Adsorption of Anionic Dyes onto Chitosan-modified Diatomite

作者：Zhang Ge-shan; Xue Hong-hai; Tang Xiao-jian; Peng Fei; Kang Chun-li^*

来源：Chemical Research in Chinese Universities, 2011, 27(6): 1035-1040.

• Diatomite
• Chitosan-modified diatomite
• Adsorption
• Reactive Red M-8B
• Direct Green B

The purpose of this work is to study the possibility of anionic dyes Reactive Red M-8B(RR) and Direct Green B(DG) adsorbed on chitosan-modified diatomite. The characteristics of adsorbent, adsorption isotherms and the influence of adsorption time, temperature and pH were researched in this work. The results show that the modified diatomite had a much better adsorption capability than the natural diatomite. The adsorption capacities of chitosan-modified diatomite for RR and DG were 94.46 and 137.0 mg/g, respectively. Both adsorption time and adsorption temperature provided a positive effect on the dye adsorption. Within the experimental pH range, the adsorbance was enhanced at lower pH but reduced sharply at high pH. On the basis of the experimental results and discussion, electrostatic attraction is considered as the main mechanism of this chemisorption.

• 出版日期2011-11
• 单位吉林建筑大学; 吉林大学