Application of modified sepiolite as reusable adsorbent for Pd(II) sorption from acidic solutions
| Autor: | Haigang Dong, Hai-yan Wu, Xinxing Liu, Yong Xiao, Jianping Xie, Ningning Feng, Run-hua Wang, Zi-wen Guo, Hao Cui |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Chemistry Sepiolite Metals and Alloys Langmuir adsorption model Sorption 02 engineering and technology 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences symbols.namesake Adsorption X-ray photoelectron spectroscopy 0103 physical sciences Materials Chemistry symbols 0210 nano-technology Chemical adsorption Nuclear chemistry |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 30:1375-1386 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(20)65303-1 |
| Popis: | The adsorption characteristics and mechanisms of modified sepiolite as an adsorbent to recover Pd(II) from acidic solutions were studied. The Pd(II) adsorption properties were analyzed through isotherm, kinetic and thermodynamic models. In addition, SEM−EDS, TEM and XPS were applied to investigating the Pd(II) adsorption mechanisms onto modified sepiolite. The equilibrium data were well fitted to Langmuir isotherm model with maximum Pd(II) adsorption capacity of 322.58 mg/g at 30 °C. The kinetic data could be satisfactorily simulated by the pseudo- second order model, indicating that the rate-controlling step was chemical adsorption. 99% of Pd(II) could be recovered using 1 g/L modified sepiolite when initial concentration of Pd(II) was 100 mg/L. The results of reusability studies indicated the modified sepiolite had an acceptable stability and reusability. This study indicated that the modified sepiolite might be an efficient and cost-effective material for Pd(II) recovery. |
| Databáze: | OpenAIRE |
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