Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 388, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2019.112182
Keywords
Photodegradation; Diclofenac; Mp-CN photocatalyst; Visible light; Continuous flow
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Funding
- Elite National Foundation of Iran
- International Postdoc Initiative (IPODI) of the European Union
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In the current paper, the continuous-flow photodegradation of diclofenac (DCF) as an aqueous model pollutant was investigated using porous carbon nitride (mp-CN), immobilized onto stainless steel (SS) plates, as the photocatalyst, and a homemade cubic photoreactor for the degradation reaction. X-ray diffraction (XRD) and N-2 adsorption/desorption characterization (BET) were conducted to determine the structural features of the mp-CN photocatalyst. The effect of operating reaction conditions on DCF photodegradation efficiency, such as the loaded amount of mp-CN photocatalyst (0.8-4.1 mg/cm(2)), initial DCF concentration (10-200 mg/L), and type of irradiation source (LED, solar-simulator, and Xenon lamp), was studied in detail. The highest DCF photodegradation efficiency of about 71% was obtained for a DCF concentration of 10 mg/L, Xenon lamp irradiation, and mp-CN loading of 2.041 mg/cm(2). The kinetic studies indicated a pseudo-first-order reaction that was fitted with the experimental data completely (R-2 > 0.96). The reaction rate constant for the highest DCF degradation efficiency was determined to be k = 0.0049 min(-1)). The stability and reusability experiments proved that the immobilized mp-CN photocatalyst could be used for four times in the continuous-flow mode without a notable decline of the photodegradation performance. The studied photoreactor with the immobilized photocatalyst particles could be an acceptable alternative for photodegradation processes of aqueous contaminants in a continuous-flow mode.
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