Introduction
Chemical Industry and Engineering
ISSN 1004-9533
CN 12-1102/TQ
Supervised by: Tianjin Bohai Chemical Industry Group Co., Ltd.
Sponsored by: Chemical Industry and Engineering Society of Tianjin; Tianjin University
Year of Establishment: 1984
Language: Chinese
Publication Frequency: Bimonthly
Place of Publication: Tianjin
Domestic Postal Distribution Code：18-156
Overseas Postal Distribution Code：BM3064
Hot Paper
Controlled synthesis of layered titanate H_2Ti_3O7 and its lithium-ion adsorption performance
XUE Chen;BAI Shengchi;LI Jianming;WANG Xiaoqi;XIAO Qi;As a core strategic resource for new energy applications, the development of efficient lithium extraction technologies is urgently needed. This study addresses the kinetic limitations of traditional salt lake lithium recovery by constructing an H_2Ti_3O7-type titanium-based lithium-ion sieve(LIS) through low-temperature hydrothermal synthesis(40—160 ℃). The HTO80 sample synthesized at 80 ℃ exhibits a specific surface area of 422.0 m2·g-1 and delivers a Li+ adsorption capacity of 14.1 mg·g-1 at pH 6.5, achieving 93.6% of its equilibrium capacity within 10 minutes while retaining 78% capacity after five adsorption-desorption cycles. The adsorption process aligns with pseudo-second-order kinetics and the Langmuir monolayer model, confirming selective H+/Li+ ion exchange as the dominant mechanism, with exceptional Li+ specificity. This work provides a novel strategy for high-efficiency salt lake lithium extraction, demonstrating the significant potential of H_2Ti_3O7-based materials in lithium recovery technologies.
Impact of the phase transformation of γ-Fe_2O3 nanoparticles on the performance of Y-type zeolite
QIN Pengjian;LIU Qianqian;REN Fei;Catalytic cracking is a key technology in modern petroleum refining, with Y-type zeolite serving as the core material of FCC catalysts due to its exceptional hydrothermal stability and catalytic activity. However, iron poisoning significantly impacts catalyst performance. This study investigates the interaction mechanisms between iron oxides(γ-Fe_2O3 and α-Fe_2O3) and zeolite under high-temperature conditions using magnetic susceptibility measurement, XRD, FTIR, NMR, and BET characterizations. The results indicate that zeolite interact with γ-Fe_2O3 through hydroxyl groups, effectively inhibiting its aggregation and increasing its complete phase transition temperature from approximately 600 ℃ to 700 ℃. However, this interaction also leads to a reduction in hydroxyl groups and a degradation of acidic functional sites in the zeolite. In contrast, α-Fe_2O3 significantly reduces the thermal stability of the zeolite, lowering its collapse temperature to 975 ℃, accelerating pore collapse and crystallinity loss, which results in a substantial decrease in surface area and pore volume, ultimately compromising the performance of zeolite.
High-entropy oxide supported Ni catalyst for CO2 hydrogenation to methane
XIAO Fei;JIANG Ya'nan;XING Rui;LIU Rong;LIU Yuan;BAI Yang;The oxygen vacancy and high dispersion of nickel metal are the key factors for the Ni-based catalyst for hydrogenation of methane from CO2. High entropy oxides(HEOs) composed of five or more metal cations are prone to the formation of surface oxygen vacancies and facilitate the high dispersion of the contained ions. In this paper,(CeZrYLaTi)O2 fluorite HEOs catalyst supported by nickel was prepared by citric acid complexation method. The catalyst was used for hydrogenation of CO2 to methane. The results show that nickel on HEOs and the mixed oxides composed of Ce, Zr, Y, La and Ti has high dispersion, good anti-sintering and anti-carbon properties, and easy to form oxygen vacancy on the surface, showing excellent hydrogenation performance of CO2 to methane. Compared with HEOs, the mixed oxide-supported nickel catalyst composed of five metal ions(Ce, Zr, Y, La and Ti) has higher activity and stability, because of its lower calcination temperature, higher specific surface area, and more conducive to CO2 activation.
Synthesis of iron-manganese sulfides for electrocatalytic H_2O2 activation to degrade atrazine
XU Yalong;LI Yang;FAN Xiaobin;XIA Qing;PENG Wenchao;In order to reduce the energy consumption and the leaching of iron ions in the electro-Fenton process, a high active cathode of Mn-FeS/GF in-situ loading in graphite felt(GF) was synthesized by in-situ reduction and sulphuration. Mn-FeS/GF has excellent activity and stability to activate H_2O2 for ATZ degradation, and the leaching of metal ions was small. In addition, the introduction of Mn element can result in a significant increase of the electro-Fenton activity at a low potential, which is important for the practical application of the electro-Fenton process.
Preparation of Diels-Alder type shape memory polyurethane
LI Pengxiang;NING Jiaoyi;HAN Xu;Self-healing polyurethanes can repair the microcracks or defects of materials, and the bismaleimide(BMI) is usually used as the cross-linking agents and Diels-Alder bond providers of self-healing polyurethanes. In order to further improve the self-healing and mechanical properties of materials, BMI was replaced and shape memory effect was introduced. The trimaleimide(TMI) was synthesized using N, N-bis(2-aminoethyl)ethylenediamine and introduced into polyurethanes as the cross-linking agent. Meanwhile, polycaprolactone diol(PCL) was used as the soft chain segment in polyurethanes. The shape-memory polyurethanes(DA-SM-PU-x, x=0, 1, 2, 3) of Diels-Alder type have been successfully synthesized. The strain of the DA-SM-PU-3 can recover 99.1% after placing at 120 ℃ for 1 h and 60 ℃ for 12 h. Tensile tests show that DA-SM-PU-3 has satisfactory tensile strength(25.1 MPa) and strain(1 364%), and can be basically restored to original shape after 350% strain, indicating the excellent shape memory performance of DA-SM-PU-3. Moreover, the addition of TMI has no impact on the reprocessing performance of polyurethanes, and DA-SM-PU-3 can still remain >95% mechanical properties after 4 cycles. The introduction of TMI and shape memory effect improves the mechanical and self-healing properties of the materials.
Research on dehydration of sorbitol to isosorbitol by Zr doped titanium dioxide catalyst
Zhang Baozhong;Sulfated TiO2 catalysts (MST) with mesoporous structure were prepared by coprecipitation method， and the activity and selectivity of the catalyst were enhanced by doping with zirconium oxide. The composition， structure， and acidity of the catalyst were studied through various characterization methods， and the effects of reaction temperature， reaction time， catalyst dosage， and Zr doping on the catalytic dehydration performance of the catalyst for sorbitol were explored. The research results indicate that the Zr(x)-MST catalysts are sulfated rutile type TiO2; An appropriate amount of Zr doping (Zr/Ti atom ratio = 10%) can significantly increase the surface acidity of the catalyst; At a reaction temperature of 180 ℃ and a reaction time of 2 h， with a catalyst dosage of 4%(mass fraction) and Zr (10) - MST as the catalyst， the conversion rate of sorbitol and the yield of isosorbitol can reach 96.7% and 76.5%， respectively.
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Synthesis and properties of a rotative heteronuclear rare earth transition metal complex [PrCu6(μ-OH)3(Gly)6Im6](ClO4)4·4H2O
HUANG Xue;Lü Xuechuan;LI Xia;GUO Meiqi;HU Xuemeng;GAO Xiaohan;The μ3-OH bridge heteronuclear rare earth metal complex (CCDC: 2298245) was constructed from praseodymium perchlorate， copper perchlorate， glycine and imidazole by solvent volatilization method. The structure， infrared spectrum， magnetic， fluorescent and thermodynamic properties of the complexes were studied. The results show that the complex belongs to the R3 space group in the tripartite system， a = 15.8448(3) ?， b = 15.8448(3) ?， c = 23.4524(9) ?， α = β = 90 °， γ = 120 °. Pr is the coordination center atom， located in the center of the prism formed by six copper atoms. Pr coordinated with nine oxygen atoms to form a triple crown triangular prism. Under the action of π-π bond， a wheel molecular structure is formed. Complexes have weak fluorescence， and the luminescence behavior is based on the emission of ligands. The antiferromagnetic interaction between metal ions in the complex can be deduced from the results of magnetic study.
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Preparation and separation performance of nanoparticles/graphene oxide modified composite membrane
ZHOU Jianmin;LI Fei;FEI Liting;LIU Jie;JI Zhiyong;ZHAO Yingying;WANG Jing;GUO Xiaofu;WANG Shizhao;YUAN Junsheng;BI Jingtao;LIU Fengzhen;On the surface of polyamide nanofiltration membranes (NF)， two nanoparticle intercalated graphene oxide composite membranes were loaded through the method of vacuum extraction filtration and pressure spraying. The mass ratio of graphene oxide (GO) and silicon dioxide (SiO2) for the composite membranes GOS1， GOS2， GOS3， GOS4 were 1:1， 2:1， 3:1， 4:1. The mass ratio of graphene oxide (GO) and titanium dioxide (TiO2) for the composite membranes GOT1， GOT2， GOT3， GOT4 were 1:1， 2:1， 3:1， 4:1. GOT and GOS composite membranes were characterized by SEM， EDS，XPS and GIWAXS. The results indicated that GO and nanoparticles were uniformly loaded on the surface of polyamide nanofiltration membrane. The properties of the composite membranes were studied， and the water purification mechanism of the composite membranes was speculated. The water flux of GOT composite membrane can reach 50 L·m-2·h-1 at 0.75 MPa， which is 25% higher than that of the original substrate. The GOT composite membrane has the higher flux and maintain a higher flux compared with the original base membrane. At the same time， it can maintain a rejection rate of about 90% for salt solution and heavy metal ions. This topic provides a new process idea for the preparation of graphene oxide composite membranes and a composite membrane with higher purification efficiency for wastewater treatment.
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Degradation of Aniline by Dissolved Oxygen Catalyzed by Fe(Ⅱ)/Sulfite System
Lin Yiying;Song Baodong;Oxidation of aniline by dissolved oxygen(DO) catalyzed by the Fe(Ⅱ)/sulfite system was investigated in this study, and the oxidizing species involved in the oxidation process were also explored. The results showed that pH 4.0 and the molar ratio of sulfite: Fe(Ⅱ) of 10:1 were the optimal experimental conditions for aniline degradation, and 70% aniline could be removed. Fe(Ⅱ) plays an important role in the catalytic oxidation of aniline, and the removal efficiency of aniline was less than 30% in the presence of sulfite alone, and the reaction time was also prolonged from 90 min to 40 h. In the Fe(Ⅱ)/sulfite system, all Fe(Ⅱ) would be oxidized to Fe(Ⅲ) at pH 3.0, while Fe(Ⅱ) and Fe(Ⅲ) mostly existed in the complexed forms except pH 3.0. Quenching experiments in the presence of tert-butyl alcohol and methanol further confirmed that the SO4·– was the main oxidation species and SO5·– was the secondary oxidation species. This finding enriches our understanding on the degradation of organic pollutants by DO and the Fe(Ⅱ)/sulfite system, indicating that it has a wide application prospect in the treatment of organic industrial wastewater.
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Capacitor performance of Hollow Rod-Shaped Metal-Organic Framework and its Derived Metal Phosphate
Yu Shengpan;Huang Chengde;In order to obtain a supercapacitor positive electrode material with a higher specific capacity, the capacitance performance of polymetallic organic frameworks and their derivatives was studied on the basis of a single metal-organic framework material(MOF), and polymetallic organics were prepared with different proportions of metal elements(Ni, Co). The MOF material is further obtained as a nano-scale hollow rod-shaped metal phosphate. When the metal element ratio of Ni: Co is 8: 1 in the raw material,the metal phosphate has the maximum specific capacitance value of 895.29 F·g-1.
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Basic Principle,Advance and Current Application Situation of Sol-Gel Method
WANG Juan,LI Chen,XU Bo(Huainan Normal University,Huainan 232001,Anhui Province,China)Sol-gel method is a method for material preparation under mild condition.In this paper,basic principles of sol-gel method and the main step are briefly described,the application and the prospects for development of sol-gel method in the of preparation process compound materials are discussed.
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A Review of Studies on the Discharging Dispersion of Flammable and Toxic Gases
Ding Xinwei Wang Shulan Xu Guoqing (Dalean University of Technology,Dalian 116012)The computing models and experiments of flammable or toxic gas dispersion in the atmosphere are summarized.The models include Gaussian plume/puff model,B.M.model,Sutton model and FEM3 model.The experiments include Burros,Coyote,Desert Tortoise Goldfish etc.
Progress in the Development and Application of Reverse Osmosis Membrane Technology
XU Jun1,2,3,WANG Zhi1,2,3,WANG Ji-xiao1,2,3,WANG Shi-chang1,3(1.School of Chemical Engineering and Technology,Tianjin University,Chemical Engineering Research Center,Tianjin 300072,China;2.State Key Laboratory of Chemical Engineering(Tianjin University),Tianjin 300072,China;3.Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin 300072,China)Reverse osmosis membrane technology,a new and widely used separation technology arose in 1 960 s,is one of the most advanced separation technologies at present.Reverse osmosis is the inverse process of osmosis and is driven by pressure.In this paper,the background and the development of re-verse osmosis membrane technology are introduced,and its present research is mainly discussed,and its applications in sweater and brackish water desalination,pure water preparation,pharmacy and chemical industry wastewater treatment are described.Finally,the existing problems and future development trends are analyzed.
[Downloads: 11,517 ] [Citations: 293 ] [Reads: 66 ] HTML PDF Cite this article
Survey of Researches on Scale Inhibition Mechanism of Scale Inhibitor
WANG Rui 1, ZHANG Qi 1, DING Jie 2, SHEN Zi qiu 2 (1.Chem.Eng.Department, School of Sci. & Tech., Hainan University, Hainan Haikou 570228,China; 2.Research Institute of Chem. Eng., Dalian University of Technology, Liaoning Dalian 116012,China)Firstly, a brief retrospect was given on the development of scale inhibitors. Then, some aspects related to the research of scale inhibition mechanism of scale inhibitors and evaluation methods of the performance of scale inhibitors, as wellas the retarding effect on saline water deposition of scale inhibitors were reviewed. Based on the above survey, some aspects remain to be investigated further were proposed.
The Current Status and the Developing Trends of Carbon Dioxide Treating Technologies
LI Tian-cheng\+1, FEN Xia\+2, LI Xin-gang\+1 (1.School of Chemical Engineering,Tianjin University,Tianjin 300072,China; 2.Taiyuan Fereilizer Plant,Shanxi Taiyuan 030021,China)The current status and the developing trends in future of carbon dioxide treating technologies were introduced in this article. Furthermore,the effective ways to solve “greenhouse effect” in the 21centery can be mainly biological methods in separating and fixing carbon dioxide in the air and physical or chemical methods in separating and processing the combusted gases.
Basic Principle,Advance and Current Application Situation of Sol-Gel Method
WANG Juan,LI Chen,XU Bo(Huainan Normal University,Huainan 232001,Anhui Province,China)Sol-gel method is a method for material preparation under mild condition.In this paper,basic principles of sol-gel method and the main step are briefly described,the application and the prospects for development of sol-gel method in the of preparation process compound materials are discussed.
[Downloads: 19,913 ] [Citations: 770 ] [Reads: 51 ] HTML PDF Cite this article
Progress in the Development and Application of Reverse Osmosis Membrane Technology
XU Jun1,2,3,WANG Zhi1,2,3,WANG Ji-xiao1,2,3,WANG Shi-chang1,3(1.School of Chemical Engineering and Technology,Tianjin University,Chemical Engineering Research Center,Tianjin 300072,China;2.State Key Laboratory of Chemical Engineering(Tianjin University),Tianjin 300072,China;3.Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin 300072,China)Reverse osmosis membrane technology,a new and widely used separation technology arose in 1 960 s,is one of the most advanced separation technologies at present.Reverse osmosis is the inverse process of osmosis and is driven by pressure.In this paper,the background and the development of re-verse osmosis membrane technology are introduced,and its present research is mainly discussed,and its applications in sweater and brackish water desalination,pure water preparation,pharmacy and chemical industry wastewater treatment are described.Finally,the existing problems and future development trends are analyzed.
[Downloads: 11,517 ] [Citations: 293 ] [Reads: 66 ] HTML PDF Cite this article
Status and Prospect of Chinese Seawater Desalination Technology
FENG Hou-jun,XIE Chun-gang(Institute of Seawater Desalination and Multipurpose Utilization,State Oceanic Administration,Tianjin 300192,China)This paper analyzes the state-of-the-art and status quo of seawater desalination technology in China during recent years,including multi-stage flash,low temperature multi-effect distillation and reverse osmosis,and discusses current problems and gaps by a comparison between China and other countries with advanced seawater desalination technology.Furthermore,combining domestic needs for seawater desalination technology,this paper also presents the future possible direction and goals of Chinese seawater desalination.
Study on Preparation Technology of Nanoscale TiO2 with Sol-Gel Method
LIAO Dong-liang1,XIAO Xin-yan*1,ZHANG Hui-ping1,WAN Cai-xia2,CHEN Huan-qin1(1.Institute of Chem.Eng,South China University of Technology;2.Department of Applied Chemistry,South China University of Technology,Guangdong Guangzhou 510640,China)In this paper,we prepared nanoscale TiO2 with Ti(OC4H9)4 through solgel method.With the work on several important factors,got the optimal technological conditions for preparing nanoscale TiO2,that is nTi(OC4H9)4∶nH2O∶nC2H5(OH)=1∶2～3∶6～8,the pH of mixture should be adjusted to between 2 and 3,H2O and part of C2H5(OH) mixture should be feed slowly. The suitable temperature of hydrolysis and gel reaction is between 25℃～30℃.
Research progress on the application of silicon-carbon anode materials in lithium-ion batteries
WANG Juan;ZHANG Xianglan;The structure and properties of anode materials are crucial for the capacity and performance of lithium-ion batteries. Silicon/carbon composites are highly regarded as promising anode materials for next-generation batteries due to their high specific capacity. However, the significant volume expansion during cycling hinders their commercialization. The structure and methods to synthesize silicon/carbon materials are key to addressing this issue. This paper provides an review of the lithium storage and failure mechanisms of silicon anodes, summarizes recent progress in silicon carbon anode materials for lithium-ion batteries, focuses on structural design and preparation methods, and assesses the future commercial prospects of silicon/carbon composites.
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