JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Wenjing Ma,Juntao Zhao,Olayinka Oderinde,Jingquan Han,Zhongche Liu,Buhong Gao,Ranhua Xiong,Qilu Zhang,Shaohua Jiang,Chaobo Huang
Marine pollution and industrial wastewater have caused serious environmental pollution, thereby resulting into an alarming damage to public health in the past decades, hence the high demand for, cost effective, energy-efficient oil-water separation technologies for the removal of oil contaminants from such water. Herein, we report a facile method to fabricate superhydrophobic/superoleophilic membrane by immersing a polyimide (PI)-based nanofibrous membrane into a water/ethanol/ammonia/dopamine mixture, followed by modification with 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT). The PI-based membrane exhibited water contact angle (WCA) above 153°, while the oil contact angle (OCA) approached 0°, thereby promoting an outstanding chemical stability which sustained its superhydrophobicity when immersed in aqueous solutions at different pH values. Additionally, the PI-based membrane possesses ultrahigh flux, high separation efficiency and good reusability in oil-water separation. The aforementioned properties, as well as the easily scale-up preparation process ensure that this promising as-fabricated membrane can be applied for practical environmental applications including treatment of oily wastewater and oil spillage clean-up.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Tianlong Yu,Shixiang Lu,Wenguo Xu
The coral-like bismuth coated iron mesh (BCIM) was fabricated via chemical etching, immersion replacement and anneal. The resulting sample exhibited remarkable superhydrophobic/superoleophilic property with water contact angle of 163° and oil contact angle almost 0°. Visually, the water and hexane droplet could separately roll off and penetrate into the BCIM surface. Various oil-water (hexane, benzene, toluene, kerosene, bean oil, chloroform, tetrachloride, and water) separations were performed to investigate the separating performance. The initial separation efficiency of hexane-water reached 98.7% and it could maintain over 96% after 20 runs. The BCIM could also act as a scavenger to eliminate the floating or underwater oil. Moreover, it exhibited marvel buoyancy, desired stability and wear resistance.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Zhigao Zhu,Zheyu Li,Lingling Zhong,Ruijun Zhang,Fuyi Cui,Wei Wang
Developing a feasible and cost-effective membrane which can remediate highly emulsified oily water, especially those stabilized by surfactants , is of great significance but challenging. In this work, a biomimetic superwetting silica nanofibrous membrane (SNFM) with hierarchical structures, interconnected pores as well as high porosity was developed by the facile combination of electrospinning and a dual-bioinspired method. Bioinspired adhesive (polydopamine/polyethylenimine, PDA/PEI) with positively charged active sites was first linked onto silica nanofiber (SNF) surface via Michael addition reaction and then the membrane roughness was constructed by assembling the negatively charged silica nanoparticles (SNPs) via electrostatic attraction. The resultant membrane exhibits a superwetting performance with a water contact angle of 0° in air and an oil contact angle of 165 ± 3° underwater. Moreover, the hierarchically structured SNFM displays strong acid/alkali resistance, outstanding thermal stability, robust flexibility and high mechanical strength . As a poof-of-concept, the hierarchical SNFM integrated into a wastewater separation tank achieves a high water flux over 7152 and 1120 L m −2 h −1 when treating oil-in-water microemulsion (1000 mg L −1 ) with and without surfactant, respectively. The dual-bioinspired method can be used as a universal tool to construct material surface roughness for application in other selective separation fields.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Liming Liu,Yunlu Pan,Bharat Bhushan,Xuezeng Zhao
Hypothesis Research on the fabrication of superwettable adsorbents based on 3D porous materials has been attracting considerable attention due to the large storage space presented in their inner bodies. However, it is rare to present a facile, eco-friendly and ultralow-cost approach to modify the 3D porous materials with magnetism thereby obtaining a remotely controllable superhydrophobic/superoleophilic material. Experiments Based on this, the 3D magnetic superhydrophobic porous materials (MSPM) based on adsorbent cotton and sponge as substrates were fabricated by a simple dip-coating method using non-hazardous chemical reagents as raw materials. Changes in pristine materials’ wettability during the fabrication process were illustrated gradually by SEM micrographs and XPS characterization. Findings The prepared 3D MSPM exhibits fast magnetic responsivity while the superwettable property of water contact angle reached to 162°, and demonstrated oil/water separation and demulsification with excellent adsorption capacity, high separation efficiency and good reusability. Moreover, the 3D MSPM maintains the superhydrophobicity even if compressed with 50% strain for 200 cycles, or immersed in a harsh chemical environment for more than 3 days. As a result, all these features make the as-prepared 3D MSPM possess a large range of applications in contaminated oil recovery.
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DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Ting Zheng,Zhenyu Wu,Qinglong Xie,Jiaojiao Fang,Yunchen Hu,Meizhen Lu,Fan Xia,Yong Nie,Jianbing Ji
Most of the plasticizers used during poly (vinyl chloride) processing are typically toxic petroleum-based phthalates . Furthermore, large amount of edible oils become waste all over the world, fortunately, waste cooking oils have the potential to be an economic alternative for synthesizing different biomaterials. This study aimed to synthesis an improved properties and cost competitiveness cleaner bio-plasticizer using waste cooking oil methyl esters as staring raw materials. In this paper, waste cooking oil methyl esters were structurally modified i.e., transesterification and epoxidation reaction, to prepare epoxide waste cooking oil 2-ethylhexyl esters. The in-situ epoxidation was mainly studied by response surface methodology , with optimum conditions: reaction time was 7 h, molar ratio of C C bonds/FA/H 2 O 2 was 1.00/0.35/2.41, and reaction temperature was 65.84 °C with a maximum relative percentage conversion to oxirane of 92%. Also, the plasticizing effectiveness of epoxide waste cooking oil 2-ethylhexyl esters to substitute toxic plasticizer dioctyl phthalate were studied. Results showed that the mechanical and thermal performance of PVC samples was significantly improved with partial substitutions, while the migration resistance was slightly decreased. Comparison with conventional epoxy compound highlighted that epoxide waste cooking oil 2-ethylhexyl esters had superior low temperature property, oxidation stability, and remarkably reduced the glass transition temperature of PVC. In conclusion, the prepared epoxide via structural modification from waste cooking oil methyl esters proved to be an effective alternative to dioctyl phthalate, replacing about 40% of the total plasticizer. This may lead to the eco-development of waste cooking oil materials, and makes the plasticizing process more environmentally friendly.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Daqing Tong,Xiaozu Wang,Mohammad Ali,Christopher Q. Lan,Yong Wang,Enrico Drioli,Zhaohui Wang,Zhaoliang Cui
Hydrophobic membrane is desired to avoid pore wetting phenomenon in membrane distillation (MD). In the present paper, highly hydrophobic Hyflon AD60/PVDF composite hollow fiber membranes were prepared by coating a copolymer (Hyflon AD60) of tetrafluoroethylene (TFE) and 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole (TTD) on poly(vinylidene fluoride) (PVDF) membranes. The effects of Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time on the structures and performances of Hyflon AD60/PVDF composite hollow fiber membranes in vacuum membrane distillation (VMD) process were investigated. The results show that the hydrophobicity of PVDF hollow fiber membrane was significantly improved by coating Hyflon AD60. The optimized Hyflon AD60 concentration, coating time, heat-treatment temperature and heat-treatment time were 0.1 wt%, 10–20 min, 40–50 °C and 9 h, respectively. Employing NaCl solution with concentration of 35 g × L −1 , under a vacuum of 0.09 MPa and feed temperature of 70 °C, the water flux and salt rejection of the composite hollow fiber membrane in VMD process reached to approximately 10 kg × m −2 × h −1 and higher than 99.9 %, respectively, and kept stable, indicating that Hyflon AD60/PVDF composite membrane is an excellent candidate for operation in VMD operation.
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高影响因子
POLYMER COMPOSITES
·
2015
·Vol. 37
·期 10
·3003-3014
·
IF 1.632
Tao Liu,Yunxi Li,Yu Su,Hongyang Yu,Nan Zhao,Yanhua Yang,Zhenhua Jiang
Phthalonitrile-based composites containing sodium montmorillonite (MMT 0 ) and modified montmorillonites (MMT 1 and MMT 2 ) were prepared, respectively. The effect of functionalization, content and ball milling of the clay on the morphology, thermal mechanical, and thermal properties of the composites was thoroughly investigated by such methods as small angle X-ray scattering, scanning electron microscopy, and dynamic, mechanical, and thermogravimetric analyses. FTIR and dynamic rheology measurements confirmed that the polymerization reaction of the PAEK-CN prepolymer between individual clay layers had occurred and that intercalated tactoids and exfoliated/delaminated structures might have formed during the curing process. Small angle X-ray scattering patterns reflected the increase of d -spacing after clay modification and the subsequent possible exfoliation of the clay platelets within the phthalonitrile composites. Elevated heat distortion temperature and improved dynamic mechanical properties were observed for the PAEK-CN/clay nanocomposites containing milled clay. Ball milling pristine clay improved the composite properties resulting from homogeneous dispersion to a certain extent, similar to the modified clay. In addition, composite properties depended on the content and modifier structures of the organoclays. POLYM. COMPOS., 37:3003–3014, 2016. © 2015 Society of Plastics Engineers
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2991-2998
·
IF 0
Lechen Chen,Lizhao Xie,Mozhen Wang,Xuewu Ge
Three-dimensional inverse opal SnO2/graphene (IO-SnO2/graphene) microspheres with a size of several tens of microns are first prepared by a well-designed two-step calcination of polystyrene (PS) colloidal crystal template balls infiltrated with the sol precursors of SnO2 and graphene oxide. The polystyrene colloidal crystal template balls are formed by the self-assembly of monodispersed PS microspheres confined in water droplets of an inverse emulsion induced by the slow evaporation of water. Characterization with scanning electronic microscopy, Raman spectra, X-ray diffraction and X-ray photoelectron spectroscopy proved the ordered macroporous inverse opal composed of crystalline SnO2 and in situ reduced GO during the calcination. The pore size depends on the PS microspheres. The UV-vis diffusive reflectance spectra show that the light absorption edge of the prepared IO-SnO2/graphene microspheres can shift more than 400 nm. The photoluminescence spectra indicates that the IO structure and the introduction of rGO make the charge carriers transfer fast and retard the hole/electron recombination in the IO-SnO2/graphene microspheres so that their photocatalytic performance on the UV photolysis of methyl orange is considerably better than that of commercial SnO2 nanoparticles. However, the photocatalytic performance also depends on the content of GO. The addition of 0.06 wt% of GO achieves the best photocatalytic effect. Excessive GO will result in a diminished catalytic activity. This work provides a way to fabricate a new morphological SnO2 based materials with enhanced photocatalytic activity, which helps in the exploration of new photocatalysts with high performance.
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HYDROMETALLURGY
·
2015
·
IF 1.933
Li Chen,Ji Chen,Yu Jing,Deqian Li
Several novel extraction systems were reported since 2-ethylhexyl phosphonic acid mono-(2-ethylhexyl) ester (P507) had been confronted with low selectivity and incomplete stripping for heavy rare earths (HREs). This paper makes a comprehensive appraisal of P507, bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex272), mixture of P507 and Cyanex272, P507 adding isooctanol and bifunctional ionic liquid extractant (Bif-ILE) [trialkylmethyl-ammonium][di-(2-ethylhexyl)orthophosphinate] ([A336][P507]). Thermodynamics study, apparent kinetics study and theoretical calculation for the cascade extraction are all included. We put forward coordination equilibrium effect for the first time to illustrate the inner and outer environment during the coordination. It could be useful to explain the extraction ability and selectivity of different extractants. All these would provide separation of HREs with more feasible and informative understanding and guidance.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Weikang Wang,Yihu Wu,Zhiwen Jiang,Mozhen Wang,Qichao Wu,Xiao Zhou,Xuewu Ge
The subtle control on the self-assembly behavior of graphene oxide (GO) nanosheets is one of effective ways for the preparation of high-performance macroscopic graphene-based materials. In this work, detailed characterizations and discussion on the morphological and compositional changes on the solid products in various alcohol-water dispersions of GO under γ-ray radiation were carried out, proving the concurrent hydroxyalkylation and reduction processes of GO nanosheets in the system, which triggered the spontaneous self-assembly of the hydroxyalkylated and reduced GO nanosheets (HA-rGO). The pH and the volume ratio of alcohol to water (ϕ a/w ) are the key factors to control the self-assembly of the HA-rGO sheets. A free-standing graphene hydrogel (GH) only forms in the strong acid alcohol-water media with an appropriate ϕ a/w . After the freeze-drying of the GH, a macroporous graphene aerogel (GA) was obtained, which exhibited a high absorption performance for not only nonpolar molecules (cyclohexane and kerosene), but also most polar molecules (toluene, chloroform, glycol, etc). This work demonstrates a comprehensive self-assembly mechanism of GO nanosheets in an aqueous media under γ-ray radiation and reveals that GA produced from the reduction of GO can be used as potential super-adsorbents for not only waste oil, but also the polar alcohols.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·
IF 1.174
Kailiang Zeng,Jie Zhou,Zhaoliang Cui,Yue Zhou,Chuan Shi,Xiaozu Wang,Liyue Zhou,Xiaobin Ding,Zhaohui Wang,Enrico Drioli
Membrane fouling is the key problem that occurs in membrane process for water treatment. However, how membrane microstructure influences the fouling behavior is still not clear. In this study, fouling behavior caused by dextran was deeply and systematically investigated by employing four poly(vinylidene fluoride) (PVDF) membranes with different pore sizes, ranging from 24 to 94 nm. The extent of fouling by dextran was accurately characterized by pore reduction, flux decline, and the change of critical flux. The result shows that membrane with the smallest pore size of 24 nm experienced the smallest fouling rate and the lowest fouling extent. As the membrane pore size increased, the critical flux ranges were 105–114, 63–73, 38–44 and 34–43 L·m − 2 ·h − 1 , respectively. The critical flux and fouling resistances indicated that the fouling propensity increases with the increase of membrane pore size. Two pilot membrane modules with mean pore size of 25 nm and 60 nm were applied in membrane filtration of surface water treatment. The results showed that serious irreversible membrane fouling occurred on the membrane with pore size of 60 nm at the permeate flux of 40.5 L·m − 2 ·h − 1 . On the other hand, membrane with pore size of 25 nm exhibited much better anti-fouling performance when permeate flux was set to 40.5, 48 and 60 L·m − 2 ·h − 1 .
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高影响因子
Journal of Coatings Technology and Research
·
2016
·Vol. 14
·期 1
·85-94
·
IF 1.342
Zhao Dong,Liu Dongguang,Hu Zhijia
This work presents the synthesis of corrosion inhibitor [1 H -benzotriazole (BTA)]-loaded hollow silica nanocapsules with magnesium hydroxide precipitate in the shells (HSNs-M/BTA) through inverse microemulsion (W/O) polymerization. TEM and Brunauer–Emmett–Teller (BET) measurements indicate that the silica nanocapsules possess voids in the inner part and mesoporous on the surface. The actual loading capacity of BTA is 287.17 mg (BTA)/1 g (HSNs-M/BTA). The results of UV absorption spectra show that the release of BTA can be triggered by the changing of pH in the corrosion solution. The anticorrosive SiO
x
/ZrO
x
coatings embedded with hydrophobically modified HSNs-M have a better waterproof performance since the water contact angle can reach 140°. In comparison to the passive SiO
x
/ZrO
x
coatings with or without BTA, the enhanced corrosion protection performance of this developed anticorrosive system was observed by both electrochemical impedance spectroscopy and Tafel analysis. The fabrication of nanocapsules with corrosion inhibitors is promising as an intelligent element in protective coatings in the future.
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高影响因子
危险品化学品经营许可证（带存储）