Re-utilization of Chinese medicinal herbal residue: waste wormwood rod-derived porous carbon as a low-cost adsorbent for methyl orange removal

Autor: Shuhui Wang, Yu Huang, Yiting Wu, Xinyu Zhang, Liu Wan, Xiang Liu, Wanju Zhang
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Water Science and Technology, Vol 84, Iss 9, Pp 2601-2614 (2021)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2021.453
Popis: A cost-effective approach was applied to prepare porous carbon samples by the simple carbonization of wormwood rod followed by salt activator (NaCl) activation. The effect of preparation parameters on the characteristics of the wormwood rod-based porous carbons (WWRs) were studied. The properties of these samples were investigated by SEM, BET surface area, X-ray diffraction, FT-IR spectra and X-ray photoelectron spectrometer. The prepared WWRs were applied as new adsorbent materials to remove methyl orange (MO). The experimental results indicated that WWR-800 activated at 800 °C possesses the best adsorption performance. Several factors that affected the adsorption property of the system such as the solution pH, dosing of adsorbent, initial dye concentration and ionic strength were examined. In addition, the thermodynamic parameters and kinetic parameters of MO with WWR-800 were studied. The results indicated that the adsorption of MO on WWR-800 was an endothermic process and non-spontaneous under standard conditions. The maximum equilibrium adsorption capacity of MO on WWR-800 was 454.55 mg/g. After five adsorption/desorption cycles, the adsorption capacity of MO on WWR-800 remained at 94%, which indicated that wormwood rod-based porous carbon possessed good reusability. HIGHLIGHTS Porous carbon (WWR-800) was synthesized from waste wormwood rod by NaCl activation.; The factors that affected the adsorption property of methyl orange on WWR-800 were systematically explored.; WWR-800 followed the Langmuir model for methyl orange dye.; The adsorption of MO on WWR-800 was endothermic and non-spontaneous under standard conditions.; WWR-800 provided good reusability and stability for adsorption.;
Databáze: Directory of Open Access Journals
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