Preparation and characterization of nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel and its application for removal of ionic dyes

•Nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel was prepared by a two-step polymerization method.•Nano-TiO2 was used to give the photocatalytic activity of the composite hydrogel.•The composite hydrogel exhibited high efficiency of acid fuchsin dye removal rate under UV irradiatio...

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Veröffentlicht in:Separation and purification technology 2017-04, Vol.176, p.193-199
Hauptverfasser: Zhou, Jianhua, Hao, Bianzhi, Wang, Linben, Ma, Jianzhong, Cheng, Wenjing
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creator Zhou, Jianhua
Hao, Bianzhi
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Ma, Jianzhong
Cheng, Wenjing
description •Nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel was prepared by a two-step polymerization method.•Nano-TiO2 was used to give the photocatalytic activity of the composite hydrogel.•The composite hydrogel exhibited high efficiency of acid fuchsin dye removal rate under UV irradiation. Nano-TiO2/chitosan/poly(N-isopropylacrylamide) (nano-TiO2/CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO2/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-TiO2/CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. Moreover, nano-TiO2/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 160min.
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Nano-TiO2/chitosan/poly(N-isopropylacrylamide) (nano-TiO2/CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO2/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-TiO2/CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. 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Nano-TiO2/chitosan/poly(N-isopropylacrylamide) (nano-TiO2/CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO2/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-TiO2/CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. 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Nano-TiO2/chitosan/poly(N-isopropylacrylamide) (nano-TiO2/CS/PNIPAAm) composite hydrogel was prepared by a two-step polymerization method, and nano-TiO2 can endow the composite hydrogel with photocatalytic activity. The nano-TiO2/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-TiO2/CS/PNIPAAm composite hydrogel conformed to pseudo-second order model. 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source ScienceDirect Journals (5 years ago - present)
subjects Acid fuchsin
Adsorption
Chitosan
Composite hydrogel
Degradation
Dyes
Hydrogels
Nano-TiO2
Nanostructure
Photocatalysis
Photocatalytic activity
Poly(N-isopropylacrylamide)
Surface chemistry
title Preparation and characterization of nano-TiO2/chitosan/poly(N-isopropylacrylamide) composite hydrogel and its application for removal of ionic dyes
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