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Journal of Nanomaterials
Volume 2015 (2015), Article ID 675862, 8 pages
http://dx.doi.org/10.1155/2015/675862
Research Article

Enhanced Adsorption and Removal of Ciprofloxacin on Regenerable Long TiO2 Nanotube/Graphene Oxide Hydrogel Adsorbents

Yuan Zhuang,1 Fei Yu,2,3 and Jie Ma1,4

1State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
2Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, 26 Jinjing Road, Tianjin 300384, China
3College of Chemistry and Environmental Engineering, Shanghai Institute of Technology, Shanghai 2001418, China
4Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, China

Received 24 October 2015; Accepted 26 November 2015

Academic Editor: Bao Yu Xia

Copyright © 2015 Yuan Zhuang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To improve the adsorption performance and regeneration ability of adsorbent, a simple method was designed to synthesize long TiO2 nanotube/reduced graphene oxide (rGO-TON) hydrogel, which has good adsorption and regeneration capacity toward ciprofloxacin. rGO-TON hydrogel could form 3D structure, which makes the separation and regeneration of adsorbent easy. For comparison, commercial P25 particle is used to prepare composite hydrogel with rGO; the results showed that TiO2 nanotube supports the graphene sheets better than P25 particles, which would reduce the agglomeration of graphene sheets. rGO-TON have larger specific surface area (138.2 m2/g) than rGO-P25 (79.4 m2/g). In this paper, ciprofloxacin was chosen as target pollutants, the rGO-TON obtain excellent adsorption capacity, and the maximum adsorption capacities of rGO-TON for ciprofloxacin calculated from Langmuir model are 178.6 mg/g (), 181.8 mg/g (), and 108.7 mg/g () for graphene oxide (GO), GO-TON, and GO-P25, respectively. In regeneration, the adsorption capacity of rGO-TON and rGO-P25 has little reduced after 5 cycles, while the adsorption capacity of rGO decreases to below 100 mg/g. Results of this work are of great significance for environmental applications of regenerable long TiO2 nanotube/graphene oxide hydrogel as a promising adsorbent nanomaterial for antibiotic pollutants from aqueous solutions.