From spent Mg/Al layered double hydroxide to porous carbon materials

Laipan, Minwang, Zhu, Runliang, Chen, Qingze, Zhu, Jianxi, Xi, Yunfei, Ayoko, Godwin A., & He, Hongping (2015) From spent Mg/Al layered double hydroxide to porous carbon materials. Journal of Hazardous Materials, 300, pp. 572-580.

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Adsorption has been considered as an efficient method for the treatment of dye effluents, but properdisposal of the spent adsorbents is still a challenge. This work attempts to provide a facile methodto 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 washedwith acid to obtain porous carbon materials. Thermogravimetric analysis results suggested that thecarbonization 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 m2/g and 1.67 cm3/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.

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ID Code: 92195
Item Type: Journal Article
Refereed: Yes
Keywords: Calcined layered double hydroxide, Dye effluents treatment, Spent adsorbent recycling, Porous carbon material, Volatile organic compound
DOI: 10.1016/j.jhazmat.2015.07.057
ISSN: 0304-3894
Divisions: Current > QUT Faculties and Divisions > Chancellery
Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier
Deposited On: 21 Jan 2016 05:16
Last Modified: 21 Jan 2016 22:37

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