TiO[sub.2]-Powdered Activated Carbon in Water

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO[sub.2]-coated activated carbon (TiO[sub.2]/PAC) has been synthesized using the sol-gel method. A ne...

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Bibliographic Details
Published in:Water (Basel) 2021-06, Vol.13 (12)
Main Authors: Guo, Xiao-Pin, Zang, Peng, Li, Yong-Mei, Bi, Dong-Su
Format: Article
Language:English
Subjects:
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Summary:2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO[sub.2]-coated activated carbon (TiO[sub.2]/PAC) has been synthesized using the sol-gel method. A new TiO[sub.2]/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO[sub.2] had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO[sub.2]/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO[sub.2]/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO[sub.2]/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.
ISSN:2073-4441
2073-4441
DOI:10.3390/w13121622