title: Insolubilization of Chestnut Shell Pigment for Cu(II) Adsorption from Water.
abstract: 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.
authors.affiliation: Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China. z-yyao@hotmail.com.
authors.forename: Zeng-Yu
authors.initials: ZY
authors.lastname: Yao
authors.affiliation: Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China. jhqi1977@163.com.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Qi
authors.affiliation: Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China. huyong760925@163.com.
authors.forename: Yong
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Faculty of Science, Southwest Forestry University, Kunming 650224, China. yingwang_2009@163.com.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry* / Q000633:toxicity; D029785:Cyperaceae / Q000737:chemistry*; D007700:Kinetics; D008543:Melanins / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry* / Q000633:toxicity; D062065:Wastewater / Q000737:chemistry / Q000633:toxicity; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity; D018508:Water Purification
chemical_list: D003300:Copper; D008543:Melanins; D019216:Metals, Heavy; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical
keywords: Castanea; heating; heavy metal; melanin; removal