南京理工大学张树鹏研究组分享 http://blog.sciencenet.cn/u/shupeng2009

博文

张树鹏老师合作文章在Chemosphere发表

已有 712 次阅读 2019-4-15 17:31 |个人分类:点滴成果|系统分类:论文交流

Self-doped TiO2 nanotube arrays for electrochemical mineralization of phenols

Ling Gan, Yifan Wu, Haiou Song, Chang Lu, Shupeng Zhang, Aimin Li

Author links open overlay panel

Abstract

Self-doped TiO2 nanotube arrays (DNTA) were prepared for the electrooxidation of resistant organics. The anatase TiO2 NTAs had an improved carrier density and conductivity from Ti3+ doping, and the oxygen-evolution potential remained at a high value of 2.48 V versus the standard hydrogen electrode, and thus, achieved a highly enhanced removal efficiency of phenol. The second anodization could stabilize Ti3+ and improve the performance by removing surface TiO2 particles. Improper preparation parameters (i.e., a short anodization time, a high calcination temperature and cathodization current density) harmed the electrooxidation activity. Although boron-doped diamond (BDD) anodes performed best in removing phenol, DNTA exhibited a higher mineralization of phenol than Pt/Ti and BDD at 120 min because intermediates were oxidized once they are produced with DNTA. Mechanism investigations using reagents such as tert-butanol, oxalic acid, terephthalic acid, and coumarinshowed that the DNTA mineralization resulted mainly from surface-bound OH, and the DNTA produced more than twice the amount of OH compared with BDD. The free OH on the BDD electrode was more conducive to initial substrate oxidation, whereas the adsorbed OH on the DNTA electrode mineralized the organics in situ. The preferential removal of p-substituted phenols on DNTA was attributed mainly to their electromigration and the aromatic intermediates that are hydrophobic were beneficial to mineralization.


1-s2.0-S0045653519305818-fx1_lrg.jpg




http://blog.sciencenet.cn/blog-311896-1173459.html

上一篇:祝贺马闯同学被评为2019届优秀硕士毕业研究生
下一篇:张树鹏老师在《南京理工大学报》发表求是评论文章

0

该博文允许注册用户评论 请点击登录 评论 (0 个评论)

数据加载中...

Archiver|手机版|科学网 ( 京ICP备14006957 )

GMT+8, 2019-10-18 07:57

Powered by ScienceNet.cn

Copyright © 2007- 中国科学报社

返回顶部