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https://www.readbyqxmd.com/read/28260379/the-layered-a-2sn3s7%C3%A2-a-organic-cation-as-efficient-ion-exchanger-for-rare-earth-element-recovery
#1
XingHui Qi, Ke-Zhao Du, Mei-Ling Feng, Yu-Jie Gao, Xiao-Ying Huang, Mercouri G Kanatzidis
Exploring new ion-exchangers for the recovery of rare earth elements (REE) and recycling is worthwhile for the high-tech industry and an eco-friendly sustainable economy. The efficient enrichment of low concentration REE from complex aqueous solutions containing large excess of competitive ions is challenging. Here we present a chalcogenide example as a superior REE ion-exchanger efficiently removing them from very complex aqueous solutions, (Me2NH2)1.33(Me3NH)0.67 Sn3S7·1.25H2O (FJSM-SnS). The material exhibits fast and efficient ion exchange behavior with short equilibrium times (<5 min), high adsorption capacity (139 mg/g for Eu, 147 mg/g for Tb, 126 mg/g for Nd), wide pH resistance (1...
March 6, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28254724/fast-algal-eco-toxicity-assessment-influence-of-light-intensity-and-exposure-time-on-chlorella-vulgaris-inhibition-by-atrazine-and-dcmu
#2
Alexandre Camuel, Benoit Guieysse, Cynthia Alcántara, Quentin Béchet
In order to develop a rapid assay suitable for algal eco-toxicity assessments under conditions representative of natural ecosystems, this study evaluated the short-term (<1h) response of algae exposed to atrazine and DCMU using oxygen productivity measurements. When Chlorella vulgaris was exposed to these herbicides under 'standard' low light intensity (as prescribed by OECD201 guideline), the 20min-EC50 values recorded via oxygen productivity (atrazine: 1.32±0.07μM; DCMU: 0.31±0.005μM) were similar the 96-h EC50 recorded via algal growth (atrazine: 0...
February 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28254611/practical-economical-and-eco-friendly-starch-supported-palladium-catalyst-for-suzuki-coupling-reactions
#3
Talat Baran
In catalytic systems, the support materials need to be both eco friendly and low cost as well as having high thermal and chemical stability. In this paper, a novel starch supported palladium catalyst, which had these outstanding properties, was designed and its catalytic activity was evaluated in a Suzuki coupling reaction under microwave heating with solvent-free and mild reaction conditions. The starch supported catalyst gave remarkable reaction yields after only 5min as a result of the coupling reaction of the phenyl boronic acid with 23 different substrates, which are bearing aril bromide, iodide, and chloride...
February 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28242372/green-synthesis-of-gold-nanoparticles-using-brown-algae-cystoseira-baccata-its-activity-in-colon-cancer-cells
#4
N González-Ballesteros, S Prado-López, J B Rodríguez-González, M Lastra, M C Rodríguez-Argüelles
This study is the first dealt with the use of brown macroalgae Cystoseira baccata (CB) extracts in obtaining gold nanoparticles (Au@CB) through an eco-friendly, fast, one-pot synthetic route. The formation of spherical, stable, polycrystalline nanoparticles with mean diameter of 8.4±2.2nm was demonstrated by UV-vis spectroscopy, TEM, HRTEM, STEM and zeta potential measurements. The extract appears to act as a protective agent where the particles are embedded, keeping them separated, avoiding aggregation and coalescence...
February 20, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28188348/graphene-oxide-fe3o4-as-sorbent-for-magnetic-solid-phase-extraction-coupled-with-liquid-chromatography-to-determine-2-4-6-trinitrotoluene-in-water-samples
#5
Luciana Costa Dos Reis, Lorena Vidal, Antonio Canals
A fast, simple, economical, and environmentally friendly magnetic solid-phase extraction (MSPE) procedure has been developed to preconcentrate 2,4,6-trinitrotoluene (TNT) from water samples prior to determination by liquid chromatography-UV-Vis employing graphene oxide/Fe3O4 nanocomposite as sorbent. The nanocomposite synthesis was investigated, and the MSPE was optimized by a multivariate approach. The optimum MSPE conditions were 40 mg of nanocomposite, 10 min of vortex extraction, 1 mL of acetonitrile as eluent, and 6 min of desorption in an ultrasonic bath...
February 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28111663/deep-eutectic-solvents-similia-similibus-solvuntur
#6
Stefan Zahn
Deep eutectic solvents, mixtures of an organic compound and a salt with a deep eutectic melting point, are promising cheap and eco-friendly alternatives to ionic liquids. Ab initio molecular dynamics simulations of reline, a mixture consisting of urea and choline chloride, reveal that not solely hydrogen bonds allow similar interactions between both constituents. The chloride anion and the oxygen atom of urea also show a similar spatial distribution close to the cationic core of choline due to a similar charge located on both atoms...
February 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28107903/ion-mobility-spectrometry-as-a-fast-analytical-tool-in-benzalkonium-chloride-homologs-determination
#7
D Gallart-Mateu, S Armenta, F A Esteve-Turrillas, M de la Guardia
A novel procedure is proposed for the determination by ion mobility spectrometry (IMS) of C12, C14 and C16 benzalkonium chloride (BAC) homologs. The proposed method requires minimum sample treatment and the measurement was made in less than one minute. A high sensitivity was obtained for BAC determination by IMS with limit of detection values from 37 to 69µgL(-1). Accuracy of the proposed methodology was evaluated through the analysis of aqueous and alcoholic samples spiked with BAC at concentration levels from 0...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28076353/a-topological-criterion-for-filtering-information-in-complex-brain-networks
#8
Fabrizio De Vico Fallani, Vito Latora, Mario Chavez
In many biological systems, the network of interactions between the elements can only be inferred from experimental measurements. In neuroscience, non-invasive imaging tools are extensively used to derive either structural or functional brain networks in-vivo. As a result of the inference process, we obtain a matrix of values corresponding to a fully connected and weighted network. To turn this into a useful sparse network, thresholding is typically adopted to cancel a percentage of the weakest connections...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28057824/the-ecology-and-evolution-of-social-behavior-in-microbes
#9
REVIEW
Corina E Tarnita
Cooperation has been studied extensively across the tree of life, from eusociality in insects to social behavior in humans, but it is only recently that a social dimension has been recognized and extensively explored for microbes. Research into microbial cooperation has accelerated dramatically and microbes have become a favorite system because of their fast evolution, their convenience as lab study systems and the opportunity for molecular investigations. However, the study of microbes also poses significant challenges, such as a lack of knowledge and an inaccessibility of the ecological context (used here to include both the abiotic and the biotic environment) under which the trait deemed cooperative has evolved and is maintained...
January 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28000781/direct-synthesis-of-graphitic-mesoporous-carbon-from-green-phenolic-resins-exposed-to-subsequent-uv-and-ir-laser-irradiations
#10
Mihai Sopronyi, Felix Sima, Cyril Vaulot, Luc Delmotte, Armel Bahouka, Camelia Matei Ghimbeu
The design of mesoporous carbon materials with controlled textural and structural features by rapid, cost-effective and eco-friendly means is highly demanded for many fields of applications. We report herein on the fast and tailored synthesis of mesoporous carbon by UV and IR laser assisted irradiations of a solution consisting of green phenolic resins and surfactant agent. By tailoring the UV laser parameters such as energy, pulse repetition rate or exposure time carbon materials with different pore size, architecture and wall thickness were obtained...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27988899/microwave-assisted-enhancement-of-milkweed-calotropis-procera-l-leaves-as-an-eco-friendly-source-of-natural-colorants-for-textile
#11
Muhammad Hussaan, Naeem Iqbal, Shahid Adeel, Muhammad Azeem, M Tariq Javed, Ali Raza
Application of natural colorants to textile fabrics has gained worldwide public acceptance due to the hazardous nature of synthetic dyes. Present study investigated the microwave's mediated extraction of natural colorants from leaves of milkweed (Calotropis procera L.) as well as their application to cotton fabrics assisted with biochemical mordants. Dye extraction from C. procera leaves was carried out in various mediums (alkali and aqueous), and the extracted dye as well as cotton fabrics was irradiated with microwaves for 2, 4, 6, 8, or 10 min...
December 17, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27771100/centrifuge-less-dispersive-liquid-liquid-microextraction-base-on-the-solidification-of-switchable-solvent-for-rapid-on-site-extraction-of-four-pyrethroid-insecticides-in-water-samples
#12
Lu Hu, Huazi Wang, Heng Qian, Chaoran Liu, Runhua Lu, Sanbing Zhang, Wenfeng Zhou, Haixiang Gao, Donghui Xu
An on-site dispersive liquid liquid microextraction base on the solidification of switchable solvent has been developed as a simple, rapid and eco-friendly sample extraction method for the fast determination of pyrethroid insecticides in aqueous samples using high-performance liquid chromatography with ultraviolet detection. In this extraction method, medium-chain saturated fatty acids (n≥10), which can rapidly solidify at low temperatures (<20°C), were investigated as switchable hydrophilic solvents...
November 11, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27736874/eco-evolutionary-model-of-rapid-phenotypic-diversification-in-species-rich-communities
#13
Paula Villa Martín, Jorge Hidalgo, Rafael Rubio de Casas, Miguel A Muñoz
Evolutionary and ecosystem dynamics are often treated as different processes -operating at separate timescales- even if evidence reveals that rapid evolutionary changes can feed back into ecological interactions. A recent long-term field experiment has explicitly shown that communities of competing plant species can experience very fast phenotypic diversification, and that this gives rise to enhanced complementarity in resource exploitation and to enlarged ecosystem-level productivity. Here, we build on progress made in recent years in the integration of eco-evolutionary dynamics, and present a computational approach aimed at describing these empirical findings in detail...
October 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27701017/design-and-application-of-sporopollenin-microcapsule-supported-palladium-catalyst-remarkably-high-turnover-frequency-and-reusability-in-catalysis-of-biaryls
#14
Talat Baran, Idris Sargin, Murat Kaya, Ayfer Menteş, Talip Ceter
Bio-based catalyst support materials with high thermal and structural stability are desired for catalysts systems requiring harsh conditions. In this study, a thermally stable palladium catalyst (up to 440°C) was designed from sporopollenin, which occurs naturally in the outer exine layer of pollens and is widely acknowledged as chemically very stable and inert biological material. Catalyst design procedure included (1) extraction of sporopollenin microcapsules from Betula pendula pollens (∼25μm), (2) amino-functionalisation of the microcapsules, (3) Schiff base modification and (4) preparation of Pd(II) catalyst...
January 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27622703/low-intensity-ultrasonic-irradiation-for-highly-efficient-eco-friendly-and-fast-synthesis-of-graphene-oxide
#15
Tayyebeh Soltani, Byeong-Kyu Lee
High quality graphene oxide (GO) with low layer number (less than five layers) and large inter-layer space was produced via a new and efficient method using environmentally friendly, fast and economic ultrasonic radiation. The ultrasonic method neither generated any toxic gas nor required any NaNO3, which have been the main drawbacks of the Hummers methods. The major obstacles of the recently reported improved Hummers method for GO synthesis, such as high reaction temperature (50°C) and long reaction time (12h), were successfully solved using a low intensity-ultrasonic bath for 45min at 30°C, which significantly reduced the reaction time and energy consumption for GO synthesis...
August 20, 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27474586/flame-retardation-of-cellulose-rich-fabrics-via-a-simplified-layer-by-layer-assembly
#16
Jun-Chi Yang, Wang Liao, Shi-Bi Deng, Zhi-Jie Cao, Yu-Zhong Wang
Due to the high cellulose content of cotton (88.0-96.5%), the flame retardation of cotton fabrics can be achieved via an approach for the flame retardation of cellulose. In this work, a facile water-based flame retardant coating was deposited on cotton fabrics by a 'simplified' layer-by-layer (LbL) assembly. The novel coating solution was based on a mild reaction between ammonium polyphosphate (APP) and branched polyethyleneimine (BPEI), and the reaction mechanism was studied. TGA results showed that the char residues of coated fabrics were remarkably increased...
October 20, 2016: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27470942/fast-removal-of-copper-ions-from-aqueous-solution-using-an-eco-friendly-fibrous-adsorbent
#17
Yaolan Niu, Diwen Ying, Kan Li, Yalin Wang, Jinping Jia
Functional PET fiber (PET-AA-CS) was prepared by oxygen-plasma pretreatment and grafting of acrylic acid (AA) and low-molecular-weight chitosan (LMCS) on the polyethylene glycol terephthalate (PET) substrate. This adsorbent was targeted for quick removal of metal ion in river pollutions with an easy recycling of the fiber after emergency processing. The fabricated PET-AA-CS was characterized by the scanning electron microscope (SEM), contact angle, fourier transform infrared (FTIR) spectra and X-ray photoelectron spectroscopy (XPS) to look into its morphology, surface functional groups, and adsorption mechanism of copper ions from the aqueous solution...
October 2016: Chemosphere
https://www.readbyqxmd.com/read/27413887/green-dyeing-process-of-modified-cotton-fibres-using-natural-dyes-extracted-from-tamarix-aphylla-l-karst-leaves
#18
Noureddine Baaka, Adel Mahfoudhi, Wafa Haddar, Mohamed Farouk Mhenni, Zine Mighri
This research work involves an eco-friendly dyeing process of modified cotton with the aqueous extract of Tamarix aphylla leaves. During this process, the dyeing step was carried out on modified cotton by several cationising agents in order to improve its dyeability. The influence of the main dyeing conditions (dye bath pH, dyeing time, dyeing temperature, salt addition) on the performances of this dyeing process were studied. The dyeing performances of this process were appreciated by measuring the colour yield (K/S) and the fastness properties of the dyed samples...
January 2017: Natural Product Research
https://www.readbyqxmd.com/read/27233234/new-strategy-for-the-biosorption-of-atrazine-after-magnetic-solid-phase-extraction-from-water-followed-by-high-performance-liquid-chromatography-analysis
#19
Seyed Ammar Haeri, Shahryar Abbasi
We describe a rapid and simple microextraction of atrazine from water samples. This method is based on the use of magnetic nanoparticles as sorbents and bioaggregates that are applied to the extraction and preconcentration of atrazine. The resulting magnetic nanoparticles possess a fast adsorption kinetics and high adsorption capacity. Bioaggregates made up of rhaminolipid biosurfactant were assessed as a new strategy for the sample treatment. The extractant was obtained from magnetic nanoparticles using the magnetic solid-phase extraction method...
July 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27222752/an-eco-friendly-dyeing-of-woolen-yarn-by-terminalia-chebula-extract-with-evaluations-of-kinetic-and-adsorption-characteristics
#20
Mohd Shabbir, Luqman Jameel Rather, Shahid-Ul-Islam, Mohd Nadeem Bukhari, Mohd Shahid, Mohd Ali Khan, Faqeer Mohammad
In the present study Terminalia chebula was used as an eco-friendly natural colorant for sustainable textile coloration of woolen yarn with primary emphasis on thermodynamic and kinetic adsorption aspects of dyeing processes. Polyphenols and ellagitannins are the main coloring components of the dye extract. Assessment of the effect of pH on dye adsorption showed an increase in adsorption capacity with decreasing pH. Effect of temperature on dye adsorption showed 80 °C as optimum temperature for wool dyeing with T...
May 2016: Journal of Advanced Research
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