Valorization of an Electronic Waste-Derived Aluminosilicate: Surface Functionalization and Porous Structure Tuning

Abstract

This study involves the sustainable development of an ion exchange material with ultrahigh heavy metal uptake capacity from a waste material, originally destined for landfills. In this study, a promising thermo-alkaline reaction has been employed to simultaneously alter the surface chemistry and tune the textural properties of the waste-derived aluminosilicate. The effects of several reaction variables on the formation of mesotunnels in the structure of the material have been examined. Also, the surface characterization of the functionalized aluminosilicate has demonstrated that the functionalization reaction results in the cleavage of the robust T–O–T′ linkages (where T and T′ = Si or Al) into T–O– moieties, counterbalanced by an alkali metal cation, resulting in the coverage of the aluminosilicate surface with active ion exchange sites. Comparison of the ion exchange capacity of the functionalized aluminosilicate with those of the commercial ion exchange resins has proven exceptionally higher heavy metal uptake for the former. The ultrahigh heavy metal uptake of this material is ascribed to the high concentration of developed counterbalancing cations on the material surface. The attractiveness of this innovative approach is manifested by the dual environmental benefit, i.e., sustainable upcycling of a waste formerly deposited in landfills and its utilization for heavy metal-laden wastewater treatment.

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

“…This was mainly due to the ranks derived from the delta values compared to the relative magnitude of effects [33]. Herein, the activating agent ratio and activation time are the most critical factors for the hydrothermal-alkaline reaction because of its having a significant tunneling effect on cleavage of the tetrahedrally coordinated cages of Si-O-Si linkage connected via bridging oxygens (BO) into reactive Si-O − clusters, where an alkali metal cation establishes charge neutrality for the negatively charged nonbridging oxygens (NBOs) [34], resulting in getting a high surface area with functional activate sites on the mesoporous zeolite-like surface. Therefore, the MB adsorption capacity of the mesoporous zeolite-like nanomaterial under the optimized reaction parameters has been shown by Taguchi methods.…”

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

“…29 Besides, Ca 2+ and Mg 2+ , serving as charge compensators of AlO 4 – clusters, would migrate into the aluminosilicate surface when the Al-containing tetrahedral network is ruptured. 32 Therefore, the negatively charged surface and mesoporous structure of MAS enhance the adsorption of Ba 2+ onto MAS, which may provide high affinity toward the nucleation of barium peroxoborate precipitate during the boron recovery in the COP-FBC process.…”

Effective Surface Area Tuning of Noble Metal-Free CuBO2/rGO Nanohybrid for Efficient Hydrogen Production with “On–Off” Switching

“…FTIR analysis (Figure b) reveals a broad band around 3000–3700 cm –1 , assigned to O–H stretching vibration . Bands at 632, 1056, 1110, 1380, and 1450 cm –1 are attributed to the Cu–O bond (optically active lattice vibration in the oxide), C–O stretching, C–O–C stretching, C–OH, and the bending mode of B–O bonds, respectively. − The transmission bands at 1560, 1632, 1715, 2340, and 2935 cm –1 are labeled as a typical carboxylate (COO – ) functional group, -OH bending vibration, a signal originating from the surface-adsorbed H 2 O, a CO group (carbonyl), a typical CO asymmetric stretching vibration line, and aliphatic C–H stretching accordingly. ,,, …”

“…28−31 The transmission bands at 1560, 1632, 1715, 2340, and 2935 cm −1 are labeled as a typical carboxylate (COO − ) functional group, -OH bending vibration, a signal originating from the surfaceadsorbed H 2 O, a CO group (carbonyl), a typical CO asymmetric stretching vibration line, and aliphatic C−H stretching accordingly. 27,28,32,33 Raman study was carried out for the hybrids, and the results are presented in Figure 1c. The typical peak at 1343 cm −1 is related to the vibration of carbon atoms with dangling bonds at the edge of the plane of disordered graphite and is assigned as the D band.…”