Highly dispersed CeO₂ on TiO₂ nanotube: a synergistic nanocomposite with superior peroxidase-like activity

ACS Applied Materials & Interfaces
Hui ZhaoJingjing Zhang

Abstract

In this report, a novel nanocomposite of highly dispersed CeO2 on a TiO2 nanotube was designed and proposed as a peroxidase-like mimic. The best peroxidase-like activity was obtained for the CeO2/nanotube-TiO2 when the molar ratio of Ce/Ti was 0.1, which was much higher than that for CeO2/nanowire-TiO2, CeO2/nanorod-TiO2, or CeO2/nanoparticle-TiO2 with a similar molar ratio of Ce/Ti. Moreover, in comparison with other nanomaterial based peroxidase mimics, CeO2/nanotube-TiO2 nanocomposites exhibited higher affinity to H2O2 and 3,3',5,5'-tetramethylbenzidine (TMB). Kinetic analysis indicated that the catalytic behavior was in accordance with typical Michaelis-Menten kinetics. Ce(3+) sites were confirmed as the catalytic active sites for the catalytic reaction. The first interaction of surface CeO2 with H2O2 chemically changed the surface state of CeO2 by transforming Ce(3+) sites into surface peroxide species causing adsorbed TMB oxidation. Compared with CeO2/nanowire-TiO2, CeO2/nanorod-TiO2, and CeO2/nanoparticle-TiO2, the combination of TiO2 nanotube with CeO2 presented the highest concentration of Ce(3+) thus leading to the best peroxidase-like activity. On the basis of the high activity of CeO2/nanotube-TiO2, the reaction pro...Continue Reading

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Citations

Dec 17, 2015·ACS Applied Materials & Interfaces·Zhaoyin WangZhihui Dai
Nov 10, 2015·Journal of Colloid and Interface Science·Shuang CaoZhongbiao Wu
Jun 12, 2016·Materials Science & Engineering. C, Materials for Biological Applications·Yanyuan DingQingyun Liu
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Aug 10, 2016·ACS Applied Materials & Interfaces·Anjani P Nagvenkar, Aharon Gedanken
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Jul 1, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xiaodan ZhangYuming Huang
Nov 14, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Wenying LiYue-Qing Zheng
Jun 14, 2016·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Deshetti JampaiahSuresh K Bhargava
Jan 7, 2016·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Linjing SuFanggui Ye
Dec 8, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Lihong WuGuizhen Wang
Jan 7, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Fauzan AmriBrian Yuliarto
Oct 15, 2020·Chemical Engineering Journal·Feng WeiXiaojun Han
Feb 6, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Yuzhen LiYan-Yan Song
Nov 15, 2020·Chemical Communications : Chem Comm·Zhiyuan WeiXiaohu Xia
Apr 11, 2018·Materials Science & Engineering. C, Materials for Biological Applications·Aditi PandeyKantesh Balani
Apr 29, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Ying ZhuYuxiang Bu
May 30, 2021·International Journal of Biological Macromolecules·Supratim ChakrabortyDibyendu Mondal

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