Horvath-Kawazoe Model Based Evaluation of Pore Volume of Nanoporous Clinoptilolite |
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| Authors: | K. Ramesh K. Sammi Reddy I. Rashmi A. K. Biswas K. R. Islam |
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| Affiliation: | 1. Division of Soil Chemistry and Fertility, ICAR-Indian Institute of Soil Science, Bhopal, Madhya Pradesh, India;2. Division of Resource Management, ICAR-Central Research Institute for Dryland Agriculture, Hyderabad, India;3. Soil and Bio-Energy, College of Food, Agricultural and Environmental Sciences, Ohio State University, South Centers, Piketon, Ohio, USA |
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| Abstract: | A liquid nitrogen (N2) adsorption isotherm was employed to understand the differential pore-volume distribution (PVD) patterns of commercial Clinoptilolite (zeolite) fractions (<125 µ (Z8; fine or micro), 125–250 µ (Z9; medium) and >250 µ (Z10; coarse). The differential PVD of the fractions were calculated from the original Horvath-Kawazoe (HK) model. A full spectrum of pore volume distribution has exhibited “curves symmetric around the origin” irrespective of the Clinoptilolite fractions. However, the fractions exhibited a definite pattern of curves for each of the micro, meso and macropore region. Although, ultramicropores couldn’t be seen in any of the fractions, super micropore region exhibited uni-modal distribution curve with mono-disperse pores for all the fractions with varying pore volumes, while multimodal and tri-modal for meso and macro pore region respectively. Irrespective of the pore region, fine fraction (Z8) exhibited higher differential pore volume than other fractions. It was evident from the differential PVD that particle size has a major role in determining the textural properties of Clinoptilolite fractions. |
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| Keywords: | Adsorption desorption micro- and macropores texture ultramicropores |
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