磁性层状硫属复合吸附剂的构筑及去除水中典型PPCPs的机制研究

For the PPCPs pollution from effluent of municipal sewage treatment plants and the problem of their health risks on the human body, it needs to develop a new technology to remove typical PPCPs. The project will be combined with the excellent removal ability of layered chalcogenides and the separation ability of magnetic nanoparticles. The magnetic layered chalcogenides composite adsorbent will be prepared by crosslinking agent such as 3-mercaptopropionic acid. The relationship between the removal of typical PPCPs and surface properties, interlayer spacing, morphology, composite method and composite proportion of magnetic layered chalcogenides composite adsorbent will be systematically investigated. And the controllable preparation methods of magnetic layered chalcogenides composite adsorbent will also be established. The removal mechanisms of magnetic layered chalcogenides composite adsorbent for the removal of typical PPCPs will be clarified at different water quality conditions and process parameters. The collaborative control based on the surface adsorption, ion exchange, electrostatic interaction and hydrophilic/hydrophobic interaction will be established. The recycle ability and removal performance of magnetic layered chalcogenides composite adsorbent will be enhanced by improving its preparation method and the formulation of the regeneration solution. This project will provide the basis in theory and technique for the engineering management of PPCPs pollution.

针对城市污水处理厂出水中的PPCPs污染及其所致人体健康问题，研究和发展典型PPCPs污染去除新技术。项目结合层状硫属化合物的优异去除性能和磁性纳米颗粒的分离能力，以3-巯基丙酸等作为交联剂制备磁性层状硫属复合吸附剂。系统研究磁性层状硫属复合吸附剂的表面性质、层间距、形貌、复合方式和复合比例与去除典型PPCP的关系，建立磁性层状硫属复合吸附剂的可控制备方法。重点阐明在不同水质条件和工艺参数下，磁性层状硫属复合吸附剂对典型PPCPs的去除机制，建立基于表面吸附、离子交换、静电作用、亲疏水作用等过程协同的微界面调控方法。通过改进磁性层状硫属复合吸附剂的构筑和再生液的配方，强化复合吸附剂的循环利用能力及对典型PPCPs的去除性能。项目的开展将为PPCPs污染的工程治理提供科学依据和技术基础。

层状硫属化合物具有优异的吸附性能，为了解决吸附后与水体分离的问题，制备可以磁性分离的复合吸附剂。以L-赖氨酸为交联剂，在水溶液中成功制备了具有良好磁性分离能力的KMS-1/L-Cystein/Fe3O4磁性层状硫属复合吸附剂。为了进一步完善制备方法，研究了乙醇与水作为溶剂的区别，发现粉末颗粒在乙醇中更利于分散。以乙醇为溶剂，在没有添加交联剂的情况下，结合层状硫属化合物和Fe3O4各自所带相反电性的特点，直接通过机械搅拌混合制备了两种磁性层状硫属复合吸附剂，包括Fe3O4/KMS-1和Fe3O4/CMS。通过SEM、XRD、磁性测试等表征，表明Fe3O4能牢固且均匀附着在层状硫属化合物表面，且复合吸附剂吸附后还能具有良好的磁性分离能力。研究了KMS-1/L-Cystein/Fe3O4（KCF）和Fe3O4/KMS-1分别对环丙沙星和诺氟沙星的吸附性能，考察了初始浓度、吸附时间、pH等因素的影响，表明复合吸附剂能有效去除水中的环丙沙星或者诺氟沙星。通过循环吸附测试和XRD、FT-IR、EDS和SEM等表征，研究了KMS-1对诺氟沙星的吸附剂和解析机理。项目为磁性硫属复合吸附剂应用于PPCPs污染的工程治理提供技术基础。