Open AccessPreparation of phosphotungstic acid/SiC and their photocatalytic activity for rhodamine B
Author(s) -
Li Pengxi,
Chen Qingcui,
Chen Benshou,
Liu Zhonghong
Publication year - 2020
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2019.0734
Subject(s) - phosphotungstic acid , photocatalysis , rhodamine b , photodegradation , materials science , scanning electron microscope , degradation (telecommunications) , reaction rate constant , nuclear chemistry , diffuse reflection , photochemistry , chemistry , catalysis , organic chemistry , kinetics , composite material , telecommunications , physics , quantum mechanics , computer science , optics
Four kinds of x wt.% phosphotungstic acid/silicon carbide (PTA/SiC) photocatalysts were prepared by impregnation method with SiC, 12‐phosphotungstic acid (PTA) as raw materials. The structure of samples was characterised by X‐ray diffraction, ultraviolet–visible diffuse reflectance spectra, scanning electron microscope. The photocatalytic activity of samples was evaluated by the degradation of rhodamine B (RhB) under a xenon lamp (λ≥420 nm). The results indicate that the photocatalysts not only maintained the SiC structure but also kept the Keggin structure of PTA. The 20 wt.% PTA/SiC exhibited the best photocatalytic degradation efficiency reaching up to 77% for 180 min irradiation, and the photo‐degradation rate constant was determined to be 7.82 × 10 −3 min −1 . In the presence of H 2 O 2 , the photocatalytic degradation rate of 20 wt.% PTA/SiC composites was increased to 87%, and the photodegradation reaction rate constant was 7.77 × 10 −3 min −1 . According to free radical trapping experiments, it is proved that hydroxyl radical (·OH) plays an important role in photocatalysis.