Biosorption of aquatic cadmium(II) by unmodified rice straw
| Autor: | Yang Ding, Lianbi Zhou, Debing Jing, Xiaosong Yang, Huili Gong |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Environmental Engineering
chemistry.chemical_element Ultrafiltration Bioengineering Absorption Water Purification Metal Chelation Computer Simulation Waste Management and Disposal Effluent Cadmium Ion exchange Renewable Energy Sustainability and the Environment Chemistry Environmental engineering Biosorption Water Heavy metals Oryza General Medicine Rice straw Plant Components Aerial Models Chemical visual_art visual_art.visual_art_medium Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Bioresource technology. 114 |
| ISSN: | 1873-2976 |
| Popis: | Cadmium is the most common toxic metal threatening safe rice supply. Rice straw has the potential to remove Cd from large-scale effluent contaminated by heavy metals since it exhibited a short biosorption equilibrium time of 5 min, high biosorption capacity (13.9 mg g(-1)) and high removal efficiency at a pH range of 2.0-6.0. The main Cd biosorption mechanism was Cd(2+) ion exchange with K(+), Na(+), Mg(2+) and Ca(2+), together with chelation with functional groups such as C=C, CO, OH and carboxylic acids. When 0.5% (w/v) rice straw was exposed to 50 mg mL(-1) CdSO(4) solution with shaking at 150 r min(-1) for 3h, about 80% of the aquatic Cd was absorbed and the Cd content in rice straw reached 8-10 mg g(-1), suggesting that the metal-enriched rice straw could become high quality bio-ore by virtue of the industrial mining grade of its metal content and easy metal recovery. |
| Databáze: | OpenAIRE |
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