CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2019
·
IF 3.073
Kai Wang,Yun Qin,Shuai Quan,Yingjie Zhang,Peng Wang,Heng Liang,Jun Ma,Xi Quan Cheng
With suitable pore size, narrow pore size distribution and charged surface, nanofiltration (NF) membranes show great potential in removing or recovering dyes from effluents of printing and dyeing industries. However, low permeance of commercial nanofiltration membranes hampers their widespread application. Herein, we design a kind of high permeance mixed matrix membranes through layer-by-layer (LbL) self-assembly of polyelectrolytes (PEs). The additional solvent pathways constructed by incorporation of UiO-66, a type of Zr-based metal organic frameworks (MOFs), accelerate the water passing through the membranes; the pure water permeance of UiO-66 incorporated PEs membrane (PEM/UiO-66) achieves at as high as 14.8 L m −2 h −1 bar −1 which is 160% higher than the pristine PEs membrane. Meanwhile, the membrane exhibits 96.3% rejection towards MgSO 4 with molecular weight cut off (MWCO) of 464.2 g mol −1 . The comprehensive separation performance of the mixed matrix membrane outperforms most of state-of-the-art NF membranes fabricated by LbL self-assembly to the best of our knowledge. Most interestingly, the mixed matrix membrane demonstrates solution flux as high as 102 L m −2 h −1 with 99.9% rejection of Congo Red under optimized operation conditions in 240 h continuous operation. Taken together, the UiO-66 incorporated NF membranes show strong promise in removing and recovery of dyes in industrial scale.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2017
·Vol. 32
·期 2
·e4049
·
IF 2.319
Xiaowen Tong,Zhiquan Yang,Jinna Feng,Ying Li,Hongguo Zhang
Semiconductor-based photocatalysis is an environmental friendly and cost-effective technique for water treatment. Due to their unique properties, metal–organic frameworks (MOFs) are considered as ideal platform to develop composite photocatalyst. In this study, Bismuth oxychloride (BiOCl) was first attempt to be incorporated with highly stable MOFs, UiO-66(Zr) by hydrothermal reaction. Different characterization methods including X-ray diffraction, Scanning electron microscopy, Fourier transform infrared spectroscope, X-ray photoelectron spectroscopy had been used to prove the successful synthesis of composite photocatalyst. The resultant BiOCl/UiO-66 composite showed higher photodegradation performance of Rhodamine B (RhB) under ultraviolet and visible light irradiation than that of pristine materials and their mechanically mixed sample. In addition, the composite exhibited good structural stability and reusability. The photocatalytic mechanism of RhB degradation over the composite under visible light proceeded via a photosensitization process. A better adsorptivity of RhB and effective electron transfer within the hybrid material might be responsible for the enhanced photocatalytic performance.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Rong Xu,Xin Liu,Chunhui Zhu,Yang Pan,Shixin Cheng,Xiuxiu Ren,Meng Guo,Jing Zhong,Quan Liu,Gongping Liu
A new amine-functionalized UiO-66/organosilica mixed-matrix membrane was fabricated and explored for pervaporation (PV) water desalination . The incorporation of amine-functionalized UiO-66 (UiO-66-NH 2 ) into the BTESE-derived organosilica networks endowed the membrane with enhanced hydrophilicity and dense network structure, leading to an improvement in water flux and NaCl rejection. The UiO-66-NH 2 /BTESE mixed-matrix membrane was proved to be highly effective for desalination of saline water in concentrations from 1 to 13 wt% of dissolved NaCl. Moreover, the membrane exhibited superior structural stability under a continuous PV desalination operation up to 100 h, delivering water permeance of >3.1 × 10 −6 mol m −2 s −1 Pa −1 combined with NaCl rejection of >99.9%. The high water permeance was mainly ascribed to the specific pore structure and the preferential interactions between pore channels and water molecules, and the excellent salt rejection was primarily based on the sieving effect. The proposed UiO-66-NH 2 /BTESE mixed-matrix membranes show great prospects as an alternative for concentrated brine desalination.
研究领域:
材料科学
·
膜分离技术
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环境工程
·
纳米材料
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 10
·6083-6092
·
IF 4.036
Xia Chen,Yongjie Li,Qiang Fu,Hongyun Qin,Junnan Lv,Kun Yang,Qicheng Zhang,Hui Zhang,Ming Wang
The use of large amounts of deleterious solvents in the synthesis of metal–organic frameworks (MOFs) is one of the important factors limiting their application in industry. Herein, we present a detailed study of the synthesis of UiO-66, which was conducted with hydrobromic (HBr) acid as a modulator for the first time, at a high concentration of precursor solution (ZrCl4 and H2BDC, both 0.2 mol L−1). Powder crystals with atypical cuboctahedron structure were obtained which indicated that the HBr acid modulator played roles by competitive coordination and deprotonation modulation, thereby controlling the processes of nucleation and crystal growth. The properties of the obtained materials were systematically characterized and compared with those of materials synthesized with hydrofluoric (HF) acid and hydrochloric (HCl) acid modulators. Despite the high concentration of defectivity, the UiO-66 material synthesized with the HBr acid additive has the characteristics of larger specific surface area, excellent thermal stability and higher porosity in the structure. Besides that, the present protocol has the advantages of high reaction mass efficiency (RME), and feasibility of scalable synthesis, providing a facile and sustainable route to diverse Zr-based MOFs.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Chenling Yao,Huan Zeng,Caiqin Wu,Di Wang,Wenbo Ma,Guilong Li,Jialing Zhou,Jian Wang
Converting the salinity gradient between seawater and river water into osmotic energy is one of the direct and effective ways to alleviate the energy crisis. High selectivity and permeability are two contradictory aspects in the design of composite membranes , and balancing the relationship between the two is the key to achieving efficient osmotic energy harvesting . Herein, a series of heterogeneous membranes consisting of UiO-66-NH 2 intercalated with poly (sodium 4-styrenesulfonate) (PSS) and anodized aluminum oxide (AAO) were designed to enhance the osmosis power generation capacity. The asymmetry of pore size, surface charge, and wettability of the composite membrane makes it behavior like a diodes-like ionic current rectification (ICR). The addition of PSS changes the ion selectivity and permeability of the composite membrane, thus enhancing the energy harvesting performance. The maximum power density of 6.32 W/m 2 is obtained under a 50-fold salinity gradient, which is 4.94 times that of the original composite membrane. This study provides a reasonable preparation strategy for functionalized MOF-based composite membranes for ion transport and efficient osmotic energy conversion.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yubo Li,Ting Wang,Xuan Liu,Lulu Luo,Murong Wang,Weidong Zhang,Dahuan Liu
Recent research efforts have increasingly focused on the synthesis of high-efficiency boron adsorbents, particularly bulk MOFs-based materials rather than powders adsorbents. Herien, a novel GO/UiO-66 aerogel bulk adsorbent was successfully prepared using a facile solvothermal method combined with ascorbic acid thermal reduction. This adsorbent demonstrates effective boron removal from aqueous solutions at 0.08 M boron solution and addresses the challenge of recovering MOFs powders. Consequently, at an initial pH of 10, the adsorption capacity of the GO/UiO-66–4 aerogel reached as high as 81.7 mg/g, and adsorption equilibrium was achieved within 120 min. The pseudo-second-order model effectively described the adsorption kinetics with a correlation coefficient (R 2 ) of 0.9997, suggesting that the adsorption process was chemisorption-dominated. Furthermore, both the Henry and Freundlich models accurately depicted the adsorption isotherm, indicating that the boron adsorption by UiO-66 was a spontaneous endothermic reaction. In addition, the critical limiting factors influencing the adsorption capacity of the adsorbent were investigated. The findings indicated that the active sites on the UiO-66 surface were the predominant factor determining its adsorption capacity. Importantly, this work offers significant insights into the development of bulk MOFs-based adsorbents, as the adsorbent exhibits high boron selectivity and maintains stability over 10 cycles.
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
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Peng Zhang,Yueyang Xu,Konglu Guo,Yan Yin,Jilong Wang,Yongping Zeng
Adsorption desulfurization represents an alternative technology for the effective removal of thiophenic compounds from fuels. Metal−organic frameworks have been the ideal candidates for the adsorptive desulfurization of fuel due to the high surface areas. Pristine UiO-66 is thought to be appropriate for the removal of small thiophenic compounds. This work developed a new type of hierarchical-pore (micro and mesopores) UiO-66 with a higher specific surface area and porosity for the removal of larger adsorbates using MOF-5 as the template. To enhance adsorption desulfurization performance, the Ag + -exchanged hierarchical-pore UiO-66 (HP-UiO-66-SO 3 Ag) with π-complexation was synthesized by the ion-exchange method. The HP-UiO-66-SO 3 Ag samples were characterized by FTIR, XRD, SEM, TEM, and N 2 adsorption–desorption isotherms. Compared with the original UiO-66, the HP-UiO-66-SO 3 Ag has a higher specific surface area, pore volume, and pore size. The static adsorption experiments showed that HP-UiO-66-SO 3 Ag had a high adsorption capacity for thiophene and benzothiophene . Moreover, the HP-UiO-66-SO 3 Ag sample still exhibits high adsorptive performance in the presence of toluene. The regeneration results show that about 90% of the initial adsorption capacity of HP-UiO-66-SO 3 Ag can be regenerated after four cycles.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 7
·3134-3146
·
IF 4.5
Luo Qizhao,Li Jingjing,Yun Panfeng,Qian Libing,Zhang Jinshuai,He Chunqing,Hu Xuejiao,Jiang Haifeng
Desalination through reverse osmosis (RO) membrane is one of the most popular ways. However, conventional RO membranes meet a trade-off between salt rejection and water flux which limit their comprehensive performance. In this work, sulfonated zirconium (IV)-carboxylate metal–organic framework (MOF) material UiO-66-SO 3 H was successfully synthesized, and thin-film nanocomposite (TFN) with UiO-66-SO 3 H-incorporated polyamide (PA) layer was fabricated. Angstrom-sized UiO-66-X ion transport channels with different functional groups in TFN membranes change the membrane morphology and chemistry and accelerate the penetration of water molecules while maintaining the high ion screening effect. As a result, compared to the pristine TFC membrane, the optimized TFN-UiO-66-SO 3 H membrane exhibited an increase in water molecules permeability to 347% and still maintained a salt rejection with ~ 94.7% under 2000 ppm NaCl solution with reverse osmosis (RO) mode, leading to a great improvement of intrinsic separation properties. The improved performance was owing to the size exclusion effect and hydrophilic nature of UiO-66-SO 3 H particles. What is more, the additional water migration channels through the incorporated UiO-66-SO 3 H nanoparticles lead to a boosting water permeation and show optimized performance for desalination. Graphical abstract
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2021
·Vol. 11
·期 9
·693
·
IF 4.106
Fei Guo,Bingzhang Li,Rui Ding,Dongsheng Li,Xiaobin Jiang,Gaohong He,Wu Xiao
Mixing a polymer matrix and nanofiller to prepare a mixed matrix membrane (MMM) is an effective method for enhancing gas separation performance. In this work, a unique UiO-66-decorated halloysite nanotubes composite material (UiO-66@HNT) was successfully synthesized via a solvothermal method and dispersed into the Pebax-1657 matrix to prepare MMMs for CO2/N2separation. A remarkable characteristic of this MMM was that the HNT lumen provided the highway for CO2diffusion due to the unique affinity of UiO-66 for CO2. Simultaneously, the close connection of the UiO-66 layer on the external surface of HNTs created relatively continuous pathways for gas permeation. A suite of microscopy, diffraction, and thermal techniques was used to characterize the morphology and structure of UiO-66@HNT and the membranes. As expected, the embedding UiO-66@HNT composite materials significantly improved the separation performances of the membranes. Impressively, the as-obtained membrane acquired a high CO2permeability of 119.08 Barrer and CO2/N2selectivity of 76.26. Additionally, the presence of UiO-66@HNT conferred good long-term stability and excellent interfacial compatibility on the MMMs. The results demonstrated that the composite filler with fast transport pathways designed in this study was an effective strategy to enhance gas separation performance of MMMs, verifying its application potential in the gas purification industry.Keywords:composite material;UiO-66;HNT;mixed matrix membrane;CO2/N2separation
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Cheng Liu,Huiling Chen,Qi Chen,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of Al 3+ -doped UiO-66(Ce) MOFs (U(Ce x Al 1−x )) was developed to reveal the roles of metal doping on active site formation and substrate activation in photocatalytic selective transformation of amines to imines. Al 3+ doping induced crystal structure distortion to form coordinately unsaturated metal (Al, Ce) sites as Lewis acid sites to chemisorb and activate benzylamine (BA). In situ FTIR revealed that the Al site with stronger acid strength facilitated BA activation. The activation degree of N–H bonds in BA was evaluated by changes of calculated force constant. The intermediate products were confirmed through time-dependent in situ FTIR. The Al 3+ -doped sample U(Ce 0.90 Al 0.10 ), the optimal catalyst, showed a significantly increased BA conversion (97.6 %) than that (47.5 %) of undoped sample, which was attributed to enough active sites and the optimal charge mobility. Finally, the present study proposes a synergistic photocatalytic mechanism associated with molecular activation to demonstrate selective oxidation pathways at the molecular level.
研究领域:
材料科学
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化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 2
·275
·
IF 4.7
Shaojun Chen,Youhan Zeng,Weifeng Bi,Haitao Zhuo,Haiqiang Zhong
The flame-retardancy of polymeric materials has garnered great interest. Most of the flame retardants used in copolymers are functionalized additives, which can deteriorate the intrinsic properties of these materials. As a new type of flame retardant, functionalized metal–organic frameworks (MOFs) can be used in surface coatings of polymers. To reduce the flammability, a mixture of phytic acid, multi-wall carbon nanotubes, zirconium-based MOFs, and UiO-66 was coated on a PC/ABS substrate. The structure of the UiO-66-based flame retardant was established by FT-IR, XRD, XPS, and SEM. The flammable properties of coated PC/ABS materials were assessed by LOI, a vertical combustion test, TGA, CCT, and Raman spectroscopy. The presence of a UiO-66-based coating on the PC/ABS surface resulted in a good flame-retardant performance. Heat release and smoke generation were significantly reduced. Importantly, the structure and mechanical properties of PC/ABS were less impacted by the presence of the flame-retardant coating. Hence, this work presents a new strategy for the development of high-performance PC/ABC materials with both excellent flame-retardancy and good mechanical properties.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4195
·
IF 4.2
Yu Wang,Zhimin Yang,Xichang Wu,Wenxuan Quan,Qi Chen,Anping Wang
In the present study, an acid catalyst (UiO-66-SO3H) with Brønsted and Lewis acid sites was synthesised for the preparation of highly efficient biodiesel from oleic acid and methanol using chlorosulphonic acid sulfonated metal–organic frameworks (UiO-66) prepared with acetic acid as a moderator. The prepared catalysts were characterised using XRD, SEM, FT-IR and BET. The catalytic efficiency of the sulfonated catalysts was significantly improved and successful sulfonation was demonstrated by characterisation techniques. Biodiesel was synthesised by the one-pot method and an 85.0% biodiesel yield was achieved under optimum conditions of the reaction. The esterification reaction was determined to be consistent with a proposed primary reaction and the kinetics of the reaction was investigated. A reusability study of the catalyst (UiO-66-SO3H) was also carried out with good reproducibility. In conclusion, the present study provides some ideas for the synthesis of catalysts with high catalytic activity for the application in the catalytic preparation of biodiesel.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）