Isotherm and Kinetic Study on the Adsorption of Penicillin G from Aqueous Solution by Using Modified Canola

Antibiotics are one of the important sources of environmental pollution in recent years and are harmful for human health and environment. Therefore, the purpose of this research was investigating removal of penicillin G from aquatic solution by activated canola.
This study was an experimental-laboratory research and performed at batch system. The effect of various parameters including contact time, pH, concentration of Penicillin G and dose of adsorbent was investigated. The adsorption data was explained by adsorption isotherms and kenitics. The penicillin concentration was determined by spectrophotometer in wavelength of 515 nm using hydroxylamine method. All experiments were repeated thrice and data were interpreted and analyzed through SPSS 18 software.
The results showed that pH value of 3, penicillin G concentration 10 mg/L, adsorbent dosage of 5 g/L and contact time of 75 min were determined as the optimum conditions. The penicillin G removal efficiency of 99.1% was obtained in the optimum conditions. The equilibrium data is best fitted on Langmuir isotherm and Pseudo second order kinetic. The maximum adsorption capacity for Langmuir model was calculated to be 11.4 mg/g.
The result of the present work shows that Canola can be used as an effective and low-cost adsorbent for removing penicillin G from aqueous solution.