Photoelectrochemical degradation of 2,4-dichlorophenoxyacetic acid using electrochemically self-doped Blue TiO2 nanotube arrays with formic acid as electrolyte
Photoelectrochemical degradation of 2,4-dichlorophenoxyacetic acid using electrochemically self-doped Blue TiO2 nanotube arrays with formic acid as electrolyte
复制标题
以甲酸为电解质的电化学自掺杂蓝色TiO2纳米管阵列光电化学降解2,4-二氯苯氧基乙酸
DOI：
10.1016/j.jhazmat.2019.121096
复制
发表时间：
2020
影响因子：
13.6
通讯作者：
Ying Zhang
中科院分区：
文献类型：
--
作者：
Xin Xu;Jingju Cai;Minghua Zhou;Xuedong Du;Ying Zhang
Blue TiO2nanotube arrays (Blue-TNTs) were fabricated via an electrochemical reduction method with formic acid as the electrolyte. The optimum reduction conditions were obtained as bias potential of −1.3 V, reduction time of 5 min and formic acid of 3 M. Blue-TNTs were remarkably corroded compared with the intact TNTs. Similar crystal structures of the two catalysts were observed using X-ray diffraction, while red-shift was observed for Blue-TNTs using Raman spectra. X-ray photoelectron spectroscopy indicated of the presence of Ti3+in Blue-TNTs that resulted from the reduction of Ti4+and reduced the resistance of the catalyst. Blue-TNTs exhibited much stronger light-absorption than intact TNTs over the entire ultraviolet-visible region, especially in the visible region. The catalyst was used toward the photoelectrochemical oxidation of 2,4-dichlorophenoxyacetic acid (2,4-D) for the first time where the influencing factors were studied. Photoelectrocatalysis with Blue-TNTs presented a 2,4-D degradation rate constant (0.0295 min−1) more than twice the sum of that of electrocatalysis (0.0055 min−1) and photocatalysis (0.0089 min−1). Blue-TNTs fabricated in formic acid showed a better photoelectrocatalytic performance for 2,4-D removal compared with that prepared in ethylene glycol, Na2SO4and NaNO3solution. Blue-TNTs is considered to be a promising photoelectric anode for contaminant degradation.
