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Ceramic photocatalytic membranes for water filtration under UV and visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
44938 46386 2015 8 PDF Available
Title
Ceramic photocatalytic membranes for water filtration under UV and visible light
Abstract

•TiO2 modified ceramic membranes for ultrafiltration/photocatalytic water treatment.•Innovative composite membrane based on reduced graphene oxide and TiO2.•Effective MB and MO decomposition under Vis and UV irradiation.•Energy efficient process due to the photoinduced superhydrophilicity.•Increased water recovery and antifouling properties compared to common NF membranes.

This work demonstrates the efficiency of a hybrid photocatalysis/ultrafiltration process to eliminate or reduce the contents of synthetic dyes in water. The process involves highly active photocatalytic ceramic ultrafiltration (UF) membranes prepared with the deposition of various photocatalysts on the external and internal (pore) surface of UF mono-channel monoliths. A main challenge consists in swapping from the conventional slurry-type photocatalytic purification technology to a novel photocatalytic membrane filtration technology, using the most prominent recently developed TiO2 based nanomaterials. With this objective, highly hydroxylated anatase TiO2 was deposited on ceramic monoliths by applying sol–gel (dip-coating) techniques. Novel materials comprising modified TiO2 nanocrystals covered with an organic shell layer as well as partially reduced graphene oxide-TiO2 composites were synthesized and stabilized on the monoliths aiming to develop visible light responding catalytic membranes. The photocatalytic filtration experiments took place in a patented water purification device in continuous flow conditions, using methylene blue (MB) and methyl orange (MO) as azo-dye model pollutants, under near-UV/vis and visible light irradiation. Trying to optimize the membrane photocatalytic efficiency we have examined the impact of several parameters related to both the membrane structure and the hybrid photocatalytic/ultrafiltration process including the amount, porosity and surface area of the stabilized photocatalysts as well as the surface charge. The process parameters were mainly related to the pH of the stream under treatment and the type of pollutant. Furthermore, the novel hybrid process was compared to the standard nanofiltration technique in regard to the pollutant removal efficiency and total energy consumption. As a consolidated output, this work proposes a novel photocatalytic membrane, developed via stabilization of organic shell layer covered TiO2 nanostructures on the internal and external surface of ceramic monoliths, as the most efficient material to be used in hybrid photocatalytic/ultrafiltration water treatment processes.

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Keywords
Ultrafiltration photocatalytic membranes; Titanium dioxide; Graphene oxide; Azo-dye pollutants; Clean water
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Ceramic photocatalytic membranes for water filtration under UV and visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 12–19
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us