High efficiency removal of organic pollutant via the synergistic effect between adsorption and photocatalysis of rGO/TiO2/g-C3N4 composite aerogel

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.326

Yucao Yuan , Yongqiang Niu , Hongliang Xu , Cheng Fang , Wen Liu , Bo Song , Mingliang Li , Gang Shao , Hongxia Lu , Hailong Wang , Rui Zhang

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Abstract

Three-dimensional (3D) rGO/TiO₂/g-C₃N₄ composite aerogels (CTG-V, V = 1, 2, 3, 4) were synthesized via the hydrothermal method by using TiO₂/g-C₃N₄ (CTO) and graphene oxide (GO) with a mass ratio of 1:1, 2:1, 3:1, and 4:1, respectively. The phase composition, microstructure, photo-electrical performance, the removal performance toward Rhodamine B (RhB), etc. of CTG-V were systematically investigated. The results showed that CTG-V exhibited a stable 3D structure, much higher light absorption ability, improved separation and migration efficiency of the photogenerated carriers in comparison to CTO. With the mass ratio of CTO to GO increasing, the adsorption reaction rate constants (k_a) of CTG-V decreased but their photocatalytic degradation reaction rate constants (k_p) increased gradually, and the adsorption-photocatalysis synergistic reaction rate constants (k_s) of CTG-V which increased firstly and then decreased, were higher than their single k_a values or k_p values. After 60 min of adsorption-photocatalysis synergistic degradation reaction, the removal rate of RhB (200 mL, 10 mg/L) reached 92.19 % by CTG-2 (0.1 g), which exhibited the optimum removal performance. The k_s value of CTG-2 (0.0273 min⁻¹) calculated by pseudo-first-order linear fitting was 11.38, 2.87 and 1.94 times that of bulk g-C₃N₄, g-C₃N₄ nanosheets and TiO₂/g-C₃N₄ composites, respectively. CTG-2 was easy to be separated and recycled from solution during the cycling experiments, and it presented excellent stability as it still removed 85.15 % of RhB molecules after five cycles of adsorption-photocatalysis synergistic reaction.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.