Preparation and Adsorption of in-situ Immobilized Casuarina Bark to Cr (VI)
Tannin and other compounds in Casuarina bark were immobilized in situ by the reaction of the aldehydes and polyphenols. The adsorption behavior of the in-situ immobilized barks to Cr (Ⅵ ) in aqueous solutions was investigated. The results showed that the recovery yields of the modified barks were more than 95％ when the mass ratio of the bark to formaldehyde, glyoxal and glutraldehyde were 1:20, 1:4 and 3:25, respectively. The adsorption capacity of the bark modified with formaldehyde to Cr (Ⅵ) was largest at pH 1.96, and decreased with pH values increase. The equilibrium adsorption capacity of the bark immobilized with fomaldehyde, glyoxal or glutraldehyde was 68.0 mg. g-1, 83.3 mg. g-1 and 82.0 mg. g-1, respectively. The pseudo-second-order rate constant of the barks decreased with the equilibrium adsorption capacity increase.
Shao-ping CHEN Yu-dong LU Zong-hua WU
College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007,China
国际会议
南京
英文
487-491
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）