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RGO-ZnTe: A Graphene Based Composite for Tetracycline Degradation and Their Synergistic Effect
journal contribution
posted on 2018-06-18, 22:03 authored by Koushik Chakraborty, Tanusri Pal, Surajit GhoshFor
a high-performance photocatalyst, efficient exciton formation
and subsequent dissociation, effective interfacial charge separation,
and transportation to the photocatalytic reduction active sites are
highly desired. Here, the visible-light-responsive reduced graphene
oxide-zinc telluride (RGO-ZnTe) photocatalyst was synthesized by a
single-pot one-step solvothermal process. Analysis of chemical compositions
and structural and morphological characterization of the as-synthesized
RGO-ZnTe samples were carried out intensively by TGA, XRD, XPS, TEM,
and SEM study. Efficient transport of photoinduced electrons from
ZnTe to RGO through their interface is confirmed by photoluminescence
(PL) study. It is observed that the RGO mats are well-decorated with
ZnTe nanoparticles, where RGO acts as a solid support as well as a
nucleation center of the ZnTe nanocrystal. The RGO-ZnTe composite
exhibited higher (6 times compared to RGO and 2.6 times compared to
ZnTe) photocatalytic efficiency toward the visible-light-driven photodegradation
of tetracycline (TC) antibiotics. Efficient catalytic performance
is ascribed to better interaction and synergy among RGO and ZnTe.
In the RGO-ZnTe composite the 2D wrinkled surface of RGO has a vital
role in receiving the enhanced performance of ZnTe nanoparticle by
minimizing the recombination probabilities of the photoinduced electron–hole.
The responsible reactive species for photocatalytic TC degradation
are also investigated comprehensively, which confirms that both holes
and oxygen radicals have a dominating role toward the degradation
of TC.
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Keywords
solvothermal processZnTe nanocrystalexciton formationSEM studyXPSEfficient transportvisible-light-driven photodegradation2 DZnTe nanoparticleTetracycline Degradationphotocatalytic reductionphotoinduced electronsPLXRDreactive speciesoxygen radicalsgraphene oxide-zinc tellurideTEMphotocatalytic efficiencyphotocatalytic TC degradationas-synthesized RGO-ZnTe samplescharge separationSynergistic Effectnucleation centerRGO actsTGAchemical compositionsRGO matsrecombination probabilitiesZnTe nanoparticles2.6 times
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