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Active carbon from Thalia dealbata residues: Its preparation and  adsorption performance to crystal violet.

CHU Shu-yi1,2, YANG Min2, XIAO Ji-bo2,  ZHANG Jun2, ZHU Yan-ping2,YAN Xiang-jun3, TIAN Guang-ming1   

  1. (1College of Environmental Science and Resources, Zhejiang University, Hangzhou 310058, China;
    2School of Environment and Resource, Zhejiang Agriculture and Forestry University, Lin’an 311300, Zhejiang, China; 3Hangzhou Urban River Supervision Centre, Hangzhou 310008, Zhejiang, China)
  • Online:2013-06-18 Published:2013-06-18

Abstract: By using phosphoric acid as activation agent, active carbon was prepared from Thalia dealbata residues. The BET specific surface area of the active carbon was 1174.13 m2·g-1, micropore area was 426.99 m2·g-1, and average pore diameter was 3.23 nm. An investigation was made on the adsorption performances of the active carbon for crystal violet from aqueous solution under various conditions of pH, initial concentration of crystal violet, contact time, and contact temperature. It was shown that the adsorbed amount of crystal violet was less affected by solution pH, and the adsorption process could be divided into two stages, i.e., fast adsorption and slow adsorption, which followed the pseudosecondorder kinetics model. At the temperature 293, 303, and 313 K, the adsorption process was more accordance with Langmuir isotherm model, and the maximum adsorption capacity was 409.83, 425.53, and 438.59 mg·g-1, respectively. In addition, the adsorption process was spontaneous and endothermic, and the randomness of crystal violet molecules increased.