A new nano-ZnO/perlite as an efficient catalyst for catalytic ozonation of azo dye

Abstract

In this investigation, nano ZnO was sonochemically synthesized by a novel method using a methionine precursor. A narrow size distribution (41-50 nm) of nano ZnO was achieved that was immobilized on perlite and applied as a catalyst in catalytic ozonation. The catalyst was characterized by fourier transform infrared spectroscopy, BET surface area, and field emission scanning electron microscope. The ozonation of recalcitrant Remazol black 5 (RB5) di-azo dye solution by means of the synthesized catalyst was investigated in a bubble column slurry reactor. The influence of pH values (7, 9, 11), catalyst dosage (8, 12, 15, 20 g L −1) and reaction time (10, 20, 30, 60 min) was investigated. Although the dye color was completely removed by single ozonation at a higher reaction time, the applied nanocatalyst improved the dye declorination kinetics. Also, the degradation of the hazardous aromatic fraction of the dye was enhanced five-times by catalytic ozonation at a low reaction time (10 min) and a neutral pH. The second-order kinetics was best fitted in terms of both RB5 color and its aromatic fraction removal. The total organic carbon analysis indicated a significant improvement in the mineralization of RB5 by catalytic ozonation using the nano-ZnO/perlite catalyst.

Enhancing acid orange II degradation in ozonation processes with CaFe2O4 nanoparticles as a heterogeneous catalyst

“… 47 Another study mentioned using a manganese catalyst in heterogeneous catalytic ozonation, indicating that hydroxyl radicals play a significant role in the oxidation process. 48 Shokrollahzadeh et al 17 also reported that adding a nano-ZnO/perlite nanocatalyst increased the degradation rate during the catalytic ozonation of an azo dye. Overall, these references demonstrated that nanocatalysts improved the performance of catalytic ozonation systems by producing hydroxyl radicals.…”

“…In the context of Shokrollahzadeh et al (2019) 17 research concerning nano-ZnO/pearl stone use for reactive blue 5 degradation, a higher efficacy was demonstrated, surpassing the 92% TOC removal efficiency. Compared to Zhang et al (2022), 68 who focused on methyl orange degradation by utilizing nano MnO 2 particles, the current study showed slightly lower degradation efficiency.…”

“… 16 The nano-ZnO/perlite catalyst has been used for catalytic ozonation of azo dyes, significantly improving the dye's mineralization. 17 In addition, Fe–Ni bimetallic nanoparticles have been utilized as a catalyst for the degradation of orange G dye by ozone. 18 In a recent study conducted by Meng et al (2022), 19 an assessment was carried out regarding the advancements and obstacles encountered in the electro- and photocatalytic oxidation of hydroxymethylfurfural derived from biomass.…”

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

“…Owing to its floatability, rich silica and alumina content, chemically inert nature, perlite has been gaining research interest as a catalyst or catalyst support material these days. Recently, perlite has been reported as a heterogeneous catalyst in numerous applications including, Fenton degradation, [ 10 ] green synthesis of aryl/alkyl methanes, [ 11 ] photocatalysis, [ 12 ] economical preparation of xanthenes, [ 13 ] biodiesel synthesis, [ 14 ] Knoevenagel condensation, [ 15,16 ] azo dye ozonation, [ 17 ] hydrogenation, [ 18 ] etc. It is thus assumed, perlite having richer silica and alumina composition can possess a significant amount of stable surface‐active sites after proper treatment and hence can be converted into a potential heterogeneous acid catalyst for different acid‐catalyzed industrially useful organic transformations.…”

A study on novel coupled membrane bioreactor with electro oxidation for biofouling reduction

“…To overcome the disadvantages in MBR, pretreatment prior to MBR is required. Advanced oxidation process such as photocatalysis [15], electro-oxidation, ozonation [16] and UV/H 2 O 2 provides a better and compromising solution for pretreatment of wastewater. Electro-oxidation (EO) process increases the biodegradability index (BI) by decomposing the complex compounds, thereby increasing the activity of biological treatment prevailing in the MBR to degrade pollutants.…”