Preparation of nano-Fe3O4@tea waste/calcium alginate magnetic composited bead and it's adsorption characteristics and mechanisms for methylene blue from aqueous solution

被引：0
|
作者：
Gong X. [1 ,2 ]
Li M. [2 ]
Yang K. [1 ]
Wu Z. [1 ]
Wang Z. [1 ]
Lv G. [1 ]
Wu Z. [1 ]
机构：
[1] Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, Ecology and Resources Engineering College, Wuyi University, Wuyishan
[2] Engineering Research Center of Environment-Friendly Functional Materials, College of Material Science and Engineering, Huaqiao University, Xiamen
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 02期
关键词：
Adsorption; Beads; Magnetic separation; Methylene blue; Sodium alginate; Tea waste;
D O I：
10.13801/j.cnki.fhclxb.20200507.002
中图分类号：
学科分类号：
摘要：
Nano-Fe3O4 particles were deposited on the surface of tea waste (TW) by co-precipitation method to form tea waste@nano-Fe3O4 magnetic composited material, and then spherical tea waste@nano-Fe3O4/calcium algnate (TW@nano-Fe3O4/CA) magnetic beads were prepared by sol-gel approach. The magnetic composites were characterized by SEM, XPS, XRD, vibrating sample magnetometer (VSM) and universal testing machine. The adsorption properties and mechanism of methylene blue (MB) from aqueous solution onto the beads were studied. The results show that the TW@nano-Fe3O4/CA beads possess a good magnetic response, with the diamters ranges from 1.2 mm to 1.7 mm. The composited beads display a rough and folded surface morphology and porous inner structure. The diameters and magnetic response of the beads increase while the adsorption abilities of MB decrease with the increasing content of TW@nano-Fe3O4 in the beads. The adsorption kinetics followed is second order, and the adsorption isotherm data are well fitted to Langmuir model. The adsorption process of MB onto the beads is spontaneous, entropy decreased and exothermic process. The Langmuir maximum adsorption capacity of MB onto the beads with 80% mass fraction of TW@nano-Fe3O4 is found to be 272.5 mg·g−1 at 303 K, which is increased by 86.7% than TW. The adsorbent shows satisfactory regeneration and recycling utiliziation performance. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.
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页码：424 / 438
页数：14
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