String and Ball-Like TiO_2/rGO Composites with High Photo-catalysis Degradation Capability for Methylene Blue  

作　　者：Fengyun Xu Ping Na 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University

出　　处：《Transactions of Tianjin University》2018年第3期272-281,共10页天津大学学报（英文版）

基　　金：supported by the National High Technology Research and Development Program of China ("863" Program, No. 2012AA063504);the National Natural Science Foundation of China (Nos. 21276193, 215111300020, 201405008, and U1407116);the Natural Science Foundation of Tianjin, China (No. 13JCZDJC35600)

摘　　要：Novelthree-dimensionalstring and ball-like titanium dioxide/reduced graphene oxide, TiO_2/rGO(STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermaltreatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO_2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removalrate of 86.0% for methylene blue and its reaction rate constant(5.27 × 10^(-3) min^(-1)) was much higher than those of pure string and ball-like TiO_2(ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which~?O_2^- and~·OH were the main oxidizing groups. This work of fers new insights into a better design and preparation of novelcomposite materials for the removalof organic dyes.Novelthree-dimensionalstring and ball-like titanium dioxide/reduced graphene oxide, TiO2/rGO（STG） composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermaltreatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removalrate of 86.0% for methylene blue and its reaction rate constant（5.27 × 10-3 min-1） was much higher than those of pure string and ball-like TiO2（ST）. In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which·O2- and·OH were the main oxidizing groups. This work of fers new insights into a better design and preparation of novelcomposite materials for the removalof organic dyes.

关 键 词：String and ball-like TiO2 Reduced graphene oxide Synergistic effect Photo-catalytic Methylene blue 

分 类 号：TB332[一般工业技术—材料科学与工程]