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Study on preparation of g-C3N4/g-C3N4 homojunction by supramolecular precursor and its photocatalytic property
Received date: 2021-05-20
Online published: 2022-03-18
g-C3N4/g-C3N4 homojunction(CN-HP) with the morphology of porous nanosheets and hollow nanotubes was pre-pared from supramolecular precursor prepared by mixed calcination of dicyanodiamine hydrothermal method and melamine-cyanuric acid coprecipitation method.The photocatalyst was characterized by X-ray diffraction(XRD),scanning electron mi-croscopy(SEM),transmission electron microscopy(TEM),ultraviolet-visible diffuse reflectance(UV-Vis DRS),photolumi-nescence spectroscopy(PL),etc.The results showed that CN-HP-1/1 exhibited a degradation rate of 99.8% for methylene blue(MB) within 75 min,and the pseudo first-order kinetic constant was 4.02 h-1,which was 5 times that of bulk g-C3N4.And the reaction constant per unit specific surface area was increased to 1.8 times that of monomeric g-C3N4.The PL test showed that the photogenerated electron-hole recombination rate of the homojunction prepared by the appropriate ratio of MCA was lower than that of the monomer g-C3N4. Free radical capture experiments showed that photo-generated holes were the main active species in the photocatalytic degradation process.Combined with XPS valence band spectroscopy tests,it was proposed that the homojunction photocatalysts had a Z-scheme electron transport mechanism.
Key words: g-C3N4; supramolecular; homojunctions; photocatalysis
Changsheng BAN , Jun LI , Yang JIN , Ming CHEN , Longtao ZUO . Study on preparation of g-C3N4/g-C3N4 homojunction by supramolecular precursor and its photocatalytic property[J]. Inorganic Chemicals Industry, 2022 , 54(3) : 125 -131 . DOI: 10.19964/j.issn.1006-4990.2021-0260
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