000263431 001__ 263431
000263431 005__ 20190227085938.0
000263431 022__ $$a1385-8947
000263431 022__ $$a1873-3212
000263431 02470 $$a000450105700021$$2isi
000263431 0247_ $$a10.1016/j.cej.2018.09.219$$2doi
000263431 037__ $$aARTICLE
000263431 245__ $$aEnhancing solar disinfection of water in PET bottles by optimized in-situ formation of iron oxide films. From heterogeneous to homogeneous action modes with H2O2 vs. O-2 - Part 1: Iron salts as oxide precursors
000263431 260__ $$c2019$$aLausanne$$bELSEVIER SCIENCE SA
000263431 269__ $$a2019-02-15
000263431 336__ $$aJournal Articles
000263431 520__ $$aSolar disinfection (SODIS) is a WHO-accepted intervention method for improving water sources in developing countries. Despite its effectiveness, the limitations of long exposure and bacterial regrowth risk demand further improvement of the practice. In this work, we have generated an iron oxide film on the inner surface of PET bottles used in SODIS, to generate further pathways of solar-mediated inactivation, namely a semiconductor mode of action and controlled iron leaching in the system, which both have demonstrated bactericidal capacity. More specifically, in this Part 1, the deposition process using Fe salts has been scrutinized, assessing the use of various homogeneous Fe precursors (FeCl3 , FeSO4 and Fe-2(SO4)(3)), amounts of iron (0.5-20 g/L) and deposition time (1-8 h) to find the delicate balance among deposition layer thickness and light penetration. At the optimal conditions (4 h deposition, 1 g/L FeCl3 ) SODIS was enhanced, reducing 60% the exposure time; a simple washing step brought a further reduction (70%), while eliminating regrowth in volumes from 330 up to 1500 mL reactors. A robust process and reactor was attained, able to reuse its precursor solution almost 10 times and the reactor in 5 consecutive tests, without the need for re-deposition. The modification also proved to be an invaluable iron source to fuel the photo-Fenton process, when H2O2 as an electron acceptor was added to the system. The improvement induced by the heterogeneous photo-Fenton process was around 80% compared to the SODIS/H2O2 process in plain PET bottles and exceeded 85% when compared to SODIS, while being durable to the high oxidative conditions. Finally, in the view of application in drinking water treatment, the process performed well in the lightly acidic region, due to the physicochemical implications of natural waters' pH in iron cycling.
000263431 650__ $$aEngineering, Environmental
000263431 650__ $$aEngineering, Chemical
000263431 650__ $$aEngineering
000263431 6531_ $$asolar disinfection (sodis)
000263431 6531_ $$asemiconductor
000263431 6531_ $$aphoto-fenton
000263431 6531_ $$abacterial inactivation
000263431 6531_ $$airon films
000263431 6531_ $$amunicipal waste-water
000263431 6531_ $$aadvanced oxidation processes
000263431 6531_ $$aphoto-fenton processes
000263431 6531_ $$anatural organic-acids
000263431 6531_ $$azero-valent iron
000263431 6531_ $$anear-neutral ph
000263431 6531_ $$aescherichia-coli
000263431 6531_ $$abacterial inactivation
000263431 6531_ $$aphotocatalytic disinfection
000263431 6531_ $$aaqueous-solution
000263431 700__ $$aShekoohiyan, Sakine
000263431 700__ $$aRtimi, Sami$$0247403
000263431 700__ $$aMoussavi, Gholamreza
000263431 700__ $$aGiannakis, Stefanos$$0247901
000263431 700__ $$aPulgarin, Cesar$$0240005
000263431 773__ $$j358$$q211-224$$tChemical Engineering Journal
000263431 909C0 $$xU12575$$0252422$$pGPAO
000263431 909CO $$ooai:infoscience.epfl.ch:263431$$particle$$pSB
000263431 973__ $$aEPFL$$sPUBLISHED$$rREVIEWED
000263431 980__ $$aARTICLE
000263431 980__ $$aWoS