Synthesis and characterization of TiO₂/C nanomaterials: Applications in water treatment

Abstract

The TiO2 deposition on high surface possessing supports can increase the photocatalytic efficiency of a semiconductor, as already shown in the literature because, the high adsorption capacity of the support can help to enrich the organic substrate around the catalyst promoting the charge‐transfer process between the pollutants and the photocatalysts. Consequently, in this study, we investigated the synthesis of composite photocatalytic materials based on TiO2 and different types of carbon. Titanium tetrachloride (TiCl4) was used as the precursor, while graphite, activated carbon and carbon aerogels were chosen as carbon supports. An optimization of the synthesis method was proposed by varying the molar ratio titanium/carbon (Ti/C). The obtained materials were characterized by XRD, TEM, and UV–Vis DRS. The specific surface area, pore volume, and pore‐size distribution were evaluated by nitrogen adsorption/desorption. The photocatalytic activity was investigated by the photodegradation of diuron.

TiO2 and TiO2-Carbon Hybrid Photocatalysts for Diuron Removal from Water

“…Cruz et al [60] studied the photodegradation of diuron using graphene oxide-TiO 2 catalyst and showed that 79 min of irradiation were needed to achieve 50% diuron conversion. Bamba et al [32] studied TiO 2 photocatalysts containing activated carbon and reported a diuron removal efficiency of 99.95 and 98.61% after 90 min in darkness and 180 min under irradiation for P25 and TiO 2 -AC, respectively (TiO 2 -AC was prepared by sol-gel method, with a surface area of 206 m 2 /g and 99.2% of anatase).…”

“…These authors reported that hybrid TiO 2 -AC samples lead to significant better performance in herbicide removal than the independent adsorption by AC or the photocatalytic degradation by TiO 2 [30,31]. Bamba et al studied the activity of TiO 2 prepared by sol-gel deposited on carbon materials such as AC, graphite, and carbon aerogel, for diuron photodegradation [32]. They found that TiO 2 /AC and TiO 2 /carbon aerogel samples were promising under sunlight irradiation, attributing the good behavior to a high anatase crystallinity, high specific surface area, and large pore volume.…”

Aplicação do dióxido de titânio como fotocatalisador na degradação do diuron: avaliação das variáveis operacionais e estudo mecanístico

“…Na degradação do DI, o pH (2 e 10), a concentração do herbicida (5 e 20 mg.L -1 ) e a concentração do catalisador (1 e 4 g.L -1 ) foram avaliados em um tempo reacional de 3 horas. Os valores das variáveis experimentais nesses ensaios correspondem às faixas de trabalho próximas às executadas em outros estudos (BAMBA et al, 2008(BAMBA et al, , 2015MINELGAITE et al, 2017).…”

Obtaining Silicon Oxide Nanoparticles Doped with Fluorine and Gold Particles by the Pulsed Plasma-Chemical Method

“…Silicon dioxide is used in radio electronics, in particular, the production of microcircuits and fibre optic cables [9,10]. At present, the properties of nanocomposite structures, which are used to create materials with preassigned properties, are being actively studied in modern solid-state physics [11][12][13][14]. Production of a composite based on SiO 2 with various chemical elements (C, Au, and F) enables the improvement of the physical and chemical properties of the synthesized composite and expands its scope of use.…”