Temperature annealing and aluminum atomic concentration effect on structural, morphological and optical properties of ZnO-Al2O3 nanocomposites powders and photocatalytic performances

IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-09-12 DOI:10.1007/s10971-024-06514-6
Ferial Benmammar, Aicha Ayadi, Lyes Maifi, Abdelhamid Chari, Kamel Agroui
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Abstract

Pure ZnO nanoparticles and ZnO-Al2O3 nanocomposites prepared with Al2O3 content of 10, 20 and 30 atomic ratios were synthetized via Sol–gel method and then calcined for 2 h at different temperature 450, 700 and 900 °C. The structural, morphological and optical properties of the powder as-synthetized are investigated. Photocatalytic activity was assessed using methylene blue degradation. In the present work, the high purity of the nanoparticles was confirmed by EDS spectra. The XRD results show that ZnO powder has a wurtzite structure. The aluminum in composite powders leads to the appearance of the ZnAl2O4 spinel phase and it shows that this phase is appeared in the ZnO-30% at Al (Z30A) nanocomposite from an annealing temperature 450 °C as well as increasing the annealing temperature reduces the crystallite size. The flower-like morphology was well defined in these nanocomposites with an average size in the nanometer range. Photoluminescence reveals the incorporation of aluminum into the as-synthetized nanocomposites compared with XRD results.The optical absorption spectra have been presented the relationship between the band gap, particle size, annealing temperature, Al concentration and Urbach energy. Our result suggests that the annealing temperature 700 °C can be considered as an order-disorder transition temperature. The photo-catalytic application of pure ZnO and their composites nanoparticles shows that the best photocatalytic activity is obtained for the Z30A nanocomposite in the presence of MB dye, under UV light. This sample has the smallest crystal size and a high content of the ZnAl2O4 phase. A small particle size ensures high photoactivity.

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温度退火和铝原子浓度对 ZnO-Al2O3 纳米复合粉末的结构、形貌和光学特性以及光催化性能的影响
通过溶胶-凝胶法合成了纯氧化锌纳米颗粒和氧化锌-Al2O3 纳米复合材料(Al2O3 的原子比分别为 10、20 和 30),然后在 450、700 和 900 °C 的不同温度下煅烧 2 小时。研究了合成粉末的结构、形态和光学特性。采用亚甲基蓝降解法评估了光催化活性。本研究通过 EDS 光谱证实了纳米颗粒的高纯度。XRD 结果表明,氧化锌粉末具有钨酸盐结构。复合粉末中的铝导致 ZnAl2O4 尖晶石相的出现,这表明在退火温度为 450 ℃ 的 ZnO-30% Al (Z30A) 纳米复合材料中出现了这一相,同时退火温度的升高也减小了晶粒尺寸。这些纳米复合材料的花状形貌非常清晰,平均尺寸在纳米范围内。与 XRD 结果相比,光致发光揭示了铝与合成纳米复合材料的结合。我们的研究结果表明,退火温度 700 °C 可被视为有序-无序转变温度。纯 ZnO 及其复合纳米粒子的光催化应用表明,在 MB 染料存在的情况下,Z30A 纳米复合材料在紫外光下的光催化活性最好。该样品的晶体尺寸最小,ZnAl2O4 相含量高。小粒径确保了高光活性。
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来源期刊
Journal of Sol-Gel Science and Technology
Journal of Sol-Gel Science and Technology 工程技术-材料科学:硅酸盐
CiteScore
4.70
自引率
4.00%
发文量
280
审稿时长
2.1 months
期刊介绍: The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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