Ultrasound-assisted synthesis of adsorbents from groundwater treatment residuals for hexavalent chromium removal from aqueous solutions
| Autor: | Mark Daniel G. de Luna, Mario Jose R. Sumalinog, Renato O. Arazo, Kim Katrina P. Rivera, Chi-Chuan Kan |
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| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Aqueous solution Chemistry Geography Planning and Development Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound Chromium Adsorption Chemisorption Environmental Chemistry Freundlich equation Water treatment Hexavalent chromium Fourier transform infrared spectroscopy 0210 nano-technology 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Groundwater for Sustainable Development. 5:253-260 |
| ISSN: | 2352-801X |
| DOI: | 10.1016/j.gsd.2017.07.004 |
| Popis: | Groundwater treatment residuals are rich in nano-sized metal oxides which have the potential to remove various water contaminants. In this study, hexavalent chromium adsorbents were synthesized from the residuals of a 30,000 m 3 d -1 groundwater treatment plant in Taiwan. The effects of acid type and ratio, acid concentration, ultrasonication time, and heating duration on adsorption capacity were examined. Adsorbents synthesized using dual-acid solutions yielded lower adsorption capacities compared to those which used pure acid solutions. Adsorption capacity decreased with higher ultrasonication time and heating duration. Chromium removal was improved with higher ionic strength and lower pH of the solution. Results showed high correlation between experimental data and the Freundlich isotherm ( R 2 = 0.9607) and the pseudo-second order kinetic model ( R 2 = 0.9740) suggesting that the dominant mechanism in the adsorption process is chemisorption. The involvement of Fe and Mn species during chromium adsorption was confirmed by the results of energy dispersive X-ray spectroscopy and Fourier transform infrared (FTIR) spectroscopy analyses. |
| Databáze: | OpenAIRE |
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