Effect of Ultrasound on the Decomposition of Sodium Dodecylbenzene Sulfonate in Aqueous Solution 


Vol. 48,  No. 6, pp. 561-567, Dec.  2004
10.5012/jkcs.2004.48.6.561


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  Abstract

계면활성제 중 sodium dodecylbenzene sulfonate(DBS) 수용액에 초음파(200 W, 6 W/cm2)를 조사하여 주파수, 용존가스 및 농도에 따른 분해경향을 조사하였다. 주파수에 따른 초음파 분해속도는 50 kHz와 600 kHz보다 200 kHz에서 가장 빠른 것으로 나타났다. 200 kHz의 초음파를 이용한 DBS의 분해반응에서는 산소를 이용하였을 때 가장 빠른 분해속도를 나타내었으며, 질소의 경우가 가장 늦은 분해속도를 나타내 초음파반응에 사용된 용존가스(산소, 공기, 질소, 아르곤, 헬륨)의 물리적성질과 활성라디칼의 생성에 의해 분해속도가 달라졌음을 알 수 있다. DBS의 농도에 따른 초음파분해 경향을 보면, 1 mM 까지 분해속도의 감소가 뚜렷하게 나타났으며, DBS의 critical micelle concentration(3 mM) 부근을 기준으로 분해속도의 변화가 거의 나타나지 않아 계면활성제의 미셀형성이 초음파에 의해 유도되는 라디칼에 의한 산화반응과 버블계면에서의 열분해반응에 영향을 미치는 것으로 생각된다. The influence of ultrasound frequency, dissolved gases, and initial concentration on the decomposition of sodium dodecylbenzene sulfonate(DBS) aqueous solution was investigated using ultrasound generator with 200 W ultrasound power. The decomposition rates at three frequencies(50, 200, and 600 kHz) examined under argon atmosphere were highest at 200 kHz. The highest observed decomposition rate at 200 kHz occurred in the presence of oxygen followed by air and argon, helium, and nitrogen. The effect of initial concentration of DBS on the ultrasonic decomposition was decreased with increasing initial concentration and would depend upon the formation of micelle in aqueous solution. It appears that the ultrasound frequency, dissolved gases, and initial concentration play an important role on the sonolysis of DBS. Sonolysis of DBS mainly take place at the interfacial region of cavitation bubbles by both OH radical attack and pyrolysis to alkyl chain, aromatic ring, and headgroup.

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  Cite this article

[IEEE Style]

B. Yim, "Effect of Ultrasound on the Decomposition of Sodium Dodecylbenzene Sulfonate in Aqueous Solution," Journal of the Korean Chemical Society, vol. 48, no. 6, pp. 561-567, 2004. DOI: 10.5012/jkcs.2004.48.6.561.

[ACM Style]

Bongbeen Yim. 2004. Effect of Ultrasound on the Decomposition of Sodium Dodecylbenzene Sulfonate in Aqueous Solution. Journal of the Korean Chemical Society, 48, 6, (2004), 561-567. DOI: 10.5012/jkcs.2004.48.6.561.

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