“…Microwave plasma in liquid is a new plasma technology and becomes more and more concerned due to its large spatial distribution and high density [11][12][13][14][15][16]. Microwave discharge in liquid can produce a lot of active particles such as OH, O, especially OH radicals which are among the strongest oxidizers can degrade pollutants efficiently.…”
Key words Microwave plasma, discharge in liquid, methylene blue, degradation rate.Microwave plasma in liquid is a new plasma technology and becomes more and more concerned due to its large spatial distribution and high density of plasma. In this paper, methylene blue is degraded using plasma which is generated by 2450 MHz microwave in liquid. Effects of microwave power, initial concentration and pH on the degradation rate of methylene blue are studied respectively. Results show that the degradation rate of methylene blue increases with increasing of microwave power, and decreases with increasing pH in the range of 6-8; When the initial concentration is less than 12.5 mg/L, the maximum degradation rate of methylene blue increases with increasing of its initial concentration, which can reach 96.56%. However, when the initial concentration is more than 12.5 mg/L, the maximum degradation rate appears decreased.
“…Microwave plasma in liquid is a new plasma technology and becomes more and more concerned due to its large spatial distribution and high density [11][12][13][14][15][16]. Microwave discharge in liquid can produce a lot of active particles such as OH, O, especially OH radicals which are among the strongest oxidizers can degrade pollutants efficiently.…”
Key words Microwave plasma, discharge in liquid, methylene blue, degradation rate.Microwave plasma in liquid is a new plasma technology and becomes more and more concerned due to its large spatial distribution and high density of plasma. In this paper, methylene blue is degraded using plasma which is generated by 2450 MHz microwave in liquid. Effects of microwave power, initial concentration and pH on the degradation rate of methylene blue are studied respectively. Results show that the degradation rate of methylene blue increases with increasing of microwave power, and decreases with increasing pH in the range of 6-8; When the initial concentration is less than 12.5 mg/L, the maximum degradation rate of methylene blue increases with increasing of its initial concentration, which can reach 96.56%. However, when the initial concentration is more than 12.5 mg/L, the maximum degradation rate appears decreased.
“…A few groups have recently reported the generation of silver nanoparticles in liquid using this method . However, the studies for mechanisms and generation of size‐controllable silver nanoparticles based on plasma–liquid interaction are still limited.…”
This paper presents a one‐step method for the rapid synthesis of colloidal silver nanoparticles (AgNPs) for bacterial disinfection. Silver ions were electrochemically reduced to silver atoms in an AgNO3 solution with the assistance of an atmospheric argon microplasma jet. Dextran was used to stabilize the AgNPs in the liquid solution. Ultraviolet–visible spectroscopy, transmission electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy were used to characterize the synthesized AgNPs. It was found that the size of the nanoparticles can be controlled by adjusting the dextran monomer/Ag+ molar ratio in the solution. Furthermore, antibacterial activity of the as‐synthesized AgNPs against Escherichia coli and Staphylococcus aureus was carried out in liquid as well as on solid growth media, as a function of the AgNPs concentration. The results showed that the AgNPs had a significant antibacterial activity against those bacteria cells and the minimum inhibition concentration was associated with the type of bacteria and initial bacterial concentration.
“…Recently a synthesis of metal nano-composites by plasma in liquid has been developed. The radio wavelength region (usually 13.56 MHz) has been used as the main source in the last decade 11 , but very recently microwave region (2.45 GHz) was newly used as more easily available source [12][13][14][15] . Plasma is easily produced with relatively small microwave equipment according to the high frequency of microwave.…”
Here we report a novel method for modifying commercially available TiO2 nanoparticles by a microwave-induced plasma technique. After the plasma treatment TiO2 nanoparticles showed enhanced visible absorption due to the doped W atoms, and the photocatalytic methylene blue degradation above 440 nm was successfully improved.
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