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Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine
RSC Advances ( IF 3.9 ) Pub Date : 2020-1-14 , DOI: 10.1039/c9ra10114d Boitumelo Makgabutlane 1, 2 , Lebea N Nthunya 3 , Nicholas Musyoka 4 , Bongumusa S Dladla 5 , Edward N Nxumalo 1 , Sabelo D Mhlanga 1, 2
RSC Advances ( IF 3.9 ) Pub Date : 2020-1-14 , DOI: 10.1039/c9ra10114d Boitumelo Makgabutlane 1, 2 , Lebea N Nthunya 3 , Nicholas Musyoka 4 , Bongumusa S Dladla 5 , Edward N Nxumalo 1 , Sabelo D Mhlanga 1, 2
Affiliation
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Zeolites synthesized from biomass waste materials offer a great opportunity in the sustainable utilization of the waste. In this work, energy-efficient processes (i.e. microwave and ultrasound irradiation) were used to synthesize pure phase sodalite (zeolite) from coal fly ash obtained from a power plant in South Africa. The pure-phase sodalite was obtained with a comparatively higher surface area (16 m2 g−1) and cation exchange capacity (2.92 meq. g−1) with 40 min total reaction time. The removal of ammonium from urine was carried out using (i) the coal fly ash-derived sodalite, (ii) raw coal fly ash and (iii) a commercially available natural zeolite (clinoptilolite). The pure phase sodalite exhibited the highest removal efficiency of about 82% and 73% in synthetic and real hydrolyzed urine respectively. The adsorption process followed the pseudo second-order kinetic model and the Freundlich adsorption isotherm, indicating that the adsorption process occurred on a heterogeneous surface.
中文翻译：
微波辅助合成粉煤灰基沸石去除尿液中的铵
由生物质废料合成的沸石为废物的可持续利用提供了巨大的机会。在这项工作中，采用节能工艺（即微波和超声波辐照）从南非一家发电厂的粉煤灰中合成纯相方钠石（沸石）。获得的纯相方钠石具有相对较高的表面积 (16 m 2 g -1 ) 和阳离子交换容量 (2.92 meq. g -1)，总反应时间为 40 分钟。使用 (i) 粉煤灰衍生的方钠石、(ii) 原粉煤灰和 (iii) 市售天然沸石（斜发沸石）从尿液中去除铵。纯相方钠石在合成尿和真正水解尿中的去除效率最高，分别约为 82% 和 73%。吸附过程遵循准二级动力学模型和Freundlich吸附等温线，表明吸附过程发生在非均相表面上。
更新日期：2020-01-14
中文翻译：
微波辅助合成粉煤灰基沸石去除尿液中的铵
由生物质废料合成的沸石为废物的可持续利用提供了巨大的机会。在这项工作中，采用节能工艺（即微波和超声波辐照）从南非一家发电厂的粉煤灰中合成纯相方钠石（沸石）。获得的纯相方钠石具有相对较高的表面积 (16 m 2 g -1 ) 和阳离子交换容量 (2.92 meq. g -1)，总反应时间为 40 分钟。使用 (i) 粉煤灰衍生的方钠石、(ii) 原粉煤灰和 (iii) 市售天然沸石（斜发沸石）从尿液中去除铵。纯相方钠石在合成尿和真正水解尿中的去除效率最高，分别约为 82% 和 73%。吸附过程遵循准二级动力学模型和Freundlich吸附等温线，表明吸附过程发生在非均相表面上。
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