The contribution of domestic sources to levels of key organic and inorganic pollutants in sewage: the case of Melbourne, Australia

Wilkie, Philip J.; Hatzimihalis, George; Koutoufides, Paul; Connor, M.

doi:10.1016/0273-1223(96)00557-4

Cited by 18 publications

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“…As photocatalysis over TiO 2 can remove any organic compound in pure water, apart from chlorofluorocarbons, , trifluoroacetic acid, and 2,4,6-trihydroxy-1,3,5-triazabenzene (cyanuric acid), it is not surprising that this advanced oxidation process mineralizes humic acids − (HA). The TiO 2 photocatalytic degradation and mineralization of Aldrich HA have been investigated by use of methods related to the optical properties 5-7 or molecular weight 6 of HA and by measurements of remaining organic carbon and formed CO 2 . − The number of studies dealing with the effect of HA on the photocatalytic degradation and mineralization of anthropogenic organic pollutants is still scarce. The cases of 2,4,6-trinitrotoluene, phenol, and tetrachloroethene have been investigated in detail; the case of tetrachloromethane 9 has also been considered although more briefly, whereas 2,4-dichlorophenol 9 was only mentioned along with phenol.…”

Section: Introductionmentioning

confidence: 99%

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal

and

Pichat

2001

Langmuir

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To expand the still-rare studies about the effect of humic acids (HA) on the photocatalytic removal of water organic pollutants over TiO2, quinoline was selected, considering the previously investigated aromatics. Dark adsorption measurements have shown that the amount of quinoline (initial concentration (C Q)o = 0.17 mmol L-1) adsorbed at equilibrium on TiO2 (50 m2 g-1; 2.5 g L-1) corresponds to only ca. 0.012 molecule nm-2. By contrast, HA (Aldrich Na salt) was found to completely cover TiO2 for the initial mass concentration (C m HA)o = 81 ppm, assuming a flat structure for adsorbed HA and a mean molar mass of 4 kg. Notwithstanding, HA did not hinder quinoline adsorption. Without TiO2, the fraction of quinoline chemically bound to HA was only ca. 1.5% for ( )o = 87 ppm; however, a weak quenching of quinoline fluorescence by HA illustrated the existence of looser interactions. The photocatalytic (λ ≥ 340 nm) initial removal rate, r o, of quinoline ((C Q)o = 0.077 − 0.77 mmol L-1) without HA was in agreement with a pseudo-first-order Langmuir−Hinshelwood kinetics, however, with an adsorption constant much higher than that deduced from dark adsorption. This difference suggests that the quinoline molecules involved should be not only those present in the monolayer, in accord with previous considerations for other poorly adsorbed compounds (J. Cunningham et al. In Aquatic and Surface Photochemistry; Helz, G. R. et al., Eds.; Lewis Publishers: Boca Raton, FL, 1994, p 317). For ( )o ≥ 12 ppm, r o was also pseudo-first-order at least initially, and its decrease was consistent with HA UV-light absorption (inner-filter effect) more than with the competition for the active species between HA and quinoline. For ( )o = 6 ppm, r o was slightly, but significantly, higher than without HA. This net, as yet unreported, favorable effect of HA, which was counterbalanced at higher ( )o /[TiO2] ratios, was shown not to arise from HA photoexcitation and is tentatively suggested to be caused by the sequestration of a fraction of quinoline molecules close to the TiO2 surface owing to adsorbed HA.

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Section: Introductionmentioning

confidence: 99%

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal

and

Pichat

2001

Langmuir

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Chemometric data analysis of pollutants in wastewater—a case study

Singh

Malik

Mohan

et al. 2005

Analytica Chimica Acta

113

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Diffuse sources of heavy metals entering an urban wastewater catchment

et al. 2006

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The contribution of domestic sources to levels of key organic and inorganic pollutants in sewage: the case of Melbourne, Australia

Cited by 18 publications

References 0 publications

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal

Chemometric data analysis of pollutants in wastewater—a case study

Diffuse sources of heavy metals entering an urban wastewater catchment

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The contribution of domestic sources to levels of key organic and inorganic pollutants in sewage: the case of Melbourne, Australia

Cited by 18 publications

References 0 publications

Interactions of Humic Acid, Quinoline, and TiO2 in Water in Relation to Quinoline Photocatalytic Removal

Interactions of Humic Acid, Quinoline, and TiO2 in Water in Relation to Quinoline Photocatalytic Removal

Chemometric data analysis of pollutants in wastewater—a case study

Diffuse sources of heavy metals entering an urban wastewater catchment

Contact Info

Product

Resources

About

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal

Interactions of Humic Acid, Quinoline, and TiO₂ in Water in Relation to Quinoline Photocatalytic Removal