Application of Heterogeneous Catalytic Ozonation Process with Magnesium Oxide Nanoparticles for Toluene Degradation in Aqueous Environments

Abstract

Background: Volatile organic compounds (VOCs) removal like toluene is an important concern for health of humans and the environment. Objectives:In this study, the efficiency of heterogeneous catalytic ozonation process (COP) with MgO nanoparticles for toluene degradation in aqueous solutions was investigated. Materials and Methods:Response surface methodology (RSM) using central composite design (CCD) was applied to study the interactions between critical operating factors and to find their optimum levels. Four independent factors namely pH, catalyst dosage, ozonation time and concentration of toluene were transformed to coded values and consequently a second order quadratic model was prepared for responses prediction. Results:The analysis of variance (ANOVA) of the toluene degradation by COP/MgO nanoparticles showed F-value of 19.53 for the quadratic model indicating that the prepared model is significant. The predicted result showed that maximum degradation of toluene (~99.99%) could be achieved at pH 12, MgO dose 0.5 g, ozonation time of 50 minutes and initial toluene concentration of 10 mg/l. The correlation coefficient (R 2 = 0.9480) indicates a good correlation between the experimental and predicted values. Conclusions:According to the results, COP is an efficient and rapid method for removing of toluene from aqueous solutions.

Toxicity of Malathion and Diazinon Byproducts Generated Through the UV/Nano-Zn Process

“…However, researchers showed that other AOPs can also be efficient and rapid. In this regard, most recent studies presented heterogeneous catalytic ozonation using nano-MgO for toluene removal (29) and UV/nano-CuO for textile wastewater treatment (30). In another study, Kamani et al reported photocatalyst decolorization of C. I. Sulphur Red 14 from solutions by UV/nano-ZnO (31).…”

Optimization of the photocatalytic degradation of phenol using superparamagnetic iron oxide (Fe3O4) nanoparticles in aqueous solutions

“…RSM is a popular experimental approach used in various industrial processes and chemical reactions to operate the process more economically and reliably to ensure greater stability and produce high-quality products. 51,52…”

“…RSM is a popular experimental approach used in various industrial processes and chemical reactions to operate the process more economically and reliably to ensure greater stability and produce high-quality products. 51,52 Whenever multiple input variables can affect the performance metrics of the process, it is possible to use RSM to evaluate the relationship between process performance metrics (responses) and input variables (independent variables) and to identify optimal conditions for the involved processes. In the present work, we selected a face-centered central composite (CCD) design, as a commonly employed type of RSM, to optimize the phenol photocatalytic degradation by SPIONs.…”

Research progress on toxicity, function, and mechanism of metal oxide nanoparticles on vascular endothelial cells

“…Magnesium oxide is considered to be environmentally friendly, nontoxic, and economical. It can also be used as a heterogeneous catalyst and as an effective destructive chemical adsorbent in the treatment of toxic gases and wastewater (Chintareddy & Kantam, 2011; Mohammadi, Bazrafshan, Noroozifar, & Ansari‐Moghaddam, 2016). Magnesium oxide is also used in antacids, antidote, biomolecular testing, and diagnosis (Kaur et al, 2018).…”