SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jianwei Yuan,Chengcheng Zhou,Jiawei Zheng,Qianqian Jia,Zhenggang Wang,Haipeng Zhu,Guozhen Liu,Yanan Guo,Zhenwei Zhang,Shuping Zhang,Pin Zhou,Gongping Liu,Wanqin Jin
The membrane-based pervaporation process presents substantial promise for the challenging separation of azeotropic mixtures. However, the efficiency of conventional polymeric membranes in achieving this remains suboptimal. To tackle this issue, there has been notable attention directed towards the amalgamation of metal–organic frameworks (MOFs) with polymer matrices, giving rise to the creation of mixed matrix membranes (MMMs). In this study, for the first time, we integrated MOF-303 crystals into a chitosan (CS) matrix, thereby pioneering the development of MOF-303/CS MMMs designed for the separation of azeotropic mixtures of methanol/methyl tert -butyl ether (MTBE). By employing the spin-coating method, a thin and defect-free MOF-303/CS membrane layer was effectively deposited onto a porous substrate. The morphology and physiochemical attributes of the synthesized MOF-303 crystals and the subsequent MOF-303/CS MMMs were analyzed using techniques such as SEM, XRD, TGS, and FTIR. The separation data revealed a marked enhancement in flux and methanol permeance upon the introduction of MOF-303 crystals into the CS membrane, whereas the increase in MTBE flux and permeance was relatively few, resulting in an augmented methanol/MTBE separation factor and selectivity. The optimized MOF-303/CS MMM demonstrated outstanding and enduring separation efficacy, demonstrating a total flux of 173 g/m 2 ·h and a methanol/MTBE separation factor of 209 at 40 °C for 10 wt% methanol-MTBE mixtures. Notably, this performance surpassed that of the pure CS membrane by nearly 1.6 times in total flux and 3.68 times in separation factor, respectively, underscoring its substantial potential in the efficient separation of azeotropic mixtures.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Qian Wang,Changchao Zhou,Li Shen,Eryue Song,Yu Yang,Haiqian Lian,Rujing Hou,Yichang Pan
The pervaporation (PV) technology is attractive for azeotrope component separation of the MeOH/MTBE mixture due to the reduced energy and cost relative to the traditional ternary distillation process. However, the membrane separation performance is largely affected by its microstructure including pore size and shape as well as its surface properties such as hydrophilicity. Herein, we report a Co-gallate MOF membrane that features preferential adsorption and diffusion of methanol (MeOH) relative to the methyl tert -butyl ether (MTBE) molecules during the PV separation process. The high-quality Co-gallate MOF membrane has been prepared by introducing a regulator of KOH. The MeOH flux of the Co-gallate MOF membrane was 0.565 kg m −2 h −1 and the separation factor was up to 721 at 15 wt% MeOH/MTBE feed composition. It is worth noting that the separation performance exceeds most of the reported membrane materials for MeOH/MTBE separation in the PV process. Furthermore, the separation performance of the Co-gallate MOF membrane for MeOH/MTBE mixtures remained almost unchanged over 70 h, indicating the reliable long-term stability of the membrane. Thus, the Co-gallate MOF membrane demonstrated a potential practical application for MeOH/MTBE separation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2013
·
IF 5.257
Peng Liao,Songhu Yuan,Mingjie Chen,Man Tong,Wenjing Xie,Peng Zhang
A novel Pd-based electro-Fenton (E-Fenton) process has recently been developed to transform organic contaminants in groundwater. However, it only produces H2O2 and requires addition of Fe2+. In this study, an innovative approach is developed to effectively regulate the generation of Fe2+ from an iron cathode in a three-electrode system in addition to H2O2 production. The Fe2+ is then used for the Pd-catalytic transformation of methyl tert-butyl ether (MTBE) in groundwater. Results from batch experiments suggest Fe2+ accumulation follows pseudo-first-order kinetics with rate quantitatively regulated by current and pH, and MTBE can be completely transformed. In a specially configured three-electrode column using iron as the first cathode, the localized acidic conditions develop automatically in the iron cathode and Pd zone by partitioning the current between the two cathodes, leading to controllable generation of Fe2+ and H2O2. Effects of electrolyte concentrations and types as well as humic acid on MTBE transformation are slight. The stable transformation (∼70%) in a long-term study (20 days) suggests this improved Pd-based E-Fenton process is sustainable to produce Fe2+, H2O2, and appropriate pH conditions simultaneously for transforming organic contaminants. This study presents a new concept of generating Fe2+ from an iron cathode for the processes requiring Fe2+.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yumeng Zhao,Guoshu Gao,Peng Zhu,Haiou Liu,Yu Guo,Xiongfu Zhang
The preparation of stable metal–organic framework tubular membranes for liquid mixture separation has always been a tough problem. Herein, a flexibly prepared, continuous, and stable Al-based CAU-10 membrane with ceramic tubes as support was developed by a thin γ-Al2O3 layer induction method and employed for the first time in the separation of MeOH/MTBE azeotropic mixtures through pervaporation. The γ-Al2O3 layer introduced on the tube by the dip-coating technique not only facilitated the crystal nucleation and continuous growth of CAU-10 membranes but also reinforced the membrane stability by acting as anchoring sites between the membrane and the substrate. The as-prepared CAU-10 tubular membrane exhibited excellent separation performance for MeOH/MTBE mixtures owing to its suitable pore size and good hydrophilicity. For the separation of 14.3 wt % MeOH/MTBE azeotropic mixtures, the membrane displayed a permeation flux of 1.76 kg/(m2 h) and a high separation factor of 2041 at 50 °C, which is better than most of the membranes reported for the pervaporation separation of MeOH/MTBE mixtures. More excitedly, the CAU-10 tubular membrane continued to be tested for more than 7 days without any obvious change in pervaporation performance, demonstrating its outstanding operational and hydrothermal stability. Accordingly, the CAU-10 tubular membrane would be a promising alternative to separate the MeOH/MTBE azeotropic mixtures due to its easy preparation, high performance, and excellent stability.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Guoshu Gao,Yumeng Zhao,Peng Zhu,Haiou Liu,Xiongfu Zhang,Yu Guo,Guohui Yang
The Co-gallate MOF membrane exhibits great potential for separating MeOH/MTBE mixtures due to its regular pore size, exceptional stability, and high hydrophilicity. Nevertheless, the rapid nucleation and growth rate of the Co-gallate crystals in the synthesis solution cause poor nucleation on the substrate surface, which presents a significant challenge for the preparation of continuous Co-gallate membranes. In this study, we presented a cobalt carbonate hydroxide nanowire array (Co-NWA)-induced strategy that enabled the rapid and defect-free synthesis of tubular Co-gallate membranes within just 1 h. The presynthesized Co-NWAs on the substrate played as nucleation centers and anchoring sites, facilitating robust membrane formation. The effects of various synthesis parameters on the crystal morphology and membrane compactness were systematically examined. The optimized Co-gallate membrane demonstrated excellent pervaporation performance, with a permeation flux of 2.03 kg m–2 h–1 and a separation factor of 6711 for a 14.3/85.7 wt % MeOH/MTBE mixture, maintaining high performance for over 100 h, indicative of its remarkable long-term stability. This Co-NWA-induced synthesis strategy presents a promising approach for the industrial-scale application of Co-gallate MOF membranes and the design of other MOF membranes, thereby advancing their utility in requisite liquid separation processes.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhiru Xu,Ligang Xu,Yali Wang,Qunyan Li,Suping Cui,Zuoren Nie,Qi Wei
The separation of methyl tertiary butyl ether (MTBE) from aqueous solution by pervaporation-based membrane technology has attracted much attention recently. The present work proposed a novel strategy to enhance the MTBE/water separation performance of porous α-Al 2 O 3 membranes. ZnO seeds were planted on the surface of α-Al 2 O 3 membranes by the deposition and decomposition of zinc acetate, followed by growing ZnO nanorod arrays (ZNA) on the seeded α-Al 2 O 3 membranes by hydrothermal reaction in the mixed hydrated zinc nitrate (HZN) and hexamethylenetetramine (HMTA) solution. Finally, the membranes were hydrophobized by grafting fluoroalkylsilane (FAS) onto their surface. The results show that the MTBE/water separation factor has been dramatically promoted from 7.7 for the α-Al 2 O 3 membranes to 55.7 for the ZNA-covered α-Al 2 O 3 membranes. The promotion may be attributed to the nearly vertically aligned ZnO nanorod arrays, which provide much surface area to load more fluorocarbon groups that are amiable to MTBE molecules and supply a superhydrophobic surface. The MTBE in the permeate mixture has been concentrated to as high as 72.9 wt%, in striking contrast to 4.6 wt% in the feed solution. The obtained membranes are highly stable upon long-term operation.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering Journal Advances
·
2025
·
IF 7.1
Xiaoyu Fang,Shucai Zhang,Yan Xie,Meng Yao,Diannan Lu,Yakui Chen
The widespread use of methyl tert-butyl ether (MTBE) in gasoline has led to persistent groundwater contamination. Recently, permeable reactive barriers (PRBs) have emerged as a key in situ remediation technology for treating with such contamination. Various reactive media have been employed to intercept and degrade pollutants, but their short half-lives, instability, and poor dispersion in heterogeneous geological conditions limit their effectiveness and further applications. In this study, we designed a double-column PRB system incorporating slow-release oxidants (PLA@CP-CA) and Fe-based zeolite as heterogeneous Fenton catalysts. Calcium peroxide (CaO₂) was selected as the oxidant instead of hydrogen peroxide (H₂O₂) due to its higher stability, ease of transport, and prolonged release, facilitating sustained pollutant degradation. However, the direct use of CaO₂ raises groundwater pH, so citric acid (CA) was employed as a buffer to regulate pH during CaO₂ dissolution, thereby enhancing the efficiency of the heterogeneous Fenton process. Electron paramagnetic resonance (EPR) spectroscopy and radical trapping experiments confirmed that multiple reactive species, including ·OH, O 2 – ·, and ¹O₂, contributed synergistically to MTBE degradation. To mitigate calcium peroxide leakage, polylactic acid (PLA) was used to encapsulate the oxidant (PLA@CP-CA) under anhydrous conditions. The Box–Behnken design (BBD) in response surface methodology (RSM) optimized the PLA@CP-CA formulation, achieving an optimal H₂O₂ release capacity of 3.22 mmol/g with a mass ratio of PLA/CP/CA at 0.67:1.77:1.17. Approximately 97% of MTBE was remediated within 192 hours using the double-column PRB, demonstrating the efficacy of the controlled oxidant release from PLA@CP-CA in promoting MTBE degradation. This heterogeneous Fenton system, combining PLA@CP-CA with Fe-S-1, offers a promising approach for in situ remediation in MTBE-contaminated environments.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 6
·4803-4809
·
IF 3.84
Jing-jing Li,Fei Zhou,Xiao-dong Tang,Tao Hu,Jin Cheng
With the increasing awareness of environmental protection, deep desulfurization of methyl tert-butyl ether (MTBE), which is the most important octane booster in gasoline, is extremely urgent. Herein, a new desulfurization method, involving the combination of electrochemical oxidation and distillation, is proposed to reduce the sulfur content in MTBE. Under optimum operating conditions, the sulfur content of real MTBE decreases from 132.5 μg g−1 to 2.3 μg g−1 and the desulfurization efficiency reaches 98.25%. The oxidation products with high boiling points can be separated by distillation. FTIR analyses prove that electrochemical oxidation has no influence on the main properties of MTBE. Moreover, GC/MS is used to study the conversion of model organic sulfides (dimethyl disulfide, diethyl sulfide and butyl mercaptan) in the electrochemical oxidative desulfurization process. Finally, the possible reaction mechanism of the electrochemical oxidative desulfurization of MTBE is proposed.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2015
·
IF 3.091
Jun Li,Chenjia You,Zhaoxian Lyu,Chi Zhang,Lifang Chen,Zhiwen Qi
To reduce the heavy energy consumption of the conventional dehydration process of bioethanol production from biomass fermentation broth, this work aims to develop a fuel-based ethanol dehydration process directly extracted by gasoline additive. Methyl tert -butyl ether (MTBE) is screened and validated as an available entrainer of heteroazeotropic distillation from gasoline additives by analyzing and determining residue curve maps on the basis of simulation and experimental method. Two fuel-based ethanol separation processes with MTBE as entrainer, i.e. direct-cycle scheme and three-column scheme, are proposed and optimized by using ASPEN PLUS. It indicates that the proposed dehydration process with MTBE as entrainer can significantly reduce the energy and entrainer consumption, and the product can be directly used in gas pool. The techno-economic evaluation indicates MTBE scheme with 8000 ton/year ethanol production presents lower capital and utility costs than isooctane scheme.
研究领域:
生物工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yanhui Zhong,Wanting Huang,Chuang Zhang,Runkun Zhang,Yufei Hu,Xiaohua Xiao,Gongke Li
The addition of methyl tert-butyl ether (MTBE) can increase the octane number of gasoline to improve the combustion efficiency of gasoline. Because of the health effects on the population exposed to MTBE, limiting the addition of MTBE in gasoline will be thefuture development tendency. Here, a cyclic cataluminescence (CCTL) sensor array was utilized to monitor the addition of MTBE in gasoline. CCTL sensor obtained multistage signals ( I n ) on a single catalyst, which realized the function of the sensor array. MTBE trigger-CCTL reaction on 4 kinds of catalysts was investigated. Three brands (No. 92, 95, and 98) of gasoline triggered the CCTL reaction to obtain I n which conforms to the exponential decay equation (EDE). CCTL sensor was used to detect the volume ratio of MTBE to gasoline according to A and τ -values. The I n was applied to normalize and distinguish gasoline through linear discriminate analysis (LDA) and hierarchical cluster analysis (HCA). The τ -values of gasoline on 4 catalysts generated a digital code to differentiate each gasoline. CCTL virtual sensor arrays own the sensor array function and provide a promising technology for gasoline quality analysis.
研究领域:
化学传感
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shenyi Tang,Chenglian Luo,Zhi Wang,Xinlei Liu
A defect-free and stable metal–organic framework (MOF) membrane is a promising candidate for the separation of methanol/methyl tertiary butyl ether (MeOH/MTBE) mixtures. In this work, a structural-integrity and low-thickness (∼400 nm) UiO-66 membrane was fabricated by regulating the metal ion/ligand molar ratio in the synthesis solution and optimizing the preparation process using the secondary growth method with safer and more environment-friendly Zr(n-OPr)4 metal source. Based on the effective pore size and inherent amphiphilic structure of UiO-66, the membrane exhibits exceptional pervaporation (PV) performance. For the separation of MeOH/MTBE (5:95 wt/wt %) mixtures, the membrane displays an outstanding separation performance with an average separation factor of 2.23 × 104 and an average total flux of 3.61 kg·m–2·h–1 at 40 °C, which is superior to most membranes reported for the PV separation of MeOH/MTBE mixtures. In addition, a 72 h PV process was used to further confirm the structural stability of the membrane.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Wen-Jing Wang,Wen-Yan Pan,Xue-Ling Wei,Bo Song,Yu-Ling Luo
Zeolite membranes possess great application prospects in purifying chemical substances, however, the current synthetic conditions are insufficient to eliminate defects, restricting the industrial applications of zeolite membranes. In this study, compact X-type zeolite membranes were synthesized in hetero-alkali-metal cation synthesis solutions via in-situ heating method. The obtained X-type zeolite membrane possessed a methanol/methyl tert-butyl ether (MTBE) separation factor greater than 10,000 at a permeation flux of 1.3 kg m −2 h −1 . A possible mechanism for the influence of hetero alkali meatal cations on the formation of zeolite membranes was proposed, which involved structural induction and regulation of the rates of crystal nucleation and growth. The hetero-alkali-metal cations entering the zeolite crystal caused distortion of the crystal structure, which promoted transformation of the zeolite crystal structure and accelerated crystal growth. Meanwhile, the rates of crystal nucleation and growth on the surface of the support were regulated by the cooperative action of the hetero-alkali-metal cations and Na + in the synthesis solution through their solubility for the aluminosilicate gel, leading to the formation of compact zeolite membranes. This method controlled the zeolite crystal structure and compactness of the zeolite membrane by simply adding hetero-alkali-metal cations to the synthesis solution, providing a new idea for designing defect-free membranes with high permselectivity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）