A Novel Mesoporous SiO2 Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO2 Capture,Energy & Fuels

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A Novel Mesoporous SiO2 Material with MCM-41 Structure from Coal Gangue: Preparation, Ethylenediamine Modification, and Adsorption Properties for CO2 Capture
Energy & Fuels ( IF 5.2 ) Pub Date : 2018-03-19 00:00:00 , DOI: 10.1021/acs.energyfuels.8b00318
Hong Du _{1,

2} , Liang Ma _{1,

2} , Xiaoyao Liu _{1,

2} , Fei Zhang _{1,

2} , Xinyu Yang _{1,

2} , Yu Wu _{1,

2} , Jianbin Zhang _{1,

2}

Affiliation

A novel mesoporous SiO₂ material (M-SiO₂) with MCM-41 structure was readily fabricated from the inexpensive coal gangue via a hydrothermal reaction in the presence of cetyltrimethylammonium bromide (CTAB) for CO₂ capture. On the basis of orthogonal experimental results, the optimum conditions for the preparation of M-SiO₂ were identified as follows: the SiO₃^2– leaching of 21 g/L from coal gangue, the CTAB concentration of 0.25 mol/L, the HCl concentration of 2.5 mol/L, the hydrothermal temperature of 393.15 K, and the hydrothermal time of 20 h. Under the optimum condition, the M-SiO₂ exhibited an adsorption capability of 9.61 mg/g to 8% CO₂ at 298.15 K. To further improve the CO₂ adsorption performance, the M-SiO₂ was chemically modified using ethylenediamine (EDA), and the optimum conditions for the modification of M-SiO₂ were identified as follows: the impregnation time of 10 h, the drying temperature of 343.15 K, and the ratio of EDA/M-SiO₂ = 2:1. Under the optimum conditions, the adsorption capability of EDA-modified M-SiO₂ (EDA-M-SiO₂) was increased by 83.5 mg/g. The obtained M-SiO₂ and EDA-M-SiO₂ were systemically characterized by N₂ adsorption–desorption isotherms, thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction measurements techniques. The analytical results indicated that the M-SiO₂ was mainly composed of O and Si in the form of SiO₂ with a specific surface area of 156 m²/g, and part of M-SiO₂ exhibited a structure similar to MCM-41. Moreover, the mechanisms of EDA modification and CO₂ adsorption were investigated and discussed in detail.

中文翻译：

煤Gang石中具有MCM-41结构的新型介孔SiO ₂材料：制备，乙二胺改性及对CO ₂捕集的吸附性能

一种新的中孔的SiO ₂材料（M-的SiO ₂）用MCM-41结构容易地从便宜的煤矸石通过在十六烷基三甲基溴（CTAB）为CO的存在下进行水热反应制造₂捕获。根据正交实验结果，确定了制备M-SiO ₂的最佳条件：SiO ₃^2-从煤石中浸出21 g / L，CTAB浓度为0.25 mol / L，HCl浓度为2.5 mol / L，水热温度为393.15 K，水热时间为20 h。在最佳条件下，M-SiO ₂表现出9.61 mg / g对8％CO ₂的吸附能力在298.15 K.为了进一步提高CO ₂的吸附性能，对M-的SiO ₂，使用乙二胺（EDA）化学修饰的，和用于M-的SiO的变形例的最佳条件₂被确定为如下：在10小时的浸渍时间，干燥温度为343.15 K，EDA / M-SiO ₂之比= 2：1。在最佳条件下，EDA改性的M-SiO ₂（EDA-M-SiO ₂）的吸附能力提高了83.5 mg / g。通过N ₂对得到的M-SiO ₂和EDA-M-SiO ₂进行了系统表征。吸附-解吸等温线，热重分析，傅立叶变换红外光谱，扫描电子显微镜，透射电子显微镜和X射线衍射测量技术。分析结果表明，M-SiO ₂主要由SiO ₂形式的O和Si组成，比表面积为156 m ² / g，部分M-SiO ₂具有与MCM-41相似的结构。。此外，对EDA修饰和CO ₂吸附的机理进行了详细的研究和探讨。

更新日期：2018-03-19

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