Equilibrium and kinetic study of adsorption of diazinon from aqueous solutions by nano-polypropylene-titanium dioxide: Optimization of adsorption based on response surface methodology (RSM) and central composite design (CCD)

다국어 초록 (Multilingual Abstract)

This study evaluated the applicability of the adsorption of a widely used organophosphorous pesticide named diazinon, from aqueous using a new composite consisting of nan-TiO2 and polypropylene (Nano-PP/TiO2). The Nano-PP/TiO2 was prepared by wet heat with submerging in an ultrasonic chamber. Extraction and analysis of diazinon were accomplished with dispersive liquid-liquid-microextraction and gas chromatography. By using FTIR, SEM, TEM, and BET technologies, specifications of Nano-PP/TiO2 structure were determined. Adsorption equilibrium and kinetics of diazinon were investigated in a batch reactor and the effects of adsorbent dose, contact time, and initial concentrations of diazinon were assessed. It was found that the two-parameter models arranged the data better than the three-parameter, and the equilibrium data was represented properly by the Langmuir. Additionally, it was identified that adsorption followed the pseudo-second-order kinetic model. To optimize the conditions for maximum adsorption of diazinon, response surface methodology was implemented the effects of factors on the adsorption efficiency were surveyed. The values of optimal initial diazinon concentration, contact time, and mass of Nano-PP/TiO2 were obtained at 10mg L1, 32.2min, and 2.25 g L1, respectively. Based on the results, the Nano-PP/TiO2 can be used as an effective and efficient adsorbent for the removal of diazinon from aqueous.

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