Preparation and Adsorption Performance of Porous Spherical Silica

doi:10.11901/1005.3093.2015.459

Chinese Journal of Materials Research

2017, Vol. 31

Issue (4): 309-313 DOI: 10.11901/1005.3093.2015.459

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Preparation and Adsorption Performance of Porous Spherical Silica

Jianhui HUANG^1,^2,³(

), Wenting LIN^1,³, Liyan XIE^1,^2,³

1 College of Environmental & Biological Technology, Putian University, Putian 351100, China
2 State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou 350002, China
3 Fujian Provincial Key Laboratory of Ecology-toxicological Effects & Control for Emerging Contaminants, Putian 351100, China

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Jianhui HUANG, Wenting LIN, Liyan XIE. Preparation and Adsorption Performance of Porous Spherical Silica. Chinese Journal of Materials Research, 2017, 31(4): 309-313.

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Abstract

The silica nanospheres were prepared by hydrolysis-condensation reaction of TEOS in isopropanol aqueous solution. Then the silica nanospheres were etched by sodium hydroxide under the protection of polyvinylpyrrolidone. The morphology and specific surface area of the synthetic silica nanospheres were tested by TEM and BET Nitrogen adsorption method, respectively. The model wastewater containing lead ion was used to investigate the adsorption properties and influencing factors of the prepared samples. The results show that the prepared silica have monodipersed porous spherical morphology with the specific surface area of larger than 600 m²/g, which can remove heavy metals in the wastewater efficiently.

Key words: inorganic non-metallic materials silica spherical nano heavy metal adsorption

Received: 03 August 2016

ZTFLH:	X703.5
	O613.72

Fund: Supported by Natural Science Foundation of Fujian Province (Nos.2015J01057 & 2016J05042) and the Scientific Project of Putian Science and Technology Bureau (Nos.2014S03 & 2016S1001)

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	Liyan XIE

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.459 OR https://www.cjmr.org/EN/Y2017/V31/I4/309

Fig.1 TEM images of the samples (a) before etching, (b) etched 2.5 h and (c) etched 2.75 h

Fig.2 BET N₂ adsorption-desorption isothermal curves of the samples (a) before etching and (b) etched for 2.5 h

Table 1 The etching time and BET

Table 2 Effect of etching time on the adsorption of Pb²⁺

Table 3 Parameters obtained by fitting of Langmuir and Freundlich modle

Table 4 The result of adsorption rate and the diffusion equation fitting

Table 5 Repeated experimental results of adsorption and desorption of porous SiO₂

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