New ways to use the red mud waste as raw material for inorganic- organic hybrid hydrogels
| Autor: | Mihaela Florea, Eleonora Luminita Mara, Catalina Paula Spatarelu, Corina Bradu, Rodica Zăvoianu, Teodor Sandu, Elvira Alexandrescu, Dumitru Valentin Dragut, Andrei Sarbu, Anamaria Zaharia, Anita Laura Radu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Waste management
020101 civil engineering Sodium silicate 02 engineering and technology Raw material 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Red mud 0201 civil engineering chemistry.chemical_compound chemistry Chemical engineering Geochemistry and Petrology visual_art Self-healing hydrogels visual_art.visual_art_medium Thermal stability Ceramic 0210 nano-technology Porosity Acrylic acid |
| Zdroj: | International Journal of Mineral Processing. 169:111-118 |
| ISSN: | 0301-7516 |
| Popis: | The present paper was aimed at developing innovative hybrid composites by using cheap filler, like red mud (RM). The study importance refers to RM recycling, a recent trend in environmental science. Besides its causticity, large amounts of RM are produced yearly, calling for recovery measurements. Herein, poly (acrylic acid)- based inorganic-organic hybrid hydrogels (PAA hydrogels) incorporating RM were synthesized. Furthermore, the possibility of involving inorganic additives (kaolin and/or sodium silicate) together with RM was investigated. Incorporation of all three inorganic compounds (RM + Kaol + Sil) in hydrogels was also evaluated, novel hybrids being prepared. The obtained hybrids were characterized by different techniques (DR UV-VIS; DRIFT; TGA/DTG; SEM) and in terms of swelling behavior. DRIFT and DR UV-VIS confirmed the occurrence of characteristic bands of raw materials. Final properties (water uptake, thermal stability, porosity) can be controlled by modifying preparation conditions. Hydrogels yielded, by calcinations, iron- rich ceramic foams, able to promote water removal of sulfide ions from wastewaters. |
| Databáze: | OpenAIRE |
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