Improving the catalytic performance of TiO2 by its surface deposition on CNT buckypapers for use in the removal of wastewater pollutants

IF 5.7 3区材料科学 Q2 Materials Science

New Carbon Materials Pub Date : 2025-04-01 DOI:10.1016/S1872-5805(25)60966-8

Baratta Mariafrancesca , Vladimirovich Nezhdanov Aleksey , Valentinovich Ershov Aleksey , Aiello Donatella , Napoli Anna , Di Donna Leonardo , Ivanovic Mashin Alexandr , Pasquale Nicoletta Fiore , De Filpo Giovanni

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Abstract

Buckypapers (BPs) consist of carbon nanotube (CNT) membranes with good mechanical, thermal and electrical properties. We report the modification of CNT buckypapers by the surface deposition of a thin layer of titanium dioxide and their subsequent photocatalytic use for the removal of three wastewater pollutants: diclofenac (DF), carbofuran (CB) and methylene blue (MB). The results show the following decreases (RE) in the initial concentrations of these pollutants, RE_DF=99.5%, RE_MB=96% and RE_CB=90% after 90 min of exposure to UV-Vis radiation using 0.6 mg of photocatalyst. Experiments also showed that the degradation rate of diclofenac (k = 0.1028 min⁻¹) is respectively 3.5 and 6 times faster than the values for CB (k = 0.0298 min⁻¹) and MB (k = 0.0174 min⁻¹), probably due to the easier bond cleavage in DF. UV-Vis irradiated solutions of these pollutants were then analyzed by mass spectrometry to identify the species formed during photocatalysis and suggest possible degradation paths for MB, DF, and CB. Data showed that the degradation of DF involves the formation of a photocyclization product through loss of HCl molecule, clearly consuming less energy than that needed for the opening of the central aromatic ring in MB, or the loss of the N-methyl amide functional group for CB.

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在碳纳米管纸表面沉积TiO2以提高其催化性能，用于去除废水污染物

巴克纸（bp）由碳纳米管（CNT）膜组成，具有良好的机械、热学和电学性能。我们报道了通过表面沉积一层薄薄的二氧化钛对碳纳米管纸进行改性，并将其用于光催化去除三种废水污染物：双氯芬酸（DF）、呋喃（CB）和亚甲基蓝（MB）。结果表明，使用0.6 mg光催化剂，在UV-Vis照射90 min后，这些污染物的初始浓度降低（RE）为REDF=99.5%， REMB=96%， RECB=90%。实验还表明，双氯芬酸（k = 0.1028 min−1）的降解速率分别比CB （k = 0.0298 min−1）和MB （k = 0.0174 min−1）快3.5倍和6倍，这可能是由于DF更容易裂解键。然后通过质谱分析这些污染物的UV-Vis照射溶液，以确定光催化过程中形成的物种，并提出MB， DF和CB的可能降解途径。数据表明，DF的降解涉及通过HCl分子的损失形成光环产物，显然比MB打开中心芳香环或CB失去n -甲基酰胺官能团所需的能量要少。下载：下载高清图片（97KB）下载：下载全尺寸图片

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来源期刊

New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.10

自引率

8.80%

发文量

3245

审稿时长

5.5 months

期刊介绍： New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.