Enhanced Adsorption of Methyl Orange onto Self-assembled Hydrogel with Anatase Titania Nanotube and Graphene

• Published in: 东华大学学报（英文版） Vol. 34; no. 2; pp. 262 - 268
• Main Author: 韩玉娟 郑凯 戴荣 周子宁 张长飞 韩永忠 刘福强
• Format: Journal Article
• Language: English
• Published: Mechanical and Electrical Engineering Department, Huai'an Senior Vocational & Technical School, Huai'an 223005, China%Department of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China%State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, China 30.04.2017
• Subjects: adsorption; TiO2 nanotubes (TN); graphene oxide(GO); hydrogel; methyl orange(MO); photolysis
• ISSN: 1672-5220

A novel composites hydrogel adsorbent was facilely synthesized for efficient removal of acid dyes from aqueous solution.The composite hydrogel consisting of TiO2 nanotubes（TN） and graphene oxide（GO）（H-TN-GO） was characterized by BrunauerEmmett-Teller（BET）,transmission electron microscope（TEM）,scanning electron microscope（SEM）,Raman spectra and X-ray photoelectron spectroscope（XPS）.Experimental results elucidated that columnar hydrogel could be tunably prepared with self-assembly by adjusting the proportion of GO/TN,mixing time and pH.The properties of adsorption and regeneration on methyl orange（MO）onto H-TN-GO were investigated respectively.The maximal adsorption capacity of H-TN-GO for MO reached 933.8 and 513.7mg/g under the pH of 4.0 and 6.8,respectively.The adsorption capacity of MO reached the maximum when pH was equivalent to4.0,which attributed to increasing electrostatic attraction.Besides,the adsorption behavior was fitted reasonably better with Freundlich isotherm model than Langmuir model;the adsorption speed was rapid and the removal ratio almost reached 99.5% when the concentration of MO was less than 100 mg/L.After the used adsorbent was irradiated with the ultraviolet ray of 500 W for 3 h,its adsorption capacity could be recovered without significant loss.