Natural high-porous diatomaceous-earth based self-floating aerogel for efficient solar steam power generation  

作　　者：Aitang Zhang Kai Wang Md Julker Nine Mengyu Cao Hanwen Zong Zhiqiang Liu Hanwen Guo Jingquan Liu Dusan Losic 

机构地区：[1]College of Materials Science and Engineering,Institute for Graphene Applied Technology Innovation,Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province,Qingdao University,Qingdao,266071,China [2]The University of Adelaide,School of Chemical Engineering and Advanced Materials,ARC Graphene Research Hub,North Engineering Building,N206 Adelaide,SA 5005,Australia

出　　处：《Green Energy & Environment》2024年第2期378-389,共12页绿色能源与环境（英文版）

基　　金：the Qingdao Innovation Leading Talent Program,National Natural Science Foundation of China(21805124);Natural Science Foundation of Shandong Province(ZR2018BEM020).

摘　　要：The application of solar steam generation in seawater desalination is an effective way to solve the shortage of fresh water resources.At present,many kinds of photothermal conversion materials have been developed and used as evaporators in seawater desalination.However,some evaporators need additional thermal insulation or water supply devices to achieve efficient photothermal conversion.In addition,their complex,time consuming and no scalable preparation process,high cost of raw materials and poor salt resistance hinder the practical application of these evaporator.Owing to its distinctive nanoporous structure,diatomite as fossilized single-cells algae diatoms is a promising natural silica-based material for seawater desalination.They are taken from sea and that makes true sense to use them in the sea.Herein,we report the first example of synthesis robust three-dimensional(3D)natural-diatomite composite by assembling polyaniline nanoparticles covered diatomite into the polyvinyl alcohol pre-treated melamine foam frameworks and demonstrate its application as new evaporator for seawater desalination.The porous framework does not only improve the sunlight scattering efficiency,but also offer large network of channels for water transportation.The inherent mechanism behind salt desalination process involves the absorption of water molecules on the surface of the internal silica micro-nano pores,and evaporation under the heat induced by the polyaniline absorbed sunlight.Meanwhile,the metal ions are segregated by many available pores and channels to achieve the self-desalting effect.The developed evaporator possesses the superiority of multi-stage pore structure,strong hydrophilicity,low thermal conductivity,excellent light absorption,fast water transportation and salt-resistant crystallization as well as good durability.The evaporation rate without an additional device is found to be 1.689 kg m^(-2)h^(-1)under 1-Sun irradiation,and the energy conversion efficiency is as high as 95%.This work creates a platform and dev

关 键 词：DIATOMITE Micro/nanopores Polyaniline Three-dimensional composite Solar steam generation 

分 类 号：TM615[电气工程—电力系统及自动化]