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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - High-temperature continuous hydrothermal post treatment derived g-C3N4 for enhanced photocatalytic H2 production
AU - Zhai, B.
AU - Li, Y.
AU - Jiang, Y.
AU - Mao, L.
AU - Shi, J.
AU - Zhao, Q.
AU - Bin, Z.
AU - Wang, F.
AU - Du, Y.
AU - Jin, H.
PY - 2025/5/31
Y1 - 2025/5/31
N2 - Nowadays, hydrothermal post treatment is a promising method for the modification of g-C3N4. This paper illustrates the post-treatment modification of g-C3N4 achieved by using a continuous hydrothermal system (CHS) with high heating rates (25–50 °C/s), short residence time (25.2–50.3 s), high reaction temperatures (250–300 °C) and high pressure (about 19 MPa). The continuous hydrothermal post treatment derived g-C3N4 (CHT-CN) prepared at 280 °C with 9 ml min−1 flow rate of g-C3N4 dispersion (CN-280/9) exhibits 5.6 times the photocatalytic H2-evolution activity of CN-30/9 under visible light irradiation (λ > 400 nm). Due to the exfoliation and shearing action of high-temperature and high-pressure water, the specific surface area of CN-280/9 reaches 65.8 m2 g−1, which is 4.3 times of CN-30/9 and therefore lead to an increase in reactive sites available for photocatalytic reactions. Moreover, the continuous hydrothermal post treatment results in the disruption of the conjugate structure of pristine g-C3N4 to build new channels, which allows more electrons to be transferred from bulk to surface to participate in the reduction reaction, and thus enhancing the H2-evolution activity. This work provides a valuable reference to potentially achieving the large-scale production of efficient photocatalysts based on the continuous high-temperature and high-pressure hydrothermal method.
AB - Nowadays, hydrothermal post treatment is a promising method for the modification of g-C3N4. This paper illustrates the post-treatment modification of g-C3N4 achieved by using a continuous hydrothermal system (CHS) with high heating rates (25–50 °C/s), short residence time (25.2–50.3 s), high reaction temperatures (250–300 °C) and high pressure (about 19 MPa). The continuous hydrothermal post treatment derived g-C3N4 (CHT-CN) prepared at 280 °C with 9 ml min−1 flow rate of g-C3N4 dispersion (CN-280/9) exhibits 5.6 times the photocatalytic H2-evolution activity of CN-30/9 under visible light irradiation (λ > 400 nm). Due to the exfoliation and shearing action of high-temperature and high-pressure water, the specific surface area of CN-280/9 reaches 65.8 m2 g−1, which is 4.3 times of CN-30/9 and therefore lead to an increase in reactive sites available for photocatalytic reactions. Moreover, the continuous hydrothermal post treatment results in the disruption of the conjugate structure of pristine g-C3N4 to build new channels, which allows more electrons to be transferred from bulk to surface to participate in the reduction reaction, and thus enhancing the H2-evolution activity. This work provides a valuable reference to potentially achieving the large-scale production of efficient photocatalysts based on the continuous high-temperature and high-pressure hydrothermal method.
U2 - 10.1016/j.jcis.2025.01.195
DO - 10.1016/j.jcis.2025.01.195
M3 - Journal article
VL - 685
SP - 1099
EP - 1108
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 1095-7103
ER -