Potential Application of Pin-to-Liquid Dielectric Barrier Discharge Structure in Decomposing Aqueous Phosphorus Compounds for Monitoring Water Quality

Abstract

Here, we proposed a pin-to-liquid dielectric barrier discharge (DBD) structure that used a water-containing vessel body as a dielectric barrier for the stable and effective treatment of aqueous solutions in an open atmosphere. To obtain an intense pin-to-liquid alternating current discharge using a dielectric barrier, discharge characteristics, including the area and shape of a ground-plate-type electrode, were investigated after filling the vessel with equivalent amounts of water. Consequently, as the area of the ground electrode increased, the discharge current became stronger, and its timing became faster. Moreover, we proposed that the pin-to-liquid DBD reactor could be used to decompose phosphorus compounds in water in the form of phosphate as a promising pretreatment method for monitoring total phosphorus in water. The decomposition of phosphorus compounds using the pin-to-liquid DBD reactor demonstrated excellent performance—comparable to the thermochemical pretreatment method—which could be a standard pretreatment method for decomposing phosphorus compounds in water.

Development of an Atmospheric Pressure Plasma Jet Device Using Four-Bore Tubing and Its Applications of In-Liquid Material Decomposition and Solution Plasma Polymerization

“…The absorption spectra in the visiblenear infrared region of the prepared phosphate standard solutions were recorded using a spectrometer (USB-4000 UV-vis, Ocean Optics Inc., Dunedin, FL, USA). Calibration curves for the standard solutions were plotted based on the absorbance characteristics at 710 nm [24,25]. The decomposition of the BGP solution into orthophosphate (PO 4 3− ) by plasma treatment was investigated comparatively based on these calibration curves.…”

“…Figure 6a depicts the absorption spectra in the visible-near infrared region of BGP solutions treated with in-liquid plasma as a function of plasma treatment time. Based on the ascorbic acid method [31], the amount of phosphate can be quantified by comparing the absorption of the prepared phosphate standard solution at 710 nm with that of the plasma-treated samples [24,32]. Figure 6b shows the results of the decomposition efficiency of the BGP samples into orthophosphate by in-liquid plasma according to treatment time, which indicates that most of the phosphorus compounds were degraded into phosphate after in-liquid plasma treatment using the APPJ device for 30 min.…”

Effects of Dielectric Barrier on Water Activation and Phosphorus Compound Digestion in Gas–Liquid Discharges

“…Additionally, metal GND electrodes immersed in liquids can have additional effects on these physical and chemical interactions. Because the liquid vessel of a PLD reactor is usually made of glass, acryl, or polypropylene, a pin–liquid barrier discharge (PLBD) can also be implemented using the bottom of the vessel as a dielectric barrier [ 26 ]. Based on the investigation of the effective PLBD generation, the PLBD reactor must be further studied to study the plasma stability, plasma byproduct generation in liquids, and the suitability of PLBD for use in wastewater treatment.…”

Removal of Pb(II), Cd(II) and Ni(II) Ions from Groundwater by Nonthermal Plasma

“…In the last few years, there has been increased interest in using plasma technology to reduce water pollution [ 35 ]. Currently, researches on using this technology mostly concern removing organic compounds from water and wastewater, including dyes [ 36 , 37 ], pharmaceuticals [ 38 , 39 ], phenol [ 40 ], methylene blue [ 41 ], phosphorous compounds [ 42 ] and microbes [ 43 ]. Plasma technologies can also be used to oxidize inorganic pollutants, but the number of articles on this application is small [ 23 , 44 ].…”