Visible light assisted FeOOH/CeO₂/C deep degradation of organic matter in coking wastewater

In order to degrade hard-to-degrade organic pollutants such as amines, phenols, naphthalenes, pyrroles and pyridazines in coking wastewater, the nano-FeOOH/CeO₂/C composite catalysts (FCHCoke) were prepared. Firstly the catalysts were characterized by XRD, TEM, BET, BJH and UV/Vis/NIR. Then UV-Vis and GC-MS were used to detect the products in the degradation process of organic pollutants, respectively. The results showed that the average pore size of FCHCoke was 2-6 nm and the carrier coke enhanced the ability of the catalyst to absorbs visible light. Each intermittent light exposure for 2 h showed a better photodegradation. Under the intermittent irradiation of visible light of for a total of 8 h, 100µg۰mL^-1aniline and phenol were completely degraded. Dihydronaphthalene, esters, pyrrole, pyridazine, oxime and macromolecular alkanes in coking wastewater were also completely degraded. The acidity of pH=6 is more suitable for the photodegradation reaction of the catalyst. Organic degradation is the result of a combination of chemical catalysis and photocatalysis.