TAP CHI HOA HOC
DOl: 10.15625/0866-7144 2014-0024 T. 52(4)519-525 THANG 8 NAM 2014
T 6 N G Hap VA KHA NANG LKNG DUNG NANOCOMPOZIT
POLYNAPHTYLAMIN/Fe304 TRONG XU U ASEN
Iran Minh Thi'', Vu Quoc Trung^, Pham Van Hoan^ Vii Thi Thanh Hu-ong', Nguyin Minh Tan^
©ao Van BayS Nguyen Quang Tuyen^ Dirong Thi HuySn Hai^ Nguyen Thi Huyen Trang' 'Khoa Vdl ly, Tru&ng Dgi hgc Suphgm Hd Ndi
Khoa Hod hgc. Tru&ng Dgi hoc Suphgm Hd Ngi Khoa Cdng nghi vd Moi tru&ng, Tru&ng Cao ddng Suphgm Hd Ngi
^Vien Ky thudt Hda hgc, Tru&ng Dgi hgc Bdch khoa Hd Ngi Dgn Tda soan 27-3-2014
Abstract
This paper presents the synthesis route, the properties of the polynaphthylamine (PNA)/Fe304 nanocomposites and their adsorption studies of arsenic (III) removal from water. Microstructure and morphology of the nanocomposites with the polymer contents of 0 %, 5 % and 10 % and 15 % have been investigated by measurements: X-ray diffraction analysis (XRD), SEM, TEM, Raman scattering spectram. The studied results showed that the size of nanocomposite particles was about 20 nm. The saturation magnetization of the samples had values of about 45-65 emu/g as measured by vibrating sample magnetometer (VSM). The investigations of isothermal adsorption process and influences of pH to arsenic adsorpUon capacity showed that the nanocomposite materials with appropriate polymer componcriis have good arsenic adsorption ability in water.
Keywords: Fe304, nanocomposite, magnetization, arsenic treatment 1. MO DAU
Vgt li?u nano tir tinh Fe304 pha tgp cac kim logi chuyen tiep dugc quan tfim nghien ciru [1-3] do chung cd irng dyng trong nhieu linh vuc: luu trii thdng tin, myc in, nam cham tir mem, dieu trj ung thu, sieu fim tir tinh,.... Cac hgt nano the hien nhiing tinh chfit dge biet khi di?n tich be mat rieng ciia chiing tang len. Khi dd cac tinh chfit di^n, tir thay ddi dang k^ do hieu irng lugng tu kich thudc hat. Ddng thdi, cfic hgt cd xu hudng chuyen den cac trgng thai nfing lugng ty do cyc tieu qua mgt sd hinh thai nhu:
chuyen pha, mgc mam tir cfic tam ket tinh, thay ddi cfiu triic be mat, ket dam, va hap thy be mat [4, 5].
Cac vgt li?u nano oxit sfit FcsO^ vfi nanocompozit TeyOi [6, 7] dang dugc quan tfim nghien cuu ve cac tinh chat tir, tinh chfit dien vfi cfiu triic vi md ciia chung. H? vgt li?u Fe304 pha tap kim loai chuyen tiep cung dugc quan tfim nghien ciru trong cac ung dgng quan trgng nhu: xii Ii kim loai nang, khir asen [8-10], xii li d nhilm thuoc nhugm [11, 12] trong nudc thfii. Tuy nhien, hi^n nay chua cd cdng Irinh nao cdng bo nao ve khfi nang bfip phy asen ciia vat li?u compozit polyme/Fe304.
Bfii bao nay trinh bay ve che tao, nghien ciru tinh chat tir, cau triic vi md ciia vat lieu nanocompozit polynaphtylamin (PNA)/Fe304 va khao sat sy hap phy As trong trong mdi trudng nudc.
2. THUC NGHIEM 2.1. Nguyen lieu ban dau
Dung dich HCl 37 %, NajSO,, dung dich Nib dam dac, FeCl3.6H20, axeton 99 %, isopropanol (CH3)2CH0H; naphtylamin CjofLNH, 99 %, (NH4)2S20s (APS). Dung dich As(III) goc dugc pha bfing each hoa tan As^O? trong dung djch NaOH 1 % vfi dinh mirc bang nudc cat ve ndng dp I g/L {1 g/L = 10^ ppb, gap 10* lan hfim lugng As cho phep trong nudc sinh hoat do Bp Y te Viet Nam quy dmh [13]).
2.2. Tong hg^p FC3O4
Lfiy 0,85 m'. dung djch HCI I M pha vao irony 100 mL nudc cat dugc dyng trong cdc 250 mL. Can 20,25 g FeCl3.6i LO roi cho vfio dung dich i ICI tren.
khuay cho tan het, ta sc ihu dugc dung djch I (ki hieu ddi). Can chinh .\ac 1,575 g Na.SO) pha vao 50
TCHH, T. 52(4), 2014
mL H2O ta thu dugc dung djch 2 (ki hieu dd2). Trgn 2 dung djch tren vao nhau dugc dung dich 3 (ki hieu dd3) vfi khuay trong thdi gian 20 phiit den khi chuyen sang mau vfing tuai. Nhd tii tir dung dich NH3 vfio dd3 cho den khi pH = 9-10 va khufiy deu trong thiri gian 30 phiit d nhi?t do 80 "C, ket thiic thu dugc dung dich mau den. Phfin irng hda hpc xay ra trong qufi trinh che tao Fe304:
2FeCl3 + Na^SOj + H p -^ 2FeCI, +NajSO, + 2HC1 FeClj + FeCl^ + 8NH3 + 4Up = Fep, i +8NH,CI
Sau khi riia nhieu lan bfing nudc cat va axeton, hgt nano sat tir dugc lam khd trong chan khdng trong 5 gid, ap suat dudi 1 mPa vfi 0 nhiet do -40 °C. Sfin phfim khd nay dugc nghien nhd do Ifi hat nano Fej04.
2.3. Tong hgp nanocompozit PNA/Fe304 Tdng hgp nanocompozit PNA/FcsO^ bang phuong phfip triing hgp tgi chd theo cac budc nhu sau:
- Lay mpt lupng chinh xfic ciia Fe304 cho vao 100 mL nudc cat. Them vao lan lupt 40 mL isopropanol, khdi lupng chinb xac naphtylamin va khuay manh trong 1 gid,
- Nhd tir tir dung djch chira mgt lugng tucmg irng (NH4)2S208 vdi ti 1^ mol giiia monome va tfic nhan oxi hda la 1:1,5. Khufiy manh trong 2 gid, phfin irng tda nhi?t, hdn hgp cd mfiu xanh den.
- Lpc Ifiy phan bgt, sau do say khd bfing may ddng cd Labconco (My) trong 5 gid, fip suat dudi 1 mPa d nhi?t dg-40 °C.
Trong d^ tfii nay, cac mfiu bgt Fe304, PNA, nanocompozit PNA/FesOj vdi cfic ti I? khdi lupng 5
%, 10 %, 15 % dupc ki hieu la Fe304, Mo, M,, M3, M3 tucmg ung nhu trinh bfiy d bang 1.
Trdn Minh Thi vd cgng sif xdp trong cfic mfiu dirge do tren may BET TrIStar 3000 V6.07 A. Vifc phan tich nong dg As trong dung dich bfing may bfip thy nguyen tii (AAS) Shimadzu 6300.
3. KET QUA VA THAO LUAN
3.1. Hinh thai, cau true va iu tinh ciia v^t ii^u Hinh 1 la phd nhieu xg tia X (XRD) ciia cfic mfiu Fe304 vfi mfiu Mi cd cfic dinh nhieu xg triing vdi dinh Clia phd chuan. K8t qufi do nhieu xa tia X cho thay mau tgo thfinh Ifi don pha. Viec bgc polyme khdng xuat hien dinh la chirng td polyme khdng lfim finh hudng den cfiu true tinh the ciia FgjOa. Kich thudc hgt D = 11,24 nm ddi vdi mau Fe304 dugc
kX tinh theo cdng thitc Debye-Scberrer; D =
j8cos0 (A = 0,15406 wm; k = 0,9; S C) lfi gdc iing vdi dinh nhieu xa; |3: dg ban rgng ciia dinh).
Bang 1: Cac mau Fe304, Mo, M Mau
Fe,0, PNA
FejO,, g 20
0 Mo, g
0 3,0
M,,g 20 1,0
,M2, M Mi.g
20 2,0
3
M3, g 20 3,0 Cau true vi mo cua cac mlu dugc khao sat bang cac phep do: phep do nhieu xa tia X tren may SIEMENS D5005 Bruker (Germany) vai 6ng phat tia X bing dong, buoc song K„ = 1,54056 A; chup anh hi6n vi difn tii truyen qua (TEM) tren may JEOL TEM 5410 NV, anh hien vi dien tii quet (SEM) tren may SEM- S4800-NIHE va khao sat tan X9 Raman o buoc song 633 nm, nang luong chiim laze 3 mW, tren may do Ramanlog 91 (USA). Tinh chat tir Clia cac mau dugc do bSng tir ke mlu rung VSM. Di|n tich be mat rieng va kich thuoc cac lo
r a m
;
'•±3
(511 COO) 1
LCAJI
r, o | M. 1
t
1 Hinh I: Phd nhilu xg Romghen cua Fe304 va mfiu M[Phd nhieu xgXRD cua mfiu Mj khdng xufit hi?n dinh Ig so vdi mfiu FesO^, vi polyme la vgt lifu vo djnh hinh. Do dd, ket qua tinh kich thudc hgt 11,64 nm cho mfiu M, tbeo phuang trinh Debye-Schen-er chinh la kich tbudc ciia phan ldi Fe304 cd cau tnic tinh the.
Hinh 2: Anh TEM ciia mfiu M3
TCHH, T. 52(4). 2014 Tdng hgp vd khd ndng img dyng. . Md men tii dugc do bfing tir ke mfiu rung (hinh 5) cho thay, khi dfit mfiu vfio tir trucmg ngofii Idn d nhi?t dg phdng, FesO* thl hien tinh sieu thuan tir vdi luc khang tir vfi dp tir du khdng dfing ke. Ket qufi nay phii hgp vdi cdng bd ciia mgt sd tfic gia khfic [8, 12, 14].
Hinh 4: Phd Ramman ciia mfiu M3
Hinh 3: Anh SEM ciia cfic mfiu PNA/FesO:
(a)M,;(b)M2
Anh TEM cua mau M3 (hinb 2) cho thfiy cd hi$n tugng ty dam cua cac hgt compozit cd ki'ch thudc khoang 17 nm den 19 nm. Nhu vgy, ket qua do kich thudc hgt tir finh TEM Idn bon kich thudc hgt tinh tir phd XRD la phii hgp vfi chirng td cfiu tnic vd - loi Clia vgt li^u nanocompozit.
Cfic hgt nanocompozit trong cfic finh SEM (hinh 3) cung cho thay cac hgt cd dg ddng deu cao vfi khdng cd sy ket khdi polyme rieng re. Dd chinh Ifi cfic hgt nanocompozit do sy bgc phii ctia polyme ben ngofii cfic hgt Fe304.
Pho Ramman ciia mau M3 (hinh 4) cho thay cac pic dge trung cua PNA trong h? PNA/Fe304, trong do pic 1547,8 ciia mau M3 cd cudng dg mgnh iing vdi sd sdng trong khofing 1585-1630 cm"' cua PNA.
Day Ifi tan so dao dgng hda tri tuong iing vdi
C"C(lhiJm)-
Them vfio dd, phd ciia mau M3 cd pic 1497,0 tuong img vdi khofing sd sdng 1480-1516 cm"' ciia PNA d trgng thai oxi hda tuong img vdi tan sd dao dgng hda trj cua nhdm C=N. Nhu vgy, ket qufi phfin tich pho tan xg Raman cho thfiy, PNA da tham gia trong tfinh phan ciia compozit vfi d trgng thai oxi hda vdi cfic nhdm dao dpng dge trung ciia PNA/Fe304 lfi
^-N+. tJC-N. 5c.H-
Cfic ket qua tren chiing td rfing polyme dugc tgo thfinh bfing phfin img triing hgp cfic monome tren be mjt oxit kim logi tgo tbanh cfic bgt nanocompozit.
h—-^^-—
-15000 -10000 -5000 '•000 15000
Hinh 5: Md men tir ciia cfic mfiu Hinh nhd: Luc khfing tur kha nhd Hinh 5 cho thay, khi tang ham lupng polyme trong mau thi md men tir bao hda Mj (irng vdi mgt don vi khdi lugng) ciia compozit gifim. Dieu nfiy dugc gifii thich kbi hfim lugng PNA khdng cd tir tinh trong compozit tang len lfim md men tir Mj ciia compozit gifim di. Dfiy lfi dge diem chung ciia compozit tir ti'nh cd chiia polyme [6].
Khi khdng dimg polyme de bpc phii cfic hgt Fe304, md men tir ciia Fe304 suy gifim tir 63,13 emu/g tdi 56 emu/g sau 2 thfing chg tgo (hinh 6). Sy suy giam nay lfi do vfit lieu Fe304 de dang bi oxi hoa trong khdng khi, tao thanh Y-Fe203 theo phuang trinh:
4Fe304 + O2 + I8H2O ^6Fe203 +I2H2O Do md men tir ciia y-Fe203 nhd hon md men tir Clia FesO^, nen sy oxi hoa Fe^*^ thfinh Fe''' lam tfing ham lupng pha y-Fe203 gay nen md men tir ciia mfiu suy gifim theo thdi gian. Trai lgi, cac hgt nanocompozit PNA/FcjO^ tuy cd md men tir nhd hon FcsOj, nhung sy bgc phu ciia polyme xung
TCHH, T. 52(4), 2014
quanh Fe304 co tac dung lam 6n djnh tinh chit tir ciia vat lieu.
• a Do sau 2 thang
:=J
^ : S = = ^ ' "
Hinh 6: Md men tir ciia Fe304 (a) do sau khi tdng hpp 2 thang;
(b) do ngay sau khi tdng hgp 3.2. Nghien ciru kha nang hap phu asen
De khao sfit khfi nang bfip phu asen, cac vat lieu bfip phy nano Fe304, MQ (PNA), M], M2, Mj vdi khdi lugng 0,01 g dugc sir dung de khu asen trong dung djch gdc cd ham lugng As gfip khoang 20 lfin tieu chuan cho phep (Tieu chufin ciia Bp Y te cho phep ndng dp As tdi da trong nudc sinh hogt la 0,01 mg/L, tuong duong 10 ppb [13]). Dung djch sau khi hap phy dupc phfin tich ndng dd As cdn lgi bang may do phd bfip thu nguyen tir (AAS). Cfic khfio sfit finh hudng ciia hfim lugng polymer, do pH, thdi gian hap phy can bang tdi kha nang hap phy asen dugc tien hanh d nhi?t dg phdng.
3.2.1. Nghien cicu dnh hu&ng cuapH den khd nang hdp phu ciia vdt li^u
Dung dich As gdc gap khofing 10 lfin tieu chufin cho phep (Tieu chufin cua bd y te cho phep trong nudc sinh hogt ndng do asen (III) tdi da la 0,01 mg/L tuong duong 10 ppb) nhu sau:
- Dinh mirc bang nudc cfit 2 lan vdi ndng dp asen Ifi 0,1 mg/L, day la dung dich gdc chufin diing de nghien ciru sy bfip phy trong dung dich cd dp pH khfic nhau.
- Cfin khoi lupng 0,01 g vat lieu hap phu cho vao 100 mL dung dich asen gdc, diing may khuay d6 cac hgt nano tir ti'nh phfin tan deu vao dung dich. Sau mpt khofing thdi gian nhat djnh dimg nam chfim hiit cfic hgt nano tir tinh xudng day cdc. Diing giay Ipc de Igc lfi); phfin nudc d tren dem di phan tich nong dp asen bang mfiy do pho hfip thy nguyen tir (AAS).
Hinh 7 the hi^n ndng dg asen cdn Igi sau khi diing 0,0lg vat li?u hap phy nano FcjO^, Mo (PNA) vfi compozit M|, M2, M3 d6 khu asen trong cfic dung di'ch cd dg pH tir 1 din 14. Ket qufi cho thay, asen bj hap phy mgnh trong dieu ki?n dg pH cua dung djch
Trdn Minh Thi vd cgng sir tir 5 din 7 khi diing cac vgt U?u hap phy M|, M2, FesOj va MQ. D I thfiy rfing vgt ii?u Mj hap phy asen mgnh ban Fe304; ngay cfi polyme PNA la vgt li^u phi tir tinh cung hap phy asen. Dieu do chiing to PNA cd vai trd anh budng tdi khfi nang bfip phy asen trong dung dich. Trong mdi trudng pH == 7, anh hudng ciia dd pH tdi khfi nang hap phy asen cd thl cdn cd nguyen nhan do PNA d trang thai oxi hoa (goc u^ ^J nen nd cd sy ddng gdp ciia ai lyc tuong tac tmh dien giifa vgt li?u, tgo ra sir hap phy cac anion As (III). Khi dung djch cd dg pH cao (vi du pH = 14, hinh 7) asen bj hap phu tren vat li?u rfit kem. Dieu nfiy cd the gifii thich la do khi dpH cao pH > 10, PNA tir trang thai oxi hda chuyen sang trgng thai khir, do dd tuong tfic giira vgt lieu va cac anion As (111) d dang H2ASO3" vfi HAs03^" trong dung djch giam di ro ret (hinh 7). Trong mdi trudng pH < 5 su hfip phy ciia vgt li?u gifim di cd thl do vgt lieu compozit bj phan hiiy mpt phfin trong moi trudng cd tinh axit cao.
Hinh 7: Su phy thudc ciia ndng dg As cdn Igi vao dp pH
De khfio sat dieu nfiy, mpt lugng 1 g cac mfiu Fe304, M3 dugc cho vfio 100 mL dung djch HCl co dp pH = 1; 2 vfi khuay trong thdi gian 20 phiit. Sau khi lpc bd cac kit tiia, hfim lupng ion sat tan trong cac logi chat long nay dugc khfio sat bfing bang may hfip thy nguyen tir (AAS) Shimadzu 6300. Kit qua tinh ham lugng sfit tan trong dung djch HCI nhu trong bfing 2.
Bdng 2: Ham lugng Fe tan trong dung djch
pH 1 2 7
Ham lugng Fe tan (Mlu FejO,)
0,21 ppb 0,13 ppb
-
Ham Itrgng Fe tan (Mlu Mj)
0,17 ppb 0,13 ppb
-
Bang 2 cho thay cd sy phfin irng gi&a Fe304 vdi mdi trudng axit tgo thfinh ion sfit tan trong dung djch. Mac dii ti 1^ suy gifim ciia FcsOj va compozit
TCHH, T. 52(4), 2014
PNA/Fej04 la nhd, nhung day cimg la nguyen nhan din den sy hap phy asen thap trong vimg pH < 5.
Trong khi do, khdng thfiy xufit hi?n sfit tan trong dung djch cd pH =; 7, chiing td cfic vat li?u nay kha ben trong mdi trudng trung tinh (bfing 2).
Trong mdi tnidng kiem, vat li?u FcsOfl vfi compozit PNA/Fe304 kha ben viing, vi the cac ket qufi tren ggi ra phuang phap gifii hfip phy trong dung djch pH = 14 de tfii sir dyng nhieu lan cfic vat Ii?u hap phy.
Thai gian hap phu cfin bfing dugc khfio sat bfing phuong phfip do nong dp asen cdn Igi trong dung djch asen cd dp pH = 7 sau mdi khofing thdi gian khuay khfic nhau (sau 10, 15, 20, 25, 30, 50 phiit) ddi vdi cfic vgt lieu hap phy Fe304, Mo va nanocompozit M|, M2, M3 nhu trong hinh 8. Ket qufi khfio sfit cho thay: sau khofing thdi gian khuay 20 phiit, nong dp asen cdn Igi d trgng thai cfin bang.
Tong /ipp Vfl khd nang ung dung...
Trong dd: Cf - ndng dp luc can bang ciia chfit bj hfip phy (ndng dp asen cdn lgi, mg/L);
q - dung lugng hap phy ciia asen tgi thdi diem cfin bang irng vdi mgt don vi khdi lugng chat hap phy (mg/g);
qmax - dung lugng bfip phu cue dai (mg/g);
b - Hfing sd dfic trung cho tuong tac ciia chat hap phu vfi chat bi bap phu.
Tir phuong trinh nay ta cd the xfic dinh dugc dung lupng hap phy cyc dgi q„a>i-
Cfic ket qua thuc nghi$m dugc trinh bay tren hinh 8 dien tfi sy phu thugc ciia cfic phuang trinh dudng thfing dang y = Cf/q = ax + b. H? so a ciia cfic dudng thang dugc tinh bang phuang phfip binh phuong tdi thieu, tir dd tinh dugc dung lugng hfip phy cyc dgi q^^^ dng vdi cfic mau hfip phy Fe304, Mo (PNA) va compozit Mt, M2, M3 dugc neu trong bang 3.
3.2.2. Dung lugng hdp phu cue dgi cua vgt lieu
Ttr cfic phan tich tren, sy hfip phu asen trong mdi trudng pH = 7 dugc cho Ifi phii hop md hinh Langmuir, tuong ty nhu hap phy nita d nhi?t dp "77 K. Bfing cfich sir dyng md hinh nay, dung lugng hap phy asen q tai thdi diem cfin bfing d dp pH = 7 ciia cac vgt li?u FcaOrt, Mo (PNA) va nanocompozit Mi, M2, M3 ling vdi mgt don vj khoi lupng chat hfip phy (mg/g) dupc tien hfinh tren may do phd hfip thy nguyen tii (AAS).
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Hmh 8: Xfic djnh thdi gian cfin bfing cua ndng dp As
Phuong trinh dfing nhi?t hap phy Langmuir cd
' 9.„ ' ^•^...
D$t y = -^\ jr = C / ' do thj cua phucmg trinh cd 1 . 1 dgng y = ax + c; vol 9 „.. = —; o
Hinh 9: Dudng dang nhi?t hap phy Langmuir ciia cac mau Bdng 3: Dung lugng hfip phy cyc dgi vfi md men tir bao hoa ciia cfic mau tuong iing V^t li?u
Fe304 Mo M, M2 M3
Mo men tir bao hoa, emu/g 63,13 0,00 58,38 56,73 43,43
^TO, ""S/g
32,873 23,447 46,9704 37,7358 20,2675 Cfic kit qufi thu dugc trong bfing 3 cho thfiy khfi nang hfip phy asen cua cfic vgt li?u dugc xep theo thir Ml, M2, Fe304, Mo, M3, trong dd q^ax ciia vgt li?u Fe304 Idn ban ket qufi thyc nghi?m trong tai li?u [8] d ciing dieu ki$n dung dich cd pH = 7. Ket qufi phan loai vgt lipu tir bang 3 cung phii hgp tot vdi cac kit qua thyc nghi?m trong hinh 7 umg vdi dp pH
^ 7 ciia dung dich.
TCHH, T. 52(4), 2014
3.2.3 Dgng lyc hgc cua hdpph{i asen
Cfic kit qufi thuc nghi?m cho thay rfing ngay ca vgt li^u polyme phi tii tinh cung hfip phu asen, dieu dd chiing td tinh chfit til ciia vat lieu khdng quyet dinh kha nfing hap phy asen. Bfing viec khao sat sy hfip phy cua cac mfiu dgi difn Fe304 va Mi ddi vdi nito d 77 K dl khao sfit di?n tich be mfit rieng vfi tinh xdp Clia vat lieu. Dudng cong trong cfic hinh nhd ciia hinh 10 vfi 11 the hi?n cac dudng hfip phy dang nhi?t vfi gifii hfip phy d vimg ap sufit ti ddi cua nitop/po = 1 Ket qua do di?n tich be mat rieng cua Fe304 vfi M| vfio khofing 100,2 mVg (bang phuang phfip BET-Brunauer, Emmett, vfi Taller) [12], vfi kich thudc Id xdp trong khofing 15-20 nm iing vdi the tich hfip phy Idn nhfit cua Id dugc tinh bfing phuang phfip BJH (Barrett, Joyner vfi Halendar).
Mat khfic, sy phii hpp giira cfic kit qufi thuc nghiem d dp pH = 7 diing phuang trinh dang nhi?t Langmuir trong hinh 9 cho phep khfing djnh rang tinh xdp cua vat Ii?u nano vfi di?n tich be mat rieng ciia cfic hgt cd anh hudng chii ylu din khfi nang hap phu ciia vgt li?u Fe304 va cac compozit PNA/Fe304.
O.DIi CO 010
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5 0 0 0 4 0 002 oooo
1 \ V-
« \ \
fl
^ " = = ^ ^
"
"
Kich thuoc IA bung blnh D (nm)
Hinh 10: Phan bo Id xop theo kich thudc Id trung binh Clia mfiu Fe304. Hinh nhd: Cfic dudng dfing
nhi?t hap phy vfi gifii hfip phy
Kich thuoc la tmng blnh D (nm) "
Hinh 11: Phan bd Id xdp theo kich thudc Id trung binh Clia mfiu Fe304. Hinh nhd: Cac dudng dfing
nhi?t hfip phy vfi gifii hap phy
Trdn Minh Thi vd cgng syr Cac kit qua th^c nghiem vfi phan ti'ch tren cho thfiy, chinh tucmg tfic trao ddi nang lirgng khdng dan hdi giiia vgt lieu xdp cd dien ti'ch bS mgt rieng vdi chfit bj hap phy xay ra d be mat cfic hgt nano cd finh hudng chii yeu tdi kha nang hfip phy cua chiing.
4. KET LUAN
Vfit li?u nanocompozit PNA/Fe304 da dugc chl tao thanh cdng vdi cac thanh phfin polyme khac nhau. Cfic mau nano Fe304 vfi PNA/Fe304 deu co kha nfing hap phy asen(lll) tot, nhung cfic nanocompozit Mj, M2 cd kha nang hap phu asen tdt hon Fe304. Dieu kien tdi uu de tien hfinh qua trinh hfip phy asen(III) Ifi pH = 7 vfi thdi gian bfip phy la 20 phut. Dgng luc hgc cua su hap phy asen dugc gifii thich dua tren ca sd cfic qua trinh dang nhiet hap phy Langmuir tren be mat cac hgt nano ciia cac vat lieu xdp. Day la nguyen nhfin chii ylu quylt djnh kha nang hap phy asen. Vat lieu cd kha nfing gifii hap phy tdt d pH = 14 vfi cd kha nang tfii sir dung cao.
Ldi cam on: Cdng trinh dugc su hd trg de tdi trgng diim cdp Tru&ng DHSP Hd Noi, md sd SPHN 13- 361TD.
TAI LIEU THAM K H A O
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Tong hap vd khd ndng ung dung..
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13. Bo Y tl. Quy chufin kJ thuat qudc gia vS chSt lugn^
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Lien h4: Tran M i n h T h i K h o a Vgt ly,
T r u d n g Dai hgc S u phgm Hfi N g i 136 X u a n T h u y , C a u Gifiy, Ha Npi Email: t r a n m i n h t h i @ h n u e . e d u . v n .
