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RISS 인기검색어
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- 저자 : Amasha, S. (검색결과 3 건)
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Microwave-assisted synthesis of novel porous organic polymers for effective selective capture of CO2
Ahmed M. Alloush,Hamza Abdulghani,Hassan A. Amasha,Tawfik A. Saleh,Othman Charles S. Al Hamouz 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Performing carbon dioxide (CO2) capture in an environmentally benign and cost-effective way is challengingowing to several factors including selectivity. Thus, the development of polymers that providehigh capacity and selectivity for the removal of CO2 gas is important. N-based porous polymers arepromising for CO2 capture due to their abundant porosity, variable surface characteristics, and great stability. Herein, porous organic polymers were synthesized by microwave-assisted Freidel-Crafts alkylationof 2,20-bipyridine and pyrrole with dimethoxymethane as a cross-linker. The synthesized polymers werecharacterized by Fourier transform infrared, nuclear magnetic resonance, thermogravimetric analyzers,and surface analyzers based on Brunauer–Emmett–Teller theory (BET). The porous polymers exhibitedhigh surface areas of 580 – 930 m2/g. The polymers showed high ideal adsorbed solution theory (IAST)selectivity of 53 – 63 toward CO2 over N2 at 1 bar and 298 K under flue gas composition. Whereas theselectivity toward CO2 over CH4 at 1 bar and 298 K under natural gas composition was 12 – 18. The synthesizedpolymers achieved exceptional H2O adsorption capacity at P/P0 = 0.9 and 293 K of 35 – 45 mmol/g. The results reveal the polymers provide promising candidates for the CO2 capture from various mixtures,such as flue gas and natural gas.
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Palansooriya Kumuduni Niroshika,Withana Piumi Amasha,Jeong Yoonah,Sang Mee Kyung,Cho Yoora,Hwang Geonwook,Chang Scott X.,Ok Yong Sik 한국응용생명화학회 2024 Applied Biological Chemistry (Appl Biol Chem) Vol.67 No.-
The incorporation of organic amendments, such as food waste (FW) and biochar, into soil is an established agronomic practice known for enhancing soil fertility and improving overall soil health. However, the individual and combined effects of FW and biochar on soil properties in microplastic (MP)-contaminated soil–plant systems remain poorly understood. To address this knowledge gap, we conducted a field experiment to investigate the individual and combined effects of polystyrene MPs, FW, and FW-derived biochar on soil properties and lettuce growth. Soil chemical properties were unaffected by the addition of MPs. However, the application of FW and biochar increased the soil pH, with the highest pH (8.2) observed in the combined treatment of biochar and MPs. Despite the presence of MPs, FW application resulted in notable increases in soil electrical conductivity (EC; 2.04 dS m− 1), available nitrogen ( NO3 −–N: 325.5 mg kg− 1, NH4 +–N: 105.2 mg kg− 1), available phosphorus (88.4 mg kg− 1), and total exchangeable cations (18.6 cmol(+) kg− 1). However, these values decreased after lettuce cultivation. In soil cultivated with lettuce, the coexistence of MPs and biochar reduced soil Fluorescein diacetate hydrolase enzyme activity by 46.2% and urease activity by 94.0%. FW addition doubled acid phosphatase activity, whereas FW and its coexistence with MPs decreased alpha diversity. The relative abundance of Actinobacteria decreased with MP application, whereas that of Acidobacteria and Actinobacteria decreased with FW treatment. Gemmatimonadetes and Nitrospirae decreased in soil treated with FW and biochar. The highest relative abundances of Firmicutes and Proteobacteria were observed in the FWadded soils, and Planctomycetes were the highest in the biochar-added soils. FW application negatively affected lettuce growth. Overall, the coexistence of MPs with FW or biochar had limited effects on soil properties and lettuce growth, with FW and biochar serving as the primary factors in modifying soil–plant systems. Future studies should investigate the effects of different MPs and their interactions with organic soil amendments on soil properties and crop growth under different management practices.
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