Yang Ke, Yan Yu, Chen Wen, Kang Hongtao, Han Yi, Zhang Wenquan, Fan Yafeng, Li Zhenxing
State Key Laboratory of Heavy Oil Processing, Institute of New Energy, China University of Petroleum-Beijing Beijing 102249 P. R. China
RSC Adv. 2018 Jun 29;8(42):23671-23678. doi: 10.1039/c8ra03834a. eCollection 2018 Jun 27.
Nowadays, sulfur compounds in fuel oils are the main source of environmental pollution and ultra-deep desulfurization of fuel oils has become a top priority. Many porous materials such as activated carbon and metal-organic frameworks (MOFs) have attracted attention in the field of adsorption desulfurization in recent years. A series of novel MOF/hydroxylated graphene hybrid materials were successfully designed and synthesized with different ratios for application in the field of ADS. The hydroxylated graphene (HG) was found dispersed not just on the surface but also inserted in the MOF crystals in what we call a nut-like structure. It was found that the introduction of a small amount (<8%) of HG does not hinder the formation of the Cu-BTC structure. Meanwhile, the adsorption performances of these composites for thiophene from oils were evaluated using batch adsorption tests at room temperature. The synergistic effect between Cu-BTC and HG in the hybrid materials can improve the adsorption capacity for thiophene molecules. The experimental equilibrium curve fitted well with the theoretical Langmuir isotherm model. The maximum sulfur adsorption capacity of 35.6 mg S g for the hybrid materials was calculated using the Langmuir adsorption equation, which increased by 48% compared to parent Cu-BTC. Thus, these hybrid materials have great potential for application in the adsorptive desulfurization process, especially for thiophenic compounds.
如今，燃料油中的硫化合物是环境污染的主要来源，燃料油的超深度脱硫已成为当务之急。近年来，许多多孔材料如活性炭和金属有机框架（MOF）在吸附脱硫领域受到关注。一系列不同比例的新型MOF/羟基化石墨烯杂化材料被成功设计并合成，用于吸附脱硫领域。发现羟基化石墨烯（HG）不仅分散在表面，还以我们所称的坚果状结构插入MOF晶体中。发现引入少量（<8%）的HG并不妨碍Cu-BTC结构的形成。同时，在室温下使用间歇吸附试验评估了这些复合材料对油中噻吩的吸附性能。杂化材料中Cu-BTC和HG之间的协同效应可以提高对噻吩分子的吸附能力。实验平衡曲线与理论朗缪尔等温线模型拟合良好。使用朗缪尔吸附方程计算出杂化材料的最大硫吸附容量为35.6 mg S/g，与母体Cu-BTC相比增加了48%。因此，这些杂化材料在吸附脱硫过程中具有很大的应用潜力，特别是对于噻吩类化合物。
