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A bifunctional wood membrane modified by MoS_(2)/covalent organic framework heterojunctions for effective solar-driven water evaporation and contaminant degradation

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Science China Chemistry 2024年第6期67卷 2111-2120页

作者： Ziwei Cui Jianfei Wu Haoran Li Yaning Xu Tiantian Wu Lixing Kang Qing Huang Yahui Cai Jianzhang Li Dan Tian Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing100083China

Interfacial solar evaporation technology is considered one of the most promising strategies for alleviating the scarcity of freshwater resources.However,solar-driven evaporation technology cannot eliminate the pollutants in the residual wastewater.To solve this problem,we have prepared a two-in-one solar-driven evaporation/photocatalysis system by decorating MoS_(2)/covalent organic framework(COF)heterojunctions on wood(MoS_(2)/COF-wood).Thanks to the unique porous structure of wood,it provides a strong guarantee for water transport and vapor release during the evaporation process.The introduction of MoS_(2) and COFs can promote the breaking of hydrogen bonds between water molecules,which leads to a significant decrease in the enthalpy of evaporation,achieving a water evaporation rate as high as 2.17 kg m^(-2)h^(-1)under 1 sun irradiation.Meanwhile,the resulting MoS_(2)/COF-wood exhibits good salt resistance and reusability.In addition,the heterojunctions formed between COFs and MoS_(2) can effectively inhibit charge carrier complexation and improve the photocatalytic degradation ability of pollutants(over 99%).This study highlights the construction strategy of bifunctional wood-based materials for freshwater production and wastewater remediation.

关键词： covalent organic framework MoS_(2) wood photocatalysis solar-driven evaporation

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Multifunction Zno/carbon hybrid nanofiber mats for organic dyes treatment via photocatalysis with enhanced solar-driven evaporation

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Frontiers of Materials Science 2022年第4期16卷 93-104页

作者： Wenxin WANG Yang CHEN Ning WANG Zhiqiang DU Martin JENSEN Zihan AN Xianfeng LI State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Municipal Key Lab of Advanced Energy Storage Material and DevicesSchool of Material Science and EngineeringTiangong UniversityTianjin 300387China Department of Chemistry and Bioscience Aalborg UniversityDK-9220 AalborgDenmark The Institute of Seawater Desalination and Multipurpose Utilization(MNR) Tianjin 300192China

ZnO-based photocatalytic materials have received widespread attention due to their usefulness than other photocatalytic materials in organic dye wastewater treatment.However,its photocatalytic efficiency and surface stability limit further applicability.This paper uses a one-step carbonization method to prepare multifunctional ZnO/carbon hybrid nanofiber mats.The carbonization creates aπ-conjugated carbonaceous structure of the mats,which prolongs the electron recovery time of ZnO nanoparticles to yield improved photocatalytic efficiency.Further,the carbonization reduces the fiber diameter of the carbon hybrid nanofiber mats,which quadruples the specific surface area to yield enhanced adsorption and photocatalytic performance.At the same time,the prepared nanofiber mats can increase the evaporation rate of water under solar irradiation to a level of 1.46 kg·m^(-2)·h^(-1)with an efficiency of 91.9%.Thus,the nanofiber mats allow the facile incorporation of photocatalysts to clean contaminated water through adsorption,photodegradation,and interfacial heat-assisted distillation mechanisms.

关键词： hybrid nanofiber mats zinc oxide photocatalysis solar-driven evaporation

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Oil-polluted water purification via the carbon-nanotubes-doped organohydrogel platform

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Nano Research 2022年第6期15卷 5653-5662页

作者： Xuetao Xu Xizi Wan Haonan Li Yikai Zhang Wen He Shuli Wang Miao Wang Xu Hou Shutao Wang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China College of Materials Xiamen UniversityXiamen 361005China College of Physical Science and Technology Xiamen UniversityXiamen 361005China University of Chinese Academy of Sciences Beijing 100049China

solar-driven evaporators are promising for tackling freshwater scarcity but still challenged in simultaneously realizing comprehensive performances at one platform for sustainable and efficient application in real-world environments,such as stablefloating,scalability,salt-resistance,efficient vaporization,and anti-oil-fouling property.Herein,we design a hybrid organohydrogel evaporator to achieve the enduring oil contamination repulsion with maintaining accelerated evaporation process,and integrate capacities of ultra-stable floating,hindered salt-crystallization,large-scale fabrication for practical purification of seawater and polluted solutions.The raised water surface surrounding evaporators,induced by low density of organogel-phase,results in oil contamination resistance through the lateral capillary repulsion effect.Meanwhile,the organogel-phase containing photo-thermal carbon-nanotubes with low thermal capacity and conduction can form locally confined hot dots under solar irradiation and reduce heat dissipation on heating excessive water.Therefore,based on this approach,accelerated long-term practical purification of oilcontaminated solutions without any extra disposal is realized.Considering other properties of ultra-stable floating,large-scale fabrication,and anti-salt crystallization,these innovative organohydrogel evaporators open pathways for purifying oil-slickpolluted water via interfacial evaporation and are anticipated accelerating industrialization of efficient and sustainable solar-driven water purification.

关键词： solar-driven evaporation organohydrogel anti-oil-fouling thermal management ultra-stable floating

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Preparation of Three-dimensional Graphene-based Sponge as Photo-thermal Conversion Material to Desalinate Seawater

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Chemical Research in Chinese Universities 2022年第6期38卷 1425-1434页

作者： ZHANG Huan LIU Huie CHEN Shuang ZHAO Xinxin YANG Fan TIAN Xiaowen College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao266580P.R.China

Water shortage has become one of the major threats to human society over the past centuries.The new interfacial solar evaporation is undoubtedly an attracting technology to solve this problem.Herein,graphene aerogel(GA)and graphene oxide/melamine sponge composite material(GO-MS)were prepared through a two-step reduction and one-step freezing method as photo-thermal materials to evaporate pure water and seawater.The proper concentrations of the graphene oxide(GO)dispersion for their preparation were investigated,which is 7 mg/mL for GA,and 5 mg/mL for GO-MS.The evaporation rates of GA are 1.40 kg/(m^(2)·h)for pure water and 1.21 kg/(m^(2)·h)for seawater,while for GO-MS it is 1.63 kg/(m^(2)·h)for pure water and 1.45 kg/(m^(2)·h)for seawater,respectively.The composite material not only reduces the usage of GO,but also shows better photo-thermal conversion properties.Furthermore,the heat loss of evaporation system was calculated and the method of further enhancing photo-thermal conversion efficiency was deduced,which will provide a strong basis for guiding the design and development of graphene based three-dimensional materials and further exploration in this field.

关键词： Graphene Melamine sponge Photo-thermal material solar-driven evaporation Heat conduction

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Reduced graphene oxide-based calcium alginate hydrogel as highly efficient solar steam generation membrane for desalination

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Frontiers of Materials Science 2021年第1期15卷 138-146页

作者： Gang LOU Yizhi WANG Yun MA Jianlong KOU Fengmin WU Jintu FAN Zhejiang Provincial Key Laboratory of Solid State Optoelectronic Devices Zhejiang Normal UniversityJinhua 321004China Department of Fiber Science and Apparel Design Cornell UniversityIthacaNew York 14853-4401USA

solar-driven evaporation has been considered as one of the potentialmethods for desalination and sewage treatment.However,optical concentrators andcomplex multi-component systems are essential in advanced technologies,resulting inlow efficiency and high cost.Here,we synthesize a reduced graphene oxide-basedporous calcium alginate(CA-rGO)hydrogel which exhibits good performance in lightabsorption.More than 90%of the light in the whole spectrum can be absorbed.Meanwhile,the water vapor escapes from the CA-rGO film extremely fast.The waterevaporation rate is 1.47 kg·m^(-2)·h^(-1),corresponding to the efficiency 77%under only 1 kW'm 2 irradiation.The high evaporation efficiency is attributed to the distinctive structureof the film,which contains inherent porous structure of hydrogel enabling rapid watertransport throughout the film,and the concave water surfaces formed in the hydrophilicpores provide a large surface area for evaporation.Hydrophobic rGO divides theevaporation surface and provides a longer three-phase evaporation line.The test onmultiple cyclic radiation shows that the material has good stability.The CA-rGO hydrogelmay have promising application as a membrane for solar steam generation indesalination and sewage treatment.

关键词： solar-driven evaporation CA-rGO film desalination

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