INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhipeng Deng,Kun Lv,Gang Zhu,Xuezhi Zhao,Yujun Feng
Efficient separation of oil–water mixtures, particularly homogeneous and stable emulsions, has always been an industrial challenge. Herein, we report a facile, cost-effective procedure for fabricating superhydrophobic melamine sponges using a single solution–immersion process. The modified sponge has stable superhydrophobicity owing to the synergy of triple hydrophobic mechanisms with a maximum water contact angle of 158°. As an absorbent, the modified sponge block exhibits high porosity, outstanding absorption capacity, excellent mechanical properties, and superior physical and chemical stability, enabling its use for the separation of stratified oil–water mixtures via repeated absorption–extrusion processes with a separation efficiency of nearly 100%. Furthermore, as a filter, the crushed, modified sponge powders exhibit a demulsification efficiency ranging from 97.65 to 99.33% for the separation of ideal water-in-oil emulsions under gravity. Finally, the feasibility of these sponges for oilfield applications is established through the demonstration of the continuous separation of an emulsion of brine in crude oil using the modified sponge powders in conjunction with an in-house built apparatus. This work may open a viable pathway for the efficient separation of both stratified and emulsified oil–water mixtures via wettability, and provide a novel strategy for the reuse of waste sponges.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 35
·e54357
·
IF 3
Junhuang Xu,Hongqiang Li,Longzhu Zheng,Shangdong Huang,Weizhen Fang,Xuejun Lai,Xingrong Zeng
With the increasing deterioration of environmental and ecology caused by industrial wastewater pollution and petroleum spill accidents, superhydrophobic materials for oil–water separation have attracted considerable attention. Herein, we propose a facile approach to fabricate fluorine-free superhydrophobic cotton fabric (CF) for oil–water separation after the coverage of chitosan (CS) and titanium dioxide (TiO 2 ) nanoparticles and the subsequent hydrophobization modification by hexadecyltrimethoxysilane (HDTMS). The obtained HDTMS-TiO 2 /CS@CF showed superhydrophobicity with a high water contact angle of 160.6° as well as excellent self-cleaning capability, non-adhesion capability and surface stability. Moreover, the CF was successfully applied for the separation of various oil–water mixtures. The separation efficiency for trichloromethane-water mixture reached 95.8%, and still maintained 95.6% after 30 separation cycles. In addition, the CF also possessed superior photocatalytic degradation capability for organic contaminant such as oil red O and the degradation rate was 86.2% under UV irradiation for 180 min. The preparation method in this work is simple, environmentally friendly, low-cost, and easy to produce on a large scale. The findings conceivably stand out as a new method to fabricate superhydrophobic materials and show great application potential in the fields of oil–water separation and water purification.
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JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 21
·2733-2741
·
IF 3.4
Houying Ma,Yuling Yang,Jianqiang Wang,Zhixiang Zeng,Lijing Zhu
Oil-fouling of the membranes limits further application in the separation and purification of oil-in-water emulsions. Here, anti-oil fouling membranes are engineered by the method of non-solvent induced phase separation (NIPS) which enriches the polysulfonated dopamine (PSDA) and polyethyleneimine (PEI) (PSDA-PEI) to the top surface from mixed casting solution. The obtained membrane achieves excellent anti-oil fouling property as high as 98.2% oil rejection, yet it still possesses good flux of 2362.5 ± 110.9 and 1252.3 ± 71.8 L m −2 h −1 for the separation of 1,2-dichloroethane-in-water and toluene-in-water emulsions. This can be attributed to outstanding hydrophilicity and super underwater superoleophobicity for mussel-inspired PSDA-PEI layer. In addition, the membrane also has excellent stability in acid (pH 1, 3, and 5) or alkali (pH 10 and 12) solutions. This work provides a facile method to engineer underwater superoleophobic membranes with excellent anti-oil fouling by mussel-inspired chemistry for oily water treatment. Graphical
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ChemistrySelect
·
2023
·Vol. 8
·期 29
·e202300694
·
IF 2.1
Haitao Meng,Xuecong Pan,Xuemei Li,Haijun Meng,Shouzhu Li
Graphical An efficient and durable hydrophilic SiO 2 fiber membrane was designed by a template-free strategy combined with electrostatic spinning technology. The material can perform separation of oily wastewater under gravity-only conditions and has demonstrated high separation performance for effective separation of oil-water mixtures and oil-in-water (O/W) emulsions. The discharge of oily wastewater seriously affects human health and the sustainable development of the ecological environment. Therefore, developing oil-water separation materials capable of removing organic pollutants is imperative. In this study, we report the preparation of a SiO 2 nanofiber membrane based on tetraethyl orthosilicate (TEOS) using a template-free strategy combined with electrostatic spinning technology. The prepared SiO 2 nanofiber membrane was characterized using SEM, EDX, FT-IR, AFM, XRD, CA, and TG techniques. The prepared SiO 2 nanofiber membranes exhibit excellent hydrophilicity (WCA=0°) in air and oleophobicity (UWOCA=136°) underwater, with excellent anti-pollution properties for gravity-driven oil-water separation. The SiO 2 nanofiber membrane can effectively separate different kinds of oil-water mixtures with high water flux (4420 L m −2 h −1 ) and excellent separation efficiency (99.1 %), with a flux loss of 5.65 % after ten cycles, indicating excellent cycling stability. In addition, it can also be used to separate various oil-in-water emulsions stabilized by surfactants with a separation flux higher than 2079 L m −2 h −1 and a separation efficiency maintained at more than 97 %. During the separation of 150 mL lotion, the membrane was seriously scaled due to long-term pollution. Simple water washing could not restore the membrane flux, and the irreversible scaling rate was 50.74 %, which seriously affected the continuous separation. However, due to the excellent thermal stability of SiO 2 nanofiber membranes, oil contaminated membranes can be heated and regenerated, resulting in a flux recovery rate of nearly 100 %. Overall, this material has a wide range of potential applications in environmental protection, especially in the treatment of oily wastewater, due to its simple fabrication method, high flux, and superb oil resistance and recyclability.
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MOLECULAR PHARMACEUTICS
·
2023
·
IF 4.9
Qingfa Tang,Yao Chen,Yusheng Zhang,Kewei Wang,Li Liu,Dongmei Pan,Qiang Liu,Cuiping Jiang
Tanshinone IIA (TS-IIA) and salvianic acid A (SAA) are the main pharmacological active constituents of Danshen, which exhibit potent effects on atherosclerosis. A combination of TS-IIA and SAA might exert a synergistic antiatherosclerotic effect. However, the opposite solubility profiles of TS-IIA and SAA might lead to difficulty in achieving a synergistic combined effect of the two active components. Therefore, in this work, we fabricated a ROS-responsive prodrug micelle for the codelivery of TS-IIA and SAA (TS-IIA-PM) by self-assembling amphiphilic block copolymer PEG5000-SAA/PLA10000-APBA. The amphiphilic polymer was characterized by 1H NMR, FTIR, and alizarin red S competition tests. The ROS responsiveness of TS-IIA-PM was evidenced by time-course monitoring of particle size and morphology changes and drug release behavior in the presence of 1 mM H2O2. We found TS-IIA-PM was stable according to its critical micelle concentration and the unchanged particle sizes in 10% FBS for 7 days. The results of in vitro and in vivo tests revealed that TS-IIA-PM was safe and biocompatible. Furthermore, it was observed that TS-IIA and prodrug micelle could produce synergistic antiatherosclerotic effect based on the results of the antioxidant study, which was further confirmed by a series of pharmocodynamics studies, such as in vitro DiI-oxLDL uptake study, oil red O staining, cholesterol efflux study, inflammatory cytokine analysis, in vivo CD68 immunostaining, and lipid disposition staining studies. Collectively, TS-IIA-PM holds great potential for the safe and efficient codelivery of TS-IIA and SAA for synergistic antiatherosclerosis.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Fuying Pei,Hongge Jia,Shuangping Xu,Mingyu Zhang,Yanqing Qu
Membrane separation is considered an effective technology for treating oily wastewater. Hydrophilic, underwater oleophobic water removal membranes prepared by electrostatic spinning have received significant attention due to their excellent antifouling properties, small pore blockage, and high permeation flux. Herein, a simple and effective method was proposed for fabricating fabrics with superhydrophilic and submerged superoleophobic properties. First, the materials were co-blended with sodium dodecyl benzene sulfonate by electrostatic spinning, and then the porous fiber membrane was obtained by a step-up temperature for thermal imidization. The obtained membranes showed superhydrophilic and underwater oleophobic properties and could separate oil–water emulsions with or without surfactant stabilization while also exhibiting certain retention of methylene blue dye. The separation efficiency was driven by gravity alone, and the oil–water separation efficiency was always above 98.5% for 10 separation cycles, with a separation flux of up to 700 L·m −2 ·h −1 . The modified membranes were tested and evaluated for various oil–water emulsions, and the separation efficiency was found to be consistently above 98.5%. In addition, the membranes showed satisfactory mechanical strength, high-temperature resistance, and excellent contamination resistance, suggesting that these membranes could serve as promising candidates for the treatment of industrial oil-in-water emulsions.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yeye Liu,Leilei Zhang,Fei Zhao,Chang Li,Hongchao Sheng,Hejun Li
Paper with simultaneous fire-resistance and hydrophobicity have greatly potential applications in the fields of packing, storage and delivering information, which attracts increasing attention recently. Different from the traditional cellulose-based paper which is extremely easily damaged by water and fire, a new type of highly flexible, fire-resistant and hydrophobic paper based on Si 3 N 4 nanowires and polydimethylsiloxane (PDMS) is reported. Specially, the Si 3 N 4 @PDMS core-shell nanowires with 3D interlocking structure are designed, in which the Si 3 N 4 nanowires act as the inorganic fire-resistant frameworks and the PDMS shell with low surface energy provides the hydrophobic surface . The Si 3 N 4 @PDMS core-shell nanowires are intertwined and interlaced to form a highly flexible Si 3 N 4 @PDMS paper. The tensile strength of Si 3 N 4 @PDMS paper is 6.19 MPa, indicating the good mechanical property. The obtained Si 3 N 4 @PDMS paper has the characteristics of writability, fire-resistance and hydrophobicity. The high thermal stability of Si 3 N 4 nanowires makes Si 3 N 4 @PDMS paper exhibit excellent fire resistance. No obvious change is observed for the commercial paper with Si 3 N 4 @PDMS paper as the fire-shielding layer after heating for 30 min. In addition, the contact angles of water droplets are all greater than 110° over the surfaces of Si 3 N 4 @PDMS paper after mechanical damages, chemical corrosions and thermal treatments. Si 3 N 4 @PDMS paper can be used in oil/water separation and oil collection. More importantly, Si 3 N 4 @PDMS paper can be used for writing without being damaged by fire or water. The present work may inspire the development and application of functional paper and is expected to become a breakthrough in the traditional paper industry.
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Jingyu Li,Yanbin Meng,Jiao Liu,Fang Yu,Xiang Wang,Ting Wang,Kun Gao,Zhao Zhang
Antibacterial superamphiphilic materials with green and facile preparation process have attracted extensive attention in oil/water separation. Herein, an antibacterial waterborne polyacrylate (AWBPA) composed of [2-(methacryloyloxy)-ethyl] trimethylammonium chloride (METAC) and basic acrylate monomers has been successfully developed using the emulsion polymerization method and water as the sole solvent. By sequentially simple dip-coating of polyethyleneimine (PEI) and AWBPA, the polyester fabric can be endowed with the superamphiphilic and antibacterial properties. By prewetting with water/oil, the modified fabric holds underwater superoleophobicity/underoil superhydrophobicity, and can be used for continuous separation of light oil/water, heavy oil/water and light oil/water/heavy oil mixtures. Importantly, these modified fabrics have high antibacterial activity (99.3 ± 0.2 %), and can maintain its underwater superoleophobicity and underoil superhydrophobicity even after immersion in corrosive solution for 15 d, 100 g sand impact and 200-cycle adhesive tape-peeling, and are suitable for practical large-scale production applications.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 8
·20006-20019
·
IF 5.19
Lin Qinghua,Hong Mei
Fractional wettability is common in the dense non-aqueous phase liquids (DNAPL) contaminated sites. However, it is still unclear how fractional wettability affects surfactant-enhanced DNAPL immiscible mobilization in saturated porous media. The macro-contact angle of the fractional wettability media was measured. The results of column experiments showed that the entrapped tetrachloroethene (PCE) saturations after sodium dodecyl benzene sulfonate (SDBS) flooding were lower in the media where NAPL-wet sand was present compared with those in water-wet media. In the media which contained 25% octadecyltrichlorosilane (OTS)-treated sand, the entrapped PCE saturations decreased to the minimum, and the decrease was much larger in fine sand media. The SDBS-enhanced PCE recoveries were jointly affected by fractional wettability, particle size, and interfacial tension (IFT). When NAPL-wet sand was present and SDBS concentration was just 0.125 g⋅L −1 , the SDBS-enhanced PCE recoveries increased significantly. As the SDBS concentration continues to increase to 0.5 g⋅L −1 , they only increased slightly. In the fine sand media, the SDBS-enhanced PCE recoveries were higher, and they increased more obviously with the increase of NAPL-wet sand fractions. The influence weight of fractional wettability on SDBS-enhanced PCE recoveries was the largest (47.09%) under the experimental conditions. These findings indicate that it is important to consider fractional wettability characteristics when establishing a DNAPL immiscible mobilization strategy, because it is not sufficient to consider only IFT reduction, especially in media with finer pore structures.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Liyi Zhang,Yongcong Liu,Guangyong Zeng,Zhaomei Yang,Qingquan Lin,Yanyong Wang,Xiaoguang Wang,Shengyan Pu
MXene-based two-dimensional (2D) material membranes have attracted an increasing number of attentions in the field of separation and purification. However, the easily oil-pollution of MXene membrane still limit its further application for oil/water separation. In this work, Na-Bentonite was embedded into MXene nanosheets and then a series of Na-Bentonite@MXene (NBM) composite membranes were prepared by one-step hydrothermal pretreatment and vacuum self-assembly on polyvinylidene fluoride membrane surface. The modified composite membranes exhibited excellent separation performances with a rejection ratio above 96 % and a flux recovery rate (FRR) higher than 86 % after 8 cycling tests for oil/water emulsion. In addition, the sandwich structure consisting of MXene nanosheets and Na-Bentonite could not only play a positive role in the stability of composite membrane, but also formed a special micro-nano structure on membrane surface, resulting in a switchable wettability of composite membrane. When the membrane surface was pretreated with water or oil, it presented hydrophilic/hydrophobic or hydrophobic/oleophilic surfaces, respectively, which realized the effective separation for different components in oil/water emulsion. This work provides a new method for the design and construction of MXene-based 2D membrane with continuous anti-fouling capacity, which shows a great application potential in the treatment of oily wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Huanjie Chi,Hui Cao,Zhiguang Xu,Tao Zhang,Jing Yu,Yan Zhao
The anti-oil-fouling property of cross-linked poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) was investigated by testing not only the under-oil superhydrophilicity but also the dewetting ability of oil that adheres on PDMAEMA coating surface . Different to other common hydrophilic polymers (e.g., polyacrylamide (PAM) and poly(methacrylic acid) (PMAA)), PDMAEMA coating shows the unique under-oil superhydrophilicity (wetting time <3 s for a 6 μL water drop), and even more interestingly, the oil that adheres on dry PDMAEMA coating surface can spontaneously dewet and detach off from the surface when immersed in water. The PDMAEMA coating shows lower surface energy ( γ s ) (53.3 mN m −1 ) than PAM and PMAA (70.5 and 61.1 mN m −1 , respectively) and moderate zeta potential (69 mV; 29 and −148 mV for PAM and PMAA, respectively), while it has much higher moisture absorption rate (∼16%) than PAM (∼6%) and PMAA (∼3%) coatings. The overall test results suggest that PDMAEMA coating has stronger hydration ability than PAM and PMAA coatings, and meanwhile, the hydrated water molecules in the coating can weaken the interaction of the PDMAEMA with oil, thus inducing the under-oil superhydrophilicity. Moreover, it is demonstrated that dry PDMAEMA coating can capture water drops from bulk oil, and thus the PDMAEMA coating can be utilized to prepare filtration membrane for the separation of surfactant-stabilized water-in-oil emulsions with high separation efficiency (>99.0%) and long-lasting stability.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jialong Wu,Xiaozhen Ma,Pitchaimari Gnanasekar,Fan Wang,Jin Zhu,Ning Yan,Jing Chen
Superhydrophobic polyurethane foam is one of the most promising materials for oil-water separation. However, there are only limited studies prepared matrix superhydrophobic foams as adsorbents. In this paper, SiO 2 modified by 1H, 1H, 2H, 2H-perfluorododecyl trichlorosilane (F-SiO 2 ) was added into the lignin-based foam matrix by a one-step foaming technique. The average diameter of F-SiO 2 was about 480 nm with an water contact angle (WCA) of 160.3°. The lignin-based polyurethane foam with F-SiO 2 had a superhydrophobic water contact angle of 151.3°. There is no obvious change in contact angle after 100 cycles of compression or after cutting and abrasion. Scanning electron microscopy (SEM) analysis showed that F-SiO 2 was distributed both on the surface and inside of the foam. The efficiency for oil-water separation reached 99 %. Under the light intensity of 1 kW/m 2 , the surface temperature of the lignin-based foam rose to 77.6 °C. In addition, the foam exhibited self-cleaning properties and degraded within 2 h in an alcoholic alkali solution. Thus, in this study, we developed a novel matrix superhydrophobic lignin-based polyurethane foam with an excellent promise to be used as oil water separation adsorbents in industrial wastewater treatment and oil spill clean-up processes.
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高影响因子
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