A novel method of preparing high surface area porous gamma alumina granules from kaolin

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-05-16 DOI:10.1016/j.micromeso.2025.113697

Amit Kumar Yadav , Binod Kumar , Ravi Mohan Prasad , Sunipa Bhattacharyya

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引用次数: 0

Abstract

Tubular-shaped porous gamma alumina (γ-Al₂O₃) granules were synthesized from an unconventional source of kaolin powder using acid extraction followed by a modified oil-drop method. Different organic ingredients, including starch, sucrose, and spent tea leaf waste (STLW) and synthetic constituents like PVP and PEG, were utilized as pore-forming additives to make the granules porous and useful for adsorbent application. The resulting γ-Al₂O₃ granules measured approximately 6 mm long and 2 mm in diameter. The influence of various parameters on the granules' formation, morphology, and stability was systematically investigated. The γ-alumina phase formation was confirmed by powder X-ray diffraction (XRD) study and Fourier-transform infrared spectroscopic analysis (FTIR). Surface morphology and specific surface area of the granules were studied using field emission scanning electron microscopy (FESEM) and N₂ adsorption-desorption analysis. The porous structure of the granules was validated through Barrett-Joyner-Halenda (BJH) pore size distribution analysis and FESEM imaging. The γ-alumina granules with starch as a pore-forming additive demonstrated the highest specific surface area. The unimodal distribution of pores in the mesoporous range is standard for all the batches prepared using different pore former, indicating their potential suitability for adsorption applications.

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一种利用高岭土制备高表面积多孔氧化铝颗粒的新方法

以非常规来源的高岭土粉末为原料，采用酸萃取和改进的油滴法合成了管状多孔γ-氧化铝（γ-Al2O3）颗粒。不同的有机成分，包括淀粉、蔗糖、废茶叶（STLW）和合成成分，如PVP和PEG，作为成孔添加剂，使颗粒多孔，有利于吸附剂的应用。所得的γ-Al2O3颗粒长约6毫米，直径约2毫米。系统地研究了各种参数对颗粒形成、形态和稳定性的影响。通过粉末x射线衍射（XRD）和傅里叶变换红外光谱分析（FTIR）证实了γ-氧化铝相的形成。采用场发射扫描电镜（FESEM）和N2吸附-脱附分析对颗粒的表面形貌和比表面积进行了研究。通过Barrett-Joyner-Halenda （BJH）孔径分布分析和FESEM成像验证了颗粒的孔隙结构。以淀粉为成孔添加剂的γ-氧化铝颗粒比表面积最高。在中孔范围内的单峰型孔隙分布是使用不同孔隙成形剂制备的所有批次的标准，表明它们具有潜在的吸附应用适用性。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.