Synthesis and characterization of zeolite A from crushed particles of aluminoborosilicate glass used in LCD panels

Abstract

We tried to synthesize zeolite from the sand-like particles of crushed LCD panel glass collected from discarded electronics devices. In the previous study, zeolite A was synthesized using fine glass particles of <10 m. Acid treatment was found effective toward synthesizing single phase zeolite A. Using sand-like coarse glass particles, of which the internal-core consists of glass and the surficial shell transforms into zeolite, we investigated the effect of acid-treatment by evaluating the surface of the coarse glass particles. Under acid-treatment, components other than Si eluted from the glass. The elution amounts were several percent of the total glass mass. After acid-treatment, the surface of the glass particle was discovered to be covered in a thin layer of poor components other than Si and a relatively rich quantity of Si, by scanning electron microscopy and energy dispersive spectrum analysis. The synthesized zeolite A increased the longer the acid-treatment time, which suggest the thin layer increased. When the concentration of the acid solution decreased, glass components other than Si dissolved well, and the synthesized zeolite A increased as a result. This indicates that the Si-rich layer is necessary for preferential synthesis of zeolite A from crushed particles of aluminoborosilicate glass.

Synthesized Zeolite Based on Egyptian Boiler Ash Residue and Kaolin for the Effective Removal of Heavy Metal Ions from Industrial Wastewater

“…The solid wastes containing silica (SiO 2 ) and alumina (Al 2 O 3 ), including industrial waste forms [ 25 , 26 , 27 , 28 , 29 , 30 ] (i.e., paper sludge, coal fly ash, fly ash from heavy fuel oil (HFO) combustion, and oil shale ash) such as alumino-silicate clays [ 31 , 32 , 33 , 34 , 35 ] and biomass [ 36 , 37 , 38 ] could be converted into ecological adsorbents (zeolite). To date, several physico-chemical and solvothermal techniques, including the hydrothermal approach [ 39 , 40 , 41 ], alkali-fusion method [ 42 , 43 , 44 ], sol-gel method [ 45 , 46 , 47 ], microwave method [ 48 , 49 , 50 , 51 ], and alkali-leaching method [ 52 , 53 , 54 , 55 ], have been adopted and developed to produce synthetic adsorbents. Zeolites are crystal formations built on stiff anionic alumino-silicate structures with distinct pores or channels that link at cavities or cages [ 56 ].…”

Synthesis of high value-added Na–P1 and Na-FAU zeolites using waste glass from fluorescent tubes and aluminum scraps

“…To achieve this goal, researches used natural raw materials and low-cost industrial by-products to prepare zeolites (Chaves Lima et al 2019). Inexpensive materials are mainly clays [6][7][8][9] Liu et al, 2019;Yoldi et al, 2019), volcanic glasses [11], Tunisian sand [12,13] or industrial waste products as coal fly, bagasse fly ash [14,9,15], waste sanitary porcelain [16], waste aluminum cans [17], aluminum scraps [12,18,19] and glass wastes [20][21][22][23][24][25][26][27]. Due to the high silica content and its free composition of toxic and hazardous element, glass wastes are important starting materials for zeolite preparation.…”

“…When KOH was employed, 25% of edingtonite has been produced in the final material after one week at 90°C. The e-wastes like LCD panel glass [23] and cathode-ray-tube funnel glass [22] were also used in the preparation of LTA, FAU and NaP1 zeolites. Zeolite HS and NaP1 were prepared using microwave radiation from residue called waste glass cullet [24][25][26].…”

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

“…However, this does not imply that, from a cost perspective, any element is suitable for synthetization. The most widely used methods are hydrothermal [141], alkali-leaching [142], or sol-gel [143]. Each method is employed according to the desired zeolite type to be obtained.…”