Few-Layer MoS₂ Nanodomains Decorating TiO₂ Nanoparticles: A Case Study for the Photodegradation of Carbamazepine

S-doped TiO₂ and hybrid MoS₂/TiO₂ systems have been synthesized, via the sulfidation with H₂S of the bare TiO₂ and of MoO supported on TiO₂ systems, with the aim of enhancing the photocatalytic properties of TiO₂ for the degradation of carbamazepine, an anticonvulsant drug, whose residues and metabo...

Full description

Saved in:
Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2018-03, Vol.8 (4), p.207
Main Authors: Cravanzola, Sara, Sarro, Marco, Cesano, Federico, Calza, Paola, Scarano, Domenica
Format: Article
Language:English
Subjects:
Acridine
Anticonvulsants
Carbamazepine
Electron states
Fourier transforms
FTIR spectroscopy
hybrid materials
Hybrid systems
Hydrogen sulfide
Infrared spectra
Infrared spectroscopy
Metabolites
Mineralization
Molybdenum disulfide
MoS2
Nanoparticles
Optical properties
Photocatalysis
photocatalytic activity
Photodegradation
Raman spectroscopy
Spectrum analysis
Sulfidation
Surface properties
TiO2
Titanium
Titanium dioxide
Transmission electron microscopy
UV-Vis spectroscopy
Wastewater treatment
Wastewater treatment plants
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:S-doped TiO₂ and hybrid MoS₂/TiO₂ systems have been synthesized, via the sulfidation with H₂S of the bare TiO₂ and of MoO supported on TiO₂ systems, with the aim of enhancing the photocatalytic properties of TiO₂ for the degradation of carbamazepine, an anticonvulsant drug, whose residues and metabolites are usually inefficiently removed in wastewater treatment plants. The focus of this study is to find a relationship between the morphology/structure/surface properties and photoactivity. The full characterization of samples reveals the strong effects of the H₂S action on the properties of TiO₂, with the formation of defects at the surface, as shown by transmission electron microscopy (TEM) and infrared spectroscopy (IR), while also the optical properties are strongly affected by the sulfidation treatment, with changes in the electronic states of TiO₂. Meanwhile, the formation of small and thin few-layer MoS₂ domains, decorating the TiO₂ surface, is evidenced by both high-resolution transmission electron microscopy (HRTEM) and UV-Vis/Raman spectroscopies, while Fourier-transform infrared (FTIR) spectra give insights into the nature of Ti and Mo surface sites. The most interesting findings of our research are the enhanced photoactivity of the MoS₂/TiO₂ hybrid photocatalyst toward the carbamazepine mineralization. Surprisingly, the formation of hazardous compounds (i.e., acridine derivatives), usually obtained from carbamazepine, is precluded when treated with MoS₂/TiO₂ systems.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano8040207