Microwave-Assisted Preparation of TiO₂/Activated Carbon Composite Photocatalyst for Removal of Methanol in Humid Air Streams

Abstract

TiO 2 /activated carbon composite photocatalyst was prepared by a microwave-assisted impregnation method and was employed for the removal of methanol from humid air streams. A commercial microwave oven (800 W) was used as the microwave source. Under 2450 MHz microwave irradiation, titanium tetra-isopropoxide (TTIP) was quickly hydrolyzed and anatase TiO 2 was formed in a short time (<20 min). As a result of the volumetric heating and selective heating of the microwave, the solvent and byproducts were quickly removed which reduced energy consumption and processing time. The formed submicrometer TiO 2 particles mainly deposited on the external surface of carbon. In a packed bed reactor with an empty bed contact time of 0.35 s, the prepared materials maintained a 40% removal efficiency at an inlet methanol concentration of 39 ppm. When the TTIP conversion was complete, neither the irradiation time nor the water/TTIP ratio could further change the photocatalytic activity.

Enhanced photoelectrocatalytic degradation of 2,4-dichlorophenoxyacetic acid by CuInS2 nanoparticles deposition onto TiO2 nanotube arrays

“…The photocatalytic degradation of pollutants using titanium dioxide (TiO 2 ) has been extensively studied for environmental protection [1][2][3][4][5], and it is still the most promising photocatalyst because of its exceptional properties such as high efficiency, low cost, chemical inertness, and photostability. However, the widespread technological use of TiO 2 is retarded by its wide band gap (3.0 eV for the rutile and 3.2 eV for the anatase phases), which requires ultraviolet irradiation that accounts for only 4-5% of the spectrum of solar energy for photocatalytic activation.…”

Preparation and characterization of carbon covered TiO2 using sucrose for solar photodegradation

“…Most studies on carbon-doped or covered TiO 2 have been carried out by treating carbon precursors with titania followed by thermal [14,15], microwave heating [16], or reactively cosputtering [17]. However, so far there have been only a few reports to study preparation methods and application of carbon covered TiO 2 by an in situ process using sucrose as carbon source.…”

Synthesis of Novel Nano-Strawberry TiO2 Structures with the Aid of Microwave Inverter System: Growth Time Effect on Optical Absorption Intensity

“…Most important features of microwaveare to polarize the materials of high dielectric constant, and power generation in these materials due to their high dielectric loss, and hence quick and efficient heating is attained [11]. Many researchers have reported synthesis of anatase TiO 2 , which has limited the synthesis time up to 3 hours [12][13]. In this research paper, we report synthesis of anatase TiO 2 nanostructures assisted by 180W micro wave power in 6 minutes.…”