Preparation of surface-functionalized porous clay heterostructures via carbonization of soft-template and their adsorption performance for toluene
Preparation of surface-functionalized porous clay heterostructures via carbonization of soft-template and their adsorption performance for toluene
复制标题
软模板碳化制备表面功能化多孔粘土异质结构及其对甲苯的吸附性能
DOI：
10.1016/j.apsusc.2015.11.261
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发表时间：
2016-02-15
影响因子：
6.7
通讯作者：
He, Hongping
中科院分区：
文献类型：
--
作者：
Wang, Yuebo;Su, Xiaoli;He, Hongping
通过模板剂与硫酸的碳化合成了一种新型表面功能化多孔粘土异质结构（SF-PCH）。转化后的碳沉积在 SF-PCH 样品的多孔表面上，并改变了其表面化学性质。该复合材料的最大碳含量为5.35%，比表面积高达428 m(2)/g，微孔体积约为0.2 cm(3)/g。当使用温和浓度的硫酸溶液时，SF-PCH在碳化和煅烧后保留了层状和多孔结构。 XPS 分析证实，孔道中的碳质物质被各种有机基团功能化，包括碳基、含氮基团和硫酸基团。吸附剂的表面化学性质和结构特征均影响SF-PCH对甲苯的吸附性能。与未处理的PCH相比，SF-PCH样品在低压区域表现出对甲苯更强的吸附亲和力，在实际应用中更有价值。这些结果表明，软模板碳化是 PCH 表面改性的可行过程，使所得复合材料成为甲苯排放控制应用的有希望的候选者。 (C) 2015 Elsevier B.V. 保留所有权利。
A new type of surface-functionalized porous clay heterostructures (SF-PCH) was synthesized via carbonization of the template agents with sulfuric acid. The converted carbons deposited on the porous surface of the SF-PCH samples and changed their surface chemical properties. The composites possessed a maximum carbon content of 5.35%, a large specific surface area of 428 m(2)/g and micropore volume of approximately 0.2 cm(3)/g. The layered and porous structure of SF-PCH was retained after carbonization and calcination when sulfuric acid solution with a mild concentration was used. Analysis by XPS confirmed that the carbonaceous matter in the pore channels was functionalized with various organic groups, including carbonaceous, nitrogenous, and sulfated groups. Both the surface chemical property and structural characteristic of adsorbents have effects on the adsorption properties of SF-PCH for toluene. The SF-PCH samples exhibited a stronger adsorption affinity to toluene compared with untreated PCH in the low pressure region, which is more valuable in the practical applications. These results demonstrate that carbonization of soft-template is a feasible process for the surface modification of PCH, enabling the resulting composites to become promising candidates for application in toluene emission control. (C) 2015 Elsevier B.V. All rights reserved.