Open AccessPhotocatalytic degradation of methyl orange by Bi 20 TiO 32 –montmorillonite composite
Author(s) -
Xiang Haichun,
Tuo Biyang,
Song Xiang
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.2020.0127
Subject(s) - photocatalysis , montmorillonite , methyl orange , composite number , materials science , anatase , degradation (telecommunications) , photodegradation , nuclear chemistry , radical , chemical engineering , composite material , catalysis , chemistry , organic chemistry , telecommunications , computer science , engineering
To solve the problem of methyl orange (MO) dye wastewater pollution, TiO 2 –montmorillonite composite (TiO 2 –MMT) and Bi 20 TiO 32 –montmorillonite composite (Bi 20 TiO 32 –MMT) were synthesised by the sol–gel method, and they were used for photocatalytic degradation of MO solution. The results showed that TiO 2 in TiO 2 –MMT existed as the anatase type, and Bi 20 TiO 32 in Bi 20 TiO 32 –MMT existed as the tetragonal crystal type. When the dosage of the composite was 0.50 g/l, the initial concentration of the MO solution was 20 mg/l, and the pH was 3, the decolourisation rate of MO solution using TiO 2 –MMT treating was 87.11%, and it reached 98.50% after Bi 20 TiO 32 –MMT treating. When Bi 20 TiO 32 –MMT was reused four times, the decolourisation rate of the MO solution was only reduced by 3.5%. The photocatalytic degradation between MO solution and Bi 20 TiO 32 –MMT complied with the pseudo‐first‐order kinetic equation. Holes and superoxide radicals interacted directly with MO during photocatalytic degradation, which reduced the probability of hole–electron recombination, and improved the photocatalytic degradation property of Bi 20 TiO 32 –MMT. Bi 20 TiO 32 –MMT has excellent stability property, which makes it a good composite in the treatment of dye wastewater.