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|title: ||Adsorption and catalytic properties of SiO2/Bi2S3 nanocomposites on the methylene blue photodecolorization process|
|authors: ||Albuquerque, Rita|
Neves, Márcia C.
Mendonça, Maria H.
Monteiro, Olinda C.
|keywords: ||Methylene blue|
|issue date: ||Oct-2008|
|abstract: ||The decolorization of aqueous solutionsmethylene blue (C.I. Basic Blue 9), due to the presence of nanocrystalline
Bi2S3, supported on SiO2 submicron particles,was investigated here. For this decolorization process,
two distinct characteristics, though related, associated to the role of SiO2/Bi2S3 were identified: (i) high
methylene blue adsorption capability and (ii) photocatalytic activity to methylene blue photodecolorization.
Effects of experimental parameters on the decolorization process, such as methylene blue and
nanocomposite concentrations, pH and Bi2S3 particle size were investigated. The maximum adsorption
ability of the SiO2/Bi2S3 was approximately 15.6mg methylene blue per gram. The complete decolorization
of a 16ppm organic dye solution can be achieved, by an adsorption process, in an extremely short
time (less than 5 min), using 1.6 g/L of SiO2/Bi2S3 nanocomposite. The study of the decolorization of the
dye by an adsorption–photoassisted decolorization processwas carried out by irradiation of a suspension
prepared with 100mL of methylene blue solution (8 ppm) and 50mg of SiO2/Bi2S3. In these conditions
the complete decolorization of the dye, adsorbed and in the solution, was achieved in 40 min.|
|source: ||Colloids and surfaces A: physicochemical and engineering aspects|
|appears in collections||DQ - Artigos|
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