Highly efficient scavenging of Ni(II) by porous hexagonal boron nitride: Kinetics, thermodynamics and mechanism aspects
| Autor: | Wensheng Linghu, Guodong Sheng, Li Li, Shaodong Zhou, Chaogui Chen, Ping Fang, Kaikai Chang, Kui Du, Tasawar Hayat, Xiaojie Guo, Chao Shen |
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| Rok vydání: | 2020 |
| Předmět: |
Inorganic chemistry
Alkalinity General Physics and Astronomy chemistry.chemical_element Sorption 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound Nickel Adsorption X-ray photoelectron spectroscopy chemistry Chemisorption Hydroxide Freundlich equation 0210 nano-technology |
| Zdroj: | Applied Surface Science. 521:146373 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2020.146373 |
| Popis: | Intending to remove Ni(II) from wastewater, porous p-BN was employed to recovery Ni(II) by batch and X-ray photoelectron spectroscopy technique. The performances and mechanism of p-BN for Ni(II) sorption had been studied by diverse characterization technologies. The kinetic data was calculated to conform a pseudo-second-order model, and isotherm data fitted to a Freundlich equation. We obtained a high removal rate and a high adsorption capacity. A possible mechanism can be expressed from XPS results. The surface of p-BN is B OH/B NH2 enriched and exhibits a weak alkalinity. When p-BN contact with Ni(II) solution, the hydroxide ions releases from the surface while there is a formation of B O⋯Ni; the small group of B O⋯Ni is acting with hydroxide ions, thereby forming B O⋯Ni(OH)2 and continuously adsorbs Ni(II) to form B O⋯Ni(OH)ONi(OH) like as precipitated nucleus. Then, due to the interaction of hydroxyl-O with electron-deficient B, the veil-like Ni(OH)2 generated from precipitated nucleus evenly attaches to p-BN. The bonding state of Ni(II) on p-BN by XPS spectra revealed that the process of adsorbing Ni(II) onto p-BN was chemisorption through the formation of Ni(OH)2 and the interaction between hydroxyl-O and electron-deficient B. The analyses implied that p-BN is a promising candidate for recovery of Ni(II) from wastewater. |
| Databáze: | OpenAIRE |
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