High efficiency of CQDs/UiO-66 photocatalytic nanocomposite for degradation of RR-195 under visible irradiation

Nguyen Thi Phuong Lan; Nguyen Thi Hong Van; Duong Thi Thuy Trang; Pham Xuan Nui

doi:10.62239/jca.2024.065

Authors

Nguyen Thi Phuong Lan Faculty of Applied Sciences, University of Economics-Technology for Industries, 456-Minh Khai, Vinh Tuy, Hai Ba Trung, Hanoi, Vietnam. Author
Nguyen Thi Hong Van Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam | Institute of Environment, Vietnam Maritime University, 484 Lach Tray, Le Chan, Hai Phong, Vietnam Author
Duong Thi Thuy Trang Department of Chemical Engineering, Hanoi University of Mining and Geology, 18-Pho Vien, Duc Thang, Bac Tu Liem District, Hanoi, Vietnam. Author
Pham Xuan Nui Department of Chemical Engineering, Hanoi University of Mining and Geology, 18-Pho Vien, Duc Thang, Bac Tu Liem District, Hanoi, Vietnam. Author

DOI:

https://doi.org/10.62239/jca.2024.065

Keywords:

CQDs, UiO-66, degradation, RR-195, photocatalyst, nanocomposite

Abstract

CQDs, characteristically quasispheroidal carbon nanoparticles composed of amorphous to crystalline carbon base, are a prospective semiconductor quantum dots owing to its excellent optical absorptivity, chemical stability, nontoxicity, and facile synthesis. In this study, we demonstrated the impregnation method to integrate CQDs, formed from chitosan with UiO-66 from terephthalic acid recycled by waste PET to synthesize CQDs@UiO-66 nanocomposite. After the hybridization of CQDs with UiO-66, the low band gap energy of the CQDs@UiO-66 sample was determined at 2.4 eV, allowed the demonstration of photocatalytic activity under high visible light. This material was tested in the photodegradation of RR-195 dye and compared with the pristine components. The highest RR-195 degradation efficiency recorded when using the catalyst mass of 50 mg, dye concentration of 70 ppm after 4 h under visible light irradiation was 96% and the result rather maintained its performance (86,4%) after four cycles. These results could promote a new material circularity pathway to develop new semiconductors that can be used to protect water from further pollution.

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