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Photocatalytic Degradation of Diclofenac Using Al2O3-Nd2O3 Binary Oxides Prepared by the Sol-Gel Method.


ABSTRACT: This paper reports the sol-gel synthesis of Al2O3-Nd2O3 (Al-Nd-x; x = 5%, 10%, 15% and 25% of Nd2O3) binary oxides and the photodegradation of diclofenac activated by UV light. Al-Nd-based catalysts were analyzed by N2 physisorption, XRD, TEM, SEM, UV-Vis and PL spectroscopies. The inclusion of Nd2O3 in the aluminum oxide matrix in the 10-25% range reduced the band gap energies from 3.35 eV for the ?-Al2O3 to values as low as 3.13-3.20 eV, which are typical of semiconductor materials absorbing in the UV region. ?-Al2O3 and Al-Nd-x binary oxides reached more than 92.0% of photoconverted diclofenac after 40 min of reaction. However, the photocatalytic activity in the diclofenac degradation using Al-Nd-x with Nd2O3 contents in the range 10-25% was improved with respect to that of ?-Al2O3 at short reaction times. The diclofenac photoconversion using ?-Al2O3 was 63.0% at 10 min of UV light exposure, whereas Al-Nd-15 binary oxide reached 82.0% at this reaction time. The rate constants determined from the kinetic experiments revealed that the highest activities in the aqueous medium were reached with the catalysts with 15% and 25% of Nd2O3, and these compounds presented the lowest band gap energies. The experimental results also demonstrated that Nd2O3 acts as a separator of charges favoring the decrease in the recombination rate of electron-hole pairs.

SUBMITTER: Casillas JE 

PROVIDER: S-EPMC7142804 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Photocatalytic Degradation of Diclofenac Using Al<sub>2</sub>O<sub>3</sub>-Nd<sub>2</sub>O<sub>3</sub> Binary Oxides Prepared by the Sol-Gel Method.

Casillas José Eduardo JE   Campa-Molina Jorge J   Tzompantzi Francisco F   Carbajal Arízaga Gregorio Guadalupe GG   López-Gaona Alejandro A   Ulloa-Godínez Sandra S   Cano Mario Eduardo ME   Barrera Arturo A  

Materials (Basel, Switzerland) 20200316 6


This paper reports the sol-gel synthesis of Al<sub>2</sub>O<sub>3</sub>-Nd<sub>2</sub>O<sub>3</sub> (Al-Nd-<i>x</i>; <i>x</i> = 5%, 10%, 15% and 25% of Nd<sub>2</sub>O<sub>3</sub>) binary oxides and the photodegradation of diclofenac activated by UV light. Al-Nd-based catalysts were analyzed by N<sub>2</sub> physisorption, XRD, TEM, SEM, UV-Vis and PL spectroscopies. The inclusion of Nd<sub>2</sub>O<sub>3</sub> in the aluminum oxide matrix in the 10-25% range reduced the band gap energies from 3  ...[more]

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