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- W2374910959 abstract "The present paper intends to make an investigation of the kinetic degradation mechanism of 1,1,1-trichloroethane(TCA),one of the prevalent chlorinated hydrocarbons present in the contaminated groundwater.The experimental results indicate that TCA degradation rate by ultrasonic/persulfate system tends to increase significantly 9.61 times as high as the total degradation rate of the single ultrasound and the single persulfate systems,which suggests quite obvious synergic effect.Our investigation also proves that the pseudo-first-order rate constants tends to increase with the increase of ultrasonic frequency from 50 kHz to 400 kHz but decrease both with the increase of PS/TCA molar ratio from 10:1 to 100:1 and the increase of concentration of inorganic anions(Cl-,HCO-3,CO2-3,and NO-3) in the range of 0-3.6 mg/L,0-6.1 mg/L,0-6.0 mg/L and 0-6.2 mg/L,respectively.What is more important,it is possible for TCA to be eliminated completely by ultrasound/persulfate system under the optimal conditions when the initial pH is 7.0,the ultrasonic frequency is 400 kHz with the power of 100 W,T=(20±2) ℃ and n(PS)/n(TCA)=10:1,respectively,and with the sulfate and hydroxyl radicals serving as the key oxidants.The radicals can be verified by the experiments of addition of radical scavengers(methanol and tert-butyl alcohol) to the pollutant.Based on our experiment results,the present author have also proposed a tentative pathway of TCA degradation through the mass spectrometry(PT-GC-MS) analysis in combination with the twelve types of chlorinated intermediates,which can be identified by the purge and trap gas chromatography.Its degradation proves to follow either the thermal decomposition or a free radical-induced reaction mechanism.The treatability exploration of the contaminated groundwater from the certain contamination site by this process shows that it is possible to attain the complete removal of TCA(25 mg/L) for 150 min by this method.What is more meaningful,the coupling of ultrasound and persulfate proves to be a highly promising technique for remedying the TCA-contaminated groundwater,though the TCA removal efficiency will be slightly decreased if the presence of more complicated constituents in the groundwater.Therefore,there exists a real need of an excessive amount of persulfate and sufficient oxidation time to overcome the negative effect of the above-said influential factors for its practical in situ application in the future." @default.
- W2374910959 created "2016-06-24" @default.
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- W2374910959 date "2013-01-01" @default.
- W2374910959 modified "2023-10-11" @default.
- W2374910959 title "On the mechanism of 1,1,1-trichloroethane degradation by simultaneous application of ultrasound and persulfate" @default.
- W2374910959 hasPublicationYear "2013" @default.
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