Synthesis of quaternary ammonium lignin and its adsorption properties on AuCl4-
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摘要: 以稻草為原料,經酚化、交聯和胺化后合成了季銨型木質素,并研究了其對AuCl4-的吸附性能.通過傅里葉紅外光譜(FT-IR)、掃描電鏡(SEM)和差熱-熱重分析(TG-DSC)對合成產物進行了表征,考察了AuCl4-初始濃度、鹽酸濃度和吸附時間對AuCl4-吸附效果的影響.研究結果表明,合成的產物為熱穩定性好且含有大量孔隙和表面粗糙的不規則塊狀季銨型木質素;在鹽酸濃度為0.5 mol·L-1,AuCl4-初始濃度為6.0 mmol·L-1,吸附100 h時AuCl4-的最大吸附容量為3.27 mol·kg-1,在0.5 mol·L-1鹽酸和1.0 mmol·L-1 AuCl4-的條件下吸附達到平衡時間為360 min.經掃描電鏡和X射線衍射分析和傅里葉紅外光譜分析表明吸附后的AuCl4-被季銨型木質素中的酚羥基還原而以單質形態析出.Abstract: 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.
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Key words:
- rice straw /
- quaternary ammonium lignin /
- synthesis /
- AuCl4- /
- adsorption properties
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參考文獻
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