Abstracts Book - IMRC 2018

• SF5-P098
SYNTHESIS AND CHARACTERIZATION OF TUNGSTEN TRIOXIDE
MATERIALS FOR THE EVALUATION IN THE HETEROGENEOUS
PHOTODEGRADATION OF 2, 4- DICHLOROPHENOXYACETIC ACID
Karina del Carmen Jimenez Cordova 1 , Rosendo López González 1 , Dora María Frías Márquez 1 ,
Mayra Angelica Alvarez Lemus 1 , Luis Alberto Feria Miranda 1
1 Universidad Juárez Autónoma de Tabasco, Division Academica de Ingenieria y Arquitectura,
Mexico.
The 2,4-dichlorophenoxyacetic acid (2,4-D) is one of the most used herbicides,
their presence can cause unpredictable toxicological effects on the
environment. Heterogeneous photocatalysis is an alternative to solve the
problems of treatment of persistent, non-biodegradable and highly toxic
organic compounds, for this broadband semiconductor can be activated why
visible light or ultraviolet radiation. Tungsten trioxide (WO 3 ) is an effective
semiconductor that can be activated why light of low energy, therefore, in this
work WO 3 nanoparticles were synthesized by acid precipitation method, using
sodium tungstate precursors (Na 2 WO 4 ) and hydrochloric acid (HCl). The WO 3
nanoparticles were performed a heat treatment for 4 hours at 500 ° C in a muffle
furnace subsequently characterized by XRD and UV-Vis spectroscopy by diffuse
reflectance. Photocatalytic evaluation using as source of irradiation an
ultraviolet lamp at low intensity. The of X-ray analysis showed that the crystalline
form was good WO 3 in orthorhombic phase according to standard PDF 00-020-
1324, having a crystal size of 26.6 nm. The most representative peak is 102 nm
in with a crystalline plan 2, 0, 2, 0. The reflectance spectra obtained by UV-Vis
determined energy bandgap (Eg) value of 2.68 eV corresponding to wavelength
of visible light of 462 nm. The photocatalytic evaluation determined a good yield
degradation of the pollutant (2, 4- D).
Acknowledgment:
PDCPN PROJECT 718. CONACYT
Keywords: 2,4-dichlorophenoxyacetic acid, Heterogeneous photocatalysis,
Degradation
Presenting authors email: karyna_0228@hotmail.com