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https://www.readbyqxmd.com/read/28454479/in-situ-immobilization-on-the-silica-gel-surface-and-adsorption-capacity-of-poly-n-4-carboxyphenyl-methacrylamide-on-toxic-metal-ions
#1
Elina Yanovska, Irina Savchenko, Dariusz Sternik, Olga Kychkiruk, Lidiya Ol'khovik, Iana Buriachenko
In situ immobilization of poly[N-(4-carboxyphenyl)methacrylamide] has been performed on silica gel surface. Infrared (IR) and mass spectroscopies as well as thermogravimetry (TG) analysis have been used to elucidate the structure of immobilized polymer. An adsorption capacity of the synthesized composite towards Cu(II), Pb(II), Mn(II), Fe(III), Co(II), and Ni(II) ions has been estimated. Adsorption activity to microquantities of Pb(II), Cu(II), and Ni(II) in a neutral aqueous medium has been observed.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454076/carbazole-based-nanoprobe-for-selective-recognition-of-fe-3-ion-in-aqueous-medium-spectroscopic-insight
#2
Sonali B Suryawanshi, Prasad G Mahajan, Anita J Bodake, Govind B Kolekar, Shivajirao R Patil
A simple carbazole based nanoprobe prepared by reprecipitation method shows selective sensing behavior for Fe(3+) ion in aqueous medium. The prepared SDS capped 9-phenyl carbazole nanoparticles (9-PCzNPs) has narrower particle size distribution with an average diameter 35nm and zeta potential of -34.3mV predicted a good stability with negative surface charge over the nanoparticles. The Field Emission Scanning Electron Microscopy (FE-SEM) image showed cubic shape morphology of nanoparticles. The aqueous suspension of SDS capped 9-phenyl carbazole nanoparticles exhibited aggregation induced enhanced red shifted intense emission in comparison with the emission arising from dilute solution of 9-phenyl carbazole in DCM...
April 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28454022/quantitative-analysis-of-adsorptive-interactions-of-ionic-and-neutral-pharmaceuticals-and-other-chemicals-with-the-surface-of-escherichia-coli-cells-in-aquatic-environment
#3
Chul-Woong Cho, Jeong-Soo Park, Yufeng Zhao, Yeoung-Sang Yun
Since Escherichia coli is ubiquitous in nature and has been applied to biological, chemical, and environmental processes, molecular-level understanding of adsorptive interactions between chemicals and the bacterial surface is of great importance. To characterise the adsorption properties of the surface of E. coli cells in aquatic environment, the binding affinities (log Kd) of calibration compounds were experimentally measured, and then based on the values and numerically well-defined molecular interaction forces, i...
April 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28454019/adsorption-of-carbon-dots-onto-al2o3-in-aqueous-experimental-and-theoretical-studies
#4
Xia Liu, Jiaxing Li, Xiaohua Wu, Zhi Zeng, Xianlong Wang, Tasawar Hayat, Xiaodong Zhang
Increasing interests in carbon dots (CDs) research resulted in the increased production of CDs and the risk to be released into the environment, including surface water and groundwater. To assess the environmental behavior of CDs, the stability of CDs in aqueous solutions were first examined by different environmental conditions, followed by the systematic investigation of the adsorption behaviors of CDs onto Al2O3 surface. Electrostatic interactions were considered as the dominant forces in CDs adsorption onto Al2O3 process, which were further confirmed by controlling experiments as compared with other minerals or oxides, such as montmorillonite, kaolinite and SiO2...
April 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28454007/groundwater-remediation-from-the-past-to-the-future-a-bibliometric-analysis
#5
Shu Zhang, Guozhu Mao, John Crittenden, Xi Liu, Huibin Du
Groundwater is an important component of terrestrial ecosystems and plays a role in geochemical cycling. Groundwater is also used for agricultural irrigation and for the domestic supply of drinking water in most nations. However, groundwater contamination has led to many research efforts on groundwater remediation technologies and strategies. This study evaluated a total of 5486 groundwater remediation-related publications from 1995 to 2015 using bibliometric technology and social network analysis, to provide a quantitative analysis and a global view on the current research trend and future research directions...
January 19, 2017: Water Research
https://www.readbyqxmd.com/read/28453989/recovery-of-lithium-from-the-effluent-obtained-in-the-process-of-spent-lithium-ion-batteries-recycling
#6
Xueyi Guo, Xiao Cao, Guoyong Huang, Qinghua Tian, Hongyu Sun
A novel process of lithium recovery as lithium ion sieve from the effluent obtained in the process of spent lithium-ion batteries recycling is developed. Through a two-stage precipitation process using Na2CO3 and Na3PO4 as precipitants, lithium is recovered as raw Li2CO3 and pure Li3PO4, respectively. Under the best reaction condition (both the amounts of Na2CO3 and Li3PO4vs. the theoretical ones are about 1.1), the corresponding recovery rates of lithium (calculated based on the concentration of the previous stage) are 74...
April 25, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28453982/effect-of-microstructure-and-surface-hydroxyls-on-the-catalytic-activity-of-au-alooh-for-formaldehyde-removal-at-room-temperature
#7
Zhaoxiong Yan, Zhihua Xu, Jiaguo Yu, Mietek Jaroniec
A series of Au/AlOOH catalysts was prepared by impregnating different AlOOH supports with Au precursor followed by NaBH4-assisted reduction, and examined their activity toward oxidation of indoor formaldehyde (HCHO) pollutant at room temperature. The AlOOH supports used were synthesized by microemulsion, microwave and hydrothermal methods. Among these supports the catalyst obtained by deposition of Au nanoparticles (NPs) on AlOOH prepared by microemulsion method (Au/AlOOH-m) exhibited the highest catalytic activity...
April 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28453965/adsorption-behavior-and-mechanism-of-different-arsenic-species-on-mesoporous-mnfe2o4-magnetic-nanoparticles
#8
Qingsong Hu, Yuling Liu, Xueyuan Gu, Yaping Zhao
Arsenic pollution poses severe threat to human health, therefore dealing with the problem of arsenic contamination in water bodies is extremely important. The adsorption behaviors of different arsenic species, such as arsenate (As(V)), p-arsanilic acid (p-ASA), roxarsone (ROX), dimethylarsenate (DMA) from water using mesoporous bimetal oxide magnetic manganese ferrite nanoparticles (MnFe2O4) have been detailedly investigated. The adsorbent was synthesized via a facile co-precipitation approach and recovered conveniently owing to its strong magnetic properties...
April 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28453279/monte-carlo-simulations-of-the-uptake-of-chiral-compounds-on-solid-surfaces
#9
Stavros Karakalos, Francisco Zaera
A Monte Carlo algorithm was developed and used to describe and explain previous experimental results associated with the kinetics of the uptake of chiral molecules on solid surfaces. The specific system simulated in this study is the adsorption of propylene oxide (PO) on Pt(111) surfaces. The surface was represented by a square lattice, and the time evolution of the adsorption, starting from a clean surface, was simulated via a number of sequential events chosen using a stochastic approach based on the so-called Master equation and derived from the formalism advanced by Gillespie...
April 28, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28453254/gene-transfection-mediated-by-catiomers-requires-free-highly-charged-polymer-chains-to-overcome-intracellular-barriers
#10
Lindomar Jose Calumby Albuquerque, Carlos E de Castro, Karin A Riske, Maria Cristina Carlan da Silva, Paulo I R Muraro, Vanessa Schmidt Giacomelli, Cristiano Giacomelli, Fernando Carlos Carlos Giacomelli
The prospective use of the block copolymers PEO113-b-PDEA50 and POEGMA70-b-P(OEGMA10-co-DEA47-co-DPA47) as non-viral gene vectors was evaluated. The polymers are able to properly condense DNA into nano-sized particles (RH ~ 75 nm) which are marginally cytotoxic and can be uptaken by cells. However, the GFP expression assays evidenced that DNA delivery is essentially negligible meaning that intracellular trafficking hampers efficient gene release. Subsequently we demonstrate that cellular uptake and particularly the quantity of GFP-positive cells are substantially enhanced when the block copolymer polyplexes are produced and further supplemented by BPEI chains (branched polyethyleneimine)...
April 28, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28453250/correction-to-a-smorgasbord-of-carbon-electrochemical-analysis-of-cobalt-bis-benzenedithiolate-complex-adsorption-and-electrocatalytic-activity-on-diverse-graphitic-supports
#11
Shawn C Eady, Molly M MacInnes, Nicolai Lehnert
No abstract text is available yet for this article.
April 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28449545/structural-variety-and-adsorptive-properties-of-mesoporous-silicas-with-immobilized-oligosaccharide-groups
#12
Iryna Trofymchuk, Nadiia Roik, Lyudmila Belyakova
In this research, we report on the synthesis of mesoporous silicas with various quantities of immobilized oligosaccharide groups and different pore ordering degree. The hydrothermal co-condensation of tetraethyl orthosilicate and β-cyclodextrin-containing organosilane in the presence of cetyltrimethylammonium bromide template was employed. The purpose of this investigation was to show the opportunity of increasing β-cyclodextrin content in silica matrix by changing the molar ratio of initial reagents during organosilane synthesis and to determine whether the enhancing of immobilized groups on the surface influences on model aromatic compound adsorption from water...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449063/extraction-and-determination-of-quercetin-from-ginkgo-biloba-by-dess-based-polymer-monolithic-cartridge
#13
Xiaoqin Wang, Guizhen Li, Kyung Ho Row
Deep eutectic solvents (DES) were formed from choline chloride (ChCl). DES-modified polymer monolithic (DES-M), template molecular polymer monolithic and non-DES-M without a molecular template were synthesized in identical process. These polymer materials were characterized by field emission scanning electron microscopy and Fourier transform infrared spectroscopy. The significant selective adsorption properties of the polymers were assessed by an absorption capacity experiment and solid-phase extraction (SPE)...
April 26, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28448911/adsorption-of-polar-organic-molecules-on-sediments-case-study-on-callovian-oxfordian-claystone
#14
S Rasamimanana, G Lefèvre, R V H Dagnelie
The release and transport of anthropogenic organic matter through the geosphere is often an environmental criterion of safety. Sedimentary rocks are widely studied in this context as geological barriers for waste management. It is the case of Callovian-Oxfordian claystone (COx), for which several studies report adsorption of anthropogenic organic molecules. In this study, we evaluated and reviewed adsorption data of polar organic molecules on COx claystone. Experiments were performed on raw claystone, decarbonated and clay fractions...
April 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448879/adsorption-of-organic-arsenic-acids-from-water-over-functionalized-metal-organic-frameworks
#15
Mithun Sarker, Ji Yoon Song, Sung Hwa Jhung
Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)3) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448834/cmc-prediction-for-ionic-surfactants-in-pure-water-and-aqueous-salt-solutions-based-solely-on-tabulated-molecular-parameters
#16
Stoyan I Karakashev, Stoyan K Smoukov
The critical micelle concentration (CMC) of various surfactants is difficult to predict accurately, yet often necessary to do in both industry and science. Hence, quantum-chemical software packages for precise calculation of CMC were developed, but they are expensive and time consuming. We show here an easy method for calculating CMC with a reasonable accuracy. Firstly, CMC0 (intrinsic CMC, absent added salt) was coupled with quantitative structure - property relationship (QSPR) with defined by us parameter "CMC predictor" f1...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448833/facile-green-synthesis-of-a-co3v2o8-nanoparticle-electrode-for-high-energy-lithium-ion-battery-applications
#17
Vaiyapuri Soundharrajan, Balaji Sambandam, Jinju Song, Sungjin Kim, Jeonggeun Jo, Pham Tung Duong, Seokhun Kim, Vinod Mathew, Jaekook Kim
In the present study, a metal-organic framework (MOF) derived from a facile water-assisted green precipitation technique is employed to synthesize phase-pure cobalt vanadate (Co3V2O8, CVO) anode for lithium-ion battery (LIB) application. The material obtained by this eco-friendly method is systematically characterized using various techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption-desorption measurements...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448832/fabrication-of-a-novel-z-scheme-g-c3n4-bi4o7-heterojunction-photocatalyst-with-enhanced-visible-light-driven-activity-toward-organic-pollutants
#18
Meng Sun, Yu Wang, Yu Shao, Yunhui He, Qi Zeng, Huikai Liang, Tao Yan, Bin Du
In this work, highly efficient g-C3N4/Bi4O7 heterojunction photocatalysts have been successfully fabricated by a facile method. Compared with the bare photocatalysts, the obtained g-C3N4/Bi4O7 hybrid photocatalysts exhibited efficient degradation activity toward methylene blue (MB), phenol, rhodamine B (RhB), and bisphenol A (BPA) under visible light irradiation. The influences of different g-C3N4 contents on the photocatalytic efficiency of the hybrid photocatalysts have been investigated. The results revealed that the g-C3N4/Bi4O7 with g-C3N4 mass ratio of 30% exhibited the best photocatalytic activity...
April 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448142/bottleneck-effect-of-n-n-dimethylformamide-in-inof-1-increasing-co2-capture-in-porous-coordination-polymers
#19
Elí Sánchez-González, Eduardo González-Zamora, Diego Martínez-Otero, Vojtech Jancik, Ilich A Ibarra
The bottleneck effect of confined N,N-dimethylformamide (DMF) molecules was observed in InOF-1 for the first time: CO2 capture was remarkably enhanced in samples of as-synthesized InOF-1, thermally activated in such a way that a small residual amount of DMF molecules remained confined within the pores (DMF@InOF-1). Dynamic CO2 adsorption experiments on DMF@InOF-1 exhibited a CO2 capture of 8.06 wt % [1.5-fold higher than that of a fully activated InOF-1 (5.24%)]. DMF@InOF-1 can reversibly adsorb/desorb 8.09% CO2 with no loss of CO2 capacity after 10 cycles, and the desorption is accomplished by only turning the CO2 flow off...
April 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28448111/stepwise-deprotonation-of-magnetite-supported-gallic-acid-modulates-oxidation-state-and-adsorption-assisted-translocation-of-hexavalent-chromium
#20
Xiaoyu Guan, Yi Chen, Haojun Fan
Recently, a synergistic strategy involving reduction of carcinogenic Cr(VI) into less toxic Cr(III) followed by Cr(III) adsorption and subsequent separation by surface-engineered magnetite nanoparticles has emerged as a promising alternative to address the environmental hazards associated with Cr(VI)-contaminated water. Despite several previous attempts exploiting this synergy, modulating the oxidation state and translocation of Cr(VI) with high spatiotemporal precision remains a major challenge. Here, we report how Cr(VI) responds accordingly in a well-defined manner to deprotonation of gallic acid covalently immobilized on magnetite nanoparticles, which proceeds through a fixed spatial sequence of distinct stages...
April 27, 2017: ACS Applied Materials & Interfaces
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