CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xianfu Chen,Chaowen Dai,Tianyu Zhang,Peng Xu,Wei Ke,Jian Wu,Minghui Qiu,Kaiyun Fu,Yiqun Fan
Membrane separation has been proven to be a promising technology for waste-oil purification. However, the efficient preparation of hydrophobic and strong membrane materials has always been one of the bottlenecks and the object of research focus in the field. Here, we developed an efficient construction method for preparing a hydrophobic membrane with a robust polytetrafluoroethylene (PTFE) top layer. The macroporous ceramic substrate was applied instead of the ceramic membrane as the support of the PTFE layer. Meanwhile, two-dimensional graphene oxide was introduced to partially pre-fill the large pores on the surface of the substrate. Resultantly, the binding depth between the membrane layer and the substrate was properly tailored. The excessive infiltration of the PTFE membrane layer was avoided, and there was a strong binding between the membrane layer and the ceramic substrate. The effects of the graphene oxide and PTFE loadings and thermal treatment on the microstructure and performance of the composite membrane were systematically studied. The optimized PTFE/alumina composite membrane exhibited a water contact angle of ∼ 135°, an average pore size of ∼ 200 nm, and a layer thickness of 6.5 μm. Additionally, the prepared composite membrane exhibited excellent separation performance for emulsified water and particle suspensions in oil.
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
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Yuanchuan Liao,Nengwen Gao,Qihong Zhao,Xiaoli Wang,Shumin Lin
Thin-film composite (TFC) membranes prepared by interfacial polymerization (IP) have been widely used in wastewater treatment. The substrate pore size plays a critical role on the polyamide (PA) membrane performance. Herein, a variety of PA nanofiltration (NF) membranes on ceramic substrate with different pore size (5 nm (CM-5), 20 nm (CM-20), 50 nm (CM-50), and 200 nm (CM-200)) are successfully prepared via IP. The results depict that substrates with smaller pores have less absorption capacity of the aqueous monomer (piperazine). Reducing ceramic substrate pore size from 200 nm to 5 nm, the formed PA layer transforms from cracked “ridge-and-valley" structure to continuous film. Cross-sectional FESEM images further demonstrate that the PA layer thickness decreases from 106 nm to 29 nm. The pore size of the polyamide membrane on CM-20 is 0.17 nm with a water permeance of 27.3 L m −2 h −1 bar −1 and Na 2 SO 4 rejection of ∼96 %. A smaller pore size of the ceramic substrate might reduce the available space for monomer movement, increasing the collision and reaction between the monomers, which leads to an elevated cross-linking degree of PA (a denser PA layer). Based on the nanofiltration performance, a ceramic substrate with pore size of 20 nm is optimal for the TFC membrane preparation. The obtained membrane keeps stable performance during 72 h operation. The obtained membrane also demonstrates excellent stability in high-temperature environment and in organic solvent. Overall, ceramic substrate with pore size of 20 nm is selected for the preparation of PA NF membrane via IP. The obtained membrane has broad applications in desalination and environmental remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Hui Huang,Xiaowu Chen,Junmin Zhang,Jinshan Yang,Xiangyu Zhang,Yanmei Kan,Yudong Xue,Hao Qin,Xiao You,Shaoming Dong
As the promising candidates for hot section components used in gas turbines , SiC f /SiC composites suffer severe gas steam/melt corrosion, so their long-term stability depends on the surficial environmental barrier coatings . Here, we provide an alternative method to construct the protective structure by thermal diffusion . Firstly, Y-Al diffusants is diffused into the SiC substrate, forming a Y-Al diffusion layer . Then the diffusion layer can transform to a corrosion-resistant Y(Al)Si x O y layer after oxidative treatment. The compositions and morphologies of the as-received diffusion layer and the Y(Al)Si x O y layer were contrasted. Results show that a Y(Al)Si x O y protective layer, which thickens with the extension of oxidative treatment time and the increase of Y/Al ratio, can be formed on the SiC surface. Concentration gradient caused by preferential oxidation of Y-Al prompts the Y-Al diffusing towards surface. Meanwhile, the oxidation of Y-Al makes the Y(Al)Si x O y layer denser and thicker, and finally form the Y(Al)Si x O y protective layer.
研究领域:
材料科学
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表面工程学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Tao Yan,Jianhua Yang,Jinming Lu,Liang Zhou,Yan Zhang,Gaohong He
Due to the poor heterogeneous nucleation properties of MOFs crystal on ceramic substrates resulting from the absence of interaction of MOFs with support substrate surface, it is usually difficult to prepare well-intergrown MOF membranes on substrate by simple in situ growth. In this work, a novel synthesis strategy was used to prepare defect-free ZIF-8 membranes on α-Al 2 O 3 supports by depositing gold particles modified with 2-mercaptoimidazole which creates pseudo-surfaces to bridge the metal centers with support. The end groups of the 2-mercaptoimidazole guides the heterogeneous nuclei to the support surface as homologous-like ligands. Furthermore, investigation of the metal sources revealed that the ZIF-8 membranes prepared with Zn(OAc) 2 as the zinc source possessed more continuous and well-intergrown ZIF-8 membranes with a thickness of about 1 μm compared to other zinc sources. The results of gas separation performance show that the optimized ZIF-8 membranes possess high hydrogen permeance and thermal stability. The gas separation selectivity for binary H 2 /CH 4 mixture reached 20.8 at 150 °C and 1 bar, with a high H 2 permeance of about 6.15 × 10 −7 mol m −2 s −1 Pa −1 , which is promising for hydrogen separation and purification. Moreover, free-organic solvents and room temperature growth by our strategy dramatically reduces the difficulty of preparation and environmental destruction, thus offering a new avenue to prepare MOFs membrane with good separation performance.
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
WATER RESEARCH
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2023
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IF 12.8
Chunyi Sun,Bin Lin,Xiangyong Zheng,Yingchao Dong,Min Zhao,Chuyang Y. Tang
Membrane fouling and scaling are two challenges for efficient treatment of hypersaline wastewater , greatly hindering separation performance and operation stability of desalination membranes. In this work, we report a smooth ceramic-based graphene desalination membrane, exhibiting enhanced anti-fouling and anti-scaling ability and operational performance for efficient treatment of both synthetic and real industrial wastewaters , outperforming polypropylene (PP) membrane. For treatment of hypersaline waters containing organic or inorganic substance , we demonstrate that the graphene membrane exhibits more stable water flux and almost complete salt rejection (>99.9%) during constant operation. Enhanced anti-fouling and desalination performance of graphene membrane could be attributed to the lower attractive interaction force with foulant (−4.65 mJ m –2 ), lower surface roughness ( R a = 2.2 ± 0.1 nm) and higher affinity with water than PP membrane. Furthermore, an anti-scaling mechanism enabled by graphene membrane is evidenced, with a highlight on the roles of smooth graphene surface with lower roughness, less nucleation sites and lower binding force with scaling crystals. Importantly, even for industrial petrochemical wastewater, such a graphene membrane also exhibits relatively more stable water flux and promising oil and ions rejection during long-term operation, outperforming PP membrane. This study further confirms a promising practical application potential of robust ceramic-based graphene membrane for efficient treatment of more challenging hypersaline wastewater with complicated compositions, which is not feasible by conventional desalination membranes.
研究领域:
环境科学
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Peipei Liu,Zhijun Liu,Peng Wu,Xing Ou,Yapeng Zhang,Weizi Cai,Fangyong Yu,Meng Ni,Shuang Cheng,Meilin Liu,Jiang Liu
Nickel oxide (NiO) nanoparticles loaded on porous strontium-substituted lanthanum cobaltite (La 0·7 Sr 0·3 CoO 3-δ , LSC) ceramic substrate is fabricated as a novel binder-free electrode (NiO/LSC) for electrochemical capacitors . The LSC substrate is synthesized through a simple solid-state method. NiO nanoparticles are loaded onto the porous LSC substrate by infiltrating a nickel nitrate (Ni(NO 3 ) 2 ) solution into the pores, followed by calcination . The composite electrode NiO/LSC with a high mass loading of NiO (∼10 mg cm −2 ) exhibits an appreciable areal capacitance of 10.6 F cm −2 , a specific capacitance of 1064.1 F g −1 and remarkable cycling stability (80.1% retention after 3000 cycles at 20 mA cm −2 ). Moreover, an asymmetric electrochemical capacitor, with NiO/LSC as the positive electrode and carbon cloth as the negative electrode , confirms the excellent capacitive properties, with high energy density of 9.27 mWh cm −3 under a wide potential of 1.65 V. This work indicates the promising application of NiO/LSC as an advanced electrode for electrochemical capacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Kui Ma,Naixin Wang,Chengcheng Wang,Quan-Fu An
In recent years, metal-organic framework (MOF) membranes have attracted much attention in many fields. However, the fabrication of MOF membrane with defect-free ultrathin separation layer on the surface of a substrate is very difficult. In this study, freezing assisted in situ growth strategy was used to prepare a nano-confined ZIF-8 composite membrane on a porous ceramic substrate . The frozen alumina substrate with the metal ion ice crystal inside the pores was immersed in ligand solution for the growth of ZIF-8 crystals. Then, ZIF-8 nanoparticles were grown inside the pores rather than on the surface of the substrate. The morphology and structure of the ZIF-8 particles and nano-confined composite membranes were characterized by XRD , SEM, FTIR , EDS, and nanoindentation . The obtained nano-confined ZIF-8 composite membrane exhibited excellent separation performance and stability for removing dyes from water. The influence of preparation conditions on membrane structure and property was also investigated. The freezing assisted method may provide an avenue for preparing MOF membranes in other fields.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Wei Zhou,Pute Wu,Lin Zhang,Shengyu Yao,Delan Zhu,Yaohui Cai
Developing an ultra-thin polyamide selective layer with sufficient mechanical robustness on a highly porous ceramic substrate is challenging for removing heavy metal ions from wastewater. We synthesized a reliable ceramic-polyamide membrane by assembling nanocomposite interlayers of alumina and carbon black on the kaolin substrate. The surface morphology, pore size distribution, and roughness of ceramic substrates were improved by introducing the nanocomposite interlayer. The corresponding optimized water flux , Pb(II), and Cd(II) removal efficiency are 2.75 L m −2 h −1 , 98.44%, and 97.51%, respectively, which are better than those of the polyamide films constructed directly on the ceramic substrate. This facile structure provides more active sites for forming ultrathin polyamide layers with satisfactory mechanical robustness. This paper provides a new perspective for fabricating efficient heavy metal ions filters.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
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