scholarly journals Effect of Temperature and Time on Zinc Borate Species Formed from Zinc Oxide and Boric Acid in Aqueous Medium

2007 ◽  
Vol 46 (8) ◽  
pp. 2367-2371 ◽  
Author(s):  
H. Emre Eltepe ◽  
Devrim Balköse ◽  
Semra Ülkü
Keyword(s):  
Zinc Oxide ◽  
Boric Acid ◽  
Aqueous Medium ◽  
Zinc Borate ◽  
Effect Of Temperature

Scale-up synthesis of zinc borate from the reaction of zinc oxide and boric acid in aqueous medium

2010 ◽  
Vol 312 (22) ◽  
pp. 3361-3366 ◽  
Author(s):  
Mert Kılınç ◽  
Gaye Ö. Çakal ◽  
Sertan Yeşil ◽  
Göknur Bayram ◽  
İnci Eroğlu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Boric Acid ◽  
Aqueous Medium ◽  
Scale Up ◽  
Zinc Borate

scholarly journals A novel approach for the production of zinc borate (4ZnO·B2O3·H2O) using a single-step hydrothermal method

2020 ◽  
Vol 44 (1) ◽  
pp. 1-8
Author(s):  
Ali Yalçın ◽  
Mehmet Gönen
Keyword(s):  
Zinc Oxide ◽  
Reaction Time ◽  
Boric Acid ◽  
Heterogeneous Reaction ◽  
Fire Retardant ◽  
Sem Analysis ◽  
Single Step ◽  
Hot Water ◽  
Zinc Borate ◽  
Novel Approach

Abstract Zinc borate having the formula of 4ZnO·B2O3·H2O has been used as a fire retardant for polymers requiring high processing temperatures since it has a high dehydration temperature (around 415°C). The effects of reaction time, reaction temperature were investigated on the heterogeneous reaction between solid zinc oxide and boric acid solution. A stoichiometric amount of zinc oxide and 5.0% excess boric acid were used in experiments and the other parameters, mixing speed (1700 rpm), the solid-liquid ratio of 20%, and the amount of seed crystal (3.9% wt) were kept constant for all experiments. A 91.1% conversion was obtained at 120°C for 5 h of reaction time. Precipitated product was filtered and washed by hot water to remove the excess boric acid. Finally it was dried until reaching to a constant mass in an air circulating oven at 105°C. Powder products were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). FTIR spectrum and XRD pattern of powders are consistent with data of the zinc borate given in the literature. According to SEM analysis, whiskers are less than 1 μm in diameter and their lengths are in the range of 1–10 μm.

Effect of Zinc, Zinc Oxide and Zinc Borate on the Flammability of Polycarbonate

1995 ◽  
Vol 13 (3) ◽  
pp. 224-234 ◽  
Author(s):  
Ramazan Benrashid ◽  
Gordon L. Nelson ◽  
Donald J. Ferm ◽  
Leland W. Chew
Keyword(s):  
Zinc Oxide ◽  
Heat Release ◽  
Oxygen Index ◽  
Ohio State University ◽  
Zinc Borate ◽  
State University ◽  
Dsc Studies ◽  
Release Studies ◽  
Chamber Studies ◽  
Smoke Chamber

Polycarbonate was blended with zinc, zinc borate (2ZnO·3B2O 3·3.5H2O) and zinc oxide. Blends made of zinc/polycarbonate and especially zinc borate/polycarbonate show major improvement in oxygen index values. Ohio State University (OSU) heat release studies show reduction in heat release only for zinc borate/polycarbonate blends compared to virgin polycarbonate. No improvement in smoke suppression was observed from NBS Smoke Chamber studies for these blends. From DSC studies there was a low ering of Tg's. Thermogravimetric analyses show the blends have lower tempera ture stability in nitrogen (50% weight loss) compared to a control.

Effects of nano-sized zinc oxide and zinc borate impregnation on brown rot resistance of black pine (Pinus nigraL.) wood

2013 ◽  
Vol 8 (4) ◽  
pp. 242-244 ◽  
Author(s):  
Charalampos Lykidis ◽  
George Mantanis ◽  
Stergios Adamopoulos ◽  
Konstantina Kalafata ◽  
Ioannis Arabatzis
Keyword(s):  
Zinc Oxide ◽  
Brown Rot ◽  
Zinc Borate ◽  
Black Pine

scholarly journals Photocatalytic Degradation of Textile Dyeing Wastewater Using Titanium Dioxide and Zinc Oxide

2008 ◽  
Vol 5 (2) ◽  
pp. 219-223 ◽  
Author(s):  
Abbas J. Attia ◽  
Salih H. Kadhim ◽  
Falah H. Hussein
Keyword(s):  
Activation Energy ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Effect Of Temperature ◽  
Dyeing Wastewater ◽  
Textile Dyeing ◽  
Textile Factory ◽  
Textile Dyeing Wastewater

Photodegradation of a real textile dyeing wastewater taken from Hilla textile factory in Babylon Governorate, Iraq have been investigated. Photocatalytic degradation was carried out over suspensions of titanium dioxide or zinc oxide under ultraviolet irradiation. Photodegradation percentage was followed spectrophometrically by the measurements of absorbance at λmax equal to 380 nm. The rate of photodegradation increased linearly with time of irradiation when titanium dioxide or zinc oxide was used. A maximum color removal of 96% was achieved after irradiation time of 2.5 hours when titanium dioxide used at 303K and 82% color reduction was observed when zinc oxide used for the same period and at the same temperature. The effect of temperature on the efficiency of photodegradation of dyestuff was also studied. The activation energy of photodegradation was calculated and found to be equal to 21 ± 1 kJ mol-1 on titanium dioxide and 24 ± 1 kJ mol-1 on zinc oxide.

scholarly journals Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 346 ◽  
Author(s):  
Franco ◽  
Sacco ◽  
De Marco ◽  
Vaiano
Keyword(s):  
Zinc Oxide ◽  
Crystal Violet ◽  
Zno Nanoparticles ◽  
Treatment Time ◽  
Irradiation Time ◽  
Effect Of Temperature ◽  
Antisolvent Precipitation ◽  
Supercritical Antisolvent ◽  
Crystal Violet Dye ◽  
Mean Diameter

In this work, the synthesis of zinc oxide (ZnO) photocatalyst from thermal decomposition of zinc acetate (ZnAc) nanoparticles obtained by supercritical antisolvent (SAS) precipitation was investigated. The optimization of calcination conditions of the SAS ZnAc was carried out, studying the effect of temperature (in the range 300–600 °C) on the production of ZnO nanoparticles. In particular, it was demonstrated that the organic residues in ZnO and its particle size, thus the specific surface area, strongly affect the photocatalytic performances. SAS micronization of ZnAc produces regular nanoparticles with a mean diameter of about 54.5 ± 11.5 nm, whereas unprocessed ZnAc is characterized by very large crystals. The experimental results evidenced that ZnAc prepared by SAS process calcined at 500 °C showed a regular nanometric structure (mean diameter: 65.0 ± 14.5 nm) and was revealed to be the best choice for the photocatalytic removal of crystal violet dye (CV). In fact, the photocatalytic activity performances of ZnO nanoparticles prepared by this route were higher with respect to that of ZnO from unprocessed ZnAc calcined at 500 °C (which is characterized by irregular tetrapods with mean size 181.1 ± 65.5 nm). The optimized photocatalyst was able to assure the complete CV decolorization in 60 min of UV irradiation time and a mineralization degree higher than 90% after 120 min of treatment time.

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