Chuyen san Khoa hpc Tu nhien
KHAO SAT KHA NANG HAP PHU PHENOL DO \ A Mn(Il TRONG M OC B.\NG VAT LIEl' CTAB/AL-BENTONH '
TrSn Thi Xuan Mai', Tran \l?t Dung^ va BCii Van ThSng'"
'Tru&ng Dgi hpc Ddng Thdp
•Tru&ng Tnmg hpc pho thong Thdp Mum
"Tac gia lien he: hvihanga dthu edu.vn Lich sir bai bao
Ngdy nhgn: 0~ 10 2019; Ngay nhdn chmh sua: 25 12 2019; Ngdy duyet ddng: 07 02 2020 Tom tat
Trong nghien cuu nd\: vdt lieu bentomte bien tinh b&i tdc nhdn huu ca vd ca duac dieu che vd img dung de xu ly phenol do vd .\ Ini 11) trong nu&c. I at lieu dupe dieu chi bdng cdch trao doi canon vo ca ndm giOa l&p set bentomte bdng tdc nhdn cetytrimethylammonium bromide (CTAB) vd polycation nhom. Kit qua thu din/c cho thdy tdc nhdn CTAB vdpolycation nhom dd dirpc chen vdo giOa icrp bentomte. Dpng hpc hap phu phenol do vd Mn(II) phii hpp v&i phuang trinh dpng hgc bieu kien bdc 2. Qud trinh hdp phu phenol do vd Mn(II) phii hap v&i mo hinh ddng nhiet Langmuir han md hinh Freundlich. Vivdy, vdt lieu ClAB Al-bentomte dupe sudung ldm chdt hdp phu xic ly phenol do vdMn(II) dicpc xem Id phuang phdp ddy hira hen.
Tir khda: Bentomte. CTAB Al-Bent. hdp phu. Mn(II), phenol do.
AN IN\ ESTIGATION ON THE ADSORPTION OF PHENOL RED AND Mn(n) BY CTAB/AL-BENTONITE IN WATER
Tran Thi Xuan Mai', Tran Viet Dung\ and Bui Van Thang'"
'Dong Thap University 'Thap Muoi High school
'Corresponding author: bvthang%dthu. edu. vn Article history
Received; 0^ 10 2019; Received m revised form: 25^ 12/2019; Accepted: 07d)2 2020 Abstract
In this investigation, the synthesis bentomte materials modified by organic inorganic agents were prepared and applied to treat red phenol andMn (II) in water The materials ii ere prepared by inorganic cation exchange in the middle ofthe bentomte clay layer via cetytrimethylammonium agent bromide (CTAB) and polycation aluminum. The results showed that CTAB agent and polycation aluminum were inserted m the middle ofthe bentonite layer The adsorption kinetics of red phenol and Mn(ll) was consistent with the apparent second-order kinetic equations. The adsorptions of phenol red and Mn (11) hy the isothermal Langmuir model were more .suitable than the Ireundlich miKlei Therefore. CTAB Al-benlonite materials used as adsorbents to treat red phe nn I and Mn (II) are considered a promising method.
Keywords: Bentonite. CTAB Al-Bent. adsorption, Mn(II), phenol red.
Tap chi Khoa hpc Dai hoc Dong Thap, Tap 9, S6 3, 2020, 32-40
1. D l t van de
Su phat trien vugt bac ciia khoa hpc va cdng ngh? da thiic day eae nganh cdng nghidp, ndng nghidp phat tndn m^nh irong thdi dai ngay nay.
Ben cgnh nhirng mgt dgt dupe ve kinh td thi xa hpi ciing dang ddi mgt vdi van nan d nbiem gay ra D$c bidt, cae chat thai tu nha may del nhupm, my pham, thude bao v? thuc vgt, dupe p h i m , luydn kim, san xuat da va thupc da... tao ra ngudn nude thai ldn xam nhgp vao mdi trudng. Hau qua, nguon nude d nhiem bdi cac chat hiiu co va kim logi n5ng la van de cap bach can duoc giai quyel (Dal Bosco vd cs., 2006, Ma vd cs., 2016; Zhu vd cs., 2009). Trong sd cac phuong phap xu ly nude thai chua chat huu co va kim logi thi hap phu dupe xem la phuong phap day hua h?n va dupe nhieu nha khoa hpc quan tam nghien cim (Dal Bosco va cs., 2006; Ma vd cs, 2016; L. Zhu va R Zhu, 2008; Zhu vd cs., 2009).
Trong so cac vgt lieu hap phu hidu qua, ben hda Iy, gia thanh re, ham lupng phong phii trong tu nhien thi khoang bentonite dupe xem la logi vgt lieu thiet thuc, nd cd kha nang xu Iy tdt cac chat gay d nhidm va dupe nghidn cuu ung dung rpng rai trong phuc hdi mdi trudng bi d nhiem (Maiwcj.,20l6,Wangvac5., 2013), Do su thay the ddng hinh trong cau true bentonite dan den Idp aluminosilicale mang dien tich am tren be m$t va dupe bit dap bdi cac cation vd co hydrate nSm giua set bentonite, Cac cation vd co hydrate lien ket Idng leo vdi Idp set aluminosilicate co the dupe thay thd bang cac cation hiru co ky nude thu dupe vgt lieu bentonite hiru co co kha nang xij ly chat hiru co hieu qua (Tran Viel Dung, 2018, L Zhu va R Zhu, 2008) hogc thay thd
bang polyoxocation kim logi kich thudc ldn tgo ra Ioai vgt lieu bentonite chdng cd kha nang xu ly cac carion kim loai trong nude dgt hidu qua cao (Dal Bosco vd cs., 2006, Yan vd cs, 2010).
\'di kha nang dd, bentonite bidn tinh ddng thdi cation boat ddng be mat va polyoxocation vd CO cd the loai bd ddng thdi eac chat htJu co va cation kim logi Trong nghidn cim nay, bentonite bidn tinh bdi tac nhan vd co/biru co dupe didu che bang each trao ddi cation vd co hydrate giua ldp set bentonite bang ca cetytrimethylammonium bromide (CTAB) va polyoxocation nhdm. Vgt lieu bien tinh dupe danh gia rat tdt ve kha nang xu ly phenol dd va Mn(Il) trong nude.
2. Thirc nghiem va phutmg phap nghien cuu 2.1. Nguyen lieu
Trong nghien cuu nay, ngudn bentonite dupe su dung la bentonite Di Linh, Lam Ddng (viet lat la Bent-DL) da qua linh che, Sau khi lam sgch, ham luong monimorillonite (MMT) trong Bent-DL khoang 40-50%, kich thudc hgt nhd hon 10 )im, dung luong trao ddi cation la 57 meq/100 g bentonite khd. Thanh phan hda hpc (phan tram khdi lugng) gdm SiO^ (58,95%), AI^O, (20,54%), MgO (3,27%), CaO (2,06%), Fe^O, (7,78%), N a , 0 (1,09%), K^O (1,38%) va mpt sd oxide khac (Tran Viet Dung, 2018),
Tac nhan bien tinh dupe su dung trong nghien cuu nay la CTAB (Sigma-Aldrich).
Dgc tinh co ban ciia phan tu CTAB dupe chi ra trong Bang 1 Mdt so hda chat khac gdm A1(N0,)3 6 H , 0 , N a X O j , HCl, NaOH, AgNOj, phenol do, MnCI, 4 R , 0 (Trung Qudc) deu d dang tinh khidl, khdng can che hda bd sung.
Bang I. M^t so dac tinh cff ban cua phan tir CTAB Ky hif u
CTAB
Cong thtrc phan tfr
C„H,,NBr
Cau tao ion CTA+
CH, - C , 6 H „
Do dai mach ankyi (A) (TrSn Viet Dung, 2018)
25,3
33
Chuyen san Khoa hoc Tu nhien
2.2. Dieu the vat lieu CT\B Al-Bent Ou\ tnnh dieu ehe CTAB. -M-Beni duoc tien hanh nhu sau la\ 3g Bent-DL phan tan trong 300 mL nude cat dudi dieu kidn khuay manh trdn may khuay lu \di tdc 60 600 \onu phut trong 2 gid thu duoc huydn phu Bent-DL Them ddng thoi dung dieh polyoxocation nhdm (diroc dieu chd tu -\1(N0 ). 0.:\I \a NaXO., 0.2M voi t\
Id moi OH \\ la 2.4) va dung dich CTAB vao hu\ en phii Bent-DL. hdn hpp duoc khuay manh d 60' C trong 5 gid, sau do giu d nhiet do phdng trong 24 gio San pham duoc Ipc tach va rua vai lan bang nude cat dd loai bd het ion CI du (thu bang dung dich XgNO 0,1M) \a say mau o 110''C trong 10 gid thu dupe vat lieu CT.\B' .Al-Bent \ oi muc dich so sanh, mau Bent-DL bien tinh bang polyoxocation nhdm duoc didu che theo each luong tu ma khdng them CTAB \ a san pham dupe ky hieu la Al-Bent Mau Bent-DL huu eo cung duoc didu che bang cach trao ddi cation vd eo h\ drate uiua Idp bang CTAB va san pham dupe ky hieu la CTAB-Bent Trong cac trudng hpp, ndng dp CTAB su dung la 1,0 lan so \di CEC eiia set Bent-DL \a t\ le moi AI' bentonite la 10 mmol g
2.3. Cac phuong phap nghien cdu vat lieu Xac dinh khoang each ldp co ban eua Bent- DL \ a Bent-DL bien tinh bang phd nhieu xa tia X (XRD) trdn nia\ D8 .Advanee-Bruker (Due) su dung buc \a 40 kV 300 mA. quel tu 1-50'.
khoang cach lop dupe xac dinh qua mat 001 cua gian dd XRD Dien lich be mat BET cua eac mau dupe xac dinh tu duong dang nhiet hap phu - khu hap phu nitrogen tgi 77k tren thiet bi Micromerities TnStar 3000 (M\ )
2.4. Khao sat hap phu phenol do va Mn(ll) Iren vat lieu dieu che
La\ 0.1 g vat lidu cho vao 100 mL dung dich phenol do hoac \ ln( II) cd ndng dd 100 m g l dat tren may khuay tu \ ai tdc dp 300 \ ong phiit d nhiet dd phdng trong 120 phijt Mau duoc lay trong khoang thdi gian \ac dinh va ly tam la\
dung dich de phan nch ndng dd phenol dd cdn
lai bang phd l\'-\"is L\ 2^^50 (L.i J' ^'>.) vdi buoc song 432 nm va phan i "''"i^ ^^
Mn(in cdn Igi bang phd ICPAIS .n:iiaNi( AP Q (Thermo Scientific. M\) \ai ngudn cam ung cao t4n plasma (ICP).
Dung lupng hap phu (</) ^^'^'^ ^'"'^ ^""^ ^^^°
cdng thuc (I)
m
Trong do C, \ a C, (mg/L) la nong do ban dau va a thoi diem / (pliui), V la the tich dung dich (1); /;; la l<h6i lugng chSt hip phu (g), </, (mg/g) la dung lugng chSt bi hap phu tren 1,0 g chat hap phu
Cac mo hinh dpng hoc thugng sir dung de danh gia qua trinh hap phy la mo hinh dpng hpc bieu kien b?ic I (2), dpng hpc bieu kien bgc 2 (3)
\ a khueeh tan npi hgt (4) dugc mo ta nhu sau:
ln('/,-•?,)'In('/.)-*!•',
1, k.qi 9,
(2)
(3)
q.=k/"+c. (4) Trong do, q^ va </ (mg/g) la dung lugng hap
phu tai thoi diem / va tai thoi diem can bang, *, (phut-l),t,(gmg '.phut'), ki(mgg ' phiit'^) la hang sp hap phu cua mp hinh dpng hpc bi^u ki§n bac I va bac 2, khueeh tan npi hat Hai mo hinh dang nhiet hap phu pho bien nhSt Sk mp ta trang thai can bang hap phu la phuong trinh Langmuir (5) va phuong trinh Freundlich (6) nhu sau
v , <?« ^'/<y„
ln(/, = InA'f +—In'
Trpng dp, (/_ (mg g) la duni;
C(ic dai; K (Lg) la hang s6 Lai
(5)
(6) ,' hap phu
Tap chi Khoa hoc Dai hoc Dong Thap. Tap 9 S6 3, 2020, 32-40
quan den ai luc ciia tam lien ket \a nang luong happhu;K (L g)lahantisdFreundlichlienquan den dung luong hap phu, 1 " la th^m sd kinh nghiem Men quan den cudng dp hap phu
3. Ket qua % a thao luan 3.1. Phan tich nhieu xa tia X Gian dd XRD eiia mau Bent-DL va Bent- DL bien tinh bdi polyoxocation nhdm, CTAB, hon hpp C 1 \ B AI duoc chi ra trong Hinh 1, Trong mau Bent-DL cd chua thanh phan chinh la MMT \oi cac pic dae trung is d ^ 15.26A.
4,4S\,2.56.A T u g i a t r i d , , , = 15,26A chotha\.
Bent-DL thupc loai bentonite kiem thd chua chu yeu cation vd co hydrate giua ldp la Ca-', Mil Ket qua nay phii hpp vdi nghidn cuu cua L G Yan vd cs (2010) Ben canh cac pic phd dgc trung eua MM 1. con mdt sd pic ciia cac lap chat khac nhu quartz vdi d = 4,26A va 3,35A, calcite vdi d= 2.4oA
Hinh 1. Gian do XRD cua cac mau Bent-DL va Bent-DL bien tinh
3.2. D u o n g dang nhiet hap phu - khti hap phu nitrogen
Dudng dang nhidt hap phu - khu hap phu N, ciia mau Bent-DL va Bent-DL bidn tinh nhu chi ra trong Hinb 2
Ap suaitifcmg doilP/P,,)
.4
.Apsua'tiirfJogdoMP/P,,) Hinh 2. Dudiig dang nhiet hSp phu - khti' hSp phu N, cua (a) Bent-DL, (b) CTAB-Bent,
(c) CTAB/Al-Bent va (d) Al-Bent Bang 2 tom tat mdt sd thong sd dgc trung
cho tmh chat be mat cua \at lieu Dien lich bd mat ciia .Al-Bent la 182,67 nr/g, ldn hon dien tich be mat cua Bent-DL la 45.74 m-/g. Didu na> cho tha\ mau Al-Bent cd su dong gdp cua polyoxocation nhdm nam trong Idp xen giua cua set bentonite \ a dien tieh be mat dd co su hap phu luong ldn phan lu N. Trong khi dd. mau
CTAB-Bent \ a CTAB Al-Bent cd dien tich bd mat nho so vdi Bent-DL \ a Al-Bent Dieu nay CO the giai thich dua \ a o the tich ciia tac nhan CTAB bidn tinh co kich thudc ldn hon rat nhidu SO vdi ion Ca-' hydrate va polyoxocation nhdm nSm trong Idp xen giua cua set (L. Zhu va R Zhu. 2007. L Zhu \ a R Zhu, 2008, R Zhu vd cs. 2009) Ket qua danh gia hieu qua xu ly
35
Chuyen san Khoa hpc Tu nhien
phenol dd va Mn(II) cua cae loai vat lieu didu che ciia nhdm nghien cuu truoc dd (Biii \ a n Thang vo cs, 2019), cho thay rang hieu suat xu ly phenol dd cua CTAB-Bent, CTAB Al-Bent eao hon Bent-DL, Al-Bent Trong khi dd, hidu suSt xu ly Mn(II) tang theo thd tu CTAB-Bent
< Bent-DL < CTAB, .Al-Bent ^ Al-Bent. Kdt qua xiJr ly nay cho thay khdng cd mdi lien he vdi dien tich be mat ciia eae mau Bent-DL bien tinh chi ra trong Bang 2. Mau .Al-Bent \ a Bent-DL co dien lich be mat cao nhung kha nang hap php ciia ehiing van thap hon mau CTAB .Al-Bent
Bang 2. M^t so thong so d£c trung ctja Bent-DLva Bent-DL bi§n ttnh
Mau ,(mVg) V (cm^/g)
edng bd trudc da\ ( M a i ^ o .2016 ""^
vd cs.. 2015; L Zhu \ a R. Zhu. : '^ ^"^^
vd cs . 2009). Khi thdi gian tSng ' l^'" ' ^ ^ phtJt. qua trinh hap phu xay ra cl hon do su luong tac giua tac nhan da bi h.ip phU va lac nhan hap phu trong dung djch 1 'i^^i y ' ^ " "^^^
thidt dd xu ly phenol do va Mn(ll iren \at lieu CTAB/AI-Bent la 30 phut. tu> nhien, dd dam bao qua trinh thi nghiem nen thdi gian dupe chpn la 60 phiit cho cac thi nghiem tiep theo.
BcntDL 45.74 0,091 CTAB-Bent 3.90 0,028 CTAB/Al-Bcnt 1.05 0.012 Al-Bent 182.67 0.169
3.3. Danh gia kha nang xd K phenol dd va Mn(II) cua vat li^u
3.3.1. Anh hmmg cua th&i gian vd dgng hgc hdp phu
Thi nghiem danh gia hieu qua xu ly phenol d d v a Mn(ll) cua Bent-DL nguydn lieu va Bent- DL bien tinh bdi CTAB/.AI nhu sau luong chat hap phu 1 g/L, nhiet dp 30' C, anh huong ciia thdi gianxu Iy 0 - 120 phiit, ndng dp eae chat la 100 mg/L Ket qua khao sat anh hudng cua thdi gian ddn kha nang xu ly phenol dd va Mn(il) dupe trinh bay trong Hinh 3.
Nhu chi ra trong Hinh 3 cho thay dung lupng hap phu tai thdi gian / tang nhanh trong 10 phut dau va dat thdi gian hap phu cue dai trong khoang 30 phut dau Su hap phu nhanh d giai doan dau duoc giai thich nhu sau khi ndng dp chat hap phu cao thi mpt sd luong ldn \ i tri hoat dpng san cd de hap phu, lao dpng luc di chu\ en ciia phan tu phenol \ a Mn(ll) trdn bd mat ciia \ a t lieu CTAB/.AI-Bent. Qua trinh hap phu cac chat huu co, oxyanion va ion kim loai ldn lOB xay ra nhanh dat den can bang phii hpp \ oi
a 60
t 55-
f SO- Q 4S-
«,
40-
^*^~^
- ^ i . — . -—•— Phenol 1
Thtii gian, t (phill) Hinh 3. Anh hirang cua thM gian xu- ly phenol
do va Mn(ll) tren CTAB/Al-Bent Dpng hpc hap phu la mpt yeu to quan trpng de hieu dupe co che hap phu va danh gia hieu qua aia chat h4p phu Mpt s6 mp hinh dpng hpc khac nhau la phuong trinh dpng hpc bilu kien bac 1 (2), dpng hpc biSu kign bac 2 (3) va mp hinh khueeh tan npi hat (4) dupe ap dung de kiem tra su phu hpp ciia cac du kien thuc nghiem hap phu phenol dp va Mn(II) b5ng CTAB/Al-Bent de du dpan dpng hpc h4p phu Duong ve tuySn tinh cua cac mo hinh dpng hpc khac nhau dupe trinh bay trong Hinh 4 HSng so tpc dp cua phuang trinh dpng hpc bi^u kiSn bac l,lc^vi gia tri q dupe tinh til hinh ve \n(q^-qj qua't (Hinh 4a) va ket qua tinh tpan duoc trinh bav trpng Bang 3 He SP tupng quan («•) thip cho thiy su phii hpp kem vol gia tri thuc nghiem, ngoai ra gia tri o xac dinh theo mo hinh nay cung kh;;, xa voi gia
•ri ?„„, Do vay su hjp phu phenr, ,; ,, vin(II) tren CTAB/Al-Bent khong phu h, 'ihuong trinh dpng hpc bieu kiln bac 1
Tap chi Khoa hpc flai hpc Bang Thap, Tap 9, S6 3, 2020, 32-40
(a)F)Hmigtndi d ^ h ^ c b i l u I K H b | c l
30 60 90 Thori gian, t (phut)
(b) Phmmg tiinb d ^ b^c bidu IfKn bac 2 (c) M6 hmh kfaudch tin npi hat
Tbcri gian, t (pbiit)
3 6 9 / ' ^ ( p h i i t i ^ )
Hinh 4, Dang tuyen tinh cdc mo hinh dong hoc ciia qua trinh hap phu: (a) d^ng h^c bieu kien bac 1, (b) d9ng hQC bieu kien bac 2 va (c) kbuech tan noi hat
Bang 3, Tbong so d^ng b^c ciia pbmmg trinh dong hgc bieu kien bac 1 (2), dong b^c bieu kien bac 2 (3) va mo hinh kbuech tan n^i hat (4)
Phmmg trinh d^ng hoc bieu kiln bSc 1
Pbuwig trinh dong hpc bieu kien bac 2
Mo hinh kbuech tan n^i hat
(mg/g)
(phiir') (mg/g)
k-
(g/mgphiir') q^ (mg/g) K- (mg/g.
phur') (mg/g)
Phenol
do > =-0.0242x-0.4387 v = 0.0152x +0.0156 y = l,1326x +55,10
64.92 0.058 7.06 0,863 0,0152 65.78 0.999 1.133 55.10 0,624
Mn(II) y =-0,058 lx+1,9545 v = 0,022x + 0.0033 v =0,1485x +44,116
45.42 0.024 0.65 0,675 0,147 45.45 1 0,149 44.16 0.486
37
Chuyen san Khoa hpc Tu nhien
Tu Bang 3 nhan thay rang, gia tri e thu duoc lu mo hinh khueeh tan noi hat khac khdng \ a he so tuong quan (W-) rat thap, do \ a \ md hinh khueeh tan ndi hat khong diing de xae djnh ddng hoe ciia qua trinh hap phu (Hmh 4c) Hinh ve tuyen tinh eua / q^ qua / doi \ o i mo hinh ddng hpc bieu kien bac 2 duoc thd hidn trong Hinh 4b Hang sd toe dp bac 2, A^, \ a gia tri q^^.^ xae djnh tir hinh \ e \ a kei qua duoc trinh bay trong Bang 3 Gia tri tuong quan (/?-) rat cao \ a gia tri q^^, gan vdi gia tri q^^^^_ Do va> mo hinh ddng hoc bieu kien bac 2 md la ddng hpc hap phu phenol dd va Mn(II) trdn CTAB .Al-Bent phu hpp hon mo hinh dpng hpe bieu kien bac 1 \ a md hmh khueeh tan npi hat Ket qua nay phii hop \ oi mdt sd cdng bo trudc d<i\ (Dal Bosco vd cs , 2006, Ma vd cs ,2016; Wang va c s , 2013)
3.3 2. Inb hmmg cua ndng do phenol do.
.\ In(ll) vd dm'mg ddng nhiet hdp phu De nghien ciru anh huong cua ndng dp phenol dd \ a Mn(ll) den qua trinh hap phu,
(•) Phirffng Irinli Langmuir
thi nghiem dupe lien hanh voi du (phenol do). pH 6 (Mn(ll)), lupnr '^ ^ ^ ^'*
Al-Bent la 1 g T ( d d i \oi phenol . va 1 . 5 g L (ddi voi Mn(Tl)) \ a thoi gian hap , nu oO phut Duong ve tuydn linh cua md hinh j a n g "^iet Langmuir va Freundlich dupe ch i • ^'"^ ^'"'^
5 \ a kdt qua tinh toan eae thdng so dpng hpe dupe chi ra trong Bang 4
Dung lupng hap phu phenol dd tang tir 65,54 Idn 121.44 mg'g (phenol dd), tir 32.58 ldn 85,76 mg/g (Mn(ll)) trong khi phan tram hap phu giam tir 65,5 xudng 17.3" o (phenol do), tir 21,7 xuong S,2% (Mn(II)) khi ndng dp phenol do sir dung tang lir 100 len 700 mg/L. Ndng dd phenol ddva Mn(ll) ban dau ddng vai tro quan trpng thuc day su ehuyen phan tir/ion chSt h4p phu giiJa dung dich va be m^i cua vat lidu CTAB. Al-Bent, Mat khac, d ndng dd cao thi phenol do hoac Mn(n) khdng the tuong tac voi tam lidn ket hogt dpng cua CTAB/AI-Bent do do bao hoa cua cac vj tri lien ket nay (Dal Bosco vd cs , 2006, Ma vd cs . 2016, Wang vdcA, 2013)
(b) Pbinng tmb FreundUcli
Hinb 5. Dang tuyen tinh cua phuTmg trinh d3ng nhiel hSp phu phenol do va Vln(n) Ien .41/CTAB-Bent: (a) Langmuir va (b) Freundlich
Bang 4. Cac tham so ciia phuOTig trinh Langmuir va Freundlich cua qua trinh hjp phu phenol do va Mn(ll) len AI/CTAB-Bent it 30"C
^ , . C. C, 1 Chat bl Langmuir —^ = -—
h i p phu ?< «- '^^1-
Mn(Il)
K, (L'mg) 9^(mgg)
= 0.0074X + 11.52(16 (1.11142 135.14
= (l.(1093x+ 1.4946 0.0062 1(17.53
Freundlich In^^ - l/n
InC,+lnA:,, Hy (L/g) V = 0.245 K +3.2436 0.9897 0.2451 25.626
V = ( J . 4 3 % \ - 1.7219 11.9948 0.4356 5.595
Tap chi Khoa hoc Dai hoc Ddng Thap, Tap 9, S6 3, 2020, 32-40
Cac dir kien can bang h^p phu thu dupe tu su hap phu phenol dd va Mn(ll) len CTAB/Al- Beni phii hpp ca md hinh dang nhiet Langmuir
\ a Freundlich Gia tri cae hang sd Langmuir doi
\cri qua trinh hap phu phenol do Idn CTAB/AI- Bent, q^^^ \a E thu duoc tir dudng thang tuyen tinhcuart/, qua Ce (Hinh 5a) la 135,14 mg/g va 0.0142 L mg voi he sd tuong quan (R-) cao la 0.Q897 Gia tri 7^, trong khoang lir 0,4132 ddn 0,0914 Khi nong dp cua phenol do la 100 va 700 mg/L Gia tri eac hang sd Langmuir ddi vdi qua tnnh hap phu Mn(ll) Idn CTAB/.AI-Benl, q^^^^^ va A'l thu dupe tir dudng thang tuyen linh ciia CJq^
qua Ce (Hinh 5a) la 135,14 mg/g va 0,0062 L/mg voi he sd tuong quan {If) eao la 0,9897 Gia tri R trong khoang tir 0,6173 den 0,1873 khi ndng dpciiaMn(Il)la 100 va 700 mg/L Dieu nay ehi ra rang, CT\B Al-Bent phii hpp doi voi su hap phu phenol dd va Mn(ll) trong nude.
Gia tri cac hang so Freundlich ddi vdi qua trinh hap phu phenol do ldn CTAB/Al-Bent, K
\a \in dupe lay tir dudng thang tuyen tinh ciia Int/^ qua ( \ (Hinh 5b) la 25,626 va 0.2451 voi he sd tuong quan (/^^) cao Hang sd Freundlich \fn nhd hon I chi ra rang qua trinh hap phu thuan Ipi trong dieu kien nghien eiru Gia tri cac hang sd Freundlich ddi vdi qua trinh hap phu Mn(ll) len CTAB/.AI-Bent, /^'.va l/n duoc \ky tir dudng Ihang tuyen linh cua ln</^qua C'^ (hinh 5b) la 5.595
\a 0.-4.i56 voi he sd tuong quan (/?-) cao Hang sdFreundlich i///nhdhon 1 chira rang qua trinh hap phu thuan Ipi trong didu kien nghien ciru.
Tir ket qua nghien eim su hap phu phenol dd va Mn(II) tren CTAB Al-Bent la phu hop \oi ca md hinh Langmuii va Freundlich. Dieu nay cho thay \ at lieu dieu che eo su phan bd dong deu va khdng ddng deu cac \ i tri hoat dpng tren be mat cua CTAB Al-Bent
4. Ket luan
Trong bai bao nay, chiing toi da khao sat dupe mpt sd yeu td anh hucmg den qua trinh dieu che v|t lieu CTAB/AI-Bent theo ba cach khac nhau, kdt qua phan lieh hoa l\ va danh gia kha
nang \u h phenol do \ a Mn(ll) cho thay la mau dieu chd bang each trao ddi cation \ d hydrate nim d lop xen giiia bang dong thdi tac nhan CTAB/AI cho hieu qua xir l\ phenol do va Mn(Il) ldn hon Dieu kien dieu che \ at lieu CTAB, Al-Bent tdi uu da duoc khao sal la t> Id moi Al/bentonite la 10 mmol/g, ndng do CTAB su dung la 1,0 i k CEC ciia set bentonite lien hanh trao ddi ion trong mdi trudng nude thu duoc vat lieu co kha nang \u ly tot ca phenol do \ a Mn(il) trong nude
Trong sd cac vat lieu dieu che da khao sat, mau CTAB/.AI-Bent ed hidu suatxu ly ddng thdi phenol do va Mn(II) tdt nhat so voi cae mau cdn Iai Da khao sat mot sd \ eu td anh hudng den kha nang xirly phenol do va \ln(ll) trong mdi trudng nude nhu thdi gian.dd pH, ndng dp tae nhan b\
hap phu, luong chat hap phu, nhiet dd Md hinh dong hoe bieu kien bac 2 mo ta qua trinh hap phu phenol do vaMn(ll) Ien vat lieu CTAB/AI-Bent phii hop hon mo hinh dong hoc bieu kidn bae 1 va md hinh khueeh tan noi hat Dudng dany nhiet hap phu phu hop vdi ca md hinh dang nhiet Langmuir \ a Freundlich cho thay be mat vat lieu dieu che chira ca be mat ddng nhat va khong ddng nhal Tir nhirng nghien eiru nay cho thay vat lieu bentonite bien tinh ddng thdi CTAB/AI cd kha nang hap phu lot cac chat hCru co va cation kim Ioai trong nuoc,/
Tai lieu tham khao
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