The combination of adsorption from solution and heterogeneous photocatalysis has been tested as a promising technology for the removal of organic water pollutants. A laboratory study was conducted under different conditions using an organophilized clay mineral (HDPM) as adsorbent, Degussa P25 TiO2 as photocatalyst and 2-chlorophenol (2-CP) as a toxic organic pollutant. Three different oxidation processes were compared through the degradation of 2-CP: direct photolysis, UV/TiO2 and HDPM/UV/TiO 2. Both the degradation of 2-CP and the formation of intermediates were total organic and inorganic chloride content were measured to monitor the mineralization process, while X-ray diffraction and thermoanalytical measurements were done to characterize the hydrophobic clay adsorbent. The UV/TiO2 and HDPM/UV/TiO2 system appeared to be equally efficient, while the direct photolysis was far less efficient in the oxidative destruction of 2-CP. The HDPM proved to be a good adsorbent able to adsorb toxic organics from water. It has been demonstrated that in the presence of the adsorbent (in a relatively high concentration) did not result in a decreased mineralization rate of 2-CP. Our results confirm that the adsorbent did not undergo significant changes during the mineralization process, thus the reuse of the adsorbent can be achieved without any regeneration process. The formation of byproducts was observed only in a relatively low concentration. The investigated combined system may perform very well in accumulating, removing and oxidizing efficiently and economically organic water contaminants, being attentive to the growing environmental demands.
|Translated title of the contribution||TiO2-based photocatalytic degradation of 2-chlorophenol adsorbed on hydrophobic clay|
|Number of pages||7|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Nov 1 2002|
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