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Optimization of Advanced Oxidation Process Based on Persulfate (Uv/Na2s2o8/Fe2+) for Phthalic Acid Removal From Aqueous Solutions With Response Surface Methodology



Yegane Badi M1 ; Fallah Jokandan S1 ; Esrafili A1 ; Yousefzadeh S2 ; Ahmadi E3 ; Azari A4 ; Mokhtari SA5 ; Rezaei Nia S1 ; Gholami M1
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, Faculty of Public Health, Iran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Environmental Health Engineering, Aradan Faculty of Public Health and Paramedical, Semnan University of Medical Sciences, Semnan, Iran
  3. 3. Department of Environmental Health Engineering, Faculty of Public Health, Kashan University of Medical Sciences, Kashan, Iran
  4. 4. Department of Environmental Health Engineering, Faculty of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Environmental Health Engineering, Faculty of Environmental Health, Ardabil University of Medical Sciences, Ardabil, Iran

Source: Journal of Babol University of Medical Sciences Published:2018

Abstract

BACKGROUND AND OBJECTIVE: Phthalic acid has high toxicity and low degradability which has put treatment of wastewater containing this compound prior to prevent its health and environmental hazards. Present study was conducted to Optimization of (UV/Na2S2O8/Fe2+) process for phthalic acid removal from aqueous solutions with response surface methodology. METHODS: This is an experimental study which was conducted at laboratory scale and synthetically in the cylindrical reactor containing UV-C lamp with 16 Watt power. Effects of variables including pH of solution (3-11), reaction time (0-60 min), concentration of persulfate (0.1-0.5 mmol/L), concentration of Fe2+ (0.1-0.2 mmol/L) and initial phthalaic acid (5-50 mg/L) on efficacy of process were investigated by response surface method (box Behnken method). The residual concentration of phthalic acid was measured by HPLC at a wavelength of 254 nm FINDINGS: The removal efficiency of phthalic acid increased by increasing pH level and reaction time. The maximum removal efficiency of phthalic acid attained as 98 percent at pH of 11, reaction time of 60 min, 0.15 mmol/L of Fe2+ concentration, persulfate concentration of 0.3 mmol/L and 5 mg of phthalic acid. The process of removing phthalic acid followed from first-order kinetic (R2=0.9766). The effects of all studied independent variables with p<0.05 on removal efficiency of phthalic acid were found significant. CONCLUSION: Obtained results indicated that the UV/Na2S2O8/Fe2+ process for removing phthalic acid from the aquatic environments has high efficiency. This issue confirms the acceptable efficiency of mentioned method for the removal of phthalic acid. © 2018, Babol University of Medical Sciences. All rights reserved.
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