Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol

Nawaz, Faheem; Cao, Hongbin; Xie, Yongbing; Xiao, Jiadong; Chen, Yue; Ghazi, Zahid Ali

doi:10.1016/j.chemosphere.2016.11.138

Cited by 176 publications

(72 citation statements)

References 46 publications

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“…Hence, in the present study, a catalyst concentration of 4 mg/L was considered as the optimal value. Similar results were reported by other studies that have used the COP to remove resistant contaminants (43,44). As mentioned before, the wastewater under treatment contained various pesticides including confidor, paraquat, glyphosites, and abamectin.…”

Section: Discussionsupporting

confidence: 88%

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Ghahrchi

Bazrafshan

Badan

et al. 2020

Environ Health Eng Manag

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Background: The discharge of untreated wastewater containing toxic and resistant compounds into the environment is a serious threat for ecosystems. Therefore, this study was conducted to evaluate the treatment of poison production factory wastewater using heterogeneous catalytic ozonation process (COP). Methods: Magnetic carbon nanocomposite was used as a catalyst at concentrations of 1, 2, and 4 g/L. Its effect on improving the treatment process was evaluated at reaction time of 30, 60, 90, and 120 minutes. At the end of each experiment, parameters including total organic carbon (TOC), chemical oxygen demand (COD), biological oxygen demand (BOD5 ), pH, electrical conductivity (EC), and turbidity were measured. Results: It was revealed that in single ozonation process (SOP), the maximum removal efficiencies of TOC, COD, and BOD5 were achieved at reaction time of 120 minutes as 56%, 40%, and 11.7%, respectively. By adding the catalyst to the wastewater, the treatment process was improved, so that the maximum removal efficiencies of COD (91%), TOC (73%), and BOD5 (74%) were obtained at catalyst concentration of 4 g/L. Under this condition, BOD5 /COD ratio increased from 0.22 to 0.64. Also, the results of analysis of ozone consumption per each mg of reduced COD showed that its amount sharply decreased from 2.1 mgO3 / mg COD removal in the SOP, to 0.34 mgO3 /mg COD removal in the COP. The results of kinetic reaction analysis also revealed that the rate constant increased from 0.007 to 0.02 min-1. Conclusion: According to the results, it can be concluded that the COP at a catalyst concentration of 4 g/L, by decomposing resistant compounds and increasing the biodegradability, can be used as a suitable pretreatment method for biological processes.

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Section: Discussionsupporting

confidence: 88%

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Ghahrchi

Bazrafshan

Badan

et al. 2020

Environ Health Eng Manag

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“…8 Manganese oxide is among the most widely studied metal oxides as an ozonation catalyst because of its unique characteristics, such as environmental friendliness, diverse crystallographic structure, facile fabrication, and abundance in soil. [12][13][14] As demonstrated in this study, manganese oxide supported by various porous materials (carbonbased multi-pore materials, 15,16 honeycomb ceramics, 17 and mesoporous molecular sieve 18 ) can effectively enhance mechanical performance and provide more catalytic active sites. In addition, porous materials supported by manganese oxide can be easily separated, avoiding the waste of catalyst and secondary pollution.…”

Section: Introductionmentioning

confidence: 79%

Heterogeneous catalytic ozonation of ciprofloxacin in aqueous solution using a manganese-modified silicate ore

Luo

Zou

et al. 2018

RSC Adv.

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“…However, the in-depth insights into the contribution of these potential active sites within rGO to the catalytic ozonation still remain unveiled. On the other hand, the agreement of the dominant reactive species for different organic pollutants mineralization has not been reached [17][18][19]. Recently, non-hydroxyl radical dependent pollutants degradation pathways were discovered for phenolic pollutants degradation [4,19,20].…”

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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Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol

Cited by 176 publications

References 46 publications

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Application of heterogeneous catalytic ozonation process for treatment of high toxic effluent from a pesticide manufacturing plant

Heterogeneous catalytic ozonation of ciprofloxacin in aqueous solution using a manganese-modified silicate ore

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

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