Combinatorial effects of non-thermal plasma oxidation processes and photocatalytic activity on the inactivation of bacteria and degradation of toxic compounds in wastewater

Raji, A.; Vasu, Dhanapal; Pandiyaraj, K. Navaneetha; Ghobeira, Rouba; Morent, Rino; Misra, Vandana Chaturvedi; Ghorui, S.; Pichumani, Moorthi; Deshmukh, R.R.; Nadagouda, Mallikarjuna N.

doi:10.1039/d1ra09337a

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…The formation of copper oxides can be attributed to the ionized oxygen-containing species with high oxidation ability in O 2 plasma, as confirmed by optical emission spectra (OES) monitoring (Figure S5, Supporting Information). [37][38][39] The formation of three-layered structure is resulted from the depth-dependent processing merit of low-temperature plasma technique. As the top layer is fully oxidized, it is dominated by CuO phase.…”

Section: Resultsmentioning

confidence: 99%

Metastable Phase Cu with Optimized Local Electronic State for Efficient Electrocatalytic Production of Ammonia from Nitrate

Wang

Yan

Sun

et al. 2022

Adv Funct Materials

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Electrocatalytic nitrate (NO 3 − ) reduction reaction (NITRR) is an inspiring route for ammonia (NH 3 ) synthesis at ambient condition. The metallic Cubased material with low cost and high activity is one of the most promising electrocatalysts for NITRR. However, due to the weaker atomic H * -providing capacity, the produced intermediate-nitrite tends to accumulate on its surface, leading to unsatisfactory NH 3 selectivity and Faradic efficiency (FE). Herein, a novel and facile O 2 /Ar plasma oxidation and subsequent electroreduction strategy is developed to synthesize a kind of metastable phase Cu. Excitingly, the metastable phase Cu demonstrates superior NITRR performance to conventional phase Cu with high NH 4 + selectivity (97.8%) and FE (99.8%). Density function theory (DFT) calculations reveal that the upshift of the d-band center to near the Fermi level in metastable phase Cu contributes to the enhanced activity, while the relatively strong adsorption of H * facilitates the conversion from NO 2 * /NO * to NOOH * /NOH * and thus ensures high selectivity and FE. Furthermore, when evaluated as cathode material in Zn-NO 3 − battery, high power density (7.56 mW cm −2 ) and NH 4 + yield (76 µmol h −1 cm −2 ) are achieved by the metastable phase Cu-based battery.

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Section: Resultsmentioning

confidence: 99%

Metastable Phase Cu with Optimized Local Electronic State for Efficient Electrocatalytic Production of Ammonia from Nitrate

Wang

Yan

Sun

et al. 2022

Adv Funct Materials

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“…(4). Hydroxyl radicals function as exceptionally potent oxidants in aqueous settings, according to reports in the literature [91][92]. As a result, the reactant can be openly oxidized by the hydroxyl radicals to produce other safe products Eq.…”

Section: Mechanismof Photocatalytic Degradationmentioning

confidence: 99%

A review of new developments in the synthesis of CuO nanoparticles via plant extracts for enhancing the photocatalytic activity

Thakur,

Kumar,

Thakur

et al. 2022

Biomat Polymers Horizon

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Metal and metal oxide nanoparticles are used widely in a variety of fields of science, research organizations, and industry sectors due to recent advancements in nanoscience and nanotechnologies. Due to their exclusive its unique characteristics and uses, copper oxide nanoparticles (CuO NPs) have drawn more attention than further other metal oxides. The expensive components reagents, equipment, and environmental hazards and risks connected to the physical and chemical processes of CuO NPs synthesis have been a major cause for concern. This review main features of a collection of thorough data from the latest advancements in the synthesis, characterization, and applications from prior research studies on the biological method of synthesizing CuO NPs in the sample order to puffer a solution to the given aforementioned techniques by aiming to reduce reducing environmental pollution and producing inexpensive cheaper nanoparticles with effective characteristics. CuO NPs demonstrated astounding photocatalytic efficiency against the degradation of industrial waste dye. For the photocatalytic destruction of organic contaminants, CuO NPs have high prospective applications. This review study provides additional information on the use of CuO photocatalysts, which are low-cost and environmentally acceptable, to efficiently remove hazardous colors from industrial wastewater. This investigation also provides useful and informative knowledge on the instant synthesis of CuO NPs from plant extracts with desired properties.

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“…For effective disinfection of large indoor spaces, there remains a need for better technology that eliminates the various disadvantages associated with the existing technologies. Atmospheric pressure plasmas (APPs) has recently gained more attention due to its broad range of applications, such as in the fundamental investigation of plasma sterilization [15][16][17][18][19][20][21][22], cell and polymer treatments [23][24][25][26], and degradation of organic pollutants in air and water [27,28].…”

Section: Introductionmentioning

confidence: 99%

Indoor air disinfection by non thermal atmospheric pressure plasma: a comparative study of performance in low and high humidity environments

Jangra,

Ahlawat,

Mohan

et al. 2024

Phys. Scr.

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Atmospheric pressure plasma (APP) has intrigued the interest of researchers for various applications such as disinfection, air purification, etc. In this context, a deeper understanding of the correlation between APP’s characteristics like discharge parameters, active species composition, and eradication of airborne microorganisms with varying relative humidity (RH) has been examined using a dielectric barrier discharge based atmospheric pressure plasma (DBD-APP) source. One of the electrodes of the developed DBD-APP source has been coated with TiO2 nanoparticles to enhance the generation of reactive species during the discharge process. The results show that, even with the same peak-to-peak applied voltage, the peak-to-peak current and discharge power decrease with increasing RH. Optical emission spectroscopy (OES) is used to determine the relative emission intensity of the reactive species, whereas spectrophotometry is used to quantify the reactive species produced by the plasma at various parameters. Instead of UV radiation, the plasma-produced highly energetic electrons activates the TiO2 nanoparticles for electron-hole pair generation. The geometry of the discharge has played an important role in generating high energy electrons. From the developed DBD-APP source, the airborne microorganism’s disinfection efficiency of ~ 95.8% and ~ 98.7% has been achieved in the total bacterial counts (TBCs) and total fungal counts (TFCs) at an RH range of 70% – 90%, in just 20 minutes of continuous operation. However, in the RH range of 20% – 40%, the inactivation efficiency dropped to ~ 78.8% and ~ 87.5% for the TBCs and TFCs, respectively. The outcome indicates that higher humidity levels are better for indoor air purification using DBD-APP sources and that plasma with a circulation system can effectively disinfect indoor environments.

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Combinatorial effects of non-thermal plasma oxidation processes and photocatalytic activity on the inactivation of bacteria and degradation of toxic compounds in wastewater

Abstract: Contamination of water is a serious issue across the world. The proposed plasma synergetic treat has great potential to treat contaminated water in an environmentally friendly way.

Cited by 7 publications

References 52 publications

Metastable Phase Cu with Optimized Local Electronic State for Efficient Electrocatalytic Production of Ammonia from Nitrate

Metastable Phase Cu with Optimized Local Electronic State for Efficient Electrocatalytic Production of Ammonia from Nitrate

A review of new developments in the synthesis of CuO nanoparticles via plant extracts for enhancing the photocatalytic activity

Indoor air disinfection by non thermal atmospheric pressure plasma: a comparative study of performance in low and high humidity environments

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