Synthesis of PVDF/ZrO2 Hybrid Membranes and Its Adsorption Property Toward Bovine Hemoglobin†

doi:10.7503/cjcu20131265

Abstract

Abstract:

PVDF/ZrO₂ hybrid membranes was synthesized by blending the PVDF casting solution and ZrO₂ nanoparticles whose surface was modified by 3-aminopropyltriethoxysilane. Scanning electron microscopy(SEM), X-ray diffraction(XRD) and thermal analysis were used to character the membranes. The results showed that the functionalized ZrO₂ nanoparticles were deposited on the surface and entrapped into the inner pores of PVDF. The pore size of PVDF was affected by ZrO₂ additions, which were enlarged as the ZrO₂ loading amounts increased. The adsorption experiments of BHb showed that an enhanced adsorption capacity was observed for PVDF/ZrO₂ hybrid membranes. When the initial concentration of BHb was 150 μg/mL, the pH value was 7 and the contact time was 45 min, the maximum capacity of hybrid membrane was 0.181 mg/cm². Its adsorption kinetics was in accordance with the first order kinetics model, and the adsorption isothermal was fitted to the Langmuir equation.

Key words: Organic-inorganic hybrid material, Surface adsorption, Polyvinylidenefluoride(PVDF), Zirco-nium oxide, Bovine hemoglobin

CLC Number:

O647

TrendMD:

WU Chaochao, LIU Gen, XU Junli, ZHANG Xia. Synthesis of PVDF/ZrO₂ Hybrid Membranes and Its Adsorption Property Toward Bovine Hemoglobin^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 784.

Figures/Tables 12

Table 1 Synthetic parameters(mass fraction, w) of PVDF/ZrO2 hybrid membranes

Sample	w(ZrO₂)(%)	w(PVDF)(%)	w(DMF)(%)	w(PVP)(%)
PVDF	0	14	84	2
PVDF/ZrO₂ -2%	2	14	82	2
PVDF/ZrO₂ -4%	4	14	80	2
PVDF/ZrO₂ -6%	6	14	78	2

Fig.1 XRD pattern of ZrO2 surface modified by APTES t: Tertragonal phase; m: monoclinic phase.

Fig.2 SEM images of PVDF(A) and PVDF/ZrO2 hybrid membranes(B—D) with different ZrO2 loading amounts(B) 2%; (C), (D) 4%; (E), (F) 6%.

Fig.3 TG(a)-DTA(b) curves of PVDF/ZrO2-2% composite membranes

Table 2 Loading amount of ZrO2 and porosity of the hybrid membranes

Sample	Loading amount of ZrO₂(%)	Porosity(%)	Sample	Loading amount of ZrO₂(%)	Porosity(%)
PVDF	0	90.30	PVDF/ZrO₂-4%	30.85	91.99
PVDF/ZrO₂-2%	23.64	90.85	PVDF/ZrO₂-6%	42.35	92.35

Fig.4 Adsorption capacities of BHb on PVDF(a) and PVDF/ZrO2-2%(b) with different contact times

Fig.5 Adsorption capacities of BHb on PVDF(a) and PVDF/ZrO2-2%(b) hybrid membranes with different pH values

Fig.6 Adsorption capacity versus initial concentration of BHb on PVDF(a) and PVDF/ZrO2-2%(b) composite membranes

Table 3 Fitting results of isotherm curves of ZrO2 and PVDF/ZrO2 membranes

Sample	Langmiur equation			Freundlich equation
Sample	Q_e/(mg·cm^-2)	K_a/(L·mg^-1)	R²	K_F/(m $g 1 - 1 / n$ · $L 1 / n$ ·cm^-2)	n	R²
PVDF	0.1050	0.0826	0.9892	0.0398	5.757	0.8186
PVDF/ZrO₂-2%	0.2056	0.1133	0.9464	0.0717	4.994	0.7188

Table 3 Fitting results of isotherm curves of ZrO2 and PVDF/ZrO2 membranes

Sample	Langmiur equation			Freundlich equation
Sample	Q_e/(mg·cm^-2)	K_a/(L·mg^-1)	R²	K_F/(m $g 1 - 1 / n$ · $L 1 / n$ ·cm^-2)	n	R²
PVDF	0.1050	0.0826	0.9892	0.0398	5.757	0.8186
PVDF/ZrO₂-2%	0.2056	0.1133	0.9464	0.0717	4.994	0.7188

Fig.7 Adsorption capacities of BHb on PVDF(a) and PVDF/ZrO2-2%(b) under different NaCl concentrations

Fig.8 Adsorption kinetics of BHb on PVDF/ZrO2 with different ZrO2 loading amounts

Table 4 Elution rates of adsorbed BHb with different eluants

Eluant	Tris-HCl solution(pH=8.8)	SDS(0.5%)	SDS(1%)	NaCl(0.1 mol/L)
Eluant rates(%)	19.76	61.94	64.39	73.70

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Synthesis of PVDF/ZrO₂ Hybrid Membranes and Its Adsorption Property Toward Bovine Hemoglobin^†

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