Paper
Optimization of Pink Guava (Psidium guajava) Waste-based Activated Carbon Preparation Conditions for Methylene Blue Dye Removal
- Authors:
- Norhaslinda Nasuha; Mohamad Syazwan Osman; Rasyidah Alrozi; Nurulhuda Amri
- Abstract
- The optimal conditions for preparation of guava waste based activated carbon (GWAC) for removal of Methylene Blue (MB) dye from aqueous solution were investigated and the performance of GWAC on adsorption capacity were evaluated. The GWAC was prepared using simple thermo-chemical activation method. Central composite design (CCD) was used to determine the optimum preparation conditions for GWAC with response to the GWAC yield and MB percentage removal. Two quadratic models were developed to correlate the preparation variables for both responses. The significant factors on each experimental design response were identified from the analysis of variance (ANOVA). The optimum GWAC preparation conditions were obtained using 550°C activation temperature, 1.93 hour activation time and 1.00 impregnation ratio resulting in 71.71% of GWAC yield and 54.58% of MB removal. From the analysis, activation temperature was found to have the greatest effect on carbon yield. On the other hand, activation temperature and impregnation ratio were found to have significant effects on MB removal. The adsorption performance of GWAC was then conducted using the batch adsorption study to determine the adsorption capacity. The adsorption study was carried out at different initial concentrations of MB (50 – 500 mg/L) at temperature of 30°C for 5 hours. The equilibrium data were analyzed using Langmuir and Freundlich isotherm models followed by kinetics study. The experimental data for GWAC were fitted well with Langmuir isotherm with a maximum monolayer adsorption capacity of 250.00 mg/g. The kinetic study on adsorption of MB obeyed the peudo-second order kinetics with good correlation. The results demonstrated that GWAC is an effective adsorbent for removal of MB and has potential to replace the commercial activated carbon for removal of dyes from wastewater.
- Keywords
- Adsorption Isotherms; Guava Waste Activated Carbon; Methylene Blue; Thermo-chemical Activation
- StartPage
- 32
- EndPage
- 43
- Doi