HETEROGENEOUS PHOTO-FENTON AND PHOTOCATALYTIC DEGRADATION STUDIES OF 2-CHLORO-4-NITROPHENOL (2CL4NP) USING FOUNDRY SAND AND TIO2 COATED CEMENT/CLAY BEADS

摘要

Cement and clay beads coated with TiO 2 were used for the photo-degradation and mineralization of 2-chloro-4-nitrophenol (2Cl4NP) along with a heterogeneous solar photo-Fenton process using foundry sand (FS) as the iron source. The degradation process was optimized using slurry photocatalysis where 96% degradation of 2Cl4NP was achieved in 120 min at optimized conditions of C0=50 mgL(-1), pH=4, 0.75 gL(-1) TiO2 and H2O2 =0.1 mL/200 mL. Degradation of 2Cl4NP was analyzed through HPLC along with UV-Visible spectrophotometer at 266 nm. The degradation of 68% and 52% of 2Cl4NP was attained in fixed-bed photocatalysis using cement and clay beads, respectively. The durability studies of cement and clay beads were carried out in terms of number of recycles. 97.19% degradation was obtained in a solar photo-Fenton process after 105 min at pH=3. Complete mineralization of 2Cl4NP was confirmed through reduction in COD along with the disappearance of the parent compound peak in HPLC chromatograms.