Fabrication of g-C3N4/Ag3PO4-H2O2 heterojunction system with enhanced visible-light photocatalytic activity and mechanism insight

Jia, JK (Jia, Jiankui)[ 1 ] ; Huang, WX (Huang, Wenxin)[ 1 ] ; Feng, CS (Feng, Changsheng)[ 1 ] ; Zhang, Z (Zhang, Zheng)[ 1 ] ; Zuojiao, KC (Zuojiao, Kaichao)[ 1 ] ; Liu, JX (Liu, Jiaxun)[ 1 ] ; Jiang, CY (Jiang, Caiyun)[ 2 ] ; Wang, YP (Wang, Yuping)[ 1,3 ]*（王玉萍）

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210046, Jiangsu, Peoples R China

[ 2 ] Jiangsu Inst Commerce, Dept Engn & Technol, Nanjing 211168, Jiangsu, Peoples R China

[ 3 ] Nanjing Univ Sci & Technol, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Jiangsu, Peoples R China

JOURNAL OF ALLOYS AND COMPOUNDS，201906,790,616-625

The stability of Ag-based photocatalysts restricted their photocatalytic performance because of their photocorrosion. To solve the problem, the g-C3N4/Ag3PO4 was fabricated through a calcination-deposition way and the novel g-C3N4/Ag3PO4-H2O2 catalytic system was constructed in the article. The cyclic experiment and X-ray diffraction peaks of Ag3PO4 and Ag3PO4-H2O2 showed that the structure stability of g-C3N4/Ag3PO4-H2O2 was protected by using H2O2 preventing the photoetching of Ag3PO4. Ultraviolet visible diffuse reflectance spectroscopy declared that the construction of g-C3N4/Ag3PO4 heterojunction greatly improved the utilization of visible light. In addition, the transient photocurrent responses and photoluminescence spectra demonstrated that the photoinduced holes and electrons were separated effectively formed by g-C3N4 and Ag3PO4. Obviously, the above three processes promoted the excellent stability and photocatalytic performance of the g-C3N4/Ag3PO4-H2O2 catalytic system. The free radical trapping experiments also proved that holes played a leading role in photocatalytic degradation, and the possible mechanism of the g-C3N4/Ag3PO4-H2O2 catalytic system was proposed.

文章链接：

https://www.sciencedirect.com/science/article/pii/S0925838819310643?via%3Dihub

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