Enhanced photocatalytic organic pollutant degradation and H2 evolution reaction over carbon nitride nanosheets: N defects abundant materials

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dc.contributor.authorMeng, F.
dc.contributor.authorTian, W.
dc.contributor.authorTian, Z.
dc.contributor.authorTan, X.
dc.contributor.authorZhang, H.
dc.contributor.authorWang, S.
dc.date.issued2022
dc.description.abstractPost thermal treatment of bulk graphitic carbon nitride (g-C3N4) by ammonia gas acts as a significant structure regulation approach, while pure ammonia-assisted g-C3N4 synthesis from precursors like melamine is rarely investigated. Here we prove the synthesis of N-defects abundant carbon nitride nanosheets (ACN) through a one-pot thermal polymerization of melamine in pure ammonia gas, for photocatalytic organic pollutant removal in water and H2 evolution applications. Compared to bulk g-C3N4 (BCN), ACN-550 (ACN prepared at 550 °C) exhibited thin-layered porous morphology with higher surface area and abundant N defects, resulting in wider distribution of active sites. Moreover, the abundant N defects in the heptazine heterocycle structure could change the electronic structure of g-C3N4, leading to more efficient transport of photogenerated charge carriers and enhanced photoreduction potential,which gives rise to notable improvement activities in photocatalytic reaction.With superoxide ion radical and photoinduced holes as the predominant reactive species, ACN-550 realized efficient photocatalytic bisphenol A (BPA) degradation, which is 1.6- and 4.7-fold high over commercial TiO2 (P25) and BCN, respectively. ACN-550 exhibited excellent reusability and stability in five consecutive photocatalytic BPA degradation tests. In photo-reductive H2 production system by ACN-550, 761.8 ± 4.3 μmol/h/g H2 was produced, which was 11.6-fold as high as that by BCN.
dc.description.statementofresponsibilityFanpeng Meng, Wenjie Tian, Zhihao Tian, Xiaoyao Tan, Huayang Zhang, Shaobin Wang
dc.identifier.citationScience of the Total Environment, 2022; 851(2)
dc.identifier.doi10.1016/j.scitotenv.2022.158360
dc.identifier.issn0048-9697
dc.identifier.issn1879-1026
dc.identifier.orcidTian, W. [0000-0002-7503-5481] [0000-0002-9896-1154]
dc.identifier.orcidWang, S. [0000-0002-1751-9162]
dc.identifier.urihttps://hdl.handle.net/2440/136819
dc.language.isoen
dc.publisherElsevier BV
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101105
dc.rights© 2022 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.scitotenv.2022.158360
dc.subjectGraphitic carbon nitride nanosheets; Ammonia gas treatment; Nitrogen defects; Photodegradation; Hydrogen production
dc.titleEnhanced photocatalytic organic pollutant degradation and H2 evolution reaction over carbon nitride nanosheets: N defects abundant materials
dc.typeJournal article
pubs.publication-statusPublished

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