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Preparation of superhydrophobic CdS cotton using visible light response and its application for the control of water pollution

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Science China(Technological Sciences) 2019年第12期62卷 2236-2242页

作者： GE Bo REN GuiNa ZHAO PengFei JIN ChuanYu LI WenZhi zhang zhaozhu School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China School of Environmental and Material Engineering Yantai UniversityYantai 264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Sewage discharge produced by homes and industries contains both oil and water-soluble components. In order to remove oil from water, materials with specific wettability can be used;however, these materials cannot remove dissolved contaminants from water. In this research, we prepared a superhydrophobic Cd S cotton for water purification. This material has the ability to adsorb different types of oil due to its non-wettability(WCA = 152°). Moreover, its response behavior towards visible light enables it to remove water-soluble pollutants as well. The highest oil absorption rate of superhydrophobic Cd S cotton is nearly 30 times, and it can absorb light below 564 nm and produce ·OH to degrade water soluble pollutants. Finally, based on Mott-Schottky curve,the position of Fermi energy level was determined(–0.55 e V). Also, the positions of valence and conduction bands were calculated based on the analysis of band gap which helps in proving photoelectric response characteristics.

关键词： superhydrophobic cotton CdS photocatalytic

A sponge-based iron-tannic-acid hydrogel interface evaporator designed for clean water production

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Science China(Technological Sciences) 2024年第5期67卷 1579-1591页

作者： zhang ZeKun LI ChengLong TAO HuaYu GE Bo zhang YongLe ZHAO LiMin LIU JunChang REN GuiNa zhang zhaozhu School of Materials Science and Engineering Liaocheng UniversityLiaocheng252059China School of Environmental and Material Engineering Yantai UniversityYantai264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China

Due to the rapid advancement of technologies,there has been a significant increase in the discharge of industrial wastewater,and freshwater is becoming a scarce ***,research on solar evaporators is mainly focused on the efficient production of clean water,with less emphasis on the removal of residual pollutants remaining in the original *** this study,problems,including the difficult recovery of catalyst powder and the difficult removal of floating organic matter are solved by co-depositing low-surface-tension zirconia particles and bismuth tungstate onto the floating *** and melamine sponges were combined to solve the problem that traditional hydrogels lack mechanical *** excellent water-repellent effect can be seen from the contact angle between the liquid globule and canvas/felt,which is greater than 155°.The steam generation rate of the assembled evaporation system is 1.78 kg m^(-2)h^(-1),and its purification efficiency for methyl orange and rhodamine B exceeds 99%.This study presents a novel strategy for treating wastewater contaminated with organic dyes,aiming to solve problems including environmental damage,water pollution,and water scarcity.

关键词： oil removal non-wetting interface

In situ reduction and functionalization of graphene oxide to improve the tribological behavior of a phenol formaldehyde composite coating

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Friction 2015年第1期3卷 72-81页

作者： Mingming YANG zhaozhu zhang Xiaotao ZHU Xuehu MEN Guina REN State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesTianshui Road 18thLanzhou 730000China University of Chinese Academy of Sciences Beijing 100039China

The development of a phenol formaldehyde/graphene(PF-graphene)composite coating with high performance is desirable but remains a challenge,because of the ultrahigh surface area and surface inertia of the ***,we synthesized PF-graphene composites by the in situ polymerization of phenol and formaldehyde with the addition of graphene oxide,resulting in improved compatibility between the graphene and phenolic resin(PF)matrix and endowing the phenolic resin with good thermal stability and excellent tribological ***-transform infrared(FTIR)spectra and X-ray diffraction(XRD)patterns demonstrated that the graphene oxide was reduced during the in-situ *** PF-graphene composites were sprayed onto steel blocks to form composite *** effects of an applied load and of the sliding speed on the tribological properties of the PF-graphene composite coating were evaluated using a block-on-ring wear tester;in addition,the worn surface and the transfer film formed on the surface of the counterpart ring were studied by scanning electron microscopy(SEM).The results show that the PF-graphene composite coating exhibited enhanced tribological properties under all tested conditions.

关键词： wear friction graphene phenolic resin

Surface modification of YS-20 with polydopamine for improving the tribological properties of polyimide composites

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Friction 2022年第3期10卷 411-421页

作者： Liangfei WU zhaozhu zhang Mingming YANG Junya YUAN Peilong LI Zujun CHEN Xuehu MEN State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

Recently,great effort has been devoted to prepare various reinforce fillers to improve polymer performances,but ignoring the importance of raw polymer powders which are indispensable parts of hot-pressed polymer ***,we engineer raw polyimide(PI)powders with the assistance of polydopamine(PDA)in aqueous *** the modification,polymer powders change from hydrophobic to hydrophilic,which makes it is possible to further modification of polymer powders in liquid *** the curing process of modified polymer powders,the partial dehydration of the catechol groups and crosslinking of PDA via C–O–C bonds are *** on the features of PDA,a non-destructive mixing method is utilized to realize homogeneous dispersion of multi-walled carbon nanotubes(MWCNTs)in polymer *** comparison with ball milling method,this way can preserve the integrated innate structure of MWCNTs ***,by taking full advantage of the reducing and metal-coordination capability of PDA,Cu2+is successfully loaded onto the surfaces of polymer *** related characterizations demonstrate that Cu2+in situ converts to metallic copper rather than copper oxide during the hot pressing *** tribological properties of corresponding polymer composites are also *** results indicate that modifying polymer powders with PDA is multi-profit and presents practical application prospect.

关键词： polydopamine(PDA) carbon nanotube metallic copper wear resistance

Sliding wear behaviors of Nomex fabric/phenolic composite under dry and water-bathed sliding conditions

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Friction 2014年第3期2卷 264-271页

作者： Guina REN zhaozhu zhang Xiaotao ZHU Xuehu MEN Wei JIANG Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesTianshui Road 18thLanzhou 730000PR China University of Chinese Academy of Sciences Beijing 100039PR China

A Nomex fabric/phenolic composite was prepared,and its tribological properties were evaluated under dry and water‐bathed sliding conditions by a pin‐on‐disk *** resulting size of the friction coefficient for the Nomex fabric/phenolic composite in the study occurred in the following order:dry sliding condition>distilled water‐bathed sliding condition>sea water‐bathed sliding *** fabric composite’s wear rate from high to low was as follows:distilled water‐bathed sliding condition>sea water‐bathed sliding condition>dry sliding *** water‐bathed sliding conditions,penetration of water into the cracks accelerated the composite’s invalidation process,resulting in a higher wear *** also found that the extent of corrosion and transfer film formed on the counterpart pin significantly influenced the wear rate of the Nomex fabric *** of the Nomex fabric composite’s wear mechanisms under the sliding conditions investigated is provided on the basis of the characterization results.

关键词： Nomex fabric/phenolic composite friction and wear property dry and water‐bathed sliding condition

Halloysite‒gold core‒shell nanosystem synergistically enhances thermal conductivity and mechanical properties to optimize the wear-resistance of a pheonlic-PBO/PTFE textile composite liner

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Friction 2023年第12期11卷 2238-2252页

作者： Yanling WANG zhaozhu zhang Meng LIU Yaohui HE Peilong LI Junya YUAN Mingming YANG Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Polymer-textile liner composites have potential applications in aerospace applications for reducing the abrasion damage of moving parts during operation owing to their self-lubrication,light weight,and high loading ***,Au nanoparticles(AuNPs)are successfully loaded into the lumen of halloysite nanotubes(HNTs)to construct an HNTs‒Au peasecod core‒shell nanosystem to optimize the wear resistance of phenolic resin-based poly(p-phenylene benzobisoxazole)(PBO)/polytetrafluoroethylene(PTFE)textile *** electron microscope(TEM)characterization reveals that the AuNPs are well-dispersed inside the HNTs,with an average diameter of 6‒9 *** anti-wear performance of the HNTs and Au-reinforced PBO/PTFE composites is evaluated using a pin-on-disk friction tester at 100 ***,the addition of HNTs‒Au induces a 27.9%decrease in the wear rate of the *** anti-wear mechanisms are proposed based on the analyzed results of the worn surface morphology and the cross-section of the tribofilm obtained by focused ion beam transmission electron microscopy.

关键词： textiles composites core‒shell wear halloysite

Fabrication of BiOBr-silicone aerogel photocatalyst in an aqueous system with degradation performance by sol-gel method

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Science China(Technological Sciences) 2020年第5期63卷 859-865页

作者： GE Bo REN GuiNa YANG Hang YANG JingJing PU XiPeng LI WenZhi JIN ChuanYu zhang zhaozhu School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China School of Environmental and Material Engineering Yantai UniversityYantai 264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

It is a challenge to endow the material with the ability to pollutants degradation while maintaining the oil/water separation performance. Herein, the mixed dispersion of BiOBr photocatalyst and silicone sol was adsorbed in melamine foam. Superhydrophobic BiOBr-silicone aerogel(WCA=154°) was obtained through the transfer melamine foam to an autoclave and reaction at 80℃ for 20 h. The prepared superhydrophobic BiOBr-silicone aerogel can effectively remove the water soluble pollutants which remain within the water phase after oil/water separation. The band gap of the superhydrophobic BiOBr-silicone aerogel was calculated to be 2.71 eV, which shows sensitivity to visible light(458 nm). Through mechanism analysis, it is found that the VB position of BiOBr is at 1.07 eV and the position of CB is at-1.64 eV. Finally, we prepared a superhydrophobic BiOBr-silicone aerogel(5 cm×5 cm×3 cm) for the verification of the large scale preparation.

关键词： BiOBr silicone aerogel melamine sponge water purification

Fabrication of Bionic Superhydrophobic Manganese Oxide/Polystyrene Nanocomposite Coating

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Journal of Bionic Engineering 2012年第1期9卷 11-17页

作者： Xianghui Xu zhaozhu zhang Fang Guo Jin Yang Xiaotao Zhu Xiaoyan Zhou Qunji Xue State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 P. R. China Graduate School Chinese Academy of Sciences Beijing 100039 P. R. China

A superhydrophobic manganese oxide/polystyrene （MnO2/PS） nanocomposite coating was fabricated by a facile spraying process. The mixture solution of MnO2/PS was poured into a spray gun, and then sprayed onto the copper substrate using 0.2 MPa nitrogen gas to construct superhydrophobic coating. The wettability of the composite coating was measured by sessile drop method. When the weight ratio of MnO2 to PS is 0.5：1, the maximum of contact angle （CA）（140°） is obtained at drying temperature of 180 ℃. As the content of MnO2 increases, the maximum of CA （155°） is achieved at 100 ℃. Surface morphologies and chemical composition were analyzed to understand the effect of the content of MnO2 nanorods and the drying temperature on CA. The results show that the wettability of the coating can be controlled by the content of MnO2 nanorods and the drying temperature. Using the proposed method, the thickness of the coating can be controlled by the spraying times. If damaged, the coating can be repaired just by spraying the mixture solution again.

关键词： bionics superhydrophobic surface MnO2 nanorods nanocomposite coating drying temperature

Fabrication of PTFE/Nomex fabric/phenolic composites using a layer-by-layer self-assembly method for tribology field application

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Friction 2020年第2期8卷 335-342页

作者： Mingming YANG zhaozhu zhang Junya YUAN Liangfei WU Xin ZHAO Fang GUO Xuehu MEN Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100039China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

Fabric composites are widely applied as self-lubricating liner for radial spherical plain bearings owing to their excellent mechanical and tribological ***,the poor interfacial strength between fibers and the resin matrix limits the performance of composites utilized as *** overcome this drawback,a mild layer-by-layer(LbL)self-assembly method was successfully used to construct hybrid fabric composites in the present *** addition,this investigation addressed the effect of self-assembly cycles on the friction and wear behaviors of hybrid fabric composites under dry sliding *** results demonstrate that fabric composites with three or more self-assembly cycles have significantly enhanced surface activities and anti-wear *** results obtained in this work can provide guidance in the preparation of self-lubricating liner composites and highlight how the LbL self-assembly techniques could influence the properties of hybrid fabric composites.

关键词： LbL self-assembly hybrid fabric wear friction