Synthesis of Polystyrene/silver Nanoparticels Composite Spheres and Their Catalytical Application†

doi:10.7503/cjcu20170159

Abstract

Abstract:

This study reports the preparation of polystyrene/Ag nanoparticles(PS/Ag NPs) composite spheres and their catalytic application toward MB conversion. The composite spheres were prepared by synthesis of PS speres, their sulfonation, and finally reduction of [Ag(NH₃)₂]⁺ ions absorbed on sulfonated PS spheres using polyvinyl pyrrolidone. The resultant PS/Ag NPs composite spheres were characterized using scanning electron miscroscopy, transmission electron microscopy, UV-Vis spectroscopy, Infrared spectroscopy and X-ray diffraction spectroscopy, and their catalytic properties were examined. These results show that small Ag NPs with diameter of about 9—18 nm were well dispersed on the PS spheres and the PS/Ag NPs composite exhibits excellent catalytic activity towards MB conversion without obvious deteriorating after five cycles of running. This study, thus, may have impact on the degradation of organic contaminants in water.

Key words: Polystyrene sphere, Ag nanoparticles, Catalysis, Methyl blue, Organic contaminant

CLC Number:

O643

TrendMD:

SHEN Xiaohua, HU Jiawen. Synthesis of Polystyrene/silver Nanoparticels Composite Spheres and Their Catalytical Application^†[J]. Chem. J. Chinese Universities, 2017, 38(11): 2015.

Figures/Tables 11

Fig.1 SEM images of PS spheres(A) and sulfonated PS spheres(B)

Fig.2 FTIR spectra for PS spheres(A) and sulfonated PS spheres(B)

Fig.3 SEM images of the PS/Ag NPs composite spheres prepared from 0.29 mol/L(A), 0.58 mol/L(B), 0.87 mol/L(C) and 1.16 mol/L(D) [Ag(NH3)2]+ solutions

Fig.4 TEM images(A—D) for the PS/Ag NPs composite spheres prepared from 0.29 mol/L(A, A'), 0.58 mol/L(B, B'), 0.87 mol/L(C, C') and 1.16 mol/L(D, D') [Ag(NH3)2]+ solutions and corresponding size distributions(A'—D') of Ag NPs on the PS spheres

Fig.5 XRD patterns(A) for PS spheres(a), PS/Ag NPs composite spheres(b) and standard pattern for Ag(c) and UV-Vis spectra(B) of PS/Ag NPs composite crospheres prepared from 0.29 mol/L(a), 0.58 mol/L(b), 0.87 mol/L(c) and 1.16 mol/L(d) [Ag(NH3)2]+ solutions

Fig.6 Schematic showing the reduction mechanism of MB on the PS/Ag NPs composite spheres(A) and time-dependent UV-Vis spectra for MB solution(0.04 mmol/L) without catalyst(B) and in the presence of sulfonated PS spheres(C) and pure Ag NPs(D)

Fig.7 Time-dependent UV-Vis spectra for MB solution(0.04 mmol/L) in the presence of PS/Ag NPs composite spheres prepared from 0.29(A), 0.58(B), 0.87(C) and 1.16 mol/L(D) [Ag(NH3)2]+ solutions

Fig.8 Conversion efficiency of MB solution with different initial concentration in the presence of PS/Ag NPs composite(1.1 mg, prepared from 1.16 mol/L [Ag(NH3)2]+ solution)

Fig.9 Natural logarithm of the absorbance ratio(A/A0) at λmax vs. the reduction time extracted from the time-dependent UV-Vis spectra

Table 1 Comparison of normalized kinetic constant of different catalysts used for the conversion of MB

Material	Temperature/℃	Ag NPs diameter/nm	k/(s^-1·mg^-1)	Ref.
Poly(S-co-HEA)/Ag NPs	r. t.	23.0	6.60×10^-4	[25]
Fe₃O₄@polydopamine-Ag microspheres	25	25.0	1.43×10^-3	[24]
Ag NPs on Fe₃O₄@C nanocomposites	25	10.0	5.67×10^-4	[26]
LCPS/Ag NPs	25	40.0	1.62×10^-3	[27]
P(St-NaSS)/Ag NPs	25	19.2	2.60×10^-3	[28]
PS/Ag NPs composite spheres	25	18.5	2.42×10^-3	This work

Fig.10 Covertic degradation kinetics for MB solution in five cycles with the presence of PS/Ag NPs composite spheres(prepared from 1.16 mol/L [Ag(NH3)2]+ solution)(A) and absorbance intensity variation for each cycle(B)

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