Hình 3.11 : nh SEM ca CFLA
B ng 3.8: Các tính c ht ca Cu(II), Ni(II) và Pb(II)
âm đi n H ng s th y phân (pK) Bán kính ion (pm)
Cu(II) 1,90 7,7 73
Ni(II) 1,91 9,9 69
Pb(II) 2,33 7,7 118
M t khác, Cu (II) có bán kính ion nh h n Pb (II) mà ion kim lo i có bán kính ion nh
h n s d ti p c n v i tâm h p ph h n [64]. i u này đúng v i th c nghi m khi dung
l ng h p ph Cu (II) 2,49 mmol/g l n h n Pb (II) 1,γγ mmol/g. Tuy nhiên, Cu(II) l i
có đ âm đi n th p h n Pb (II) mà ion có đ âm đi n l n h n s có t ng tác c ng hóa
tr m nh h n. i u này gi i thích t i sao, hình 3.19 tuy CFLA h p ph Pb (II) th p
h n Cu (II) nh ng các peak nhóm ch c trong ph CFLA_Pb l i g n nh t ng tác h t
so v i m u CFLA ban đ u. Trong quá trình s y và đo m u FTIR c a các m u sau h p
ph s y đi u ki n th ng, có th m t ph n kim lo i Cu (II) đã b gi i h p nhi t đ
cao so v i Pb (II) có liên k t hóa h c v i CFLA m nh h n Cu (II) và Ni (II). i u này
t ng t v i m t k t qu nghiên c u đã đ c công b khi Cu (II) b gi i h p nhi t đ
CH NGă4: K T LU N VÀ XU T
4.1. K t lu n
S i micro nano cellulose (MNCF) đã đ c t ng h p thành cơng b ng ph ng pháp
ki m hóa và x lỦ c h c đ ng hóa rotor-stator k t h p siêu âm. Bên c nh đó, CFLA đã
đ c t ng h p thành công b ng ph ng pháp t o liên k t ngang. i u ki n t ng h p t i
u đã đ c xác đnh v i: n ng đ huy n phù 1 % và t l MNCF:CS:LS là 1μ1μ1 t ng
ng v i m u CFLA. K t qu phân tích: kh i l ng riêng, FTIR, XRD, và TGA c a
CFLA cho th y các nhóm ch c ch a oxy, amine và sulfua c a MNCF, CS và LS đã liên
k t v i nhau hình thành c u trúc aerogel. K t qu phân tích SEM cho th y v t li u CFLA
có kích th c kênh mao qu n đ t 40 – 80 m.
nh h ng c a các y u t nh th i gian ti p xúc và n ng đ ban đ u đ n kh n ng h p
ph c a CFLA đ i v i:
Cu (II): th i gian h p ph đ t cân b ng là sau 30 phút. Quá trình h p ph ph thu c
vào giai đo n cân b ng h p ph , phù h p v i mơ hình đ ng h c b c hai và h p ph đ ng nhi t Langmuir. Dung l ng h p ph Cu (II) c c đ i đ c xác đnh là 158,73 mg/g.
Ni (II): th i gian h p ph đ t cân b ng là sau 30 phút. Quá trình h p ph ph thu c
vào giai đo n cân b ng h p ph , phù h p v i mơ hình đ ng h c b c hai và h p ph đ ng nhi t Langmuir. Dung l ng h p ph Ni (II) c c đ i đ c xác đnh là 72,99 mg/g.
Pb (II): th i gian h p ph đ t cân b ng là sau 15 phút. Quá trình h p ph ph thu c
vào giai đo n cân b ng h p ph , phù h p v i mơ hình đ ng h c b c hai và h p ph đ ng nhi t Langmuir. Dung l ng h p ph Pb (II) c c đ i đ c xác đnh là 276,24 mg/g.
C ch h p ph c a CFLA đ i v i Cu (II), Ni (II) và Pb (II) c ng đ c nghiên c u.
Quá trình h p ph ph thu c vào s t o ph c gi a nhóm –OH, N-H và SO3 c a CFLA
v i các ion kim lo i Cu (II), Ni (II) và Pb (II).
Qua k t qu nghiên c u c a lu n v n cho th y v t li u CFLA phù h p đ h p ph các
ion kim lo i Cu (II), Ni (II) và Pb (II) trong n c. V t li u CFLA có kh n ng ng d ng
đ x lý các ion kim lo i n ng trong n c.
4.2. xu t
Tác gi đ xu t h ng nghiên c u ti p theo là kh o sát quá trình h p ph ion kim
ng d ng làm lõi l c lo i b kim lo i n ng. Quy trình thí nghi m mơ hình c t h p ph
đ ng đ c th hi n trong hình 4.1
Hình 4.1: Quy trình thí nghi m c t h p ph kim lo i n ng trên CFLA
Thuy t minh quy trình: V t li u CFLA đ c nh i trong c t h p ph và đ c ng n
cách v i đ u ra b ng m t l p màng l c micro. Sau đó, m u dung d ch ch a các ion kim
lo i n ng đ c b m qua c t h p ph . Dung d ch sau h p ph đ c t o ph c v i thu c
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PH L C i u ki n t ng h p Tên m u m (g) h (mm) d (mm) CFLA_F1 0,2838 24,99 32,21 CFLA_F2 0,3034 22,25 32,92 CFLA_F3 0,2898 24,53 31,66 CFLA_F4 0,2696 25,99 33,16 CFLA_C1 0,2837 24,99 32,22 CFLA_C2 0,3631 23,55 29,61 CFLA_C3 0,3651 23,42 32,69 CFLA_C4 0,3607 25,53 32,17 CFLA_L1 0,2839 24,97 32,20 CFLA_L2 0,5754 26,49 29,74 CFLA_L3 0,4564 18,53 29,56 CFLA_L4 0,4412 15,67 28,44 CFLA_0,50 0,1750 21,54 29,05 CFLA_0,75 0,2822 24,45 32,70 CFLA_1,00 0,2838 24,99 32,21
nhăh ng c a th i gian
Kim lo i
STT
Cu (II) Ni (II) Pb (II)
t (phút) qe (mg/g) t (phút) qe (mg/g) t (phút) qe (mg/g) 1 0,25 47,18 0,25 7,46 0,25 40,11 2 1,00 75,44 1,00 11,85 1,00 69,50 3 2,50 80,69 2,50 15,67 2,50 116,86 4 3,00 83,84 3,00 17,58 5,00 121,13 5 4,50 84,09 5,00 32,44 7,00 123,23 6 7,00 89,01 7,00 32,87 15,0 121,45 7 15,0 94,24 15,0 35,00 30,0 122,05 8 30,0 96,42 30,0 38,37 60,0 122,41 9 60,0 96,15 60,0 39,56
nhăh ng c a n ngăđ banăđ u
Kim lo i
STT
Cu (II) Ni (II) Pb (II)
Ce (mg/L) qe (mg/g) Ce (mg/L) qe (mg/g) Ce (mg/L) qe (mg/g) 1 15,63116 50,30568 29,61474 18,15574 25,03115 43,07945 2 96,06791 91,72125 103,8995 50,81625 94,31818 95,15007 3 177,8608 112,9999 207,5739 56,74972 170,0661 139,2576 4 258,5281 139,6092 314,0974 59,91747 260,4351 172,9051 5 377,6292 145,2062 411,8526 64,87661 363,3775 199,591 6 456,9909 143,7989 491,7052 64,65702 445,1282 204,6678 7 552,5965 143,7477 603,0509 64,73948 548,5316 211,9223
ng chu n ng chu n Cu (II) ng chu n Ni (II) y = 0.2288x - 0.0055 R² = 0.9955 -0.05 0 0.05 0.1 0.15 0.2 0.25 0 0.2 0.4 0.6 0.8 1 1.2 h p thu N ng đ ph c Cu (ppm) y = 0.6978x + 0.0111 R² = 0.9917 0 0.1 0.2 0.3 0.4 0.5 0 0.2 0.4 0.6 0.8 h p thu N ng đ ph c Ni (ppm)
ng chu n Pb (II) y = 0.0385x + 0.0016 R² = 0.9906 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0 0.5 1 1.5 2 2.5 h p thu N ng đ ph c Pb (ppm)
LÝ L CH TRÍCH NGANG
H và tên: Tr n Qu c Huy
NgƠy,ătháng,ăn măsinh: 24/10/1993 N iăsinhμ à L t
a ch liên l cμ ng Cao Th ng-Ph ng 7-Thành ph à L t
TDD: 0915125909
Email: Quochuytran2410@gmail.com
QUÁăTRỊNHă ÀOăT O
2014-2018: Sinh viên chuyên nghành Hóa h u c , khoa K thu t Hóa H c, tr ng đ i
h c Công Nghi p Th c Ph m TP.HCM.
2019-2022: H c viên cao h c chuyên nghành K thu t Hóa H c, tr ng i h c Bách