Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation

被引:125
作者
Ferkous, Hamza [1 ]
Merouani, Slimane [2 ]
Hamdaoui, Oualid [1 ]
Petrier, Christian [3 ]
机构
[1] Badji Mokhtar Annaba Univ, Fac Engn, Dept Proc Engn, Lab Environm Engn, POB 12, Annaba 23000, Algeria
[2] Univ Constantine 3, Fac Proc Engn, Dept Chem Engn, Lab Environm Proc Engn, Constantine 25000, Algeria
[3] Univ Joseph Fourier, Lab Rheol & Proc, F-38041 Grenoble 9, France
关键词
Sonochemical degradation; Naphthol blue black (NBB); Persulfate (PS); (OH)-O-center dot radical; SO4 center dot- radical; Computer simulation; SONO-ACTIVATED PERSULFATE; SONOLYTIC DEGRADATION; AQUEOUS-SOLUTION; WASTE-WATER; ULTRASONIC FREQUENCY; BUBBLE DYNAMICS; AZO-DYE; OXIDATION; 1,1,1-TRICHLOROETHANE; TEMPERATURE;
D O I
10.1016/j.ultsonch.2016.06.027
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
This work explores the effect of persulfate (PS) on the sonochemical degradation of organic pollutants taking naphthol blue black (NBB), an anionic diazo dye, as a substrate model. The sonolytic experiments were conducted in the absence and presence of PS under various experimental conditions including acoustic power (10-80 W), frequency (20 and 585 kHz) and saturating gas (argon, air and nitrogen). Experimental results showed that PS decomposition into sulfate radical (SO4 center dot-) takes place by sonolysis and increasing PS concentration up to 1 g/L would result in an increase in the NBB degradation rate. It was found that the PS-enhanced effect was strongly operating parameters dependent. The positive effect of PS decreased with increasing power and the best enhancing effect was obtained for the lowest acoustic power. Correspondingly, the PS-enhanced effect was more remarkable at low frequency (20 kHz) than that observed at high frequency ultrasound (585 kHz). Nitrogen saturating gas gave the best enhanced effect of PS than argon and air atmospheres. Theoretical (computer simulation of bubble collapse) and experimental measurements of the yields of free radical generation under the different experimental conditions have been made for interpreting the obtained effects of PS on the sonochemical degradation of the dye pollutant. The experimental findings were attributed to the fact that radical-radical recombination reactions occur at faster rate than the radical-organic reaction when the concentration of free radicals is too high (at higher sonochemical conditions). (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:580 / 587
页数:8
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