Enhanced oils and organic solvents absorption by polyurethane foams composites modified with MnO2 nanowires
TL;DR: In this article, a facile and inexpensive method was proposed to fabricate an effective and recyclable oil-absorbent, namely MnO2 nanowires/polyurethane (PU) foam composites, using a PU sponge as a porous substrate and MnO 2-nanowires as modifiers.
About: This article is published in Chemical Engineering Journal.The article was published on 2017-02-01. It has received 187 citations till now.
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TL;DR: In this paper, the theory and design of various superwetting states for selective oil/water separation including superhydrophobicity/superoleophilicity, super-hydrophilicity/underwater superoleophobicity, Janus wettability, and smart Wettability are discussed.
249 citations
TL;DR: The basic principles of the adsorption process will be elucidated, including affecting factors, evaluation index, adsorbent mechanisms, and common kinetic and isotherm models, and key parameters affecting the Adsorption performance will be discussed.
Abstract: The shortage of water resources and increasingly serious water pollution have driven the development of high-efficiency water treatment technology. Among a variety of technologies, adsorption is widely used in environmental remediation. As a class of typical adsorbents, metal oxides have been developed for a long time and continued to attract widespread attention, since they have unique physicochemical properties, including abundant surface active sites, high chemical stability, and adjustable shape and size. In this review, the basic principles of the adsorption process will be first elucidated, including affecting factors, evaluation index, adsorption mechanisms, and common kinetic and isotherm models. Then, the adsorption properties of several typical metal oxides, and key parameters affecting the adsorption performance such as particle/pore size, morphology, functionalization and modification, supports and calcination temperature will be discussed, as well as their application in the removal of various inorganic and organic contaminants. In addition, desorption and recycling of the spent adsorbent are summarized. Finally, the future development of metal oxide based adsorbents is also discussed.
222 citations
TL;DR: In this paper, a hierarchical SiO2@MnO2 structure was incorporated into the HBCSM aerogel to not only improve the surface roughness and hydrophobic properties but also enhance the absorption capacity and mechanical durability.
159 citations
TL;DR: In this paper, a simple and effective strategy was developed to fabricate the super-hydrophobic cellulose/LDH (layered double hydroxide) membrane in an open oil/water two-phase system, which perfectly integrates the processes of hydrothermal reaction and hydrophobic modification.
152 citations
TL;DR: Aerogels, as ultralight three-dimensional (3D) highly porous materials, show great superiority in oil and organic pollutant cleanup as discussed by the authors, and have also attracted wide interest due to their ability to be used in many applications.
Abstract: Aerogels, as ultralight three-dimensional (3D) highly porous materials, show great superiority in oil and organic pollutant cleanup. Notably, biomass aerogels have also attracted wide interest due ...
142 citations
References
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TL;DR: This work presents a self-assembly method for constructing thermally stable, free-standing nanowire membranes that exhibit controlled wetting behaviour ranging from superhydrophilic tosuperhydrophobic, and suggests an innovative material that should find practical applications in the removal of organics, particularly in the field of oil spill cleanup.
Abstract: The construction of nanoporous membranes is of great technological importance for various applications, including catalyst supports, filters for biomolecule purification, environmental remediation and seawater desalination. A major challenge is the scalable fabrication of membranes with the desirable combination of good thermal stability, high selectivity and excellent recyclability. Here we present a self-assembly method for constructing thermally stable, free-standing nanowire membranes that exhibit controlled wetting behaviour ranging from superhydrophilic to superhydrophobic. These membranes can selectively absorb oils up to 20 times the material's weight in preference to water, through a combination of superhydrophobicity and capillary action. Moreover, the nanowires that form the membrane structure can be re-suspended in solutions and subsequently re-form the original paper-like morphology over many cycles. Our results suggest an innovative material that should find practical applications in the removal of organics, particularly in the field of oil spill cleanup.
1,012 citations
TL;DR: The importance of designing different porous structures of graphene to meet future challenges is highlighted, and the trend on future design of porous graphene materials is analyzed.
Abstract: In order to make full utilization of the high intrinsic surface area of graphene, recently, porous graphene materials including graphene nanomesh, crumpled graphene and graphene foam, have attracted tremendous attention and research interest, owing to their exceptional porous structure (high surface area, and high pore volume) in combination with the inherent properties of graphene, such as high electronic conductivity, good thermal stability, and excellent mechanical strength. Interestingly, porous graphene materials and their derivatives have been explored in a wide range of applications in the fields of electronic and photonic devices, energy storage, gas separation/storage, oil absorption and sensors. This article reviews recent progress in the synthesis, characterization, properties, and applications of porous graphene materials. We aim to highlight the importance of designing different porous structures of graphene to meet future challenges, and the trend on future design of porous graphene materials is analyzed.
635 citations
TL;DR: Aerogels are an exceptional class of porous material with a number of excellent physicochemical properties such as low density, high porosity, high surface area and adjustable surface chemistry as discussed by the authors.
457 citations
TL;DR: The PU@Fe3O4@SiO2@FP sponges could be used as membranes for oil/water separation and for continuous separation of large amounts of oil pollutants from the water surface with the help of a pump.
Abstract: Magnetic, durable, and superhydrophobic polyurethane (PU) sponges were fabricated by chemical vapor deposition (CVD) of tetraethoxysilane (TEOS) to bind the Fe3O4 nanoparticles tightly on the sponge and then dip-coating in a fluoropolymer (FP) aqueous solution. The sponges were characterized using scanning electron microscopy and other analytical techniques. The effects of CVD time of TEOS and FP concentration on wettability, mechanical properties, oil absorbency, and oil/water selectivity of the sponges were also investigated. The sponges exhibit fast magnetic responsivity and excellent superhydrophobicity/superoleophilicity (CAwater = 157° and CAoil ≈ 0°). The sponges also show very high efficiency in oil/water separation and could, driven by a magnet, quickly absorb floating oils on the water surface and heavy oils under water. Moreover, the PU@Fe3O4@SiO2@FP sponges could be used as membranes for oil/water separation and for continuous separation of large amounts of oil pollutants from the water surfac...
391 citations
TL;DR: In this paper, an amphiphilic super-absorbents were assembled from cellulose nanofibrils (CNFs) that were defibrillated from rice straw cellulose at 96.8% yield.
Abstract: Ultra-light (1.7 to 8.1 mg cm−3) and ultra-porous (99.5 to 99.9%) aerogels have been assembled from cellulose nanofibrils (CNFs) that were defibrillated from rice straw cellulose at 96.8% yield. The as-prepared aerogels, amphiphilic super-absorbents, absorbing 210 and 375 times water and chloroform, respectively, are far superior to any previously reported cellulose aerogel. Vapor deposition with triethoxyl(octyl) silane turned the amphiphilic aerogel more hydrophobic and oleophilic, capable of absorbing 139–356 times non-polar hydrocarbons, polar aprotic solvents and oils, surpassing all previously reported polymeric, cellulosic and carbonaceous aerogels by 2 to nearly 20 times. These aerogels are excellent amphiphilic super-absorbents for selective oil removal and recovery.
342 citations