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From spent Mg/Al layered double hydroxide to porous carbon materials
- Source :
- Journal of Hazardous Materials. 300:572-580
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Adsorption has been considered as an efficient method for the treatment of dye effluents, but proper disposal of the spent adsorbents is still a challenge. This work attempts to provide a facile method to reutilize the spent Mg/Al layered double hydroxide (Mg/Al-LDH) after the adsorption of orange II (OII). Herein, the spent hybrid was carbonized under the protection of nitrogen, and then washed with acid to obtain porous carbon materials. Thermogravimetric analysis results suggested that the carbonization could be well achieved above 600°C, as mass loss of the spent hybrid gradually stabilized. Therefore, the carbonization process was carried out at 600, 800, and 1000°C, respectively. Scanning electron microscope showed that the obtained carbon materials possessed a crooked flaky morphology. Nitrogen adsorption-desorption results showed that the carbon materials had large BET surface area and pore volume, e.g., 1426 m(2)/g and 1.67 cm(3)/g for the sample carbonized at 800°C. Moreover, the pore structure and surface chemistry compositions were tunable, as they were sensitive to the temperature. Toluene adsorption results demonstrated that the carbon materials had high efficiency in toluene removal. This work provided a facile approach for synthesizing porous carbon materials using spent Mg/Al-LDH.
- Subjects :
- Thermogravimetric analysis
Environmental Engineering
Carbonization
Scanning electron microscope
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Pollution
Toluene
Nitrogen
chemistry.chemical_compound
Adsorption
chemistry
Chemical engineering
Environmental Chemistry
Hydroxide
Organic chemistry
Waste Management and Disposal
BET theory
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 300
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....667b0474dab18373321d19bbcb1be50d