Preparation of Acid-Treated Sunflower Straw Powder and Adsorption Behavior of Cr(VI) Ions onto it

Li Ping Chen; Yi Wen Duan; Da Lai Si Qin

doi:10.4028/www.scientific.net/AMR.550-553.2361

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Preparation of Acid-Treated Sunflower Straw Powder and Adsorption Behavior of Cr(VI) Ions onto it

Abstract:

The adsorption of Cr⁶⁺ ions by sulfuric acid -treated sunflower straw powder was investigated under batch mode. The influence of solution pH, adsorbent dosage, adsorbent particle size and temperature was studied. The results have shown that the absorbent was efficient, the removal ratio of Cr⁶⁺ up to 99.5% with an adsorbent dosage of 8 g•L^-1, a pH of 6.0, at 25°C and particle size in 80-100 mesh. The negative changes in free energy (△G) indicate that the adsorption is a spontaneous process, the positive values of the adsorption entropy △S indicate the increased randomness of the Cr⁶⁺ on straw active carbon surface than in solution.