Phosphonium-enhanced chitosan for Cr(VI) adsorption in wastewater treatment
| Autor: | Simone C.G. Rodrigues, Sebastian Sessarego, Ye Xiao, Qingye Lu, Josephine M. Hill |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Langmuir
Polymers and Plastics Magnesium Organic Chemistry Phosphonium salt chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chitosan Industrial wastewater treatment chemistry.chemical_compound Adsorption chemistry Desorption Materials Chemistry Phosphonium 0210 nano-technology Nuclear chemistry |
| Zdroj: | Carbohydrate Polymers. 211:249-256 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2019.02.003 |
| Popis: | Adsorption is a commonly used method for industrial wastewater treatment because of its low-cost, easy operation and high efficiency. In this work, chitosan was crosslinked and functionalized with a low-cost phosphonium salt, tetrakis(hydroxymethyl)phosphonium sulfate (THPS), to enhance its adsorption capacity for Cr(VI). The novel phosphonium-crosslinked chitosan (PCC) was characterized using elemental analysis, XRF, FTIR, NMR and SEM-EDX. At pH 6, PCC had a higher Langmuir equilibrium constant than the unmodified chitosan (0.19 ± 0.02 L mg−1 versus 0.0044 ± 0.0005 L mg−1) and PCC demonstrated higher adsorption capacity than chitosan at equilibrium Cr(VI) concentrations below 120 mg L−1. Additionally, magnesium sulfate or magnesium chloride was shown to desorb Cr(VI) and recycle PCC. When treated with THPS, chitosan is activated for Cr(VI) adsorption at pH 6; therefore, PCC can be used in wastewater treatment over a wider pH range than chitosan. |
| Databáze: | OpenAIRE |
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