DEGRADATION OF GAS-PHASE TRICHLOROETHYLENE OVER THIN-FILM TiO2 PHOTOCATALYST IN MULTI-MODULES REACTOR

Sang Bum Kim, Gyung Soo Kim, Sung Chang Hong
2007 Environmental Engineering and Management Journal  
All of the chemicals used in the work were reagent-grade. Acetone was products of Aldrich (A.C.S. reagent, 99.5%). The photocatalyst was prepared from TiO 2 -sol (STS-01, anatase, 7 nm in diameter, 300 m 2 g -1 for specific surface area, Ishihara Sangyo Co.), tetraethyl orthosilicate (TEOS, 98%, Aldrich), dimethoxy dimethyl silane (DMDMS, 95%, Aldrich), isopropyl alcohol (IPA, anhydrous, 99.5%, Aldrich) and nitric acid (65 wt% solution in water, Aldrich). Deionized and doubly distilled water
more » ... used for the preparation of the photocatalyst. The suspension of TiO 2 photocatalyst was prepared through a three-step process as follows; TEOS (180 g) and DMDMS (90 g) were added to the IPA (900 g) on a vessel connected to a condenser at room temperature (1 st step). A solution combined with IPA (900 g), deionized water (45 g) and nitric acid (2.7 g) was dropped in the solution prepared in the first step at a temperature of about 5 for 60 min, and stirred for two hours (2 nd step). STS-01 (3150 g) was then dropped in a solution combined with IPA (1350 g), deionized water (1350 g) and the solution (2025 g) prepared in the second step at a temperature of about 5 for 60 min, and stirred for three hours (3 rd step). A TiO 2 thin film photocatalyst was formed by the dip-coating method. After filling a Pyrex glass reactor with the TiO 2 photocatalyst suspension, it was removed from the reactor at a constant rate of 5 mm min -1 . Then, the reactor coated with TiO 2 was dried at 120 for one hour. Reactor system The multi-modules continuous flow reactor, which nine reactors were arranged in parallel and serial, was designed. A schematic diagram of the experimental set-up is shown in Fig. 1 . It includes three parts: generation of a desired gas mixture containing TCE, photocatalytic continuous reactor, and scrubber containing NaOH solution. A source of main air was supplied from blower (Model Abstract: The present paper examined the photocatalytic degradation (PCD) of gas-phase trichloroethylene (TCE) over thin-film TiO 2 . A large-scale treatment of TCE was carried out using scale-up continuous flow photo-reactor that nine reactors were arranged in parallel and serial. The parallel or serial arrangement is a significant factor to determine the special arrangement of whole reactor module as well as to compact the multi-modules in a continuous flow reactor. The conversion of TCE according to the space time was nearly same for parallel and serial connection of the reactors.
doi:10.30638/eemj.2007.019 fatcat:tksmcmvmefhdfi7vl7ffyxbxze