Development, dilemma and potential strategies for the application of nanocatalysts in wastewater catalytic ozonation: A review

Jin, Xiaoguang; Wu, Changyong; Tian, Xiangmiao; Wang, Panxin; Zhou, Yuexi; Zuo, Jiane

doi:10.1016/j.jes.2021.09.041

Cited by 42 publications

(13 citation statements)

References 174 publications

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“…Nanomaterials have been coupled with ozone (catalytic ozonation) to eliminate or reduce the number of chemical substances involved in these treatments while increasing the pollutant degradation yields and reducing environmental impacts [ 10 , 11 , 12 , 13 ]. Taking into consideration natural resources, environmental sustainability and toxicity issues, carbon-based nanomaterials are preferred to metallic/semi-metallic materials in real-world applications [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Cardoso

Silva

et al. 2022

Nanomaterials

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A catalytic ozonation advanced oxidation process (AOP) with a copper(II)-doped carbon dot as catalyst, Cu-CD (using L-cysteine and polyethylene glycol (PEG) as precursors and passivation agents), was developed for textile wastewater treatment (T = 25 °C and pH = 7). Four dyes were analyzed—Methyl Orange (MO), Orange II sodium salt (O-II), Reactive Black 5 (RB-5) and Remazol Brilliant Blue R (RBB-R), as well as a real effluent from the dying and printing industry. The Cu-CD, with marked catalytic ozonation properties, was successfully synthesized by one-pot hydrothermal procedure with a size of 4.0 nm, a charge of −3.7 mV and a fluorescent quantum yield of 31%. The discoloration of the aqueous dye solutions followed an apparent first-order kinetics with the following rate constants (kap in min−1): MO, 0.210; O-II, 0.133; RB-5, 0.177; RBB-R, 0.086. In the presence of Cu-CD, the following apparent first-order rate constants were obtained (kapc in min−1) with the corresponding increase in the rate constant without catalyst (%Inc): MO, 1.184 (464%); O-II, 1.002 (653%); RB-5, 0.709 (301%); RBB-R, 0.230 (167%). The presence of sodium chloride (at a concentration of 50 g/L) resulted in a marked increase of the discoloration rate of the dye solution due to generation of other radicals, such as chlorine and chlorine oxide, resulting from the reaction of ozone and chloride. Taking into consideration that the real textile effluent under research has a high carbonate concentration (>356 mg/L), which inhibits ozone decomposition, the discoloration first-order rate constants without and with Cu-CD (kap = 0.0097 min−1 and kapc = 0.012 min−1 (%Inc = 24%), respectively) were relatively small. Apparently, the Cu-CD, the surface of which is covered by a soft and highly hydrated caramelized PEG coating, accelerates the ozone decomposition and dye adsorption, increasing its degradation.

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Section: Introductionmentioning

confidence: 99%

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Cardoso

Silva

et al. 2022

Nanomaterials

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“…By contrast, O 3 degrades organic pollutants through reacting with organic compounds containing unsaturated bonds or receiving electrons to replace some functional groups of organic pollutants [32]. Compared with ozone oxidation, a much higher amount of small molecular organic acids was generated in the Fenton oxidation process according to the GC-MS results, which could be attributed to the fact that O 3 was a highly selective oxidant, which made it difficult to degrade organic pollutants without electron-rich fraction [33,34]. On the other hand, the generated • OH can attack macromolecular organic pollutants non-selectively.…”

Section: Biodegradability Improvement Analysismentioning

confidence: 99%

Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism

et al. 2022

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Cost-effective pretreatment of highly concentrated and bio-refractory petrochemical wastewater to improve biodegradability is of significant importance, but remains challenging. This study compared the pretreatment of petrochemical wastewater by two commonly used chemical advanced oxidation technologies (Fenton and ozone oxidation), and the mechanisms of biodegradability improvement of pretreated wastewater were explored. The obtained results showed that in the Fenton oxidation system, the COD removal of petrochemical wastewater was 89.8%, BOD5 decreased from 303.66 mg/L to 155.49 mg/L, and BOD5/COD (B/C) increased from 0.052 to 0.62 after 60 min under the condition of 120 mg/L Fe2+ and 500 mg/L H2O2, with a treatment cost of about 1.78 $/kgCOD. In the ozone oxidation system, the COD removal of petrochemical wastewater was 59.4%, BOD5 increased from 127.86 mg/L to 409.28 mg/L, and B/C increased from 0.052 to 0.41 after 60 min at an ozone flow rate of 80 mL/min with a treatment cost of approximately 1.96 $/kgCOD. The petrochemical wastewater treated by both processes meets biodegradable standards. The GC–MS analysis suggested that some refractory pollutants could be effectively removed by ozone oxidation, but these pollutants could be effectively degraded by hydroxyl radicals (•OH) produced by the Fenton reaction. In summary, compared with ozone oxidation, petrochemical wastewater pretreated with Fenton oxidation had high COD removal efficiency and biodegradability, and the treatment cost of Fenton oxidation was also lower than that of ozone oxidation.

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“…Optimization of ozonation parameters and application of catalysts can enhance the effectiveness of the ozonation process. Application of various catalysts have been reported in the catalytic ozonation process; such as electrochemically generated Fe 2+ (Heebner & Abbassi, 2022), Ce-MCM-48 (Li et al, 2015), nanocatalysts (Jin et al, 2023), CaO (Zhou et al, 2023), Mn-loaded C-SiO2 (Chen et al, 2023), and aluminum chloride and alum (Rizvi et al, 2022), among others. The most important influential parameters on the ozonation process and the schematic diagram of the ozonation are presented in Table 3 and Figure 1, respectively.…”

Section: Introductionmentioning

confidence: 99%

Transformation of Traditional Wastewater Treatment Methods into Advanced Oxidation Processes and the Role of Ozonation

Nikbeen¹,

Nayab²

2023

J. Ecol. Eng.

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Technology advancement improves the quality of life, however, it might also introduce new pollutants to the ecosystem, which needs to deal with for the goal of a sustainable ecosystem. Municipal and industrial wastewater has always been important in improving the quality of life while maintaining the sustainability of our planet simultaneously. The diversity of pollutants in wastewater requires more advanced and demanding treatment processes. The ozonation, as a crucial part of the advanced oxidation processes, is a superior oxidation method compared to traditional oxidation methods. After the recognition of ozone as GRAS (generally recognized as safe), its applications have diversified and is used currently for microbial inactivation, degradation of recalcitrant organic compounds, removal of a diverse range of micropollutants, solubilization and reduction of sludge, and removal of color and odor components in wastewaters treatment processes. However, some considerable challenges still exist towards its universal application, such as high ozone generation costs, diversity of pollutants, and formation of ozonation by-products, which still require further studies. The main theme of this review paper is the transformation of traditional oxidation methods into advanced oxidation processes and the role of ozonation in this regard, including its applications, by-products, and its comparison with the traditional oxidation methods and advanced oxidation processes.

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Development, dilemma and potential strategies for the application of nanocatalysts in wastewater catalytic ozonation: A review

Cited by 42 publications

References 174 publications

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism

Transformation of Traditional Wastewater Treatment Methods into Advanced Oxidation Processes and the Role of Ozonation

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