The adsorption of dye waste using black carbon from polyethylene terephthalate (PET) plastic bottle waste

Black carbon from PET plastic bottles has been successfully synthesized by heating methods. Six gram sample of PET plastic bottle were heated by furnace for 2 hours with various heating temperature as 300°C, 350°C, 400°C, and 450°C. Black carbon then mixed with methylene blue in aqueous solution with various masses as 20 mg, 40 mg, 60 mg, 80 mg, and 100 mg. This study shows that the black carbon which synthesized at temperature of 450°C performs as the most effective absorbent. The solution of methylene blue changed its color significantly and became clearer after the adsorption process. The absorbance spectra of methylene blue lies at the wavelength of 550-700 nm and decreasing the absorbance intensity. It indicates that the concentration of methylene blue is decreased during adsorption proccess which predicted due to the oxygen molecul and the porosity. The analysis of carbon morphology showed that black carbon which synthesized at temperature of 450°C has more pores, while the black carbon which heated at temperature of 400°C has few pores. The EDX analysis shows that black carbon that heated at temperature of 450°C contains 32,4% oxygen, whereas black carbon that heated at temperature of 400°C contains 24,3% oxygen.