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Phosphotungstic acid/silicon carbide nanowire heterostructure photocatalyst for improving photodegradation of Rhodamine B

PENGXI LI1, ZHONGHONG LIU1, ZIQIZO XIA1, JINGJING YANG1,*

Affiliation

  1. Environment and Quality Test Department, Chongqing Chemical Industry Vocational College, Chongqing, 401228, P. R. China

Abstract

Four different ratios of phosphotungstic acid (HPW)-silicon carbide (SiC) nanowire photocatalysts were obtained by the impregnation method, wherein HPW and SiC nanowires were the raw materials. The photocatalytic degradation performance of the synthesized photocatalysts was investigated using Rhodamine B (RhB) as the degradation substrate. The HPW/SiC nanowire composites with a 40 wt.% of HPW exhibited the best photocatalytic degradation performance; the photodegradation rate of the RhB was 82% after 240 min of irradiation, with a photodegradation rate constant of 5.07×10-3 min-1 . The results of the research conducted on the photocatalytic degradation mechanism showed that ·OH and ·O2 - were the main reactive species in the degradation reaction of RhB, with ·OH radicals playing a dominant role. The proposed HPW-SiC nanowire–photocatalytic material has the advantages of being low-cost, environmentally friendly, and highly efficient; additionally, it has great potential as a photocatalyst in the degradation of printing and dyeing wastewater.

Keywords

Phosphotungstic acid-SiC nanowires, Photodegradation, Rhodamine B, Heterostructure.

Citation

PENGXI LI, ZHONGHONG LIU, ZIQIZO XIA, JINGJING YANG, Phosphotungstic acid/silicon carbide nanowire heterostructure photocatalyst for improving photodegradation of Rhodamine B, Optoelectronics and Advanced Materials - Rapid Communications, 17, 3-4, March-April 2023, pp.170-176 (2023).

Submitted at: Sept. 8, 2022

Accepted at: April 7, 2023