scholarly journals Amidoxime Functionalization of Algal/Polyethyleneimine Beads for the Sorption of Sr(II) from Aqueous Solutions

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3893 ◽  
Author(s):  
Yuezhou Wei ◽  
Khalid A. M. Salih ◽  
Siming Lu ◽  
Mohammed F. Hamza ◽  
Toyohisa Fujita ◽  
...  
Keyword(s):  
Renewable Resources ◽  
High Stability ◽  
Physicochemical Characteristics ◽  
Langmuir Equation ◽  
Softness Parameter ◽  
New Material ◽  
Complex Solutions ◽  
Seawater Samples ◽  
Ph Optimization ◽  
Cacl2 Solution

There is a need for developing new sorbents that incorporate renewable resources for the treatment of metal-containing solutions. Algal-polyethyleneimine beads (APEI) (reinforced with alginate) are functionalized by grafting amidoxime groups (AO-APEI). Physicochemical characteristics of the new material are characterized using FTIR, XPS, TGA, SEM, SEM-EDX, and BET. AO-APEI beads are tested for the recovery of Sr(II) from synthetic solutions after pH optimization (≈ pH 6). Uptake kinetics is fast (equilibrium ≈ 60–90 min). Sorption isotherm (fitted by the Langmuir equation) shows remarkable sorption capacity (≈ 189 mg Sr g−1). Sr(II) is desorbed using 0.2 M HCl/0.5 M CaCl2 solution; sorbent recycling over five cycles shows high stability in terms of sorption/desorption performances. The presence of competitor cations is studied in relation to the pH; the selectivity for Sr(II) is correlated to the softness parameter. Finally, the recovery of Sr(II) is carried out in complex solutions (seawater samples): AO-APEI is remarkably selective over highly concentrated metal cations such as Na(I), K(I), Mg(II), and Ca(II), with weaker selectivity over B(I) and As(V). AO-APEI appears to be a promising material for selective recovery of strontium from complex solutions (including seawater).

Neoteric Material Based on Renewable Resources for Metal-Contaminated Waters

2021 ◽  
Vol 9 (1) ◽  
pp. 3
Author(s):  
Iolanda-Veronica Ganea ◽  
Alexandrina Nan ◽  
Iulia Neamțiu ◽  
Călin Baciu
Keyword(s):  
Electron Microscopy ◽  
Renewable Resources ◽  
Absorption Spectrometry ◽  
Contaminated Water ◽  
Metal Release ◽  
Continuous Increase ◽  
X Ray ◽  
Environmental Media ◽  
New Material ◽  
Low Costs

A continuous increase of environmental pollution has been recorded worldwide, during recent decades, as a result of industrialization and urbanization. In particular, metal release in the environmental media may threaten human health, due to their persistence and accumulation in the food chain. We report here the functionalization of chitosan with poly(benzofurane-co-arylacetic) acid, which is a new material with the ability of complex metals from contaminated water. The synthesized polymer was structurally investigated by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photon electron microscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR), while heavy metals were determined by atomic absorption spectrometry. Different isotherms and kinetic models were used to describe the absorption equilibrium and the behavior of the material, based on the initial pollutant concentration and contact time. The results are pointing out that such natural materials can be easily synthesized, at low costs, thus offering attractive solutions for wastewater treatment.

scholarly journals Cellulose Nanocrystals/Graphene Hybrids—A Promising New Class of Materials for Advanced Applications

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1523 ◽  
Author(s):  
Djalal Trache ◽  
Vijay Kumar Thakur ◽  
Rabah Boukherroub
Keyword(s):  
Cellulose Nanocrystals ◽  
Renewable Resources ◽  
Food Packaging ◽  
Environmental Concern ◽  
Physicochemical Characteristics ◽  
Great Promise ◽  
New Class ◽  
Wide Range ◽  
Key Features ◽  
Basic Concepts

With the growth of global fossil-based resource consumption and the environmental concern, there is an urgent need to develop sustainable and environmentally friendly materials, which exhibit promising properties and could maintain an acceptable level of performance to substitute the petroleum-based ones. As elite nanomaterials, cellulose nanocrystals (CNC) derived from natural renewable resources, exhibit excellent physicochemical properties, biodegradability and biocompatibility and have attracted tremendous interest nowadays. Their combination with other nanomaterials such as graphene-based materials (GNM) has been revealed to be useful and generated new hybrid materials with fascinating physicochemical characteristics and performances. In this context, the review presented herein describes the quickly growing field of a new emerging generation of CNC/GNM hybrids, with a focus on strategies for their preparation and most relevant achievements. These hybrids showed great promise in a wide range of applications such as separation, energy storage, electronic, optic, biomedical, catalysis and food packaging. Some basic concepts and general background on the preparation of CNC and GNM as well as their key features are provided ahead.

scholarly journals Long-term stability and scale-up of noncovalently bound gold nanoparticle-siRNA suspensions

2019 ◽  
Vol 10 ◽  
pp. 2568-2578
Author(s):  
Anna V Epanchintseva ◽  
Julia E Poletaeva ◽  
Dmitrii V Pyshnyi ◽  
Elena I Ryabchikova ◽  
Inna A Pyshnaya
Keyword(s):  
Surface Density ◽  
High Stability ◽  
Scale Up ◽  
Scaling Up ◽  
Physicochemical Characteristics ◽  
Sirna Duplex ◽  
Long Term Storage ◽  
Vis Spectroscopy ◽  
Term Storage

Gold nanoparticles (AuNPs) are a platform for the creation of nanoconstructions that can have a variety of functions, including the delivery of therapeutic nucleic acids. We previously designed a AuNP/small interfering RNA (siRNA) nanoconstruction consisting of siRNA noncovalently bound on the AuNP surface and showed that this construction, when coated with a lipid shell, was an efficient vehicle for the delivery of siRNA into cells. The goal of the present work was to study the possibility of scaling up the synthesis of AuNP-siRNA and its long-term storage without loss of physicochemical characteristics and siRNA duplex integrity as well as siRNA surface density. Dynamic light scattering, transmission electron microscopy, UV–vis spectroscopy, and electrophoresis were used to study the effect of scaling up the AuNP-siRNA synthesis and long term storage of its suspension on physicochemical properties of the samples and integrity of the siRNA duplex. It was shown that a ten-fold increase in the volume of the reaction mixture decreased the surface density of siRNA by about 10%, which influenced the corresponding physicochemical characteristics of the AuNP-siRNA suspension. The storage of the AuNP-siRNA suspension at 4 °C for different times resulted in the formation of particle clusters of high colloidal stability as demonstrated by conventional methods. These clusters completely disintegrated when albumin was added, indicating that they are agglomerates (and not aggregates) of AuNP-siRNA. The AuNPs-siRNA nanoconstruction demonstrated integrity of the siRNA duplex and high stability of the siRNA surface density during storage for seven months at 4 °C. Thus, it can be concluded that it is possible to scale-up the synthesis of noncovalent AuNP-siRNA and to obtain a nanoconstruction possessing high stability in terms of physicochemical characteristics and siRNA surface density for a long period.

Are All Gadolinium-based Contrast Agents Similar? The Importance of High Stability, High Relaxivity and High Concentration

2009 ◽  
Vol 4 (2) ◽  
pp. 98 ◽  
Author(s):  
Nicoletta Anzalone ◽  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agents ◽  
High Stability ◽  
Physicochemical Characteristics ◽  
Resonance Imaging ◽  
Contributing Factors ◽  
High Concentration ◽  
High Relaxivity ◽  
The Stability

Gadolinium-based contrast agents (GBCAs) are commonly used to enhance image acquisition via magnetic resonance imaging, but they differ in their physicochemical characteristics and therefore their function. The stability, concentration and relaxivity of a GBCA can have a major impact on clinical efficacy. Stability is related to safety. GBCAs can be categorised into three stability classes: non-ionic linear agents, ionic linear agents and macrocyclic agents, in order of increasing stability. Relaxivity and concentration are contributing factors to the level of enhancement that can be achieved with any given GBCA. Gadobutrol, gadobenate and gadoxetic acid have relatively high relaxivities. Among these compounds, only gadobutrol is commercially available at a higher concentration of 1.0M, whereas the others are used at a standard concentration of 0.5M. With high stability, relaxivity and concentration, gadobutrol has been shown in a number of clinical studies to be safe while improving image enhancement with increased conspicuity and sensitivity over other commonly used GBCAs.

scholarly journals Physicochemical characteristics of 2-, 3- and 4-methylpyridinium tetrachloroferrates(III)

2011 ◽  
Vol 9 (6) ◽  
pp. 1096-1101 ◽  
Author(s):  
Dariusz Wyrzykowski ◽  
Michał Wera ◽  
Artur Sikorski ◽  
Dagmara Jacewicz ◽  
Lech Chmurzyński
Keyword(s):  
Crystal Structure ◽  
Thermal Properties ◽  
High Stability ◽  
Physicochemical Characteristics ◽  
Tetrahedral Coordination ◽  
Iron Cation ◽  
Distorted Tetrahedral Coordination

AbstractThe crystal structure of 2-methylpyridinium tetrachloroferrate(III) was determined. The iron cation is tetracoordinated by chloride anions, and it adopts a slightly distorted tetrahedral coordination with three angles smaller, two almost equal and one larger than the tetrahedral. The compound is isostructural with its 3-, and 4-methylpyridinium analogues. The thermal properties of 2-, 3- and 4-methylpyridinium tetrachloroferrates(III) have been studied using TG and DSC techniques. The compounds exhibit a high stability in the melt.

A New Material Based on Renewable Resources: Chitin and Betaine

2011 ◽  
Vol 347-353 ◽  
pp. 2215-2218
Author(s):  
Min Zhang ◽  
Xiao Cai Yu ◽  
Min Jing Li ◽  
Wei Chen
Keyword(s):  
Renewable Resources ◽  
Environmentally Friendly ◽  
Dry Process ◽  
New Material ◽  
Betaine Hydrochloride

Water-insoluble chitin betainate was environmentally friendly prepared by esterifying chitin with betaine hydrochloride in the presence of dicyandiamide by dry process. The process achieved free-pollution and easy treatment. The chitin betainate holds potential as an adsorbent by the results of the adsorption experiments.

scholarly journals The Burial Under Peat Technique: An Innovative Method to Restore Sphagnum Peatlands Impacted by Mineral Linear Disturbances

2021 ◽  
Vol 9 ◽  
Author(s):  
Kathy Pouliot ◽  
Line Rochefort ◽  
Marie-Claire LeBlanc ◽  
Mélina Guêné-Nanchen ◽  
Alexandre Beauchemin
Keyword(s):  
Chemical Elements ◽  
Cost Effective ◽  
Organic Soil ◽  
Physicochemical Characteristics ◽  
Point Of View ◽  
Drainage Ditches ◽  
The Road ◽  
Mineral Material ◽  
Cost Effective Method ◽  
New Material

Mineral roads in peatlands change the nature of the substrate, influence the water table level of the peatland on either side of the road and the physicochemical characteristics of the water and peat. These changes can in turn affect plant community composition. The efficiency of an innovative and affordable method for the restoration of peatlands impacted by roads was evaluated: the Burial Under Peat Technique. To be considered effective from an ecological point of view, the technique should meet restoration goals by 1) confining the chemical elements and compounds potentially leaching from the mineral material; 2) creating and maintaining a restored surface elevation similar to the adjacent peatland for optimal rewetting; and 3) re-establishing typical peatland vegetation communities. Three years post-restoration, water sampled at various depths and distances to the buried road presented chemical elements and compounds concentrations similar to the means measured in the pristine surrounding peatland for most of the ions analyzed. The different steps of the technique ensured the reestablishment of an elevation similar to the surrounding peatland. The return of peatland plant communities was slow, mainly due to local factors (e.g., presence of drainage ditches). Furthermore, the Burial Under Peat Technique fulfilled the restoration objectives in re-establishing an acid organic soil. Finally, it is a cost-effective method in comparison to completely removing the mineral material and transporting new material to fill the depression left by the excavation of the road.

Surface Analyses of Arboform Samples

2016 ◽  
Vol 699 ◽  
pp. 80-85 ◽  
Author(s):  
Simona Plavanescu Mazurchevici ◽  
Dumitru Nedelcu ◽  
Denise Bellisario ◽  
Constantin Carausu
Keyword(s):  
Renewable Resources ◽  
Plastic Material ◽  
Injection Pressure ◽  
Biodegradable Materials ◽  
Melt Temperature ◽  
Injection Angle ◽  
Oil Reserves ◽  
New Material ◽  
East West ◽  
Petroleum Oil

Due to the global warming and diminishing petroleum oil reserves the conversion of biomass in useful biodegradable materials represent a tremendous need in terms of economic and environmental problem. During the last years, enormous effort have been sustained by the researchers who tried to develop and improve green (recyclable, biocompatible, and biodegradable) materials from renewable resources strengthening this way the global sustainability. Following this need a new material Arboform – „liquid wood“, that meets all the above conditions was developed by a team of german researchers appearing shortly on the market. This material can be processed like any other plastic material, so no need changing in terms of technological equipment. Since the injection molding is the most widely used process in manufacturing polymer products, unavoidable surface quality problems appear. In order to obtain a clear image of surface sample are analyzed the inherent properties of the used material, injection parameters and conditions using a Talysurf CLI 2000 profilometer. The equipment is able to perform high-accuracy measurements of the surface topography for Arboform L, V3 Nature (A-LW) and Arboform L, V3 Nature Reinforced with Aramid Fibers (A-LWAF) samples. The experimental research was achieved by means of the Taguchi experiment plan, with 6 input parameters (injection pressure, melt temperature, cooling time, screw displacement injection time and injection angle) each of them having two levels of variation. In case of 90 degrees angle injection (samples from 1 and 2 experiments) the dispersion roughness (Ra) measured on east-west direction is lower (26.6% for A-LW and 23.7% respectively for A-LWAF) compared with the roughness measurement on north-south direction. At 0 degrees angle injection the dispersion had the same trend (lower for east-west direction) of the A-LWAF 4 and 6 samples and higher in the east-west direction for 3 and 5 samples of A-LW material studied.

scholarly journals The circular design for a school in conditioned Quercus cerris hardwood glulam

2021 ◽  
Vol 6 (1) ◽  
pp. 72
Author(s):  
Francesco Paolo R. Marino ◽  
Filiberto Lembo ◽  
Caterina Di Lucchio
Keyword(s):  
Renewable Resources ◽  
Circular Economy ◽  
Global Perspective ◽  
Protection Factor ◽  
Design For Sustainability ◽  
New Material ◽  
Quercus Cerris ◽  
Circular Design ◽  
New Buildings ◽  
Made In

<p class="Abstracttext-VITRUVIOCxSpFirst">The <em>Design for Sustainability</em> of building processes and products is closely connected to <em>Design for Adaptability</em>, to <em>Design for Disassembling</em> and <em>Design for Recycling</em>, in a global perspective of <em>Circular Economy</em> that has at his centre the enhancement of renewable resources in specific environmental contexts, economic, social and cultural. This contribution is part of a research aimed at validating experiences already made in the direction of pre-competitive development, also with the purpose of patenting process and products, with a <em>Cerro Lucano supply chain</em> that could constitute an important environmental protection factor, for social equity and economic development. In a series of previous researches, the application of this new material was hypothesized both in the field of conservation and refurbishment of building heritage, and for new ways of designing new buildings, even of considerable height. In this contribution it refers to its application to the design of a new nZEB school complex in Rionero in Vulture (Potenza), according to the principles of circular design.</p>

Characterization of a monolayer graphitic structure

1994 ◽  
Vol 52 ◽  
pp. 760-761
Author(s):  
X. Lin ◽  
X. K. Wang ◽  
V. P. Dravid ◽  
J. B. Ketterson ◽  
R. P. H. Chang
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Synthesis Process ◽  
Graphitic Structure ◽  
Positive Gaussian Curvature ◽  
Graphitic Sheet ◽  
Structural And Electronic Properties ◽  
New Material ◽  
Hexagonal Network

For small curvatures of a graphitic sheet, carbon atoms can maintain their preferred sp2 bonding while allowing the sheet to have various three-dimensional geometries, which may have exotic structural and electronic properties. In addition the fivefold rings will lead to a positive Gaussian curvature in the hexagonal network, and the sevenfold rings cause a negative one. By combining these sevenfold and fivefold rings with sixfold rings, it is possible to construct complicated carbon sp2 networks. Because it is much easier to introduce pentagons and heptagons into the single-layer hexagonal network than into the multilayer network, the complicated morphologies would be more common in the single-layer graphite structures. In this contribution, we report the observation and characterization of a new material of monolayer graphitic structure by electron diffraction, HREM, EELS.The synthesis process used in this study is reported early. We utilized a composite anode of graphite and copper for arc evaporation in helium.

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