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Ruqin Gao ¹, Yiming Gu ¹, Guoting Li ¹, Qian Sun ¹

Affiliations
1 School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, CN

Abstract

Using diatomite as the main material, diatomite-based porous ceramsite was prepared by wet grinding, molding by rolling and high-temperature calcinations. The structure and properties were characterized by X-ray diffraction, Scanning Electron Microscope, Mercury Injection Apparatus and so on. The ultraviolet-visible spectrophotometer was used to analyse the adsorption properties of diatomite-based porous ceramsite on Cu²⁺. The results show that the pore size distribution of materials is 300~3500 nm, the specific surface area is 6.14 m²/g, and the pore porosity is 47.8%. Plenty of unsaturated bonds, such as -OH, Si-O-Si and O-Si-O, cluster on the surface of ceramsite. The removal rate of Cu²⁺ reaches 92.5%.

Keywords

Diatomite-Based Porous, Ceramsite, Adsorption, Copper.

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Ruqin Gao ¹, Yue Geng ², Guoting Li ¹, Yiming Gu ¹, Sun Qian ¹

Affiliations
1 School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, CN
2 School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, IN

Abstract

Taking diatomite as the main material, the DPC was obtained by solid-phase sintering and low-temperature calcination craft. The study focused on the content of tourmaline to influence of materials’ microstructure, pore size distribution and the decolourization ability for malachite green aqueous solution. Samples in different tourmaline content were characterized by scanning electron microscopy, Hg porosimetry and so on. The results indicate that sample with 12% tourmaline has the smallest average aperture of 177.5 nm and biggest specific surface area of 6.83 m2/g; tourmaline content is enhanced from 0% to 16%, the materials’ porosity decreased from 49.3% to 36.5% and materials’ decolourization ability to malachite green solution’s strengthens gradually. When tourmaline content is 16%, malachite-green aqueous solution is completely decolourized in 6h and the absorption peaks disappear at 412 nm and 618 nm.

Keywords

DPC, Tourmaline, Pore Structure, Malachite Green.

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