T A P CHI H 6 A HOC T 50(4)476 481 THANG 8 N A M 201^ XAC DINH CAC THONG S6 H 6 A LY CUA V A T L I | U H A P PHU TREN c a sdy Fe(OH)3, SiOz, SAT K I M LOAI VA K H A N A N G U''''NG DyNG Di X(y LY 2,4,6 T[.]
TAP CHI H6A HOC T 50(4)476-481 THANG N A M 201^ XAC DINH CAC THONG S6 H A LY CUA V A T L I | U H A P PHU TREN c a sdy Fe(OH)3, SiOz, SAT K I M LOAI VA K H A N A N G U'NG DyNG Di X(y LY 2,4,6-TRINITROTOLUEN NHieWI TRONG H\f6C Nguyen Hodi Nam'', Tran Vfin Chung\ D Nggc KhuS' ' Vien Khoa hgc Vgt li^u Vi^n Khoa hgc vd Cdng ngh^ Viet Nam 'Vi?n Hda hgc Vgt lieu Vien Khoa hgc vd Ccmg nghe Qudn su H'HVJ Cdng nghe mdi Vien Khoa hgc vd Cdng nghe Qudn su Den Tdasogn 16-4-2012 Abstract The adsorbents based on Fe(OH)j using for water Ircatment were prepared The physic-chemical characterizationof these adsorbents was performed by advanced techniques such as SEM, IR, and BET The clement compositicHi of adsorbent was analysed by EDX The examination of morphology by RXD and SEM showed that all materials were amorphous The EDX and IR results confirmed the presence of Si on the 2TPI0 and 3TP10 samples The surface area measured by BET technique showed that samples were mesoporous materials The average pore size of all samples was less than 10 nm The specific surafe area of ITP, 2TP10 and 3TP10 samples was 240, 270 and 350 mVg respectively Tlie effectiveness in 2,4,6-Trinitrototuen (TNT) removal of 3TPI0 sample was more than 95% and remained TNT concentration in the solution after treatment was low Based on the achieved results, it can be concluded thai 3TP10 material is a promised material that can be used to remove dissolved TNT in contaminated water Keywords: Adsorbent, Fe(0H)3, SiO;, ZVl, TNT, contaminaed water l.GlOlTHieU Hang ndm, mdt khoi lugng Idn thuoc nd nitro thom cd 2,4,6-trinitrotoluen (TNT) dugc sir dung cho cac hoat dgng sdn xuat qudc phdng va dan su [1] Day chinh la nguon tgo nude thai bj nhilm TNT Tiiy thugc vao nong dg TNT cd nude thai ma chiing dugc phdn logi thdnh nude thdi dd, vang vd hdng [2] Nude thdi chua TNT neu khdng dugc xu ly sg gdy d nhilm cho ddt vd ngudn nude ngdm, sau dd se anh hudng tdi sire khde cua ngudi vd gay nen mgt sd tdc dgng xau tdi mdi trudng TNT thudng phdt hi?n thay nude ngam tgi cac no! co nha mdy chi biln, kho ddng gdi va luu giu thuoc nd [3J TNT la chat dgc cd the gdy ung thu vd Id chdt ben va khd phdn hiiy mdi trudng tg nhien D I loai bd TNT vd cdc chit dgc hihi co khdc nude thai, cd the dp dyng mgt sd phuong phdp nhu hdp phy bdng than hogt tinh [4, 5], chiel tdch [6] oxi h6a xue tac va oxi hda ndng cao sir dyng tia UV va hydro peroxit [7, 8J, phdn hiiy sinh hgc [9J vd khii bdng sdt hodc kem kim logi [lOJ Hi?n nay, phuong phdp xu ly TNT dugc dp dyng biln nhIt Id hap phy bdng than hogt tinh Tuy nhien xir ly bdng than hogt tinh thi gia thdnh dau tu ban ddu ldn vd vi?c hodn nguyen than dd qua su dyng rat phiic tap [7J Neu su dyng phuong phdp khii bdng sdt kim lofii thi hi^u qud xir ly phy thugc vdo dien tich be m^ tiep xiic cua sdt md dign tich be mdt rieng ciia sat kim logi lgi rlt nhd [1IJ Do dd v i ^ tim kiem cac phuong phdp vd v§t li?u thay the khdc cd gid r£ vd sir dyng cdc logi v^t h^u sin de xii ly logi bo TNT nhilm nude Id hit sire cin thiet Bdi bdo ndy gidi thif u ket qud n^ien cira xie djnh cdc thdng s6 hda ly co ban ciia vdt li^u tren co sd Fe(0H)3 vd m^t sd phy gia chiing tdi che tgo or dilu ki?n nude vd ddnh gid khd ndng dp dung de xir ly TNT nhiem nude ciia vgt li?u THgCNGHl$M 2.1 Hda chat D I che tgo vdt li?u hap phy, dd sii dyng dung djch FeCla n6ng dO 0,1 M dugc pha tir FeCl3.6H20 (PA) Chit kilm ddng dl kit tua mu6i sdt Id dung djch NH^OH 25% (PA) Ngu6n silic dugc lay tir dung djch natri silicat 200 g/L pha tir Na2SiO3.9H20 bgt (PA) (ty 1$ NaiO/SiOj = 11,03±0,03%) vasfl kim logi dgng bOt ciia Trung Quoc Todn bg cdc nil nghi?m deu sii dyng nude khu khodng (Dl) TCHH.T 50(4), 2012 2.2 Thilt bi Trong nghien cuu ndy dd sir dyng m^t s6 thilt bj bao gom: Thilt bi nhilu xg tia X logi D8 Advance Bruker AXS thuOc phdng thi nghi?m trgng dilm ciia Vi^n Hoa hoc Cdng nghiep Vi§t Nam Kinh hiln vi difn tir qu^t (SEM) phan gidi cao Hitachi S-4800 thu^c phdng thi nghi?m cua Vi?n V§ sinh Dich tl Hd NOi vd kinh hiln vi dign tir JEOL JMS 6490 ddt tgi Trung tdm Ddnh gid Hu hdng V§t lieu cua Vien Khoa hgc Vdt Ii?u, Vi^n Khoa hgc vd Cong nghe Vi?t Nam Thilt bj Micromeritics Accusorb 2010 surface area analyzer ciia khoa Hda hgc, Trudng Dgi hgc Su phgm Ha NOi 2.3 Phirong phdp Thanh phin pha ciia cdc mdu thi nghifm dugc phdn tich b^ng thiet bj nhilu xg tia X Anh SEM dugc quan sdt tren dnh hien vi dien tir quel phdn gidi cao Thdnh phdn hda hgc cua vgt liOu dugc phdn tich bdng ky thugt EDX Dien tich be m$t dugc bdng su hap phy nito d 77 K tlieo phuong phdp BET Che tao vat li^u: Qui trinh chi tao vat lieu hdp phu dua tren nguyen ly ciia phucmg phap Schwertmann va Cornell [I2J de xuat Qui trinh tiln hanh nhu sau: diing pipet ldy mgt lugng nhdt djnh dung dich natri silicat 200 g/L cho vdo cdc nhga (ddi vdi mau can cd them phy gia la Si02), lay mdt the tich da dinh NR|OH vd trOn vao dung dich natri silicat Can 27 g FeCl3.6H20 pha vao nude vd chinh thdnh lit sau dd cho tir tir dung djch silicat kilm da chudn bi tir trudc vdo, vira cho vao vira khudy Sau kit thuc viec cho silicat kilm thi tilp tuc khudy hdn hgp phdn ung them gid n&a rdi dk yen hdn hgp phan dng binh phdn irng de gid hda Sau gia hda, diing nude Dl dl riia gan ket tiia cho tdi hit vlt cr Lgc thu lly kit tua sau dd thSm bOt sdt kim loai vdo (ddi vdi mlu cdn cd them phu gia la sat kim loai) rdi tiln hdnh tgo hgt vd ldm khd Cac mdu vgt li?u hap phu trSn co sd Fe(0H)3 dd dugc che tao phdng thi nghi$m de phuc vy cho nghien cuu gdm cd: ' Vdt lieu hip phy Fe(0H)3 khdng cd phu gia (k^ hieu ITP) Vat lifu hip phu tren co sd Fe(0H)3 cd chiia phu gia Id 10% slOi (ky hif u 2TPI0) Vat li$u hip phy trgn co sd Fe(0H)3 cd chiia phu gia Id 10% Si02 cimg vdi 10% sdt kim logi (k^hi6u3TP10) Qui trinh ddnh gid khd ndng xir ly TNT cua vdt li^u nhu sau: cho 100 mL dung dich TNT ndng dO khodng 50 mg/L dd chlnh pH - vdo binh ndn 125 Nguyen Hoai Nam vd cgng su mL, cho vdo moi binh g vgt li?u sau dd dgt ISn mdy ldc vd ldc d t6c dO 150 vdng/phiit 12 gid Sau dd lay mdu phdn tich ndng dO TNT cdn Igi dung djch KET QUA VA T H A O L U A N 3.1 Ket qud ddnh gid cdc thdng so hda ly ciia vdt lifu 3.1.1 Kit qud phd nhieu xg tia X Cdc mlu vgt lieu cd ty I? Si02/Fe(OH)3 khdc lir 0% din 20% khoi lugng vdi miic dg thay doi Id 5% da dugc thgc hi?n d6ng thdi vdi ciing cac dieu ki^n thi nghiem nhu Ket qud phan tich nhilu xg tia X (hinh 1) cho thay m$c dii cd su khac vl t^' 1$ Si02/Fe(OH)3 nhung hinh thdi hgc ciia cdc vdt li§u hodn todn khdng khdc Tit cd cac mdu dIu Id dgng vd djnh hinh vd khdng mdu nao xuat hifn dinh thi hi?n sg cd mdt cac dang tinh thi ciia Fe(0H)3 II (a) (b) Hinh 1: Ket qua nhieu xg tia X cua mau (a)lTPva(b)2TP10 Ket qud phan tich phd nhieu xg tia X ciia cdc mdu md phan cd them bdt sat kim logi vdi ty le tir 0% den 10% khdi lugng cho thay hinh thdi hgc ciia vgt lieu van la dgng vd djnh hinh Mgc dii ty le sdt kim logi cac mdu cd khdc nhung anh phd thu dugc khdng cd su khdc biet 3.1.2 Kit qud dnh hiin vi dien tii quit (SEM) Cdc mlu vgt li$u cd ty le thdnh phin vd phu gia khdc da dugc chup anh cdu triic bl mat b4ng hien vi di?n tir quet phan giai cao Tren hinh Id dnh SEM ciia mlu vat lieu vdi ty 1? thdiih phdn khac Qua dnh SEM thu dugc thdy rdng vdi thdnh phan khdc ciia cac mdu vdt li?u thi cau triic xop cua chiing ciing hodn toan khac Tir dnh SEM ciia mlu ITP cho thdy cac hgt rlt nhd kit khdi vdi nhau, ddng thdi cd cac khe trdng nhd giOa cdc khdi Trong dd, mlu 2TP10 lgi cd hinh dnh khac hdn vdi cdc tinh thi dgng hiiih cdu to hon vd cung kit khdi vdi tgo mgt bS mat Idi 15m CLing vdi cac khe trdng ldn gi&a cdc khdi Hinh dnh ciia mlu 3TP10 thdy rlt rd cac tiiih thi ldn kit lgi vdi tgo nen bl mat Idi lorn ddng thdi ciing tgo cac khe nhd giira cdc tinh thi Trong ca hinh dnh dIu cho thdy cdc khe trdng khdng ddng nhdt nhien mdu 3TP10 cd nhilu khe tr6ng hon cd TCHH, T 50(4), 2012 Xdc dinh cdc thdng sd hda i 3TPI0 2TP10 ITinh Anh SI-^M cita cac mlu v^t li?u dd che Igo 13 Xdc dinh thdnh phdn vdi lieu bang ky thugt EDX Kel qua phdn Ifch IR cita cdc mau thi nghiem dugc irinh bdy trfin hinh vd ,| Khi so sdnh IR ciia mau ITP vdi ph^ chum ciia fcrrihydrit cdng bo ctia Cornell [14J thiyf ring tin higu tuong doi giong Cd dnh pl^ dcu xuli hi?n tin hi?u mgnh d viing 1400 cm vi 1600-1700 cm'' Ngodi ra, tren dnh ciia mlu Fe(0H)3 thi nghiem cd thay xual hi?n tin hi?u mgnh vd viing pic rgng d khodng 3100-3450 cm'' Ty 1? ciia cdc hgp phan vyi ll?u dd dugc tinh loan theo ly Ihuyll trudc thgc hi^n chc tgo vat li?u Tuy nhien de khdng djnh sg cd mjil cua cdc nguyen lo cd irong vgt li^u Ihl sdn phim dd dugc phdn tich \ac djnh lgi thdnh phan bdng phuong phdp EDX tren thiet bj hien vi dign lir quiit Do so li?u kcl qud phdn tich EDX ciia cdc mau thudng rat nhicu vi vgy khudn khd ciia bdi bdo chiing toi chi trich dan tdm tit ket qud phdn tich I£DX ciia mau 3TP10(hinh3) Vy 3600 3100 2600 2100 160O ^ 1100 600 Hinh Anh phd IR ciia mlu ITP Hinh 3: Pho EDX ciia mdu 3TPI0 Tir ket qua phan tich phdn hda hgc ciia cac mlu vat li?u bing EDX dd xdc nhgn dugc sg cd mjt ciia cac nguyen td nhu Fe, O, Si Ngodi ra, mgt sd mau c6n phat hien thIy cac tgp chat khdc nhu Al hay CI Sg cd mdt ciia cdc tap chit ndy cd thi sg nhiem tgp vd tinh qua trinh chi tgo nhu vdi CI Id qua trinh rira chua hodn loan tri?t dl Thong thudng phuong phdp EDX dugc sir dyng de xac_ djnh ban djnh lugng thdnh phan nguyen to cua mau chit rin va cung nhdm xdc djnh sg cd m$t hay khong ciia cac nguyen to mdU: Do dd nghieii cuu chiing tdi sii dyng phuong phdp nhdm khdng djnh lgi phdn nguyen to ciia cac mau dd chi tao Cdc tin hi?u phd mgnh thu dugc d budc song 3450 cm" vd 1620 cm"' la ciia phdn tii nude Sued m^t ciia nude mdu mgt phan la bdn than vat li?u dd hap phy nude ben nd, mat khac la dnh hudng tir phuong phdp IR vi kj thuat n^y thudng sir dyng KBr ma chat ndy rat dl hip phy nude tir khdng Cdc ket qua ndy cung phu hgp vdi cdc kit qud md Jambor [13J vd Cornell [14J dfi cdng bd Ket qua phd IR cua cdc mdu cd phan khac dugc dan tren hinh Cung tucrng tu nhir mau phdn, ket qua IR thu dugc ciia cac mlu vd thdnh phin cung cd cdc tin hi?u mgnh b vimg 1400-1600 cm"' vd 3100-3500 cm' r\^ ••* ••.>*• ZTPIO 3TP10 3.1.4 Kit qud phdn tich phd IR 3600 Cac mlu nghien ciru sau dd dugc phdn tich IR de so sdnh vdi ph6 chudn ciia cdc dgng Fe(OH)j 4"^ 3100 2600 2100 1600 1100 W Hinh Anh ph6 IR ciia cdc mlu vgt li^u cd thdnh phin Si02 khdc TCHH.T 50(4), 2012 Nguyen Hodi Nam vd cgng su Ngoai ra, tin hiOu mgnh d viing 800-1000 cm'' cdn thi hi^n sg cd m$t cda silic cdc mau dd phdn tich Tr6n kit qud phan tich vgch phd thu dirge cd the nh§n thay ty If Si02 cdng cao thi tin hi?u phd cdng mgnh d6ng thdi cdc dinh cung cd xu hudng djch chuyln vl viing budc sdng ldn hon Cdc kit qua thu dugc hodn todn phii hgp vdi cdc cdng bd ciia Jambo vd cdc tdc gid khac [13, 15] Tuy nhien so vdi phd chuan cua Si02 tinh khiet {X = 1080 cm"') thi cdc vgch phd cd budc sdng hip phy thap hon, dilu ndy dugc ly gidi Id cd sg dnh hudng cua nguyen t l Fe vgt lifu va kit qud ndy cung phii hgp vdi cdc kit qua dd cdng b6 cua mgt s6 tdc gid [13,14,16J hi§u img thdt niit cd chai giiia kich thudc vi mao qudn vd mao qudn trung binh Ddng nhiet hap phy ciia mdu 2TP10 cd khodng tri khdng Idn nhu ciia 3TP10 dilu ndy chiing td rdng mdu 3TP10 cd nhilu mao quan nhd hon Dogn dudng cong ddng kfn ciia dudng gidi hip phy khdng ddc nhilu chiing td mire dp ddng nhIt vl dudng kinh ciia cdc mao qudn khdng cao vd dilu ndy cung dugc tdi khing dinh thj sg phan b6 kich thudc mao qudn d hinh dudi ddy Sg phdn b6 kich thudc mao qudn ciia cac mlu ITP vd 2TP10 (hinh 7) khd gilng va trai rgng viing kich thudc nhd ciia logi xdp trung binh Tuy nhien, khdc vdi mlu cdn lai, sg phan bo dudng kfnh mao qudn ciia mlu 3TP10 thi lgi tgp trung 3.1.5 Xdc djnh diin tich be mgt rieng bdng phuong mgt khodng kfch thudc h?p hon Dieu ndy cung da dugc thi hif n rlt rd tren dnh SEM ciia cdc mlu d hinh phdp BET Nhu vay kfch thudc mao quan ciia mdu ITP cung DiSn tich bl m^t vd kich thudc mao qudn trung ldn hon so vdi mau 2TP10 vd 3TP10 Ket qua phan binh ciia cdc mlu th( nghiem dd dugc xdc djnh bdng tich cua cdc mlu thi nghi?m thu dugc ciing phu hgp phuong phdp BET Cdc kit qud di§n tich bl m§t vdi cdc cdng bl ciia cdc tdc gid khdc [I7-20J BET va sg phdn b6 kich thudc mao qudn cua cdc Bdng 1: Di?n tich bl mdt vd kich thudc mao quan mlu dugc trinh bdy tren hinh 6, vd bdng ciia vgt lieu cd phan khdc 400 350 • £ 300 V: ^ 250 •h E 2O0 Loai mau *^^^^ | , ITP 2TP10 3TP10 Ferrihydrit ri6,171 Oxit sat (III) 118] Hydroxit sSt (111) dans hat 119] • | - 100 50 i") 02 0.4 0.6 Ap saai urmg 4di (p/p°) 1- Hinh 6: Dd thi hdp phy Nj bdng phuong phap BET ciia vdt lieu 3TP10 Di?n tich hi m§t BET, mVg The tich mao quan, cmVg 242 270 350 0,319 0,227 0,569 Kich thuac mao quan trung binh, nm 5,2 3,0 3,5 100-700 140-186 200-300 2,9-5,3 0_1 T |008 S 006 3.2 Ket qua t h i nghiem danh gia kha nang ijrng dyng vat li§u tren cof sir Fe(OH)3 d^ xir ly nir*c nhiem TNT - 2rpio — — 3TP10 }oM Birang klnb tningbUib (nm) Hmh 7: Do thi phdn bo kich thudc mao qudn ciia cdc mdu cd phdn khdc Tit cd cdc mdu thi nghiem dlu o dgng ddng nhi$t hap phu kilu IV vdi mOt khoang tri ddng nhiet hdp phu D^c dilm ndy ciia cdc chdt d dgng mao quan trung binh cho thay sg ngung ty mao qudn cd D8 dinh gid kha ning ling dung ciia vat liSu chS t?o duoc cho vi§c xii ly TNT mdi truimg nuoc, dS tiSn hanh th^c nghijm xii ly 100 mL dung djch TNT n6ng dp khoang 50 mg/L o pH - theo nhu qui trinh da nSu phSn phuang phap Tren hinh va dual dSy trinh biy ket qua so sanh va danh gid hiSu qua xii ly TNT nhilm nuoc bang lo?i vat lieu hap phu duoc khao sat KSt qua thvc nghi?m cho thjy kha nang xii ly ctia vjt liSu 3TP10 cao hem han doi vol v$t lieu ITP va 2TP10 H4m lucmg TNT dung djch sau xir ly bang vat li?u ITP va 2TP10 rlt cao; d6 sau xii ly bang vjt lieu 3TP10 thi n6ng,do 479 Xdc djnh cdc thdng so hda ly T C H H T 50(4), 2012 S g cd m$t ciia cdc nguyfin t6 v§t li§u bao g6m Fe, Si vd O d u g c khitng djnh qua k i t qud kilm tra thdnh p h i n nguyfin t6 bdng E D X D ^ n g thdi kit qud ndy cQng d u g c k i l m c h d n g vd th6ng nhIt vdi ph6 IR Di^n tich b l m j t rifing ciia cdc m l u khd ldn Tal cd cdc m l u d l u cd di§n tich > 240 mVg, d6 m l u T P I cd di§n tich b l m$t riSng ldn hon cd, kit qud ndy cQng phii h g p vdi cdc c d n g b6 cda cdc tdc gid khdc- S g phdn b6 kich t h u d c l5 x6p vd t h i tfch il x6p cho thIy cdc m l u v§t li§u d dgng cd miic dO xop trung binh K i t qud ddnh gid khd ndng xir IJ log! bd TNT cua v§t li§u dd c h i tgo c h o t h I y logi vgt li^u ba thdnh p h i n (3TP10) cd uu t h i vugt trOi v l khd ndng xir \^ T N T n h i l m mdi trudng n u d e TNT dung djch c6n rat thap MSug^c Hinh N ^ n g T N T dung djch sau xCr ly bang v5t li;u h i p phvi: ITP, T P I v4 3TP10 l Ldi cdm o n : Cdc tdc gid Iran trgng cdm an sttt hd trg cua QuS> phdt triin khoa hgc vd cdng nghe quSc gia (NAFOSTED) TAI L1$U T H A M K H A O Hinh 9: So sanh hi^u suat xir ly T N T nhiem nude ciia logi vgt li?u h i p phy tren nen Fe(0H)3 Hi?u sudt xii ly T N T ciia cdc loai vdt li?u h i p phy cd thdnh phdn khdc d u g c trinh bdy tren hinh Qua ket qud thi nghi?m Ihly rdng hi?u s u i t xir ly TNT ciia vgt lieu 3TP10 cao hon ddng k l so vdi vat lieu I T P vd 2TP10 Hi?u s u i t xir ly "TNT CLia vgt Ii?u I T P chi dgt dugc miic Id % , cdn 2TP10 la 6%; vdi vgt li?u T P I cd the dgt dugc hi?u suit xii ly ldn hon % Tir cdc k i t qud khdo sdt budc d l u ndy cd t h i nhdn thay vdt li^u h i p phy tren c o sd Fe(0H)3 dugc bd sung cdc phy gia Id Si02 vd sdt kim logi Id mgt logi vat lieu h i p phy cd t i l m ndng d l img dyng cho viec xir ly logi bd T N T bj nhiem cac nguon nude Kaidar, D.H Eric, C Michel, B Alain Applicadon of advanced oxidation processes for TNT removal: A review Journal of Hazardous Materials, 178, 10-28 (2010) Q L Zhao, Z F Ye, M H Zhang Treatment of 2,4,6-trinitrotoluene (TNT) red water by vacuum distillation Chemosphere, 80, 947-950 (2010) D Bruns-Nagel, O Drzyzga, K Sleinbach, T C Schmidt E VonLow, T Gorontzy K H Blotevogcl, D Gemsa Anaerobic/aerobic composting of 2.4,6trinitrotoluene-contaminated soU in a reactor system, Environmental Science and Technology, 32(11), 1676-1679(1998) Rajagopal, J C Kapoor Development ofadsorptive removal process for treatment of explosives contaminated wastewater using actuated carbon Joumal of Hazardous Materials, B87, 73-98 (2001) V Marinovic, M Ristic, M Dostanic Dynamic adsorption of trinitrotoluene on granular activated carbon Joumal of Hazardous Materials B117, 12!128(2005) T F Jenkins, P H Miyares, K F Myers, E F McCormick, A B Strong Comparison of solid phase extraction with salting-out solvent extraction for preconcentration of nitroaromatic and nitramiite explosives from water Analytical Chimica Acta, 289, 69-78(1994) R A l n a i ^ , A Akgerman Oxidative treatment of explosives contaminated wastewater Water Research 33,2021-2030(1999) K Scheck, F H Frimmel Degradation of phenc^ and salicylic acid by ultraviolet radiation/hydro^M peroxide/oxygen, Water Research, 29, - ^ (1995) KET LUAN Da che tgo dugc cdc logi vgt li^u hap phy tr6n c o so Fe(0H)3 cd chira phy gia Id Si02 vd sdt kim logi, ddng thdi xac dinh dugc mgt s6 thdng sd hda ly c o bdn ciia chiing _ K i t qua phdn tich cho thdy hinh thdi hgc ciia cdc m l u vat li?u vdi thdnh phdn phy gia khac d l u gidng va la dgng vd djnh hinh Cau triic mao qudn cua cdc mau vdt lifu dugc t h i hi?n r l t rd tren cdc anh SEM, so dd vgt li§u hap phy phan la v§t li§u mao qudn n h I t vd cdc Id mao qudn dong d l u hon cd 480 TCHH.T 50(4), 2012 P Hwang, T Chow, N R Adrian Transformation of trinitrotoluene to triaminotoluene by mixed cultures incubated under methanogen conditions Environmental Toxicology and Chemistry, 19, 836841 (2000) 10 R Hemandez, M Zappi, C Haikuo Chloride Effect on TNT degradation by Zerovalent Iron or Zinc during ater Treatment, Environmental Science and Technology, 38, 5157-5163 (2004) i l X Zhang, Y M Lin, X Q Shan Z L Chen De^adation of 2,4.6-trinitrotoliiene (TNT) from explosive wastewater using nanoscale zero-valent iron Chemical Engineering Joumal, 158, 566-S70 (2010) 12 U Schwertmann, R M Cornell Iron oxides in the laboratory VCH Publishers New York (1991) 13 J L Jambor, E, D Dutrizac, Occurrence and constitution of natural and synthetic ferrihydrite, a widespread iron oxyhydroxide Chemical reviews, 98,2549-2586(1998) 14 R M, Cornell and U Schwertmann The iron oxides - Structure, Properties, Reaction Occurrence and Uses, Wiley-VCH, Germany (2003) 15 P J Swedlund G M Miskelly, A J McQuillan Lien he: Nguyen Hoai N a m Vien Khoa hgc Vgt li^u, Vi?n Khoa hgc vd Cdng ngh^ Vi$t N a m 18 Hoang Q u d c Viet, Cdu Gidy, Ha Ngi Email: namnh@ims v a s t ac.vn Nguyen Hodi Nam vd cdng su Sdicic Acid Adsorption and Oligomerizalion at the Ferrihydrite-Water Interface: Interpretation of ATRIR Spectra Based on a Model Surface Structure, Langmuir 26, 3394-3401 (2010) 16 Doelsch, W E E Stone, S Petit A Masion, J Rose, J Y Bottero, D Nahon Speciation and Crystal Chemistry of Fe(III) Chloride Hydrolyzed in the Presence of SiO./ Ligands Characterization of Si Fe Aggregates by FTIR and " / Solid-State NMR, Langmuir, 17 1399-1405 (2001) 17 W J Thomas, B Crittenden, Adsorption technology and design Elsevier Science & Technology Books (1998) 18 R Matta, K Hanna, T Kone, S Chiron, Oxidation of 2.4,6-trinitrotoluene in the presence of different ironbearing minerals at neutral pH, Chemical Engineering Journal, 144, 453458 (2008) 19 Le Zeng A method for preparing silica-containing iron (III) oxide adsorbents for arsenic removal Water Research 37, 4351-4358 (2003) 20 M Streat, K Hellgardt, N L R Newton Hydrous ferric oxide as an adsorbent in water treatment Process safety and environmental protection, 86, -9 (2008) ... gan ket tiia cho tdi hit vlt cr Lgc thu lly kit tua sau dd thSm bOt sdt kim loai vdo (ddi vdi mlu cdn cd them phu gia la sat kim loai) rdi tiln hdnh tgo hgt vd ldm khd Cac mdu vgt li?u hap phu trSn... ciia cdc mdu md phan cd them bdt sat kim logi vdi ty le tir 0% den 10% khdi lugng cho thay hinh thdi hgc ciia vgt lieu van la dgng vd djnh hinh Mgc dii ty le sdt kim logi cac mdu cd khdc nhung anh... review Journal of Hazardous Materials, 178, 10-28 (2010) Q L Zhao, Z F Ye, M H Zhang Treatment of 2,4,6- trinitrotoluene (TNT) red water by vacuum distillation Chemosphere, 80, 947-950 (2010) D Bruns-Nagel,