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Photocatalytic degradation of Methylene Blue (MB) dye under UV/visible light by TiO2 nanoparticle self-assembled commercial polyethersulfone ultramembrane

IWRA World Water Congress 2017 - Cancun Mexico
2. Water quality, wastewater and reuse
Author(s): Rosangela Bergamasco
Priscila F Coldebella
Franciele Camacho
Driano Rezende
Leticia Nishi
Marcia R F Klen
Angelica M S Vie
Rosangela Bergamasco
State University of Maringá, Brazil
ro.bergamasco@hotmail.com
Priscila F Coldebella
State University of Maringá, Brazil
pricoldebella@gmail.com
Franciele Camacho
State University of Maringá, Brazil
franciele_camacho@hotmail.com
Driano Rezende
State University of Maringá, Brazil
drirezend@gmail.com
Leticia Nishi
State University of Maringá, Brazil
leticianishi12@gmail.com
Marcia R F Klen
State University of West Paraná Federal
fagundes.klen@gmail.com
Angelica M S Vieira
State University of Maringá, Brazil
angelicamsalcedo@hotmail.com
Marcelo F Vieira
State University of Maringá, Brazil
marcelofvieira@hotmail.com
carlos Tavares
University of Minho, Portugal
mtamorim@det.uminho.pt
Maria T Amorim
University of Minho, Portugal
mtamorim@det.uminho.pt


Keyword(s): nanoparticle, degradation of Methylene Blue, polyethersulfone ultramembrane
Oral:

Abstract

Titanium dioxide (TiO2) in different forms such as films, fibers or particles has been the focus of numerous investigations in recent years, because of its photocatalytic effects that decompose organic chemicals, and shows good hydrophilic properties in surface of membranes.  Combined with these characteristics, in this study, Polyethersulfone (PES) ultramembrane was self-assembled with TiO2 nanoparticles for the purpose of photocatalytic degradation capability of Methylene Blue (MB) dye and fouling reduction. The PES membrane with an diameter of 47 mm was dipped in the colloidal solution of 0,5% (w/v) TiO2 powder (Degussa–Hüls, P-25) for 1:30 h at 5 bar pressure to deposit TiO2 nanoparticles on the membrane surface and then washed with water. The membrane was prepared using a filtration module HP4750 StirredCell (Sterlitech ©). To evaluate the changing surface properties, the membrane before and after modification was characterized by analysis water permeability, contact angle, scanning electron microscope (SEM) and the photocatalytic activity. The photocatalytic performance of the processed samples was measured by following the degradation capability of 1.10−6 mol.L-1 MB dye solution irradiated with a high power LED source (Thorlabs, 700 mA) with an excitation peak at 365 nm (UV-A). Results showed that the TiO2 self-assembled in PES membrane demonstrated a remarkable photocatalytic activity with over 80% MB removed from the solution after 100 min of UV radiation. The SEM photographs showed TiO2 aggregates on the top surface of the modified membranes. The lower the contact angle means higher hydrophilicity of the membrane surface, however the water permeability experiments showed a decrease flow from 19.53 to 10.47 L.h-1.m-2.bar-1. The reduced flow could be due TiO2 nanoparticles have entered the pores on the membrane surface. With the results, the applied method for TiO2 deposition was suitable for membrane morphology modification. The TiO2 photocatalytic properties in the MB dye degradation may indicate promising mitigation to the fouling effects of PES membrane.

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