SORPTION OF RED FOOD COLORING POLYMERS WITH MOLECULAR IMPRINTS

Polymers with molecular imprints are used as modifiers of the surface of piezoelectric sensors, so it is necessary to study their sorption properties. Isotherms of sorption of synthetic dyes with polymers with molecular imprint and their comparison polymers are obtained. The type of sorption isotherm is characteristic for polymeric materials with micro- and mesopores. The maximum sorption capacity of polymers in relation to dyes is determined, the areas of the projection of the dye molecules on the surface of the sorbent are estimated. With the sorption of multiply charged anionic dye particles, the surface of the sorbent acquires a partial negative charge, which makes it difficult to sorbate as the surface concentration of the sorbate increases. The efficiency of sorption of azo dyes by polymers with molecular imprint from aqueous solutions depends on the amount of ionized sulfo groups in the azo dye molecule, their location in the benzene ring, the symmetry of the dye molecule. Sorption of azo dye by polymers with molecular prints is mainly due to the formation of hydrogen bonds between the sulphonic group of the dye and the hydroxyl group of the sorbent. The area of the projections of molecules on the surface of the modified polymer for all the dyes does not exceed the calculated values of the areas of the molecules, which indicates a loose filling of the sorbent surface and it is probable that the orientation of the dye molecules in the adsorption layer is close to perpendicular to the surface of the sorbent. The values of extraction rates and distribution coefficients are determined, the imprinting factor is calculated. The highest imprinting factor was obtained for the azo dye Ponso 4R. It has been established that polymers with molecular imprinting based on polyimide have better sorption ability with respect to target molecules than their comparison polymers.Forcitation:Zyablov A.N., Khalzova S.A., Selemenev V.F. Sorption of red food coloring polymers with molecular imprints. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 42-47.

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SORPTION OF CARBOXYLIC ACIDS BY MOLECULARLY IMPRINTED POLYMERS

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/ivkkt.20206302.6071 ◽

2020 ◽

Vol 63 (2) ◽

pp. 71-76 ◽

Cited By ~ 1

Author(s):

Cao Nhat Linh ◽

Alexander N. Zyablov ◽

Olga V. Duvanova ◽

Vladimir F. Selemenev

Keyword(s):

Acetic Acid ◽

Carboxylic Acids ◽

Molecularly Imprinted Polymers ◽

Polymeric Materials ◽

Distribution Coefficients ◽

Sorption Data ◽

Static Mode ◽

Molecularly Imprinted ◽

Imprinted Polymers ◽

Sorption Ability

Molecularly imprinted polymers were synthesized as selective coatings of piezoelectric sensors for determination of carboxylic acids in the intermediate fractions of rectified ethanol. Molecularly imprinted polymers were obtained by reorganizing and imidizing polyamic acid chains in N,N-dimethylformamide in the presence of a template by the non-covalent imprinting method. The ability of molecularly imprinted polymers to recognize the target templates was evaluated by studying their sorption properties in comparison with non-imprinted polymers using direct conductometry in static mode. The equilibrium time of polyimide and molecularly imprinted polymers for acetic, propionic, butyric acids is in the range of 40 - 80 min. The type of sorption isotherm of acetic acid is characteristic of polymeric materials with micropores. During the sorption of acetic acid at low concentrations, the solvent-ethanol strongly competes with the adsorbed substance due to the close molecular sizes and the presence of group -OH. The type of sorption isotherms of propionic and butyric acids refers to the monomolecular adsorption. The sorption of carboxylic acids by molecularly imprinted polyimide is carried out mainly due to the formation of hydrogen bonds between carboxyl groups of adsorbent and adsorbate. According to the sorption data, the degrees of extraction, distribution coefficients, and imprinting factor values were calculated (IF = 3.0-15.1). It is shown that the molecularly imprinted polymers for carboxylic acids have better sorption ability to acid molecules than their non-imprinted polymers. At the same time, the molecularly imprinted polymer for butyric acid has the highest sorption capacity. Thus, the possibility of using molecularly imprinted polymers for carboxylic acids based on polyimide as selective coatings of piezosensors has been established.

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Degradation of an Azo Dye by Fenton Type Processes Assisted with UV Irradiation

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1462 ◽

2007 ◽

Vol 5 (1) ◽

Cited By ~ 3

Author(s):

Natalija Koprivanac ◽

Dinko Vujevic

Keyword(s):

Uv Irradiation ◽

Azo Dye ◽

Dye Degradation ◽

Degradation Products ◽

Batch Reactor ◽

Process Efficiency ◽

Molar Ratio ◽

Synthetic Dyes ◽

Ambient Conditions ◽

Treatment Methods

Organic synthetic dyes are widely produced and used today. Significant losses of organic and inorganic content occurs during the manufacturing and application of dyes and its discharge in the effluent presents a threat to the eco-systems due to general toxicity and resistance to destruction by biological treatment methods. Particularly azo dyes are of special environmental concern due to their degradation products such as aromatic amines, which are considered highly carcinogenic. So, dyes have to be removed from coloured wastewater before discharge. However, traditional treatment methods (adsorption, coagulation/flocculation) mainly transfer the contaminants from wastewater to secondary waste. Therefore, advanced oxidation processes seem to be sustainable and clean technology to decolorize and minimize organic dyes content from wastewater. In this paper, degradation of an azo dye C.I. Direct Orange 39 (DO39) using Fenton type processes (Fe2+/H2O2, Fe3+/H2O2and Fe0/H2O2) has been performed. The molar ratio of Fentons type reagents has been varied in the range of 1 : 5 up to 1 : 50 at 0.5 and 1.0 mM concentrations of iron salts and iron powder. Experiments have been conducted for two hours in a batch reactor with magnetic stirring, ambient conditions and pH 3. The process efficiency and formation of degradation by-products have been determined on the basis of results obtained by UV/VIS spectrophotometric, total organic carbon (TOC) and high performance liquid chromatography (HPLC) analyses. The optimal Fenton and Fenton ``like" processes parameters have been applied in the photo reactor, too. It has been observed that simultaneous utilization of UV irradiation with Fenton's and Fenton ``like" reagents increases the degradation of DO39 dye. Degradation of the dye in dilute aqueous solution follows pseudo-first order kinetics. The maximal decolourization of 20 mg L-1 DO39 in water of 93.2% and TOC degradation of 76.9% were obtained using Fe3+/H2O2= 1 : 5 molar ratio. The results indicate that the treatment of DO39 dye wastewater with UV/Fe3 +/H2O2 system was found to be the most efficient.

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The synthesis of novel BODIPY compounds for DSSC applications.

10.32920/ryerson.14656569 ◽

2021 ◽

Author(s):

Devin Douglas Machin

Keyword(s):

Fine Tuning ◽

Great Promise ◽

Device Performance ◽

Dye Molecules ◽

Dye Sensitized ◽

Redox Active ◽

Boron Dipyrromethene ◽

Photovoltaic Technologies ◽

Active Donor ◽

Dye Molecule

The dye-sensitized solar cell (DSSC) represents one of the most promising next-generation photovoltaic technologies. In addition, the DSSC manifold provides an exceptional platform to further appreciate photoinduced electron transfer and the fundamental features required for light-harvesting. The dye molecule is a key component in the DSSC and has achieved minor success utilizing both an organic and inorganic photosensitizers. DSSC’s show great promise owing to their inexpensive synthesis tunable optical and electrochemical properties, and a plethora of design possibilities. The typical anatomy of organic and inorganic DSSC dyes are comprised of a redox-active donor/chromophore (D) that is connected, through a conjugated linker (π), to an acceptor (A) capable of anchoring to titania (TiO2). Fine tuning each of these components can shift the absorption spectrum increasing the overall device efficiency. Boron-dipyrromethene (BODIPY) is an attractive moiety to integrate into DSSC dyes. BODIPY’s rigid organic framework should be able to improve dye stability while the high extinction coefficients of BODIPY based molecules have the potential to increase device performance. Herein, we explore the synthesis and physicochemical properties of BODIPY in an attempt to synthesize efficient DSSC dye molecules and efficient photovoltaic technologies.

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Development of novel pH-sensitive azo dyes from Cardanol as a bioresource

Pigment & Resin Technology ◽

10.1108/prt-03-2020-0026 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Siddhesh Umesh Mestry ◽

Umesh Ratan Mahajan ◽

Aswathy M. ◽

Shashank T. Mhaske

Keyword(s):

Azo Dyes ◽

Azo Dye ◽

Density Functional ◽

Ph Sensitivity ◽

Water Soluble ◽

Hydroxyl Group ◽

Disulfonic Acid ◽

Colour Properties ◽

Content Type ◽

Good Thermal Stability

Purpose The purpose of this paper is to use the bio-based resource as the starting material for the synthesis of azo dye. Cardanol is one of the most used bio-based resources for carrying out the synthesis of various compounds having numerous end applications. The study presents an attempt to develop an azo dye from Cardanol having end applications in pH-responsive dyes. Design/methodology/approach The cardanol was sulfonated to block the para position by which ortho positioned hydroxyl group after diazotization and coupling will provide necessary pH-sensitivity. The diazotization of two naphthalene derivatives, i.e. 1-naphthol-8-amino-3,6-disulfonic acid (H-acid) and 7-amino-4-hydroxy-2-naphthalene sulfonic acid (J-acid) was carried out using the standard practice, and the diazotized compounds were coupled with the sulfonated cardanol. The obtained dyes were characterized by Fourier transform infrared, nuclear magnetic resonance, carbon-hydrogen-nitrogen-sulfur analysis and hydroxyl value. The colour properties were checked using UV-vis spectrophotometry and density functional theory, while thermogravimetric analysis was used for the thermal degradation studies of both the dyes. Findings Water-soluble cardanol-based azo dyes were prepared successfully having good thermal stability, and the obtained results are being presented in this paper. Originality/value The originality lies between the use of cardanol as a bio-based resource for the synthesis of azo-dye and the obtained azo-dye has the pH-sensitivity.

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A study on structural, optical, thermal and electrical properties of the amaranth dye-doped KHOOD single crystal

International Journal of Modern Physics B ◽

10.1142/s0217979220500022 ◽

2019 ◽

Vol 34 (04) ◽

pp. 2050002 ◽

Cited By ~ 1

Author(s):

K. Mahendra ◽

N. K. Udayashankar

Keyword(s):

Single Crystal ◽

Crystal Surface ◽

Photon Absorption ◽

Structural Studies ◽

Dye Molecules ◽

Optical Studies ◽

Distribution Of Elements ◽

Potassium Hydrogen ◽

Thermal And Electrical Properties ◽

Dye Molecule

Influence of amaranth dye on the potassium hydrogen oxalate oxalic acid dihydrate (KHOOD) single crystal is investigated. The structural studies were carried out to understand the crystal behavior after dye incorporation. Optical studies were performed to investigate the photon absorption of the crystal with or without the presence of dye molecule. The absorption of pure crystals were also compared with that of amaranth dye-doped crystals and the bandgap was estimated. The surface morphology and the presence of dye molecules are investigated using scanning electron microscope (SEM) and EDX analysis. The elemental mapping was carried out to understand the distribution of elements in the crystal surface. The thermal behavior of the crystal was studied and compared with that of KHOOD and dye-doped KHOOD crystals in detail. The emission properties of the crystals were studied and compared crystal. Field-dependent [Formula: see text]–[Formula: see text] studies were performed to study the conductivity of the crystals and results were discussed in detail.

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Enhanced Absorption in a Reverse Saturable Absorbing Dye Blended with Carbon Nanotubes

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.18409 ◽

2008 ◽

Vol 8 (12) ◽

pp. 6470-6473

Author(s):

Scott Webster ◽

Marisol Reyes-Reyes ◽

Richard Williams ◽

David L. Carroll

Keyword(s):

Carbon Nanotubes ◽

Excited States ◽

Dye Molecules ◽

Two Component System ◽

Enhanced Absorption ◽

Carbocyanine Dye ◽

Two Component ◽

Optical Cross Section ◽

532 Nm ◽

Dye Molecule

Using nonlinear absorption at 532 nm in the nanosecond temporal regime, we have measured the low fluence nonlinear transmittance properties of the reverse saturable absorbing carbocyanine dye, 1,1′,3,3,3′,3′-hexamethylindotricarbocyanine iodide (HITCI), blended with well dispersed carbon nanotubes. The nonlinear optical properties of the blends are strongly dependent on the ratio of dye to nanotubes in solution. In the case where the nanotubes per dye molecule ratio is large, we see a distinctive enhancement in optical fluence limiting properties of the system, suggesting enhanced absorption of the excited states. However, when the nanotube to dye ratio decreases, the system's response is dominated by the behavior of the dye. We suggest that this can be understood as a two component system in which sensitized dye molecules associated with the nanotubes have an effectively different optical cross-section from the dye molecules far from the nanotubes. From classical antennae considerations, this is expected.

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SELF-TRAPPING OF OPTICAL VORTEX BY USING THE MOLECULAR REORIENTATION IN PHOTOSENSITIVE POLYMERIC MATERIALS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863512500129 ◽

2012 ◽

Vol 21 (01) ◽

pp. 1250012 ◽

Cited By ~ 1

Author(s):

RAN TAO ◽

JIANG-ZHUAN ZHU ◽

DONG SHEN ◽

XIAO-YAN GU ◽

DUAN-BIN LUO

Keyword(s):

Methyl Methacrylate ◽

Azo Dye ◽

Green Light ◽

Polymeric Materials ◽

Optical Vortex ◽

Input Power ◽

Molecular Reorientation ◽

Poly Methyl Methacrylate ◽

Self Trapping ◽

Linearly Polarized

Amorphous bulk composites were prepared by doping azo-dye Disperse Red 13 (DR13) in poly(methyl methacrylate) (PMMA) matrices. Photo-induced anisotropy of such kind of bulk polymer material was investigated experimentally by measuring the birefringence when irradiating it with linearly polarized green light. We report the first observation of self-trapping of an optical vortex based on such effect in bulk poly(methyl methacrylate) materials containing photosensitive azo-dye molecules. The dependence of the average core width of a single-charge optical vortex versus time and input power was investigated in detail.

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Pseudocapacitive-dye-molecule-based high-performance flexible supercapacitors

Nanoscale ◽

10.1039/c7nr03385k ◽

2017 ◽

Vol 9 (28) ◽

pp. 9879-9885 ◽

Cited By ~ 10

Author(s):

Jie Yang ◽

Hua Wang ◽

Yun Yang ◽

Jiapeng Wu ◽

Pengfei Hu ◽

...

Keyword(s):

High Performance ◽

Energy Storage Materials ◽

Dye Wastewater ◽

Dye Molecules ◽

Flexible Supercapacitor ◽

Phenothiazine Dyes ◽

Anthraquinone Derivatives ◽

New Type ◽

Redox Centers ◽

Dye Molecule

Two kinds of widely used dye molecules including anthraquinone derivatives and phenothiazine dyes with intrinsic redox centers can be effectively decolorized and resource utilized as pseudocapacitive energy-storage materials. A new type of flexible supercapacitor based on dye wastewater has been successfully fabricated.

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