons captured for improved photocatalytic activities. This work would provide feasible routes to further improve the photocatalytic performance of semiconductors for degrading pollutants.
Original languageEnglish (US)
Title of host publicationApplied Surface Science
PublisherElsevier B.V.
Pages240-245
Number of pages6
DOIs
StatePublished - Dec 15 2015
Externally publishedYes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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