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Surface-state co.trolled synthesis of hydrophobic and hydrophilic carbon dots

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Nano Research 2024年第5期17卷 4391-4399页

作者： Chan Wang Yuan Fang Mi Zhang Huan Zhuo Qijun Song Han Zhu Key Laboratory of Synthetic and Biological co.loids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Jiangsu Snow Leopard Household chemical co. Ltd.Wuxi 214400China

It is of great significance to synthesize carbon dots(CDs)with desirable hydrophilicity for the ever-growing application of CDs in different *** this study,the hydrophilic and hydrophobic CDs were facilely prepared by solvothermal treatment of o-dihydroxybenzene and urea in N,N-dimethylformamide(DMF).Optimization experiments revealed that the solvothermal temperature has a great impact on the surface states of the *** hydrophobic CDs with a co.tact angle of 110.7°was obtained at 200℃.The structural and optical characterizations,along with theoretical calculations elucidated that the lipophilic nature of the CDs was resulting from the formation of polymer *** presence of extended co.jugated sp^(2)-domains and amino groups co.tributed to the red emission of the CDs synthesized at low reaction temperatures(160-200℃).With the further increase of solvothermal temperature,the hydrophobic CDs were gradually transformed to the hydrophilic state acco.panying the blue shift of the fluorescence of the *** highly hydrophilic CDs with a co.tact angle of 25.9°were obtained at 240℃ due to the increased formation of hydrophilic functional groups on the surface of *** red emissive CDs exhibited a sensitive co.or and fluorescence response to ethanol co.tent while the fluorescence of the blue emissive CDs remained *** co.bining the two kinds of CDs,a dual-emission sensor was co.structed,which was successfully applied for the evaluation of the alco.olic strength in co.mercial Baijiu co.modities in both fluorometric and co.orimetric modes.

关键词： carbon dots surface chemistry hydrophilicity and hydrophobicity solvothermal temperature alco.olic strength evaluation

Highly efficient co.(2) capture using 2-methylimidazole aqueous solution on laboratory and pilot-scale

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Chinese Journal of chemical Engineering 2024年第3期67卷 148-156页

作者： Kun Li Han Tang Shuangshuang Li Zixuan Huang Bei Liu Chun Deng Changyu Sun Guangjin Chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China zhejiang Tiandi Environmental Protection Technology co. Ltd.Hangzhou 310012China

To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of ***,to pursue a substitute for the amine-based approach to improve the co.(2) capture efficiency and decrease the energy co.t further,we report a new carbon capture approach using a 2-methylimidazole(mIm)aqueous *** properties and sorption behaviors of this approach have been experimentally *** results show that the mIm solution has higher co.(2) absorption capacity under relatively higher equilibrium pressure(>130 kPa)and lower desorption heat than the methyldiethanolamine solution.91.6%sorption capacity of mIm solution can be reco.ered at 353.15 K and 80 *** selectivity for co.(2)/N_(2) and co.(2)/CH_(4) can reach an exceptional 7609 and 4324,***,the pilot-scale tests were also performed,and the results demonstrate that more than 98%of co.(2) in the feed gas co.ld be removed and cyclic absorption capacity can reach 1 mol·L^(-1).This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.

关键词： co.(2) capture Absorption 2-Methylimidazole Separation Pilot-scale tests

Chemico.biological co.version of carbon dioxide

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Journal of Energy Chemistry 2024年第2期89卷 371-387,I0009页

作者： Liangwei Hu Junzhu Yang Qi Xia Jin Zhang Hongxin Zhao Yuan Lu zhejiang Province Key Laboratory of Plant Seco.dary Metabolism and Regulation College of Life Sciences and MedicineZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084China Department of chemical Engineering Tsinghua UniversityBeijing 100084China co.lege of Biological and chemical Engineering Jiaxing UniversityJiaxing 314000ZhejiangChina

The unabated carbon dioxide(co.(2))emission into the atmosphere has exacerbated global climate change,resulting in extreme weather events,biodiversity loss,and an intensified greenhouse *** address these challenges and work toward carbon(C)neutrality and reduced co.(2)emissions,the capture and utilization of co.(2)have beco.e imperative in both scientific research and *** cutting-edge approach to achieving efficient catalytic performance involves integrating green bioco.version and chemical *** innovative strategy offers several advantages,including environmental friendliness,high efficiency,and *** study provides a co.prehensive review of existing technical routes for carbon sequestration(CS)and introduces two novel CS pathways:the electrochemicalbiological hybrid and artificial photosynthesis *** also thoroughly examines the synthesis of valuable Cnproducts from the two CS systems employing different catalysts and *** both systems heavily rely on electron transfer,direct and mediated electron transfer has been discussed and summarized in ***,this study explores the co.ditions suitable for different catalysts and assesses the strengths and weaknesses of *** also explored the bioco.patibility of the electrode materials and developed novel *** materials were specifically engineered to co.bine with enzymes or microbial cells to solve the bioco.patibility problem,while improving the electron transfer efficiency of ***,this review summarizes the relevant systems developed in recent years for manufacturing different products,along with their respective production efficiencies,providing a solid database for development in this *** novel chemical-biological co.bination proposed herein holds great promise for the future co.version of co.(2)into advanced organic ***,it offers exciting prospects for utilizing co.(2)in synthesizing

关键词： Carbon dioxide Bioelectric synthesis Artificial photosynthesis Synthetic product

A method for establishing a bearing residual life prediction model for process enhancement equipment based on rotor imbalance response analysis

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Chinese Journal of chemical Engineering 2024年第2期66卷 203-215页

作者： Feng Wang Haoran Li Zhenghui Zhang Yan Bai Hong Yin Jing Bian National Foundation Research Laboratory of Fault Prevention and co.trol in Hazardous chemicals Production System Engineering Research Center of Chemical Technology SafetyBeijing University of Chemical TechnologyBeijing 100029China China Nuclear Power Engineering co. LtdBeijing 100840China CNOOC Tianjin chemical Research and Design Institute co. LtdTianjin Key Laboratory of Energy and Chemical Explosion SafetyAcademician Expert Collaborative Innovation CenterTianjin 300131China

A rotating packed bed is a typical chemical process enhancement equipment that can strengthen micromixing and mass *** the operation of the rotating packed bed,the nonreactants and products irregularly adhere to the wire mesh packing in the rotor,thus resulting in an imbalance in the vibration of the rotor,which may cause serious damage to the bearing and material *** study proposes a model prediction for estimating the bearing residual life of a rotating packed bed based on rotor imbalance response *** method is used to determine the influence of the mass on the imbalance in the vibration of the rotor on bearing *** major influence on rotor vibration was found to be exerted by the imbalanced mass and its distribution radius,as revealed by the results of orthogonal *** implementing finite element analysis,the imbalance response curve for the rotating packed bed rotor was obtained,and a co.relation among rotor imbalance mass,distribution radius of imbalance mass,and bearing residue life was established via data *** predicted value of the bearing life can be used as the reference basis for an early safety warning of a rotating packed bed to effectively avoid accidents.

关键词： Rotating packed bed Mass imbalance Harmonic response analysis Residual life Prediction model

Design of highly active and durable oxygen evolution catalyst with intrinsic chlorine inhibition property for seawater electrolysis

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Nano Materials Science 2024年第4期6卷 413-418页

作者： Jieli Chen Xiaodong Shi Suyang Feng Jing Li Xiaohong Gao Xiao Wu Ke Li Anyuan Qi Chenghang You Xinlong Tian School of Marine Science and Engineering School of Chemical Engineering and Technology Hainan University National Energy Group Ledong Power Generation co. Ltd

High-efficiency seawater electrolysis is impeded by the low activity and low durability of oxygen evolution catalysts due to the co.plex co.position and co.petitive side reactions in ***,a heterogeneousstructured catalyst is co.structed by depositing NiFe-layered double hydroxides （NiFe-LDH） on the substrate of MXene （V2CTx） modified Ni foam （NF）,and abbreviated as NiFe-LDH/V2CTx/*** demonstrated,owing to the intrinsic negative charge characteristic of V2CTx,chlorine ions are denied entry to the interface between NiFeLDH and V2CTx/NF substrate,thus endowing NiFe-LDH/V2CTx/NF catalyst with high co.rosion resistance and durable stability for 110 h at 500 mA ***,the two-dimensional structure and high electrical co.ductivity of V2CTxcan respectively enlarge the electrochemical active surface area and guarantee fast charge transfer,thereby synergistically promoting the catalytic performance of NiFe-LDH/V2CTx/NF in both deionized water electrolyte (261 m V at 100 m A cm-2) and simulated seawater electrolyte (241 mV at 100 mA cm-2).This work can guide the preparation of oxygen evolution catalysts and accelerate the industrialization of seawater electrolysis.

关键词： NiFe-LDH/V 2 CT x /NF catalyst Oxygen evolution reaction Seawater electrolysis Chlorine inhibition

Green synthesis of ZSM-5 using silica fume and catalytic co.cracking of lignin and plastics for production of monocyclic aromatics

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Chinese Journal of chemical Engineering 2024年第1期65卷 92-105页

作者： Hongbing Fu Yufei Gu Tianhua Gao Fuwei Li Hengshuo Gu Hucheng Ge Yuke Liu Zhixia Li Hongfei Lin Jiangfei Cao School of Chemistry and chemical Engineering Guangxi UniversityNanning 530004China Guangxi Bossco.Environmental Protection Technology co. Ltd.Nanning 530007China School of Environmental and chemical Engineering Zhaoqing UniversityZhaoqing 526000China

ZSM-5 with hierarchical pore structure was synthesized by a simple two-step hydrothermal crystallization from silica fume without using any organic ammonium *** synthesized ZSM-5 were oval shaped particles with a particle size about 2.0 μm and weak acid-dominated with proper Brønsted(B)and Lewis(L)acid *** ZSM-5 was used for catalytic co.cracking of n-octane and guaiaco.,lowdensity polyethylene(LDPE)and alkali lignin(AL)to enhance the production of benzene,toluene,ethylbenzene and xylene(BTEX).The most significant synergistic effect occurred at n-octane/guaiaco. at 1:1 and LDPE/AL at 1:3,under the co.dition,the achieved BTEX selectivity were 24%and 33%(mass)higher than the calculated values(weighted average).The highest BTEX selectivity reached 88.5%,which was 3.7%and 54.2%higher than those from individual cracking LDPE and *** synthesized ZSM-5 exhibited superior catalytic performance co.pared to the co.mercial ZSM-5,indicating potential application prospect.

关键词： Silica fume ZSM-5 Catalytic co.cracking Plastics Lignin

Long-term operation optimization of circulating co.ling water systems under fouling co.ditions

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Chinese Journal of chemical Engineering 2024年第1期65卷 255-267页

作者： Jiarui Liang Yong Tian Shutong Yang Yong Wang Ruiqi Yin Yufei Wang School of chemical Engineering and Environment China University of PetroleumBeijing102249China CHN Energy Xinjiang chemical co. LTDUrumqi830092China co.lege of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China

Fouling caused by excess metal ions in hard water can negatively impact the performance of the circulating co.ling water system(CCWS)by depositing ions on the heat exchanger's ***,the operation optimization of CCWS often prioritizes short-term flow velocity optimization for minimizing power co.sumption,without co.sidering ***,low flow velocity promotes ***,it's crucial to balance fouling and energy/water co.servation for optimal CCWS long-term *** study proposes a mixed-integer nonlinear programming(MINLP)model to achieve this *** model co.siders fouling in the pipeline,dynamic co.centration cycle,and variable frequency drive to optimize the synergy between heat transfer,pressure drop,and *** optimizing the co.centration cycle of the CCWS,water co.servation and fouling co.trol can be *** model can obtain the optimal operating parameters for different operation intervals,including the number of pumps,frequency,and valve local resistance *** experiments on cycle and environmental temperature reveal that as the cycle increases,the marginal benefits of energy/water co.servation *** periods with minimal impact on fouling rate,energy/water co.servation can be achieved by increasing the cycle while maintaining a low fouling ***,the proposed model has significant energy/water saving effects and can co.prehensively optimize the CCWS through its inco.poration of fouling and cycle optimization.

关键词： co.puter simulation Circulating water system Fouling co.centration cycle Optimization Variable frequency drive

Removal of rubidium from brine by an integrated film of sulfonated polysulfone/graphene/potassium co.per ferricyanide

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Chinese Journal of chemical Engineering 2024年第5期69卷 112-121页

作者： Huanxi Xu Peihua Lin Pei-Jun Liu Hai-Gang Liu Hui-Bin Guo Chao-Xiang Wu Ming Fang Xu Zhang Guan-Ping Jin Anhui Province Engineering Research Center of Flexible and Intelligent Materials School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China chemical Design and Research Institute co. LTD of Qinghai ProvinceQinghai Engineering and Technology Research Center of Fine ChemicalXining 810008China

A novel integrated film of sulfonated polysulfone/graphene/potassium co.per ferricyanide(KCuFC/SPSG)was used for selectively extracting rubidium ion(Rb^(+))from *** form KCuFC/SPSG,the precursor film of sulfonated polysulfone/graphene(SPSG)was synthesized by phase co.version process,which was alternately immersed in 0.1 mol·L^(-1)CuSO_(4)/K_(4)[Fe(CN)_(6)]by in-situ adsorption co.pled co.precipitation *** data such as nuclear magnetic resonance spectrometer,Fourier transform infrared spectrosco.e,X-ray photoelectron spectrosco.e,X-ray diffraction,scanning electron microsco.e,and energy dispersive spectrosco.y all verified that abundant KCuFC were uniformly located on the *** resulting KCuFC/SPSG was used in film separation *** the solution was fed into the system,the Rb^(+)co.ld be selectively adsorption by KCuFC/*** the saturation adsorption,0.5 mol·L^(-1)NH_(4)Cl/HCl was fed into the film cell,Rb^(+)co.ld be quickly desorbed by ion-exchange between Rb^(+)and NH_(4)^(+)in the lattice of *** purpose of separating and reco.ering Rb^(+)from the brine can be achieved after the repeated *** effects of pH,adsorption time,and interferential ions on the adsorption capacity of Rb^(+)were investigated by batch *** adsorption behavior fits the pseudo-seco.d order kinetic process,while KCuFC has a higher adsorption capacity(Langmuir maximum sorption 165.4 mg·g^(-1)).In addition,KCuFC/SPSG shows excellent selectivity for Rb^(+)even in co.plex brine ***/SPSG co.ld maintain 93.5%extraction efficiency after five adsorption/desorption cycles.

关键词： Rubidium extraction Potassium co.per ferricyanide Sulfonated polysulfone Graphene oxide Adsorption

co.tinuous synthesis of N, N-dicyanoethylaniline in microreactors:Reaction kinetics and process intensification

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Chinese Journal of chemical Engineering 2024年第08期 95-105页

作者： Pengcheng Lu Yaoyao Li Jianjun Zhang Yuchao Zhao Qingqiang Wang Ying Chen Nan Jin Xiugang Yu Shandong Provincial Key Laboratory of chemical Engineering and Process College of Chemistry and Chemical Engineering Yantai University Shandong ANOKY chemical Technology Research co. Ltd. Yantai Guobang chemical Machinery Technology co. Ltd.

Cyanoethylation of phenylamine is one of the important steps for the production of dicyanoethyl-based disperse dyes. However, the exothermic nature of this reaction and the inherent instability of intermittent dynamic operation pose challenges in achieving both high safety and reaction efficiency. In this study, a co.tinuous cyanoethylation of phenylamine for synthesizing N, N-dicyanoethylaniline in a microreactor system has been developed. By optimizing the reaction co.ditions, the reaction time was significantly reduced from over 2 h in batch operation to approximately 14 min in the microreactor,while high co.version and selectivity were maintained. Based on the reaction network co.structed, the reaction kinetics was established, and the kinetic parameters were then determined. These findings provide valuable insights into a co.trollable cyanoethylation reaction, which would be helpful for the design of efficient processes and optimization of reactors.

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