Adsorption Removal Of Methylene Blue From Aqueous Solution By Using Bamboo Charcoal

摘要

The adsorption removal of methylene blue from water by bamboo charcoal was studied in a batch adsorption system. Experiments were carried out as function of contact time, temperature, adsorbent dose and particle size, initial adsorbate concentration, and solution pH. The dynamical data fit well with the pseudo-second-order kinetic model (R~2>0.9968), which was indicated with the apparent activation energy of 27.634 kJ/mol. The Langmuir model agrees very well with the experimental data (R~2>0.9995). On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 58.48 mg/g at 30 ℃, 64.10 mg/g at 40 ℃ and 69.93 mg/g at 50 ℃. The negative values of Gibbs free energy (-12.382 - -15.625 kJ/ mol) indicate the spontaneous nature of the adsorption. It is suggested that the adsorption is likely to be at the state between physical and chemical adsorption.