Arsenate adsorption onto iron oxide amended rice husk char
| Autor: | Christopher O. Cope, David A. Sabatini, Damon S. Webster |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Environmental Engineering
Chemistry Environmental engineering Iron oxide Arsenate chemistry.chemical_element Oryza Pollution Husk Ferric Compounds Water Purification chemistry.chemical_compound Adsorption Specific surface area Environmental chemistry medicine Environmental Chemistry Ferric Arsenates Char Waste Management and Disposal Arsenic Water Pollutants Chemical medicine.drug |
| Zdroj: | The Science of the total environment. |
| ISSN: | 1879-1026 |
| Popis: | In this study, rice husks were charred at 550 °C in a partially sealed ceramic vessel for 30 minutes to create a high specific surface area (SSA) rice husk char (RHC). The RHC was then amended with iron oxides using dissolved ferric nitrate, Fe(NO 3 ) 3 ⋅ 9H2O, to provide a surface chemistry conducive to arsenic adsorption. The 550 °C iron oxide amended rice husk char’s (550 IOA-RHC’s) SSA was nearly 2.5 orders of magnitude higher and the arsenate adsorptive level was nearly 2 orders of magnitude higher than those reported for iron oxide amended sand, thus indicating a positive relationship between post-amendment SSA and arsenate adsorptive levels. Rice husks were then charred at temperatures ranging from 450 °C to 1050 °C to create an even higher SSA material, which might further increase arsenate adsorptive levels. The 950 °C RHC was chosen for amendment due to its high SSA and feasibility of being produced in the field. Once amended, the 950 °C iron oxide amended rice husk char (950 IOA-RHC) improved the arsenate adsorption capacity by thus confirming a positive relationship, though not a linear relationship, between post-amendment SSA and arsenic adsorptive capacity. Further study demonstrated that post-amendment mesoporous volume and mesoporous surface area appear to be better indicators of arsenic adsorptive capacity than SSA or iron content. |
| Databáze: | OpenAIRE |
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