Removal of hexavalent chromium from wastewater by acid-washed zero-valent aluminum
| Autor: | Fenglian Fu, Bing Tang, Zihang Cheng, Weijiang Han |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Scanning electron microscope Inorganic chemistry chemistry.chemical_element Ocean Engineering 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Acid washing chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy Wastewater chemistry Aluminium Humic acid Hexavalent chromium 0210 nano-technology 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Desalination and Water Treatment. 57:5592-5600 |
| ISSN: | 1944-3986 1944-3994 |
| Popis: | This paper deals with the treatment of hexavalent chromium (Cr(VI)) and its removal mechanism using acid-washed zero-valent aluminum (ZVAl). The acid-washed ZVAl before and after reaction was characterized by scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy. The influence factors such as ZVAl loading, acid washing time, and pH values on Cr(VI) removal were studied. Cr(VI) removal by acid-washed ZVAl was also evaluated under different humic acid and Fe2+ concentrations. The removal of Cr(VI) was accelerated with increasing acid-washed ZVAl loadings and decreasing initial pH. The addition of humic acid inhibited the Cr(VI) removal, while Fe2+ significantly accelerated the Cr(VI) removal. More than 98% Cr(VI) was removed from synthetic wastewater containing 20.0 mg/L Cr(VI) in 180 min by 0.4 g/L acid-washed ZVAl at initial pH 2.0. Cr(VI) removal by acid-washed ZVAl is proved by reduction, not by adsorption. The remarkable capacity of acid-washed ZVAl in removing C... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|