Simultaneous Recovery of Display Panel Waste Glass and Wastewater Boron by Chemical Oxo-precipitation with Fluidized-Bed Heterogeneous Crystallization

Abstract

Silica-based carrier is a promising material for recovery of metal and nonmetal contaminants in chemical oxo-precipitation-fluidized bed crystallization (COP-FBC) system. Boron species are an essential element for plant growth and can cause health concerns in human beings at high concentrations in water environments. The composition of thin-film transistor liquid crystal display (TFT-LCD) contains a wide variety of metal oxides and can be tailored as promising functional mesoporous carriers for boron crystallization recovery in the presence of barium ions and hydrogen peroxide. In this study, waste-derived mesoporous aluminosilicate (MAS) nanomaterial in the presence of barium ions and hydrogen peroxide was used as a carrier for sustainable recovery of crystallized boron, a priority wastewaters pollutant. The MAS shows the hierarchically homogeneous distribution of nanostructured aluminosilicate particles with an average size of 12.8 ± 3.6 nm on the surface after the activation with Na 2 CO 3 at 1000 °C. Moreover, the negatively charged surface and the mesoporous structure of MAS enhance the adsorption of Ba 2+ onto MAS, and the Langmuir adsorption capacity of 105 mg/g is achieved, which is conducive to the enhancement of the recovery of boron species. Moreover, the recovery efficiency and crystallization ratio of boron by MAS can be up to 84.5 and 93.4%, respectively. The cross-sectional scanning electron microscopy images and the high-temperature X-ray diffraction results confirm the boron recovery mechanism that the negatively charged functional group as well as the mesoporosity of MAS triggers the rapid formation of needle-shaped precipitates of barium peroxoborate, and then converted to barium borate after calcination at 1050 °C. Results obtained in this study clearly demonstrate the possibility of fabricating environmentally benign mesoporous aluminosilicate adsorbents from TFT-LCD waste to sustainably recover and crystallize boron species from water and wastewater in COP-FBC.

Transformation of Glass Fiber Waste into Mesoporous Zeolite-Like Nanomaterials with Efficient Adsorption of Methylene Blue

“…It is noted that our previous study used glass base waste material to prepare the mesoporous aluminosilicate using alkaline activation. The mean particle size was 12.8 nm after melting at more than 800 • C [6], confirming that a novel mesoporous material could develop at a lower temperature with hydrothermal reaction.…”

“…The development of a novel nanomaterial composed of glass fiber waste (GFW) should be seen as a sustainable mainstream economic and ecological means of reducing resource consumption and conserving energy. Hence, the previous studies related to this field have prepared porous material from glass-based waste, such as waste-derived mesoporous aluminosilicate (MAS) nanomaterial fabricated from TFT-LCD panel waste, to be used as a carrier to recover boron [6]. Additionally, mesoporous aluminosilicate composite (M-ANC) was developed and used as an adsorbent to capture toxic heavy-metal ions in an aqueous solution [7].…”

Analysis of the Products and Decomposition Mechanisms of the Different Organic Impurities in Waste Glass during the Heat-Desiccation Dissociation Process

“…Glass is one of the most widely used materials in the world . Because of its acid and alkali resistance, good thermal conductivity, strong stability, high transparency, and high strength, it is widely employed in various fields such as construction, home furnishing, transportation, and industry . With the rapid development of society and economy, the demand for glass is increasing.…”