Adsorption Isotherms of Dimethyl Phthalate (DMP), DiEthyl Phthalate (DEP), Dibutyl Phthlate (DBP) and Benzyl Butyl Phthalate (BBP) Compounds in Synthetic and Sembrong River Sediment

Abstract

Abstract Concentrations of Dimethyl Phthalate (DMP), Diethyl Phthalate (DEP), Dibutyl Phthlate (DBP), and Benzyl Butyl Phthalate (BBP) analysis proved present in Sembrong river sediment. These findings occurred during a certain extent of time depending on the properties of sediment and phthalates esters compound. Therefore, adsorption isotherm conducted using optimization method using manipulating variables of initial concentrations and contact times. The results analysis showed higher percentage adsorption recorded in DMP, DEP, DBP and BBP compounds by synthetic sediment which is 88.3%,89.6%,89.0% and 94.8% whereas river sediment is 87.4%,88.4%, 87.1% and 93.4%. The contributing factors aided in the adsorption of PAEs onto synthetic sediment are higher organic content (OC), smaller particle size having larger surface area and higher molecular weight of PAEs. Competitive adsorption occurred between DMP, DEP and DBP as they are low molecular weight compounds. Adsorption isotherms models by Langmuir and Freundlich isotherms models showed separation factor, RL values are favourable from 0.11 to 0.69. Good statistical fit R2 ranged from 0.97 to 0.99 of a good fit. Therefore, in conclusion, Sembrong river sediment is an adsorbent sediment storage of PAEs compounds.