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Title: Catalytic activities of ultra-small β-FeOOH nanorods in ozonation of 4-chlorophenol
Authors: Oputu, Ogheneochuko 
Chowdhury, Mahabubur R. 
Nyamayaro, Kudzanai 
Fatoki, Olalekan S 
Fester, Veruscha G 
Keywords: Ultra-small β-FeOOH;nanorods in ozonation;4-chlorophenol;FTIR spectra;COD removal efficiency
Issue Date: 2015
Publisher: Elsevier
Source: Oputu, O., Chowdhury, M., Nyamayaro, K. et al. 2015. Catalytic activities of ultra-small β-FeOOH nanorods in ozonation of 4-chlorophenol. Journal of Environmental Sciences, 35: 83-90. []
Journal: Journal of Environmental Sciences 
Abstract: We report the catalytic properties of ultra-small β-FeOOH nanorods in ozonation of 4-chlorophenol (4-CP). XRD, TEM, EDS, SAED, FTIR and BET were used to characterize the prepared material. Interaction between O3 and β-FeOOH was evident from the FTIR spectra. The removal efficiency of 4-CP was significantly enhanced in the presence of β-FeOOH compared to ozone alone. Removal efficiency of 99% and 67% was achieved after 40 min in the presence of combined ozone and catalyst and ozone only, respectively. Increasing catalyst load increased COD removal efficiency. Maximum COD removal of 97% was achieved using a catalyst load of 0.1 g/100 mL of 4-CP solution. Initial 4-CP concentration Heterogeneous–homogeneous was not found to be rate limiting below 2 × 10 mol/L. The catalytic properties of the catalysis Catalytic ozonation Waste water treatment material during ozonation process were found to be pronounced at lower initial pH of 3.5. Two stage first order kinetics was applied to describe the kinetic behavior of the nanorods at low pH. The first stage of catalytic ozonation was attributed to the heterogeneous surface breakdown of O3 by β-FeOOH, while the second stage was attributed to homogeneous catalysis initiated by reductive dissolution of β-FeOOH at low pH.
ISSN: 1001-0742
Appears in Collections:Appsc - Journal Articles (DHET subsidised)

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