Encapsulation of toxic heavy metals from waste CRT using calcined kaolin base-geopolymer
| Autor: | Edgar J. López-Naranjo, M. Rivera-Muñoz Eric, H.R. Guzmán-Carrillo, Alejandro Manzano-Ramírez, J.R. Gasca-Tirado, J.J. Pérez-Bueno, M. Apátiga-Castro Luis, J.M. López-Romero, C. Feregrino-Montes, Jorge Pineda-Piñón |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Metallurgy chemistry.chemical_element Barium 02 engineering and technology Raw material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness 0104 chemical sciences law.invention Geopolymer chemistry law General Materials Science Calcination Leaching (metallurgy) Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Materials Chemistry and Physics. 257:123745 |
| ISSN: | 0254-0584 |
| Popis: | Hazardous materials like barium and lead present in discarded Cathode Ray Tubes, CRT's, may represent a big problem to the environment if they are not properly disposed. In the present study, solidification/stabilization of crushed waste CRT (CRT glass particles), through a calcined kaolin base-geopolymer as metal-immobilizer is presented. Two different compositions of raw materials using 5, 10, and 20% wt of CRT glass particles were studied. The geopolymers were analyzed by XRD, SEM, TG-DTA/DSC, FTIR, leaching tests. The microhardness of coatings on mild steel was tested. The results and the differences in properties are explained based on the microstructure evolution of the geopolymer with CRT glass particles. The results showed that low alkaline medium was effective in the encapsulation of toxic heavy metals from the CRT glass even though they were used as coatings on mild steel samples. |
| Databáze: | OpenAIRE |
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