Sonocatalytic degradation of an anthraquinone dye using TiO2-biochar nanocomposite

Abstract

TiO-biochar (TiO-BC) nanocomposite was synthesized by sol-gel method. The characteristics of the prepared nanocomposite were examined using X-ray fluorescence, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and N adsorption-desorption analysis. The performance of synthesized TiO-BC nanocomposite as efficient sonocatalyst was studied for the degradation of Reactive Blue 69 (RB69). Sonocatalytic degradation of RB69 in the presence of TiO-BC nanocomposite could be explained by the mechanisms of hot spots and sonoluminescence. The optimized values for main operational parameters were determined as pH of 7, TiO-BC dosage of 1.5g/L, RB69 initial concentration of 20mg/L and ultrasonic power of 300W. Furthermore, the effect of OH, h and O scavengers on the RB69 degradation efficiency was studied. Gas chromatography-mass spectroscopy analysis was used to identify intermediate compounds formed during the RB69 degradation. The results of repeated applications of TiO-BC in the sonocatalytic process verified its stability in long-term usage.

Photocatalytic decontamination of phenol and petrochemical wastewater through ZnO/TiO2 decorated on reduced graphene oxide nanocomposite: influential operating factors, mechanism, and electrical energy consumption

“…This reduces the photocatalytic activity by limiting the light absorption capability of photocatalysts and lowering the concentration of $O À and $OH. 19,46 Herein, to a better assess, the catalytic activity of the synthesized GZnTi was compared with the detoxication of phenol reported in previous studies (see Table 3). GZnTi showed more photocatalytic performance because it indicated higher amounts of decontamination in less time under visible light than other catalysts.…”

Construction of Z‐scheme Pt‐TiO2/(Er3+:Y3Al5O12@Ta2O5)/HAP and its application in sonocatalytic degradation of prometryn and disinfection of Escherichia coli

“…Hot spots can bring high temperature and high pressure, which can dissociate water molecules to various reactive oxygen species (ROS). The produced ROS can decompose organic pollutants in wastewater to water (H 2 O), carbon dioxide (CO 2 ) and inorganic ions . Though, the use of only ultrasonic irradiation technology needs longer processing time and more energy to completely degrade the organic pollutants in wastewater .…”

“…To solve these problems, the combination of the ultrasonic irradiation and suitable semiconductor sonocatalysts with excellent properties may be a very effective method for the treatment of wastewater. On the one hand, the combination of the ultrasonic wave with sonocatalyst particles can produce synergistic effects, which can enhance the degradation efficiency of organic pollutants . On the other hand, being similar to the photocatalytic reaction process, the ‘sonoluminescence’ can bring wide wavelength range lights to excite the semiconductor sonocatalyst, producing photo‐generated electrons (e − ) and holes (h + ) on the conduction band (CB) and the valence band (VB), respectively.…”

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

“…Over the years, photocatalytic degradation of TC from wastewater has achieved tangible advances . However, the complete abatement of organic pollutants by photodecomposition only has been shown to be time consuming and laborious . In this regard, the photoelectrocatalytic (PEC) technology which combines electrochemical system and photocatalysis have piqued the interest of researchers due to its energy‐efficiency and less secondary pollution .…”