Extraction and green template-free synthesis of high-value mesoporous γ-Al2O3 and SiO2 powders from coal gangue

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-06-22 DOI:10.1016/j.powtec.2024.120023

Mohammad Sepehrian, Fatemeh Yazdi, Mansoor Anbia

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Abstract

The study successfully demonstrated an eco-friendly approach for synthesizing mesoporous alumina and mesoporous silica from coal gangue, in line with green chemistry rules. By employing natural breakdown and increased dissolution of coal gangue through specific chemical treatments, along with optimal leaching conditions, this study achieved a dissolution efficiency of over 98% for aluminum. This process, which includes leaching, separation, simultaneous precipitation, selective dissolution, gel formation, and calcination, produced mesoporous alumina and mesoporous silica without the need for templates. The results presented that the synthesized mesoporous alumina and silica had purities of 98.81% and 99.08%, respectively. Additionally, the synthesized mesoporous alumina and silica had specific surface areas of 340.15 and 392.85 $m^{2}$ /g, and average pore sizes of 7.27 and 3.25 nm, confirming the desirable physical properties of the synthesized γ-Al₂O₃ and SiO₂. These products offer a sustainable solution to environmental issues caused by coal accumulation, with promising applications across various industries.

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从煤矸石中提取并无模板绿色合成高价值介孔 γ-Al2O3 和 SiO2 粉体

该研究成功展示了一种从煤矸石中合成介孔氧化铝和介孔二氧化硅的环保方法，符合绿色化学规则。该研究利用煤矸石的自然分解，通过特定的化学处理提高煤矸石的溶解度，并采用最佳的浸出条件，使铝的溶解效率达到 98% 以上。这一过程包括浸出、分离、同时沉淀、选择性溶解、凝胶形成和煅烧，无需模板即可生产出介孔氧化铝和介孔二氧化硅。结果表明，合成的介孔氧化铝和二氧化硅的纯度分别为 98.81% 和 99.08%。此外，合成的介孔氧化铝和二氧化硅的比表面积分别为 340.15 和 392.85 m2/g，平均孔径分别为 7.27 和 3.25 nm，证实了合成的 γ-Al2O3 和 SiO2 具有理想的物理特性。这些产品为解决煤炭堆积造成的环境问题提供了一种可持续的解决方案，在各行各业都有广阔的应用前景。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.