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Tribological performance of various metal-doped carbon dots as water-based lubricant additives and their potential application as additives of poly(ethylene glycol)

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Friction 2022年第5期10卷 688-705页

作者： Weiwei TANG Xuejun ZHU Yufeng LI School of biological and Chemical engineering Panzhihua UniversityPanzhihua 617000China

Advances in nano-lubricant additives are vital to the pursuit of energy efficiency and sustainable *** dots(CDs)have been widely investigated in the domain of lubricant additives owing to their extraordinary tribological properties,in particular,their friction-reducing and anti-wear ***-doped CDs are a new type of CDs,and their friction-reducing and anti-wear properties are attracting increasing ***,a series of CDs doped with various divalent metal ions have been successfully synthesized via one-pot *** tribological properties of the synthesized CDs as water-based lubricant additives are in the following order:Zn-CDs>Cu-CDs>>Mg-CDs>Fe-CDs>***,adding 1.0 wt%of Zn-CDs into water-based lubricant results in 62.5%friction and 81.8%wear ***,the load-carrying capacity of the water-based lubricant increases from 120 N to at least 500 ***-CDs as an additive have long service ***,anion-tuned Zn-CDs fabricated via anion exchange exhibit promise as lubricant additives for poly(ethylene glycol).Based on the results of wear scar surface analyses,it is discovered that tribochemical films,primarily composed of iron oxides,nitrides,metal carbonates,zinc oxides,zinc carbonates,organic compounds,and embedded carbon cores,formed on the rubbing surfaces with a thickness of approximately 270 nm when Zn-CDs are used as *** film combined with the“ball-bearing”and third-particle effects of Zn-CDs contributed to excellent lubrication performance.

关键词： metal-doped carbon dots(CDs) water-based lubricant additives tribological performance lubrication mechanism

Construction of dual Z-scheme Bi2WO6/g-C_(3)N_(4)/black phosphorus quantum dots composites for effective bisphenol A degradation

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Journal of Environmental Sciences 2023年第2期124卷 617-629页

作者： Fuyou Du Zhan Lai Huiyang Tang Haiyan Wang Chenxi Zhao College of biological and Environmental engineering Changsha UniversityChangsha 410022China

In this work,a novel dual Z-scheme Bi_(2)WO_(6)/g-C_(3)N_(4)/black phosphorus quantum dots(Bi_(2)WO_(6)/g-C_(3)N_(4)/BPQDs)composites were fabricated and utilized towards photocatalytic degradation of bisphenol A(BPA)under visible-light *** the content of g-C_(3)N_(4) and BPQDs in Bi_(2)WO_(6)/g-C_(3)N_(4)/BPQDs composites to a suitable mass ratio can enhance the visible-light harvesting capacity and increase the charge separation efficiency and the transfer rate of excited-state electrons and holes,resulting in much higher photocatalytic activity for BPA degradation(95.6%,at 20 mg/L in 120 min)than that of Bi2WO6(63.7%),g-C_(3)N_(4)(25.0%),BPQDs(8.5%),and Bi_(2)WO_(6)/g-C_(3)N_(4)(79.6%),*** trapping experiments indicated that photogenerated holes(h+)and superoxide radicals(•O_(2)−)played crucial roles in photocatalytic BPA ***,the possible degradation pathway and photocatalytic mechanism was proposed by analyzing the BPA *** also demonstrated that the Bi2WO6/g-C_(3)N_(4)/BPQDs as effective photocatalystswas stable and have promising potential to remove environmental contaminants from real water samples.

关键词： Dual Z-scheme Bi_(2)WO_(6) Graphitic carbon nitride(g-C_(3)N_(4)) Black phosphorus quantum dots (BPQDs) Bisphenol A(BPA)

Required catalytic properties for alkane production from carboxylic acids: Hydrodeoxygenation of acetic acid

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Journal of Energy Chemistry 2013年第6期22卷 883-894页

作者： Zhong He Xianqin Wang Department of Chemical Biological and Pharmaceutical Engineering New Jersey Institute of Technology

The supported Pt catalysts(1 wt%)were prepared by the incipient impregnation method and analyzed using synchrotron-based X-ray diffraction,BET surface area,oxygen adsorption,CO pulse chemisorption,temperature-programmed desorption(TPD)of acetic acid,H2-TPD,NH3-TPD,O2-TPD,and *** reactivity of Pt-based catalysts was studied using a fixed bed reactor at 300 C and 4 MPa for hydrodeoxygenation of acetic acid,where Pt/TiO2 was very selective for ethane *** experiments revealed that several conditions must be satisfied to achieve this high selectivity to ethane from acetic acid,such as Pt sites,moderate acidity,and medium metal-oxygen bond strength in the oxide *** work provides insights in developing novel catalytic materials for hydrocarbon productions from various organics including bio-fuels.

关键词： hydrodeoxygenation ethane acetic acid bio-oil Pt/TiO2 acidity metal-oxygen interaction

Hybridization of metal–organic framework and monodisperse spherical silica for chromatographic separation of xylene isomers

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Chinese Journal of Chemical engineering 2019年第4期27卷 818-826页

作者： Bixuan Gao Minhui Huang Zhiguo Zhang Qiwei Yang Baogen Su Yiwen Yang Qilong Ren Zongbi Bao Key Laboratory of Biomass Chemical engineering of the Ministry of Education College of Chemical and Biological EngineeringZhejiang University

Metal–organic frameworks(MOFs) packed in the column have been a promising candidate as the stationary phase for high performance liquid chromatography(HPLC). However, the direct packing of irregular MOF powder could raise some problems like high back pressure and low column efficiency in the HPLC separation. In this work, UiO-66 capable of separating xylenes was supported effectively on the surface of the monodisperse spherical silica microspheres by one-pot method. The hybridization of Ui O-66 and silica microspheres(termed UiO-66@SiO2 shell–core composite) was prepared by stirring the suspension of the precursors of Ui O-66 and\\COOH terminated silica in the N,N-dimethylformamide with heating. The shell–core composite material UiO66@SiO2 was characterized by SEM, TEM, PXRD and FTIR. Then, it was used as a packing material for the chromatographic separation of xylene isomers. Xylene isomers including o-xylene, m-xylene and p-xylene were efficiently separated on the column with high resolution and good reproducibility. Moreover, the Ui O-66@SiO2 shell–core composites packed column still remained reverse shape selectivity as Ui O-66 possessed, and the retention of xylenes was probably ascribed to the hydrophobic effect between analytes and the aromatic rings of the Ui O-66 shell. The Ui O-66@SiO2 shell–core composites obtained in this study have some potential for the separation of structural isomers in HPLC.

关键词： Adsorption Chromatography Separation Hybridization Metal–organic framework Silica

Characteristics of Electrode-Water-Electrode Discharge and its Application to Water Treatment

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Plasma Science and Technology 2014年第5期16卷 479-485页

作者：王小平李中坚张兴旺雷乐成 Key Laboratory of Biomass Chemical engineering of Ministry of Education Department of Chemical and Biological EngineeringZhejiang University

Atmospheric air discharge above the surface of water is an effective method for water *** leakage current and Joule heating of water are reduced by the air gap,which raises the energy efficiency of the water ***,the application of this kind of discharge is limited by a pair of conflicting factors：the chemical efficiency grows as the discharge gap distance decreases,while the spark breakdown voltage decreases as the gap distance *** raise the spark breakdown voltage and the chemical efficiency of atmospheric pressure water surface discharge,both the high-voltage electrode and the ground electrode are suspended above the water surface to form an electrode-water-electrode discharge *** this system,there are two potential discharge directions：from one electrode to another directly,and from the electrodes to the water *** first step in utilizing the electrode-water-electrode discharge is to find out the discharge direction transition *** this paper,the discharge direction transition criterions of spark discharge and streamer discharge are *** comparing the discharge characteristics and the chemical efficiencies,the discharge propagating from the electrodes to the water surface is proved to be more suitable for water treatment than that propagating directly between the electrodes.

关键词： water treatment electrode-water-electrode discharge discharge direction discharge intensity chemical efficiency

High performance n^+p-Si/Ti/NiS_xO_y photocathode for photoelectrochemical hydrogen evolution in alkaline solution

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Journal of Energy Chemistry 2019年第3期28卷 101-107页

作者： Qing Jia Chunlin Yu Wei Liu Guokui Zheng Chaojun Lei Lecheng Lei Xingwang Zhang Key Laboratory of Biomass Chemical engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University

Silicon, as a promising semiconductor for fabricating photocathode toward photoelectrochemical hydrogen evolution reaction(PEC-HER), should be improved in light harvesting ability and catalytic kinetics to obtain high PEC performance. Herein, a novel amorphous Nickel Oxysulfide(NiS_xO_y) film is effectively integrated with a Ti protected n^+p-Si micropyramid photocathode by the electrodeposition method. The fabricated n^+p-Si/Ti/Ni SxOyphotocathode exhibits excellent PEC-HER performance with an onset potential of 0.5 V(at J =-0.1 mA/cm^2), a photocurrent density of-26 mA/cm^2 at 0 V vs. RHE, and long term stability of six hours in alkaline solution(pH ≈ 14). The synergy of unique n^+p-Si micropyramid architectures(omnidirectional broadband light harvesting ability), novel amorphous NiS_xO_y catalyst(high HER electrocatalytic activity and good optical transparency) results in the high performance of n^+pSi/Ti/Ni S_xO_y. This work offers a novel strategy for effectively integrating electrocatalysts with semiconductor to design efficient photoelectrode toward PEC water splitting.

关键词： Photoelectrochemical water splitting Silicon Photocathode Nickel oxysulfide

Uptake and translocation of sulfamethazine by alfalfa grown under hydroponic conditions

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Journal of Environmental Sciences 2017年第3期29卷 217-223页

作者： Sudarshan Kurwadkar Garrett Struckhoff Kameron Pugh Om Singh Department of Civil and Environmental engineering California State UniversityFullertonCA 92831USA IDS engineering Group HoustonTX 77040USA division of biological and Health Sciences University of PittsburghBradfordPA 16701USA

Antibiotics are routinely used in intensive animal agriculture operations collectively known as Concentrated Animal Feed Operations （CAFO） which include dairy, poultry and swine farms. Wastewater generated by CAFOs often contains low levels of antibiotics and is typically managed in an anaerobic lagoon. The objective of this research is to investigate the uptake and fate of aqueous sulfamethazine （SMN） antibiotic by alfalfa （Medicago satiua） grass grown under hydroponic conditions. Uptake studies were conducted using hydroponically grown alfalfa in a commercially available nutrient solution supplemented with 10 mg/L of SMN antibiotic. Analysis of alfalfa sap, root zone, middle one-third, and top portion of the foliage showed varying uptake rate and translocation of SMN. The highest average amount of SMN （8.58 μg/kg） was detected in the root zone, followed by the top portion （1.89μg/kg）, middle one-third （1.30 μg/kg）, and sap （0.38 μg/kg） samples, indicating a clear distribution of SMN within the sampled regions. The ultraviolet （UV） spectra of parent SMN and translocated SMN identified in different parts of the plant present the possibility of metabolization during the uptake process. Uptake of SMN using alfalfa grown under hydroponic conditions has potential as a promising remediation technology for removal of similar antibiotics from wastewater lagoons.

关键词： AlfalfaHydroponic cultureAntibioticsSulfamethazineConcentrated Animal Feed OperationsPhytoremediation

An efficient approach for the treatment of radioactive waste perfluoropolyether lubricants via a synergistic effect of thermal catalysis and immobilization

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Journal of Environmental Sciences 2024年第2期136卷 512-522页

作者： Xinhang Du Wenhua Tong Xinyu Zhou Jia Luo Yuqiu Liu Yabo Wang Panyu Li Yongkui Zhang Department of Pharmaceutical&biological engineering School of Chemical EngineeringSichuan UniversityChengdu 610065China

Perfluoropolyether(PFPE)lubricants are a kind of high-molecular polymer with many excellent ***,the use of PFPEs in the nuclear industry can lead to partial decomposition and carrying radionuclides,resulting in a large amount of radioactive waste PFPE lubricants ***,radioactive waste PFPE lubricants are difficult to be effectively treated due to their high stability,the risk of possible leakage of radionuclides,and hypertoxic fluorine-containing *** this study,without any precedent,a strategy of Mn O_(2)-catalyzed decomposition and Na_(2)CO_(3)-immobilized conversion was proposed for PFPE lubricant decomposition and fluorine immobilization simultaneously based on the Lewis acid-base and oxygen vacancies concept.A high fluorine conversion efficiency of 95.4%was ***,the mechanism of decomposition suggested that Mn O_(2)mainly provided Lewis acid sites and attacked the(basic)fluorine or oxygen atoms in PFPE *** decomposition of PFPE chains was proceed down and volatile fluorine-containing gas was released by partial electron transfer,intramolecular disproportionation reaction,and unzipping ***,gas by-products could be further oxidized and then immobilized into fluoride salts by carbonate solid ***,this study provides a simple,safe,and potentially practical strategy for the harmless conversion of refractory fluorinated organic wastes,especially perfluoropolymers.

关键词： Perfluoropolyether lubricants Catalyzed decomposition Fluorine-containing gas Immobilized conversion Fluoride

Effects of Chirality on Gene Delivery Efficiency of Polylysine

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Chinese Journal of Polymer Science 2016年第1期34卷 94-103页

作者： Bin-wei Zhao Zhuxian Zhou 申有青 Center for Bionanoengineering and State Key Laboratory for Chemical engineering Department of Chemical and Biological Engineering Zhejiang University

Chirality is a key factor in the biological activity of many biomolecules. Poly（L-lysine）（PLL）, a polypeptide synthesized from L-lysine, is one of the mostly used cationic polymers for gene delivery. The effect of chirality of polylysine（PL） on its gene delivery remains unknown. Herein, we prepared three polylysines（PLs） with the similar molecular weight but different backbone chiralities including poly（L-lysine）（PLL）, poly（D-lysine）（PDL） and poly（DL-lysine）（PDLL）. The side chains of each PL were modified with propylene oxide（PO） of different chiralities including（R）PO,（S）PO and（R,S）PO. These PL-POs with distinct chirality in main and side chains could condense p DNA into polyplexes. The polyplexes had approximately the same size, zeta potential and binding ability, but showed distinct gene transfection efficiency. We found that the PLs of L-configuration in the main chain had higher transfection efficiency than that of D or DL configuration due to their faster cellular uptake, while the side chain chirality had no effect on transfection efficiency.

关键词： Gene delivery Gene transfection Chiral effects Polylysine