Removal of microcystin-LR from drinking water using a bamboo-based charcoal adsorbent modified with chitosan
Hangjun Zhang
,
Guoying Zhu
,
Xiuying Jia
,
Ying Ding
,
Mi Zhang
,
Qing Gao
,
Ciming Hu
,
Shuying Xu
DOI:10.1016/S1001-0742(10)60676-6
Received November 05, 2010,Revised September 23, 2011, Accepted , Available online December 07, 2011
Volume 23,2011,Pages 1983-1988
A new kind of low-cost syntactic adsorbent from bamboo charcoal and chitosan was developed for the removal of microcystin-LR from drinking water. Removal efficiency was higher for the syntactic adsorbent when the amount of bamboo charcoal was increased. The optimum dose ratio of bamboo charcoal to chitosan was 6:4, and the optimum amount was 15 mg/L; equilibrium time was 6 hr. The adsorption isotherm was non-linear and could be simulated by the Freundlich model (R2 = 0.9337). Adsorption efficiency was strongly affected by pH and natural organic matter (NOM). Removal efficiency was 16% higher at pH 3 than at pH 9. Efficiency rate was reduced by 15% with 25 mg/L NOM (UV254 = 0.089 cm-1) in drinking water. This study demonstrated that the bamboo charcoal modified with chitosan can effectively remove microcystin-LR from drinking water.
