Highly efficient adsorption of Pb(II) by cubic nanocrystals in aqueous solution: Behavior and mechanism
| Autor: | Guoguang Liu, Tiansheng Chen, Dan Ma, Ping Chen, Haijin Liu, Yalan Wang, Yiping Feng, Ruobai Li, Wenying Lv, Qianxin Zhang, Xuegang Zou, Yuping Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Langmuir
General Chemical Engineering Metal ions in aqueous solution Inorganic chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences lcsh:Chemistry chemistry.chemical_compound symbols.namesake Adsorption Mn-Fe Prussian blue analogue Aqueous solution Ion exchange Chemistry Langmuir adsorption model General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Lead lcsh:QD1-999 Chemisorption symbols K2Mn[Fe(CN)6] nanocrystal Mechanism Ferrocyanide 0210 nano-technology |
| Zdroj: | Arabian Journal of Chemistry, Vol 13, Iss 5, Pp 5229-5240 (2020) |
| ISSN: | 1878-5352 |
| Popis: | As one of the most toxic heavy metal ions, lead pollution has become an urgent problem. Here, a cubic crystal nanoparticle (Prussian blue analogue, PBA), referred to as potassium manganese ferrocyanide (KMFC) was synthesized and used as a highly-effective sorbent for removing Pb(II) from aqueous solution. KMFC is a mesoporous material that has excellent ion exchange properties, which was confirmed by a series of characterizations. This paper investigated the adsorptive attributes of KMFC for lead ions in aqueous solution. The influences of temperature, contact time and pH on adsorption were studied in batch experiments. The KMFC possessed a robust adsorption capacity for resident lead ions in aqueous solution, which attained 1075.27 mg g−1 at room temperature (25 °C), based on the Langmuir model, which was far higher than any previously reported values. The adsorption process was well fitted to a pseudo-second-order kinetic model, as well as Langmuir and Temkin isotherm models, and was endothermic and spontaneous on the basis of thermodynamic analysis. The adsorption of Pb(II) on the surface of KMFC started with electrostatic attraction, due to the electronegativity of KMFC. Further, ion exchange was the dominant mechanism in this adsorption process, which was confirmed by FTIR, XPS, and other supplementary experiments. The good chemisorption (K+ exchange) properties of KMFC suggested that it likely has excellent prospects in applications for heavy metal ions adsorption. This study not only provided a new perspective for the design and development of heavy metal sorbents but provided a deep insight into the mechanism of adsorption of heavy metal ions by PBA. |
| Databáze: | OpenAIRE |
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