In-liquid Plasma. A stable light source for advanced oxidation processes in environmental remediation

Tsuchida, Akihiro; Shimamura, Takeshi; Sawada, Seiya; Sato, Susumu; Serpone, Nick; Horikoshi, Satoshi

doi:10.1016/j.radphyschem.2018.01.028

Cited by 15 publications

(7 citation statements)

References 19 publications

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“…Adanya perbedaan karakteristik warna plasma tersebut dapat dikaitkan dengan komposisi unsur kimia dari beberapa sampel cairan. S. Horikoshi dan N. Serpone telah meneliti emisi spektrum cahaya plasma dalam cairan yang mana dapat dikaitkan dengan beberapa unsur kimia seperti unsur radikal Hα (λ = 656 nm) Hβ(λ = 486 nm), dan OH radikal (λ = 316 nm) serta unsur nitrogen (Nβ) dan oksigen (O2) pada λ = 289 nm dan λ = 778 nm [10]- [12]. Selanjutnya tabulasi data disajikan pada tabel 1 berupa data dari hasil pengujian tersebut dapat dilihat pada tabel 1.…”

Section: Hasil Dan Pembahasanunclassified

Pembangkitan Microwave Plasma Dalam Berbagai Jenis Cairan

Nurdin

Putra²,

Amaliah³

2022

sinergi

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Teknologi pembangkitkan plasma dalam cairan dengan memanfaatkan gelombang elektromagnetik 2.45 GHz oven microwave telah dilakukan sebelumnya. Tujuan penelitian ini adalah untuk menganalisis pembangkitan microwave plasma dalam berbagai sampel cairan seperti cairan rontgen, pure water, air baku PDAM dan air laut. Hasil penelitian menunjukkan bahwa pembangkitan plasma dalam berbagai sampel cairan membutuhkan waktu awal pembangkitan sekitar 1-2 detik pada tekanan 6.7 kPa. Karakteristik warna plasma yang dihasilkan dalam cairan rontgen dan air laut adalah sama yakni orange, dan karakteristik warna plasma yang dihasilkan dalam pure water dan air baku PDAM adalah sama yakni pink.

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Section: Hasil Dan Pembahasanunclassified

Pembangkitan Microwave Plasma Dalam Berbagai Jenis Cairan

Nurdin

Putra²,

Amaliah³

2022

sinergi

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“…Nonetheless, in our previous study, 9 we succeeded in generating microwave-induced in-liquid-plasma (MILP) continuously under microwave pulsed oscillation conditions that precluded the accumulation of heat at the tip of the antenna electrode and thus avoid damaging the antenna. Accordingly, we were able to degrade fairly rapidly such pollutants as the persistent peruorooctanoic acid, 10 dyecontaminated wastewaters, 9 dioxane, 11 and the ame retardant tetrabromobisphenol-A in alkaline aqueous media. 12 The present study started from a completely unexpected discovery during an earlier study 13 in which our strategy was to synthesize silver nanoparticles using MILP to irradiate a 50 mL aqueous solution of silver nitrate for 5 min in the presence of polyvinyl pyrrolidone (PVP; a protective and reducing agent).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel green chemistry gelation method for polyvinyl pyrrolidone (PVP) and dimethylpolysiloxane (silicone): microwave-induced in-liquid-plasma

2021

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“…Unfortunately, while it was possible to continuous generate the in-liquid plasma; it was not possible to bring about improvements on the complex device. The second challenge resolved was that, in the absence of the supersonic horn and by reducing the pressure inside the reaction vessel with an aspirator, the irradiation power of the microwaves could be low significantly from 700 to 150 W [6]. Most importantly, the latter method led to the generation of stable, permanent in-liquid plasma.…”

Section: Introductionmentioning

confidence: 99%

“…Most importantly, the latter method led to the generation of stable, permanent in-liquid plasma. In order to advance the miniaturization of the device, we replaced the magnetron microwave generator used earlier [6] by a semiconductor microwave generator and discovered that, unlike the former, irradiation with 150-W microwaves no longer generated in-liquid plasma. Even if the microwave power increased to 300 W, no in-liquid plasma generated-a curious result that led us to query the causes that might explain these observations.…”

Section: Introductionmentioning

confidence: 99%

In-Liquid Plasma Using Microwave Power for Applications

Horikoshi

2019

Proceedings 17th International Conference on Microwave and High Frequency Heating

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More than 30 years have passed since Clements, et. al. succeeded in generating plasma in liquid (in-Liquid plasma: LP). Meanwhile, then plasma generation experiments using AC and DC power sources have been performed in electrolyte solutions. On the other hand, in 2000, by Nomura, et. al., they succeeded in generating plasma in aqueous solution by using microwave as a power source. When the microwave is used as a power source, there is a problem that the electrode is deteriorated and melted by the heat of plasma, and there is a problem that the device cannot be used continuously. We solved this problem using a semiconductor (solid-state) microwave generator. In order to investigate the possibility of using this new plasma, we have applied to wastewater treatment (e.g. degradation of 1,4-dioxane, rhodamine B dye and hypochlorous) and gel synthesis (polyvinylpyrrolidone (PVP) gel and silicone hydrogel gel). The photograph of the LP apparatus is illustrated in Figures 1. The MW generator was constructed using an Ampleon M2A-R semiconductor generator (2.45-GHz; maximal power, 1300 W) coupled to an isolator (air cooling device), a power monitor, a three-stub tuner and a short-circuit plunger. Microwaves continuously irradiated the liquid through the tungsten antenna (dia.: 10 mm; length: 200 mm). The tungsten antenna was isolated from the reactor and the waveguide using a ceramic spacer to irradiate MW in the solution. In the application of LP for wastewater treatment, the model wastewater of rhodamine B dye (RhB) were decomposed by LP irradiation, and degradation efficency of LP method was compared with conventional methods (UV photodegradation, NaClO chemical treatment, UV/NaClO chemical/photodegradation and the UV/TiO2 photocatalytic degradation method). The degradationon rate of LP method was remarkably fastest to conventional methods (Figure 2). In the application of LP for gel-synthesis, synthesizing the polymer-gel (PVP-gel and HySi-gel) was tried by the LP method. This feature of the method can significantly reduce (or eliminate) the initiator and crosslinking agent needed for conventional synthesis. Because these chemicals are very toxic, the LP approach is effective in green chemistry. In addition, it will further extend the application of these gels to the medical field.More than 30 years have passed since Clements, et. al. succeeded in generating plasma in liquid (in-Liquid plasma: LP) [1]. Meanwhile, then plasma generation experiments using AC and DC power sources have been performed in electrolyte solutions. On the other hand, in 2000, by Nomura, et. al., [1], they succeeded in generating plasma in aqueous solution by using microwave as a power source. When the microwave is used as a power source, there is a problem that the electrode is deteriorated and melted by the heat of plasma, and there is a problem that the device cannot be used continuously. We solved this problem using a semiconductor (solid-state) microwave generator [2]. In order to investigate the possibility of using this new plasma, we have applied to wastewater treatment (e.g. degradation of 1,4-dioxane, rhodamine B dye and hypochlorous) and gel synthesis (polyvinylpyrrolidone (PVP) gel and silicone hydrogel gel).More than 30 years have passed since Clements, et. al. succeeded in generating plasma in liquid (in-Liquid plasma: LP) [1]. Meanwhile, then plasma generation experiments using AC and DC power sources have been performed in electrolyte solutions. On the other hand, in 2000, by Nomura, et. al., [1], they succeeded in generating plasma in aqueous solution by using microwave as a power source. When the microwave is used as a power source, there is a problem that the electrode is deteriorated and melted by the heat of plasma, and there is a problem that the device cannot be used continuously. We solved this problem using a semiconductor (solid-state) microwave generator [2]. In order to investigate the possibility of using this new plasma, we have applied to wastewater treatment (e.g. degradation of 1,4-dioxane, rhodamine B dye and hypochlorous) and gel synthesis (polyvinylpyrrolidone (PVP) gel and silicone hydrogel gel).

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In-liquid Plasma. A stable light source for advanced oxidation processes in environmental remediation

Cited by 15 publications

References 19 publications

Pembangkitan Microwave Plasma Dalam Berbagai Jenis Cairan

Pembangkitan Microwave Plasma Dalam Berbagai Jenis Cairan

A novel green chemistry gelation method for polyvinyl pyrrolidone (PVP) and dimethylpolysiloxane (silicone): microwave-induced in-liquid-plasma

In-Liquid Plasma Using Microwave Power for Applications

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