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Molecules 2016, 21(4), 405;

Insolubilization of Chestnut Shell Pigment for Cu(II) Adsorption from Water

Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China
Faculty of Science, Southwest Forestry University, Kunming 650224, China
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 20 January 2016 / Revised: 4 March 2016 / Accepted: 22 March 2016 / Published: 28 March 2016
(This article belongs to the Section Green Chemistry)
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Chestnut shell pigment (CSP) is melanin from an agricultural waste. It has potential as an adsorbent for wastewater treatment but cannot be used in its original state because of its solubility in water. We developed a new method to convert CSP to insolubilized chestnut shell pigment (ICSP) by heating, and the Cu(II) adsorption performance of ICSP was evaluated. The conversion was characterized, and the thermal treatment caused dehydration and loss of carboxyl groups and aliphatic structures in CSP. The kinetic adsorption behavior obeyed the pseudo-second-order rate law, and the equilibrium adsorption data were well described with both the Langmuir and the Freundlich isotherms. ICSP can be used as a renewable, readily-available, easily-producible, environmentally-friendly, inexpensive and effective adsorbent to remove heavy-metal from aquatic environments. View Full-Text
Keywords: Castanea; heating; heavy metal; melanin; removal Castanea; heating; heavy metal; melanin; removal

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yao, Z.-Y.; Qi, J.-H.; Hu, Y.; Wang, Y. Insolubilization of Chestnut Shell Pigment for Cu(II) Adsorption from Water. Molecules 2016, 21, 405.

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