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Phenol hydrogenation to cyclohexanone over palladium nanoparticles loaded on charming activated carbon adjusted by facile heat treatment

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2600-2606页

作者： Chunhua Zhang guangxin Yang Hong Jiang Yefei Liu Rizhi Chen Weihong Xing State key laboratory of materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China Changzhou key laboratory of Eco-Textile Technology Changzhou Vocational Institute of Textile and GarmentChangzhou 213164China

Selective phenol hydrogenation is a green approach to produce *** still remains a big challenge to prepare efficient supports of the catalysts for the phenol hydrogenation via a simple and cost-effective ***,a facile approach was developed,i.e.,direct calcination of activated carbon(AC)under argon at high temperature,to improve its structure and surface *** modified AC materials were supported with Pd nanoparticles(NPs)to fabricate the Pd/C *** as-prepared Pd/C600 catalyst exhibits superior catalytic performance in the phenol hydrogenation,and its turnover frequency(TOF)value is 199.2 h^-1,1.31 times to that of Pd/*** Pd/C600 catalyst presents both better hydrophobicity and more structural defects,contributing to the improved dispersibility in the reaction solution(phenol-cyclohexane),the better Pd dispersion and the smaller Pd size,which result in the enhancement of the catalytic ***,the as-prepared Pd/C600 catalyst shows a good recyclability.

关键词： Cyclohexanone Phenol Hydrogenation Activated carbon Catalyst

Fabrication and characterization of anodic oxide nanotubes on TiNb alloys

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Rare Metals 2016年第2期35卷 140-148页

作者： Ming Jin Xin Lu Yi Qiao Lu-Ning Wang Alex A.Volinsky School of materials Science and Engineering University of Science and Technology Beijing State key laboratory for Advanced Metals and materials University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

Titanium and its alloys have been extensively used as implant materials owing to their high specific strength, good biocompatibility and excellent corrosion resistance. Oxide nanotubular array layer can be formed on Ti alloy surface by electrochemical anodization treatment. In this work, the morphology of nanotubes formed on Ti-Nb alloys（Nb content of 5 wt%, 10 wt%, 20 wt%, 30 wt% and40 wt%） was investigated using an electrolyte containing ethylene glycol and NH_4 F. Oxide layers consisting of highly ordered nanotubes with a range of diameters（approximately40-55 nm for the inner diameter and 100-120 nm for the outer diameter） and lengths（approximately 10-20 lm） can be formed on alloys in the Ti-x Nb system, independent on the Nb content. The nanotubes formed on the Ti-Nb alloy surface were transformed from the anatase to rutile structure of titanium oxide. The oxide nanotubular surface is highly hydrophilic compared with the intact Ti Nb foil. The surface wettability varies with the nanotube diameter. As the nanotube diameter increases while the nanotube layer thickness remains constant, the capillary wetting of the nanotube surface decreases and the surface becomes less *** changes the nanotubular surface wettability further and establishes less hydrophilic surface conditions due to the removal of hydroxyl groups and residue fluoridecontaining species. It is believed that the surface wettability is changed due to the decreasing content of hydroxyl groups in ambient atmosphere. This work can provide guidelines for improving structural and environmental conditions responsible for changing surface wettability of Ti Nb surfaces for biomedical applications.

关键词： Ti-Nb alloy Anodization Nanotubes Wettability Implants

Degradation of tiamulin by a packed bed dielectric barrier plasma combined with TiO_(2)catalyst

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Plasma Science and Technology 2022年第9期24卷 117-126页

作者： Kun YANG Hongwei SHEN Yueyue LIU Yang LIU Pingji GE Dezheng YANG School of Science Shihezi UniversityShihezi 832003People’s Republic of China key laboratory of Environmental Monitoring and Pollutant Control of Xinjiang Bingtuan Shihezi UniversityShihezi 832003People’s Republic of China key Lab of materials Modification Dalian University of TechnologyMinistry of EducationDalian 116024People’s Republic of China

Recently,a plasma catalyst was employed to efflciently degrade antibiotic residues in the *** this study,the plasma generated in a packed bed dielectric barrier reactor combined with TiO_(2)catalyst is used to degrade the antibiotic tiamulin(TIA)loaded on the surface of simulated soil *** effects of applied voltage,composition of the working gas,gas flow rate and presence or absence of catalyst on the degradation effect were *** was found that plasma and catalyst can produce a synergistic effect under optimal conditions(applied voltage 25 k V,oxygen ratio 1%,gas flow rate 0.6 l min^(-1),treatment time 5 min).The degradation efflciency of the plasma combined with catalyst can reach 78.6%,which is 18.4%higher than that of plasma without *** the applied voltage is 30 k V,the gas flow rate is 1 l min^(-1),the oxygen ratio is 1%and the plasma combined with TiO_(2)catalyst treats the sample for 5 min the degradation efflciency of TIA reached 97%.It can be concluded that a higher applied voltage and longer processing times not only lead to more degradation but also result in a lower energy *** the oxygen ratio and gas flow rate could improve the degradation *** relative distribution and identity of the major TIA degradation product generated was determined by high-performance liquid chromatography–mass spectrometry *** mechanism of TIA removal by plasma and TiO_(2)catalyst was analyzed,and the possible degradation path is discussed.

关键词： packed bed dielectric barrier discharge plasma catalyst tiamulin(TIA)antibiotics degradation degradation mechanism

Advanced Heteroatom-Doped Porous Carbon Membranes Assisted by Poly(ionic liquid)Design and Engineering

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Accounts of materials Research 2020年第1期1卷 16-29页

作者： Yucheng Wang Yue Shao Hong Wang Jiayin Yuan Department of materials and Environmental Chemistry Stockholm University10691 StockholmSweden key laboratory of Functional Polymer materials(Ministry of education) Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071P.R.China

CONSPECTUS:Heteroatom-doped porous carbon membranes(HPCMMs)with a tailor-made pore architecture,chemical composition,atomic structural order,and surface state represent an exciting family of porous carbon materials for diverse potential applications in catalysis,water treatment,biofiltration,energy conversion/storage,and so *** porous carbon membranes possess intrinsic structural integrity,interconnectivity,and chemical purity across the atomic-to-macro world and have been popularly incorporated into devices as separators or chemically inert conductive supports,circumventing otherwise the inevitable complicated processing and structure weakness of their fine powderous *** by the distinguished heteroatom-doping effect that revolutionizes the chemical and physical nature of carbon materials,the HPCMM research surges very recently,and focuses not only on the eminent conductive supports or separators but also on electro(co)catalysts in energy *** of the porous nature,incorporation of heteroatoms,and the membrane state creates a vivid profile pattern and new task-specific *** is also noteworthy that the inherent structural merits of HPCMMs plus a high electron conductivity imbue them as a reliable binder-free model electrode to derive the intrinsic structure−property relationship of porous carbons in electrochemical environments,excluding the complex and adverse factors in association with polymer binders in carbon powder-based *** are of both intense academic interest and practical value because of their well-defined properties endowed by controllable structure and porosity at both atomic and macroscopic scales in a membrane *** sole aim of this article is to bring this group of porous carbon materials to the forefront so their comprehensive properties and functions can be better understood to serve the carbon community to address pressing materials challenges in our *** this Account,we highligh

关键词： porous ionic doping

Selective separation of oil-in-water emulsion with high efficiency by bio-inspired Janus membrane

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Science China(Technological Sciences) 2021年第10期64卷 2211-2219页

作者： CAI YaHui CHEN DongYun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Co-Innovation Center of Efficient processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China

The efficient and rapid separation of oil from stabilized oil-in-water emulsions with micro/nanometer size is a global *** to the low oil content in oil-in-water emulsions,separating the oil by simply controlling the surface wettability is *** the pore size of the membrane surface to achieve separation will lead to a sharp decrease in ***,inspired by cell membrane transportation,a hydrophilic/hydrophobic bifunctional Janus membrane for stable oil-in-water separation was prepared by simple surface polymerization and vapor *** prepared Janus membrane contained a hydrophobic side and hydrophilic polyamine *** used for oil-in-water emulsion separation,the polyamine layer accumulated micro/nanometer oil droplets,forming an oil layer on the hydrophobic *** was retained by the 1H,1H,2H,2H-perfluorooctyl trichlorosilane layer,allowing oil droplets to selectively permeate through the membrane,achieving the separation *** the pore size of the modified fabric was basically unchanged,the permeation flux was fast(1.53×10^(3) Lm^(−2) h^(−1)).Furthermore,the poly(N,N-dimethylaminoethyl methacrylate)layer destroyed the emulsion stability,making the emulsion droplets aggregate without affecting the separation efficiency with fast permeation ***,the prepared bifunctional Janus membrane shows great potential for actual wastewater treatment.

关键词： bifunctional Janus membrane demulsification function oil-in-water emulsion separation superhydrophobicity/superoleophilicity surface chemistry

Dry passivation of austenitic SUS 301L stainless steel against pitting corrosion in marine atmospheric environment

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Journal of Oceanology and Limnology 2022年第4期40卷 1437-1447页

作者： Yonghong LU Xiao LIU Lisha WANG Jinghong YANG Haibo XU key laboratory of Marine Chemistry Theory and Technology Ministry of Education College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China 2 CRRC Changchun Railway Vehicles Co.Ltd.Changchun 130062China

Being an exclusive construction material for lightweight rail vehicles,protection from pitting corrosion in harsh marine atmospheric environment in high humidity and Cl-ion concentration is critical for austenitic SUS 301L stainless steel(SS),especially when it inevitably suff ers from mechanical damages during post ***,an innovative dry passivation method for austenitic SUS 301L SS was established in a closed air atmosphere at low temperature and constant *** process parameters were optimized,and the passivation mechanism was explained using polarization curve,electrochemical impedance spectroscopy(EIS),X-ray photoelectron spectroscopy(XPS),and contact angle *** pitting corrosion susceptibility of the passive fi lm prepared in a closed air chamber under 1.0×10^(5) Pa at 80℃ for 80 min was evaluated in 3.5%NaCl solution and exhibited higher pitting potential and corrosion resistance,lower passivity-maintaining current density,and wettability when compared with conventional nitric acid ***,dry passivation facilitated the repairing of the surface structural defect itself and the post-processing damage,similar to the accelerated aging of fi *** decrease in oxygen concentration and convection-diff usion strengthened the preferential chromium oxidation to form a compact chromium-rich passive fi lm to resist the aggression of Cl-ion.

关键词： austenitic stainless steel passive film dry passivation pitting corrosion chloride ion