Ozonation of Acid Red 14 in the Presence of Inorganic Salts in a Microporous Tube-in-Tube Microchannel Reactor

Abstract

This study was conducted to investigate the effect of inorganic salts on the mass-transfer coefficient of O3 and decolorization of azo dye (Acid Red 14, AR14) solution through ozonation in a microporous tube-in-tube microchannel reactor (MTMCR). The overall volumetric mass-transfer coefficient (K G a) of O3 in the MTMCR was deduced by material balance. The effects of different salts on the K G a of O3 and decolorization efficiency of the AR14 solution were studied, and results show that both were significantly affected by the inorganic salts. Although the K G a of O3 and the decolorization efficiency of AR14 increased with increasing salt concentration and pH, the effect of NaNO3 was much weaker than that of NaCl, Na2SO4, Na2CO3, and NaHCO3. The enhanced K G a of O3 and decolorization could be due to the generation of species with high oxidizing ability in the presence of the salts.

Highly efficient biphasic ozonolysis of alkenes using a high-throughput film-shear flow reactor

“…[16][17][18][19][20] In addition, the mass-transport of ozone into solution benefits from the reactor microfluidics and shear mixing. [21][22][23] Upon exiting the reactor, the reaction mixture self-separates, with the desired products in the organic phase and H 2 O 2 in the aqueous phase.…”

Organic acids enhanced decoloration of azo dye in gas phase surface discharge plasma system

“…As reported, various factors such as gas flow rate, solution pH, inorganic salt content and bubble size could affect the lifetime and mass transfer of gaseous active species in water [11,12]. Methods to reduce bubble size have been widely studied to improve active species mass transfer, such as the ozone microbubble technique [13,14], the foamed wastewater technique [15] and the small cloudy bubble technique [16].…”