Preparation of Fluorescence Polyurea Microspheres Through Precipitation Polymerization and Their Use for Fe3+ Determination†

doi:10.7503/cjcu20180788

Abstract

Abstract:

Uniform and fluorescent polyurea microspheres(FPU) were synthesized via precipitation polymerization of isophorone diisocyanate in water/acetone mixture, bonding different amount amino-functionalized 1,8-naphthalimide(AABD) as fluorescent chromorephore. The chemical structure of AABD was confirmed by ¹H NMR and FTIR spectra. The AABD content in FPU was investigated by UV-Vis spectroscopy, and the enhanced properties of FPU was characterized by fluorescent spectroscopy. The results showed that, the uniform FPU microspheres of about 5 μm in diameter exhibited considerable green fluorescence emission at 522 nm when they were excited at 420 nm, and the fluorescence intensity was significant enhacced in comparsion with pure AABD in water or FPU dissolved in N-methyl pyrrolidone at the same concentration of AABD units. A linear decrease in fluorescence intensity of FPU was observed with increased Fe³⁺ concentration changed from 10^-4 mol/L to 10^-3 mol/L. This provides a potential application for AABD-containing FPU for Fe³⁺ determination in aqueous systems.

Key words: Fluorescence polyurea microsphere, Precipitation polymerization, Ferric ion detection

CLC Number:

O631

TrendMD:

GONG Minghui,YANG Shanshan,LI Shusheng,KUANG Rui,KONG Xiangzheng. Preparation of Fluorescence Polyurea Microspheres Through Precipitation Polymerization and Their Use for Fe³⁺ Determination^†[J]. Chem. J. Chinese Universities, 2019, 40(6): 1317.

Figures/Tables 9

Scheme 1 Syntheses of AABD and fluorescence polyurea microspheres FPU

Fig.1 FTIR(A) and 1H NMR(B) spectra of BAD(a), AABD(b) and FPU(c)

Fig.2 LSCM(A) and SEM(B) images of FPU

Fig.3 UV-Vis spectra of AABD in NMP at different concentration, and relationship of the maximum absorbance peak with AABD(inset)(A) and FPU in NMP(0.1%, mass fraction)(B)

Table 1 FPU preparation through precipitation polymerization of IPDI in water in the presence of AABD and AABD content in FPU determined by UV-Vis spectra*

Sample	m(IPDI)/g	m(AABD)/g	Sphere yield(%)	c(AABD)/(10^-5 mol·g^-1)		Converted into FPU(%)
Sample	m(IPDI)/g	m(AABD)/g	Sphere yield(%)	Feed	UV-Vis	Converted into FPU(%)
FPU1	2	0.0103	79.32	1.472	1.723	93.33
FPU2	2	0.0275	81.30	3.867	4.606	96.84
FPU3	2	0.0447	80.68	6.799	7.504	89.05

Fig.4 Fluorescent excitation and emission spectra of dried FPU powder(A), fluorescent emission spectra of AABD in water(B), and those of FPU dissolved in NMP(C) or dispersed in water(D) at different AABD unit concentrations

Scheme 2 Possible formation of intermolecular exciplex for AABD mlecules

Fig.5 Fluorescence spectra of FPU(10-5 mol/L of AABD unit) dispersed in aqueous solutions of different ions(6×10-4 mol/L)(A) and those of PPU in water of different Fe3+ concentration, and relationship of the maximum fluorescence peak value versus Fe3+ concentration(inset)(B)

Scheme 3 Possible binding of Fe3+ with AABD in FPU

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Preparation of Fluorescence Polyurea Microspheres Through Precipitation Polymerization and Their Use for Fe³⁺ Determination^†

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