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Nghiên cứu ảnh hưởng của pH đến điện tích của màng lọc nano
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Nghiin cuu
NGHIEN CUU ANH HUOfNG CUA PH DEN DIEN
TICH CUA MANG LOC NANO
Nguyen Phuong Tu, Doan Thi Oanh
Trudng Dai hpc Tai nguyen va Mdi tiardng Ha Npi
Tom tat
Bdi bdo di cap den dnh hucmg cua gid tri pH din diin tich ciia mang loc nano
trong qud Irinh hoai dong cua mang. Diin tich cua mang loc khong co dinh md co
the thay doi khi thay doi pH ciia dung dich. Thi nghiem dugc lien hdnh vai mang
loc nano composite l&p mong NF-270. Cdc gid tri dien the zeta the hien dien tich
cua mdng loc thay doi theo su thay doi pH cua dung dich ddu vdo. Dien the zeta
giam khi IdngpH tif 3,81 t&i 10.52. Khi gid fri dien thi zeta nho han 0, tri tuyet ddi
ciia no tdng khi pH tdng Ddc biet, Igi pH = 5.01, co .su lhay doi diin tich cua mdng
loc Gid tri dien the zeta ciia mdng loc tgipH 5,01 Id -0,41 mM, the hien su thay
doi dien tich mdng he tii-dien lich duang sang dien lich dm. Anh hu&ng ciia pH den
diin tich ciia mdng loc Id yiu to quan trong ldc dgng tai khd ndng logi bo cdc chdt
tan mang diin tich cua mdng loc nano.
Tir khoa: Mang loc nano; pH; Dien the zeta; Dien the ddng chay tiip tuyen.
Abstract
Studying the influence ofpH on nanofiltration membrance charge
The article describes the influence of pH on membrane charge during the
filtration. The membrane charge is not constant and changes according to pH of the
solution. The experiment was conducted with polyamide thin -film composite NF270. Zeta-polential which represents the membrane charge changed as afuncOon of
pH values of feeding solution. The resub showed that zeta potential was decreased
when the pH was increased from 3.81 to 10,52. Then, the zeta potential became
negative and increased in absolute value as a function ofpH. Especially, at pH
5.01, a reversal of the sign of the membrane surface charge was observed, the zela
potential value of the membrane alpH 5,01 was -0.41 mM, marking the changing of
membrane charge from positive to negative The influence ofpHon the membrane
charge is an important factor that affects the ability of removing charged solute of
nanofilalralion membrane.
Keywords: Nano filtration, pH, zeta potential, tangential slreammg potential.
1. DAT VAN D £ hanh dn dinh trong nhieu dieu kien, dl
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Tap chi Khoa hgc Tdi nguyen vd Moi tru&ng - Sd 20 - ndm 2018