Enhanced visible light photocatalytic degradation of dyes in aqueous solution activated by HKUST-1: performance and mechanism.

Autor: Zhang J; School of Environmental Studies, China University of Geosciences Wuhan 430074 China chl.su@cug.edu.cn +86-27-87481030 +86-27-67883170., Su C; School of Environmental Studies, China University of Geosciences Wuhan 430074 China chl.su@cug.edu.cn +86-27-87481030 +86-27-67883170., Xie X; School of Environmental Studies, China University of Geosciences Wuhan 430074 China chl.su@cug.edu.cn +86-27-87481030 +86-27-67883170., Liu P; School of Environmental Studies, China University of Geosciences Wuhan 430074 China chl.su@cug.edu.cn +86-27-87481030 +86-27-67883170., Huq ME; State Key Laboratory for Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University Wuhan 430079 China.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2020 Oct 07; Vol. 10 (61), pp. 37028-37034. Date of Electronic Publication: 2020 Oct 07 (Print Publication: 2020).
DOI: 10.1039/d0ra05275b
Abstrakt: HKUST-1 is a copper-based metal-organic framework (MOF) and potential photocatalyst, but minimal research has addressed the performance and mechanism of HKUST-1 in the visible light photocatalytic degradation of dyes. In the present work, HKUST-1 was applied as a photocatalyst to activate peroxomonosulfate (PMS) under visible light (Vis) for dye removal in aqueous solution. The results showed that the removal efficiency of two cationic dyes [rhodamine B (RhB) and methylene blue (MB)] was greater than 95% within 120 min. Free radicals such as SO 4 - ˙, ·OH were present in the degradation process, with SO 4 - ˙ playing a dominant role. Zeta potential, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy data were used to investigate the degradation mechanism. In the degradation process, surface charge attraction between HKUST-1 and cationic dyes promotes removal efficiency, with the degradation efficiency of cationic dyes (MB and RhB) more than 50% higher than for anionic dyes [acid orange 7 (AO 7 ) and methyl red (MR)]. On the other hand, HKUST-1 has been proved to activate PMS by conducting photoelectrons, which accelerated the degradation of dyes. Compared with the reaction conditions of PMS/Vis, when the HKUST-1 was present (HKUST-1/PMS/Vis), the degradation rates of MB and RhB increased by 62.7 and 63.2%, respectively.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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