化工学报2017，Vol.68Issue(5)：1946-1953,8.DOI:10.11949/j.issn.0438-1157.20161453
木质素的化学改性及其对AuCl−4的吸附
Chemical modification of ligninand its adsorption to AuCl?4
摘要
Abstract
The new chemically modified lignin was prepared based on straw by pretreament, phenolation, polycondensation, chloration, amination and quaternarization reaction and was analyzed though FTIR, SEM and TG-DSC. The adsorption effects of the initial concentration of AuCl?4, adsorption time and concentration of hydrochloric acid on AuCl?4 were investigated. Furthermore, the mechanism of adsorption was explored. The results indicated that chemically modified straw lignin was of excellent thermal stability below 217℃ and had plenty of primary amines and hydroxyls. The maximum adsorption capacity was 784.50 mg·g?1 when the initial concentration of AuCl?4 was 8.0 mmol·L?1, the equilibrium adsorption time was 600 min when the initial concentration of AuCl?4 was 1.0 mmol·L?1and the adsorption ratio was 98% when the concentration of hydrochloric acid was 0.5 mol·L?1 and the initial concentration of AuCl?4 was 1.0 mmol·L?1. Equilibrium experiments and kinetics studies fitted well with the Langmuir model and pseudo-second-order model, respectively. Finally, the AuCl?4 was reduced from hydrochloric acid medium in the form of Au(0) by phenolic hydroxyl.关键词
木质素/制备/吸附/AuCl−4/还原Key words
lignin/preparation/adsorption/AuCl−4/reduction分类
矿业与冶金引用本文复制引用
张保平,马钟琛,刘运,郭美辰,杨芳..木质素的化学改性及其对AuCl−4的吸附[J].化工学报,2017,68(5):1946-1953,8.基金项目
冶金及资源利用省部共建教育部重点实验室开放基金项目(FMRU201203) （FMRU201203）
第47批教育部留学回国人员科研启动基金项目. supported by the Open Fund of the Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education (FRMU201203) and the Scientific Research Foundation for the Returned OverseasChineseScholars,StateEducation Ministry(the 47thbatch). （FRMU201203）
