Catalytic ozonation of quinoline using nano-MgO: Efficacy, pathways, mechanisms and its application to real biologically pretreated coal gasification wastewater

Catalytic ozonation is believed to belong to advanced oxidation processes (AOPs). Over the past decades, heterogeneous catalytic ozonation has received remarkable attention as an effective process for the degradation of refractory organics in wastewater, which can overcome some disadvantages of ozonation alone. Metal oxides, metals, and metal oxides supported on oxides, minerals modified with metals, and carbon materials are widely used as catalysts in heterogeneous catalytic ozonation processes due to their excellent catalytic ability. An understanding of the application can provide theoretical support for selecting suitable catalysts aimed at different kinds of wastewater to obtain higher pollutant removal efficiency. Therefore, the main objective of this review article is to provide a summary of the accomplishments concerning catalytic ozonation to point to the major directions for choosing the catalysts in catalytic ozonation in the future.

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“…The results showed the small adsorption could be neglected. Detailed proposed mechanisms in this experiment are revealed in Figure 7 [102].…”

Section: Magnesium Oxidementioning

confidence: 94%

“…Zhu et al [102] studied the catalytic activity of the nano-MgO catalyst for the degradation of quinoline present in the biologically pretreated coal gasification wastewater. Under the same conditions, they found that 90.7% of quinoline was removed after 15 min.…”

Section: Magnesium Oxidementioning

confidence: 99%

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

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“…19,23 Thus, herein, a new hybrid catalyst was synthesized via the combination of three materials in three steps: mixing, sintering, and granulation. In this work, nano-MgO, which was previously found to be effective in the degradation of refractory organic pollutants 19,20,24,25 due to its high activity, 26,27 chemical stability, 25,26 and environmental friendliness, 19,28,29 was selected as the main part of the new catalyst. Graphite (Gr) was used as a catalyst support and provided catalyst reinforcement and porosity.…”

Section: Introductionmentioning

confidence: 99%

The catalytic ozonation of diazinon using nano-MgO@CNT@Gr as a new heterogenous catalyst: the optimization of effective factors by response surface methodology

et al. 2020

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“…Wastewater discharged from pesticide, pharmaceutical, and chemical industries usually contain a discernable amount of refractory organic N-heterocycles, of which quinoline is a typical example that is known to be carcinogenic, teratogenic, and mutagenic [1][2][3][4]. Quinoline is generally thermally stable, and with a strong electronegative N-atom in its heterocycle, it is more water-soluble and diffusive [5,6].…”

Section: Introductionmentioning

confidence: 99%

Improved Removal of Quinoline from Wastewater Using Coke Powder with Inorganic Ions

Wang

Gao

et al. 2020

Processes

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In this paper, laboratory batch adsorption tests were performed to study the adsorption behavior of coke powder in a quinoline aqueous solution with the absence and presence of inorganic ions (K+ and Ca2+). Adsorption isotherms, thermodynamic parameters, and kinetic models were used to understand the sorption mechanism, and zeta potential measurements were performed to elucidate the effect of the inorganic ions on the adsorption. The results showed that coke powder exhibited a reasonably good adsorption performance due to its pore structure and surface characteristics, and the presence of K+ and Ca2+ could further improve the adsorption. Without inorganic ions, the adsorption capacity of coke powder for quinoline and the removal efficiency of quinoline were 1.27 mg/g and 84.90%, respectively. At the ion concentration of 15 mmol, the adsorption capacity of coke powder and quinoline removal efficiency in the presence of K+ reached 1.38 mg/g and 92.02%, respectively, whereas those in the solutions with Ca2+ reached 1.40 mg/g and 93.31%, respectively. It was found that the adsorption of quinoline onto coke powder in the absence and presence of inorganic ions fit the Freundlich isotherm. Changes in the Gibbs free energy, the heat of adsorption, the entropy, and the activation energy of adsorption suggest that the adsorption was spontaneous and exothermic, which was dominated by physical adsorption, and that the added K+ and Ca2+ would favor the adsorption. In addition, the pseudo-second-order kinetic model was found to provide the best fit to the adsorption kinetic data, and K+ and Ca2+ increased the rate of quinoline adsorbed onto coke power. This improved adsorption due to inorganic ions was found to be a consequence of the decrease in the surface potential of coke powder particles, which resulted in a reduced thickness of water film around particles, as well as a decreased electrostatic repulsion between coke powder particles and quinoline molecules.

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Catalytic ozonation of quinoline using nano-MgO: Efficacy, pathways, mechanisms and its application to real biologically pretreated coal gasification wastewater

Cited by 138 publications

References 51 publications

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

The catalytic ozonation of diazinon using nano-MgO@CNT@Gr as a new heterogenous catalyst: the optimization of effective factors by response surface methodology

Improved Removal of Quinoline from Wastewater Using Coke Powder with Inorganic Ions

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