PROTOTIPAGEM DE MICRORREATORES FOTOCATALÍTICOS E TESTES DE FOTODEGRADAÇÃO DE CORANTES ORGÂNICOS

Química Nova

Omar Pandoli¹  Tommaso Del Rosso¹  Vinicius Modolo Santos¹  Renan De Siqueira Rezende¹  Bojan A. Marinkovic¹ 

关键词: microfluidic reactor;    microreactor;    TiO₂;    photodegradation;    water treatment;   

DOI  :  10.5935/0100-4042.20150079

来源: SciELO

【 摘 要 】

A photocatalytic microreactor is defined as a microfluidic device, which is integrated with a photocatalytic coating of TiO₂ deposited on the inner surface of microchannels. This device is capable of degradation of organic dye solution in water in a continuous flow under the action of ultraviolet light. The objectives of this work were to present a rapid and economically viable approach for the prototyping photocatalytic microfluidic devices and to evaluate their photodegradation capability for organic dyes by ultraviolet-visible spectrophotometry. Prototyping of polydimethylsiloxane PDMS/TiO₂/glass microreactors includes several procedures such as mold preparation, microchannel confection on PDMS surface, deposition of TiO₂ on these microchannels, O₂ plasma treatment of PDMS/TiO₂ and glass surface for sealing these two parts. The efficiency of the photocatalytic microreactors was evaluated by fluxing two organic dye solutions, rhodamine B and methylene blue, with different flow rates of between 2 and 4 mL h^-1. When the flow rate at 2 mL h^-1was applied, discoloration of ~ 65% was achieved for both dye solutions, while PDMS/glass microchannels, without TiO₂ film, demonstrated much lower discoloration of between 24 and 42% for rhodamine B and methylene blue, respectively. This confirmed that TiO₂ was successfully deposited onto PDMS microchannels.

【 授权许可】

CC BY-NC   
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