利用废塑料中的对苯二甲酸合成 UiO-66/g-C3N4 复合材料用于光催化降解化学战剂模拟物甲基对氧磷,RSC Advances

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利用废塑料中的对苯二甲酸合成 UiO-66/g-C3N4 复合材料用于光催化降解化学战剂模拟物甲基对氧磷
RSC Advances ( IF 3.9 ) Pub Date : 2022-08-10 , DOI: 10.1039/d2ra03483b
Dung Van Le _{1,

2} , Manh B Nguyen ₃ , Phuong T Dang ₃ , Taeyoon Lee ₄ , Trinh Duy Nguyen _{1,

5}

Affiliation

在我们的研究中，使用从废塑料中获得的对苯二甲酸合成了基于 Zr 的 UiO-66 (Zr)。此后，采用溶剂热法制备了UiO-66/gC ₃ N ₄复合材料，并对其光催化降解化学战剂模拟物4-硝基苯磷酸二甲酯（DMNP）进行了光催化活性评价。合成后的UiO-66/gC ₃ N ₄表现出高表面积（1440 m ² g ^-1）和高毛细管体积（1.49 cm ³ g ^-1）。UiO-66/gC ₃ N ₄样品吸收了带隙能量为 2.13-2.88 eV 的可见光带。合成后的 UiO-66/gC在可见光照射下，₃ N₄复合材料在pH 7 下表现出高效降解DMNP，半衰期短（ t _{1/2为2.17 min）。}捕获实验证实h⁺和˙O₂^-自由基在DMNP的光催化降解中起重要作用。UiO-66/gC₃ N₄催化剂同时进行了两个过程：DMNP在水中的水解和光催化氧化。在辐照过程中，UiO-66 和 gC₃ N_{4之间的 ap-n 异质结}限制了光生电子和空穴的复合，从而提高了 DMNP 的降解速率。

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Synthesis of a UiO-66/g-C3N4 composite using terephthalic acid obtained from waste plastic for the photocatalytic degradation of the chemical warfare agent simulant, methyl paraoxon

In our study, Zr-based UiO-66 (Zr) was synthesized using terephthalic acid obtained from waste plastic. Thereafter, UiO-66/g-C₃N₄ composites were prepared by the solvothermal method, and their photocatalytic activity in the photodegradation of the chemical warfare agent simulant, dimethyl 4-nitrophenyl phosphate (DMNP), was evaluated. The as-synthesized UiO-66/g-C₃N₄ exhibited a high surface area (1440 m² g⁻¹) and a high capillary volume (1.49 cm³ g⁻¹). The UiO-66/g-C₃N₄ samples absorbed a visible light band with bandgap energies of 2.13–2.88 eV. The as-synthesized UiO-66/g-C₃N₄ composites exhibited highly efficient degradation of DMNP with a short half-life (t_1/2 of 2.17 min) at pH 7 under visible light irradiation. The trapping experiments confirmed that the h⁺ and ˙O₂⁻ radicals played an important role in the photocatalytic degradation of DMNP. The UiO-66/g-C₃N₄ catalyst simultaneously performed two processes: the hydrolysis and photocatalytic oxidation of DMNP in water. During irradiation, a p–n heterojunction between UiO-66 and g-C₃N₄ restricted the recombination of photogenerated electrons and holes, resulting in the enhancement in the degradation rate of DMNP.

更新日期：2022-08-10

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