Microwave photocatalysis II: novel continuous‐flow microwave photocatalytic experimental set‐up with titania‐coated mercury electrodeless discharge lamps

Abstract

BACKGROUND: A continuous-flow microwave photocatalytic reactor was set up consisting of a glass tube equipped with microwave powered mercury electrodeless discharge lamps (EDLs) coated with thin films of nanoporous titanium(IV) oxide. The effect of operational parameters on photocatalytic degradation of aqueous mono-chloroacetic acid (MCAA) by a TiO 2 /UV/MW process was investigated.

Microwave photocatalysis IV: Effects of additional operational parameters on the microwave photocatalytic degradation of mono‐chloroacetic acid using titania‐coated mercury electrodeless discharge lamps

“…This paper represents the continuation of previous studies devoted to the investigation of the operational parameter effects in the MCAA photocatalytic reaction in a batch type reactor using titania thin films as a photocatalyst. The aim of the present work was to examine the influence of additional operational parameters (i.e.…”

“…As reported, titanium dioxide precursor was prepared by means of the sol–gel method in the reverse micelles of a non‐ionic surfactant, Triton X‐100, in cyclohexane. The TiO 2 gels were obtained by hydrolysis of titanium tetraisopropoxide based upon the method of Kluson et al .…”

“…In previous work, the effects of initial pH value, light intensity, H 2 O 2 dosage, and gas bubbling on the photodegradation of mono‐chloroacetic acid (MCAA) over nanoporous titania thin films were studied in detail in a batch type MW reactor. We also reported a new approach for the MCAA degradation in a continuous‐flow MW photocatalytic reactor, together with examination of parameters such as flow rate, reaction temperature, number of EDLs, and air bubbling. Additionally, within the scope of our study, we explored the effect of transition metal‐doped titania thin films on the photocatalytic degradation of MCAA and Rhodamine B .…”

Microwave-Enhanced Photolysis of Norfloxacin: Kinetics, Matrix Effects, and Degradation Pathways

“…Microwave (MW)-enhanced TiO 2 photocatalysis using MW-discharged electrodeless lamps (MDELs) as the light source has attracted increasing attention for improving the degradation efficiency of various organic pollutants in aqueous and atmospheric environments [ 26 , 27 , 28 , 29 , 30 , 31 ]. Studies have demonstrated that the irradiation of MW on TiO 2 could form hot spots in the photocatalysts, which could increase the surface defects on TiO 2 and improve the production of additional charge carriers and trap sites to enhance the photocatalytic degradation rate of pollutant [ 32 , 33 ].…”

Microwave photocatalysis III. Transition metal ion‐doped TiO2thin films on mercury electrodeless discharge lamps: preparation, characterization and their effect on the photocatalytic degradation of mono‐chloroacetic acid and Rhodamine B

“…We previously reported18, 19 the effect of operational parameters (number of coating cycles for EDL, number of titania‐coated EDLs, light intensity, initial pH value, H 2 O 2 dosage, flow rate, reaction temperature, and air bubbling) on the photocatalytic degradation of mono‐chloroacetic acid (MCAA) to HCl, CO 2 , and H 2 O, on thin titania‐coated EDLs in a batch MW photocatalytic reactor and in a continuous‐flow MW reactor. In the present research a number of transition metal ion M n+ (M = Fe, Co, Ni, V, Cr, Mn, Zr, Ag) doped titania thin films were prepared by the sol–gel method using titanium n ‐butoxide, acetylacetone, and transition metal acetylacetonate.…”