Machreki Manel, Chouki Takwa, Tyuliev Georgi, Žigon Dušan, Ohtani Bunsho, Loukanov Alexandre, Stefanov Plamen, Emin Saim
Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia.
Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, Sofia 1113, Bulgaria.
ACS Omega. 2023 Jun 7;8(24):21605-21617. doi: 10.1021/acsomega.3c00820. eCollection 2023 Jun 20.
Oxygen vacancies (OVs) are one of the most critical factors that enhance the electrical and catalytic characteristics of metal oxide-based photoelectrodes. In this work, a simple procedure was applied to prepare reduced TiO nanotube arrays (NTAs) (TiO) via a one-step reduction method using NaBH. A series of characterization techniques were used to study the structural, optical, and electronic properties of TiO NTAs. X-ray photoelectron spectroscopy confirmed the presence of defects in TiO NTAs. Photoacoustic measurements were used to estimate the electron-trap density in the NTAs. Photoelectrochemical studies show that the photocurrent density of TiO NTAs was nearly 3 times higher than that of pristine TiO. It was found that increasing OVs in TiO affects the surface recombination centers, enhances electrical conductivity, and improves charge transport. For the first time, a TiO photoanode was used in the photoelectrochemical (PEC) degradation of a textile dye (basic blue 41, B41) and ibuprofen (IBF) pharmaceutical using in situ generated reactive chlorine species (RCS). Liquid chromatography coupled with mass spectrometry was used to study the mechanisms for the degradation of B41 and IBF. Phytotoxicity tests of B41 and IBF solutions were performed using L. to evaluate the potential acute toxicity before and after the PEC treatment. The present work provides efficient PEC degradation of the B41 dye and IBF in the presence of RCS without generating harmful products.
氧空位（OVs）是增强基于金属氧化物的光电极的电学和催化特性的最关键因素之一。在这项工作中，采用了一种简单的方法，通过使用硼氢化钠的一步还原法制备还原型二氧化钛纳米管阵列（NTAs）（TiO）。使用了一系列表征技术来研究TiO NTAs的结构、光学和电子性质。X射线光电子能谱证实了TiO NTAs中存在缺陷。光声测量用于估计NTAs中的电子陷阱密度。光电化学研究表明，TiO NTAs的光电流密度比原始TiO高出近3倍。研究发现，TiO中氧空位的增加会影响表面复合中心，提高电导率，并改善电荷传输。首次将TiO光阳极用于利用原位生成的活性氯物种（RCS）对纺织染料（碱性蓝41，B41）和布洛芬（IBF）药物进行光电化学（PEC）降解。采用液相色谱-质谱联用技术研究B41和IBF的降解机理。使用生菜对B41和IBF溶液进行植物毒性测试，以评估PEC处理前后的潜在急性毒性。目前的工作提供了在存在RCS的情况下对B41染料和IBF进行高效的PEC降解，且不产生有害产物。
