Efficient adsorption removal and adsorption mechanism of basic fuchsin by recyclable Fe3O4@CD magnetic microspheres

• Published in: Journal of Central South University 2021-12, Vol.28 (12), p.3666-3680
• Main Authors: Ning, Jing-heng, Chen, Dong-er, Liu, Yong-le, Huang, Shou-en, Wang, Fa-xiang, Wei, Rui, Hu, Qiong-can, Wei, Jia-qian, Sun, Chang
• Format: Article
• Language: English
• Subjects: Engineering; Metallic Materials
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-021-4845-0

Excessive discharge of dye wastewater has brought serious harm to human health and the environment. In this paper, a magnetic absorbent, ferroferric oxide@ β -cyclodextrin (Fe 3 O 4 @CD), was prepared for the efficient adsorption removal of basic fuchsin (BF) from dye wastewater, based on the special amphiphilicity of β -CD and the strong magnetism of Fe 3 O 4 . A series of influence factors including the initial dye concentration, adsorbent dosage, temperature and pH were investigated, as well as the adsorption mechanism. The results show that Fe 3 O 4 @CD has the best adsorption and removal effect on BF dye at room temperature and neutral pH, when the initial concentration of dye is 25 mg/L and the adsorbent dosage is 100 mg. The adsorption behavior conforms to the pseudo-second-order kinetics and the Langmuir adsorption isotherm, and the adsorption process is spontaneously endothermic. Fe 3 O 4 @CD adsorbed with BF dye can be rapidly separated under an external magnetic field and then easily regenerated by HCl treatment. After 5 times of recycling, the removal rate of the prepared magnetic composite on BF dye is kept above 75%. This work will provide an economic and eco-friendly technology for the treatment of the actual dye wastewater.