Metal-ion-imprinted thermo-responsive materials obtained from bacterial cellulose: synthesis, characterization, and adsorption evaluation

2019 ◽  
Vol 7 (19) ◽  
pp. 11742-11755 ◽  
Author(s):  
Zhiming Li ◽  
Hua Tian ◽  
Yanyan Yuan ◽  
Xueqiong Yin ◽  
Xin Wei ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Metal Ion ◽  
Analytical Techniques ◽  
Cellulose Synthesis ◽  
Structure And Properties ◽  
Responsive Materials ◽  
Ion Imprinted

A novel gradient heating procedure was developed to fabricate a targeted metal-ion-imprinted thermo-responsive material from bacterial cellulose using Cu2+ as a template and N-isopropylacrylamide (NIPAM) as a monomer; moreover, its structure and properties were analysed via various analytical techniques.

scholarly journals Effect of Gluconacetobacter xylinus cultivation conditions on the selected properties of bacterial cellulose

2016 ◽  
Vol 18 (4) ◽  
pp. 117-123 ◽  
Author(s):  
Karol Fijałkowski ◽  
Anna Żywicka ◽  
Radosław Drozd ◽  
Marian Kordas ◽  
Rafał Rakoczy
Keyword(s):  
Bacterial Cellulose ◽  
Bacterial Strain ◽  
Point Of View ◽  
Synthesis Process ◽  
Cellulose Synthesis ◽  
Gluconacetobacter Xylinus ◽  
Water Release ◽  
Good Efficiency ◽  
Cellulose Fibrils ◽  
Culturing Conditions

Abstract The aim of the study was to analyze the changes in the parameters of bacterial cultures and bacterial cellulose (BC) synthesized by four reference strains of Gluconacetobacter xylinus during 31-day cultivation in stationary conditions. The study showed that the most visible changes in the analyzed parameters of BC, regardless of the bacterial strain used for their synthesis, were observed in the first 10–14 days of the experiment. It was also revealed, that among parameters showing dependence associated with the particular bacterial strain were the rate and period of BC synthesis, the growth rate of bacteria anchored to the cellulose fibrils, the capacity to absorb water and the water release rate. The results presented in this work may be useful in the selection of optimum culturing conditions and period from the point of view of good efficiency of the cellulose synthesis process.

scholarly journals Molecularly Imprinted Polymers for Removal of Metal Ions: An Alternative Treatment Method

Biomimetics ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 38 ◽  
Author(s):  
Özgecan Erdem ◽  
Yeşeren Saylan ◽  
Müge Andaç ◽  
Adil Denizli
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Membrane Filtration ◽  
Polymeric Materials ◽  
Treatment Method ◽  
Terrestrial Environment ◽  
Molecularly Imprinted ◽  
Metal Ion Removal ◽  
Ion Imprinted ◽  
Removal Of Metal Ions

Aquatic and terrestrial environment and human health have been seriously threatened with the release of metal-containing wastewater by the rapid growth in the industry. There are various methods which have been used for removal of ions from the environment, such as membrane filtration, ion exchange, membrane assisted liquid extraction and adsorption. As a sort of special innovation, a polymerization technique, namely molecular imprinting is carried out by specific identification for the target by mixing it with a functional monomer. After the polymerization occurred, the target ion can be removed with suitable methods. At the end of this process, specific cavities, namely binding sites, are able to recognize target ions selectively. However, the selectivity of the molecularly imprinted polymer is variable not only because of the type of ligand but also charge, size coordination number, and geometry of the target ion. In this review, metal ion-imprinted polymeric materials that can be applied for metal ion removal from different sources are discussed and exemplified briefly with different metal ions.

scholarly journals Recent Advances in Stimuli-Responsive Photofunctional Materials Based on Accommodation of Chromophore into Layered Double Hydroxide Nanogallery

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Wu Li ◽  
Dongpeng Yan ◽  
Rui Gao ◽  
Jun Lu ◽  
Min Wei ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metal Ion ◽  
Recent Progress ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Chemical Factors ◽  
Host Matrices ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Further Development

The assembly of photofunctional molecules into host matrices has become an important strategy to achieve tunable fluorescence and to develop intelligent materials. The stimuli-responsive photofunctional materials based on chromophores-assembled layered double hydroxides (LDHs) have received much attention from both academic and industry fields as a result of their advantages, such as high photo/thermal stability, easy processing, and well reversibility, which can construct new types of smart luminescent nanomaterials (e.g., ultrathin film and nanocomposite) for sensor and switch applications. In this paper, external environmental stimuli have mainly involved physical (such as temperature, pressure, light, and electricity) and chemical factors (such as pH and metal ion); recent progress on the LDH-based organic-inorganic stimuli-responsive materials has been summarized. Moreover, perspectives on further development of these materials are also discussed.

scholarly journals Magnetically responsive materials for solid phase extraction

2019 ◽  
Vol 6 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Ivo Safarik ◽  
Jitka Prochazkova ◽  
Eva Baldikova ◽  
Kristyna Pospiskova
Keyword(s):  
Solid Phase Extraction ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Analytical Techniques ◽  
Magnetic Solid Phase Extraction ◽  
Short Review ◽  
Biologically Active ◽  
Phase Extraction ◽  
Responsive Materials ◽  
Magnetic Solid

Magnetically responsive materials have found many important applications in analytical chemistry. In this short review the basic information about Magnetic solid phase extraction and Magnetic textile solid phase extraction is given. These analytical techniques enable to preconcentrate target biologically active compounds or pollutants from water samples. Both procedures enable to lower the limit of detection using conventional analytical procedures.

scholarly journals SYNTHESIS, MOLLUSCICIDALAND ANTIMICROBIAL POTENTIALITIES OF IRON TRIAD MONONUCLEAR METAL COMPLEXES INCORPORATING TRIDENTATE ASYMMETRICAL SCHIFF BASE LIGANDS CONTAINING SOFT SULFUR COORDINATING ATOM

2019 ◽  
pp. 103-113
Author(s):  
AMAL M ALOSAIMI ◽  
INES EL MANNOUBI ◽  
SAMI A ZABIN
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Metal Ion ◽  
Lethal Dose ◽  
Analytical Techniques ◽  
Central Metal ◽  
Schiff Base Ligands ◽  
Molluscicidal Activity

Objective: This work aimed at synthesizing tridentates asymmetrical Schiff base ligands containing sulfur atom and using them for preparing metal complexes with the iron triad metals. The prepared compounds were assayed in vitro for antimicrobial potential and in vivo molluscicidal activity. Methods: The unsymmetrical tridentate Schiff bases (SL1, SL2, and SL3) were prepared using 2-aminothiophenol as primary amine and condensed with 2-carboxybenzaldehyde, 2-hydroxy-1-naphthaldehyde, and 7-formyl-8-hydroxyquinoline. These ligands were used in preparing metal complexes with iron triad metals. The synthesized Schiff base ligands and their corresponding metal complexes were characterized and their proposed structures were confirmed using different physical and spectroscopic analytical techniques. All ligands and their corresponding metal complexes were assayed against different bacterial and fungal strains using the agar disk-diffusion technique. The molluscicidal activity was performed according to the standard reported methods as cited in the literature and by observing the toxicity and lethal dose according to the WHO guidelines. Results: The synthesized ligands behave as tridentate (NOS) ligands and form mononuclear complexes with the general formula [M(SL)2] with an octahedral geometry around the central metal ion. Metal complexes were non-electrolytic in nature. The in vitro antibacterial and antifungal examination results showed weak activity of the ligands, and there was enhanced activity with the complexes. The in vivo molluscicidal activity of the tested compounds showed good activity. Conclusion: The targeted compounds were prepared successfully, characterized, and showed some biological activity but lower than the standard reference drugs.

SEM and TEM for structure and properties characterization of bacterial cellulose/hydroxyapatite composites

Scanning ◽  
2016 ◽  
Vol 38 (6) ◽  
pp. 757-765 ◽  
Author(s):  
Natalia A. Arkharova ◽  
Elena I. Suvorova ◽  
Alexander V. Severin ◽  
Albert K. Khripunov ◽  
Sergey V. Krasheninnikov ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Structure And Properties ◽  
Sem And Tem ◽  
Properties Characterization

Research Progress on Wastewater Treatment by Heavy Metal Ion Imprinted Polymer

2018 ◽  
Vol 921 ◽  
pp. 35-39 ◽  
Author(s):  
Qin Tao Yang ◽  
Qing Lin Xie ◽  
Nan Chun Chen ◽  
Yi Jian Zhong
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ion ◽  
Heavy Metal Ion ◽  
Research Progress ◽  
Ion Imprinted ◽  
Ion Imprinted Polymers ◽  
Development Direction ◽  
Research Problems ◽  
Ion Imprinting

Owing to the efficient predetermination, specific recognition and wide applicability, metal ion imprinting technology, apply to the wastewater treatment. The principles, synthesis strategies of ion imprinting and typical heavy metal ion imprinted polymers (IIPs) are introduced in the review. Finally, it is pointed out that the futures research problems to be solved and the development direction of metal ion imprinting technology.

scholarly journals Uranium Speciation and Bioavailability in Aquatic Systems: An Overview

2002 ◽  
Vol 2 ◽  
pp. 707-729 ◽  
Author(s):  
Scott J. Markich
Keyword(s):  
Surface Waters ◽  
Metal Ion ◽  
Natural Waters ◽  
Analytical Techniques ◽  
Time Resolved ◽  
Analytical Technique ◽  
Major Form ◽  
Uranyl Carbonate ◽  
Inorganic Ligands ◽  
The Relationship

The speciation of uranium (U) in relation to its bioavailability is reviewed for surface waters (fresh- and seawater) and their sediments. A summary of available analytical and modeling techniques for determining U speciation is also presented. U(VI) is the major form of U in oxic surface waters, while U(IV) is the major form in anoxic waters. The bioavailability of U (i.e., its ability to bind to or traverse the cell surface of an organism) is dependent on its speciation, or physicochemical form. U occurs in surface waters in a variety of physicochemical forms, including the free metal ion (U4+or UO22+) and complexes with inorganic ligands (e.g., uranyl carbonate or uranyl phosphate), and humic substances (HS) (e.g., uranyl fulvate) in dissolved, colloidal, and/or particulate forms. Although the relationship between U speciation and bioavailability is complex, there is reasonable evidence to indicate that UO22+and UO2OH+are the major forms of U(VI) available to organisms, rather than U in strong complexes (e.g., uranyl fulvate) or adsorbed to colloidal and/or particulate matter. U(VI) complexes with inorganic ligands (e.g., carbonate or phosphate) and HS apparently reduce the bioavailability of U by reducing the activity of UO22+and UO2OH+. The majority of studies have used the results from thermodynamic speciation modeling to support these conclusions. Time-resolved laser-induced fluorescence spectroscopy is the only analytical technique able to directly determine specific U species, but is limited in use to freshwaters of low pH and ionic strength. Nearly all of the available information relating the speciation of U to its bioavailability has been derived using simple, chemically defined experimental freshwaters, rather than natural waters. No data are available for estuarine or seawater. Furthermore, there are no available data on the relationship between U speciation and bioavailability in sediments. An understanding of this relationship has been hindered due to the lack of direct quantitative U speciation techniques for particulate phases. More robust analytical techniques for determining the speciation of U in natural surface waters are needed before the relationship between U speciation and bioavailability can be clarified.

Preparation of Novel Ag/Bacterial Cellulose Hybrid Nanofibers for Antimicrobial Wound Dressing

2010 ◽  
Vol 152-153 ◽  
pp. 1771-1774 ◽  
Author(s):  
Jia Zhi Yang ◽  
Ju Wei Yu ◽  
Dong Ping Sun ◽  
Xu Jie Yang
Keyword(s):  
Bacterial Cellulose ◽  
Ag Nanoparticles ◽  
Antimicrobial Agents ◽  
Chemical Reduction ◽  
Cellulose Nanofibers ◽  
Analytical Techniques ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Hybrid Nanofibers ◽  
Transmission Electron

In this work, we describe a novel facile method to prepare long one-dimensional hybrid nanofibers by using hydrated bacterial cellulose nanofibers (BCF) as template. Silver (Ag) nanoparticles with an average diameter of 1.5 nm were well dispersed on BC nanofibers via a simple in situ chemical-reduction between AgNO3 and NaBH4 at relatively low temperature. The bare BCF and as-prepared Ag/BCF hybrid nanofibers were characterized by a range of analytical techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV–vis absorption spectra (UV–vis). The results reveal that Ag nanoparticles were homogeneously precipitated on the BCF surface. The results indicate that Ag/BCF hybrid nanofibers are promising candidate materials for functional antimicrobial agents.

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