Ozelcaglayan Ezgi Demircan, Parker Wayne J
Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, Ontario, Canada.
Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, Ontario, Canada.
Chemosphere. 2023 Apr;320:137964. doi: 10.1016/j.chemosphere.2023.137964. Epub 2023 Jan 31.
The presence of organic micropollutants in water is an ongoing concern due to the potential risks to living organisms. β-Cyclodextrin-based adsorbents have been developed to remove organic micropollutants from water as they are deemed to be efficient, selective and reusable. This literature review establishes the current state of the knowledge on the application of β-Cyclodextrin adsorbents for the removal of organic micropollutants from water and determines knowledge gaps and recommendations for future studies. An inventory of organic micropollutants that have been studied was developed and it revealed that bisphenol-A has been the most commonly studied. Adsorbent configurations were reviewed and modifications to the adsorbent structures that have provided enhanced adsorption properties were identified. The size and shape of the organic micropollutants was found to affect the adsorption behavior. The surface charge of β-Cyclodextrin adsorbents influence adsorption when repulsive forces are present and the extent of repulsion can depend on the pH of the solution. Common competitors such as natural organic matter and inorganic ions do not significantly impact the adsorption of organic micropollutants however relatively small fulvic acids may compete for the β-Cyclodextrin cavity depending on the adsorbent type. Desorption of organic micropollutants from these adsorbents has been accomplished with alcohols and most adsorbents have been recovered and reused in adsorption/desorption cycles. The need for enhanced recovery processes that maintain water quality and adsorbent integrity was identified. The use of quantitative structure-activity relationships and molecular computational tools could potentially guide future environmental applications of β-Cyclodextrin adsorbents.
由于对生物有机体存在潜在风险，水中有机微污染物的存在一直令人担忧。基于β-环糊精的吸附剂已被开发用于从水中去除有机微污染物，因为它们被认为是高效、选择性和可重复使用的。这篇文献综述阐述了关于β-环糊精吸附剂用于从水中去除有机微污染物的应用的当前知识状态，并确定了知识空白以及对未来研究的建议。编制了一份已研究的有机微污染物清单，结果表明双酚A是研究最普遍的。对吸附剂构型进行了综述，并确定了对吸附剂结构的改性，这些改性提供了增强的吸附性能。发现有机微污染物的大小和形状会影响吸附行为。当存在排斥力时，β-环糊精吸附剂的表面电荷会影响吸附，排斥程度可能取决于溶液的pH值。天然有机物和无机离子等常见竞争物对有机微污染物的吸附没有显著影响，然而，相对较小的富里酸可能会根据吸附剂类型竞争β-环糊精腔。已用醇类实现了有机微污染物从这些吸附剂上的解吸，并且大多数吸附剂已在吸附/解吸循环中回收和重复使用。确定了需要改进回收工艺以保持水质和吸附剂完整性。定量构效关系和分子计算工具的使用可能会指导β-环糊精吸附剂未来的环境应用。
