Photocatalytic treatment of oil and grease spills in wastewater using coated N-doped TiO2 polyscales under sunlight as an alternative driving energy

Abstract

To enhance the overall efficiency of oil and grease removal in wastewater coated N-doped TiO 2 photocatalytic polyscales were fabricated through sol-gel technique. The materials fabricated were characterized using powder X-ray diffraction, Fourier transmission infrared spectroscopy, scanning electron microscopy, and UV-Vis spectroscopy. In order to enhance degradation efficiency of organic pollutant under natural sun light, shifting of absorption range of TiO 2 to visible spectrum, various modifications such as surface modification and size optimization were carried out by doping of nitrogen under solgel processes. To ease recovery of suspended catalysts from aqueous media, the coated N-doped TiO 2 were prepared by decorating photocatalytic particles onto suitable substrates. N-doped TiO 2 polyscales with desired functionalities were coated onto the spherical supporting substrates using a binding agent. The photocatalytic treatment studies clearly indicated the considerable level of the oil and grease and other organic pollutants removal from wastewater (up to 85-90 % ± 2) using coated N-doped TiO 2 under natural sunlight as an alternative driving energy source. Removal of oil and grease along with other organic pollutants in wastewater using coated N-doped TiO 2 polyscales is a versatile, economical, and environmental friendly technique due to the ease of handling and recovery, utilization of natural sunlight which is renewable energy source.

Degradation of selected industrial dyes using Mg-doped TiO2 polyscales under natural sun light as an alternative driving energy

“…Photocatalytic degradation is one of the most promising green technologies that can be relied to complete removal of organic dyes and colorants in industrial wastewater without producing any residues and secondary pollutants (Lathasree et al 2004;Lizama et al 2002). Titanium dioxide (TiO 2 ) is a widely used photocatalyst because of its chemical stability, abundance, inoffensiveness, and lot of applications in various fields (Kusvuran et al 2005;Fuyuki et al 1988;Kurtz and Gordon 1986;Shivaraju et al 2016). However, light absorption range of pure TiO 2 is limited to the ultraviolet (UV) spectrum of light due to its wide bandgap (approximately 3.2 eV).…”

Facile synthesis of Mn‐Ce/N‐TiO2 composite for CO2 hydrogenation into methane and intensifying methane yield in biomethanation

“…211272 and 211 276), which enhance the photocatalytic activities under a visible range. 8,15 Titanium oxide rutile phases are usually observed at a calcination temperature of >450 °C for 4-5 h duration and under a high calcination temperature the anatase phase is completely changed into the rutile phase. 16 Mixed phases observed for the anatase and rutile in Mn-Ce/ N-TiO 2 composite prepared at 380 °C for 2 h could be due to the presence of N-dopant and the intrusion of co-catalysts (Mn and Ce) in the TiO 2 core shell system.…”

“…Band shifting towards the visible range indicates an appropriate proportion of co-catalysts in the composite system, inducing higher visible light absorption and the enhancement of photo-generated holes and electrons compared with intrinsic TiO 2. 8,10,15 The synergetic effect of Mn-Ce on N-TiO 2 provided a continuous electron pathway by suppressing the electron-hole pairs recombination, which apparently enhances the high-intensity photon absorption potential and photoelectrocatalysis properties under visible light sources. 21,22 Overall reduced band-gap .…”

“…21,22 Overall reduced band-gap . 15 The development of heterojunction band edges within the TiO 2 core shell structure enhances the solar light absorption potential with continuous electron pathways for PHR-POR that apparently induce CO 2 hydrogenation and methane production rates in the photocatalysis process. The DLS results for the Mn-Ce/N-TiO 2 composite showed potential distribution particles in the nanoscale level range (Fig.…”

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

“…Studies have shown that TiO 2 photocatalysts can float on the water surface and are efficient in the degradation of toxic and recalcitrant pollutants [233]. Shivaraju et al [234] prepared N-doped TiO 2 . They reported the degradation rate of oil and grease and other organic pollutants in wastewater can reach about 90%.…”