Journal of Environmental Chemical Engineering
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2020
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IF 4.3
John Michael Tesha,Derrick S. Dlamini,Saood Qaseem,Zhenyu Cui,Jianxin Li
Polysulfone–Styrene Maleic Anhydride (PSF/SMA) ultrafiltration (UF) membranes were prepared by the thermally induced phase separation (TIPS) method. The morphology of the UF membranes was fine tuned by varying the concentration of SMA. The surface of the membranes was then modified by dip-coating with β-cyclodextrin (β–CD) and Trimesoyl Chloride (TMC) to form tight UF membranes. The effects of β–CD on the separation performance, structure, and morphology of the flat sheet PSF/SMA membrane were examined. The tight UF membranes were characterized and then tested for the removal of Bovine Serum Albumin (BSA) and Congo red from water. The thickness was varied by increasing the concentration of β-CD. When increasing the concentration of β-CD from 2.0 % w/v to 8.0 % w/v, the thickness of the top layer increased from 8 μm to 18 μm, respectively. Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and X-Ray Photoelectron Spectroscopy (XPS) were used to confirm the successful deposition of the TMC and β-CD at the surface of the membrane. It was also established through Atomic Force Microscopy (AFM) that the roughness of membranes increases with an increase in β-CD concentration. The contact angle of the tight UF PSF/SMA blend membranes declined from 79.8° to 55.9° at the addition of β-CD implying that the hydrophilicity of the membranes improved. The lowest pure water flux of 40 Lm −2 h -1 was achieved by the membrane coated with 8.0 % w/v of β-CD. However, the highest pure water flux of 127 Lm −2 hr −1 was observed on the uncoated PSF/SMA UF membrane at 3 % wt/wt SMA. The highest BSA rejection (94 %) was recorded from PSF/SMA with a coating layer containing 8 % wt/v of β-CD concentration. Furthermore, the maximum Congo red dye rejection (96 %) was achieved by the tight UF membrane when β-CD concentration was 8 wt/v and the SMA was 3 % wt/wt.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Peijian Wang,Jisong Zhang,Kai Wang,Guangsheng Luo,Pei Xie
NH3 was used as acid absorbent to intensify the reactions between aniline and benzoyl chloride in a microstructured chemical system in this work. By suppressing the side reaction, the addition of NH3 could reduce the reaction time needed for 99% reactants conversation to less than 1/10 of the condition without NH3. Furthermore, a complete kinetic model containing two rapid main reactions and two reversible consecutive side reactions was established, and six reaction rate constants and their corresponding activation energies and pre-exponential factors as well as confidence intervals were determined precisely. The accuracy of the obtained parameters was verified by comparing the calculated data with experimental data at extensional temperature. The kinetic model was used to optimize the intensification operating conditions, and effects of reactants concentration, temperature, NH3 addition amount, and NH3 feed methods were discussed based on the simulation results. This work proves that the microstructured chemical system not only provides an effective intensification ability but also develops a reliable platform for kinetic studies.
研究领域:
化学工程
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反应动力学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zhongyue Sun,Hui Qiu,Xinwei Kang,Weiwei Zhou,Wenxin Yan,Feiyong Chen,Jingtao Xu,Daoji Wu,Daliang Xu,Xuewu Zhu
A loose nanofiltration (LNF) membrane with high permeance and excellent dye/salt selectivity is highly desirable for dye/salts recovery from textile wastewater. Herein, commercial and green ribitol (RT) was employed to fabricate the LNF membrane for dye desalination. The hydroxyl in the RT reacted with acyl chloride under the catalysis of sodium hydroxide, forming a polyester film structured with microspheres, negative charge, and hydrophilic networks. The resultant RT-M membrane possessed a smooth and thin active layer with numerous polar groups. The dye desalination performance of the RT-M membrane was tailored by controlling various IP fabrication conditions. The optimized membrane (RT-M1.0) had superior water permeance (100.3 L m −2 h −1 bar −1 ) and satisfactory CR/Na 2 SO 4 selectivity (281.3). Additionally, the RT-M membrane had favorable stability and antifouling properties, demonstrating excellent potential for application in dye desalination. Therefore, a novel approach for fabricating membranes with outstanding dye desalination properties by using RT was proposed to achieve resource recycling.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2021
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IF 3.739
Dihua Wu,Huihui Lu,Xiru Zhang,Chuang Shen,Ting Lü,Xuesong Liu,Sanchuan Yu
Thin-film composite polyesteramide nanofiltration membrane prepared from carboxylated chitosan and trimesoyl chloride was carefully tailored during its fabrication process of interfacial polymerization. The effects of post-curing, mid-drying and the addition of phase transfer catalysts on the membrane properties were studied using single-factor experiment. Post-curing was found to be effective in improving the separation performance of the membrane containing high concentrations of carboxylated chitosan, and the optimal post-curing effect was achieved at a temperature of 40 °C and curing time range of 15−20 min. Mid-drying enhanced the permeation flux and salt rejection of the membrane containing low concentrations of carboxylated chitosan, and the optimum temperature range for the mid-drying process was obtained at 30−40 °C. Furthermore, the membrane properties were susceptible to the addition of phase transfer catalysts, and a uniformly distributed phase transfer catalyst is vital to its influence on membrane properties. The addition of 0.025 wt% benzyltriethylammonium chloride to the aqueous solution exhibited the best effect towards the improvement of the separation performance of the produced membrane.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 40
·19165-19176
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IF 4.682
Liu Jinchang,Shen Chenyang,Liu Qin,Li Yaping,Wang Tong,An Xiaoya,Liang Dingcheng,Xie Qiang
Coal liquefaction residue (CLR) has a high content of carbon and organic substances. However, sulfur and inorganics pose a challenge for the high-value-added utilization of CLR. In this work, general-purpose carbon fiber was successfully prepared by the new method of chlorination–dechlorination using CLR as raw material and benzyl chloride as chlorinating agent. The effect of benzyl chloride addition amount on the property of isotropic pitch precursor and the performance of general-purpose carbon fiber were investigated. The results showed that the as-prepared pitch precursors were dominated by carbon elements and contained small numbers of hydrogen, oxygen, nitrogen, and sulfur. The characteristic peaks generated from chlorine elements were observed in both FTIR and XPS spectra. The peaks at the wavenumbers of 1490 cm −1 and 696 cm −1 corresponded to the vibration of C–Cl bond, and a tiny Cl 2p peak located at 200.0 eV was observed by reducing the noise of XPS spectra. It indicates that the trace chlorine remains in the as-synthesized isotropic pitch precursor even after undergoing dechlorination. The molecular compositions of isotropic pitches were mainly polyaromatic hydrocarbons, and the chlorination–dechlorination promotes the oligomerization of polyaromatic hydrocarbons to form dimers and trimers. Therefore, the polycondensed degree and carbon aromaticity were improved. It is known from 13 C NMR analysis that the effect of chlorine–dechlorination makes the molecular structure of pitches transform more linear, thus enhancing their spinnability. In addition, the higher the amount of benzyl chloride added, the better the property of isotropic pitch was. The pitch of BC-30 and BC-40 showed excellent spinnability, stabilized property, and carbonized property compared to other pitches. The morphology of obtained carbon fiber was homogeneous and smooth without defects in surface and section. The as-prepared general-purpose carbon fiber demonstrated good tensile strength up to 1220 MPa with an average diameter of 8.5 μm. Graphical abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
AICHE JOURNAL
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2015
·Vol. 61
·期 11
·3804-3811
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IF 2.748
Peijian Wang,Kai Wang,Jisong Zhang,Guangsheng Luo
The reaction between aniline and benzoyl chloride is well known for producing high performance polymers and chemicals. But the fast main reaction and reversible consecutive side reaction make process rather complicated and no thorough kinetics study has ever been reported before. A microstructured chemical system, consisting of a micromixer, preheat exchange coiled capillaries, a delay loop, and a microhydrolyzer, was designed to carry out this reaction using N-methyl-2-pyrrolidone as the solvent. A kinetic model was established, and the values of kinetic constants, pre-exponential factors and activation energies of each reaction as well as their confidence intervals were acquired. With this model each substance concentration vs. residence time were obtained to help understand reaction process and further optimize operating conditions. Compared to earlier reports on this reaction, this microstructured chemical system provides more accurate parameters and can develop a reliable platform for kinetic study of similar chemical reactions. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3804–3811, 2015
研究领域:
化学工程
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反应动力学
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DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 33
·24055-24065
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IF 3.9
Xiuzhen Wei,Zelong Chen,Mengjia He,Liangliang Xu,Yue Li,Jia Yang,Xuekang Zhang,Xianghao Zhang,Ze Wang,Shiyu Cao,Qinghua Zhou,Bingjun Pan
Mg–Fe layered hydroxide (LDH) was synthesized by the double titration method and added to trimesoyl chloride (TMC) to prepare an Mg–Fe LDH-modified polyamide nanofiltration (NF) membrane by interfacial polymerization (IP). Compared to the pure polyamide NF membrane, the Mg–Fe LDH-modified membrane presented a wrinkled structure and a comparatively smooth surface. Additionally, the permeation flux and rejection rate of the modified NF membrane for 1000 mg L−1 Na2SO4 solution were 61.7 L m−2 h−1 and 95.9%, respectively. When the Mg–Fe LDH modified NF membrane was used to separate dye/NaCl mixed solutions, the rejection of NaCl was less than 17% and the rejection rate of Coomassie Brilliant Blue (CBB) molecules was close to 100%. At the same time, the concentration of CBB increased from 500 mg L−1 to 1151 mg L−1 which means that the LDH modified NF membrane could separate CBB/NaCl effectively and could concentrate CBB at the same time.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Mengchen Wang,Jiayou Liao,Chengyun Gao,Jiwei Ma,Xianjie Meng,Yinghua Shen,Xu Wu,Yong Wang,Jinping Li
Hyperbranched polyimide (HBPI) membranes have emerged as promising materials for gas separation due to their loose interchain structure and large free volume. However, their widespread application is hindered by challenges such as complex synthesis procedures, high-cost monomers, and poor resistance to plasticization. In this study, a series of Trimesoylchloride (TMC)-branched 6FDA-based PI membranes were successfully synthesized using different contents of TMC as a branching agent to regulate the pore distribution. The molecular structure and degree of branching (DB) of HBPI were characterized using FTIR and 1 H NMR. The incorporation of TMC into the HBPI structure effectively enhanced the permeability and selectivity of the acyl chloride-branched PI membranes while improving thermal stability. The optimized membrane (A5-TMC content is 5%), exhibits the improving O 2 and CO 2 permeabilities of 176.52 and 930.94 Barrer combined with the O 2 /N 2 , CO 2 /N 2 and CO 2 /CH 4 selectivities of 4.68, 24.65 and 23.85, respectively. Particularly, the A5 HBPI membrane, with a DB value of 85.71%, demonstrated superior anti-aging properties compared to linear 6FDA-DAM membrane over 365 days. Most importantly, the 6FDA-DAM-TMC HBPI membranes significantly enhanced the resistance to plasticization at elevated CO 2 feed pressures, maintaining stability up to 300 psi and significantly outperforming the linear 6FDA-DAM membrane. This study provides an effective method for the fabrication of high-performance gas-separated polymer membranes with enhanced plasticization resistance and long-term durability for advanced gas separation applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Ayang Zhou,M.M.A. Almijbilee,Jiandong Zheng,Lei Wang
This paper describes the formation of a new polyarylester thin film vanillin composite membranes for organic solvent nanofiltration (OSN). Vanillin (VA), a naturally occurring monomer, was adopted to synthetize a hydrophobic OSN membrane via interfacial polymerization with trimesoyl chloride (TMC) on the ethylenediamine cross-linked poly(ether imide) substrate (C-PEI). The prepared membrane was proved by chemical characterizations such as ATR-FTIR, XPS etc., it is illustrated that the interfacial polymerization occurs among TMC and VA on the C-PEI support to generate the polyarylester layers with crosslinked polyimide structure, and the further contact angles measurements revealed that the hydrophobicity of the membranes increased with the VA loading. Besides, the study on the relationship between the membrane permeance and the membrane-solvent solubility parameter distance were performed by Hansen solubility parameter methods. The optimal NF-3VA membrane exhibited a higher chemical stability in THF and superior separation performance with the rejection of 93% for crystal violet (CV) and a THF permeance of 4.5 L m -2 h −1 bar −1 , and the separation factor of CV and THF can reach 14 at the optimal condition. These results suggest a novel strategy to select potential monomers to develop advanced membranes applicable to organic solution separation for future sustainable usages.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Tian-Yu Teng,Fan Hu,Yan-Hui Lou,Jun-Jie Cao,Chun-Hao Chen,Yi-Ran Shi,Kai-Li Wang,Jing Chen,Zhao-Kui Wang,Liang-Sheng Liao
Tin-based perovskite solar cells (Sn-PSCs) are emerging as a potential alternative to lead-based PSCs in order to address issues of theoretical efficiency and toxicity limitations. However, due to the structural imperfections on the surface of perovskite films, the numerous defects can cause severe non-radiative recombination loss, which would reduce the efficiency and operational stability of Sn-PSCs. Herein, we used 4-fluorobenzoyl chloride (4FBC) for surface treatment of tin perovskite films. The introduction of 4FBC passivated the defects, improved the surface morphology, slowed down the formation of SnI 2 , suppressed the oxidation of Sn 2+ from top to bottom, and improved the carrier mobility. Encouragingly, the treated device achieved a champion power conversion efficiency of 11.03 % and significantly improved the open-circuit voltage ( V OC ) to 0.94 V, the fill factor (FF) to 86.7 %, which both were the highest V OC and FF values reported in wide-bandgap Sn-PSCs (∼1.6 eV) to date. The findings emphasize the importance of surface treatment for tin halide perovskites and serve as a reference for further reducing the voltage loss in wide-bandgap Sn-PSCs.
研究领域:
材料科学
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光伏技术
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新能源研究
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 10
·2246
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IF 4.2
Shasha Liu,Mei Sun,Can Wu,Kaixuan Zhu,Ying Hu,Meng Shan,Meng Wang,Kai Wu,Jingyi Wu,Zongli Xie,Hai Tang
Dye/salt separation has gained increasing attention in recent years, prompting the quest to find cost-effective and environmentally friendly raw materials for synthesizing high performance nanofiltration (NF) membrane for effective dye/salt separation. Herein, a high-performance loose-structured NF membrane was fabricated via a simple vacuum filtration method using a green nanomaterial, 2,2,6,6-tetramethylpiperidine-1-oxide radical (TEMPO)-oxidized cellulose nanofiber (TOCNF), by sequentially filtrating larger-sized and finer-sized TOCNFs on a microporous substrate, followed by crosslinking with trimesoyl chloride. The resulting TCM membrane possessed a separating layer composed entirely of pure TOCNF, eliminating the need for other polymer or nanomaterial additives. TCM membranes exhibit high performance and effective dye/salt selectivity. Scanning Electron Microscope (SEM) analysis shows that the TCM membrane with the Fine-TOCNF layer has a tight layered structure. Further characterizations via Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) confirmed the presence of functional groups and chemical bonds of the crosslinked membrane. Notably, the optimized TCM-5 membrane exhibits a rejection rate of over 99% for various dyes (Congo red and orange yellow) and 14.2% for NaCl, showcasing a potential candidate for efficient dye wastewater treatment.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Sustainability
·
2024
·Vol. 16
·期 19
·8568
·
IF 3.3
Yuan-Yuan Wang,Dan-Feng Zhang,Hong-Rui Zhang,Wen-Jun Liu,Zhi-Quan Chen,Jun-Cheng Jiang,Lei Ni
In this study, sodium dodecylbenzene sulfonate was used as a stabilizer, and NaOH, TBHP, and benzoyl chloride were used as reactants in the preparation of tert–butyl peroxybenzoate (TBPB) using a two–step process. The process conditions were optimized by a three–factor, three–level Box–Behnken design approach. The results showed that the yield of TBPB achieved 88.93% under the optimum conditions of temperature of 31.50 °C, feeding time of 22.00 min, and NaOH concentration of 15%. The exothermic properties of the synthesis of TBPB were investigated using reaction calorimetry. The thermal decomposition characteristics of reactants and products were analyzed by differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC), and the changes in substance types, characteristic peaks, and exothermic quantities during the reaction were analyzed before and after the reaction by FTIR. The reaction mechanism was proposed by combining EasyMax 102, RC1e, gas chromatography (GC), and Fourier transform infrared spectrometry (FTIR). A comprehensive study of the reaction mechanism and reaction exotherm was carried out using density functional theory (DFT) to predict the reaction energy change and the direction of the reaction and to determine whether the reaction was reversible or not. The risk level for the synthesis of TBPB in semi–batch mode was evaluated using a risk matrix and the Stoessel criticality diagram. The optimal conditions for the TBPB synthesis process in a plate microreactor were explored. Both microreactors and semi–batch modes were comparatively analyzed using the m–ITHI quantitative assessment method. The results indicated a hazard class 2 in semi–batch mode and a hazard class 1 in the microreactor. The results of the study may provide a reference for the further improvement of the intrinsically safe design of the synthetic TBPB process.
研究领域:
化学工程
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过程安全
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热分析
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反应工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）