Adsorption DEHP Using PAN/GO-Fe3O4 Composite Material
Marifatussolihat, Siti Oryza Sativa, Muhammad Yudhistira Azis

Analytical Chemistry Research Division, 3rd Floor Chemistry New Building Department of Chemistry FMIPA ITB

Abstract

DEHP (di-( 2-ethylhexyl) phthalate is a plasticizer that is widely used as an additive added to polymers such as in food and beverage packaging products, beauty, household appliances, as well as medical equipment. DEHP waste in waters can pose a risk of hepatomegaly and tests toxicity. The method that has been used to remove DEHP is the Rotating Biological Contractor but the disadvantage is that the operation and maintenance process is difficult. Adsorption can be an alternative in the removal of DEHP because the process is simple. PAN (polyacrylonitrile) has been widely used to remove organic contaminants in water. Modification by using GO-Fe3O4 can improve the physical properties and chemical stability of PAN. In this study the composite material synthesized from polyacrylonitrile modified GO-Fe3O4 in dimethylformamide solvent has been carried out by the casting method, characterizing it and evaluating the performance parameters of the adsorp si by determining the optimum conditions for adsorption of DEHP. FTIR characterization results obtained dominant peaks at 530-570 cm-1, 2244 cm-1 and 3464-3579 cm-1 indicating the presence of Fe-O bonds, CN groups and OH groups. Surface morphology and cross-section were evaluated using SEM-EDS. The optimum conditions for DEHP adsorption occurred at a contact time of 90 minutes, the mass of the PAN/GO-Fe3O4 material was 0.08 grams, the temperature was 25&deg-C and the initial concentration of the analyte was 300 ppm. The results of the study of adsorption kinetics found that the adsorption process followed a pseudo-first order. The results of the adsorption isotherm study showed that the adsorption process followed the Langmuir isotherm. The adsorption thermodynamic parameters showed that the adsorption process was exothermic with an exothermic entalphy value -63,122 kJ/mol

Keywords: adsorption, adsorption performance, di-(2-etilheksil) ftalat (DEHP), PAN/GO-Fe3O4

Topic: Chemistry