环糊精酯化交联天然生物质材料强化吸附水中典型HOCs的机理研究

The removal of hydrophobic organic pollutants (HOCs) is one of the research focuses in the field of water pollution control. Cyclodextrins is a class of cyclic oligosaccharides with special structure, having hydrophobic cavities for HOCs inclusion and recognition. Organic carboxylic acids, such as citric acid, were used as crosslinking agents, and various cyclodextrins were grafted with the reactive hydroxyl groups of natural biomass materials through the esterification process, obtaining the green and controllable methods for adsorbent preparation. The objectives of this study are to reveal the effects of cyclodextrin structure, pretreatment conditions, catalyst types, esterification methods and cross-linking process conditions on the chemical composition, morphology and size parameters of modified materials, eventually, to figure out the preparation mechanism of cyclodextrin esterified natural biomass materials. Particularly, the adsorption behavior of typical HOCs on the modified adsorption material, the strengthening adsorption mechanisms and the structure-activity relationship were investigated. This project meets the urgent requirement of effective HOCs removal from the water environment and its implementation is beneficial to achieve the goal of treating pollutants with high efficiency and low consumption technologies.

疏水性有机污染物(HOCs)的去除是水污染控制领域的研究热点之一。环糊精是一类结构特殊的环状低聚糖，所拥有的疏水空腔对HOCs有包络识别功能。项目采用柠檬酸等有机羧酸为交联剂，使不同空腔大小的环糊精与生物质材料的活性羟基进行酯化反应，实现高效吸附材料的"绿色"可控制备；揭示环糊精结构、预处理条件、催化剂种类、酯化途径、交联工艺等对改性材料的化学组成、形貌和尺寸等参数的影响规律，提出环糊精酯化交联天然生物质材料的制备机制；重点研究典型HOCs在接枝材料上的吸附行为，探明接枝材料对水中有机污染物的强化吸附机制与构效关系。本项目基于对水环境HOCs有效控制的迫切需求，其实施有助于实现污染物高效低耗处理的目标。

疏水性有机污染物(HOCs)的去除是水污染控制领域的研究热点之一。作为一类结构特殊的环状低聚糖，环糊精所拥有的疏水空腔对HOCs有包络识别功能。本课题以柠檬酸等有机羧酸为交联剂，筛选具有“吸附富集+光催化”功能的环糊精及衍生物与天然生物质材料进行酯化反应，人工调控制备具选择性吸附功能的新型水处理材料；揭示环糊精结构、预处理条件、催化剂种类及酯化途径、交联工艺条件等对改性材料的化学组成、形貌和尺寸等参数的影响规律，提出了环糊精酯化交联天然生物质材料的制备机制；重点研究了水中典型HOCs及重金属离子等共存污染物在环糊精接枝材料上的吸附、光降解与原位再生行为，初步探明该新型材料对水中有机污染物的强化吸附、催化降解的机制，并揭示了环糊精基团在其中的作用途径。