Tuyen tap bao cao ky niem I 5 nam thanh lap Vien Khoa hoe Vat lieu Ha Noi, 6/2008 NGHIEN CUU PHAT TRIEN ANOT TRO TREN CO SO HON HOP OXIT KIM LOAI VA KHA NANG UNG DUNG TRONG XlT LY CAC CHAT HUU CO DOC[.]
Tuyen tap bao cao ky niem I nam lap Vien Khoa hoe Vat lieu - Ha Noi, 6/2008 NGHIEN CUU PHAT TRIEN ANOT TRO TREN CO SO HON HOP OXIT KIM LOAI VA KHA NANG UNG DUNG TRONG XlT LY CAC CHAT HUU CO DOC HAI KHO PHAN HUY Nguyen Ngoc Phong, Do Chi Linh, Pham Hong Hanh, Ngo Anh Tuyet, Hoang Thj Binh Vien Khoa bgc Vat lieu, Vien Khoa bgc va Cdng nghe Viet Nam 18 Hoang Quoc Viet, Quan Cau Giay, Ha Ndi; E-mail: phongnn@iins.vast.ac.vn Tom tat Dien cue anot titan phii hon hgp oxit hoat hoa Ru02, Ir02 va oxit tra Ti02, SnO:, Sb:05 da dugc che tao bang phuang phap phan hiiy nhiet dung dich phii chu'a cac muoi kim loai tuong irng Do ben va tinh chat dien hoa ciia anot dugc nghien ciru bang cac ky thuat dien hoa Cac ket qua cho thay anot Ti/Ru02-Ti02 vdi 30-50% Ru02 CO dp ben va hoat hoa cao cho qua trinh thoat dung dich NaCI dam dac Do ben ciia anot dugc nang cao bdi Ir02 lap phii trung gian va lap phii hoat hoa Vdi dien cue anot Ti/lrO:-Sb205-Sn02 he so Tafel cho qua trinh thoat oxy giam vdi ham lugng IrOi tang lap phii Nhung anot vdi Ir02 > 10% co qua the oxy thap phu hgp cho qua trinh thoat oxy Cac dien cue anot da dugc nghien ciru irng dung xir ly nude thai chira cac chat huu co doc hai kho phan hiiy GIOI THIEU Tir dirge phat minli each day hon 30 nam, dien cue anot tren co sd hon hgp dxit phii tren nen titan (dimensionally stable anode-DSA) da dugc irng dung nhieu linh vuc dien boa khac [1-3] Dien cue andt tro dugc che tao tir kim loai nen chii yeu la titan va lap phii boat boa dien hda la hdn hgp oxit kim loai Ldp phii hon hgp dxit bao gom cac dxit boat hda cd tinh dan dien nhu kim loai va dxit tro Thanh phan boat hda thudng la dxit Ru02 va Ir02 cdn phan tro thudng la dxit Ti02, Sn02 hoac Ta205 Cac dxit tro ldp phii se lam tang ben va giam gia dien cue Chirc nang ciia ldp phii boat boa la cung cap ddng dien den be mat tiep giap dien cue-dung dich va giir cho cac phan irng andt theo yeu cau xay Uu viet chinb ciia cac andt so vdi eae andt dang khdi nhu gang silic, graphit la tinh chgn lgc, ben an mdn va kicb tbirdc nho, nhe Andt cd the irng dung dugc tbirc te phai dat dugc ba yeu cau sau [4]: dan dien xiic tac dien boa va ben .Andt cd dan cao la can thiet de tang hieu qua sir dung nang lugng tinh chat xiic tac dien boa tdt de tang san pham dien phan Do ben cao la rat quan trgng, vi su an mon dien cue se gay ban san pham, lam tang gia vat lieu va sira chira Andt dua tren hon hgp RuOi va TiO^ da dugc sir dung cdng cdng nghiep san xuit xiit-clo [5] Cac andt chi ben doi vdi qua trinb thoat clo dung dich ed nong CI" cao, chiing lai khdng ben doi vdi qua trinh thoat oxy mdi trudng axit [6] Cac phat trien ve vat lieu andt tiep theo da lam tang kha nang sir dung ciia cac andt dxit cac qua trinh dien hda khac nhu bao ve catdt chong an mdn, cdng nghe mdi trudng cdng nghe dien phan kim loai [7,8] N^oai phtin irng giai phdng clo nhirng dung dich chira Cf phan irng giai 263 Cong trinh kinh tang Gido su Vien sy Nguyin Van Hieu nhdn dip Gido su Vien sy '^0 tuoi phdng dx} la phan irng andt thudng xay nhit dien phan dung dich nude Hon niia, no la phan ung phu khdng mong mudn nhilu qua trinh andt (nhu oxy hoa cac chat hiiu co) Trong tat ca cac trudng hgp tren, viec lira chgn va tim kiem vat lieu anot thich hgp cho tirng qua trinh dien hoa eu the la rat quan trgng Ddi vdi qua trinh thoat oxy, oxit IrO^ nhu da biet, la chat xuc tac dien boa va rat ben viing cho qua trinh nay, no co thdi gian sir dung Idn hon khoang 20 Ian RUO2 Tuy nhien, Ir02 dat hon nhieu RUO2 va boat boa thap ban Ngoai ra, de lam giam gia ciing nhu nang cao tinh chat cua ldp phu andt nhung phan khac cung da dugc nghien ciru Nam 1986 R Kotz va S Stucki [9] da ket hgp Ir02 vdi RUO2 nham tdi uu boa giira hoat hoa cao va gia thap eiia RUO2 vdi ben vu:ng tdt ban cua Ir02 Vao nhirng nam 90, hang loat hon hgp oxit bai hoac ba cau tir da dugc thir nghiem [10-16] Cac loai dxit iridi, ruteni va platin dugc chgn lam cac cau tir dan dien va xiie tac; cdn cac dxit tantali, titan va thiec dugc sij dung nhu cac chat dn dinh khdng dan dien Ngudi ta thay rang Ir02-Ta205 la cap tot nhat va ti le tdi uu IrQ2:Ta205 la 70:30 (%mol), dudi ti le ben cua dien cue anot giam manh Tuy nhien, dang andt gia cdn cao sir dung ham lugng Ir02 cao hon hgp Trong bai chiing tdi mudn gidi thieu mot sd ket qua nghien cuu ve dien cue anot tro dugc che tao bang phuong phap phan buy nhiet: tinh chit dien hda, bin va kha nang irng dung ciia chiing xir ly cac chit hiJu co ddc hai kho phan hiiy bing phuong phap dien boa THUC NGHIEM Chuan bi dien cue Cac dien cue dugc chuin bi bing phuong phap phan hiiy nhiet [11] Mau nen dien cue dugc cit tir tim Ti ciia Trung Quoc cd ky hieu TA2 (99,4%) co kicb thude 40x1 Ox 1mm; dugc tiy diu mo dung dich 5g/l NaOH, 30g/l Na3P04, 40g/l Na2C03 d 60''C 30 phiit va tiy hoa bgc 10% axit oxalic trudc klii tao ldp phii Dung dich phii ciia cac mudi kim loai dugc pha dung mdi n-butanol Trgn cac dung dich cd chira ion Ru vdi ion Ti theo cac ti le nhit dinh dl tao ldp hon hgp oxit co cac phan moi theo y muon Cac miu Ti sau da sir ly nhu tren dugc nhirng dung dich phii tuong irng, lam khd miu da dugc phii d nhiet 70°C 10 phiit, nung dnhiet 350°C 15 phiit Cac budc tren dugc lap lai nhilu lin dl dat dugc chilu day mong muon Ldp cuoi ciing dugc nung d cac nhiet 500''C thdi gian gid Doi vdi cac mau dien boa, day din dugc ndi true tilp vdi nen Ti bing keo bac Dien ticb mau de dien boa la cml Phin cdn lai va day din dugc phii bing nhira epoxy Cdc phuong phap dien hod: Cac phe^ dien hoa dugc thuc hien dung dich IM H2SO4 d nhiet phdng Binh dien hoa 200 ml vdi ba dien cue Dien cue phu la platin Pt Dieii cue so sanh calomel bao boa SCE dimg dl thi ciia dien cue lam viec Cau agar va dau Haber-Luggin lam giam tdi da sir sut thi giQa dien cue lam vice va dien circ so sanh Khoang each giira diu Luggin va dien cue lam viec khoang mm Cac phep dien boa dugc thuc bien tren he thing dien boa tu dgng CMS 100 cua My va 264 Tiiyln tap bao cao ky niem 15 nam lap Vien Khoa hoc Vat lieu - Ha Noi 6/2008 potentio-galvanostat PSG 81 ciia Tay dire Phuang phcip voltammetry vong dugc sir dung de xac dinh dien tich khoang dien the tir den 800 mV(SCE), tinh chat dien hda ciia cac ddi tugng nghien ciru Trong khoang dien the niiy qua trinh thoat oxy va hydro khdng xay Dien tich dugc tinh bang each tich phan tren toan bd dudng cong voltammtry, no la tong cac gia tri tuyet ddi ciia dien tich andt va dien ticb catdt Tde quet the la 50 mV/s Phuang phap ddng tinh dugc thuc hien d mat ddng 0,5 va A/em 1M H2SO4 de xac dinh thdi gian sdng cua dien cue KET QUA VA THAO LUAN Dien cue anot cho qua trinh thoat clo Ti/Ru02-Ti02 Nhirng tinh chat quan trgng nhat ciia dien cue la boat hda, ben va qua the thoat clo Do boat boa ciia andt phu tbugc vao mat cac diem hoat boa va dien tich be mat thuc eiia andt Hai dai lugng lien quan vdi va khd cd the xac dinh dugc tirng dai lugng rieng biet bang cac phuang phap dien boa Hon nua, lugng cac diem boat boa cd the thay ddi phu tbugc vao ban chat tu nhien eiia phan irng giai phdng cac dxy va clo 0,40 E[V(SCE)1 0,60 0,80 100 150 V [mV/s] 250 Hinh I: (a) Pho voltametry vdng dien hinh ciia dien cue Ti/RuO2(30%)-TiO2(70'X)) JXI H2SO4 Toe quet v = 50 mV/s (b) Sir phu thiioc ciia dien tich q vcio toe quet the ciia cdc dien cue cd ham lirang R11O2 khdc nung a 450"C Dung dich IXI H2S0.4- Dd boat boa cua cac vat lieu andt thudng dugc danh gia bang phuang phap voltametry vdng Phd voltametiy vdng dien hinh nhu tren hinh la Mot nhirng ket qua dien ticb dugc tinh tir phd voltametry vong dugc the hien tren hinh lb Vdi ham lugng RUO2 ldp phii den 50% thi thay rang ldp phii vdi RUO2 cang cao thi boat hoa cimg cao Cac ket qua kliae cho thay ham lugng tren 50%) thi boat hda lai giam, RUO2 kit tinh dang khdi, hat tinh the to hon Qua the thoat clo tren andt vdi phan ldp phii khac dugc the bien tren hinh va cho thiy vdi ham lugng 30-50%RuO2 andt cd qua the thoat clo thap nhat, tuong irng vdi boat hda cao nhat Qua the thoat clo phu tbugc vao nong Cf dung djch (hinh 3), ndng CV cimg cao qua the cang thap 265 Cdng trinh kinh tang Gido su Vien sy Nguyen Van Hieu nhdn dip Gido su Vien sy '0 tuoi -3 -3 -2 log(i) [A/cnf] -2 -1 log(i) [A/cm^ Hinh 2: Duang cong phdn cue ciia anot Ti/Rii02-Ti02 300g/l NaCl solution, T=25"C, pH=2 Hinh 3: Diixhig cong phdn cue ciia anot 30%RiiO2 dung dich NaCl, T=25"C pH=^2 Do ben ciia andt dugc danh gia bing phep ddng tinh d mat 0,5 A/cm^ IM H2SO4 Cac ket qua cho thiy andt vdi 30% RUO2 cd thdi gian song lau nhit Cac kit qua cua phd phan tan tia X theo nang lugng EDS (hinh 5) cho thiy Ru ldp phu bj boa tan dan dan cimg vdi su giai phdng dxy andt dugc phan cue d mat ddng cao Su giai phdng dxy ed the xay tir cac dxit boa trj cao ban theo qua trinh xiic tac di tbI / 50 100 150 200 Time [mini 250 300 'ri f^^ III' Ndng Hinh 4: Hieu dien the ciia he theo thdi gian IM H2SO.1 a mat dong 0.5 A/em\ lifOng Hinh 5: Phd EDS ciia mdu Ti/RuO2(30%) trudc (a) vd sau (b) thir nghiem Dien cue anot cho qua trinh thoat oxy Ti/Ir02-Sb205-Sn02 H? andt tro Ti/RuOj-TiOj chu yeu dugc sir dung mdi trudng cd nong Cf cao, Chang ban nhu dien phan xiit-clo Chiing bin qua trinh andt uu tien phan dug giai pbdng clo va kem ben virng dudi tac ddng ciia phan ung giai phdng dxy Trong phin 266 Tuyen tap bao cao ky niem I nam lap Vien Khoa hoc Vat lieu - Ha Noi, 6/2008 chiing tdi trinh bay ket qua nghien ciru mot be anot tro mdi tren co sd titan phii hdn hgp dxit Ir02-Sb203-Sn02 He anot se dugc sir dung dung dich co ndng Cf thap hoac khdng ed Cf nhirng trudng hgp lien quan den qua trinh thoat dxy Do boat hda ciia dien cue Ti/Ir02-Sb205-Sn02 dugc danh gia thdng qua Idia nang trao ddi dien tir ciia cap dxy hda khir [Fe(CN)5]''7[Fe(CN)6]''' Ddi vdi cap dxy hoa klur niiy nbtr da biet khdng ed sir lien ket boa bgc giira chimg vdi be mat dien cue, dd qua trinh trao ddi dien tir khdng bi anh hudng bdi sir hap phu Hinh la voltametiy vong diln hinb ciia cap [Fe(CN)6]^7[Fe(CN)6]'^" tren dien cue Ti/Ir02-Sb20rSn02 vdi 10% Ir02 Ddi vdi cac dien circ cd ham lugng Ir02 khac, dudng cong cd dang tuong tu song cac pic ddng ip vii hieu ciia dien the pic andt va catdt AEp khac Dang dudng cong cho thay tinh chat thuan nghich rat tdt ciia cap dxy boa khir tren dien cue Cac kit qua cho thay 0005 Q003 'T 0001 5-0001 -0.003 -O005 -0.20 030 ^(SCE)] 080 Hinh Dudng cong phdn cue voni^ cua cap oxy hda khir [Fe(CN)(,f/[Fe(CN)6]'' tren dien cue Ti/Ir02-Sb20i-Sn02 vdi 10%) IrOi Ndng ferri-ferroeyanide Id 0.0IM IMH2SO.1 v = 50 mV/s Hinh Sir phu thude ciia mat dong ip and AEp vao hdm luang lr()2 ldp phii Dieu kien nhu hinh Dien the cac pic lech khdi dien the thuan nghich ciia cap fero-feri cyanua ham lugng IrOi thay ddi lii do dan ciia ldp phii va lugng cac diem boat boa tren be mat dien cue khac Cac dien cue vdi biim lugng IIOT > 10%) cd mat dong cac pic ip cao va khoang dien the giira cac pic AEp thap va cac dai lugng thay ddi rat it Ir02 tang (hinh 8) Dieu chirng td cac dien cue cd lugng cac diem boat boa tren be mat va dan cao Khi lr02 tang, boat boa tang khong dang ke Trong do dan hay kha nang trao ddi dien ticb ciia andt phu tbugc rat nhieu vao ndng ciia IrO^ ldp phii lrC)2 < 5% Sir sut the Idn tren ldp phu ciia anot do dan thap dan den lam giam pic ddng ip va ndi rgng khoang each giiia cac pic AEp Hon nira ip va AEp cimg bi anh hudng ciia ldp Ti02 mong giira nen titan va ldp phii ben ngoai thudng dugc tao qua trinh nung che tao miiu Do ben boat hoa ciia andt dugc thir nghiem gia tdc bang phuong phap ddng dn dinh d mat ddng lA/cm" IM H2SO4 Dien cue andt Ti/IrO2(10%)-Sb2O5-SnO2 thi hien boat boa tdt sau khoang 300 gid thir nghiem (binh ) Sau dien thi bit diu lanii dan boat boa gicim Thdi gian song ciia dien cue Ti/IrO2(10%)-Sb2O5-SnO2 267 Cdng trinh kinh tang Gido sir Vien sy Nguyen Van Hieu nhdn dip Gido su Vien sy 70 tuoi khoang 350 gid dai ban nhieu so vdi dien circ Ti/Ir02 d ciing mot dieu kien thu nghiem Khi thir nghiem kit thiic, b l mat miu vin cdn ldp phii, khdng thiy bd nen titan Hon niia khdng thiy xuat hien nhirng bgt den dudi day binh nhu trudng hgp dien cue Ti/IrOj Nhirng dilu chirng td ldp phii lien kit tot vdi nin titan va dd su khu boat hoa cua anot cd thi la boa tan ldp phii va thu ddng nen titan, co cbl thudng thay dien cue boat dgng d mat ddng cao IrRuTiO, ^9 0) i oj O '• ):Si :d 100 200 Time [h] 300 400 Hinh Thai gian sdng ciia anot IM H2SO4 Mat dong phdn cue lA/cm^ a 30"C I%Si»',.-.-.'- Hinh 9: Anh SEM ciia be mat andt Ti/IrSbSnO, vdi 10% IrO, Nghien cuu ung dung anot tro" xii' ly nuoc thai chiia cac chat huu co doc hai Trong nude thai cdng nghiep cd chira nhieu chat hiru co cd tinh ddc hai cao nhu phenol, chlorophenol, cac dan xuat eiia phenol, dac biet la cac hgp chat nitro thom cd tinh chay no, cac loai thude trir sau, diet cd la cac chat ben virng chua nban benzen thi rat kho CO the phdn buy bdng phuang phap vi sinh Phuang phap boa bgc cd the dxy boa mot sd cac hgp chat cac chat it ddc hai ban, nhung loai trir hoan toan TOC thi rat khd khan Chang ban dxy hoa phenol bang dzdn chi loai trir dugc 30%) TOC, dxy hoa bang H2O2 + tac nban feton ciing cho ket qua tuong tu Phuong phap dien boa cd the dxy boa hoac khir cac chit khd cd thi phan buy bing vi sinh ke tren cac chat cd the phan buy bang vi sinh hoac cd thi dxy boa din CO2 va H2O Phuong phap xir ly dien boa nude thai cdng nghiep cang dugc quan tam no cd nhung uu diem rieng nhu thiet bi don gian kha nang linh dgng cao doi vdi quy mo vixa va nhd, dau tu ban dau thap, tdc dugc dieu khien bing ddng dien nen de tu ddng hoa, can rat it hoac khong can boa chat qua trinb xu ly va la cdng nghe "xanh" than thien vdi mdi trudng: it sinh boa chat doe thir eip chgn lgc cao Phenol, chlorophenol, cac hgp chit nitro thom TNT TNR da dugc lira chgn lam doi tugng nghien ciru Tinh chit dien hda ciia phenol va chlorophenol da dugc nghien ciru bing phuong phap voltametry vdng, mot nhung kit qua nhu tren binh 10 Bang la mot so thdng sd difn hda dugc tinh tir dudng cong CV Cac kit qua cho thiy phenol va chlorophenol cd the dugc dxy hda tren dien cue andt tro da cbl tao d dien thi tuong dii ^68 TuyIn tap bao cao ky niem 15 nam lap Vien Khoa hoc Vat lieu - Ha Noi, 6./2008 thap va thip ban qua thi thoat dxy tren dien cue Anh hudng ciia pH dung djcb den qua trinh dxy hda rat rd ret Trong dung djcb kiem pFI = 12 dien the dxy hda rat thap \'a mat ddng cao ban ban dung dich trung tinh va axit (bang 1) Khi cd mat cua NaCl, cac dudng cong cho thay CI" khdng anh hudng nhieu den qua trinh oxy hda phenol va chlorophenol, nhung tren nhanh catdt cd xuat hien pic tao CIO' va day se la tac nban dxy hda gian tiep phenol va chlorophenol Nhu vay dung dich ed Cf, phenol va chlorophenol cd the vira dxy hda true tiep tren andt, vira dxy hda gian tiep bang CIO' Cyclic Voltammetry Cyclic Voltammetry pH=2,t6c qu6t 60mV/s pH=7,t6c (36 qu6t 50 mV/s 20&02 1 20E-02 pH=2 00E-02 •1 00&02 4-Clpritrntil SmM I c l p f i e n o i SmM- fsBO 5"/ eUOE-03 a OOE-03 4cl-pnenol SrrM- PMacl 8% 4Ci-p^enoi5^^M- TJaO! 5% 6DOE-03 • 00E-03 aa-phenol 5mM- ^ a a 2% • 00e-03 o 4COE-03 • ; ,/ \\ dO-phenol-NaOOS'A H 4a-prienoJ 5mM- NaO a% // 4a-prionoi5rrMr4aai 5% OOO&'OO ' •2OOC-03 • 000 0OE-03 ~ n JO- phenol 5nWNaa2% / / Jb /•""'^ "^ 2OOE-03 •• y r-~~ oooe-Do < prt^7 4a-phenol5mM If 'zzzi:^^^'' -2 00E-03 • 200 400 600 600 000 200 0000 200 400 eOO 800 coo 2C0 400 Ftitentjnl(V) Hinh 10 Dudng cong CV ciia qud trinh phdn hiiy 4-chlorophenol 0,1 MNa2S04 vdipH vd NaCl khdc Tdc quel the 50 m V/s Bang 1: Cdc thdng sd dien hda ciia qud trinh dxy hoa phenol vd 4-chloropheno!; Dung dich mXI 0,1 XI Na2S04 vdipH khdc nhau; Tdc dp quel the 50 mV/s Phenol 4-chlorophenol pH Dien the phan hiiy, Eha [V(SCE)] Dien the pic Ep,JV(SCE)] Dong pic Ip,c [mA] 0,74 0,89 2.8 0,69 0,89 2,8 12 0,26 0,5 3,8 0,76 0,9 2,4 0,7 0,88 2.5 12 0,26 0,44 2.8 Kha nang dxy boa phenol da dugc khao sat thong qua viec nhu cau dxy hoa hoc (chemical oxygen demand - COD) Hinb lib bieu dien qua trinh giam COD theo thdi gian dien phan cua dung dich chira phenol dugc dxy hoa tren cac vat lieu anoi khac Kit qua cho thay COD giam rit nhanh sir dung andt Ti/Ir02(r/o)-Sn205-Sn02 va 269 Cdng trinh kinh tang Gido su Vien sy Nguyen Van Hieu nhdn dip Gido su Vien sy 70 tuoi COD chi cdn khoang 50 mg 02/dm^ sau dien phan 40 Ah/dm\ Trong dd neu sir dung andt Ti/Ru02 va Ti/Ir02 COD giam rat cham Nhu chung ta da biet phan irng giai phong dxy la phan irng phu canh tranh vdi phan irng dxy boa cac chat bun co tren dien cue, cho nen hieu suat dxy hoa thap ddi vdi andt Ti/Ru02 va Ti/Ir02 la ddng dien chu yeu bi tieu thu cho phan irng giai phdng oxy, nhiing andt cd qua the dxy thap (hinh 11a) 3000 20 log i [Aycm ] 40 60 Q[Ah/drn>] Hinh 11: (a) Dudng cong phdn cue ddng dn dinh ciia phdn irng gidi phdng dxy tren edc dien cue khdc dung dich IM H2SO4 (b) Sir phu thude ciia nhu cdu dxy hod hoe COD vao dien tich tieu thu qud trinh dien phdn dxy hod phenol tren cdc andt khdc Nong phenol ban ddu: 10 mM Mat ddng andt: i = 0,05 A/cm' Qua trinh phan hiiy dien hda ciia cac hgp chit thude nd, thuoc phdng ddc hai TNT, TNR tren dien cue andt tro da dugc nghien ciru Anh hudng cua ban chit dien cue anot, catdt, cac dieu kien dien phan nhu nong do, pH, nhiet dung dich, mat ddng, thdi gian dien phan den hieu suit phan hiiy TNT, TNR da dugc thir nghiem nhim xac dinh che tdi uu cho xii' ly nude thai chira cac chit ddc hai Mot nhung kit qua dugc dua bang Cac ket qua nghien ciru cho thiy be dien phan sir dung anot hoac catdt la dien cue hon hgp dxit cho hieu suit phan hiiy TNT va TNR cao ban bin sir dung graphit lam andt hoac catdt Khi sir diing anot tro hon hgp dxit mat ddng anot cd the ap dung len den A/dm^ neu ndng cac chit cin phan hiiy cao, dii vdi andt graphit mat ap dung tdi da chi la 0,5 A/dml Hieu qua phan buy cao nhit nlu ca andt ya catdt diu la dien cue hon hgp dxit Ddi vdi TNR chi cin sau 10 phut dien phan hieu suit phan buy da dat 100% cdn dii vdi TNT phai mit 180 phiit d mat dong lA/dnr Catdt la Fe Pb, Cu va graphit khdng cd anh hudng rd ret din qua trinh phan hiiy Bdng Anh huang ciia bdn chdt dien cue andt vd catdt tdi hieu siidt phdn buy (//, %) TNTvd TNR; (A)/(K)=andt/catdt XIe02=andt tra hdn hop dxit, Gf^graphit: (C=30 mg/l, ph^- 7, idp-1 A Mm' C\ari = i ^ / / , ' " = 25'C) Thdi gian MeOi/ Me02 Me02/Pb Me02/Fe Gf/Gf Gf/Pb Gf/Fe [phiit] (A)/(K) (A)/(K) (A)/(K) (A)/(K) (A)/(K) (A)/(K) 60 TNT r 92,2 80.6 84,1 42.6 39,3 26,3 270 Tuyen tap bao cao ky niem 15 nam lap Vien Khoa hoc Vat lieu - Ha Noi, 6/2008 TNR 180 10 30 60 100 100 96,2 100 100 100 70,1 47,9 72,2 92,9 68,5 28,5 61,5 88,4 54.2 27,9 61.4 87,6 KET LUAN Dien cue andt tro da dugc ap dung rgng rai, tir lau cac ITnh vijc dien hoa kliac nliau d cac nude phat trien, dd d Viet Nam viec ap dung chiing van cdn rat han che Viec nghien ciru che tao va ap dung loai dien cue andt hdn hgp dxit la rat can thiet Anot Ti/RuO2(30%)-TiO2 dugc che tao bang phuong phap phan hiiy nhiet, phii hgp cho qua trinh thoat clo, cdn andt Ti/IrO2(10%)-Sb2O5-SnO2 cd ben cao cho qua trinh thoat dxy Anot vdi ldp phii hdn hgp dxit van cdn qua trinh nghien cuu phat trien Nbti'ng andt vdi thiinh phan va tinh chat ciing nhu cau hinh khac se dugc phat trien dc dap irng cho nhirng ddi tugng ap dung cu the Andt Ti/lr02(l%o)-Sb205-Sn02 cd qua the thoat dxy cao, phii hgp cho qua trinh dxy hda cac chat huu co ddc hai phenol, chlorophenol va hgp chat thude nd xir ly nude thai Lffi cam o'n Cdng trinh da dugc thuc hien tren co sd kinh phi nghien ciru tii' Chuong trinh nghien ciru Khoa hgc va Cdng nghe cap Vien Khoa bgc va Cdng nghe Viet Nam, cap Nha nude ma sd KC 02.04 Cac tac gia xin chan cam on Eanh dao Vien Khoa hgc Vat lieu da dgng vien vii tao dieu kien thuan Igi qua trinb nghien ciru TAI 10 I I 12 13 14 15 16 LIEU THAM KHAO S Trasatti, Electrochim Acta, 29, 1503 (1984) M Rene, U.S Patent 4,348,268 (1982) Ch Comninellis, C Pulgarin, J Appl Electrochem., 21, 703 (1991) R Kotz, S Stucki, D Scherson, D.M Kolb,,/ Electroanal Chem., 172, 21 (1984) D Gallizioli, P Tantardini, S Trasatti, J Appl Electrochem., 1975, 5, 203 F I line, M Yasuda, T Noda, T Yoshida, J Okuda, J Electrochem Soc, 1979, 126, 1439 N.B Tahar, A Savall,./ Electrochem Soc, 1998, 145, 3427 E Beck, Electrochim Acta, 34, 811 (1989) R Kotz, S Stucki, Electrochim Acta, 1986, 31, 1311 Ch Comninellis, A De Battisti, ,7 Chim Phys., 1996, 93, 673 N.N Phong, Il.r Binh, P.L Cam, Proceed 11"' Asian-Pacif Corr Contr Conf, 1999, 2, 692 C Bock, B MacDougall, Electrochem Soc Proceed., 2000, 4, 369 L.L Houk, S.K .lohnson, J Feng, R.S Houk D.C Johnson, J Appl Electrochem., 1998, 28, 1167 M Galtiell, D.W Kirk,,/ Electrochem Soc 1993, 140, 1534 f.A.I- Ea.ssali, L.O.S Bulhoes, L.M.C Abeid, J.F.C Boodts, J Electrochem Soc 1997, 144, 3348 S Ardizzone, G Fregonara S Trasatti, Electrochim Acta, 1990, 35, 263 27] ... Hon niia, no la phan ung phu khdng mong mudn nhilu qua trinh andt (nhu oxy hoa cac chat hiiu co) Trong tat ca cac trudng hgp tren, viec lira chgn va tim kiem vat lieu anot thich hgp cho tirng qua... cua dien cue anot giam manh Tuy nhien, dang andt gia cdn cao sir dung ham lugng Ir02 cao hon hgp Trong bai chiing tdi mudn gidi thieu mot sd ket qua nghien cuu ve dien cue anot tro dugc che tao... 60''''C 30 phiit va tiy hoa bgc 10% axit oxalic trudc klii tao ldp phii Dung dich phii ciia cac mudi kim loai dugc pha dung mdi n-butanol Trgn cac dung dich cd chira ion Ru vdi ion Ti theo cac ti le