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Youhei Nomura, Shuji Fukahori, Haruhisa Fukada, Taku Fujiwara
Removal efficiencies of sulfamonomethoxine (SMM) and its degradation intermediates formed by treatment with zeolite/TiO2 composites through adsorption and photocatalysis were investigated in fresh aquaculture wastewater (FAWW). Coexistent substances in the FAWW showed no inhibitory effects against SMM adsorption. Although coexistent substances in the FAWW inhibited the photocatalytic decomposition of SMM, the composites mitigated the inhibition, possibly because of concentration of SMM on their surface by adsorption...
July 14, 2017: Journal of Hazardous Materials
Yubo Wei, Qiang Zeng, Qiong Hu, Min Wang, Jia Tao, Lishi Wang
Herein, the self-cleaned electrochemical protein imprinting biosensor basing on a thermo-responsive memory hydrogel was constructed on a glassy carbon electrode (GCE) with a free radical polymerization method. Combining the advantages of thermo-responsive molecular imprinted polymers and electrochemistry, the resulted biosensor presents a novel self-cleaned ability for bovine serum albumin (BSA) in aqueous media. As a temperature controlled gate, the hydrogel film undergoes the adsorption and desorption of BSA basing on a reversible structure change with the external temperature stimuli...
July 20, 2017: Biosensors & Bioelectronics
Jiaqin Deng, Yunguo Liu, Shaobo Liu, Guangming Zeng, Xiaofei Tan, Binyan Huang, Xiaojun Tang, Shengfan Wang, Quan Hua, Zhili Yan
In this work, a novel engineered biochar prepared through modification with chitosan and pyromellitic dianhydride (PMDA) was investigated as an adsorbent for the removal of heavy metal ions from single metal and mixed-metal solutions (Cd, Cu and Pb). Characterization experiments with FTIR and XPS suggested that the novel modified biochar had more surface functional groups compare to the pristine biochar. Adsorption experiments indicated that the initial pH of the solution influenced the ability of biochars to adsorb heavy metals in single- and multi-metal systems...
July 18, 2017: Journal of Colloid and Interface Science
Zezhen Pan, Wenlu Li, John D Fortner, Daniel E Giammar
Surface-functionalized magnetite nanoparticles have high capacity for U(VI) adsorption and can be easily separated from the aqueous phase by applying a magnetic field. A surface-engineered bilayer structure enables the stabilization of nanoparticles in aqueous solution. Functional groups in stearic acid (SA), oleic acid (OA), and octadecylphosphonic acid (ODP) coatings led to different adsorption extents (SA≈ OA > ODP) under the same conditions. The impact of water chemistry (initial loading of U(VI), pH, and the presence of carbonate) has been systematically examined for U(VI) adsorption to OA-coated nanoparticles...
July 27, 2017: Environmental Science & Technology
Kamil Czelej, Marcin Roland Zemła, Piotr Spiewak, Tomasz Wejrzanowski, Krzysztof Jan Kurzydłowski
Intrinsically hydrophobic rare-earth oxides (REOs) have emerged as a robust class of ceramics for a variety of applications. Recently, the hydrophobicity of REOs has been observed experimentally and subsequently scrutinized using electronic structure density functional theory (DFT) calculations. In this work, we applied the DFT method to analyze the possibility of tuning the wettability of commonly used hydrophilic Al2O3 and TiO2 by surface doping with Ce. The calculations indicate that Ce can preferentially segregate to the surface of Al2O3 and TiO2 and form a Ce-rich oxide layer, which is stable under a wide range of oxygen chemical potentials...
July 27, 2017: Physical Chemistry Chemical Physics: PCCP
Seokwon Hyeon, Young-Chul Kim, Jihan Kim
The methane adsorption properties in M-MOF-74 (M = Mg, Ti, V, Cr, Mn, Co, Ni, Cu, and Zn) were investigated for potential adsorbed natural gas (ANG) vehicle applications. In particular, density functional theory (DFT) simulations were conducted to derive the force field parameters that were used in the grand canonical Monte Carlo (GCMC) simulations to obtain the methane adsorption isotherm curves. Our results indicate that commonly used DFT exchange correlation functionals (e.g. vdW-DF, vdW-DF2, PBE+D2) overestimated the methane binding strength to the metal sites, leading to inaccurate description of the adsorption properties...
July 27, 2017: Physical Chemistry Chemical Physics: PCCP
Erum Pervaiz, Muhammad Syam Azher Virk, Zhang Bingxue, Congling Yin, Minghui Yang
Fabrication of nanograins with uniform morphology wrapped with reduced graphene oxide (RGO) in a designed fashion is critical for obtaining large surface, high porosity and efficient catalytic ability at mild conditions. Hybrid structures of metal oxides decorated on two dimensional (2D) RGO lacked interface and channels between individual grains and RGO. Present work merely focused the synthesis of RGO wrapped Co3O4 nanograins architecture in micron sized polyhedrons and the ability of reducing aromatic nitro compounds...
July 27, 2017: Nanotechnology
Sonya Rusiyanova Tsibranska, Anela Ivanova, Slavka Tcholakova, Nikolai D Denkov
Escin belongs to a large class of natural bio-surfactants, called saponins, which are present in more than 500 plant species. Saponins are applied in pharmaceutical, cosmetic, food and beverage industries, due to their variously expressed bioactivity and surface activity. In particular, Escin adsorption layers at the air-water interface exhibit unusually high surface elastic modulus (> 1100 mN/m) and high surface viscosity (ca. 130 N.s/m). The molecular origin of these unusual surface rheological properties is still unclear...
July 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Marc Florent, Dimitrios A Giannakoudakis, Rajiv Wallace, Teresa J Bandosz
Carbon textile swatch was oxidized and impregnated with copper hydroxynitrate. A subsample was then further heated at 280 oC to form copper oxide. The swatches preserved their integrity through the treatments. As final products, they exhibited remarkable detoxification properties for the nerve agent surrogate dimethyl chlorophosphate (DMCP). Based on the amount of reactive copper phases deposited on the fibers, their adsorption capacities were higher than those of the bulk powders. After a one day exposure to DMCP (1:1 weight ratio adsorbent/DMCP), 99 % of the initial amount of DMCP was eliminated...
July 27, 2017: ACS Applied Materials & Interfaces
Rongtai Yu, Feng Liu, Hongqiang Ren, Jichun Wu, Xuxiang Zhang
Nanomaterials of magnesium hydrosilicate Mg3Si2O5(OH)4 were developed for phosphate and ammonium recovery from wastewater in virgin, which had the structure of diffuse interlamellar order, and synthesized under hydrothermal conditions at temperatures of 200°C for 36-72 h from mixtures of magnesite and zeolite as mineralizers. The amount of magnesium released has gone up to 48 mg/g by magnesium hydrosilicate, which was increased with the increase in the weight ratio of magnesite:zeolite. When magnesium hydrosilicate was used to adsorb phosphate and ammonium, electrostatic adsorption was not a dominant mechanism, the adsorbing capacity of phosphate was about 19 mg/g, and the simultaneous adsorbing capacity of ammonium was 7...
July 27, 2017: Environmental Technology
Tiecheng Wang, Yujuan Li, Guangzhou Qu, Qiuhong Sun, Dongli Liang, Shibin Hu, Lingyan Zhu
Surface discharge plasma (SDP) combined with activated carbon (AC) was employed to eliminate dissolved organic matter from micro-polluted source water, with humic acid (HA) as the model pollutant. Synergistic effect on HA removal was observed in the SDP-AC system; HA removal efficiency reached 60.9% within 5-min treatment in the SDP-AC system with 5.0 g AC addition, whereas 16.7 and 17.4% of HA were removed in sole SDP system and AC adsorption, respectively. Scanning electron microscope and Boehm titration analysis showed that chemical reactions between active species and functional groups of AC occurred...
July 26, 2017: Environmental Science and Pollution Research International
Diana Ramos Lima, Laura Klein, Guilherme Luiz Dotto
This work aimed to study the removal of malachite green dye from wastewaters through adsorption using raw corn straw (RCS) and ultrasound-assisted modified corn straw (MCS). RCS and MCS were prepared and characterized in detail. The characterization indicated that RCS and MCS presented favorable structures for malachite green adsorption and that the ultrasound treatment provided a disorganization of the adsorbent's crystalline regions and also caused the formation of cavities and protuberances. The adsorption study was performed by equilibrium isotherms, kinetic curves, thermodynamic parameters, and application in real effluents composed of dye mixtures and inorganic compounds...
July 26, 2017: Environmental Science and Pollution Research International
Yang Wu, Zhongmin Wang, Dianhui Wang, Zhenzhen Wan, Yan Zhong, Chaohao Hu, Huaiying Zhou
Changes in the stability, hydrogen diffusion, and mechanical properties of the NbH phases from Ni-doping was studied by using first-principles methods. The calculation results reveal that the single H atom adsorption is energetically favorable at the tetrahedral interstitial site (TIS) and octahedral interstitial site (OIS). The preferred path of H diffusion is TIS-to-TIS, followed by TIS-to-OIS in both Nb16H and Nb15NiH. Ni-doping in the Nb15NiH alloy lowers the energy barrier of H diffusion, enhances the H-diffusion coefficient (D) and mechanical properties of the Nb16H phase...
July 26, 2017: Scientific Reports
Changlong Sun, Fukun Ma, Liang Cai, Aizhu Wang, Yongzhong Wu, Mingwen Zhao, Wensheng Yan, Xiaopeng Hao
Introducing the synergy effect of magnetic properties and band gap engineering is highly desired for two-dimensional (2D) nanosheets. Here, we prepare metal-free ternary 2D carbon (C) doped boron nitride (BN) nanosheets (BCN) with band gap engineering and magnetic properties by a synergetic way. The substitutional occupation of C atoms, as revealed by X-ray absorption spectrum, in BCN nanosheets induces tunable band gap reduction (5.5 eV to 2.6 eV) and intensive intrinsic ferromagnetism at room temperature...
July 26, 2017: Scientific Reports
Quan Guo, Simon P Duffy, Kerryn Matthews, Emel Islamzada, Hongshen Ma
The separation of leukocytes from whole blood is a prerequisite for many biological assays. Traditional methods require significant sample volumes and are often undesirable because they expose leukocytes to harsh physical or chemical treatment. Existing microfluidic approaches can work with smaller volumes, but lack selectivity. In particular, the selectivity of microfluidic systems based on microfiltration is limited by fouling due to clogging. Here, we developed a method to separate leukocytes from whole blood using the microfluidic ratchet mechanism, which filters the blood sample using a matrix of micrometer-scale tapered constrictions...
July 26, 2017: Scientific Reports
Masaki Onodera, Akira Kirishima, Seiya Nagao, Kouichi Takamiya, Tsutomu Ohtsuki, Daisuke Akiyama, Nobuaki Sato
In 2011, the accident at the Fukushima-Daiichi nuclear power plant dispersed radioactive cesium throughout the environment, contaminating the land, rivers, and sea. Suspended particles containing clay minerals are the transportation medium for radioactive cesium from rivers to the ocean because cesium is strongly adsorbed between the layers of clay minerals, forming inner sphere complexes. In this study, the adsorption and desorption behaviors of radioactive cesium from suspended clay particles in river water have been investigated...
July 17, 2017: Chemosphere
Tayeb Benhalima, Hafida Ferfera-Harrar, Djahida Lerari
Carboxymethyl cellulose hydrogels beads were synthesized by ionotropic gelation in Al(3+) solutions with or without sodium n-dodecyl sulfate (SDS) surfactant as a pore-forming micelle templating and NaCl as porogen agent. FTIR spectroscopy and EDX analysis evidenced the formation of hydrogels. The morphology observed by Scanning Electron Microscopy (SEM) showed rough porous surfaces. The swelling properties in various media were studied. The addition of SDS optimized the capacity and initial rate of swelling...
July 23, 2017: International Journal of Biological Macromolecules
Luca Piantanida, Hannah L Bolt, Neshat Rozatian, Steven L Cobb, Kislon Voïtchovsky
Most plasma membranes comprise a large number of different molecules including lipids and proteins. In the standard fluid mosaic model, the membrane function is effected by proteins whereas lipids are largely passive and serve solely in the membrane cohesion. Here we show, using supported 1,2-dioleoyl-sn-glycero-3-phosphocholine lipid bilayers in different saline solutions, that ions can locally induce ordering of the lipid molecules within the otherwise fluid bilayer when the latter is supported. This nanoordering exhibits a characteristic length scale of ∼20 nm, and manifests itself clearly when mechanical stress is applied to the membrane...
July 25, 2017: Biophysical Journal
Zhanwei Xu, Xiaoli Fan, Hejun Li, Hao Fu, Woon Ming Lau, Xueni Zhao
We invented a practical and simple wet-grinding method to break conventional graphene sheets and CNTs for the production of new graphene/CNTs with adequate edge density (about 25 000 atoms per graphene-fragment of about 1 μm(2) in size) and no detectable changes in intrinsic defects, extrinsic impurities, and even surface-area. Measurements using the standard cyclic voltammetry, rotating disk electrode and rotating ring-disk electrode techniques all confirm that such mildly fragmented graphene, as well as carbon-nanotubes treated similarly using this wet-grinding method, can facilitate the fast 4-electron oxygen reduction reaction (ORR) pathway...
July 26, 2017: Physical Chemistry Chemical Physics: PCCP
Claudia Sperling, Marion Fischer, Manfred F Maitz, Carsten Werner
Neutrophil extracellular trap (NET) formation, a reaction of the innate immune system to fight pathogens, was shown to be involved in thrombus formation. In the present study blood-contacting biomaterials with graded surface characteristics were investigated as a potential cause of NET formation on medical devices. Surface properties are known to govern protein adsorption, cell adhesion and ultimately the activation of several other host defense pathways - potentially also the formation of NETs. Model materials of defined hydrophilic or hydrophobic properties (glass, and thin films of poly(ethylene-alt-maleic anhydride), self-assembled monolayers of methyl terminated alkanethiols, and Teflon AF™) were incubated either with isolated human granulocytes after pre-adsorption with plasma proteins or with human whole blood...
July 26, 2017: Biomaterials Science
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