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Preparation and characterization of nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel and its application for removal of ionic dyes
- Source :
- Separation and Purification Technology. 176:193-199
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Nano-TiO 2 /chitosan/poly(N-isopropylacrylamide) (nano-TiO 2 /CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO 2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO 2 /CS/PNIPAAm composite hydrogel was characterized by FT-IR and SEM. The properties of dye adsorption and photocatalytic degradation were investigated. The results indicated that dye adsorption was strongly influenced by solution pH and the acid fuchsin (AF) removal rate was maximum at pH = 4. The dye removal rate decreased slightly with increasing temperature, and the composite hydrogel adsorbing AF dyes floated on the solution surface at 40 °C and could be readily removed from the aqueous solution. Kinetics analysis indicated that the dye adsorption by nano-TiO 2 /CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. Moreover, nano-TiO 2 /CS/PNIPAAm composite hydrogel exhibited high efficiency of photocatalytic degradation for AF dyes, and AF dye removal rate reached 90.5% under UV irradiation for 160 min.
- Subjects :
- Aqueous solution
Chemistry
Kinetics
Composite number
Filtration and Separation
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Acid fuchsin
0104 chemical sciences
Analytical Chemistry
Chitosan
chemistry.chemical_compound
Polymerization
Chemical engineering
Polymer chemistry
Photocatalysis
Poly(N-isopropylacrylamide)
0210 nano-technology
Subjects
Details
- ISSN :
- 13835866
- Volume :
- 176
- Database :
- OpenAIRE
- Journal :
- Separation and Purification Technology
- Accession number :
- edsair.doi...........00ad1b9c36c77a7bc2ed386e48012897