[Active carbon from Thalia dealbata residues: its preparation and adsorption performance to crystal violet].
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 x g(-1), micropore area was 426.99 m2 x 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 x g(-1), respectively. In addition, the adsorption process was spontaneous and endothermic, and the randomness of crystal violet molecules increased.
College of Environmental Science and Resources, Zhejiang University, Hangzhou 310058, China. chusy@zafu.edu.cn
Shu-Yi
SY
Chu
Min
M
Yang
Ji-Bo
JB
Xiao
Jun
J
Zhang
Yan-Ping
YP
Zhu
Xiang-Jun
XJ
Yan
Guang-Ming
GM
Tian
D000327:Adsorption; D001673:Biodegradation, Environmental; D002606:Charcoal / Q000737:chemistry*; D005840:Gentian Violet / Q000302:isolation & purification*; D032426:Marantaceae / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D014874:Water Pollutants, Chemical; D002606:Charcoal; D005840:Gentian Violet