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(1)Journal of the Korean Chemical Society 2004, Vol. 48, No. 6 Printed in the Republic of Korea. Sodium Dodecylbenzene Sulfonate >Ï~ ª>wö* .r Î. ª / n*. " úªÊ ¦JVF² (2004. 6. 10 7>). ( ). Effect of Ultrasound on the Decomposition of Sodium Dodecylbenzene Sulfonate in Aqueous Solution Bongbeen Yim* R&D Center, Envors Co., Ltd., 151-13 Birae-dong, Daeduk-gu, Daejeon 306-809, Korea (Received June 10, 2004). º £. êWB 7 sodium dodecylbenzene sulfonate(DBS) >Ïö .r2(200 W, 6 W/cm )¢ Ò~ "2>, Ï&Ê 5 ³êö V ªãËj Ò~& . "2>ö V .r2 ª³êº 50 kHzf 600 kHz 200 kHzöB &Ë ©b ¾æÒ . 200 kHz~ .r2¢ Ï DBS~ ª>wöBº Ö² ¢ Ï~&j r &Ë ª³ê¢ ¾æÚîb, î²~ ãÖ& &Ë Ìf ª³ê¢ ¾æÚ .r2> wö ÒÏB Ï&Ê(Ö², V, î², j , )~ bÒ'Wî" W¢:¢~ Wö ~ ª³ê& ¢rrj r > ® . DBS~ ³êö V .r2ª ãËj , 1 mM ræ ª³ê~ 6²& Â]~ ² ¾æÒb, DBS~ critical micelle concentration(3 mM) ¦"j V&b ª³ê~ æz& ~ ¾æ¾æ pj êWB~ f;W .r2ö ~ Fê>º ¢:¢ö ~ Öz>w" ª:êöB~ ª> wö 'Ëj ~º ©b 'B . *Ú: .r2z, ¶jH~ ª:, OH¢:¢, ª>w, êWB 2. ABSTRACT. 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. Keywords: Sonochemistry, Cavitation Bubble, OH radical, Pyrolysis, Sodium Dodecylbenzene Sulfonate. * V .r2z(sonochemistry)f z>w¾ z ;öB .r2(ultrasound)¢ Ï~º îÚ zª. ¢ zbî~ ªC, W, ºÂ 5 >w"; zª¢öB z¶ ö ~ FÏ êB Ï> ® . .r2º Ò²~ æ j > ìº 16 kHz ç~ r2 ;~ > ®b, zª¢ö 1,2. V561V.

(2) ª/n. 562. B " Ï~º "2>º 20 kHz~2 MHz º* . ÂK~ .r2º z'Î"¢ FBÊº ËKj &æ ®b, çöB~ .r2z' Î"~ " öf rË¶jH~(acoustic cavitation) *ç . r Ë¶jH~ *çf (1) {», cc~ >' "; öB ¶jH~ ª:~ W(nucleation), (2) WB ¶jH~ ª:~ WË(bubble growth), (3) ®n; ç WËB ¶jH~ ª:~ »Z(collapse)f ? '' æò ³' ^ê W>Ú^ ®. . rËö.æº ¶jH~ ª: W, »Z>º ";öB ö.æ *~>, ª: »Z >>> º N(~5000 K), {(~1000 atm) z>wö &~º ©b ÒòB . Þ, >7ö .r2¢ Ò~ WB ¶jH ~ ª:f ª:Ú¦(vapor phase), ª:" ²Ï" ~ ê'(interface) 5 ²Ï" ? ëß > w'j &ê . ¸f ö.æ& Ò~º ª:Ú¦ öBº bª¶& N, {~ çöB OH¢ :¢" >²¢:¢ ª(pyrolysis)>, WB OH¢:¢ 5 >²¢:¢f ²Ïb ÿ . ª:~ ê'öBº WB OH¢:¢ ¸f ³ ê Ò~º ©b rJ^ ®b, ª:Ú¦. º Ôf Nêæò ²Ï ê ç® ¸f N ê& Ò . ²ÏöBº ª:Ú¦¦8 ÿ B OH¢:¢ 5 >²¢:¢ ÒÖ~ "Öz> ²¾ >² *~B . >Ïö .r2¢ Ò ãÖ zbî~ >w zî¾ 5 Ë²(cavitation site)º bî~ bÒ', z'Wîö ~ ²ÖB . >BW FVzbf N, {~ ç& Ò~º ª:Ú¦öB " ªö ~ ª>, ª:Ú¦ >B>æ pº j >BW, ²>Wbî 5 êWBº ª: ê' öB ªf OH¢:¢ö ~ ª>, >Wj &æ ª:Ú¦ 5 ê'ö ÿ>æ pº bî f ²ÏÚöB W¢:¢ö ~ Öz>wö ~ ªB . 7 ª>w" OH¢:¢~ »' &Ë~ ëß z' Î"& ¾æ¾º ª:ê ~ ãÖ .r2z ¶ ~ &ª¢ &v> î . Sodium dodecylbenzene sulfonate(DBS)¢ ê WB& FB ö>º ~Âb F«F ãÖ. ïb B>º ®b ~ >" &Vf 3. 2-4. 5-8. ~ bîv~ö 'Ëj ~V r^ö >7 ê~ 2Z¢ FB > ®b, ¢>' b' ¾Ò ;j Ï~ ¾Ò ãÖ "º ;ö ÒÏ>º b~ Wj &~* ¾Ò";öB~ Ë¢ F B > ® . V¢B êWB¢ ö>~ Î "' ¾Ò¢ * º&'b zbîj ÒÏ~ æ p 'Ï&Ë ¾ÒO»~ BB jº ; . öBº ¶jH~ ª:~ ê'ö ¸f ³ê Ò~º ©b rJê êWB 7 ö~ º ³ê B& &Ë~ ~ >¯ö £² 'Ï&Ë DBSj Ï~ "2>, Ï&Ê 5 ³ ê &æ ~öB ÂK .r2Òö ~ ªãËj Ò~& .. þ 5 O» £ # ò êWB 7 þö ÒÏB Î>î DBS (Wako)¢ ÒÏ~&b, Î £f WakoÒ~ ß/ j ÒÏ~& ÒÏ* ßê ;B";f ~æ p ~ . þ";ö ÒÏB Î >f ¢>Ã~>¢ Millipore Milli-Q Ê(R>18 MΩcm)öB ;B . B>¢ Ï~& . >wV Ú¦~ VÚ¢ ~~~V * &Êº (He, 99.999%), j (Ar, 99.999%), V(N +O , 99.95%), î²(N , 99.995%) 5 Ö²(O , 99.995%)¢ Ï~& . òBº b& .B> 60 mL ö *f ?f &ç&Ê Ï~ ¢; F³(150 mL/ min)b £ 30ª* ª:ç~ >wV Ú¦~ VÚ ¢ j*® ~~~&b, >wV¢ &öÊ ö~ º ³ê& >ê ¢; ·~ DBS Ï(10 mM stock solution)j î "ÒV(10 µL micro syringe) "«~ ò¢ B~& . .r `Ò Ë~ ÂK~ .r2¢ BÊV * .r2ÒË ~ 5 þË~º Fig. 1ö ¾æÚîb, .r2 " 2>º 50 kHz(BLT type, 150Ü150 mm, Kaizo, Japan), 200 kHz 5 600 kHz(.r2ÂK: 200 W)~ R« êÿ¶(barium titanate, 65 mm i.d., Kaizo, Japan)¢ Ò Ï~&b, NÚöB~ æçªj Oæ~V * "Þ ;~& . ' êÿ¶~ B «K2òº 6 W/cm FæV . >wV(Pyrex, CÏï: 190 mL, 2. 2. 2. 2. 2. Journal of the Korean Chemical Society.

(3) Sodium Dodecylbenzene Sulfonate. >Ï~ ª>wö* .r Î. 563. J~B³ÚîÆ¾b(high performance liquid chromatography, Shimadzu)¢ Ï~ N öB ªC~&b, ÏÒf NaClO f CH CN¢ 50:50~ jN ~ 1 mL/min~ F³b /~&. . &Êç>î zê~ ªCf ®ENz¦ÂV (flame ionizaion detector)f GS-molesieve¢"(J&W Scientific) ËOB &ÊîÆ¾b(HP 6890) ªC~& . ªCö ÒÏB &Êº Bê (He, 99.999%)j ÒÏ~& . "« 5 ¦ÂVNêº ' ' 250 Cf 300 C J6Nêº 40 C(5 min)öB 240 C(30 C/min) J;~& . SO ªCf 25 Cö B SI-904E¢"" *V*êê¦ÂV(electroconductivity detector)j ËO NîÆ¾b(Shodex)¢ Ï~&b, ÏÒf 1.8 mM Na CO /1.7 mM NaHCO , scavengerº 20 mM H SO ¢ '' 1.0 mL/min~ F³ b ÒÏ~& . OH¢:¢~ W³êº B> > ~ .r2ª WB OH¢:¢ ¶ ì *¦ "Öz>² ÒÖ º &;~ö "Öz>²~ ³ê êÖ~&b, "Öz>²~ ³êº ºJz ¢Ïj Ï 77ê»(λ=352 nm, Ö7ê >=26,000 M cm in a 10 mm quartz cell)b Ö; ~& . O»f £ÖW(pH 5.85)~ öB W B "Öz>²ö ~ I ~ Öz>wj Ï © . (C-18). 4. o. o. Fig. 1. Schematic diagram of the experimental apparatus for ultrasonic irradiation.. º þ";ÿn ¦Vf j*® &ö ~&b, >wNê¢ BÚ~V * Nf cooling water B~Ë~(AS ONE CB-15, Japan)¢ J~~ NÚ Nê¢ 25 C Fæ~&b, >wV Ú¦ ~ Ï~ Nêº .Vö çß~&æò 5ª ê ¢; ~² Fæ>î . >wV Ú¦~ Nê G;f W.(Pt) Òî~ probe; NêbB(Yokogawa 2542, Japan)¢ Ï~ >wV~ septumj Û~ >¯~& . >w Vöº þ2~ j 5 NêG;j * Ò~ Òî ~ septumj J~~&b, PyrexÒî~ >wV 7: f vþ¢ 1 mm ~~ ïb B·~ ®jº r2~ >Ò¾ ².j 6²V . $ >wV¢ êÿ¶¦V "2>~ >2Ë(λ/2)j r j Ï~ êÖ~ >º *Ïj v ;{~ n ;'b J~~ .r2& >wV 7öB~ > Ò ì &Ë ¸f ÎN >wV Ú¦ *>ê ~& . 50 mm i.d.). o. c f = --λ. (1). VB, f º "2>(Hz), cº >³öB~ r³(1483 m/s at 20 C) 5 λº 2Ë(mm) . "2> 50, 200 5 600 kHz~ ãÖ êÖB λ/2f '' £ 15 mm, 4 mm 5 1 mm . $ þ~ R&z¢ *~ j ~ öB B> >j .r2 ª~ WB OH¢:¢ ~ W³ê¢ G;~ ¦Æ~& . ª+O» DBS~ ªCf UV ¦ÂV(λ=223 nm)f ODS¢" o. 2004, Vol. 48, No. 6. o. 3. o. −2 4. o. 2. 2. −1. o. 3. 3. 4. −1. −. 9. Ö # 8 >ö 8 ª³ê~ æz ¶jH~ ª: »Z B>º N, {~ ç öB B> >~ ª WB OH¢:¢~ W ³êº ¢>'b ¸f "2>¢ r ©b > ® . öBº 50, 200, 600 kHz~ "2>¢ &ê êÿ¶¢ Ï~&b, >î Ò~æ p~j ãÖ OH¢:¢ ÒÖ~ W B "Öz>²~ Wf 0N>wb ¾æÒb, W³ê¢ G; Ö" 20 kHz(0.5 µM/min)f 600 kHz (4.5 µM/min) 200 kHz(9 µM/min)~ êÿ¶¢ Ò Ï~&j ãÖ ©b ¾æÒ . OH¢:¢~ . V W³ê(R )¢ jv , R /R , R /R 5 R /R f '' 18, 9 5 2 ¾æÒ . "2> & Ã&~ ª:~ »Z³êº z× z ¢^ Ö" 'b WB OH¢:¢f >wì ¶jH ~ ª: :ãb ² ÿ . ¾ Ôf " 10,11. i. i(200). i(600). i(200). i(50). i(600). i(50).

(4) ª/n. 564. 2>~ ãÖ n;B(>« Z) ª:~ W ôj æV r^ö N~ 'öBº r " ? Ö² ~ W" ?f ¦&' >wj >>~ OH¢:¢ ~ ÒÖö ~ "Öz>²~ Wj B > ® . ·OH+·OH→H2O+·O 2·O→O2. (2) (3). Þ, "2>& .Z ¸j ãÖº ª:j ;W~º ôf ö.æ& jº~ WB ª:f j*® W Ë~Vê *ö »Z>V r^ö ¶jH~ ª:Ú ¦ Nêº Ôf "2>~ ãÖ Ôjî > ® . öB ÿ¢ 200 W~ rË2ò¢ Ï ã Ö 600 kHzöB~ ¶jH~ ª: »Z W>º OH¢:¢~ W³êº 200 kHz ¶Ò² &V >î . DBS(100 µM) ªº FÒ 1N>wb ¾æÒb , ÒÏB .r2~ "2>ö ~ 'Ëj , Fig. 2f ? "Öz>²~ W³êf îR&æ 200 kHzöB ª³ê& &Ë ©b ¾æÒ . >w³ê¢ jv , k /k , k /k 5 k /k f '' 2.8, 1.6, 1.8 ¾æÒ . V¢B .r2Òö ~ "Öz>²~ W³êf DBS~ ª³êfº &ê& ®º ©b 'B . ¯, ¶jH~ ª:~ ê'ö ¸f ³ê Ò~º OH¢:¢f ê 'ö OB DBSf ² >w~ DBS¢ ª Êº ©b 'B . V¢B .r2¢ Ï Ö z>wöB ÎN &Ë ¸f "2>' Ò~ º ©b 'B . 200. 50. 600. 50. 200. 600. 13. Fig. 3. Sonolysis of DBS aqueous solutions under various gases at 200 kHz.. >Ïö Ï* Êö ~ ª³ê~ æz ¢>'b ¶jH~ ª: »ZF r B>º Nêº ÏB VÚ~ Ïïj(ratio of specific heats), *êê(thermal conductivity), Ïê(solubility in water) " ?f bÒ'ßWö ~ 'Ëj Aº . Fig. 3ö DBS >Ï(100 µM)ö 200 kHz~ .r2¢ Ò~ >Ïö ÏB &Ê~ «~ö V DBS ~ ª³ê¢ ¾æÚî . ÒÏB &Êê DBS ª ³ê~ BB¢ , Ö²(0.0424 min )>V(0.0289 min ), j (0.0286 min )>(0.0088 min )>î² (0.0065 min ) Ö²¢ Ï~&j ãÖ ª³ê& &Ë ² ¾æÒ . Ö²f ?f ö¶(diatomic) &Êº ¾ j " ?f ö¶(monoatomic) &Êf jv~ Ïïj(Ö²: 1.39, " j : 1.66)& ·V r^ö B>º ¶jH~~ ö.æ & z ·j © . 2,14. −1. −1. −1. −1. −1.  (r – 1)  m Tmax = To P --------------------  P . (4). VB, T 5 P º ¶jH~ ª:»Z B>º Nê 5 {K, T º þNê, Pº ¶jH~ ª : & V¢ &î r ª:Ú {K(¢>'b Ï. ~ ÃV{), rº ÒÏ &Ê~ Ïïj . ¾ Table 1ö ¾æÞ ©" ? Ö²& Ò ãÖ ö¶ &Ê ¾ j ôf W ¢:¢(·O, ·OH) W>º ©b '>, Ö"º ¶jH~ ª: »Z Nê~ 'Ë º max. m. o. 1. Fig. 2. Sonolysis of DBS aqueous solutions at ultrasound frequency of 50, 200, and 600 kHz.. Journal of the Korean Chemical Society.

(5) Sodium Dodecylbenzene Sulfonate. Table 1. Sonolysis of water in the presence of different gases Water sonolysis H2O→·H + ·OH. Under oxygen atmosphere ·H + ·H→H2 ·OH + ·OH→H2O2 ·H + ·OH→H2O. Under oxygen atmosphere. Under nitrogen atmosphere. ))). ))). O2→·O + ·O ·O + H2O→·OH + ·OH ·H + O2→·OH + ·O (or ·HO2) ·O + ·HO2→·OH + O2 2·HO2→H2O2+O2. ))) ·N2→ ·N + ·N ·N + ·OH→NO + ·H NO + ·OH→HNO2 N2 + ·OH→N2O + ·H N2 + ·O→N2O (or NO + ·N). 565. WB~ ª³ê& ©b ¾æÒ . ¶j r~ ª:~ »Z¢ (adiabatic)ç &; ãÖ, ¶jr~ ª:~ »Z B>º N~ ö.æº B*'b ª:êj Û"~ ²Ï b *>V r^ö ÒÏ &Ê~ *êêö ~ ~º ©b 'B . ¯, *êê& ·f j. (17.9Ü10 W/m · K)~ ãÖ ª: Ú¦öB Fæ>º Nê& (151.0Ü10 W/m · K) ¸V r^ö ôf W¢:¢~ W" N~ ª>w (pyrolysis) ¢ÚÆ ©b 'B . f ?f Ö "º b~ .r2ª 5 öÊr~ &>ª>w öBê >î . ³êö 8 ª³ê~ æz êWBº >W" ²>WV¢ &æ ®º · ãzWî r^ö >ÏçöB ²Ïö Ò ~V º êö b& O~Jº Wîj &æ ® . Ò CMC(critical micelle concentration)ö V *öº ª¶ ; Ïö Ò~ CMC& > ª¶f Wî f(micelle, êWB ~ ²Ú)¢ ;W~V · . Fig. 4º 0.1-5 mM ~ DBS¢ 200 kHz~ .r2¢ Ò~ ª Ö " DBS~ .r2ªº FÒ 1Nª>wb ¾ æÒb, *Ú'b 0.1 mM(0.0286 min )ö B 1 mM(0.0041 min )~ ³ê¦"ræº /Ï® ª ³ê& 6²~&b¾ ç~ ³êöB 5 mM (0.0013 min )ræ~ ª³êº æz& jò ©b ¾æÒ . $ DBS~ CMC³ê 3 mM ¦"ö −3. −3. Ö²~ .r2 ª>w >>>º W¢:¢~ Wzî¾ö ~ ©b 'B . ?f Ïïj ¢ <º ö¶ 5 ö¶ &Ê~ ãÖê &Ê~ « ~ö V¢ W¢:¢~ W³ê& ©b ¾ æÒb, ©f &Ê~ bÒ'Wî Ïïj ö *êê 5 Ïêê &~º ©b 'B. . þöB Ö²¢ Ï~ b~ .r2 ªö ~ WB ·OH~ W³êº 28 µM/minb j j ÒÏ®j r~ 18 µM/min © b &V>î . $ Ö²& Ò ãÖ >²¢: ¢j

(6) ³~ W¢:¢j W~æ >²¢:¢ ~ ÒÖj ÛB~ >²Wj O . Ö²¢ Ï~&j ãÖ >~ .r2ªö ~ W>º >²~ .VW³êº 0 µM/minî (j ~ ã Ö 10 µM/min). ¾ >ÏöB .r2Òö ~ Öz>wf ÚÆ &Ê& Ò~ê WB W¢:¢ö ~ ê¯F > ®V r^ö b¾ bî~ .r2ªöB Ö²~ Òº j>'æ p j © . Þ, î²¢ Ï~&j ãÖ, ¶jr~ ª: Ú ¦ö Ò~º î²ª¶º NçöB ·O, ·OH " >w~ NO¾ N O¢ W~, N Oº ¶jr ~ ª:Ú¦f ? NçöBº ç® ®n bîV r^ö NO *~>Ú «'b HNO f ?f ÖWbî *~B . V¢B î²ª¶& b ~ .r2ªö ~ WB W¢:¢" >w~ æ êWB~ Öz>wö ^~º W¢:¢ " ãç'b >w~V r^ö ª³ê& 6²> º Ö"& ¾æÒ . ?f Ïïjj &ê ö¶ &Ê j " ~ ãÖ¢ jv j j ÒÏ~&j r ê 1,6,8. 2. >Ï~ ª>wö* .r Î. 8,15. −1. −1. −1. 2. 2. 2004, Vol. 48, No. 6. Fig. 4. Sonolysis of DBS aqueous solutions at various concentration in argon atmosphere. Ultrasound frequency is 200 kHz..

(7) ª/n. 566. B ª³ê& ~ ¢; ©b ¾æ¾ êW B~ f ;W>B .r2Ò& DBS~ ª ö 'Ëj ~æ á~º ©b 'B . f ;W>æ pº ³êöB êWBº ¶jr ~ ª:~ ê'ö O>Ú ÷7'b Î ® bæ ª: Ú¦¦V W>Ú ÿB OH¢:¢ " N~ ª:"*~ ê'ö Ò~º Nö ~ Öz>w" ª& ² ¢ÚÆ > ® . Þ, f ;W>îj ãÖ ²ÏöB ;WB êWB~ 'Ëb ¶jr~ ª:~ ê' ö Îº DBS~ · ç&'b 'j ©b ' B . $ .r2Òö ~ WB W¢:¢ö ~ DBS~ ª~ ãÖ, b& ;WB fj N Ö ê ª& ·F ©b '> ²ÏöB º OH¢:¢~ ÒÖ>w" OH¢:¢ö ~ DBS ~ >w ãç'b ¢Ú¾V r^ö CMC ê¦ V ª³ê& ç® 6²B ©b 'B . .r `Òö ~ ªzî¾ êWBº >Ï 7öB .r2 Òö ~ WB ¶jr~ ª:~ ê'ö O~Jº W î r^ö ç&'b ª: "*ö ¸f ³ê Ò > ® . V¢B r " ? ¶jr~ ª: " ²Ï"~ ê'ö ¸f ³ê Ò~º ·OH~ ÒÖ>w" ãç'b >w~ ·OH~ ¢ ¦ªj

(8) ³(scavenge) > ® . >wöB~ ·OH ~ ÒÖ >w³êç> k º 5.5Ü10 M s ·OH " DBS~ >w³êç> k f 4.9Ü10 M s . 12. 6. −1 −1. 9. 6. 7. 9. −1 −1. 16. (6). RH+·OH(·H)→R· + H2O(H2). (7). (5). V¢B W¢:¢"~ >wf êWB ~ alkyl chain 7 îæï ê²¦ªöB >²¢ ªÒ Ê secondary carbon radical(−·CH−)j W . $ ÊFÒ¢ &ê êWB~ ãÖ ¾¦ê ~ zb" îR&æ ÊFÒö~ ·OH Î&>w ö ~ ª(ring opening)F > ® . Fig. 5" ? .r2 Ò* jf~ DBS~ headgroup SO ³ê& Ã&~º ©b ¾æ¾ alkylphenol ethoxylates~ .r2ª öB ¾æÂ ethoxylated chain~ ." ? ·OHö ~ DBS headgroup~ . Úê ©b 'B . $ 12. −2 4. 17,18. .r2 Òö ~ WB ·OH" 1 mM DBS~ > wf 10ª*~ .r2 Òö ~B ·OH~ W j*® ÛB>Ú ·OHö ~ Öz>w "º ª zî¾¢ ' > ® . FÒ ·ÏV¢ &ê öÊr~ .r2 ªöB .r2 Òö ~ &>ª~ &³z& >Ú .r2~ bÒ' Î" micro jet" micro mixingö ~ bî* Î "& Ã&~ ª& Úæº ©b 'B . V¢B .r2Òö V~º bÒ'Î"º öÊrzb~ &>ªf FÒ~² DBS~ > W¦ªö ·Ï~ .r2 Ò*ö jf~ SO ~ Wj ê³'b Ã&Êº ©b 'B . êWB DBSº >BW ìº bî(nonvolatile) V r^ö N~ hot spot"*(¶jr~ ª:~ ê')öB Î² > pyrolysisö ~ ªF > ® . æ êWB~ alkyl chain 7 ß; ¦ªö &êì N~ ö ~ C-C Ö pÚ æº thermal homolysis 5 β-scissionö ~ ª >Ú primary carbon(−·CH −)" methyl radical(·CH )¢ W . DBS~ ãÖ *;' ª>wb¦ V W>º &Êç Wbî zê(CH )j ;ï 'b ªC~ Fig. 6ö ¾æîb, zê~ W³ êº DBS~ ³ê& Ôj> Ã&~&b 2 mM çöBº W³ê& ~ Ã&~æ p~ . V¢B Ö"¦V DBS~ .r2 ª~ ¢¦ªf pyrolysis ö ~Bê Úöj r > ® . −2 4. 4. ))) H2O→·OH+·H ·OH(·H) + ·OH(·H)→H2O2(H2). 17. Fig. 5. Concentration of SO−4 2 produced by the sonolysis of DBS. Ultrasound frequency is 200 kHz. Initial DBS concentration is 100 M.. 2. 3. 12. 19. 4. Journal of the Korean Chemical Society.

(9) Sodium Dodecylbenzene Sulfonate. >ÏW~ ª>Mö* .H Î. 567. Òö ~ ªÎN ÎÚæº ©b 'B . (4) .r Òö ~ êWB~ "º ª zî¾f ÊFÒö ·OH Î&>w, ·OHö ~ alkyl chain 5 headgroup~ . Ò Nç ¶jH~ ª:~ ê'öB~ pyrolysis b ' > ® .. Ï^ò. Fig. 6. Formation rates of methane as a function of the concentration of DBS. Ultrasound frequency is 200 kHz. Sonication time is 10 min.. Ö V \öBº ¶jH~ ª:~ ê'ö ¸f ³ê Ò~º ©b rJê êWB 7 DBS >Ïö ÂK~ .r ¢ Ò~ " >, Ï &Ê 5 ³êö V ªãËj Ò~ r ? f Ö¢ áî . (1) ÒÏB " >ö V .r ª ãËj , 50 kHz 5 600 kHz 200 kHz~ " >¢ &ê ê ÿ¶¢ ÒÏ~&j r &Ë ª³ê¢ ¾æÚ Ú Özª>wö &Ë ±f >w³ê¢ ¾æÚº " >& Ò~º ©b 'B . (2) .r >wö ÒÏB Ï&Ê~ >Ò'Wîö ~ ª³ê& ¢öj r > ®b, DBS~ . r ª>wöBº Ö²(0.0424 min )¢ Ï~& j r &Ë ª³ê¢ ¾æÚî î²(0.0065 min )¢ Ï~&j r &Ë ¶Ö ª³ê¢ ¾æÚ Ú .r Ò W>º W¢:¢~ V& ©b 'B . (3) DBS~ ³êö V .r ª ãËj , 1 mM ræ ª³ê~ 6²& Â]~² ¾æÒb, DBS ~ CMC(3 mM) ¦"j V&b ª³ê~ æz& ~ ¾æ¾æ p~ . êWB~ ³ê& ¸jæ B fj ;W~² >Ú ç&'b ¶jH~ ª:~ êö WO>º jN 'ÚæB .r −1. −1. 2004, Vol. 48, No. 6. 1. T. J. Mason, Practical Sonochemistry: User’s Guide to Applications in Chemistry and Chemical Engineering, Ellis Horwood, West Sussex, 1991. 2. T. J. Mason, Sonochemistry, Oxford University Press, Oxford, 1999. 3. K. S. Suslick, Science, 1990, 247, 1439. 4. B. Yim, Y. Nagata, Y. Maeda, J. Phys. Chem. A, 2002, 106, 104. 5. A. E. Alegria, Y. Lion, T. Kondo, P. Riesz, J. Phys. Chem., 1989, 93, 4908. 6. A. Henglein, Advances in Sonochemistry, T. J. Mason, Eds., JAI Press Ltd, Stamford, CT, U.S.A., 1993, 3, 83. 7. I. Hua, R. H. Hechemer, M. R. Hoffmann, J. Phys. Chem., 1995. 99, 2335. 8. B. Yim, Y. Yoo, Y. Nagata, Y. Maeda, Chem. Lett., 2001, 9, 938. 9. B. Yim, H. Okuno, Y. Nagata, Y. Maeda, J. Hazard. Mater., 2001, B81, 253. 10. C. Petrier, M. F. Lamy, A. Francony, A. Benahcene, B. David, J. Phys. Chem., 1994, 98, 10514. 11. J. A. Frim, J. F. Rathman, L. K. Weavers, Wat. Res., 2003, 37, 3155. 12. J. Z. Sostaric, P. Riesz, J. Am. Chem. Soc., 2001, 123, 11010. 13. M. A. Beckett, I. Hua, J. Phys. Chem. A, 2001, 105, 3796. 14. K. S. Suslick, Ultrasound: its chemical, physical, and biological effects, VCH, Weinheim, 1988. 15. C. von Sonntag, G. Mark, A. Tauber, H. P. Schuchmann, In “Advances in Sonochemistry” T. J. Mason, Eds., JAI Press Ltd, Stamford, CT, U.S.A., 1999, 5, 109. 16. G. B. Buxton, C. L. Greenstock, W. P. Helman, A. B. Ross, J. Phys. Chem.Ref. Data, 1988, 17, 513. 17. H. Destaillats, H. M. Hung, M. R. Hoffmann, Environ. Sci. Technol., 2000, 34, 311. 18. K. Vinodgopal, M. Ashokkumar, F. Grieser, J. Phys. Chem. B, 2001, 105. 3338. 19. A. Henglein, M. Gutierrez, J. Phys. Chem., 1988, 92, 3705..

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