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Adsorption

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https://www.readbyqxmd.com/read/28107756/photocatalytic-reduction-of-cs-i-ions-removed-by-combined-maghemite-titania-pva-alginate-beads-from-aqueous-solution
#1
Zohreh Majidnia, Mohamad Ali Fulazzaky
The presence of Cs(I) ions in nuclear wastewater becomes an important issue for the reason of its high toxicity. The development of adsorbent embedded metal-based catalysts that has sufficient adsorption capacity is expected for the removal of Cs(I) ions from contaminated water. This study tested the use of maghemite, titania and combined maghemite-titania polyvinyl alcohol (PVA)-alginate beads as an adsorbent to remove Cs(I) ions from aqueous solution with the variables of pH and initial concentration using batch experiments under sunlight...
January 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28107723/novel-recyclable-adsorbent-for-the-removal-of-copper-ii-and-lead-ii-from-aqueous-solution
#2
Yaolan Niu, Kan Li, Diwen Ying, Yalin Wang, Jinping Jia
Adsorbents synthesized with biopolymer have been widely used in the removal of toxic metal ions. Novel high-efficiency, recyclable, and low-cost adsorbents have received more and more attention. Chitosan and cellulose are the most abundant biopolymers in nature. Composite modified adsorbent (CSTEC) was synthesized as novel fibrous materials for the adsorption of Cu(2+) and Pb(2+) ions from water in this study. The functional fiber was characterized to investigate the surface appearance, functional groups, crystallinity, and thermal stability...
January 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107721/increased-biohydrogen-yields-volatile-fatty-acid-production-and-substrate-utilisation-rates-via-the-electrodialysis-of-a-continually-fed-sucrose-fermenter
#3
Rhys Jon Jones, Jaime Massanet-Nicolau, Martijn J J Mulder, Giuliano Premier, Richard Dinsdale, Alan Guwy
Electrodialysis (ED) removed volatile fatty acids (VFAs) from a continually-fed, hydrogen-producing fermenter. Simultaneously, electrochemical removal and adsorption removed gaseous H2 and CO2, respectively. Removing VFAs via ED in this novel process increased H2 yields by a factor of 3.75 from 0.24molH2mol(-1)hexose to 0.90molH2mol(-1)hexose. VFA production and substrate utilisation rates were consistent with the hypothesis that end product inhibition arrests H2 production. The methodology facilitated the recovery of 37g of VFAs, and 30L H2 that was more than 99% pure, both of which are valuable, energy dense chemicals...
January 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28107712/innovative-solidification-stabilization-of-lead-contaminated-soil-using-incineration-sewage-sludge-ash
#4
Jiangshan Li, Chi Sun Poon
The proper treatment of lead (Pb) contaminated soils and incinerated sewage sludge ash (ISSA) has become an environmental concern. In this study, ordinary Portland cement (OPC) and blended OPC containing incinerated sewage sludge ash (ISSA) were used to solidify/stabilize (S/S) soils contaminated with different concentrations of Pb. After curing for 7 and 28 d, the S/S soils were subjected to a series of strength, leaching and microscopic tests. The results showed that replacement of OPC by ISSA significantly reduced the unconfined compressive strength (UCS) of S/S soils and leached Pb...
January 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107708/acid-base-treated-vermiculite-as-high-performance-adsorbent-insights-into-the-mechanism-of-cationic-dyes-adsorption-regeneration-recyclability-and-stability-studies
#5
Wojciech Stawiński, Agnieszka Węgrzyn, Tomasz Dańko, Olga Freitas, Sónia Figueiredo, Lucjan Chmielarz
Additional treatment with NaOH of acid activated vermiculite results in even higher increase in the adsorption capacity in comparison to samples modified only in acidic solution (first step of activation) with respect to raw material. Optimization of treatment conditions and adsorption capacity for two cationic dyes (methylene blue (MB) and astrazon red (AR)), also as binary mixture, was evaluated. The capacity, based on column studies, increased from 48 ± 2 to 203 ± 4 mg g(-1) in the case of methylene blue and from 51 ± 1 to 127 ± 2 mg g(-1) in the case of astrazon red on starting and acid-base treated material, respectively...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28107619/peptide-based-stealth-nanoparticles-for-targeted-and-ph-triggered-delivery
#6
Alessandro Ranalli, Melissa Santi, Luigi Capriotti, Valerio Voliani, David Porciani, Fabio Beltram, Giovanni Signore
Stealth agents are extensively investigated as means to prolong nanostructures residence time in the bloodstream by avoiding uptake by the reticuloendothelial system. Unfortunately, commonly used agents such as poly(ethylene glycol) can adversely impact on targeting efficiency and promote immune reaction by the host organism. Therefore, there is an increasing interest in developing biocompatible, non-PEGylated organic nanostructures able to perform targeted delivery, to increase the efficacy of liposomal technology...
January 20, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28107618/carbon-hollow-microspheres-with-a-designable-mesoporous-shell-for-high-performance-electromagnetic-wave-absorption
#7
Hailong Xu, Xiaowei Yin, Meng Zhu, Meikang Han, Zexin Hou, Xinliang Li, Litong Zhang, Laifei Cheng
In this work, mesoporous carbon hollow microspheres (PCHMs) with designable mesoporous shell and interior void are constructed by a facile in situ stöber templating approach and a pyrolysis-etching process. The PCHMs are characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, Raman, nitrogen adsorption and desorption system. A uniform mesoporous shell (pore size 4.7 nm) with a thickness of 55 nm and a cavity size of 345 nm is realized. The composite of paraffin mixed with 20 wt...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28107440/new-composites-lnbdc-ac-and-cb-6-ac-from-design-toward-selective-adsorption-of-methylene-blue-or-methyl-orange
#8
Guilherme de C Santos, Amanda L Barros, Carlos A F de Oliveira, Leonis L da Luz, Fausthon F da Silva, Grégoire J-F Demets, Severino Alves Júnior
New porous composites LnBDC@AC (AC = Activated carbon, Ln = Eu and Gd and BDC = 1,4-benzenedicaboxylate) and CB[6]@AC (CB[6] = Cucurbit[6]uril) were obtained using hydrothermal route. The LnBDC and CB[B] are located inside the pore of the carbon materials as was observed in SEM-EDS, XRPD and FT-IR analysis. Porosimetry analysis showed values typically between AC and LnBDC material, with pore size and surface area, respectively, 29,56 Å and 353.98 m2g-1 for LnBDC@AC and 35,53 Å and 353.98 m2g-1 for CB[6]@AC...
2017: PloS One
https://www.readbyqxmd.com/read/28107018/structure-wettability-and-thermal-stability-of-organic-thin-films-on-gold-generated-from-the-molecular-self-assembly-of-unsymmetrical-oligo-ethylene-glycol-spiroalkanedithiols
#9
Pawilai Chinwangso, Han Ju Lee, Andrew C Jamison, Maria D Marquez, Chul Soon Park, T Randall Lee
Organic thin-films on gold were prepared from a set of new, custom-designed bidentate alkanethiols possessing a mixture of normal alkane and methoxy-terminated tri(ethyleneglycol) chains. The new unsymmetrical spiroalkanedithiol adsorbates were of the form [CH3O(CH2CH2O)3(CH2)5]-[CH3(CH2)n+1]C[CH2SH]2 where n = 3 and 14; designated EG3C7-C7 and EG3C7-C18, respectively. Their corresponding self-assembled monolayers (SAMs) on gold were characterized and compared with monothiol SAMs derived from an analogous normal alkanethiol (C18SH) and an alkanethiol terminated with an oligo(ethylene glycol) (OEG) moiety (i...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28106988/factors-governing-the-performance-of-bauxite-for-fluoride-remediation-of-groundwater
#10
Aruna Kirani Katyayani Cherukumilli, Caroline Delaire, Susan E Amrose, Ashok J Gadgil
Globally, 200 million people drink groundwater contaminated with fluoride concentrations exceeding the World Health Organization's recommended level (WHO-MCL =1.5 mg F-/L). This study investigates the use of minimally-processed (dried/milled) bauxite ore as an inexpensive adsorbent for remediating fluoride-contaminated groundwater in resource-constrained areas. Adsorption experiments in synthetic groundwater using bauxites from Guinea, Ghana, USA, and India as single-use batch dispersive media demonstrated that doses of ~10-23 g/L could effectively remediate 10 mg F-/L...
January 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28106984/pore-space-partition-in-metal-organic-frameworks
#11
Quan-Guo Zhai, Xianhui Bu, Xiang Zhao, Dong-Sheng Li, Pingyun Feng
Metal-organic framework (MOF) materials have emerged as one of the favorite crystalline porous materials (CPM) because of their compositional and geometric tunability and many possible applications. In efforts to develop better MOFs for gas storage and separation, a number of strategies including creation of open metal sites and implantation of Lewis base sites have been used to tune host-guest interactions. In addition to these chemical factors, the geometric features such as pore size and shape, surface area, and pore volume also play important roles in sorption energetics and uptake capacity...
January 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28106979/li-ion-localization-and-energetics-as-a-function-of-anode-structure
#12
Nicholas William McNutt, Marshall T McDonnell, Orlando Rios, David J Keffer
In this work, we study the effect of carbon composite anode structure on the localization and energetics of Li-ions. A computational molecular dynamics study is combined with experimental results from neutron scattering experiments to understand the effect of composite density, crystallite size, volume fraction of crystalline carbon, and ion loading on the nature of ion storage in novel, lignin-derived composite materials. In a recent work1, we demonstrated that these carbon composites display a fundamentally different mechanism for Li-ion storage than traditional graphitic anodes...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106977/correction-to-synthesis-of-%C3%AE-cyclodextrin-based-electrospun-nanofiber-membranes-for-highly-efficient-adsorption-and-separation-of-methylene-blue
#13
Rui Zhao, Yong Wang, Xiang Li, Bolun Sun, Ce Wang
No abstract text is available yet for this article.
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106456/interplay-between-adsorption-and-hydrodynamics-in-nanochannels-towards-tunable-membranes
#14
Sela Samin, René van Roij
We study how the adsorption of a near-critical binary mixture in a nanopore is modified by flow inside the pore. We identify three types of steady states upon variation of the pore Péclet number (Pe_{p}), which can be reversibly accessed by the application of an external pressure. Interestingly, for small Pe_{p} the pore acts as a weakly selective membrane which separates the mixture. For intermediate Pe_{p}, the flow effectively shifts the adsorption in the pore, thereby opening possibilities for enhanced and tunable solute transport through the pore...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106419/probing-the-nodal-structure-of-landau-level-wave-functions-in-real-space
#15
J R Bindel, J Ulrich, M Liebmann, M Morgenstern
The inversion layer of p-InSb(110) obtained by Cs adsorption of 1.8% of a monolayer is used to probe the Landau level wave functions within smooth potential valleys by scanning tunneling spectroscopy at 14 T. The nodal structure becomes apparent as a double peak structure of each spin polarized first Landau level, while the zeroth Landau level exhibits a single peak per spin level only. The real space data show single rings of the valley-confined drift states for the zeroth Landau level and double rings for the first Landau level...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106380/role-of-sputter-deposition-rate-in-tailoring-nanogranular-gold-structures-on-polymer-surfaces
#16
Matthias Schwartzkopf, Alexander Hinz, Oleksandr Polonskyi, Thomas Strunskus, Franziska Carina Löhrer, Volker Körstgens, Peter Muller-Buschbaum, Franz Faupel, Stephan V Roth
The reproducible low-cost fabrication of functional polymer-metal-interfaces via self-assembly is of crucial importance in organic electronics and organic photovoltaics. In particular, submonolayer and nanogranular systems expose highly interesting electrical, plasmonic and catalytical properties. The exploitation of their great potential requires tailoring of the structure on the nanometer scale and below. In order to obtain full control over the complex nanostructural evolution at the polymer-metal interface, we monitor the evolution of the metallic layer morphology with in situ time-resolved GISAXS during sputter deposition...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106369/sponge-like-porous-silica-nanosheets-from-soft-molecular-trapping-to-dna-delivery
#17
Qingmin Ji, Tomohiko Yamazaki, Jiao Sun, Żaneta Górecka, Nien-Chi Huang, Shan-Hui Hsu, Lok Kumar Shrestha, Jonathan P Hill, Katsuhiko Ariga
Sponge-like porous silica nanosheets having nanometer thicknesses and possess pores whose diameters are on the hundreds-of-nanometers scale have been used as a novel carrier for molecular immobilization of different guests. Enhanced properties of encapsulation were shown for drug molecules of different dimensions due to "softness" caused by the specific nanometric features of the porous structure. The encapsulating effect of the structure results in sustained and stimuli-responsive release behavior of immobilized guest molecules...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106368/programmable-shape-recovery-process-of-water-responsive-shape-memory-polyvinyl-alcohol-by-wettability-contrast-strategy
#18
Zhiqiang Fang, Yudi Kuang, Panpan Zhou, Siyi Ming, Penghui Zhu, Yu Liu, Honglong Ning, Gang Chen
Water-responsive shape memory polymers (SMPs) are desirable for biomedical applications, but their limited shape recovery process is problematic. Herein, we demonstrate a shape-memory polyvinyl alcohol (SM-PVA) with programmable multi-step shape recovery processes in water via a wettability contrast strategy. A hexamethyldisilazane (HMDS)-treated SiO2 nanoparticle layer with varying loading weights was rationally deposited onto the surface of SM-PVA, aiming to create surface-wettability contrast. The varying wettability led to different water adsorption behaviors of SM-PVA that could be well described by the pseudo-first-order kinetic model...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106341/photocontrolled-extraction-of-uric-acid-from-biological-samples-based-on-photoresponsive-surface-molecularly-imprinted-polymer-microspheres
#19
Cheng-Bin Gong, Zai-Yong Li, Lan-Tao Liu, Yu-Bu Wei, Xia Yang, Cheuk-Fai Chow, Qian Tang
We aim to develop novel photoresponsive surface molecularly imprinted polymer microspheres, a SiO2 -surface molecularly imprinted polymer, for the photocontrolled extraction of uric acid from biological samples. The SiO2 -surface molecularly imprinted polymer was prepared on silica microspheres by surface polymerization and characterized by using scanning electron microscopy, transmission electron microscopy, FTIR spectroscopy, thermogravimetric analysis, nitrogen adsorption-desorption analysis, and UV-visible spectroscopy...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28106214/copper-nanoparticle-interspersed-mos2-nanoflowers-with-enhanced-efficiency-for-co2-electrochemical-reduction-to-fuel
#20
Guodong Shi, Luo Yu, Xin Ba, Xiaoshu Zhang, Jianqing Zhou, Ying Yu
Electrocatalytic conversion of carbon dioxide (CO2) has been considered as an ideal method to simultaneously solve the energy crisis and environmental issue around the world. In this work, ultrasmall Cu nanoparticle interspersed flower-like MoS2 was successfully fabricated via a facile microwave hydrothermal method. The designed optimal hierarchical Cu/MoS2 composite not only exhibited remarkably enhanced electronic conductivity and specific surface area but also possessed improved CO2 adsorption capacity, resulting in a significant increase in overall faradaic efficiency and a 7-fold augmentation of the faradaic efficiency of CH4 in comparison with bare MoS2...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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