检索结果-南通市图书馆

Microfluidic chip of concentration gradient and fluid shear stress on a single cell level

在线全文

学校读者我要写书评

暂无评论

Chinese chemical Letters 2022年第6期33卷 3133-3138页

作者： Xuexia Lin Jianlong Su Shufeng Zhou department of chemical engineering&Pharmaceutical engineering College of Chemical EngineeringHuaqiao UniversityXiamen 361021China

Concentration gradient and fluid shear stress(FSS)for cell microenvironment were investigated through microfluidic technology.The Darcy–Weisbach equation combined with computational fluid dynamics modeling was exploited to design the microfluidic chip,and the FSS distribution on the cell model with varying micro-channels(triangular,conical,and elliptical).The diffusion with the incompressible laminar flow model by solving the time-dependent diffusion–convection equation was applied to simulate the gradient profiles of concentration in the micro-channels.For the study of single cell in-depth,the FSS was investigated by the usage of polystyrene particles and the concentration diffusion distribution was studied by the usage of different colors of dyes.A successful agreement between model simulations and experimental data was obtained.Finally,based on the established method,the communication between individual cells was envisaged and modeled.The developed method provides valuable insights and allows to continuously improve the design of microfluidic devices for the study of single cell,the occurrence and development of tumors,and therapeutic applications.

关键词： Concentration gradient Fluid shear stress Single particle Computational fluid dynamics Microfluidic chip

3D multiphase flow simulation of Marangoni convection on reactive absorption of CO_(2) by monoethanolamine in microchannel

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemical engineering 2022年第3期35卷 370-377页

作者： Shuai Chen Jiahong Lan Yu Zhang Jia Guo Zhikai Cao Yong Sha department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

A multiphase flow 3D numerical simulation method employing the coupled volume of fluid(VOF)and level set model is established to study the reactive absorption of CO_(2)by the monoethanolamine(MEA)aqueous solution in a falling film microchannel.Based on the flow-reaction-mass transfer model of the MEA-CO_(2)system in the falling film microchannel,the enhancement effect of the Marangoni convection in this reactive absorption process is analyzed.The enhancement factor of the Marangoni convection obtained in this work is in good agreement with experimental results in the literature.With consideration of the absorption ratio as well as the enhancement effect of the Marangoni convection,the influence of different MEA concentrations on absorption of CO_(2)is investigated.Furthermore,the appropriate MEA concentration for absorption enhanced by the Marangoni convection is acquired.

关键词： Numerical simulation Microchannel Falling film Marangoni convection MEA-CO_(2)

Supported catalytic packing prepared from ceramic packing for reactive distillation of ethyl acetate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemical engineering 2022年第10期50卷 205-214页

作者： Zhiwei Wang Jiannan Shi Xiaonan Liu Zhikai Cao Yong Sha department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

In this work,a strategy of"etching-modification filling-graft copolymerization"was proposed to load the acidic ionic polyionic liquid on the smooth ceramic surface.In this way,commercial ceramic Raschig rings were successfully transformed into the supported catalytic packing for the reactive distillation,and were further evaluated with esterification reaction of ethyl acetate by means of the fully mixed reactor,the ultrasonic destruction,the cyclic catalysis reaction and the lab-scale distillation column experiment.This catalyst coating has good adhesion with the substrate.It can withstand 24 h of ultrasound damage and shows good stability in three cycle catalytic experiments.This kind of coated catalyst has better catalytic activity than the commercial Amberlyst 15 dry.In the lab-scale reaction distillation,the supported catalyst Raschig ring can achieve a higher conversion in comparison with the tea bag catalytic packing of Amberlyst 15 dry under some conditions.

关键词： Supported catalyticpacking Ethyl acetate Reactive distillation Bonding strength

Insights on Carbon Neutrality by Photocatalytic Conversion of Small Molecules into Value-Added chemicals or Fuels

在线全文

学校读者我要写书评

暂无评论

Accounts of Materials Research 2022年第12期3卷 1206-1219页

作者： Haimiao Jiao Chao Wang Lunqiao Xiong Junwang Tang department of chemical engineering University College London

CONSPECTUS:Photocatalytic conversion of small molecules(including H_(2)O,CO_(2),N_(2),CH4,and benzene)into value-added chemicals or fuels(e.g.,H_(2),NH_(3),C_(2)+,etc.)is a promising strategy to cope with both the worldwide increasing energy demand and greenhouse gas emission in both energy sectors and chemical industry,thus paving an effective way to carbon neutrality.On the other hand,compared with conventionally thermo-or electrocatalytic processes,photoactivation can convert these very stable small molecules by the unexhausted solar energy,so leading to store solar energy in chemical bonds.Thus,it can effectively reduce the reliance on the nonrenewable fossil fuels and avoid the substantial emission of hazardous gases such as CO_(2),NOx,and so on while producing valued-added chemicals.For example,semiconductors can absorb solar light to split H_(2)O into H2 and O2 or convert CO_(2)to alcohols,which can then be used as zero or neutral carbon energy sources.

关键词： neutral convert bonds

Insight into the dynamic adsorption behavior of graphene oxide multichannel architecture toward contaminants

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of chemical engineering 2023年第1期53卷 124-132页

作者： Jian Tian Gen Li Wang He Kok Bing Tan Daohua Sun Junfu Wei Qingbiao Li department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China college of Chemistry and chemical engineering Tiangong UniversityTianjin 300387China college of Food and Biological engineering Jimei UniversityXiamen 361021China

Graphene oxide(GO) channels exhibit unique mass transport behaviors due to their flexibility, controllable thinness and extraordinary physicochemical properties, enabling them to be widely used for adsorption and membrane separation. Nevertheless, the adsorption behavior of nanosized contaminants within the channels of GO membrane has not been fully discussed. In this study, we fabricated a GO membrane(PGn, where n represents the deposition cycles of GO) with multi channels via the crosslinking of GO and multibranched poly(ethyleneimine)(PEI). Phenol was used as molecular probe to determine the correlations between dynamic adsorption behavior and structural parameters of the multilevel GO/PEI membrane. PG8 shows higher adsorption capacities and affinity, which is predominantly attributed to the multichannel structure providing a large specific surface for phenol adsorption, enhancing the accessibility of active sites for phenol molecules and the transport of phenol. Density functional theory calculations demonstrate that the adsorption mechanism of phenol within GO channel is energetically oriented by hydrogen bonds, which is dominated by oxygen-containing groups compared to amino groups. Particularly, the interfaces which facilitate strong π-π interaction and hydrogen bonds maybe the most active regions. Moreover, the as-prepared PG8 membrane showed outstanding performance for other contaminants such as methyl orange and Cr(VI). It is anticipated that this study will have implications for design of GO-related environmental materials with enhanced efficiency.

关键词： Graphene oxide Multichannel Adsorptive behavior Phenol DFT calculations

Preparation of novel magnetic nanoparticles as draw solutes in forward osmosis desalination

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemical engineering 2022年第6期35卷 223-230页

作者： Dongze Ma Ye Tian Tiefei He Xiaobiao Zhu department of Environmental Science and engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Novel magnetic nanoparticles(MNPs),Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2),were prepared by loading different amounts of SiO_(2) or/and PEG-(COOH)_(2) onto Fe_(3)O_(4) nanoparticles,and their feasibility to be used as forward osmosis(FO)draw solutes was investigated.The characterization of the materials showed that,compared to normal Fe_(3)O_(4) nanoparticles,the modified MNPs exhibited enhanced dispersity and high osmotic pressure in aqueous solution.The FO experiment indicated that the synthesized draw solutes could obtain a water flux as high as 10 L·m^(-2)·h^(-1) with an aquaporin FO membrane.The optimal concentration of the added tetraethyl orthosilicate was 30%during the synthesis.The novel MNPs could be easily recovered from draw solutions by magnetic field,and the recovery rate of Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) was 83.95%and 63.37%,respectively.Moreover,after 5 recycles of reuse,the water flux of Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) as draw solutes still remained 64.36%and 85.26%,respectively.The experimental results demonstrated that the synthesized core–shell magnetic nanoparticles are promising draw solutes,and the Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) was more suitable to be used as draw solute in FO process.

关键词： Magnetic nanoparticles Forward osmosis Draw solute Fe_(3)O_(4) PEG-(COOH)_(2)

Hierarchical monolithic carbon with high transfer performance for hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第10期31卷 41-48,I0002页

作者： Yazhang Lin Weijie Zhu Yunhua Li department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina

Electrocatalysis is an efficient green process for energy conversion.However,for gas-related electrocatalytic reaction,sluggish gas transport has inhibited significantly the promotion of electrocatalytic performances.Herein,hierarchical monolithic material 3 DPC-650 and 3 DPC-650@Ni/Ni(OH)_(2) were prepared by3 D printing polyethyleneimine cross-linking oxygenated carbon nanotube and following nickel electrodeposition.3 DPC-650 and 3 DPC-650@Ni/Ni(OH)_(2) have regular pore structure in consistence with3 D printing design and uniform dispersed elements.Amide bonds and carbon defects are presented on the surface of 3 DPC-650 and 3 DPC-650@Ni/Ni(OH)_(2) as well as uniformly distributed β-Ni(OH)_(2) on3 DPC-650@Ni/Ni(OH)_(2).3 DPC-650 and 3 DPC-650@Ni/Ni(OH)_(2) present lower overpotentials of 322 and160 mV for hydrogen evolution reaction in 1.0 M KOH at 50 mA cm^(-2),respectively.The ordered channel,high turnover frequency and electrochemically active surface area,hydrophilic and aerophobic properties result in the higher performance of 3 DPC-650 and 3 DPC-650@Ni/Ni(OH)_(2) than traditional supports(carbon paper,carbon cloth,and nickel foam) and electrocatalysts.This work provides an efficient pathway for design and preparation of the monolithic electrocatalyst and electrode used for electrochemical reactions where gas is involved.

关键词： 3D printing Hierarchical structure Monolith Mass transfer Charge transfer Hydrogen evolution reaction

Effects of ancillary ligands in acceptorless benzyl alcohol dehydrogenation mediated by phosphine-free cobalt complexes

在线全文

学校读者我要写书评

暂无评论

Frontiers of chemical Science and engineering 2023年第3期17卷 314-325页

作者： Yan Xu Lu Wang Junwei Wu Guanzhong Zhai Daohua Sun department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China department of chemical and Biochemical engineering National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−EstersCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Luoyang Ship Material Institute Luoyang 471039China

Acceptorless alcohol dehydrogenation stands out as one of the most promising strategies in hydrogen storage technologies.Among various catalytic systems for this reaction,cost-effective molecular catalysts using phosphine-free ligands have gained considerable attention.However,the central challenge for using non-precious metals is to overcome the propensity of reacting by oneelectron pathway.Herein,we synthesized a phosphine-freeη^(5)-C_(5)Me_(5)-Co complex by using the metal-ligand cooperative strategy and compared its activity with analogous catalysts toward acceptorless alcohol dehydrogenation.The catalyst showed excellent performance with a turnover number of 130.4 and a selectivity close to 100%.The improved performance among the class ofη^(5)-C_(5)Me_(5)-Co complexes could be attributed to the more accessible Co center and its cooperation with the redox-active ligand.To further study the systematic structure-activity relationship,we investigated the electronic structures ofη^(5)-C_(5)Me_(5)-Co complexes by a set of characterizations.The results showed that the redox-active ligand has a significant influence on theη^(5)-C_(5)Me_(5)-Co moiety.In the meantime,the proximal O−/OH group is beneficial for shuttling protons.For the catalytic cycle,two dehydrogenation scenarios were interrogated through density functional theory,and the result suggested that the outer-sphere pathway was preferred.The formation of a dihydrogen complex was the rate-determining step with aΔG value of 16.9 kcal∙mol‒1.The electron population demonstrated that theη^(5)-C_(5)Me_(5)ligand played a key role in stabilizing transition states during dehydrogenation steps.This work identified the roles of vital ligand components to boost catalytic performance and offered rationales for designing metal-ligand cooperative nonprecious metal complexes.

关键词： acceptorless alcohol dehydrogenation η^(5)-C_(5)Me_(5)-Co metal-ligand cooperation theoretical calculation

Component analysis and risk assessment of biogas slurry from biogas plants

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of chemical engineering 2022年第4期35卷 182-191页

作者： Lanting Ke Xiaobin Liu Bingqing Du Yuanpeng Wang Yanmei Zheng Qingbiao Li department of chemical and Biochemical engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China college of Food and Biology engineering Jimei UniversityXiamen 361021China

Massive amounts of biogas slurry are produced due to the development of biogas plants.The pollution features and the risk of biogas slurry were fully evaluated in this work.Thirty-one biogas slurry samples were collected from sixteen different cities and five different raw materials biogas plants(e.***.cattle manure,swine manure,straw-manure mixture,kitchen waste and chicken manure).The chemical oxygen demand(COD),ammonia nitrogen(NH_(4)^(+)-N),anions(e.g.Cl^(-1),SO_(4)^(2-),NO_(3)^(-)and PO_(4)^(3-)),antibiotics(e.***.sulphonamides,quinolones,β2-receptor agonists,macrolides,tetracyclines and crystal violet)and heavy metals(e.g.Cu,Cd,As,Cr,Hg,Zn and Pb)contents from these biogas slurry samples were systematically investigated.On this basis,risk assessment of biogas slurry was also performed.The concentrations of COD,NH_(4)^(+)-N and PO_(4)^(3-) in biogas slurry samples with chicken manure as raw material were significantly higher than those of other raw materials.Therefore,the biogas slurry from chicken manure raw material demonstrated the most serious eutrophication threat.The antibiotic contents in biogas slurry samples from swine manure were the highest among five raw materials,mostly sulphonamides,quinolones and tetracyclines.Biogas slurry revealed particularly serious arsenic contamination and moderate potential ecological risk.The quadratic polynomial stepwise regression model can quantitatively describe the correlation among NH_(4)^(+)-N,PO_(4)^(3+) and heavy metals concentration of biogas slurry.This work demonstrated a universal potential threat from biogas slurry that can provide supporting data and theoretical basis for harmless treatment and reuse of biogas slurry.

关键词： Biogas slurry Antibiotics Heavy metals Risk assessment