PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Xunke Zhao,Kaihuan Nie,Fuyi Sun,Cheng Xie,Yanran Cheng,Yuanyuan Che
Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m 2 ·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.
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
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 14
·5603-5610
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IF 3.069
Ning Wei,Xudong Zheng,Hongxiang Ou,Peilin Yu,Qiao Li,Shanshan Feng
Metal–organic framework (MOF) materials are a class of hybrid organic–inorganic supramolecular materials. Owing to their highest specific surface area, lowest crystal density and adjustable pore size and functional structure, MOF materials have the potential for some special applications in the field of adsorption of heavy metal contaminants. However, it is difficult to collect and reuse them in adsorption separation because of their nanometer size. Therefore, graphene oxide (GO) with good film-forming properties is used. In this paper, an f-ZIF-8@GO composite membrane material was developed by using GO and a zeolitic imidazolate framework (ZIF-8) material and was modified with 3-aminopropyl-triethoxysilane (APTES) by amine functionalization. After a series of structural characterizations, it was applied to the adsorption of copper ions in water and its adsorption properties were tested. The results showed that the adsorption capacity at pH = 6.0 was the largest, and an increase in temperature was not conducive to the adsorption reaction. The adsorption data were fitted to the Freundlich equation and the quasi-second order kinetic equation. The adsorption of Cu2+ on water was multilayer, and the equilibrium adsorption capacity was up to 1872.24 mg g−1. The prepared materials exhibited high selectivity to copper ions; they could be reused as adsorbents for many times and maintained high adsorption capacity. This kind of material is of great significance for the adsorption and separation of heavy metal ions in water.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
WATER RESEARCH
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2023
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IF 12.8
Fengchun Jia,Liu Yang,Liyue Sun,Dehao Yu,Yu Song,Yanxin Wang,Matt J. Kipper,Jianguo Tang,Linjun Huang
Two-dimensional materials are widely used in membrane separation, but the loose distribution and severe expansion between graphene oxide (GO) nanosheets limit its application. Here, we introduce a two-dimensional MOF material into the GO membrane to enhance its water permeance and separation performance. The MOF/GO composite membrane was prepared by vacuum filtration. The MOF and GO nanosheets were tightly stacked through the π-π effect, and the shortened transmission path and enhanced pore structure greatly improved the water permeance of the composite membrane. The MOF/GO membrane exhibited a high water permeance of 56.94 L m −2 h −1 bar −1 . The rejection rates of methylene blue and was as methyl orange dyes were as high as 99.79% and 99.11%, respectively. At increased dye concentration, the rejection rate of methylene blue was still maintained greater than 99%. Dye rejection after 18 h of continuous operation remains above 90%. This work provides new ideas for improving membrane separation materials. The combination of two-dimensional heterogeneous materials can result in synergistic advantages for the development of composite membranes with high water permeance and high rejection rate.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
PubMed
高影响因子
International Journal of Environmental Research
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2024
·Vol. 19
·期 1
·1-13
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IF 2.6
Liu Liao,Ren Chunji,Zhang Wuhuan,Fan Meikun,Zhang Jianqiang
The printing and dyeing wastewater has high chromaticity, biorefractory properties, and significant toxicity. In this study, PVDF-PVA/GO was synthesized for dyes’ adsorption with various chemical properties. Incorporating graphene oxide (GO) into the composite substantially enhanced the hydrophilicity and electronegativity of the PVDF membrane. Results indicated that the adsorption efficiencies for rhodamine B (RhB) and methylene blue (MB) are higher than those of methyl orange (MO) and bromocresol green (BCG). At an initial pH of 8, the maximum adsorption capacities for RhB and MB were 11.81 and 9.25 mg/g, respectively, while MO and BCG indicated considerably lower capacities of 0.59 and 0.63 mg/g, respectively. The cyclic utilization of the PVDF-PVA/GO revealed minimal degradation in adsorption efficiency. The adsorption kinetics of the four dyes primarily follow intra-particle diffusion mechanisms, resulting in the binding of dye molecules to the PVDF-PVA/GO membrane through electrostatic interactions. Notably, competitive adsorption phenomena were observed in mixed dye systems, especially between RhB and MB. Comparative analyses indicated an increased adsorption capacity for MB in the mixed dye system, accompanied by a notable reduction in the adsorption capacity of RhB. This study provides a theoretical foundation for the remediation of printing and dyeing wastewater. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jiuyun Cui,Atian Xie,Zhuo Yan,Yongsheng Yan
Although a great deal of superhydrophilic/underwater superoleophobic membranes has been developing for oil-water emulsion separation, most of them could be destroyed or lose their underwater superoleophobicity after exposure to complex conditions. In this study, a crosslinking modified PVDF/GO membrane with acid, alkali and high salt resistance was successfully prepared by a simple crosslinking process between acrylic acid and ethylene glycol dimethacrylate (EGDMA). The influences of content of acrylic acid on the membrane performance and structure evolution were investigated. The resultant composite membrane showed superior underwater superoleophobicity even in acid, alkali and salt environments. Additionally, the composite membrane could effectively separate various surfactant-stabilize emulsions under gravity-driven via wettability capillary effect with high rejection (>99%) and flux (>145 L m −2 h −1 ). The composite membrane also exhibited outstanding recyclability because of the stable covalent bridged multiple networks structure. The antifouling performance, stability and impressive recyclability make the composite membrane a promising candidate for long-term oil-water emulsion treatment.
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
DESALINATION
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2025
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IF 9.8
Yilin Wu,Yanke Xu,Faguang Ma,Jingjing Zhen,Yue Li,Fanlei Kong,Ming Yan
In this study, modified hollow e-ZIF-8 nanoparticles with a hollow structure and hydroxyl-rich surface were ingeniously synthesized through a one-step etching method, thereby increasing the contact area and addressing the issue of stacking imprinting sites, fundamentally enhancing selectivity. Among these, the hollow structure of the e-ZIF-8 nanoparticles not only increased the interlayer spacing of the graphene oxide (GO) nanosheets, providing additional pathways for water molecules, but also, through π-π interactions, cross-linked the phenol-modified nanoporous metal-organic frameworks (MOFs) with the GO nanosheets, significantly enhancing the structural stability and anti-fouling capability of the composite membrane. The effects of different e-ZIF-8 addition amounts on membrane flux and hydrophilicity were investigated, constructing a GO-based imprinting structure on the stacked e-ZIF-8/GO nanosheet surfaces, offering a novel strategy to improve the selectivity and stability of the membrane. The maximum adsorption capacity of e-MG-IMs reached 38.35 mg g −1 , demonstrating good selective separation factors ( α RBV/ACV = 3.24, α RBV/AZT = 2.41 and α RBV/LAM = 4.21), as well as excellent permeation selectivity ( β ACV/RBV = 4.75, β AZT/RBV = 4.42 and β LAM/RBV = 5.92). In this study, the optimized regulation of GO nanosheets extended the molecular transport channels, facilitating the construction of more molecular recognition sites, thus positively impacting the separation performance of the imprinting membrane.
研究领域:
材料科学
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药物分离工程
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Xianfeng Ou,Xiaohan Yang,Jingqi Zheng,Mingxian Liu
Chitin nanocrystals modified by dopamine (D-ChNCs)/graphene oxide (GO) composite membranes were successfully prepared with the assistance of vacuum filtration. D-ChNCs/GO was analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to characterize the surface morphology of the membrane. The hydrophilicity of membrane is dependent on the content of the hydrophilic D-ChNCs, which shows a sharp increase of pure water flux from 8.8 of pure GO to 135.6 L·m–2·h–1. The rejection ratio of methylene blue (MB) and Congo red (CR) is as high as 99.3 and 98.3%, respectively. In addition, the oil rejection ratio of the membrane is above 97.5%, exhibiting good oleophobicity. The recycle experiment also demonstrates acceptable recyclability and proper regeneration for practical application. In total, D-ChNCs/GO composite membranes with excellent hydrophilicity, good oleophobicity, and anti-dye and anti-oil fouling have great potential in wastewater treatment.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Kexin Tao,Yuning Zhang,Yu Song,Zhiyuan Chen,Yao Wang,Yanxin Wang,Jianguo Tang,Linjun Huang
Water pollution has long been a significant issue, and the purification of dye wastewater plays a crucial role in addressing this problem. Graphene oxide (GO) has found extensive applications in water treatment due to its unique two-dimensional (2D) structure and a surface rich in a large number of oxygen-containing functional groups. We introduced silica(SiO 2 ) and polyethyleneimine(PEI) into GO to prepare a membrane. The experimental findings revealed that the 3-SiO 2 /GO binary composite membrane achieved a high water permeability of 45.6 L m −2 h −1 bar −1 while maintaining retention, which is nearly four times higher than that of the GO membrane (9.85 L m −2 h −1 bar −1 ).The water permeability of the PEI 0.2 -SiO 2 /GO ternary composite membrane achieved 42.37 L m −2 h −1 bar −1 . The rejection rate for methyl orange dye reached 92.36 %, with similar rejection rates all above 95 % observed for other dyes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Lin Zhang,Ying Lu,Ying-Ling Liu,Ming Li,Hai-Yang Zhao,Li-An Hou
Graphene oxide (GO)-based membranes provide an encouraging opportunity to support high separation efficiency for wastewater treatment. However, due to the relatively weak interaction between GO nanosheets, it is difficult for bare GO-based membranes to survive in cross-flow filtration. In addition, the permeation flux of the bare GO membrane is not high sufficiently due to its narrow interlayer spacing. In this study, GO membranes interlinked with multi-walled carbon nanotubes (MWCNTs) via covalent bonds were fabricated on modified polyacrylonitrile (PAN) supports by vacuum filtration. Due to the strong bonds between GO, MWCNTs and the PAN membrane, the membranes could be used for the treatment of simulated nuclear wastewater containing strontium via a cross-flow process. The result showed a high flux of 210.7 L/(m 2 h) at 0.4 MPa, which was approximately 4 times higher than that of commercial nanofiltration membranes. The improved water permeation was attributed to the nanochannels created by the interlinked MWCNTs in the GO layers. In addition, the hybrid membrane exhibited a high rejection of 93.4% for EDTA-chelated Sr 2+ in an alkaline solution, and could also be used to separate Na + /Sr 2+ mixtures. These results indicate that the MWCNTs-interlinked GO membrane has promising prospects for application in radioactive waste treatment.
研究领域:
环境科学
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材料科学
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废水处理
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纳米技术
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
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IF 5.6
Xishun Peng,Qixin chen,Xinghua Li,Li Yang,Yiheng Yuan,Cheng Zuo,Zhangyu Zhou,Zhongchen Bai
Crystal violet (CV) residues in Marine food have produced a severe health threat in human life. In this study, we proposed a semiconductor surface-enhanced Raman scattering (SERS) sensor of corrosion-resistant Polyaniline/Graphene oxide (PPy/GO) film by electrochemical growth method to detect CV residues in fresh fish tissue. A PPy/GO dispersion solution was one-step deposited on a stainless steel sheet surface by electrochemical polymerization process to form a PPy/GO composite film acting as a semiconductor SERS substrate. Since the substrate of PPy/GO film was mainly composed of GO sheet without other metals, it had a good corrosion resistance. The SERS enhancement factor and charge transfer intensity P CT of PPy/Go SERS substrate for CV molecules were up to 1.18 × 10 6 and 0.903, respectively. Furthermore, the limit of detection ( LOD ) of PPy/GO SERS substrate could reach 1.58 nM. In addition, SERS sensor of PPy/GO film could identify CV residues in fresh fish tissues, and its recovery rate was 91.8 %–107 %. This preparing method and detecting method we proposed PPy/GO SERS substrate provide a new pathway for detecting CV residues in Marine food.
研究领域:
材料科学
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分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xia Zhan,Rui Ge,Teng Huo,Juan Lu,Jiding Li
Graphene oxide (GO) membranes exhibit ultrafast water permeation properties, which have been employed in various membrane-based separations including nanofiltration for dye removal from textile wastewater. However, it’s still a great challenge to achieve precise control over the microstructure of GO membranes and obtain ultrathin GO membranes with exceptional separation efficiency and robust membrane structure. Herein, in-situ confined interfacial polymerization (IP) is proposed for fabricating loose polyamide (PA)@GO hybrid membranes with high permeance and dye rejection as well as robust membrane stability. A new diamine of sulfadiazine (SA) with intrinsic hydrophilic and conjugated sulfonamide groups is employed as cross-linker of GO membranes and monomer of PA in IP process, simultaneously. PA is in-situ synthesized in confined GO interlayer via IP process and intercalated into GO interlayer, which enlarges the interlayer spacing of GO membranes gradiently. The combination of hydrophilic PA nanofiltration layer on GO membrane surface and the PA intercalated GO membrane with varying interlayer spacing creates hierarchical transport channels for water molecules, which contributes to the high water permeance. Moreover, the less reactive SA monomer endows PA@GO selective layer with appropriate negative charge and loose transport channels, which contributes to both of high permeance and dye rejection due to Donnon effect and size exclusion effect. The PA@GO hybrid membrane exhibits high permeance of 75.5 L/(m 2 ·h·bar) with TB dye rejection of 99.8 %, and exhibits low NaCl rejection of 11.6 %. Moreover, PA@GO hybrid membrane shows good fouling resistance and long-term stability as well as stable separation performance under harsh conditions. Both of high permeance and dye rejection of PA@GO hybrid membrane suggests that the integration of PA nanofiltration layer and GO membrane via in-situ confined interfacial polymerization can achieve the delicate control over the interlayer channel structure and the physicochemical properties of the membrane surface of GO membranes, which offers a promising method to break through the trade-off effect between permeability and selectivity of GO membranes.
研究领域:
材料科学
·
环境工程
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膜技术
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水处理
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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）