陈慕涵, 叶群, 蒋绍松, 邵敏, 金次, 黄章杰. 季铵功能化的碳纳米管吸附碱性氰化液中钯[J]. 云南大学学报(自然科学版), 2019, 41(2): 343-350. doi: 10.7540/j.ynu.20180672
引用本文: 陈慕涵, 叶群, 蒋绍松, 邵敏, 金次, 黄章杰. 季铵功能化的碳纳米管吸附碱性氰化液中钯[J]. 云南大学学报(自然科学版), 2019, 41(2): 343-350. doi: 10.7540/j.ynu.20180672
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CHEN Mu-han, YE Qun, JIANG Shao-song, SHAO Min, JIN Ci, HUANG Zhang-jie. Adsorption of palladium using quaternary-ammonium-functionalized carbon nanotube in alkaline cyanide solution[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(2): 343-350. DOI: 10.7540/j.ynu.20180672
Citation: CHEN Mu-han, YE Qun, JIANG Shao-song, SHAO Min, JIN Ci, HUANG Zhang-jie. Adsorption of palladium using quaternary-ammonium-functionalized carbon nanotube in alkaline cyanide solution[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(2): 343-350. DOI: 10.7540/j.ynu.20180672
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季铵功能化的碳纳米管吸附碱性氰化液中钯

Adsorption of palladium using quaternary-ammonium-functionalized carbon nanotube in alkaline cyanide solution

    摘要
  • 摘要: 制备了一种新型碳纳米管−聚苯乙烯甲基季铵盐（ACQ-PS-MWCNT）吸附剂，用于碱性氰化液介质中的Pd（CN）42−的吸附. 采用傅里叶红外光谱（FT-IR），扫描电镜（SEM）和光电子能谱（XPS）对ACQ-PS-MWCNT吸附Pd（CN）42−进行了表征. 静态吸附试验测定最大吸附容量达184.0 mg·g−1，吸附能快速进行，30 min内即达到平衡. 热力学参数测定显示吸附为吸热反应，且能自发进行，实验结果表明ACQ-PS-MWCNT吸附Pd（CN）42−符合Langmuir和二级动力学模型，使用0.2 mol·L−1的NH4SCN溶液洗脱ACQ-PS-MWCNT上吸附的Pd（CN）42−，洗脱率大于98.0%. 5次循环后Pd（CN）42−的回收率大于91.0%. ACQ-PS-MWCNT吸附剂展示了对Pd（CN）42−的快速和高效的吸附能力.

     

    Abstract: In this study, a novel carbon nanotube-polystyrene methyl quaternary ammonium salt (ACQ-PS-MWCNT) was prepared and used as adsorbent for the adsorption of Pd(CN)42− from alkaline cyanide solution. This Study was investigated with scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) measurements. Batch studies were carried out, and the maximum adsorption capacities of Pd(CN)42− reached 184.0 mg·g−1. Adsorption was rapid, and equilibrium was established within 30 min. The thermodynamic parameters reflected the endothermic and spontaneous nature of the adsorption. Moreover, the experimental results indicated that the Langmuir isotherm model fits the palladium adsorption data well and the adsorption was well described by the pseudo-second-order kinetic model. Over 98.0% Pd(CN)42−on the loaded ACQ-PS-MWCNT was eluted using a 0.2 mol·L−1 NH4SCN solution. The recovery rate of Pd(CN)42− was greater than 91.0% after five testing cycles. The ACQ-PS-MWCNT absorbent exhibited a rapid, excellent ability for the adsorption of Pd(CN)42−.

     

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