| Autor: |
ZHANG Bao-ping, YANG Fang, MA Zhong-chen, GUO Mei-chen, LIU Yun |
| Jazyk: |
čínština |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
工程科学学报, Vol 39, Iss 10, Pp 1518-1524 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2095-9389 |
| DOI: |
10.13374/j.issn2095-9389.2017.10.009 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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