Dual-functional UiO-66/g-C3N4 composites for photocatalytic pesticide removal and in situ adsorption of phosphate byproducts in water

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-10-29 DOI:10.1002/jctb.7773

Jinyun Song, Runying Bai, Bo Wu, Ruzhuang Zhang, Yuchao Yang, Yi Ding, Hexin Zhu, Haoxiang Yang, Siyu Zhao

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引用次数: 0

Abstract

BACKGROUND

With the increasing global demand for food, a significant amount of organophosphorus pesticides is applied to farmland, leading to pollution as they are discharged into natural water bodies with agricultural runoff. This study employed a coupling approach, utilizing a 6:4 mass ratio of zirconium-based metal–organic framework UiO-66 and g-C₃N₄ through a grinding and annealing method to construct a Z-type heterojunction composite material named UG 6:4.

RESULTS

This material is employed for photocatalytic removal of the representative organophosphorus pesticide, dichlorvos (DDVP), from water and simultaneous in situ adsorption of its inorganic phosphorus byproducts. Results demonstrate that for initial DDVP concentrations below 5 mg L⁻¹ (calculated as total phosphorus), both the mineralization rate under ultraviolet light irradiation with a wavelength of 365 nm and a power of 125 W and the adsorption rate of phosphorus were 100% when the pH was 6 and the UG 6:4 dosage was 0.2 g L⁻¹. The sheet-like g-C₃N₄ tightly envelops the surface of UiO-66, forming a Z-scheme heterojunction. This structure imparts UG 6:4 with enhanced light absorption, faster generation and separation of photogenerated electron–hole pairs compared to individual UiO-66 or g-C₃N₄, and the establishment of an internal electric field suppresses the recombination of photogenerated charge carriers.

CONCLUSION

Consequently, UG 6:4 exhibits outstanding photocatalytic pesticide removal capabilities. Furthermore, UG 6:4 demonstrates specific adsorption of inorganic phosphorus through electrostatic attraction and ligand exchange. This study indicates that UG 6:4 is a promising dual-functional photocatalytic adsorbent with excellent application prospects. © 2024 Society of Chemical Industry (SCI).

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双功能UiO-66/g-C3N4复合材料光催化除农药及水中磷酸盐副产物的原位吸附

随着全球粮食需求的增加，大量有机磷农药被施用于农田，随着农业径流排放到自然水体中，造成污染。本研究采用耦合的方法，利用锆基金属-有机骨架uuo -66和g-C3N4的质量比为6:4，通过研磨退火的方法构建了一种名为UG 6:4的z型异质结复合材料。结果该材料可用于光催化去除水中代表性有机磷农药敌敌畏（DDVP），同时对其副产物无机磷进行原位吸附。结果表明，当初始DDVP浓度低于5 mg L−1（以总磷计）时，当pH = 6、UG 6:4用量为0.2 g L−1时，波长为365 nm、功率为125 W的紫外光照射下的矿化率和磷的吸附率均为100%。片状g-C3N4紧密包裹UiO-66表面，形成z型异质结。与单个UiO-66或g-C3N4相比，这种结构使UG 6:4具有增强的光吸收，光生电子-空穴对的产生和分离更快，并且内部电场的建立抑制了光生载流子的重组。结论UG 6:4具有良好的光催化农药去除能力。此外，UG 6:4显示了无机磷通过静电吸引和配体交换的特异性吸附。本研究表明UG 6:4是一种很有前途的双功能光催化吸附剂，具有良好的应用前景。©2024化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.