Hydroxyl functionalised 2D/2D Ti2CTx MXene @ g-C3N4 photocatalyst confer selectivity for CO2 reduction to ethanol

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Malavika Sunil Sulabha, Arunachaleshwar V, Jaffar Ali B.M
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引用次数: 0

Abstract

Production of solar biofuel where CO2 is reduced to hydrocarbon by harnessing sunlight through photocatalyst has attracted tremendous attention in recent years. In this study, titanium carbide MXene (Ti2CTx), a noble metal-free co-catalyst, was combined with graphitic carbon nitride (g-C3N4) to make a composite wherein 2D Ti2CTx was synthesized following modified MILD process followed by hydrothermal assisted co-polymerization with g-C3N4 resulting in the formation of hydroxyl functionalised Ti2C(OH)2 @ g-C3N4 composite (TiGCN). As Ti2C(OH)2 MXene being an efficient electron-coupled proton donor, the TiGCN exhibited high selectivity for CO2 adsorption and direct reduction to ethanol. Engineering the selective reduction of CO2 capability of TiGCN to ethanol, a C2 compound, was facilitated by OH terminalization imparted via ethanol-assisted sono-chemical processing. Our findings reveal that the loading of OH terminalized Ti2C(OH)2 at 0.8 wt% in g-C3N4 resulted in highest photocatalytic CO2 reduction, yielding 784 µmol gcat−1h−1 of ethanol. We further discuss the possible reaction mechanism of C2 conversion.

Abstract Image

Abstract Image

羟基功能化的2D/2D Ti2CTx MXene @ g-C3N4光催化剂赋予CO2还原为乙醇的选择性
近年来,利用光催化剂将二氧化碳转化为碳氢化合物的太阳能生物燃料引起了人们的极大关注。本研究将无贵金属共催化剂碳化钛MXene (Ti2CTx)与石墨氮化碳(g-C3N4)结合制备复合材料,采用改良的MILD工艺合成二维Ti2CTx,再与g-C3N4进行水热辅助共聚合,形成羟基功能化Ti2C(OH)2 @ g-C3N4复合材料(TiGCN)。由于Ti2C(OH)2 MXene是一种高效的电子偶联质子供体,TiGCN对CO2的吸附和直接还原为乙醇具有很高的选择性。通过乙醇辅助声化学处理,羟基末端化促进了TiGCN选择性还原乙醇(一种C2化合物)的CO2能力。我们的研究结果表明,在g-C3N4中以0.8 wt%的浓度负载OH末端的Ti2C(OH)2,可获得最高的光催化CO2还原量,产生784 µmol gcat−1h−1乙醇。进一步讨论了C2转化可能的反应机理。
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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