Adsorption of cadmium (II) ions from aqueous solution by a new low-cost adsorbent--bamboo charcoal.
Batch adsorption experiments were conducted for the adsorption of Cd (II) ions from aqueous solution by bamboo charcoal. The results showed that the adsorption of Cd (II) ions was very fast initially and the equilibrium time was 6h. High pH (>or=8.0) was favorable for the adsorption and removal of Cd (II) ions. Higher initial Cd concentrations led to lower removal percentages but higher adsorption capacity. As the adsorbent dose increased, the removal of Cd increased, while the adsorption capacity decreased. Adsorption kinetics of Cd (II) ions onto bamboo charcoal could be best described by the pseudo-second-order model. The adsorption behavior of Cd (II) ions fitted Langmuir, Temkin and Freundlich isotherms well, but followed Langmuir isotherm most precisely, with a maximum adsorption capacity of 12.08 mg/g. EDS analysis confirmed that Cd (II) was adsorbed onto bamboo charcoal. This study demonstrated that bamboo charcoal could be used for the removal of Cd (II) ions in water treatment.
Wang
Fa Yuan
FY
State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Qinghuayuan, Haidian District, Beijing 100084, China.
Wang
Hui
H
Ma
Jian Wei
JW
D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry* / Q000191:economics; D003365:Costs and Cost Analysis; D031787:Sasa; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000191:economics / Q000379:methods
D012996:Solutions; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002606:Charcoal