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《Environmental Science & Technology》 2011-12
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Surface Modification of Activated Carbon and Its Adsorption for Phosphate

LI Shan,LI Jing-zhe(School of Environmental Science and Engineering,Chang’an University,Xi’an 710054,China)  
Six modified powder activated carbon(PAC) were prepared by chemical immersion method using nitric acid,sodium hydrate,ferric trichloride and sodium alginate as modifiers,and their adsorption for phosphates were studied.Results showed that the adsorption capacity of activated carbon which modified with ferric trichloride or modified with both sodium hydrate and ferric trichloride(referred to as PAC-3and PAC-6) were the highest.At room temperature,25 mL phosphate solution of 30 mg/L and pH 5.0 was treated with 0.4 g PAC-3 for 90 min,the adsorption rate could reach 99%.After the adsorption,PAC-3 could regenerate by elution with 0.1 mol/L sodium hydrate.Effect of coexist substance on phosphate adsorption was also studied.It was found that sodium carbonate and C(r Ⅵ) were beneficial to phosphate adsorption,and C(r Ⅵ) indicated significant effect,while sodium nitrate had no effect and sodium sulfate had little inhibiting effect on phosphate adsorption.Adsorption mechanism was the combination of electrostatic force and complexation,also to exist ion exchange,but its main mechanism was complexation.
【CateGory Index】: X703.1
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