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| Preparation of Cu2+-Modified Straw Activated Carbon and Its Use for Removal of As（Ⅲ） from Wastewater |
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| KeyWord:As（Ⅲ）; sunflower straw; copper impregnated activated carbon; adsorption; thermodynamics |
| Author Name | Affiliation | | CHEN Li-ping | College of Chemistry and Environment Science, Inner Mongolia Normal University, Hohhot 010022, China | | Siqindalai | College of Chemistry and Environment Science, Inner Mongolia Normal University, Hohhot 010022, China |
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| Abstract: |
| Sunflower straw is agricultural waste. Here we used it to produce Cu2+-modified activated carbon after modification by phosphoric acid and copper employing impregnation method, and then employed the activated carbon to examine adsorption isotherm of As（Ⅲ） in a batch reactor. The effects of reaction time, adsorbent doses, initial concentrations of adsorbent, pH, and temperature on As（Ⅲ） adsorption by the activated carbon were evaluated. The absorbent at 4 g·L-1 was efficient, and removed As（Ⅲ） up to 99.95% at a pH of 12.0 at 30 ℃. The adsorption data fitted reasonably well to the Langmuir isotherm. The maximum adsorption capacity was 64.105 mg·g-1. Positive values of adsorption enthalpy ΔH＞42 kJ·mol-1 indicated that the adsorption process is endothermic and chemical adsorption in nature. Negative changes in free energy（ΔG） showed that the adsorption is a spontaneous process. Positive values of ΔS suggested increased randomness at the solid-solution interface during the adsorption of As（Ⅲ） from aqueous solution by Cu2+-modified activated carbon. |
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