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Monica Terracciano, Michela Napolitano, Luca De Stefano, Anna Chiara De Luca, Ilaria Rea
Diatomite is a fossil material made of amorphous porous silica. In this work, polyethylene glycol (PEG)-modified diatomite NPs (PEG-DNPs) are decorated with gold NPs (AuNPs) by one-pot liquid-phase synthesis. Nanocomplexes (PEG-DNPs@AuNPs), with an average size of about 450 nm, are characterized by dynamic light scattering, electron microscopy, nitrogen adsorption/desorption analysis, UV-VIS and photoluminescence spectroscopies. Preliminary studies on the use of the nanocomplex in nanomedicine are also presented...
March 19, 2018: Nanotechnology
Greg A Mutch, Sarah Shulda, Alan J McCue, Martin J Menart, Cristian V Ciobanu, Chilan Ngo, James A Anderson, Ryan M Richards, David Vega-Maza
Solid metal oxides for carbon capture exhibit reduced adsorption capacity following high temperature exposure, due to surface area reduction by sintering. Furthermore, only low coordinate corner/edge sites on the thermodynamically sta-ble (100) facet display favourable binding towards CO2 , providing inherently low capacity. The (111) facet however, exhibits a high concentration of low coordinate sites. In this work, MgO(111) nanosheets displayed high capacity for CO2 , as well as a ≈ 65% increase in capacity despite a ≈ 30% reduction in surface area following sintering (0...
March 19, 2018: Journal of the American Chemical Society
Xuguang Li, Tong Li, Tong Zhang, Cheng Gu, Shourong Zheng, Haijun Zhang, Wei Chen
Nano-scale titanium dioxide (nTiO2) is one of the most widely used metal oxide nanomaterials. Once released into the environment, nTiO2 may catalyze abiotic transformation of contaminants, and consequently affect their fate and effects. Here, we show that the overall catalytic efficiency of nTiO2 for the dehydrochlorination reaction of 1,1,2,2-tetrachloroethane, a commonly used solvent, depends on the crystalline phase and exposed facets of nTiO2, which significantly affect the adsorption capacity and surface catalytic activity of nTiO2...
March 19, 2018: Environmental Science & Technology
Chang-Gu Lee, Hassan Javed, Danning Zhang, Jae-Hong Kim, Paul Westerhoff, Qilin Li, Pedro J J Alvarez
Using a bi-polymer system consisting of polyvinylpyrrolidone (PVP) and poly(vinylidene fluoride) (PVDF), P25-TiO2 was immobilized into thin film mats of porous electrospun fibers. Pores were introduced by dissolving sacrificial PVP to increase surface area and enhance access to TiO2. The highest photocatalytic activity was achieved using a PVDF:PVP weight ratio of 2:1. Methylene blue (MB) was used to visualize contaminant removal, assess the sorption capacity (5.93 ± 0.23 mg/g) and demonstrate stable removal kinetics (kMB > 0...
March 19, 2018: Environmental Science & Technology
Huanyu Jin, Chunxian Guo, Xin Liu, Jinlong Liu, Anthony Vasileff, Yan Jiao, Yao Zheng, Shi-Zhang Qiao
Over the past few decades, the design and development of advanced electrocatalysts for efficient energy conversion technologies have been subjects of extensive study. With the discovery of graphene, two-dimensional (2D) nanomaterials have emerged as some of the most promising candidates for heterogeneous electrocatalysts due to their unique physical, chemical, and electronic properties. Here, we review 2D-nanomaterial-based electrocatalysts for selected electrocatalytic processes. We first discuss the unique advances in 2D electrocatalysts based on different compositions and functions followed by specific design principles...
March 19, 2018: Chemical Reviews
Mingzhao Guo, Lufan Yang, Jiahui Li, Song Jiao, Yujun Wang, Guangsheng Luo, Huimin Yu
In this work, the drastic change in the reaction rate throughout the acrylonitrile bio-hydration reaction, which was catalyzed by Rhodococcus ruber TH3 free cells in a two-liquid-phase system, was studied by changing the initial mass fraction of acrylonitrile and acrylamide. We found that the reaction rate was sensitively affected by the contact area between the acrylonitrile droplets and cells. With the acrylonitrile mass fraction of 3 wt%, the cell solution of 800 U/mL could make the superficial area of acrylonitrile droplets saturated...
March 19, 2018: Bioprocess and Biosystems Engineering
Kamila Kočí, Ivana Troppová, Martin Reli, Lenka Matějová, Miroslava Edelmannová, Helena Drobná, Lada Dubnová, Anna Rokicińska, Piotr Kuśtrowski, Libor Čapek
Neodymium enriched TiO2 anatase-brookite powders were prepared by unconventional method via using pressurized hot fluids for TiO2 crystallization and purification. The photocatalysts were tested in the CH3 OH photocatalytic decomposition and they were characterized with respect to the textural (nitrogen adsorption), structural (XRD, XPS, and Raman spectroscopies), chemical (XRF), and optical (DR UV-Vis spectroscopy) and photoelectrochemical measurement. All prepared materials were nanocrystalline, had biphasic (anatase- brookite) structure and relatively large specific surface area (125 m2 ...
2018: Frontiers in Chemistry
Justin Weinberg, Shaojie Zhang, Gillian Crews, Giorgio Carta, Todd Przybycien
Chemical modification of Protein A (ProA) chromatography ligands with polyethylene glycol (PEGylation) has been proposed as a strategy to increase the process selectivity and resin robustness by providing the ligand with a steric repulsion barrier against non-specific binding. This article comprises a comprehensive study of IgG adsorption and transport in Repligen CaptivA PriMAB resin with PEGylated ProA ligands that are modified using 5.2 and 21.5 kDa PEG chains. We studied the impact of the molecular weight of the PEG as well as the extent of PEGylation for the 5...
March 9, 2018: Journal of Chromatography. A
Silan Bai, Qiong Hu, Qiang Zeng, Min Wang, Lishi Wang
Herein, we reported the fabrication of conjugated microporous polymer (CMP) films based on three thiophene derivatives using a one-step templateless electropolymerization in dichloromethane without any surfactants. The formation of hydrophilic or hydrophobic films with specific morphology is a comprehensive result of the polymerization sites in each monomer, the polymerization rate and the gas bubble produced in situ during the polymerization process, which can be easily controlled by the experimental conditions, such as electropolymerization method, electrolyte and "trace water" existed in the organic solvent...
March 17, 2018: ACS Applied Materials & Interfaces
Sara Mola Ali Abasiyan, Gholam Reza Mahdavinia
In this study, magnetic nanocomposite hydrogels based on polyvinyl alcohol were synthesized. Magnetic polyvinyl alcohol/laponite RD (PVA-mLap) nanocomposites were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The results indicated that PVA-mLap had desirable magnetic-sorption properties and magnetic-laponite nanoparticles were successfully synthesized and added to polyvinyl alcohol. The present nanocomposites were applied to remove Cd2+ from aqueous solution...
March 17, 2018: Environmental Science and Pollution Research International
Dandan Yao, Lei Zhang, Jiaojiao Huang, Chenghong Sun, Yu Zhang, Xiaoli Gu, Chong-Zhi Wang, Fei Li, Lina Chen, Chun-Su Yuan
In this work, surface magnetic molecularly imprinted polymers (SMMIPs) were synthesized and used as artificial receptors in the dispersive magnetic solid phase extraction (DMSPE) for capturing potential neuronal nitric oxide synthase-post synaptic density protein-95 (nNOS-PSD-95) uncouplers, which is known as neuroprotection against stroke. Factors that affected selective separation and adsorption of the artificial receptors, such as the amount of template, the types of functional monomer and porogen solvents, and the molar ratio of template/functional monomer/cross-linker were optimized...
March 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
Chong Chen, Nengjie Feng, Qirui Guo, Zhong Li, Xue Li, Jing Ding, Lei Wang, Hui Wan, Guofeng Guan
Targeting CO2 capture application, a new strategy for building multiple adsorption sites in metal-organic framework MIL-101(Cr) was constructed through the incorporation of diethylenetriamine-based ionic liquid (DETA-Ac) via a post-synthetic modification approach. The DETA-Ac, with multi-amine-tethered cation and acetate anion, could not only provide additional binding sites, but also enhance the affinity of framework surfaces toward CO2 . Simultaneously, the high surface area and large cage size of MIL-101(Cr) ensured the better dispersion of IL, thus exposing more active sites for CO2 adsorption...
March 12, 2018: Journal of Colloid and Interface Science
Nelly Flores, Farbod Sharif, Nael Yasri, Enric Brillas, Ignasi Sirés, Edward P L Roberts
This work compares the ability of physical and chemical treatments, namely adsorption and electrochemical advanced oxidation processes, to remove tyrosol from aqueous medium. Adsorption on graphene nanoplatelets (GNPs) performed much better than that with a graphite intercalation compound. Adsorption isotherms were found to follow the Freundlich model (R2  = 0.96), which is characteristic of a chemisorption process. Successful electrochemical regeneration enables 5 successive adsorption/regeneration cycles before corrosion of GNPs occurs...
March 7, 2018: Chemosphere
Pin Hou, Zhe Yan, Fred S Cannon, Ye Yue, Timothy Byrne, Cesar Nieto-Delgado
In order to obtain a high adsorption capacity for perchlorate, the epoxide-forming quaternary ammonium (EQA) compounds were chemically bonded onto granular activated carbon (GAC) surface by cationic reaction. The optimum preparation condition of the cationic GAC was achieved while applying softwood-based Gran C as the parent GAC, dosing EQA first at a pH of 12, preparation time of 48 h, preparation temperature of 50 °C, and mole ratio of EQA/oxygen groups of 2.5. The most favorable cationic GAC that had the QUAB360 pre-anchored exhibited the highest perchlorate adsorption capacity of 24...
March 6, 2018: Chemosphere
ChuanYang Cai, ShuangYu Yu, XinYue Li, Yu Liu, Shu Tao, WenXin Liu
Two typical types of electronic waste (E-waste) were selected to investigate the emission characteristics of polycyclic aromatic hydrocarbons (PAHs) during pyrolytic processing, including emission factor, compositional profile, size distribution and gas-particle partitioning. The mean emission factors (EFs) of total PAHs were measured to be 2.77 ± 1.41 μg/g and 23.65 ± 14.52 μg/g for printed wiring boards and plastic casings, respectively, lower than those for coal combustion and biomass burning...
March 9, 2018: Journal of Hazardous Materials
Dong Li, Xiaolei Guo, Haoran Song, Tianyi Sun, Jiafeng Wan
Graphite-like material is widely used for preparing various electrodes for wastewater treatment. To enhance the electrochemical degradation efficiency of Nano-graphite (Nano-G) anode, RuO2 -TiO2 /Nano-G composite anode was prepared through the sol-gel method and hot-press technology. RuO2 -TiO2 /Nano-G composite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and N2 adsorption-desorption. Results showed that RuO2 , TiO2 and Nano-G were composited successfully, and RuO2 and TiO2 nanoparticles were distributed uniformly on the surface of Nano-G sheet...
March 8, 2018: Journal of Hazardous Materials
Longfei Liu, Deyun Li, Chengliang Li, Rong Ji, Xiaofei Tian
Due to considerable application of perfluorooctanoic acid (PFOA) and its refractory degradation, the widespread distribution of PFOA has already resulted in its' risks to environment and organisms. However, the intrinsic characteristic of pristine multi-walled carbon nanotubes (MWCNTs) limited their application for removing PFOA from aqueous medium. Therefore, three nano-metals (nano-crystalline iron, copper and zinc) grafted MWCNTs were synthesized and characterized by BET-N2 , TEM, FTIR, XPS and XRD as well as MWCNTs (as the control treatment) in this study...
March 8, 2018: Journal of Hazardous Materials
Hanh T M Phan, Jason C Bartz, Jacob Ayers, Benoit I Giasson, Mathias Schubert, Keith B Rodenhausen, Negin Kananizadeh, Yusong Li, Shannon L Bartelt-Hunt
The assembly and accumulation of α-synuclein fibrils are implicated in the development of several neurodegenerative disorders including multiple system atrophy and Parkinson's disease. Pre-existing α-synuclein fibrils can recruit and convert soluble non-fibrillar α-synuclein to the fibrillar form similar to what is observed in prion diseases. This raises concerns regarding attachment of fibrillary α-synuclein to medical instruments and subsequent exposure of patients to α-synuclein similar to what has been observed in iatrogenic transmission of prions...
March 9, 2018: Colloids and Surfaces. B, Biointerfaces
Masoud Erfani, Vahid Javanbakht
In this study, the removal of Methylene Blue dye was investigated by biocomposite beads synthesized from sodium alginate and wastes of oil extraction from almond peanut. Prepared biocomposite was characterized using X-ray diffraction, Infrared spectroscopy, scanning electron microscopy, Energy Dispersive X-Ray analysis. The adsorption capacities of Methylene Blue were investigated with respect to the effect of the adsorbent amount, pH value, and initial dye concentration. The kinetic adsorption data were analyzed by the pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion kinetic models...
March 14, 2018: International Journal of Biological Macromolecules
Lulu Ning, Yuguang Mu
Prion diseases are neurodegenerative disorders characterized by the aggregation of an abnormal form of prion protein. The interaction of prion protein and cellular membrane is crucial to elucidate the occurrence and development of prion diseases. Its fragment, residues 106-126, has been proven to maintain the pathological properties of misfolded prion and was used as a model peptide. In this study, explicit solvent molecular dynamics (MD) simulations were carried out to investigate the adsorption, folding and aggregation of PrP106-126 with different sizes (2-peptides, 4-peptides and 6-peptides) on the surface of both pure neutral POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) and negatively charged POPC/POPG (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol) (3:1) lipids...
March 14, 2018: Biochimica et Biophysica Acta
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