Preparation of Magnetic Composite Hollow Microsphere and Its Adsorption Capacity for Basic Dyes
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- 作者：Honglei Zhang ; Xiangcun Li ; Gaohong He ; Jingjing Zhan ; Dan Liu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：November 27, 2013
- 年：2013
- 卷：52
- 期：47
- 页码：16902-16910
- 全文大小：465K
- 年卷期：v.52,no.47(November 27, 2013)
- ISSN：1520-5045
文摘
Magnetic microspheres with an Fe3O4 core and a SiO2鈥揟iO2 hybrid shell were prepared by a surfactant-assisted aerosol process and subsequent etching treatment. The core鈥搒hell spheres with robust and chemically stable Ti鈥揙鈥揝i shells exhibit excellent adsorption performance toward basic dyes. The maximum adsorption capacities were obtained at 147 mg/g for methylene blue (MB) and 124.6 mg/g for basic fuchsin. MB with an initial concentration of 20 mg/L can be completely removed in 5 min at a dosage of 0.5 mg/L, and the equilibrium time is 90 min in the MB concentration range 20鈥?50 mg/L. The adsorption kinetics follows the pseudo-second-order model. Furthermore, the dye saturated microspheres can be easily recycled by an external magnetic field and regenerated using 1鈥? wt % NaOH aqueous solution. After six recycle runs, 98% of the adsorption capacity was still retained. The low-cost magnetic hollow spheres with good adsorption capacity are a promising candidate for water treatment.