title: Polyethylenimine modified biochar adsorbent for hexavalent chromium removal from the aqueous solution.
abstract: A chemical modified biochar with abundant amino groups for heavy metal removal was prepared using polyethylenimine (PEI) as a modification reagent, and used as an adsorbent for the removal of Cr(VI) from aqueous solution. The biochars before and after modification were characterized by Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy etc. The adsorption of Cr(VI) by the modified biochar was obeyed pseudo-second-order kinetic model and Langmuir adsorption isotherm model. Its maximum adsorption capacity was 435.7 mg/g, which was much higher than that of pristine biochar (23.09 mg/g). Results also indicated that the removal of Cr(VI) by the PEI modified biochar depended on solution pH, and a low pH value was favorable for the Cr(VI) removal. The results herein revealed that the PEI modified biochar had a good potential as a suitable material for sorption and detoxification of Cr(VI) from aqueous solution.
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors: Ying
authors: Y
authors: Ma
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors: Wu-Jun
authors: WJ
authors: Liu
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors: Nan
authors: N
authors: Zhang
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors: Yu-Sheng
authors: YS
authors: Li
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
authors: Hong
authors: H
authors: Jiang
authors: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China. Electronic address: gpsheng@ustc.edu.cn.
authors: Guo-Ping
authors: GP
authors: Sheng
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D011094:Polyethyleneimine / Q000737:chemistry*; D012996:Solutions; D055672:Static Electricity; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; C540010:biochar; D002857:Chromium; D002606:Charcoal; C074702:chromium hexavalent ion; D011094:Polyethyleneimine
keywords: Adsorption; Biochar; Hexavalent chromium; Modification; Polyethylenimine (PEI)