Superhydrophilic Polydopamine‑Modified Carbon‑Fiber Membrane with Rapid Seawater‑Transferring Ability for Constructing Efficient Hanging‑Model Evaporator  

作　　者：Wenmei Chong Ruru Meng Zixiao Liu Qiyue Liu Jinjing Hu Bo Zhu Daniel KMacharia Zhigang Chen Lisha Zhang 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China [2]College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China

出　　处：《Advanced Fiber Materials》2023年第3期1063-1075,共13页先进纤维材料（英文）

基　　金：financially by National Key Research and Development Program of China(2022YFB3804902,2022YFB3804900);the National Natural Science Foundation of China(52161145406,51972056);Program of Shanghai Academic Research Leader(20XD1420200);the Natural Science Foundation of Shanghai(21ZR1402500).

摘　　要：Solar-driven seawater desalination has attracted much attention for alleviating global freshwater shortage,but the practical application is often limited by complicated fabrication processes,unsatisfactory seawater-transferring and severe salt accu-mulation on the photothermal membranes.To solve these problems,hydrophobic industrial-grade carbon fiber membrane(CFM)with good photoabsorption was surface-modified with polydopamine(PDA)to prepare superhydrophilic CFM@PDA for the construction of efficient hanging-model evaporators without salt accumulation.The coating of PDA on CFM is realized by simple self-polymerization of dopamine,and the as-prepared CFM@PDA exhibits high solar absorption effi-ciency of 96.7%,good photothermal effect and superhydrophilicity.Especially,when CFM@PDA is hanging between two water tanks(one contains seawater and the other is empty)in a flat hanging-model evaporator,it can transport seawater at a high rate(26.35 g/h)which is 3.6 times that(7.28 g/h)of commercial cotton fabric.Under simulated sunlight(1.0 kW m^(-2))irradiation,CFM@PDA shows a high evaporation rate of 1.79 kg m^(-2) h^(-1) with a solar evaporation efficiency of 92.6%.Even if NaCl solution with a high concentration(21.0 wt%)is used for the evaporation,the hanging CFM@PDA can retain a high evaporation rate(~1.80 kg m^(-2) h^(-1))without salt accumulation during the long-time test(8 h),which is significantly better than that of the tradition floating model.Therefore,this study not only demonstrates the simple preparation of super-hydrophilic CFM@PDA,but also promotes the further practical applications of hanging-model evaporators for continuous salt-free desalination.

关 键 词：Carbon fiber membrane POLYDOPAMINE SUPERHYDROPHILICITY Hanging-model evaporator Solar-driven seawater desalination 

分 类 号：TB33[一般工业技术—材料科学与工程]