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author:

Fan, Gongduan (Fan, Gongduan.) [1] (Scholars:范功端) | Du, Banghao (Du, Banghao.) [2] | Zhou, Jinjin (Zhou, Jinjin.) [3] | Yan, Zhongsen (Yan, Zhongsen.) [4] | You, Yifan (You, Yifan.) [5] | Luo, Jing (Luo, Jing.) [6]

Indexed by:

EI

Abstract:

The practical application of photocatalytic technology in the natural water body is limited by the low reuse capability and potential secondary pollution risk of powder catalysts. Consequently, it is highly desirable to develop the stable floating photocatalytic composites for efficient alleviating harmful algal blooms. In this study, the self-floating Ag2O/g-C3N4/hydrogel composites with a porous three-dimension (3D) network nanostructure via the cross-linking of chitosan and polyvinyl alcohol have been synthesized. The effects of doping load, initial algal density and dissolved organic matter on Microcystis aeruginosa (M. aeruginosa) removal were investigated by Ag2O/g-C3N4/hydrogel under visible light irradiation. Among the synthesized photocatalysts, the 20-Ag2O/g-C3N4/hydrogel showed the highest adsorption, good reusability performance and excellent photocatalytic activity within 4 h for the removal of M. aeruginosa. Algal cell membrane and phycobiliprotein were severely damaged during the photocatalytic process. The inactivation mechanisms are attributed to the water-adsorbing swelling of the hydrogel and the generated reactive oxygen species (mainly ·O2− and ·OH) by Ag2O/g-C3N4. Moreover, the antioxidant system of the algae cells was also collapsed under the effects of reactive oxygen species. The superoxide dismutase (SOD) and catalase (CAT) content of algal cells decreased rapidly after photocatalytic reaction by Ag2O/g-C3N4/hydrogel, while the malondialdehyde (MDA) activity was higher than that of the control group. The self-floating Ag2O/g-C3N4/hydrogel photocatalyst would have real practical applications for harmful algae in the fields of natural water body. © 2020 Elsevier B.V.

Keyword:

Algae Bacteria Cytology Enzymes Hydrogels Light Photocatalytic activity Reactive oxygen species Reusability Silver oxides Water conservation Water pollution

Community:

  • [ 1 ] [Fan, Gongduan]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 2 ] [Fan, Gongduan]State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fujian; 350002, China
  • [ 3 ] [Fan, Gongduan]Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fujian; 350002, China
  • [ 4 ] [Du, Banghao]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 5 ] [Zhou, Jinjin]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 6 ] [Yan, Zhongsen]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 7 ] [Yan, Zhongsen]State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fujian; 350002, China
  • [ 8 ] [You, Yifan]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 9 ] [Luo, Jing]College of Civil Engineering, Fuzhou University, Fujian; 350116, China
  • [ 10 ] [Luo, Jing]Fujian Jinhuang Environmental Sci-Tech Co., Ltd, Fujian; 350002, China

Reprint 's Address:

  • 范功端

    [fan, gongduan]state key laboratory of photocatalysis on energy and environment, fuzhou university, fujian; 350002, china;;[fan, gongduan]college of civil engineering, fuzhou university, fujian; 350116, china;;[fan, gongduan]fujian provincial key laboratory of electrochemical energy storage materials, fuzhou university, fujian; 350002, china

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Source :

Chemical Engineering Journal

ISSN: 1385-8947

Year: 2021

Volume: 404

1 6 . 7 4 4

JCR@2021

1 3 . 4 0 0

JCR@2023

ESI HC Threshold:105

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 68

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 4

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