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Novel method for separation and screening of lubricant-degrading microorganisms and bacterial biodegradation

Chinese Journal of Chemical Engineering 2016年第3期24卷 353-359页

作者： Yan Jiang Hui Qi xianming zhang Engineering Research Centre for Waste Oil Recovery Technology and Equipment Ministry EducationChongqing Technology and Business University College of Foreign Languages Chongqing Technology and Business University

With the rapid increase of lubricant consumption, oil contamination becomes more serious. Biotreatment is an important method to remove oil contamination with some advantages. In this study, acclimatized oil- contaminated soil and used lubricating oil were sampled to isolate lubricant-degrading strains by several methods. 51 isolates were obtained and 24-well plates were employed to assess bacterial potential in high- throughput screening. The method was noted for the prominence of oil-water two-phase system with saving chemicals, shortening cycles and lessening workloads. In order to decrease inaccuracy, subculture and resting cells were inoculated into mineral salt medium with 200 μ1 oil in well plates for the cultivation at 37 ℃ for 5 and 7 days, and the biodegradation potential was characterized by the changes of oil film and cell density. With appropriate evaluation by shaking flask tests, 5 isolates were retained for their potentials with the maxi- mum biodegradation from 1500 to 2200 mg· L-1 and identified as Acidovorax dtrulli, Pseudomonos balearica, Adnetobacterjohnsonii （two isolates with different biodegradation potentials） and Addovorax avenae using 16S rRNA sequencing analysis. Also, lipase activity was determined using indicator titration and p-nitrophenyl palmitate （p-NPP） methods. The results indicated that only p-NPP was successful to test lipase activity with the range of 1.93-6.29 mg· L-1 Although these five strains could degrade 1000 mg· L-1 lubricating oil in 158-168 h, there existed distinct difference in enzyme activity, which demonstrates that lipase activity could not be used as the criterion to evaluate microbial biodegradation potential for petroleum hydrocarbons.

关键词： Lubricant Degradation Separation 24-well plate Enzyme

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Residence time distribution of high viscosity fluids falling film flow down outside of industrial-scale vertical wavy wall: Experimental investigation and CFD prediction

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1586-1594页

作者： Shichang Chen Lihao zhang Yongjun Wang xianming zhang Wenxing Chen National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang) Zhejiang Sci-Tech University

The flow behavior of gravity-driven falling film of non-conductive high viscosity polymer fluids on an industrial-scale vertical wavy wall was investigated in terms of film thickness and residence time distribution by numerical simulation and *** film flow of high viscosity fluids was found to be steady on a vertical wavy wall in the presence of the large film *** comparison between numerical simulation and experiment for the film thickness both in crest and trough of wavy wall showed good *** simulation results of average residence time of falling film flow with different viscous fluids were also consistent with the experimental *** work provides the initial insights of how to evaluate and optimize the falling film flow system of polymer fluid.

关键词： Falling film flow High viscosity polymer fluid Residence time distribution Film thickness Numerical simulation

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Experimental results for the vapor-liquid equilibria of 0(formaldehyde+1,3,5-trioxane+methanol+salt+water)systems and comparison with predictions

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Chinese Journal of Chemical Engineering 2021年第4期34卷 291-300页

作者： xianming zhang Mengchen Li Yufeng Hu Zhichang Liu Shuqin Mo State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior&Property Research Laboratory China University of PetroleumBeijing 102249China School of Chemical Engineering Ordos Institute of TechnologyOrdos 017000China PetroChina Petrochemical Research Institute Science Base PetroChina Beijing 102206China

The salt effect on the vaporliquid phase equilibrium(VLE)of solvent mixtures is of significant interest in the industrial production of 1,3,*** data for the VLE of quinary systems(formaldehyde+1,3,5trioxane+methanol+salt+water)and their ternary subsystems(formaldehyde+salt+water),(1,3,5trioxane+salt+water),and(methanol+salt+water)were systematic measured under atmospheric *** salts considered included KBr,NaNO_(3),and CaCl_(2).The extended UNIFAC model was used to describe the VLE of the saltcontaining reactive *** model parameters were determined from the experimental VLE data of ternary systems or obtained from the literature,and then were used to predict the VLE of systems(1,3,5trioxane+KBr+water),(methanol+KBr+water),(formaldehyde+KBr+water),and(formaldehyde+1,3,5trioxane+methanol+salt+water)with salt=KBr,NaNO_(3),and CaCl_(2).The predicted results showed good agreements with the measured ***,the model was used to uncover the salt effect on the VLE of these multisolvent reactive systems.

关键词： Vapor liquid equilibria Reactive distillation Activity coefficient 1,3,5-Trioxane production UNIFAC Salt effect

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A Novel Networked Predictive Control Method for Systems with Random Communication Constraints

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Journal of Systems Science & Complexity 2021年第4期34卷 1364-1378页

作者： PANG Zhonghua BAI Chuandong LIU Guoping HAN Qinglong zhang xianming Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of TechnologyBeijing 100144China Department of Artificial Intelligence and Automation Wuhan UniversityWuhan 430072China School of Software and Electrical Engineering Swinburne University of TechnologyMelbourneVIC 3122Australia

This paper presents a novel observer-based predictive control method for networked systems where random network-induced delays,packet disorders and packet dropouts in both feedback and forward channels are *** proposed method has three significant features:i)A concept of destination-based lumped(DBL)delay is introduced to represent the combined effects of random communication constraints in each channel;ii)in view of different natures of the random DBL delays in the feedback and forward channels,different compensation schemes are designed;and iii)it is actual control inputs rather than predicted ones that are employed to generate future control signals based on the latest system state estimate available in the *** the resulting closed-loop system,a necessary and sufficient stability condition is derived,which is less conservative and also independent of random communication constraints in both *** results are provided to demonstrate the effectiveness of the proposed method.

关键词： Networked control systems(NCSs) network-induced delay networked predictive control packet disorder packet dropout

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Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

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Chinese Journal of Chemical Engineering 2022年第6期35卷 214-222页

作者： Yaran Yin xianming zhang Chunying Zhu Taotao Fu Youguang Ma National Engineering Laboratory for Textile Fiber Materials and Processing Technology(Zhejiang) School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

This study focuses on the effect of chemical absorption on the formation dynamic characteristics and initial length of Taylor *** temporal evolutions of neck width and length of gaseous thread and initial length with and without chemical absorption were investigated with the Capillary number and Hatta number between 0.0010–0.0073 and 1.8–5.8 *** squeezing regime with typical three stages,expansion,squeezing and pinch off is observed for both two *** with the nonabsorption process,the increase of formation time in the chemical absorption process arises mainly from the expansion stage,and the decrease of initial length is from the necking *** addition,the temporal length evolution satisfies the power-law scale with the same exponent but a smaller pre-exponential *** correlations of neck width for stage transition and initial length with Hatta number demonstrate the enhancement effect of chemical absorption on bubble formation dynamics and initial length at relatively high chemical reaction rates and long formation *** study provides insight into the bubble formation mechanism and helps to regulate the bubble initial size with chemical absorption.

关键词： Microchannels Absorption Bubble Formation dynamics

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Tunable Nonlinear Optical Property and Photocatalytic Activity on Luminescent Chiral Lanthanide Chains

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Chinese Journal of Chemistry 2014年第12期32卷 1259-1266页

作者： Mei Qu Minmin Liu Jiang Liu xianming zhang School of Chemistry&Material Science Shanxi Normal UniversityLinfenShanxi 041004China

Five chiral(P2_(1))isostructural lanthanide coordination complexes Ln(pic)_(3)[pic=picolinic acid,Ln=La(1),Gd(2),Nd(3),Sm(4)and Eu(5)]have been hydrothermally generated,featuring one dimensional right-handed 2_(1)helical chains constructed from LnN_(3)O_(6)of square antiprism geometry and N,O-chelated pic−groups,in which 3,4 and 5 have been reported,but we explore undiscovered properties of their own *** special,1 undergoes an abnormal transformation of symmetry as the temperature cooling to 100 ***-DSC studies demonstrated that all isologues have good thermal stability with the decomposition temperature up to 400℃.Then,UV-Vis-NIR transmission spectroscopy measurements indicated that they possess a short-wavelength absorption edge onset at 377 nm,corresponding to the optical band gap of 3.29 ***,powder second harmonic generation(SHG)measurements revealed that the SHG intensity of 1,2,4 and 5 may be about 1.2,2.0,0.9 and 0.75 times that of KH_(2)PO_(4),***,1 and 3 exhibit efficient photocatalytic degradation for MB(Methylene Blue)upon UV-light ***,both 1 and 2 show strong blue luminescence.

关键词： lanthanides nonlinear optics degradation luminescence

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C2-phenyl-substituted benzimidazolium-based covalent organic framework as efficient catalyst for CO_(2) conversion without solvents,metals,and cocatalysts

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Science China Chemistry 2024年第2期67卷 551-557页

作者： Zhenzhen Wu Jing Wang Lili Liu Shang Guo Juan Li xianming zhang Shanxi Institute for Functional Food Shanxi Agricultural UniversityTaiyuan030031China Institute of Crystalline Materials Shanxi UniversityTaiyuan030006China Key Laboratory of Interface Science and Engineering in Advanced Materials College of ChemistryTaiyuan University of TechnologyTaiyuan030024China

Covalent organic frameworks(COFs) are a potential platform for carbon dioxide(CO_(2)) conversion owing to their periodic permanent porosity,adjustable structure,and chemical *** good catalytic performance in CO_(2) conversion,collaborative multifunctions should be strategically integrated into the catalytic system design and *** this study,a four-in-one high-efficiency catalyst was synthesized and tested for CO_(2) cycloaddition to form cyclic *** obtained Tp-MPB-BrCOF had a high nitrogen content,which enhanced its CO_(2) affinity through substantial Lewis acid-base or dipole-quadrupole interactions;moreover,the acid(protons transferring from oxygen(–OH) to nitrogen(–NH)),hydrogen bond donor(hydroxyl group),and Br-(nucleophile group) served as three active sites,further improving the catalyst *** results provide a basis for designing efficient and stable CO_(2)-conversion catalysts.

关键词： covalent organic framework C2-phenyl-substituted benzimidazolium CO_(2)conversion four-in-one catalyst

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Mg-Fe LDH sealed PEO coating on magnesium for biodegradation control,antibacteria and osteogenesis

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Journal of Materials Science & Technology 2022年第10期105卷 57-67页

作者： Dongdong zhang Jielong Zhou Feng Peng Ji Tan xianming zhang Shi Qian Yuqin Qiao Yu zhang Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510080China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou 310024China Cixi Center of Biomaterials Surface Engineering Shanghai Institute of CeramicsChinese Academy of SciencesNingbo 315300China

Attempt of developing bio-safety and functional layered double hydroxides(LDHs)modifed plasma electrolytic oxidation(PEO)coatings,has become a hotspot in the protection of magnesium(Mg)based biomedical *** the present work,Mg-Fe LDH flms with different Fe contents were fabricated on PEO coating via a novel two-step method:frstly,the Fe OOH flms were prepared by immersing PEO sample in Fe^(2+)-containing solution,and then Mg-Fe LDH flms were formed by transforming the Fe OOH flms via a hydrothermal treatment in *** highly-oriented LDH nano-sheets could enhance the anti-corrosion performance of PEO coating,which was proved by the results of electrochemical test,hydrogen evolution and corroded ***/Mg-Fe LDH coatings showed a low hemolysis rate(less5%)than PEO *** addition,PEO/Mg-Fe LDH coatings were more favorable for cell adhesion and proliferation than PEO ***,PEO/Mg-Fe LDH coatings showed good photothermal conversion property,which demonstrated the excellent rapid antibacterial effect under NIR *** vitro culture of rat bone marrow stem cell(r BMSC)suggested that cells cultured in the extract of PEO/Mg-Fe LDH coatings had a better osteogenic *** vivo subcutaneous implantation test revealed that PEO/Mg-Fe LDH coatings exhibited good anti-corrosion and histocompatibility.

关键词： Magnesium Plasma electrolytic oxidation Layered double hydroxide Anti-corrosion Anti-bacteria Osteogenesis

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Demulsification Behavior, Characteristics, and Performance of Surfactant Stabilized Oil-in-Water Emulsion under Bidirectional Pulsed Electric Field

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 10-22页

作者： Ren Boping Kang Yong zhang xianming Gong Haifeng Chen Ling Liu Yunqi Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580China

As a novel electric demulsification method,bidirectional pulsed electric field(BPEF)was employed to demulsify the surfactant stabilized oil-in-water(SSO/W)emulsion for oil/water separation in this *** demulsification behavior,characteristics,and stages under BPEF were *** was discovered that BPEF drove SSO/W emulsion to move and form vortexes,during which the oil droplets aggregated and accumulated to generate an oil droplet layer(ODL).ODL subsequently transformed into a continuous oil layer(COL)leading to the demulsification and separation of SSO/W *** conversion rate of ODL to COL was defined and used to evaluate the demulsification process and reflect the coalescence ability and transformation efficiency of dispersed oil droplets into ***,the effects of BPEF voltage,frequency,duty cycle,ratio of pulse output time,and surfactant type and content on the demulsification performance were *** optimal values of BPEF parameters for demulsification operation were 400 V,25 Hz,50%,and 4:1.O/W emulsion containing anionic surfactant was apt to be demulsified by BPEF,nonionic surfactant took the second place and cationic surfactant was the most difficult.A high surfactant content was not conducive to the BPEF *** work is anticipated to provide useful guidance for oil/water separation and oil recovery from actual emulsified oily wastewater by BPEF.

关键词： oil-in-water emulsion surfactant demulsification bidirectional pulsed electric field

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Concentration of linoleic acid from cottonseed oil by starch complexation

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Chinese Journal of Chemical Engineering 2019年第4期27卷 845-849页

作者： Dan Liang Yufeng Hu Weiting Ma Zhengtang Zhao Siqi Jiang Yichuan Wang xianming zhang State Key Laboratory of Heavy Oil Processing China University of Petroleum

The extraction of linoleic acid from fatty acids(FA) of the cottonseed oil using starch–FA complexes was developed for the first time. We showed that starch can form inclusion complexes of different strengths with FA and that the different strengths stem from the differences in chain length, degree of unsaturation, and position of double bonds of FA. The optimal separation conditions were determined as follows: The inclusion temperature is 69 °C, the inclusion time is 30 min, the starch/FA mass ratio is 10:1, and the ratio of the volume of methanol–water solution and the mass of FA is 18:1. Compared to urea inclusion complexation, starch complexation has milder reaction temperature and shorter reaction time. Under these conditions, linoleic acid can be concentrated from 38.9% to 70.04% by one-off extraction. Moreover, the experimental results demonstrate the almost perfect reusability of starch. These results show that starch complexation is a promising method that can be used to obtain highly concentrated linoleic acid from cottonseed oil.

关键词： Starch Linoleic acid Starch complexation Starch–FA complex Cottonseed oil

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