Catalytic ozonation of 4-nitrophenol over an mesoporous α-MnO2 with resistance to leaching

Nawaz, Faheem; Xie, Yongbing; Cao, Hongbin; Xiao, Jiadong; YueqiuWang,; Zhang, Xihua; Li, Mingjie; Duan, Feng

doi:10.1016/j.cattod.2015.03.044

Cited by 95 publications

(32 citation statements)

References 38 publications

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“…Previous researchers reported [40] that commercial MnO 2 was not active in catalytic ozonation, but Luo et al [41] reported that commercial MnO 2 had a catalytic effect on the degradation of Bisphenol A, but it played a certain inhibiting effect in the degradation of ibuprofen. The same result had been observed by Nawaz et al [42] for the catalytic ozonation of 4-nitrophenol. was the most active among the three catalysts because of its higher surface hydroxyl groups and higher electron transfer ability.…”

Section: Manganese Oxidesupporting

confidence: 87%

“…Nawaz et al [42] investigated the catalytic ozonation of 4-nitrophenol (4-NP) using α-MnO 2 and found that superoxide radicals, rather than hydroxyl radicals, make a great contribution to the degradation of 4-NP. An ozone molecule attached with α-MnO 2 on its active sites detaches with another ozone molecule to produce oxygen and superoxide free radicals [50,51].…”

Section: Manganese Oxidementioning

confidence: 99%

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Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

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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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Section: Manganese Oxidesupporting

confidence: 87%

Section: Manganese Oxidementioning

confidence: 99%

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

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“…Metal-based catalysts have been proved to be highly reactive in catalytic ozonation, however, the deactivation by metal leaching cannot be fully avoided [10]. To construct a sustainable future, the emerging carbon-based materials, especially nanocarbons, have been developed as the state-of-the-art alternatives to the metal-based materials for environmental catalysis due to their exceptional physico-chemical properties, no heavy metal leaching and environmental friendliness [5,[11][12][13][14][15].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Tailored synthesis of active reduced graphene oxides from waste graphite: Structural defects and pollutant-dependent reactive radicals in aqueous organics decontamination

Wang

Chen

et al. 2018

Applied Catalysis B: Environmental

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145

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“…In the presence of NaF, the reaction rate decreased by factors of 1.4 and 1.7 for 1,4-dioxane and TOC, respectively, suggesting that • OHads had a stronger influence in the degradation of the intermediate products. In contrast, in the presence of PBQ, a superoxide radical (O2 -• ) scavenger [59,60], the reaction rate decreased by a factor of 2.7, indicating that 1,4dioxane was mainly degraded by O2 -• .…”

Section: Radical Species and Reaction Mechanismmentioning

confidence: 99%

Treatment of aqueous solutions of 1,4-dioxane by ozonation and catalytic ozonation with copper oxide (CuO)

Scaratti

Basso

Landers

et al. 2018

Environmental Technology

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In this study, treatment for the removal of 1,4-dioxane by ozone and by catalytic ozonation using CuO as the catalyst was investigated. While the removal of 1,4-dioxane was small (20%) and mineralization negligible after 6 h of ozonation treatment, the removals of 1,4-dioxane and total organic carbon increased by factors of 10.35 and 81.25, respectively, after catalytic ozonation in the presence of CuO. The mineralization during catalytic ozonation was favored at pH 10 (94.91 min -1 ), although it proceeded even at pH 3 (54.41 min -1 ). The CuO catalyst decreased the equilibrium concentration of soluble ozone and favored its decomposition to reactive oxidative species. Radical scavenging experiments demonstrated that superoxide radicals were the main species responsible for the degradation of 1,4-dioxane. Further scavenging experiments with phosphate confirmed the presence of Lewis active sites on the surface of CuO, which were responsible for the adsorption and decomposition of ozone. The reaction mechanism proceeded through the formation of ethylene glycol diformate, which quickly hydrolyzed to ethylene glycol and formic acid as intermediate products. The stability of CuO indicated weak copper leaching and high catalytic activity for five recycling cycles. The toxicity of the water, assessed by Vibrio fischeri bioluminescence assays, remained the same (low toxicity) after catalytic ozonation while it increased after treatment with ozonation alone.

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Catalytic ozonation of 4-nitrophenol over an mesoporous α-MnO2 with resistance to leaching

Cited by 95 publications

References 38 publications

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Tailored synthesis of active reduced graphene oxides from waste graphite: Structural defects and pollutant-dependent reactive radicals in aqueous organics decontamination

Treatment of aqueous solutions of 1,4-dioxane by ozonation and catalytic ozonation with copper oxide (CuO)

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