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您的检索式：作者名="Veruscha Fester"
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| 1 | Catalytic activities of ultra-small β-FeOOH nanorods in ozonation of 4-chlorophenol显示文摘We report the catalytic properties of ultra-small β-FeOOH nanorods in ozonation of4-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 m L of 4-CP solution. Initial 4-CP concentration was not found to be rate limiting below 2 × 10-3mol/L. The catalytic properties of the material during ozonation process were found to be pronounced at lower initial p H of 3.5.Two stage first order kinetics was applied to describe the kinetic behavior of the nanorods at low p H. 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 p H. | Ogheneochuko Oputu Mahabubur Chowdhury Kudzanai Nyamayaro Olalekan Fatoki Veruscha Fester | 2015 | Journal of Environmental Sciences2015，27，9： | 3 |
| 2 | Charge transfer between biogenic jarosite derived Fe^3+ and TiO2 enhances visible light photocatalytic activity of TiO2显示文摘In this work, we have shown that mining waste derived Fe^(3+)can be used to enhance the photocatalytic activity of TiO_2. This will allow us to harness a waste product from the mines, and utilize it to enhance TiO_2 photocatalytic waste water treatment efficiency. An organic linker mediated route was utilized to create a composite of TiO_2 and biogenic jarosite. Evidence of Fe\O\Ti bonding in the TiO_2/jarosite composite was apparent from the FTIR, EFTEM, EELS and ELNEFS analysis. The as prepared material showed enhanced photocatalytic activity compared to pristine TiO_2, biogenic jarosite and mechanically mixed sample of jarosite and TiO_2 under both simulated and natural solar irradiation. The prepared material can reduce the electrical energy consumption by 4 times compared to pristine P25 for degradation of organic pollutant in water. The material also showed good recyclability. Results obtained from sedimentation experiments showed that the larger sized jarosite material provided the surface to TiO_2 nanoparticles, which increases the settling rate of the materials. This allowed simple and efficient recovery of the catalyst from the reaction system after completion of photocatalysis. Enhanced photocatalytic activity of the composite material was due to effective charge transfer between TiO_2 and jarosite derived Fe^(3+)as was shown from the EELS and ELNEFS. Generation of OHU was supported by photoluminesence(PL) experiments. | Mahabubur Chowdhury Sipiwe Shoko Fransciuos Cummings Veruscha Fester Tunde Victor Ojumu | 2017 | Journal of Environmental Sciences2017，29，4： | 1 |
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