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Sol–gel synthesis of Tb‐doped hydroxyapatite with high performance as photocatalyst for 2, 4 dichlorophenoxyacetic acid mineralization
Author(s) -
JiménezFlores Yolanda,
SuárezQuezada Monserrat,
RojasTrigos José Bruno,
Suárez Victor,
Mantilla Angeles
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5270
Subject(s) - terbium , photodegradation , photocatalysis , doping , fourier transform infrared spectroscopy , nuclear chemistry , dopant , mineralization (soil science) , photoluminescence , sol gel , materials science , irradiation , stoichiometry , spectroscopy , inorganic chemistry , chemistry , catalysis , luminescence , chemical engineering , organic chemistry , nanotechnology , quantum mechanics , nitrogen , optoelectronics , physics , nuclear physics , engineering
BACKGROUND Tb 3+ doped hydroxyapatite was synthetized by the sol–gel technique, using amounts of the dopant source ranging from 2 to 12 wt%, with respect to the calcium former material. The solids were analyzed using several techniques in order to determine their structural, textural and optical properties. The photoactivity of the materials was tested in the degradation of 2,4‐dichlorophenoxyacetic acid, under UV irradiation. RESULTS The analysis of the samples by X‐ray diffraction, energy‐dispersive X‐ray spectroscopy and Fourier transform infrared spectroscopy indicates the formation of hydroxyapatite with calcium deficiency, with a stoichiometry close to the ideal in the sample doped with 10 wt% of terbium. The highest photoluminescence emission, production of •OH radicals under UV in the terephtalic acid reaction, as well as photocatalytic activity in the photodegradation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) was found in the sample doped with 10 wt% of terbium, reaching almost total degradation and 95% of mineralization of the organic molecule, after 240 min irradiation. CONCLUSION Terbium doping during the synthesis of hydroxyapatite significantly improves its efficiency as photocatalyst. © 2017 Society of Chemical Industry