Enhanced photocatalytic and photoelectrochemical investigation of Ce and Eu modified titanium nanotube arrays towards dye removal

IF 2.1 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Ozone: Science & Engineering Pub Date : 2023-01-01 DOI:10.1080/01919512.2022.2163224

Lobna Mansouri, Dalanda Hamdi, L. Bousselmi

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Abstract

ABSTRACT Cerium and europium-doped titanium nanotube (Ce and Eu-TNTs) were obtained by one-step electrochemical anodization. SEM micrographs show highly ordered nanotubes for pure- TNTs but less organized and more spaced nanotubes for Ce and Eu-TNTs. The XRD results show that anatase is the dominant phase, and the doping does not change the crystalline phase. EIS plots indicated that Ce/Eu doped TNTs photocatalysts possesses a lower electron transfer resistance than pure TNTs, which is related to an effective separation of photogenerated electron/hole pairs. The photodegradation results showed that Ce-TNTs (0.5 mM) and Eu-TNTs (2 mM) photocatalysts exhibit the best enhancement of AB removal reaching a reaction rate of (kapp = 0.026 min−1, t1/2 = 19 min) and (kapp = 0.020 min−1, t1/2 = 20 min), respectively, under initial pH = 3 and CAB = 10 mg.L−1, compared to (kapp = 0.014 min−1, t1/2 = 35 min) for pure TNTs. The adsorption efficiency carried out in the dark after 30 min is enhanced by Ce and Eu-doping and reaches its maximum to 52.08% for Eu-TNTs (2 mM) compared to only (31.11% and 32.96%), respectively, for Ce-TNTs (0.5 mM) and pure TNTs catalyst. Graphical Abstract

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Ce和Eu修饰钛纳米管阵列对染料去除的光催化和光电化学研究

采用一步电化学阳极氧化法制备了铈和铕掺杂钛纳米管(Ce和Eu-TNTs)。扫描电镜显微照片显示，纯碳纳米管有序度高，而铈和铕纳米管有序度低，间距大。XRD结果表明，锐钛矿为主导相，掺杂对晶相没有影响。EIS图表明，Ce/Eu掺杂的tnt光催化剂具有比纯tnt更低的电子转移阻力，这与光生电子/空穴对的有效分离有关。结果表明，在初始pH = 3、CAB = 10 mg条件下，Ce-TNTs (0.5 mM)和Eu-TNTs (2 mM)光催化剂对AB的脱除效果最好，反应速率分别为(kapp = 0.026 min−1,t1/2 = 19 min)和(kapp = 0.020 min−1,t1/2 = 20 min)。L−1，与纯tnt相比(kapp = 0.014 min−1,t1/2 = 35 min)。Ce和eu的掺杂提高了30 min后在黑暗中进行的吸附效率，Eu-TNTs (2 mM)的吸附效率达到52.08%，而Ce-TNTs (0.5 mM)和纯TNTs催化剂的吸附效率分别为31.11%和32.96%。图形抽象

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来源期刊

Ozone: Science & Engineering 环境科学-工程：环境

CiteScore

5.90

自引率

11.10%

发文量

审稿时长

2 months

期刊介绍： The only journal in the world that focuses on the technologies of ozone and related oxidation technologies, Ozone: Science and Engineering brings you quality original research, review papers, research notes, and case histories in each issue. Get the most up-to date results of basic, applied, and engineered research including: -Ozone generation and contacting- Treatment of drinking water- Analysis of ozone in gases and liquids- Treatment of wastewater and hazardous waste- Advanced oxidation processes- Treatment of emerging contaminants- Agri-Food applications- Process control of ozone systems- New applications for ozone (e.g. laundry applications, semiconductor applications)- Chemical synthesis. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees.