Influence and its mechanism of temperature variation in a muffle furnace during calcination on the adsorption performance of rod-like MgO to Congo red
Influence and its mechanism of temperature variation in a muffle furnace during calcination on the adsorption performance of rod-like MgO to Congo red作者机构：School of Material Science and Engineering Shaanxi University of Science and Technology Xi'an 710021 China School of Chemistry and Chemical Engineering Xi'an Shiyou University Xi'an 710065 China School of Earth Sciences and Engineering Xi'an Shiyou University Xi'an 710065 China
出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)
年 卷 期：2018年第12卷第3期
页 面：304-321页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 070601[理学-气象学] 08[工学] 0817[工学-化学工程与技术] 0706[理学-大气科学] 0703[理学-化学]
基 金：The authors would like to acknowledge funding support from the National Natural Science Foundation of China (Grant Nos. 21575112 21777128 and 21705125) and Shaanxi S&T Research Development Project of China (Grant No. 2016GY-231)
主 题：magnesium oxide calcination muffle furnace placed location adsorption performance
摘 要：Calcination temperature plays a crucial role in determining the surface properties of generated MgO, but the influence of temperature variation in a muffle furnace during calcination on its performance is rarely reported. Herein we observed that the temperature in a muffle furnace during calcination demonstrated a gradually increasing trend as the location changed from the furnace doorway to the most inner position. The variation in temperature had a great impact on the adsorption performance of generated rod-like MgO without and/or with involvement of Na2SiO3 to Congo red in aqueous solution. To get a better understanding on the detailed reasons, various techniques including actual temperature measurement via multimeter, N2 physical adsorption, CO2 chemical adsorption and FT-IR spectrometry have been employed to probe the correlation between the adsorption performance of generated MgO from various locations and the inner actual temperature of used muffle furnace as well as their physicochemical properties. In addition, two mechanisms were proposed to elucidate the adsorption process of Congo red over the surface of generated MgO without and/or with presence of Na2SiO3, respectively.
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