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Adsorption

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https://www.readbyqxmd.com/read/27914349/effects-of-clay-minerals-hydroxides-and-timing-of-dissolved-organic-matter-addition-on-the-competitive-sorption-of-copper-nickel-and-zinc-a-column-experiment
#1
Yasser Refaey, Boris Jansen, John R Parsons, Pim de Voogt, Simone Bagnis, Adriaan Markus, Abdel-Hamid El-Shater, Abdel-Aziz El-Haddad, Karsten Kalbitz
Infiltration of heavy metal (HM) polluted wastewater can seriously compromise soil and groundwater quality. Interactions between mineral soil components (e.g. clay minerals) and dissolved organic matter (DOM) play a crucial role in determining HM mobility in soils. In this study, the influence of the timing of addition of DOM, i.e. concurrent with or prior to HMs, on HM mobility was explored in a set of continuous flow column experiments using well defined natural soil samples amended with goethite, birnessite and/or smectite...
November 30, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27914340/nickelocene-as-precursor-of-microporous-organometallic-derived-carbon-and-nickel-oxide-carbon-nanocomposite
#2
P González-García, D Arenas-Esteban, D Ávila-Brande, E Urones-Garrote, L C Otero-Díaz
Microporous flower-like and spherical carbon particles, made of graphene-like layers, have been obtained via chlorination of nickelocene (Ni(C5H5)2). Their mechanism of formation, in terms of morphology and micro-nanostructure, has been followed from 200 to 900°C. Conventional transmission electron microscopy and high-resolution-TEM observations allow determining that their structure is made of highly disordered graphene-like layers. The Raman spectrum of the high temperature sample exhibits the characteristics D and G bands...
November 10, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27914333/nano-zinc-oxide-incorporated-graphene-oxide-nanocellulose-composite-for-the-adsorption-and-photo-catalytic-degradation-of-ciprofloxacin-hydrochloride-from-aqueous-solutions
#3
T S Anirudhan, J R Deepa
Purpose of this study is to report the synthetic procedure of a novel photo catalyst, nano zinc oxide incorporated graphene oxide/nanocellulose (ZnO-GO/NC) for the effective adsorption and subsequent photo degradation of ciprofloxacin (CF), an antibiotic widely used in the poultry. Self cleaning property in cellulose was achieved by introducing a nano zinc oxide incorporated graphene oxide into nanocellulose (NC) matrix. By incorporating nano zinc oxide (ZnO) in graphene oxide (GO), band gap could be tuned to 2...
November 17, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27914081/negative-staining-and-transmission-electron-microscopy-of-bacterial-surface-structures
#4
Matthias Mörgelin
Negative staining is an essential and versatile staining technique in transmission electron microscopy that can be employed for visualizing bacterial cell morphology, size, and surface architecture at high resolution. Bacteria are usually transferred by passive electrostatic adsorption from suspensions in physiological saline onto suitable hydrophilic support films on electron microscopic grids. There they are contrasted, or "stained," by heavy metal ions in solution such as tungsten, uranyl, molybdate, or vanadate compounds...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27913906/synergistic-mitotoxicity-of-chloromethanes-and-fullerene-c60-nanoaggregates-in-daphnia-magna-midgut-epithelial-cells
#5
Mariana Seke, Milica Markelic, Arian Morina, Danica Jovic, Aleksandra Korac, Dragana Milicic, Aleksandar Djordjevic
Adsorption of non-polar compounds by suspended fullerene nanoaggregates (nC60) may enhance their toxicity and affect the fate, transformation, and transport of non-polar compounds in the environment. The potential of stable fullerene nanoaggregates as contaminant carriers in aqueous systems and the influence of chloromethanes (trichloromethane and dichloromethane) were studied on the midgut epithelial cells of Daphnia magna by light and electron microscopy. The size and shape of fullerene nanoaggregates were observed and measured using dynamic light scattering, transmission electron microscopy, and low vacuum scanning electron microscopy...
December 3, 2016: Protoplasma
https://www.readbyqxmd.com/read/27913854/the-role-of-macromolecules-in-the-formation-of-kidney-stones
#6
REVIEW
Jeffrey D Rimer, Ann M Kolbach-Mandel, Michael D Ward, Jeffrey A Wesson
The formation of crystal aggregates, one of the critical processes in kidney stone pathogenesis, involves interactions between crystals (predominantly calcium oxalate monohydrate, COM) and urinary constituents (e.g., proteins), which serve as an adhesive "glue" between crystals in stones. To develop a better understanding of the protein-crystal interactions that lead to crystal aggregation, we have measured the effect of model proteins on bulk COM crystal properties as well as their adsorption on crystal surfaces using three synthetic polyanions: poly(aspartic acid) (polyD), poly(glutamic acid) (polyE), and poly(acrylic acid) (polyAA)...
December 2, 2016: Urolithiasis
https://www.readbyqxmd.com/read/27913172/efficient-catalytic-system-for-the-direct-transformation-of-lignocellulosic-biomass-to-furfural-and-5-hydroxymethylfurfural
#7
Luxin Zhang, Guoyun Xi, Jiaxin Zhang, Hongbing Yu, Xiaochang Wang
A feasible approach was developed for the co-production of 5-hydroxymethylfurfural (5-HMF) and furfural from corncob via a new porous polytriphenylamine-SO3H (SPTPA) solid acid catalyst in lactone solvents. XRD, SEM, XPS, N2 adsorption-desorption, elemental analysis, TG-DTA, acid-base titration and FTIR spectroscopy techniques were used to characterize the catalyst. This study demonstrates and optimizes the catalytic performance of SPTPA and solvent selection. SPTPA was found to exhibit superior catalytic ability in γ-valerolactone (GVL)...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27913083/different-biosorption-mechanisms-of-uranium-vi-by-live-and-heat-killed-saccharomyces-cerevisiae-under-environmentally-relevant-conditions
#8
Tieshan Wang, Xinyan Zheng, Xiaoyu Wang, Xia Lu, Yanghao Shen
Uranium adsorption mechanisms of live and heat-killed Saccharomyces cerevisiae in different pH values and biomass concentrations were studied under environmentally relevant conditions. Compared with live cells, the adsorption capacity of heat-killed cells is almost one order of magnitude higher in low biomass concentration and highly acidic pH conditions. To explore the mesoscopic surface interactions between uranium and cells, the characteristic of uranium deposition was investigated by SEM-EDX, XPS and FTIR...
November 29, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27912192/lab-based-investigation-of-enhanced-btex-attenuation-driven-by-groundwater-table-fluctuation
#9
Y S Yang, Panpan Li, Xi Zhang, Mingjie Li, Ying Lu, Bin Xu, Tong Yu
Groundwater fluctuation is often overlooked and lack of study in the field contaminant hydrogeology. Hydraulic force from fluctuating groundwater tables leads to dissolution and subsequent enhanced advective transport of petroleum (e.g. BTEX) in contaminated subsurface system. A laboratory investigation of effect of the groundwater table fluctuation (GTF) on BTEX transport, taking toluene as a typical compound, in a typical representative model of aquifers subjected to a daily water-table fluctuation was undertaken in this work...
November 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/27912177/raman-spectroscopy-and-quantum-mechanical-analysis-of-tautomeric-forms-in-cytosine-and-5-methylcytosine-on-gold-surfaces
#10
Dinh Bao Nguyen, Thanh Danh Nguyen, Sangsoo Kim, Sang-Woo Joo
Spectral differences between cytosine (Cyt) and 5-methylcytosine (5MC) were investigated by means of Raman spectroscopy with a combination of density functional theory (DFT) calculations. Surface-enhanced Raman scattering (SERS) revealed discriminating peaks of 5MC from those of Cyt upon adsorption on gold nanoparticles (AuNPs). Among the notable features, the multiple bands between 850 and 700cm(-1) for the ring-breathing modes of 5MC and Cyt could be correlated well with the simulated spectra based on the DFT calculations of the adsorbates on the gold cluster atoms...
November 9, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27912125/feooh-graphene-oxide-nanocomposites-for-fluoride-removal-from-water-acetate-mediated-nano-feooh-growth-and-adsorption-mechanism
#11
Liyuan Kuang, Yuyang Liu, Dandan Fu, Yaping Zhao
Fluoride adsorption capacity in water matrices depends highly on the properties of each component of the adsorption system, the most important one of these is the physchemical properties of the adsorbent. Nanoparticle Goethite anchored onto graphene oxide (FeOOH+Ac/GO) and rice spike-like Akaganeite anchored onto graphene oxide (FeOOH/GO) were synthesized via an in-situ hydrolysis procedure and compared their fluoride adsorption performances in order to address the effect of crystalline structure growth induced by acetate sodium (NaAc), one important organic ligand in water and soil...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912123/synthesis-of-hierarchical-porous-zinc-oxide-zno-microspheres-with-highly-efficient-adsorption-of-congo-red
#12
Chunsheng Lei, Meng Pi, Chuanjia Jiang, Bei Cheng, Jiaguo Yu
Hierarchical porous zinc oxide (ZnO) was successfully synthesized via a facile hydrothermal method followed by calcination, and characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption, and Fourier transform infrared spectroscopy analyses. The as-prepared porous ZnO exhibits microsphere morphologies with diameters of 6-8μm, which are assembled from two-dimensional nanosheets. The as-prepared hierarchical porous ZnO microspheres possessed high specific surface areas (57m(2)/g), and were evaluated for adsorption of Congo red (CR) in aqueous solution...
November 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912122/ring-like-structured-chitosan-metal-hydrogel-mass-production-formation-mechanism-and-applications
#13
Hao Zhou, LiLi Xu, Yuezhong Wen, Kunde Lin, Xiaomei Zeng
To improve the solid/liquid separation of chitosan adsorbents as well as the adsorption ability, chitosan was molded in several shapes. However, the ring-like structures of chitosan which have relatively larger surface area and higher chemical accessibility, but low-pressure drops than their plate-like counterparts has not been reported. In this study, we put forward a novel concept to fabricate a kind of highly efficient ring-like structured chitosan hydrogel through a sulfate ionic crosslinking method, its mass production and formation mechanism has been fully proposed...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912114/remediation-of-cr-vi-by-inorganic-organic-clay
#14
Suramya I Rathnayake, Wayde N Martens, Yunfei Xi, Ray L Frost, Godwin A Ayoko
Application of inorganic-organic clays (IOCs) for the remediation of hexavalent chromium (Cr (VI)) and the effect of bisphenol-A (BPA) were investigated. IOCs were better adsorbents for the removal of Cr (VI) than organoclay. Solution pH significantly affected the surface charge of IOCs and speciation of Cr in the solution; hence, the adsorption of Cr onto IOCs. Pseudo-second order model and Langmuir model were the best fit for the kinetics and equilibrium data, indicating chemisorption and formation of monolayer on homogenous adsorption sites, respectively...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912113/titanium-dioxide-and-cadmium-sulfide-co-sensitized-graphitic-carbon-nitride-nanosheets-composite-photocatalysts-with-superior-performance-in-phenol-degradation-under-visible-light-irradiation
#15
Jinhua Yao, Huan Chen, Fang Jiang, Zhongyi Jiao, Mingchang Jin
In this work, TiO2-CdS-gCNNSs heterojunction photocatalysts were successfully synthesized. CdS was deposited on the surface of gCNNSs via electrostatic attraction; TiOC, TiOCO and TiON bonds were produced in TiO2-CdS-gCNNSs, strengthening the interaction between TiO2 and gCNNSs. The TiO2-CdS-gCNNSs photocatalyst showed excellent photocatalytic activity for phenol degradation under visible-light irradiation, which was higher than that of CdS-gCNNSs, CdS-TiO2 and TiO2-gCNNSs. The improved photocatalytic performance of TiO2-CdS-gCNNSs was ascribed to more adsorption sites, enhanced light harvesting ability and effective separation rate of electron-hole pairs...
November 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912099/citrate-enhanced-release-of-arsenic-during-pyrite-oxidation-at-circumneutral-conditions
#16
Peng Zhang, Weiyu Yao, Songhu Yuan
The release of arsenic (As) from the oxidation of As-rich pyrite is an important source of the high arsenic in groundwater. As a widespread low-molecular-weight organic acid, citrate plays an important role on the cycling of Fe(II)/Fe(III) through complexation in circumneutral subsurface environments, while the influence of citrate on the release of As from the oxidation of As-rich pyrite is poorly understood. In this study, As was loaded onto pyrite particles under anoxic conditions, and its release was investigated in the presence of 0-1 mM citrate at pH 7...
November 24, 2016: Water Research
https://www.readbyqxmd.com/read/27911906/adsorptive-removal-of-toxic-chromium-from-waste-water-using-wheat-straw-and-eupatorium-adenophorum
#17
Dagang Song, Kaiwen Pan, Akash Tariq, Azizullah Azizullah, Feng Sun, Zilong Li, Qinli Xiong
Environmental pollution with heavy metals is a serious issue worldwide posing threats to humans, animals and plants and to the stability of overall ecosystem. Chromium (Cr) is one of most hazardous heavy metals with a high carcinogenic and recalcitrant nature. Aim of the present study was to select low-cost biosorbent using wheat straw and Eupatorium adenophorum through simple carbonization process, capable of removing Cr (VI) efficiently from wastewater. From studied plants a low cost adsorbent was prepared for removing Cr (VI) from aqueous solution following very simple carbonization method excluding activation process...
2016: PloS One
https://www.readbyqxmd.com/read/27911849/scalable-manufacturing-of-biomimetic-moldable-hydrogels-for-industrial-applications
#18
Anthony C Yu, Haoxuan Chen, Doreen Chan, Gillie Agmon, Lyndsay M Stapleton, Alex M Sevit, Mark W Tibbitt, Jesse D Acosta, Tony Zhang, Paul W Franzia, Robert Langer, Eric A Appel
Hydrogels are a class of soft material that is exploited in many, often completely disparate, industrial applications, on account of their unique and tunable properties. Advances in soft material design are yielding next-generation moldable hydrogels that address engineering criteria in several industrial settings such as complex viscosity modifiers, hydraulic or injection fluids, and sprayable carriers. Industrial implementation of these viscoelastic materials requires extreme volumes of material, upwards of several hundred million gallons per year...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911418/synthesis-and-characterization-of-fe-doped-aluminosilicate-nanotubes-with-enhanced-electron-conductive-properties
#19
Ehsan Shafia, Serena Esposito, Elnaz Bahadori, Marco Armandi, Maela Manzoli, Barbara Bonelli
The goal of the protocol is to synthesize Fe-doped aluminosilicate nanotubes of the imogolite type with the formula (OH)3Al2-xFexO3SiOH. Doping with Fe aims at lowering the band gap of imogolite, an insulator with the chemical formula (OH)3Al2O3SiOH, and at modifying its adsorption properties towards azo-dyes, an important class of organic pollutants of both wastewater and groundwater. Fe-doped nanotubes are obtained in two ways: by direct synthesis, where FeCl3 is added to an aqueous mixture of the Si and Al precursors, and by post-synthesis loading, where preformed nanotubes are put in contact with a FeCl3•6H2O aqueous solution...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911362/automated-acoustic-dispensing-for-the-serial-dilution-of-peptide-agonists-in-potency-determination-assays
#20
Jacqueline Naylor, Alessandra Rossi, Christopher Brankin, David C Hornigold
As with small molecule drug discovery, screening for peptide agonists requires the serial dilution of peptides to produce concentration-response curves. Screening peptides affords an additional layer of complexity as conventional tip-based sample handling methods expose peptides to a large surface area of plasticware, providing an increased opportunity for peptide loss via adsorption. Preventing excessive exposure to plasticware reduces peptide loss via adherence to plastics and thus minimizes inaccuracies in potency prediction, and we have previously described the benefits of non-contact acoustic dispensing for in vitro high-throughput screening of peptide agonists(1)...
November 10, 2016: Journal of Visualized Experiments: JoVE
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