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Microwave Irradiation-Assisted Synthesis of Zeolites from Coal Fly Ash: An Optimization Study for a Sustainable and Efficient Production Process
ACS Omega ( IF 3.7 ) Pub Date : 2020-09-22 , DOI: 10.1021/acsomega.0c00931 Boitumelo Makgabutlane 1, 2 , Lebea N Nthunya 3 , Edward N Nxumalo 1 , Nicholas M Musyoka 4 , Sabelo D Mhlanga 2
ACS Omega ( IF 3.7 ) Pub Date : 2020-09-22 , DOI: 10.1021/acsomega.0c00931 Boitumelo Makgabutlane 1, 2 , Lebea N Nthunya 3 , Edward N Nxumalo 1 , Nicholas M Musyoka 4 , Sabelo D Mhlanga 2
Affiliation
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Class F South African coal fly ash was used as a precursor for the synthesis of zeolite A via complete microwave irradiation. To attain optimal conditions for the synthesis of zeolite A with minimum impurities, the microwave synthesis time, irradiation power, and Si/Al ratio were varied. Sodalite with fly ash phases were obtained when the Si/Al ratio in the coal fly ash was not adjusted and when the microwave irradiated coal fly ash slurry was used instead of the extract solution. Increased microwave irradiation time power and time favored the crystallization of zeolite A phase due to sufficient energy needed to ensure the dissolution of Al and Si from coal fly ash. A Brunauer–Emmett–Teller surface area of 29.54 m2/g and a cation exchange capacity of 3.10 mequiv/g were achieved for zeolite A, suggesting its potential application as an adsorbent and cation exchange material for environmental remediation. Complete microwave irradiation offers a greener approach toward zeolite synthesis from coal fly ash compared to conventional hydrothermal and fusion methods that consume a lot of energy and require longer reaction times.
中文翻译：
微波辐射辅助粉煤灰合成沸石：可持续高效生产工艺的优化研究
F 级南非煤飞灰被用作通过完全微波辐射合成 A 型沸石的前体。为了获得杂质最少的 A 型沸石合成的最佳条件，改变了微波合成时间、辐射功率和 Si/Al 比。当不调整粉煤灰中的Si/Al比并且使用微波辐射的粉煤灰浆料代替提取溶液时，获得了具有粉煤灰相的方钠石。增加微波辐射时间、功率和时间有利于沸石A相的结晶，因为需要足够的能量来确保Al和Si从煤飞灰中溶解。沸石A的Brunauer-Emmett-Teller表面积为29.54 m 2 /g，阳离子交换容量为3.10 mequiv/g，表明其作为环境修复吸附剂和阳离子交换材料的潜在应用。与消耗大量能量且需要更长反应时间的传统水热和熔融方法相比，完全微波辐射为从粉煤灰合成沸石提供了一种更绿色的方法。
更新日期：2020-10-06
中文翻译：
微波辐射辅助粉煤灰合成沸石：可持续高效生产工艺的优化研究
F 级南非煤飞灰被用作通过完全微波辐射合成 A 型沸石的前体。为了获得杂质最少的 A 型沸石合成的最佳条件，改变了微波合成时间、辐射功率和 Si/Al 比。当不调整粉煤灰中的Si/Al比并且使用微波辐射的粉煤灰浆料代替提取溶液时，获得了具有粉煤灰相的方钠石。增加微波辐射时间、功率和时间有利于沸石A相的结晶，因为需要足够的能量来确保Al和Si从煤飞灰中溶解。沸石A的Brunauer-Emmett-Teller表面积为29.54 m 2 /g，阳离子交换容量为3.10 mequiv/g，表明其作为环境修复吸附剂和阳离子交换材料的潜在应用。与消耗大量能量且需要更长反应时间的传统水热和熔融方法相比，完全微波辐射为从粉煤灰合成沸石提供了一种更绿色的方法。
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