“…However, the amount of SMX degradation decreased from 75.1 to 13.4 mg. Additionally, the k values increased with the decrease of C 0 . A larger amount of SMX needed more reactive species to degrade, but the number of reactive species was almost constant in the plasma-RPB when P was fixed . Hence, lower η values were obtained under higher C 0 values.…”
Section: Resultsmentioning
confidence: 96%
“…The increase of P enhanced the electric field intensity, resulting in more streamer channels and more intense UV radiation in the discharge gap, which was conducive to SMX degradation in the plasma section. 38 Moreover, increasing P also strengthened the dissociation, ionization, and excitation of gas molecules, which was beneficial to the generation of reactive species. Abundant ozone was introduced into the RPB section, and then the SMX degradation was greatly enhanced.…”
When oxygen plasma contacts with liquid, abundant reactive species are generated to degrade the contaminant. Ozone is the main reactive species in the gas phase, but only part of it is utilized during wastewater treatment owing to its low solubility. In this work, a novel rotating packed bed reactor integrated with plasma (plasma-RPB) was developed to fully utilize ozone and enhance wastewater treatment. The ozone−water mass transfer efficiency of the plasma-RPB with different liquid distributor structures was evaluated. Subsequently, a dimensionless correlation for predicting the volumetric mass transfer coefficient of the plasma-RPB with the rotating cylinder was established, and the deviation between the predicted and experimental values was within ±6%. Employing the plasma-RPB, sulfamethoxazole and TOC removal efficiency reached up to 87.6 and 82.7% within 5 min, respectively, exhibiting prominent degradation performance compared with other advanced oxidation processes. This work provides an effective route for wastewater treatment.
“…However, the amount of SMX degradation decreased from 75.1 to 13.4 mg. Additionally, the k values increased with the decrease of C 0 . A larger amount of SMX needed more reactive species to degrade, but the number of reactive species was almost constant in the plasma-RPB when P was fixed . Hence, lower η values were obtained under higher C 0 values.…”
Section: Resultsmentioning
confidence: 96%
“…The increase of P enhanced the electric field intensity, resulting in more streamer channels and more intense UV radiation in the discharge gap, which was conducive to SMX degradation in the plasma section. 38 Moreover, increasing P also strengthened the dissociation, ionization, and excitation of gas molecules, which was beneficial to the generation of reactive species. Abundant ozone was introduced into the RPB section, and then the SMX degradation was greatly enhanced.…”
When oxygen plasma contacts with liquid, abundant reactive species are generated to degrade the contaminant. Ozone is the main reactive species in the gas phase, but only part of it is utilized during wastewater treatment owing to its low solubility. In this work, a novel rotating packed bed reactor integrated with plasma (plasma-RPB) was developed to fully utilize ozone and enhance wastewater treatment. The ozone−water mass transfer efficiency of the plasma-RPB with different liquid distributor structures was evaluated. Subsequently, a dimensionless correlation for predicting the volumetric mass transfer coefficient of the plasma-RPB with the rotating cylinder was established, and the deviation between the predicted and experimental values was within ±6%. Employing the plasma-RPB, sulfamethoxazole and TOC removal efficiency reached up to 87.6 and 82.7% within 5 min, respectively, exhibiting prominent degradation performance compared with other advanced oxidation processes. This work provides an effective route for wastewater treatment.
“…In the presence of oxygen free radicals, a series of oxidation reactions would occur in the PBCD-based system, which could produce oxidizing substances, including •O 2 − , •OH and 1 O 2 radicals, as shown in Eqs. (6) , (7) , (8) , (9) , (10) , (11) [40] , [41] , [42] , [43] . O 2 + e → e + 2•O O 2 + e → •O 2 − •O + H 2 O→•OH •O + H 2 O → H 2 O 2 •O 2 − + H 2 O 2 → 1 O 2 + OH − + •OH •O 2 − +•OH→ 1 O 2 + OH − Fig.…”
“…It is worth noting that the mineralization efficiency of pollutants by ozonation is relatively low, and very good mineralization can be obtained by non-thermal plasma. Li et al [122] compared the degradation of IBP by different AOPs. Except that the energy yield of photo-Fenton is slightly higher than that of water film DBD plasma, the energy yield of other AOPs is relatively low.…”
Section: Water Remediationmentioning
confidence: 99%
“…Next, TP5 is deprotonated to form the product TP6, followed by demethylation and decarboxylation under the action of reactive species to generate TP7 and TP8 in turn. Li et al [122] proposed the possible degradation pathway of IBP in DBD plasma based on DFT analysis. DFT was used to describe the molecular properties of IBP, which can reveal the potential of IBP in specific degradation reactions, as well as the optimal location of electrophilic or nucleophilic reactions in the molecule.…”
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