负载碳多孔有机插层LDHs的组装及对氯酚的增强吸附机理与选择性

项目名称： 负载碳多孔有机插层LDHs的组装及对氯酚的增强吸附机理与选择性

项目编号： No.21277108

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 环境科学、安全科学

项目作者： 周家斌

作者单位： 武汉理工大学

项目金额： 80万元

中文摘要： 水滑石类插层材料（LDHs）具有独特的层状结构与组成，拥有良好的水溶性阴离子交换能力，而直接吸附疏水性有机物的容量有限。本研究选取氯酚化合物作为模型污染物，以高效吸附去除水中内分泌干扰物为研究目标，拟分别从LDHs的层间疏水性、表面化学活性和孔结构三个方面调控材料的物化特性：采用有机物插层化学技术，增强LDHs材料层间疏水性；负载纳米碳质成分（活性炭纤维、纳米碳球和石墨烯等），改善层板表面吸附活性；构筑分等级纳米多孔体系，调控孔结构、比表面积和吸附位。研究LDHs材料对水中氯酚的吸附热动力学规律，分析其增强吸附机理、构效关系和主控因素，优化吸附去除的最佳条件。通过计算和分子模拟，并结合时间分辨技术和原位表征技术，揭示层间客体分子的排列方式和主客体作用力。探讨不同种类LDHs对氯酚异构体的插层选择性与机理，并考察其再生循环性，这将为LDHs材料应用于水污染治理提供科学依据。

中文关键词： 水滑石；分等级多孔；吸附机理；选择性吸附；氯酚化合物

英文摘要： Layered double hydroxides (LDHs) have good anions exchange capacities due to their unique structure and composition. However they have limited adsorption affinity towards hydrophobic organic compounds in water. The objective of the present study is to investigate the removal of endocrine disrupting chemicals (chlorophenols as target pollutant) in water by adsorption technology. The physicochemical properties of LDHs are improved by the following route, increasing hydrophobic using organic intercalative chemistry technologies, improving surface reactivity by doped carbon (reactive carbon fiber, carbon nanosphere, graphene), increasing surface areas and active adsorption sites by assembly of hierarchical porous structure. The adsorption kinetics and thermodynamic behaviors of chlorophenols onto LDHs are studied by batch model test. The enhanced adsorption mechanism, relationship between structure and performance, major factors affecting adsorption process are analyzed. The removal experimental parameters for chlorophenols in water are optimized. The arrangement of guest anions and host-guest interactions in the layers are investigated based on molecular simulation together with time serials and in situ characterization technology. Intercalative selectivity and mechanism for chlorophenols in mixed solutions using v

英文关键词： layered double hydroxides；hierarchical porous；adsorption mechanism；selective adsorption；chlorophenols