Degradation of microcystin toxins in a falling film photocatalytic reactor with immobilized titanium dioxide catalyst

Shephard, G.S.; Stockenström, Sonja; Villiers, David De; Engelbrecht, W.J.; Wessels, G. F. S.

doi:10.1016/s0043-1354(01)00213-5

Cited by 120 publications

(52 citation statements)

References 24 publications

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“…Consequently the removal of these toxins during water treatment is a key concern. The photocatalytic destruction of cyanotoxins using TiO2, particularly microcystin-LR, has been studied in detail and reported to be a very effective process for removal of these toxins from water [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Pestana

Edwards

Prabhu

et al. 2015

Journal of Hazardous Materials

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Microcystins and nodularin are toxic cyanobacterial secondary metabolites produced by cyanobacteria that pose a threat to human health in drinking water. Conventional water treatment methods often fail to remove these toxins. Advanced oxidation processes such as TiO2 photocatalysis have been shown to effectively degrade these compounds. A particular issue that has limited the widespread application of TiO2 photocatalysis for water treatment has been the separation of the nanoparticulate power from the treated water. A novel catalyst format, TiO2 coated hollow glass spheres (Photospheres™), is far more easily separated from treated water due to its buoyancy. This paper reports the photocatalytic degradation of eleven microcystin variants and nodularin in water using Photospheres™. It was found that the Photospheres™ successfully decomposed all compounds in 5 minutes or less. This was found to be comparable to the rate of degradation observed using a Degussa P25 material, which has been previously reported to be the most efficient TiO2 for photocatalytic degradation of microcystins in water.Furthermore, it was observed that the degree of initial catalyst adsorption of the cyanotoxins depended on the amino acid in the variable positions of the microcystin molecule. The fastest degradation (2 minutes) was observed for the hydrophobic variants (microcystin-LY, -LW, -LF). Suitability of UV-LEDs as an alternative low energy light source was also evaluated.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Pestana

Edwards

Prabhu

et al. 2015

Journal of Hazardous Materials

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“…The supporting electrolytes used in most studies on the electro-oxidation of organic matters are chloride, sulfate, and nitrate salts (Motheo et al 2000;Torres et al, 2003;Fernandes et al, 2004). The photocatalytic degradation of microcystins showed that the use of untreated natural lake water as the water matrix resulted in a slower decomposition of microcystins than distilled water (Shephard et al, 2002). When the cyanobacteria lose activity and die, they will lyse, resulting in the cell-bound MC-LR entering into the water (Figueiredo et al, 2004).…”

Section: Effect Of Electrolyte Typementioning

confidence: 99%

Electrochemical Degradation of Cyanobacterial Toxin Microcystin-LR Using Ti/RuO₂Electrodes in a Continuous Tubular Reactor

Liang¹,

Qu²,

Wang³

et al. 2008

Environmental Engineering Science

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Occurrence of cyanobacteria and their potent toxins has imposed a risk to human health and raised concerns in drinking water treatment. In this study, the applicability of electrochemical oxidation on microcystin-LR produced by cyanobacteria was examined using Ti/RuO 2 as anodes. The experiments focused on the variation and elimination of extracellular and intracellular microcystin-LR during the cyanobacterial inactivation by electrooxidation. The effects of applied current density, cell density, as well as electrolyte type on toxin degradation have been studied. The complete elimination of extracellular and intracellular microcystin-LR was achieved and 100% removal for total microcystin-LR was obtained at current density 5 mA/cm 2 . The results showed that when the cell densities decreased or the applied current densities increased, the efficiency of total microcystin-LR removal could be increased. More than 98% removal for total microcystin-LR was also achieved even if the cyanobacteria were inoculated in lake water or drinking water without adding any chemicals. It can be concluded that electro-oxidation of microcystin-LR is quite an efficient method, and can be applied to remove microcystin-LR from waters during the cyanobacterial inactivation.

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“…Unfortunately, a significant loss in the contact area between the immobilized photocatalyst and a light source limits its efficiency in the photocacalytic degradation of the organic substrates [16][17][18]. Moreover, the life of immobilized TiO 2 catalysts is short because TiO 2 easily fall off from supporting materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of operating parameters on microwave assisted photocatalytic degradation of azo dye X-3B with grain TiO2 catalyst

Zhang

Wang

2005

Journal of Molecular Catalysis A: Chemical

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Degradation of microcystin toxins in a falling film photocatalytic reactor with immobilized titanium dioxide catalyst

Cited by 120 publications

References 24 publications

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Electrochemical Degradation of Cyanobacterial Toxin Microcystin-LR Using Ti/RuO₂Electrodes in a Continuous Tubular Reactor

Effect of operating parameters on microwave assisted photocatalytic degradation of azo dye X-3B with grain TiO2 catalyst

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Degradation of microcystin toxins in a falling film photocatalytic reactor with immobilized titanium dioxide catalyst

Cited by 120 publications

References 24 publications

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Electrochemical Degradation of Cyanobacterial Toxin Microcystin-LR Using Ti/RuO2Electrodes in a Continuous Tubular Reactor

Effect of operating parameters on microwave assisted photocatalytic degradation of azo dye X-3B with grain TiO2 catalyst

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Electrochemical Degradation of Cyanobacterial Toxin Microcystin-LR Using Ti/RuO₂Electrodes in a Continuous Tubular Reactor