文献类型：期刊文献

英文题名：Highly recyclable and super-tough hydrogel mediated by dual-functional TiO2 nanoparticles toward efficient photodegradation of organic water pollutants

作者：Yue, Yiying[1] Wang, Xianhui[1] Wu, Qinglin[2] Han, Jingquan[3] Jiang, Jianchun[4,5]

第一作者：Yue, Yiying

通信作者：Han, JQ[1];Jiang, JC[2]

机构：[1]Nanjing Forestry Univ, Coll Biol & Environm, Nanjing 210037, Jiangsu, Peoples R China;[2]Louisiana State Univ Agr Ctr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA;[3]Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Jiangsu, Peoples R China;[4]Nanjing Forestry Univ, Coll Chem Engn, Nanjing 210037, Jiangsu, Peoples R China;[5]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China

年份：2020

卷号：564

起止页码：99-112

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000516097100011)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 31901274, 31770609), the Natural Science Foundation of Jiangsu Province for Outstanding Young Scholars (Grant No. BK20180090), the 333 Project Foundation of Jiangsu Province (Grant No. BRA2018337), the Natural Science Research Project of Jiangsu Province (Grant No. 17KJB220007), the Qing Lan Project of Jiangsu Province (2019) and the Analysis and Test Center of Nanjing Forestry University.

语种：英文

外文关键词：Hydrogel; TEMPO-oxidized chitin nanofiber; Mechanical strength; Photocatalytic performance; Reutilization

摘要：A novel photocatalytic hydrogel was prepared by loading TiO2 nanoparticles (TiO2 NPs) onto the surface of 2,2,6,6-tetramethylpiperidine-l-oxyl (TEMPO)-oxidized chitin nanofibers (TOCNs), which were further incorporated into the polyacrylamide (PAM) matrix. The resultant hydrogel exhibited a macro-porous structure with a low density (similar to 1.45 g/cm(3)) and high water content (similar to 80%). The well-dispersed TiO2 NPs not only acted as a crosslinking agent for bridging the three-dimensional porous network structure, but also endowed the hydrogel with good catalytic activity. After the introduction of TiO2 accounting for 10 wt% of the hydrogel mass, the hydrogels showed compressive strength of 1.46 MPa at 70% strain, tensile stress of 316 kPa, tensile strain of 310%, toughness of 47.25 kJ/m(3) and fatigue resistance. Compared with neat TOCN-PAM hydrogel, the uniaxial compressive and tensile strengths of the TiO2-TOCN-PAM10 hydrogel increased 6.35-fold and 3.70-fold, respectively. Furthermore, the removal of methyl orange (MO) was attributed to the synergistic effect of the adsorption and photocatalytic degradation of the hydrogels. The hydrogels adsorbed up to 8.5% of MO after 150 min of adsorption and a photocatalytic degradation rate of 97.3% achieved after 90 min of UV irradiation at pH = 2. Especially, the TiO2 -TOCN-PAM10 hydrogel exhibited excellent recycling performance: its MO removal efficiency was around 96% even after 10 reuse cycles. The as-prepared hydrogels, with characteristics of excellent stretchability, photocatalytic activity and recyclability, are expected to be used in alleviating organic pollutants in practical wastewater treatments. (C) 2019 Elsevier Inc. All rights reserved.