文献类型：期刊文献

英文题名：Graded Synthesis of Hierarchical Activated Carbon and Mesoporous Silica Microspheres from High Carbon Coal Gasification Fine Slag for Ultra-High Capacity Adsorption of Methyl Blue

作者：Liu, Bin[1]; Chai, Zhen[1]; Lv, Peng[1]; Bai, Yonghui[1]; Wang, Jiaofei[1]; Guo, Qinghua[2]; Su, Weiguang[1]; Yu, Guangsuo[1,2]

机构：[1] School of Chemistry and Chemical Engineering, State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, China; [2] Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220302703)

语种：英文

外文关键词：Activated carbon - Adsorption - Carbonization - Coal - Coal deposits - Mesoporous materials - Microspheres - Slags - Waste disposal

摘要：The resource utilization and harmless disposal of coal gasification fine slag (CGFS) are of great significance for the constructing a zero-emission industrial system and resource circular economy. In this study, residual carbon (RC) and slag particles (SP) in CGFS were separated by froth flotation, hierarchical activated carbon (AC) and mesoporous silica microspheres (MSM) were prepared by alkali activation and acid leaching, respectively. Moreover, amino functionalization mesoporous silica microspheres (A-MSM) and activated carbon (T-AC) were prepared by grafting 3-aminopropyltriethoxysilane (ATPES) and tetraethylenepentamine (TEPA), respectively. They were used to remove methyl blue (MB) from wastewater. The results show that the high-efficiency separation of RC and SP in CGFS can be achieved by optimizing the flotation process parameters. The surface amino modification of the two porous materials can significantly improve the adsorption performance of MB. The maximum adsorption capacity of T-AC4-900 for MB was 1708.01 mg·g ?1 , which was increased by 42.8% compared with AC4-900. The maximum adsorption capacity of A-MSM15 for MB was 1249.46 mg·g ?1 , which was 64.6 times that of MSM15. The pseudo-second-order kinetic model could well describe the adsorption behavior, indicating that MB is mainly chemisorption on porous materials. Furthermore, the adsorption state of MB on the material surface was analyzed by FT-IR and XPS, and the possible adsorption mechanism was speculated. The result of this study provides a new idea for the resource conversion of CGFS to high-performance adsorbents. ? 2022, The Authors. All rights reserved.