{"title":"NiO-CeO2 Nano-Catalyst for the Removal of Priority Organic Pollutants from Wastewater through Catalytic Wet Air Oxidation at Mild Conditions ","authors":"Anushree, Chhaya Sharma, Satish Kumar","volume":114,"journal":"International Journal of Environmental and Ecological Engineering","pagesStart":644,"pagesEnd":650,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10004605","abstract":"
Catalytic wet air oxidation (CWAO) is normally carried out at elevated temperature and pressure. This work investigates the potential of NiO-CeO2 <\/sub>nano-catalyst in CWAO of paper industry wastewater under milder operating conditions of 90 °C and 1 atm. The NiO-CeO2 <\/sub>nano-catalysts were synthesized by a simple co-precipitation method and characterized by X-ray diffraction (XRD), before and after use, in order to study any crystallographic change during experiment. The extent of metal-leaching from the catalyst was determined using the inductively coupled plasma optical emission spectrometry (ICP-OES). The catalytic activity of nano-catalysts was studied in terms of total organic carbon (TOC), adsorbable organic halides (AOX) and chlorophenolics (CHPs) removal. Interestingly, mixed oxide catalysts exhibited higher activity than the corresponding single-metal oxides. The maximum removal efficiency was achieved with Ce40<\/sub>Ni60<\/sub> catalyst. The results indicate that the CWAO process is efficient in removing the priority organic pollutants from wastewater, as it exhibited up to 59% TOC, 55% AOX, and 54 % CHPs removal.<\/p>\r\n","references":"[1]\tM. Hartmann, S. Kullmann, and H. Keller, \u201cWastewater treatment with heterogeneous Fenton-type catalysts based on porous materials,\u201d J. Mater. Chem., vol. 20, pp. 9002-9017, 2010.\r\n[2]\tP. Saranya, K. Ramani, and G. Sekaran, \u201cBiocatalytic approach on the treatment of edible oil refinery wastewater,\u201d RSC Adv., vol. 4, pp. 10680-10692, 2014.\r\n[3]\tC. S. D. Rodrigues, L. M. Madeira, and Rui A. R. Boaventura, \u201cDecontamination of an industrial cotton dyeing wastewater by chemical and biological processes,\u201d Ind. Eng. Chem. Res., vol. 53, pp. 2412-2421, 2014.\r\n[4]\tC. Wang, A. Yediler, D. Lienert, Z. Wang, and A. 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