摘要
以稻草为原料,经酚化、交联和胺化后合成了季铵型木质素,并研究了其对AuCl4-的吸附性能.通过傅里叶红外光谱(FT-IR)、扫描电镜(SEM)和差热-热重分析(TG-DSC)对合成产物进行了表征,考察了AuCl4-初始浓度、盐酸浓度和吸附时间对AuCl4-吸附效果的影响.研究结果表明,合成的产物为热稳定性好且含有大量孔隙和表面粗糙的不规则块状季铵型木质素;在盐酸浓度为0.5 mol·L-1,AuCl4-初始浓度为6.0 mmol·L-1,吸附100 h时AuCl4-的最大吸附容量为3.27 mol·kg-1,在0.5 mol·L-1盐酸和1.0 mmol·L-1AuCl4-的条件下吸附达到平衡时间为360 min.经扫描电镜和X射线衍射分析和傅里叶红外光谱分析表明吸附后的AuCl4-被季铵型木质素中的酚羟基还原而以单质形态析出.
Quaternary ammonium lignin was synthesized from rice straw after phenolization,crosslinking and amination. Its adsorption properties for AuCl4^- were investigated. The adsorbent was characterized by Fourier transform infrared spectroscopy（FT-IR）,scanning electron microscope（SEM）,thermogravimetric analysis and differential scanning calorimetry（TG-DSC）. The effects of initial concentration of AuCl4^-,concentration of hydrochloric acid and adsorption time on the effect of adsorption for AuCl4^- were discussed. The results show that the quaternary ammonium lignin has excellent thermal stability and its surface is irregularly rough and porous. The maximum adsorption capacity is 3. 27 mol·kg^-1 when the concentration of hydrochloric acid is 0. 5 mol·L^-1,the initial concentration of AuCl4^- is 6. 0 mmol·L^-1 and the adsorption time is 100 h. The equilibrium time of adsorption for AuCl4^- is 360 min when the concentration of AuCl4^- is 1 mmol·L^-1,the concentration of hydrochloric acid is 0. 5 mol·L^-1. Moreover,AuCl4^- was reduced to elemental gold by the phenolic hydroxyl group of the quaternary ammonium lignin through the analyses of XRD,SEM and FT-IR.
出处
《工程科学学报》
EI
CSCD
北大核心
2017年第10期1518-1524,共7页
Chinese Journal of Engineering
基金
教育部第47批留学回国人员科研启动基金资助项目(FMRU201203)
关键词
稻草
季铵型木质素
合成
AuCl4^-
吸附性能
rice straw
quaternary ammonium lignin
synthesis
AuCl4^-
adsorption properties
