文献类型：期刊文献

英文题名：Adsorption kinetics and isotherms of Cr(VI) ions in aqueous solution by biochar derived from torreya grandis nutshell

作者：Huang, Chengcai[1]; Qin, Rui[1]; Zhang, Linli[1]; Qiu, Muqing[1]; Bao, Linfa[1]

机构：[1] College of Life Science, Shaoxing University, Shaoxing, 312000, China

年份：2019

卷号：18

期号：4

起止页码：1375

外文期刊名：Nature Environment and Pollution Technology

收录：EI(收录号：20195107853968)、Scopus(收录号：2-s2.0-85076392766)

语种：英文

外文关键词：Adsorption - Complexation - Fourier transform infrared spectroscopy - Heavy metals - High resolution transmission electron microscopy - Ions - Isotherms - Kinetics - Monolayers - Oxygen - Scanning electron microscopy - Specific surface area

外文摘要：Biochar is thought to be a good adsorption material for the adsorption of heavy metals. In this study, biochar derived from Torreya grandis nutshell was prepared through to be pyrolyzed under oxygen limited conditions in a muffle furnace. The adsorption experiments of Cr(VI) were carried out. Through Elemental Analyzer, Specific Surface Area Meter, Scanning Electron Microscopy, Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy, a fundamental understanding of the physical and chemical properties of biochar was gained. The results showed that it was a smooth sheet and irregular arrangement structure. The elements of C, H, O and N of biochar are 45.21%, 5.18%, 46.16% and 3.45% respectively. BET specific surface area of biochar is 42.24 m2/g. A lot of oxygencontaining functional groups (- OH, COO -, - C - OH and so on ) appeared on the surface of biochar. It can be described by the pseudo-second order kinetic rate model and Langmuir isotherm model. The adsorption process is a monolayer chemical process. The adsorption mechanism of biochar on heavy metal Cr(VI) contains the electrostatic attraction between biochar and Cr2O72-, HCrO4- and CrO42- ions in aqueous solution and complexation reaction of oxygen-containing functional groups (- OH, - COOH and so on) and Cr2O72- , HCrO4- and CrO42- ions on the surface of biochar. ? 2019 Technoscience Publications. All rights reserved.