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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.
The quaternary ammonium-type lignin was synthesized by phenolics, cross-linking and amination using straw as raw material, and its adsorption properties to AuCl4- were studied. The structure of the product was characterized by Fourier transform infrared spectroscopy (FT-IR) ) And differential thermal analysis-TG (TG-DSC) were used to characterize the synthesized products. The effects of AuCl4-initial concentration, hydrochloric acid concentration and adsorption time on AuCl4- adsorption were investigated. The results show that the synthesized product is thermostable The results showed that when the concentration of hydrochloric acid was 0.5 mol·L-1, the concentration of AuCl4- was 6.0 mmol·L-1, the adsorption of AuCl4- The maximum adsorption capacity was 3.27 mol · kg-1, and the equilibrium time was 360 min under the condition of 0.5 mol·L-1 hydrochloric acid and 1.0 mmol·L-1AuCl4-.The results of scanning electron microscopy and X-ray diffraction analysis and Fourier analysis Infrared spectrum analysis showed that the adsorbed AuCl4- was reduced by the phenolic hydroxyl group in quaternary ammonium lignin and precipitated as elemental species.