吸附
阻燃剂
环氧树脂
共价键
人体净化
共价有机骨架
聚合
化学工程
水溶液中的金属离子
化学
铜
朗缪尔吸附模型
朗缪尔
放热反应
金属
材料科学
有机化学
废物管理
聚合物
工程类
作者
Yuling Xiao,Chao Ma,Ziyu Jin,Chenyu Wang,Junling Wang,Huijuan Wang,Xiaowei Mu,Lei Song,Yuan Hu
标识
DOI:10.1016/j.seppur.2020.118119
摘要
A key challenge for decontamination technologies is to study adsorbents possessing abundant approachable binding sites to realize rapid and effective capture of heavy metal ions in contaminated water. Herein, a three-dimensional porous covalent organic framework (COF) was synthesized, which can function as a scaffold for decorative binding sites. Considering the plentiful functional groups such as catechol groups of polydopamine (PDA), the decoration is demonstrated by coating PDA on the surface of COF via self-polymerization of dopamine under alkaline conditions. The obtained PDA-coated COF ([email protected]) shows high affinity for copper ions (Cu (II)), while its adsorption capacity reaches 109.2 mg g−1 according to the Langmuir fitting. It takes only 10 min to achieve adsorption equilibrium and its equilibrium data follows pseudo-second-order kinetic model. Thermodynamic studies confirmed a spontaneous and exothermic removal process in essence. To achieve cyclic utilization of Cu (II), the adsorbed Cu (II) ions were heat-treated into CuO to obtain CuO-loaded [email protected] ([email protected]@CuO). It can serve as flame retardant for reducing fire hazards (heat, smoke and toxic gas) of epoxy resin (EP), thus confirming its dual functionalities towards environmental remediation and application as flame-retardant.
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