TY - JOUR
T1 - Selective removal of Cr(VI) from aqueous solution by adsorption on mangosteen peel
AU - Huang, Kai
AU - Xiu, Yifan
AU - Zhu, Hongmin
N1 - Funding Information:
Acknowledgments The present work was financially supported by an initiation grant-in-aid for returned Chinese scholars founded by Education Ministry of China, and the fundamental funds R&D of USTB.
PY - 2013/9
Y1 - 2013/9
N2 - 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 Pb2+, Fe3+, Zn2+, Cd2+, and Cr3+ 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.
AB - 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 Pb2+, Fe3+, Zn2+, Cd2+, and Cr3+ 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.
KW - Cr(VI)
KW - Esterification
KW - Mangosteen peel
KW - Polyphenolic acids
KW - Reduction
KW - Selective adsorption
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U2 - 10.1007/s11356-013-1497-0
DO - 10.1007/s11356-013-1497-0
M3 - Article
AN - SCOPUS:84880843560
SN - 0944-1344
VL - 20
SP - 5930
EP - 5938
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 9
ER -