Windshield-waste-driven synthesis of hydroxy sodalite

Abstract

We demonstrated the synthesis of hydroxy sodalite (HS) via a simple hydrothermal process using windshield waste as the source material. Acid-treated waste glass was directly used as the silicate precursor. The syntheses were conducted under various NaOHprecursor contents for 1, 12, and 24 h. The crystal structure and morphology of the HS were identified by X-ray diffraction and field-emission scanning electron microscopy. As per the results of the analyses, the HS and zeolite-A phases formed with low NaOH content, but HS was successfully synthesized in a single phase with a Na 2 O:SiO 2 :Al 2 O 3 molar ratio of 2.2:1:1 over the course of 24 h. For uniform and high-purity HS crystals, the sizes of the particles of windshield waste were reduced via a highenergy milling process, and then we conducted the hydrothermal procedure under same conditions. Finally, uniformly sized HS crystals were produced with an average diameter of 3¯m. These optimized conditions were not only scientifically valuable to understand the formation process, but this process should also accelerate windshield-waste recycling.

Boron doping effect on the structural, spectral properties and charge transfer mechanism of orthorhombic tungsten bronze β-SrTa2O6:Eu3+ phosphor

“…[3][4][5][6][7] SrTa 2 O 6 occurs as three different polymorphs in SrO-Ta 2 O 5 system. [6][7][8][9] Two polymorphs of SrTa 2 O 6 are related to TB symmetry and occur at high temperatures. The b-SrTa 2 O 6 crystallizes at temperatures between 1300-1500 °C, while the b ′ -SrTa 2 O 6 forms at temperatures over 1500 °C.…”

“…The b-SrTa 2 O 6 crystallizes at temperatures between 1300-1500 °C, while the b ′ -SrTa 2 O 6 forms at temperatures over 1500 °C. [6][7][8][9] The other polymorph is orthorhombic a-SrTa 2 O 6 occurs at about 1100 °C and below. However, the synthesis of a-SrTa 2 O 6 is difficult with the solid state reaction, so it can be produced by the ux method using strontium borate.…”

“…This difference affects its physical properties, that b ′ -SrTa 2 O 6 polymorph has better dielectric properties compared to b-SrTa 2 O 6 . 8,9 The b-SrTa 2 O 6 is orthorhombic with space group Pnam and lattice parameters a = 12.37 Å, b = 12.43 Å, c = 7.72 Å, V = 1187.70 Å 3 , Z = 10. 8,9 The b ′ -SrTa 2 O 6 is tetragonal with space group P4/mbm and lattice parameters a = 12.47 Å, c = 3.90 Å, V = 606.27 Å 3 , Z = 5.…”

“…8,9 The b-SrTa 2 O 6 is orthorhombic with space group Pnam and lattice parameters a = 12.37 Å, b = 12.43 Å, c = 7.72 Å, V = 1187.70 Å 3 , Z = 10. 8,9 The b ′ -SrTa 2 O 6 is tetragonal with space group P4/mbm and lattice parameters a = 12.47 Å, c = 3.90 Å, V = 606.27 Å 3 , Z = 5. 8,9 The comparison of the two tungsten bronze polymorphs shows that the orthorhombic distortion of b-SrTa 2 O 6 to b ′ -SrTa 2 O 6 is accompanied by an expansion of the TaO 6 octahedral with narrowing of the (Sr 2 )O 13 tricapped pentagonal prisms.…”

Limitation of the environmental impact of ashes from combustion of sewage sludge by the synthesis of zeolites

“…This feature provides many advantages, particularly the access to small molecules like ammonia and water. Therefore hydroxy sodalite is an attractive material for wide applications, such as hydrogen separation, catalysts and pigment occlusion [35][36]. Samples S5-S8 and S13-S16 obtained as a result of zeolitization with the direct hydrothermal method are characterized by a greater diversity of identified phases in comparison to samples from the indirect fusion method.…”