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Cuong Nguyen, X.; Thanh Huyen Nguyen, T.; Hong Chuong Nguyen, T.; Van Le, Quyet; Yen Binh Vo, T.; Cuc Phuong Tran, T.; Duong La, D.; Kumar, Gopalakrishnan; Khanh Nguyen, V.; Chang, S. Woong; Jin Chung, W.; Duc Nguyen, D.
Chemosphere (Oxford), November 2021, 2021-11-00, 20211101, Letnik: 282Journal Article
This study investigated methyl orange (MO) dye adsorption using three biochars produced from agro-waste and invasive plants; the latter consisted of wattle bark (BA), mimosa (BM), and coffee husks (BC). BC had the lowest specific surface area (2.62 m2/g) compared to BA (393.15 m2/g) and BM (285.53 m2/g). The adsorption efficiency of MO was stable at pH 2–7 (95%–96%), whilst it had reduced stability at pH 7–12. Between 0 and 30 min, MO adsorption efficiency was >82%, and at 120 min, representative adsorption equilibrium had occurred. The maximum adsorption capacity of the biochars was 12.3 mg/g. The underlying adsorption mechanisms of the three biochars were governed by electrostatic adsorption and pore diffusion. There was an abundance of active sites for adsorption in BA and BM, while chemical adsorption appeared to be more vital for BC, as it contained more functional groups on its surface. The highest MO adsorption efficiency occurred with BM. BC was not recommended for MO removal, as it was observed to stain the water when a dose exceeding 5.0 g/L was utilized. Display omitted •Biochars were successfully derived from agro-waste and invasive plants.•After only 30 min the methyl orange adsorption efficiency on biochar was more than 82%.•The adsorption equilibrium was established at 120 min.•The highest adsorption occurred with biochar from mimosa.
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