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Decolourization of Methylene Blue in Water Using Bentonite Impregnated with Ti and Ag as Photocatalyst
Author(s) -
Wu Edward MingYang,
Kuo ShuLung
Publication year - 2015
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14338845156902
Subject(s) - bentonite , photocatalysis , methylene blue , catalysis , titanium dioxide , degradation (telecommunications) , titanium , materials science , adsorption , nuclear chemistry , chemical engineering , chemistry , metallurgy , organic chemistry , telecommunications , computer science , engineering
This article used bentonite impregnated with titanium and silver, respectively, as photocatalyst, to degrade methylene blue (MB) under conditions of MB solutions exposed to sodium lamp and sunlight. Due to the semi‐conducting properties of synthesized bentonite catalysts, when exposed to sodium lamp and sunlight, catalyst particles are excited for photocatalysis to achieve decolourization. After an FT‐IR analysis, this study finds that smectite catalysts have significant and complicated wave crests between the fingerprint area with wave numbers 415~600 cm −1 and 750~1170 cm −1 . The bentonite impregnated with Ti 4+ (Sm‐Ti) and with Ag + (Sm‐Ag) removes MB through the mechanisms of adsorption and degradation, while the commercial product of titanium dioxide (TiO 2 ) only exhibits the capability of MB degradation. At present, a heterogeneous photocatalytic system has been fully applied for use in daily life, with its efficiency determined by the free radical action of electrons and holes, the generation efficiency of ·OH.