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Environ Sci Pollut Res Int. 2013 Sep;20(9):5930-8. doi: 10.1007/s11356-013-1497-0. Epub 2013 Feb 9.

Selective removal of Cr(VI) from aqueous solution by adsorption on mangosteen peel.

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State Key Laboratory of Advanced Metallurgy, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Rd.30, Haidian District, 100083, Beijing, China.


Mangosteen peel, rich in polyphenolic compounds, was used to prepare the adsorbent exhibiting highly selective adsorption for Cr(VI) over other metal ions such as Pb(2+), Fe(3+), Zn(2+), Cd(2+), and Cr(3+) at the pH values of 1∼4. The chemical modification method proposed by using calcium hydroxide is quite cost-effective and ecofriendly without using any toxic reagents or causing any secondary pollution. The adsorption isotherm results revealed that the adsorption of Cr(VI) on the gel fit well the Langmuir adsorption model, and the maximum adsorption capacity for Cr(VI) at pH levels 1, 2, 3, and 4 was evaluated to be 2.46, 2.44, 1.99, and 2.14 mol/kg, respectively. The adsorption mechanism for Cr(VI) on the saponified gel was verified to follow an esterifiaction reaction coupled with the reduction of Cr(VI) to Cr(III) in which H(+) plays a role of promoter. Thus, modified mangosteen peel gel has the prominent selectivity and low cost for Cr(VI) removal.

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