Effects of TiO2 nanostructure and operating parameters on optimized water disinfection processes: A comparative study

Sun, Darren Delai; Wu, You Zhen; Gao, Peng

doi:10.1016/j.cej.2014.03.079

Cited by 17 publications

(7 citation statements)

References 33 publications

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“…Beside, under different design and selection of preparation conditions, TiO 2 nanomaterials showed with various morphology, such as nanofiber, nanowire, nanotubes, nanoparticles and so on [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Zhang

Gong

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Zhang

Gong

et al. 2015

Journal of Alloys and Compounds

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“…The ability to characterize particle interface structures meaningfully in aqueous media is of importance in a range of highvalue industrial processes and applications including catalysis, 1 pharmaceutics, 2 and water treatment 3 and across the broader field of chemical engineering.…”

Section: Introductionmentioning

confidence: 99%

Scalable Surface Area Characterization by Electrokinetic Analysis of Complex Anion Adsorption

et al. 2014

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By means of the in situ electrokinetic assessment of aqueous particles in conjunction with the addition of anionic adsorbates, we develop and examine a new approach to the scalable characterization of the specific accessible surface area of particles in water. For alumina powders of differing morphology in mildly acidic aqueous suspensions, the effective surface charge was modified by carboxylate anion adsorption through the incremental addition of oxalic and citric acids. The observed zeta potential variation as a function of the proportional reagent additive was found to exhibit inverse hyperbolic sine-type behavior predicted to arise from monolayer adsorption following the Grahame-Langmuir model. Through parameter optimization by inverse problem solving, the zeta potential shift with relative adsorbate addition revealed a nearly linear correlation of a defined surface-area-dependent parameter with the conventionally measured surface area values of the powders, demonstrating that the proposed analytical framework is applicable for the in situ surface area characterization of aqueous particulate matter. The investigated methods have advantages over some conventional surface analysis techniques owing to their direct applicability in aqueous environments at ambient temperature and the ability to modify analysis scales by variation of the adsorption cross section.

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“…Effects of different anions in water have been well investigated and most of them would decrease the photocatalytic inactivation efficiency. For example, the present of SO 4 NH 3 could consume the reactive species (usually h + or •OH) and form a weaker oxidative radical, such as ˙SO 4-[44][45]. In contrast,…”

mentioning

confidence: 99%

Effects of bromide on inactivation efficacy and disinfection byproduct formation in photocatalytic inactivation

Chow

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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The high effectiveness of TiO 2-UVA system in bacterial disinfection has gained attention to use this technology in water treatment on different source waters, including desalinated sea water and grey water. However, source waters containing a significant level of bromide could have different chemical pathways during TiO 2-UVA disinfection process because reactive bromine species could be formed. To illustrate the water safety from the Br-TiO 2-UVA system, this study investigated bacterial inactivation efficiency and disinfection byproduct (DBP) formation under different pH, TiO 2 dosages and bromide concentrations in a laboratory setting. At a high bromide concentration (65 mg/L, equivalent to the concentration of natural sea water), the bacterial inactivation rate increased 2 times at pH 5 and more than 5 times at pH 8. However, a significant increase of brominated DBPs, which were considered more carcinogenic and toxic than chlorinated DBPs, was observed. The bacterial inactivation pattern was shifted from the "shoulder-log" to the "log-tail" under different bromide concentrations, suggesting the existence of bromide altered the bacterial inactivation mechanisms. We also observed that the inactivation kinetics of Br-TiO 2-UVA system was greatly influenced by water pH. Our laboratory experiments demonstrated that bromide could improve the performance of photocatalytic inactivation, but it also could reduce the water safety by generating a higher level of brominated-DBPs in treated water. Water engineers should pay attention to the brominated DBP formation when applying TiO 2-UVA photocatalysis on source waters with a significant level of bromide.

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Effects of TiO2 nanostructure and operating parameters on optimized water disinfection processes: A comparative study

Cited by 17 publications

References 33 publications

Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Enhanced charge collection and photocatalysis performance of CdS and PbS nanoclusters co-sensitized TiO2 porous film

Scalable Surface Area Characterization by Electrokinetic Analysis of Complex Anion Adsorption

Effects of bromide on inactivation efficacy and disinfection byproduct formation in photocatalytic inactivation

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