Synthesis and thermochemistry of two zinc borates, Zn2B6O11·7H2O and Zn3B10O18·14H2O

A Novel Synthesis of Zinc Borates from a Zinc Oxide Precursor via Ultrasonic Irradiation

“…Sawada et al studied the synthesis of ZB in a two-step reaction of zinc oxide (ZnO) and boric acid (H 3 BO 3 ) at 60 °C for 1.5 h to form crystals, followed by heating to 90 °C for 4 h to enhance crystal growth. 9 Gao and Liu synthesized ZB minerals at the boiling point of the solvent and with a reaction time of 11 h. 10 Chen et al examined the production of ZB nanoflakes (2ZnO · 2B 2 O 3 · 3H 2 O) via the coordination and homogeneous precipitation of ammonia, zinc nitrate (Zn(NO 3 ) 2 · 6H 2 O), and borax (Na 2 B 4 O 7 · 10H 2 O). 2 11 Gürhan et al studied the production of 3.5 mole hydrated zinc borate and investigated the effects of the synthesis conditions on the final product properties considering the reaction kinetics.…”

A novel synthesis of nanoflower-like zinc borate from zinc oxide at room temperature

“…The band at 3350 cm −1 indicates the stretching vibrations of O-H groups as the study [2]. Moreover, from both spectra, the stretching vibrations of the H-O-H bands can be seen between 1500-1800 cm −1 , which are assigned to the crystalline water incorporated in the compound [8]. Moreover, the peak at approximately 457 cm -1 is related to the symmetric stretching of Zn-O, which can be seen in both spectra [22].…”

“…Besides, zinc borate is an important inorganic compound that is commonly used in fireretardant materials [6,7]. In some applications, zinc borate is used as an industrial pigment, an additive in coating owing to the smoke suppressing properties [8,9].…”

“…For example, Gao et al synthesized zinc borate compound using H 3 BO 3 and zinc sulfate ZnSO 4 at room temperature, but it took several days to obtain the full precipitation of zinc borate. The particle size value was missed, but its XRD pattern shows that the size of the synthesized zinc borate could be up to several microns [8]. Acarali et al [9] have fabricated zinc borate from zinc oxide and acid boric in the presence of modifying agents such as propylene glycol, kerosene, oleic acid.…”

Dehydration, Water Vapor Adsorption and Desorption Behavior of Zn[B3O3(OH)5] · H2O and Zn[B3O4(OH)3]

“…2ZnO Á 3B 2 O 3 Á 7H 2 O was obtained by addition of zinc oxide to the aqueous solutions of borax and zinc sulfate at the boiling temperature of water, whereas 3ZnO Á 5B 2 O 3 Á 14 H 2 O was produced from aqueous mixtures of borax, boric acid, and zinc sulfate. [7] 2ZnO Á 3B 2 O 3 Á 3H 2 O was transformed to 4ZnO Á B 2 O 3 Á H 2 O by boiling in boric acid solution. [5] In these products, the B 2 O 3 :ZnO molar ratio changes from 0.25 to 5 and it plays a significant role in the determination of the structure and characteristics of the product.…”