Preparation of bio-absorbents by modifying licorice residue via chemical methods and removal of copper ions from wastewater

Autor: Xiaochun Yin, Nadi Zhang, Meixia Du, Hai Zhu, Ting Ke
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Water Science and Technology, Vol 84, Iss 12, Pp 3528-3540 (2021)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2021.463
Popis: In this paper, a series of bio-adsorbents (LR-NaOH, LR-Na2CO3 and LR-CA) were successfully prepared by modifying Licorice Residue (LR) with NaOH, Na2CO3 and citric acid, and were used as the adsorbents to remove Cu2+ from wastewater. The morphology and structure of bio-adsorbents were characterized by Fourier Transform Infrared, scanning electron microscopy (SEM), thermogravimetry (TG) and X-ray diffraction (XRD). Using static adsorption experiments, the effects of the adsorbent dosage, the solution pH, the adsorption time, and the initial Cu2+ concentration on the adsorption performance of the adsorbents were investigated. The results showed that the adsorption process of Cu2+ by the bio-adsorbents can be described by pseudo-second-order kinetic model and the Langmuir model. The surface structure of the LR-NaOH, LR-Na2CO3 and LR-CA changed obviously, and the surface-active groups increased. The adsorption capacity of raw LR was 21.56 mg/g, while LR-NaOH and LR-Na2CO3 significantly enhanced this value up to 43.65 mg/g and 43.55 mg/g, respectively. After four adsorption–desorption processes, the adsorption capacity of LR-NaOH also maintained about 73%. Therefore, LR-NaOH would be a promising adsorbent for removing Cu2+ from wastewater, and the simple strategy towards preparation of adsorbent from the waste residue can be a potential approach for use in the water treatment. HIGHLIGHTS Licorice Residue-based biological adsorbents with the ability to remove heavy metal ions were fabricated.; The Cu2+ ions in the water were easily removed using the bio-adsorbents which were made by this study.; The adsorption capacity of Licorice Residue which was modified by NaOH maintained above 73% after four cycles.;
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