Improved performance of Zn-doped SnO2 modified g-C3N4 for visible light-driven photocatalysis
2022
Liu, Wei | Kang, Qun | Wang, Ling | Wen, Lilian | Li, Zhaohua
The low-cost composite of g-C₃N₄ modified by Zn-doped SnO₂ nanoparticles was prepared for the first time in this work. The characterization results of XRD and SEM demonstrated that Zn was successfully doped into SnO₂. The formed Sn-O-Zn bonds and interaction between the Zn-doped SnO₂ sample and g-C₃N₄ in the composite were explored by FT-IR and XPS technologies. Photocatalytic degradation experiments showed that the as-prepared optimal composite photocatalyst displayed enhanced photocatalytic reactivity towards both dyes and antibiotics, which could degrade 85.6% of RhB and 86.8% of tetracycline within 30 and 90 min, respectively. The oxygen vacancies formed in SnO₂ after Zn doping could capture the photogenerated electrons of g-C₃N₄, thereby promoting the separation of photogenerated electron-hole pairs, then more ·O₂⁻ and holes can be generated during the visible light-driven photocatalytic reaction, so that the composite of Zn-doped SnO₂/g-C₃N₄ acquired higher photocatalytic activity and accelerated the degradation of target organics. Active species capturing experiments and ESR detection results also confirmed that ·O₂⁻ and holes were the main active species in the reaction process. This work developed a novel g-C₃N₄-based photocatalyst with no noble metal, low price, and high photocatalytic activity, which could provide a cost-effective and high-efficiency strategy for wastewater treatment.
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