Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 174, Issue -, Pages 52-60Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.01.077
Keywords
Chitosan; Hydrogel; Photocatalysis; CdS; ZnO; Congo red
Funding
- National Natural Science Foundation of China [51208331]
- Natural Science Foundation of Zhejiang Province, China [LTY21B070001, LY15E080002]
- Science Foundation of Taizhou University for Distinguished Young Scholars [2018JQ001]
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In this study, a colloidal CdS sensitized nano-ZnO/chitosan hydrogel was prepared and evaluated for the photodegradation of congo red under solar light irradiation. The CdS@n-ZnO/CS hydrogel showed excellent performance in CR removal, indicating its potential application in practical wastewater treatment. The synergistic effect of adsorption by chitosan and photocatalysis by ZnO and CdS contributed to the high efficiency of CR removal by CdS@n-ZnO/CS.
Colloidal CdS sensitized nano-ZnO/chitosan (CdS@n-ZnO/CS) hydrogel was prepared and characterized extensively by XRD. SEM-EDS, TEM, UV-Vis DRS, FT-IR and TGA. The photocatalytic activity of CdS@n-ZnO/CS was evaluated with the photodegradation of congo red (CR) as an organic pollutant under solar light irradiation. The influences of initial dye concentration, catalyst dosage, recycling runs, and radical scavenger on decolorization of CR by CdS@n-ZnO/CS were investigated. 95% of CR was removed in just 1 min for 5.0 mg L-1 and 94.34% of CR was removed in 30 min for 100 mg L-1. CdS@n-ZnO/CS exhibited an excellent and ultra-fast performance toward CR removal under solar light due to the synergistic effect of adsorption by chitosan and photocatalysis by ZnO and CdS in CdS@n-ZnO/CS hydrogel. Radical trapping control experiments indicated that h(+) and O-2 center dot(-) played the major role for CR decolorization. The high performance of CdS@n-ZnO/CS hydrogel was also demonstrated under natural solar light irradiation, suggesting that CdS@n-ZnO/CS hydrogel could be used in practical wastewater treatment. (C) 2021 Elsevier B.V. All rights reserved.
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