An evaluation of the adsorption dynamics of phosphate ions onto   Fe(II)-montmorillonites

Dawei QIN; Shuhua CHANG; Min QIAO; Xiaotong YUAN; Wei LIU; Gang LIU

Makale detayları

An evaluation of the adsorption dynamics of phosphate ions onto Fe(II)-montmorillonites

Yazarlar:

Dawei QIN | Shuhua CHANG | Min QIAO | Xiaotong YUAN | Wei LIU | Gang LIU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2019 Vol.43 Issue 1, pp.50-62

Belge Tipi:

Makale

Yayın Tarihi:

1/2019

Belge Dili:

Türkçe

Document ID (Org No.):

2000725844

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

Fe(II)-montmorillonites (Fe(II)-MMTs) were prepared by   mixing solutions of Fe(II) and montmorillonite at pH 3.5. Two different   Fe(II)-MMTs were prepared and the ferrous iron contents were 40 mg/L and 80   mg/L. All samples were characterized by XRD, FT-IR, TGA, DSC, and nitrogen   adsorption. By nitrogen adsorption, the pore size can be obtained in the   pore diameter curve with average pore widths of 6.67 nm, 9.96 nm, and 17.07   nm, respectively. The removal rate of phosphate increased rapidly during the   first 40 min, in which Fe(II)-MMT (1) and Fe(II)-MMT (2) were stronger   adsorption systems than MMT. The maximum adsorption was 48.38 mg/g at pH   2.0. The kinetics of phosphate adsorption were better described using   pseudo-second-order models (R22^{2}: 0.997, 0.999, 1.000) than   pseudo-first-order (R22^{2}: 0.933, 0.900, 0.760). R22^{2} is the   determinable statistic coefficient that measures the goodness of fit. If the   R22^{2} value is closer to one, the fitting degree of the regression line is   better. By the thermodynamic analyses, we obtained the ΔΔ\Delta G∘∘^{\circ}   and ΔΔ\Delta H∘∘^{\circ} of samples at 298 ∘∘^{\circ}C, 303 ∘∘^{\circ}C, and 310 ∘∘^{\circ}C. The adsorption isotherms also better fitted a   Langmuir model in which the process was nonspontaneous and exothermic.

Makale detayları

An evaluation of the adsorption dynamics of phosphate ions onto Fe(II)-montmorillonites

Yazarlar: Dawei QIN | Shuhua CHANG | Min QIAO | Xiaotong YUAN | Wei LIU | Gang LIU

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2019 Vol.43 Issue 1, pp.50-62

Belge Tipi: Makale

Yayın Tarihi: 1/2019

Belge Dili: Türkçe

Document ID (Org No.): 2000725844

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Dawei QIN | Shuhua CHANG | Min QIAO | Xiaotong YUAN | Wei LIU | Gang LIU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2019 Vol.43 Issue 1, pp.50-62

Belge Tipi:

Makale

Yayın Tarihi:

1/2019

Belge Dili:

Türkçe

Document ID (Org No.):

2000725844

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527