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Effect of organic solvent type on the removal of nitrate ion using liquid membrane technique

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Abstract

In this study, the removal of nitrate ions from aqueous solutions with liquid membrane technique has been investigated for different organic solvent types in which solubilized tetradecyl trimethyl ammonium bromide (TDTMABr) as carrier. n-butyl alcohol, chloroform, and mixture of chloroform + n-hexane (n-hexane 85% + chloroform 15%) were used as organic solvent. Kinetic parameters (k 1d, k 2m, k 2a, t max, R maxm , J maxm , J maxa ) were calculated from obtained data. time R a values of mixture, butyl alcohol, and chloroform are 0.81, 0.78, and 0.55, respectively. Similarly R d, R m, and t max values of the mixture equal to 0.14, 0.04, and 87.92 min, respectively. This behavior of the system shows the organic solvent type is an effective parameter on separation yield. It can be concluded that the mixture is the most effective organic solvent type among the investigated ones, because liquid membrane systems should be operated within the range of having the R m, R d, and t max values are minimum while R a values are maximum.

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Abbreviations

C a :

nitrate ion concentration in acceptor phase (mol l−1, M)

C carrier :

carrier concentration (mol l−1, M)

C do :

nitrate concentration in the donor phase at t = 0 moment (mol l−1, M)

C m :

nitrate concentration in organic (membrane) phase (mol l−1, M)

\(D_{{\rm QNO}_{3}}\) :

mean diffusion coefficient of the complex in the membrane of thickness l (m2 s−1)

J maxa :

maximum value of membrane exit flux (min−1)

J maxd :

maximum value of membrane entrance flux (min−1)

k 1 :

membrane entrance rate constant (min−1)

k 2 :

membrane exit rate constant (min−1)

k 1d :

membrane entrance or leak to membrane rate constant (min−1)

k 2a :

acceptor phase entrance rate constant (min−1)

k 2m :

membrane phase exit rate constant (min−1)

K :

equilibrium constant (–)

R :

reduced nitrate ion concentration (–)

R a :

reduced nitrate ion concentration in acceptor phase (–)

R d :

reduced nitrate ion concentration in donor phase (–)

R m :

reduced nitrate ion concentration in membrane phase (–)

R maxm :

maximum reduced nitrate concentration of membrane phase (–)

S d/m :

interface surface of donor and membrane phases (cm2)

S a/m :

interface surface of acceptor and membrane phases (cm2)

t :

time (min)

t inf :

time corresponding to inflection point of the function (min)

t imax :

time which nitrate concentration reaches maximum (min)

l i :

distance between phases (cm)

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Authors and Affiliations

  1. Atatürk Üniversitesi Mühendislik Fakültesi Çevre Mühendisliği Bölümü, 25240, Erzurum, Turkey

    Şahset İrdemez, Yalçın Şevki Yıldız & Nuhi Demircioğlu

  2. Celal Bayar Üniversitesi Demirci Eğitim Fakültesi Demirci, Manisa, Turkey

    Nazmi Topçu

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  1. Şahset İrdemez
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  2. Nazmi Topçu
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  3. Yalçın Şevki Yıldız
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  4. Nuhi Demircioğlu
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Correspondence to Şahset İrdemez.

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İrdemez, Ş., Topçu, N., Yıldız, Y.Ş. et al. Effect of organic solvent type on the removal of nitrate ion using liquid membrane technique. Stoch Environ Res Ris Assess 21, 175–181 (2006). https://doi.org/10.1007/s00477-006-0054-5

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