Intensification of ozone generation and degradation of azo dye in non-thermal hybrid corona-DBD plasma micro-reactor

Hafeez, Ainy; Javed, Fahed; Fazal, Tahir; Shezad, Nasir; Rehman, Muhammad Saif Ur; Rehman, Fahad

doi:10.1016/j.cep.2020.108205

Cited by 35 publications

(7 citation statements)

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“…Cold plasma has wide range of uses, including surface modification of plastics [34,35], ozone generation [36,37], toxic and harmful gas and sewage decomposition [38][39][40], as well as sterilization of soil and wounds [41][42][43]. Plasma complexity with its wide range of chemically active species also have a pronounced antimicrobial effect and can be used for surface decontamination [29,[44][45][46], and for reducing the detrimental effect of microorganisms in the food processing industry [47,48] and agriculture [19,49,50].…”

Section: Plasma Basics and Its Potential In Agriculturementioning

confidence: 99%

Can Cold Plasma Be Used for Boosting Plant Growth and Plant Protection in Sustainable Plant Production?

et al. 2022

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Sustainable agriculture with low inputs of chemicals and fertilizers has been recently attracting more attention from producers and researchers in the EU. The main reason for such attention is The European Green Deal—the EU’s latest growth strategy concerning environmental degradation and climate change. One of its main components is the Farm to Fork strategy, which especially features the reduction in pesticide and mineral fertilizer application and also supports the development of organic farming. At the same time, food demand is rising. These ambitious challenges require extensive research, development and innovation. Therefore, new non-chemical techniques for improving plant growth and resistance to biotic and abiotic stresses must be explored for their potential in this field. One of the most promising is the use of non-thermal plasma for such purposes. As this physical factor is a complex mixture of ions, atoms, electrons, radicals and molecules, its effect on plants and pathogens is also complex. This review presents different aspects of the effect of non-thermal plasma on seed germination, development of seedlings, plants and pathogens. The literature was explored to provide evidence for the possible use of non-thermal plasma for boosting plant growth and plant protection.

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Section: Plasma Basics and Its Potential In Agriculturementioning

confidence: 99%

Can Cold Plasma Be Used for Boosting Plant Growth and Plant Protection in Sustainable Plant Production?

et al. 2022

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“…During oxygen-source plasma discharge, O 3 was mainly produced through reactions (8) to (9). Oxygen molecules in the DBD system were decomposed into oxygen atoms through collision reactions of highenergy electrons in reaction (8) and then underwent a three-body collision process in reaction (9) to synthesize ozone.…”

Section: Discussionmentioning

confidence: 99%

Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

Shi,

Xie,

Cai

et al. 2023

Plasma Chem Plasma Process

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Dielectric barrier discharge (DBD), a non-thermal plasma(NTP)technology, has a wide range of environmental applications. In this study, TiO 2 , SiO 2 , and Al 2 O 3 were coated on the surface of a quartz dielectric using a dip-coating method. The catalyst coating coatings effectively improved the local discharge intensity, thus enhancing the generation of reactive species. After discharge by the DBD system, the O atom in the middle of TiO 2 crystal is replaced by N atom doping, and the Al = O and Al OH groups on the surface of Al 2 O 3 increase. All Catalyst coating surfaces contained a small number of hydroxyl groups. TiO 2 and Al 2 O 3 surfaces had fewer oxygen vacancies. thus making O 3 synthesis dominant at the gas-solid interface.1 Introduction Dielectric barrier discharge (DBD) is a non-equilibrium gas discharge generated by placing a dielectric barrier between two electrodes. The dielectric material can be coated on the electrode surfaces or suspended within the discharge space. DBD is a reliable and cost-effective method for generating nonthermal plasma (NTP). It can be operated over a wide range of voltage frequencies (from 50 Hz to 1 MHz, alternating current) and gas pressures (from 10 4 Pa to 10 6 Pa). As a result, DBD has a wide range of applications in various elds, including material modi cation, wastewater treatment, medical treatments, and industrial production [1][2][3] . Studies have demonstrated that the synthesis of ozone in the generator can be effectively enhanced by coupling DBD with catalysts [4,5] .One of the main methods of coupling DBD with catalysts is by lling the discharge region of the DBD generator with spherical or irregularly shaped dielectric particles, forming a packed-bed dielectric barrier discharge (PB-DBD) [6][7][8] . Hafeez et al. [9]investigated a novel corona PB-DBD generator by lling the discharge region with dielectric glass beads and compared its ozone synthesis performance with an empty-bed generator. The results showed that the packed-bed plasma generator increases ozone production by approximately 24% under optimized conditions compared with the empty-bed generator. J.Wang et al. [10] lled the generator with metal oxide powders as catalysts and study the effects of catalyst powders on O 3 synthesis and decomposition.. The results showed that FeO, CuO, and ZnO can effectively promote O 3 synthesis whereas MnO 2 and Fe 2 O 3 promoted ozone decomposition rather than synthesis. Meng Li et al. [11] integrated ZnO powder into a hybrid discharge (HD) reactor to investigate the effect of ZnO powder surface reaction on ozone synthesis. The results show that the use of ZnO powder for the optimal conditions with a discharge power of 0.4-3.3 W leads to an average increase of 28% and 26% in O 3 concentration and HD yield, respectively, and the enhanced O 3 synthesis in HD-ZnO is mainly attributed to the strong surface reaction catalyzed by the coating in the O2 plasma. S. Said et al. [12] lled alumina particles into the generator to study the reaction mechanism of ozone synthes...

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“…Since a constant ozone dose was applied in each batch experiment, a higher initial COD concentration resulted in a decrease in the ratio of ozone to organic molecules in solution leading to insufficient ozone to oxidize the organic molecules. Hafeez et al [33] reported that higher ozone flow enhanced color removal, but our experiments were limited to the ozone generator that operates at a fixed flow rate of air (3.37 ± 0.13 L/min).…”

Section: Effect Of Initial Cod Concentration Of the Used Boric Acid-b...mentioning

confidence: 99%

Decolorization of Boron-Based Wood Preservatives by Ozonation for Recycling: Optimization of Process Parameters

Yanchimpee

Thawornchaisit²

2022

Trends Sci

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Preservation of sawn timber from rubber trees with a water-soluble mixture of boric acid and borax generates a large quantity of colored wood preservative solutions and carries toxic metals, especially boron. To save costs, millers commonly reuse the colored mixtures in successive preservation cycles but regularly add boric acid and borax to maintain boron levels. However, this strategy affects both the color and the economic value of the treated wood. This paper presents a new strategy to treat the colored mixture of waterborne preservative solutions using ozonation for recycling purposes. At optimum conditions which are determined by response surface methodology, very high color removal (96 - 97 %) is achieved from ozone treatment of the wood preservatives with an initial COD concentration of 2,250 ± 40 mg/L and solution pH of 3.59 ± 0.02 for 65 min reaction time. The effluent can be reused in successive preservation cycles without degrading the wood quality in terms of the color of the processed timber and boron penetration in the end grain as well as the sides of the wood. Ozone treatment shows to be a promising color removal technology for sawn rubberwood industry, aimed at the reuse of waterborne preservatives, resulting in direct environmental and economic benefits. HIGHLIGHTS Application of ozone (O3) can be a clean technology to treat the color of aqueous solutions for in-process recycling in sawn rubberwood industry Box-Behnken design and Response Surface Methodology applied to find the optimum conditions for color removal from the mixture of boric acid and borax Recycling the mixture of boric acid and borax in a subsequent wood preservation operation gave very promising results The reusability of boron-based wood preservative solutions after ozonation minimizes the occurrence of industrial chemical waste GRAPHICAL ABSTRACT

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Intensification of ozone generation and degradation of azo dye in non-thermal hybrid corona-DBD plasma micro-reactor

Cited by 35 publications

References 47 publications

Can Cold Plasma Be Used for Boosting Plant Growth and Plant Protection in Sustainable Plant Production?

Can Cold Plasma Be Used for Boosting Plant Growth and Plant Protection in Sustainable Plant Production?

Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

Decolorization of Boron-Based Wood Preservatives by Ozonation for Recycling: Optimization of Process Parameters

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