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Separation Science and Technology Volume 48, 2013 - Issue 17
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Highly Efficient Removal of Congo red from Wastewater by Nano-Cao

Hanmei XiaState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China
,
Lifang ChenState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China
&
Yunjin FangState Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China
Pages 2681-2687 | Received 15 Nov 2011, Accepted 11 May 2013, Published online: 18 Oct 2013
 
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Abstract

Nano-CaO with high surface area of 120 m2 · g−1 has been used as adsorbents for Congo red adsorption from wastewater. The maximum adsorption capability of Congo red on nano-CaO reached 357.14 mg · g−1 in 10 min, while the maximum capability on commercial CaO was only 238.66 mg · g−1 in 30 min. In comparison with commercial CaO, some published metal oxides for Congo red adsorption such as Fe2O3, NiO, MgO, and Mn2O3, etc., the Nano-CaO exhibited much more favorable adsorptive property. In addition, the effects of pH, salt concentration, and temperature were also investigated, and these factors played significant roles for Congo red adsorption on Nano-CaO.

ACKNOWLEDGEMENTS

We are grateful for support from the National Science Foundation of Shanghai (Grant No.10ZR1407200), the National Science Foundation of China (Grant No. 21006029).

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