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.
SO2 which is usually emitted at high temperature is one of the most important air pollutants. It is of great significance to develop high temperature SO2 adsorbent with high efficiency and low cost. In this work, a series of hydrotalcite-like compound-derived CaAlO and CaXAlO(X = Ce, Co) were prepared by coprecipitation and calcination method, and were employed as adsorbents for SO2 adsorption at high temperature (700 °C). The structure and surface properties of these adsorbents were characterized by XRD, Brunauer–Emmett–Teller (BET), Derivative thermogravimetric analysis (DTG) and CO2-TPD (temperature programmed desorption) measurement. Addition of a minor amount of Ce, Co (5 wt%) could significantly increase the number of weak alkalinity sites. CaO in CaCeAlO showed the best SO2 adsorption capacity of 1.34 g/g, which is two times higher than that of CaO in CaAlO (0.58 g/g).
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