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Nanoscale Res Lett. 2019 Mar 19;14(1):104. doi: 10.1186/s11671-019-2934-x.

Hierarchical Structure Kaolinite Nanospheres with Remarkably Enhanced Adsorption Properties for Methylene Blue.

Author information

1
College of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, 454000, China. qianzh@hpu.edu.cn.
2
College of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, 454000, China. zhangyudebj@163.com.
3
College of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, 454000, China.
4
School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, China.

Abstract

Kaolinite nanospheres with hierarchical structures were synthesized via dehydration-rehydration technique through calcined-hydrothermal route. The microstructure of samples were characterized and analyzed by diverse techniques. The results show that after hydrothermal treatment, the layered pseudo-hexagonal kaolinite particles transformed to hierarchical structure nanospheres. The hierarchical structures exhibit large specific surface area of 157.1 m2 g-1 and narrow mesoporous size distribution. The adsorption properties of kaolinite nanospheres were systematically investigated by the removal of methylene blue (MB) from water. It was found that the nanospheres can rapidly adsorb MB with a higher adsorption capacity (184.9 mg/g), and adsorption data followed Langmuir isotherm model and pseudo-second-order kinetic model. Furthermore, the adsorbent can be regenerated by washing with methanol-HCl solution and shown removal efficiency of more than 95% up to 4 cycles.

KEYWORDS:

Adsorbent; Hydrothermal; Kaolinite; Methylene blue; Microstructure; Nanospheres

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