Synthesis, characterization and luminescent properties of mixed phase bismuth molybdate-doped with Eu3+ ions

Red phosphors of Eu[Formula: see text]-doped bismuth molybdate (BMO) are prepared by a low temperature hydrothermal method assisting with Phenol Formaldehyde resin (PFr), and characterized by X-ray diffraction (XRD) patterns, Fourier transform infrared-spectroscopy (FT-IR), thermogravimetric analyzer (TGA), differential thermal analyzer (DTA), and photoluminescence (PL) spectroscopy. PL properties influence factors including molar ratio of Bi[Formula: see text] and Mo[Formula: see text] ions, PFr dosage and dopants concentration are discussed in detail. The results show that BMO can act as a useful host for Eu[Formula: see text] ions doping, and energy transferring from Bi[Formula: see text] to Eu[Formula: see text] achieved efficiently, the BMO phosphors displayed intense red color emission under ultraviolet light excitation.

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Study on Diallyl Phthalate Modified Phenol-Formaldehyde Resin

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.467.185 ◽

2013 ◽

Vol 467 ◽

pp. 185-191

Author(s):

Min Zhen Bao ◽

Hong Wei Yu ◽

Bin Fu Bao ◽

Yuan Cao

Keyword(s):

Phenolic Resin ◽

Phenol Formaldehyde ◽

Loss Modulus ◽

Phenol Formaldehyde Resin ◽

Curing Temperature ◽

Quinone Methide ◽

Formaldehyde Resin ◽

Scanning Calorimetry ◽

Thermal Analyzer ◽

Diallyl Phthalate

This paper aimed to produce the alkaline phenolic resin by the addition of diallyl phthalate into traditional phenolformaldehyde resin. Then the modified resin was characterized using dynamic mechanical analyzer (DMA), differential scanning calorimetry (DSC), fourier transform infrared spectrometer (FTIR) and simultaneous thermal analyzer (STA). The results indicated that: the increase of the diallyl phthalate contributed to the rise of the storage modulus (E) and loss modulus (E), the decrease of the loss factor. Curing temperature also showed a decline trend and was decreased by 5°Cwhen the amount of modifider was 2.5% of the phenol. The improvemnt of Organic ester on curing of alkaline phenolic resin achieved by rapidly promoting resin molecular to generate reactive intermediate quinone methide. The amount of the modifier had little effect on the thermostability of resin, but it reduced the bonding strength of plywood.

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Resinification of Factory-Sawdust in Phenol and Optimum Resinification Processing Parameters

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.710.142 ◽

2013 ◽

Vol 710 ◽

pp. 142-146

Author(s):

Hai Jiao Kang ◽

Qiu Hui Zhang

Keyword(s):

Sodium Hydroxide ◽

Phenol Formaldehyde ◽

Orthogonal Experiment ◽

Chemical Properties ◽

Processing Parameters ◽

Phenol Formaldehyde Resin ◽

Molar Ratio ◽

Formaldehyde Resin ◽

Wood Residues ◽

Orthogonal Experiment Method

In order to make full use of wood residues, in this study, we aimed to synthesize resol phenol-formaldehyde resin from liquefied factory-sawdust in phenol in which phenol is 5 times to factory-sawdust in presence of sulfuric acid as catalyst. By using the orthogonal experiment method, the molar ratio of formaldehyde to liquefied factory-sawdust in phenol (LSP) [n (F):n (LSP)], the molar ratio of sodium hydroxide to liquefied factory-sawdust in phenol [n (NaOH) : n (LSP)], the resinification temperature and the resinification time on chemical properties of liquefied sawdust resins (LSR) were investigated. The results show that the ratio of sodium hydroxide to liquefied factory-sawdust in phenol plays the most important role in the processing of resinification, the ratio of formaldehyde to liquefied factory-sawdust in phenol follows, the resinification time and the resinification temperature come to the last two. The optimum processing conditions are as follows: [n (NaOH) : n (LSP)]=0.5, [n (F) : n (LSP)]=2.0, resinification temperature is 80 °C and resinification time is 3.0h. The physical properties of the poplar three-layer plywood bonded with LSR were similar to those with normal PF resins and also satisfied the demands of I level.

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Hydrothermal method for Y2O3:Eu3+ uniform nanophosphors with different templates

Modern Physics Letters B ◽

10.1142/s0217984919502270 ◽

2019 ◽

Vol 33 (20) ◽

pp. 1950227

Author(s):

Xue Jiang ◽

Weihong Wu ◽

Yuqian Li ◽

Xiaoqing Guo ◽

Nan Wang ◽

...

Keyword(s):

Hydrothermal Method ◽

Phenol Formaldehyde ◽

Gum Arabic ◽

Phenol Formaldehyde Resin ◽

Formaldehyde Resin ◽

X Ray Diffraction ◽

Structural And Optical Properties ◽

Sem Images ◽

X Ray ◽

Xrd Patterns

In this study, [Formula: see text]-doped yttrium oxide nanophosphors were prepared using the hydrothermal method assisting with the polyacrylic acid (PAA), phenol formaldehyde resin precursor (PF), and gum arabic (GA), respectively and their structural and optical properties were studied. X-ray diffraction (XRD) patterns of the samples can be well indexed to the cubic structure. Additionally, scanning electron microscopy (SEM) images showed that the samples were different morphologies, via combining with different templates. The luminescence results revealed that the addition of templates have a significant influence on the luminescence properties of [Formula: see text]-doped [Formula: see text].

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Purification of water contaminated with heavy metals by example of lead as promising material based on graphene nanostructures

Perspektivnye Materialy ◽

10.30791/1028-978x-2020-9-34-43 ◽

2020 ◽

pp. 34-43

Author(s):

N. R. Memetov ◽

◽

A. V. Gerasimova ◽

A. E. Kucherova ◽

◽

...

Keyword(s):

Adsorption Process ◽

Phenol Formaldehyde ◽

Phenol Formaldehyde Resin ◽

Formaldehyde Resin ◽

Parameter Estimates ◽

Maximum Adsorption Capacity ◽

Ecological Situation ◽

Characteristic Parameters ◽

Purification Of Water ◽

Graphene Nanostructures

The paper evaluates the effectiveness of the use of graphene nanostructures in the purification of lead (II) ions to improve the ecological situation of water bodies. The mechanisms and characteristic parameters of the adsorption process were analyzed using empirical models of isotherms at temperatures of 298, 303, 313 and 323 K, which correspond to the following order (based on the correlation coefficient): Langmuir (0.99) > Temkin (0.97) > Dubinin – Radushkevich (0.90). The maximum adsorption capacity of the material corresponds to the range from 230 to 260 mg/g. We research the equilibrium at the level of thermodynamic parameter estimates, which indicates the spontaneity of the process, the endothermic nature and structure change of graphene modified with phenol-formaldehyde resin during the adsorption of lead (II) ions, leading to an increase in the disorder of the system.

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