CARBON
·
2017
·
IF 6.337
Jianliang Xiao,Jifei Zhang,Weiyang Lv,Yihu Song,Qiang Zheng
Comprehensive treatment of multifarious contaminations in waterbody demands multifunctional adsorbents with easy reusability , high efficiency, and broad-spectrum adsorption performance. Herein hydrothermally reduced graphene oxide/poly (vinyl alcohol) (TRGO/PVA) aerogels fulfilling these requirements were developed via a facile and green in situ hydrothermal reduction followed by direct sol-aerogel transformation strategy. The interfacial interaction between TRGO sheets and PVA macromolecules as proved by various methods could effectively prevent TRGO from aggregation, which improves mechanical and adsorption performances and assures reusability of aerogels. The aerogels demonstrate an attractive broad-spectrum universality in adsorbing diverse cationic, anionic and nonionic dyes, surpassing most adsorbents that could only remove either positively or negatively charged dyes. The aerogels demonstrate a promising synergetic effect for adsorption two oppositely charged dyes, exhibiting the highest total adsorption amount (>900 mg/g) among known absorbents for removing mixed dyes. Besides, the aerogels after hydrophobic modification are able to effectively adsorb common oils and organic solvents spilling on water. Furthermore, the aerogels are compressible, dimension stable and solvent resistive and can be easily regenerated, bringing a great superiority in the comprehensive treatment of multiple contaminations in waterbody.
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高影响因子
ACS Nano
·
2017
·
IF 13.942
Yi Wu,Shuxue Zhou,Bo You,Limin Wu
Hydro- and oleophobic (namely, omniphobic) coatings or surfaces have many important applications, but tremendous challenges in fabrication aspects still remain. Herein, we report a bioinspired design and nanofabrication of three-dimensional (3D) tribrachia-post arrays with re-entrant geometry (3D TPARG) for superhydrophobic and oleophobic polymer films or surfaces. By simply controlling the temperatures and time to treat silica colloidal templates, we can readily fabricate 3D ordered polymer arrays of tribrachia-posts or hexagonal tribrachia-posts with re-entrant geometries that resemble the skin of a springtail insect after the template is removed. These polymer surfaces exhibit excellent and self-healing superhydrophobicity and oleophobicity even against temperature, acids, alkalis, and mechanical damage. Moreover, their liquid-infused nanostructured surfaces still display very good liquid-sliding ability for water and oils. Our 3D TPARG design strategy may help the development of omniphobic polymer coatings or surfaces for practical applications in self-cleaning surfaces, liquid transport, antifouling materials, and many other important fields.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Chunping Su,Hao Yang,Huiping Zhao,Yunling Liu,Rong Chen
Superhydrophobic and superoleophilic chitosan sponge (MCTCS) was successfully prepared via a facile freeze-drying method with the assistance of TPP/citral crosslinking and octadecanethiol modification. The three dimensional porous structure endowed the MCTCS sponges with large pore volume and good compressive property. Moreover, the MCTCS sponge could effectively absorb oil with an absorptive capacity up to 60 times of its own weight. More importantly, the MCTCS sponge could selectively absorb the emulsified oils in water effectively, and achieve continuous oil–water separation with the assistance of peristaltic pump. The oil and water separation efficiency was up to 99%. Furthermore, the MCTCS sponge still maintained a highly absorptive capacity after being reused for many cycles and possessed ideal biodegradability. It was believed that the superhydrophobic/superoleophilic chitosan sponge would be a promising absorbent material for the removal of oil from water in environmental remediation.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Wenjing Ma,Sangram Keshari Samal,Zhongche Liu,Ranhua Xiong,Stefaan C. De Smedt,Bharat Bhushan,Qilu Zhang,Chaobo Huang
In the last few years, the amount of industrial oily wastewater discharge and number of oil spill accidents have increased exponentially, spurring the development of highly efficient, cost-effective oil-water separation technologies. In this study, a dual pH- and ammonia-vapor-responsive polyimide (PI)-based nanofibrous membrane with high permeate flux and stability was developed for oil-water separations. The membrane was prepared by successively dip-coating electrospun PI in decanoic acid (DA)-TiO 2 and silica nanoparticles (SNPs). The novel SNP/DA-TiO 2 /PI membrane exhibits superhydrophobicity in air and superoleophilicity in neutral aqueous environments (e.g., at pH 6.5). However, the membrane becomes hydrophilic and superoleophobic in basic aqueous environments (e.g., at pH 12), resulting in only water permeation during oil-water separations. The oil-water separation potential of this innovative dual-responsive membrane was investigated using several model oil-water mixtures. The membrane has extremely high flux (6500±100 L m −2 h −1 ) and separation efficiency (>99%) and is reusable. In addition, thermal stability and abrasion resistance tests show that the membrane is highly stable under extreme conditions. This dual-responsive electrospun nanofibrous membrane has potential for use in industrial oil-polluted water and oil spill treatment and in systems that require selective oil-water permeation. Furthermore, changes in the surface wettability can also be induced by exposure to ammonia vapor, which might facilitate remote-controlled oil-water separations.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Fei-Fei Chen,Ying-Jie Zhu,Zhi-Chao Xiong,Tuan-Wei Sun,Yue-Qin Shen
Traditional paper made from plant cellulose fibers is easily destroyed by either liquid or fire. In addition, the paper making industry consumes a large amount of natural trees and thus causes serious environmental problems including excessive deforestation and pollution. In consideration of the intrinsic flammability of organics and minimizing the effects on the environment and creatures, biocompatible ultralong hydroxyapatite nanowires are an ideal building material for inorganic fire-resistant paper. Herein, a new kind of free-standing, highly flexible, superhydrophobic, and fire-resistant layered inorganic paper has been successfully prepared using ultralong hydroxyapatite nanowires as building blocks after the surface modification with sodium oleate. During the vacuum filtration, ultralong hydroxyapatite nanowires assemble into self-roughened setalike microfibers, avoiding the tedious fabrication process to construct the hierarchical structure; the self-roughened microfibers further form the inorganic paper with a nacrelike layered structure. We have demonstrated that the layered structure can significantly improve the resistance to mechanical destruction of the as-prepared superhydrophobic paper. The as-prepared superhydrophobic and fire-resistant inorganic paper shows excellent nonflammability, liquid repellency to various commercial drinks, high thermal stability, and self-cleaning property. Moreover, we have explored the potential applications of the superhydrophobic and fire-resistant inorganic paper as a highly effective adsorbent for oil/water separation, fire-shielding protector, and writing paper.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 31
·12126-12135
·
IF 8.262
Jianliang Xiao,Weiyang Lv,Zhou Xie,Yeqiang Tan,Yihu Song,Qiang Zheng
π–π interactions between graphene and organic dyes with a conjugate aromatic structure play a key role in the field of high-efficiency, broad-spectrum adsorbents for the removal of water contaminants. L-Cysteine reduced graphene oxide (RGO-Cys) has a good conjugate structure and dispersity in aqueous solution, endowing it with great adsorption efficiency towards anionic, nonionic and cationic dyes with a conjugate aromatic structure mainly via π–π interactions, as proved by the Raman spectrum and special adsorption experiments. The maximum adsorption capability for anionic indigo carmine (IC) and cationic neutral red (NR) is as high as 1005.7 mg g−1 and 1301.8 mg g−1, respectively, the former being the highest among those reported for adsorbents known to date. The total adsorption amount in mixed dye solutions is even higher (>3500 mg g−1), the highest total capability for simultaneous adsorption of anionic and cationic dyes in their solution mixtures. The π–π stacking adsorption mechanism ensures RGO-Cys to be used as a broad-spectrum adsorbent with high efficiency for many kinds of dye contaminants in water while the remnant carboxyl groups on graphene nanosheets facilitate effective adsorption towards Cu2+ with a capability as high as 139.2 mg g−1, opening up many possibilities for the use of graphene in water cleaning including disinfection, decontamination, and desalination.
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高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Qiang Wang,Bing Dai,Jie Bai,Zhenhuai Yang,Shuai Guo,Yujie Ding,Lei Yang,Pei Lei,Jiecai Han,Jiaqi Zhu
A simple and efficient strategy is introduced for fabricating a layer of superhydrophobic and superoleophilic membrane on the surface of porous materials by self-assembly, and it is of great interest for the new type separation of oil and water. It is realized in this study by synthesizing an array of vertically aligned composite microcones on the surface of nickel foam by microwave plasma assisted chemical vapor deposition . The hierarchical structure, high aspect ratio , and dual-scale pine tree-like nature of the microcones formed on the nickel foam, which has microscale pores, in combination with the low surface energy of carbon, amplify both the hydrophobicity and the oleophilicity of the membrane. In addition, the membrane exhibits pH-responsivity, and the controllable water permeation can be realized by simply altering the water pH. Given its extremely high hydrophobicity and oleophilicity as well as outstanding mechanical durability, the composite frame can be used as a filter to separate oil/water mixtures and as an intelligent sponge to purify oil-contaminated water with excellent separation efficiency and absorption capacity . It should also be ideal for real world use in various environmental and chemical separation processes.
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高影响因子
BIOMEDICINE & PHARMACOTHERAPY
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2016
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IF 2.326
Wenjuan Yao,Lei Huang,Qinju Sun,Lifeng Yang,Lian Tang,Guoliang Meng,Xiaole Xu,Wei Zhang
Macrophage foam cell formation triggered by oxLDL is an important event that occurs during the development of atherosclerosis . 2,3,5,4′-Tetrahydroxystilbene-2- O -β- d -glucoside (TSG) exhibits significant anti-atherosclerotic activity. Herein we used U937 cells induced by PMA and oxLDL in vitro to investigate the inhibitory effects of TSG on U937 differentiation and macrophage foam cell formation. TSG pretreatment markedly inhibited cell differentiation induced by PMA, macrophage apoptosis and foam cell formation induced by oxLDL. The inhibition of vimentin expression and cleavage was involved in these inhibitory effects of TSG. The suppression of vimentin by siRNA in U937 significantly inhibited cell differentiation, apoptosis and foam cell formation. Using inhibitors for TGFβR1 and PI3K, we found that vimentin production in U937 cells is regulated by TGFβ/Smad signaling, but not by PI3K-Akt-mTOR signaling. Meanwhile, TSG pretreatment inhibited both the expression of TGFβ1 and the phosphorylation of Smad2 and Smad3, and TSG suppressed the nuclear translocation of Smad4 induced by PMA and oxLDL. Furthermore, TSG attenuated the induced caspase-3 activation and adhesion molecules levels by PMA and oxLDL. PMA and oxLDL increased the co-localization of vimentin with ICAM-1, which was attenuated by pretreatment with TSG. These results suggest that TSG inhibits macrophage foam cell formation through suppressing vimentin expression and cleavage, adhesion molecules expression and vimentin-ICAM-1 co-localization. The interruption of TGFβ/Smad pathway and caspase-3 activation is responsible for the downregulation of TSG on vimentin expression and degradation, respectively.
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高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2017
·Vol. 302
·期 9
·1700086
·
IF 2.863
Junjun Chen,Yingxin Zhang,Cheng Chen,Mengya Xu,Gang Wang,Zhixiang Zeng,Liping Wang,Qunji Xue
Oil–water emulsions stabilized by surfactants are fine dispersions of oil in water or of water in oil and difficult to separate which will lead to serious water pollution. A more recent development is the ability to fabricate oleophobic–hydrophilic surfaces in air, which are not easy to construct due to the difference surface tension between water and oil. Herein, a cellulose sponge with multipore structure is fabricated to increase the removal efficiency. Amphiphilic molecular brushes of polyethylene glycol with short perfluorinated end caps (F-PEG) are grafted on cellulose sponges to solve the contradictory relation of hydrophilicity and oleophobicity and improve oil/water selective wettability and fouling resistance. Besides, stable superhydrophilicity and superoleophobicity under water, corrosive liquids, and high oleophobicity in air conditions are exhibited in the F-PEG grafted porous cellulose sponges with textured surfaces (F-g-CS). And the separation efficiency and rate of F-g-CS with surface of nanopores are 99.92% and 180 L m −2 h −1 , while that of micropores are 99.83% and 297 L m −2 h −1 only under gravity. It is demonstrated that the grafting F-PEG molecules imparted F-g-CS of micropores surface with high flux and separation efficiency simultaneously. Furthermore, antifouling property and collection of water in oil–water mixture without fouling are possessed in F-g-CS.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Zhuqing Wang,Pengxiang Jin,Min Wang,Genhua Wu,Chen Dong,Aiguo Wu
We prepared a cost-effective, environmentally friendly carbonaceuous oil sorbent with a lotus effect structure using a simple one-pot hydrothermal reaction and a mild modification process. The carbonaceous oil sorbent can rapidly, efficiently, and continuously collect oil in situ from a water surface. This sorbent was unlike traditional sorbents because it was not dependent on the weight and volume of the sorption material. The sorbent was also successfully used to separate and collect crude oil from the water surface and can collect organic solvents underwater. This novel oil sorbent and oil-collection device can be used in case of emergency for organic solvent leakages, as well as leakages in tankers and offshore drilling platforms.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Wei Zhou,Guangji Li,Liying Wang,Zhifeng Chen,Yinlei Lin
A simple dip-coating method was explored to construct hierarchical structures on a 3D copper foam (CF) surface by combining the intrinsic properties of mussel-inspired polydopamine (PDA) and a 3D metal structure. The CF substrate was sequentially modified with PDA and Ag nanoparticles (NPs) and then coupled with n -dodecyl mercaptan (NDM) to create a durable superhydrophobic CF for oil/water separation. The morphology, chemical composition and wettability of the fabricated modified CF surface were characterized. The modified CF surface possesses an increased roughness and exhibits superhydrophobicity, with water contact angle values greater than 150°. The PDA coating on the CF surface can reduce silver ions and anchor the formed NPs onto the surface to construct the hierarchical structure of the superhydrophobic CF. Furthermore, the oil/water separation properties were also investigated. The modified CF can separate a series of oil/water mixtures with a high efficiency and relatively high intrusion pressure. More importantly, the modified CF retains its high efficiency after 30 repeated uses (more than 98% for a dodecane/water mixture), exhibiting excellent durability. The mechanism of oil/water separation is also discussed. The results of this study indicate that the modified CF can serve as a promising candidate for the large-scale separation of oily pollutants from water.
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高影响因子
LANGMUIR
·
2024
·
IF 3.7
Man Li,Min Luo,Xiaoxiao Niu,Angsen Sheng,Zhen Wang,Xiaoqing He,Huaiyu Bu,Gang Xie
Synthesis methods of carbon nanomaterials have been developed vigorously in recent years, among which a simple, green, and mature approach is of more research significance. Carbon nanomaterials have depicted an impact on the growth and development of plants. In this study, a new type of carbon nanomaterial, superhydrophilic carbon aerogel (CA), was synthesized via a hydrothermal process using carbohydrates and water-soluble polymers as raw materials. Characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, and N2 adsorption analysis, the exemplified CA presented to have porous three-dimensional network structure composed of individual particles with diameters of 25 nm, with reactive surface, single composition, high specific surface area (89.94 m2·g–1), and wide range of density variation. The 9 mg·mL-1 CA suspension had a significant positive effect on the root growth of wheat seedlings, with promoted root elongation (about 67.17% longer) and root diameter (about 28.95% thicker) compared with those of the control group. The cytological results suggested that CA treatment triggered the propagation of meristematic cells, and the increased number of meristematic cells (65.79% more than the control group) led to enhanced root growth by upregulated expression of related phytohormone genes in wheat seedlings.
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高影响因子
危险品化学品经营许可证（带存储）