Photocatalytic Performance of Fe-complexes Prepared Using Cotton Fiber Modified with Different Dicarboxylic Acids †

doi:10.7503/cjcu20190187

Abstract

Abstract:

Three dicarboxylic acids(DCAs), tartaric acid(TA), malic acid(MA) and succinic acd(SA), were used for the modification of cotton fiber to introduce carboxyl groups, respectively, which then coordinated with Fe ³⁺ ions to prepare the modified cotton fiber Fe complexes, Fe-DCA-Cotton. Effects of cha-racteristic structure and concentration of dicarboxylic acids on carboxyl group content(Q_COOH) of the modified cotton fiber and Fe content(Q_Fe) of the resulting Fe complexes were investigated. The catalytic activities of three Fe-DCA-cotton complexes as photocatalysts for the oxidative degradation of organic dye and Cr(Ⅵ) reduction were evaluated and compared. The results indicated that Q_COOH of the modified cotton fiber increased with concentration of carboxylic acid increasing. SA without hydroxyl group could give cotton fiber more carboxyl groups than the two hydroxyl dicarboxylic acids, TA and MA. However, the Fe complexes prepared with Fe ³⁺ ions and two hydroxyl dicarboxylic acids showed higher Q_Fevalues. The three Fe-DCA-cotton complexes exhibited significant photocatalytic performance for the oxidative degradation of organic dye and Cr(Ⅵ) reduction. Increasing Q_Fe and irradiation could enhance their catalytic activity. Fe-TA-cotton complex has a better photocatalytic activity than the two complexes. Besides, the three complexes could not only reduce Cr(Ⅵ) into Cr(Ⅲ) ion, but also partially remove it through adsorption effect. Fe-MA-cotton complex showed relatively high Cr removal efficiency.

Key words: Dicarboxylic acid, Fe complex, Photocatalyst, Dye degradation, Cr(Ⅵ) reduction

CLC Number:

O643.32

TrendMD:

GAN Lu,DONG Yongchun. Photocatalytic Performance of Fe-complexes Prepared Using Cotton Fiber Modified with Different Dicarboxylic Acids ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2205.

Figures/Tables 11

Fig.1 Molecular structures of three DCAs

Scheme 1 Synthetic routes of Fe-DCA-Cotton

Fig.2 Effect of DCAs concentration on QCOOH value of DCA-Cotton

Fig.3 Relationship between QCOOH and QFe values of three Fe-DCA-Cotton

Fig.4 Intermolecular(A) and intramolecular(B—D) coordination of Fe3+ ions with DCA-Cotton

Fig.5 FTIR(A, B), XPS(C) and DRS(D) spectra of three Fe-DCA-Cotton

Fig.6 XRD patterns of cotton fiber(a), Fe-TA-Cotton(b), Fe-MA-Cotton(c) and Fe-SA-Cotton(d)

Fig.7 Effects of QFe value of Fe-DCA-Cotton on D30 and R30

Fig.8 Photocatalytic mechanism of Fe-DCA-Cotton for dye degradation and Cr(Ⅵ) reduction

Fig.9 Effect of irradiation on D50 and R50 with Fe-DCA-Cotton (A) Dye degradation; (B) Cr(Ⅵ) reduction.

Fig.10 Cr species removal performance of three Fe-DCA-Cotton samples(A) and XPS spectra of Cr2p on Fe-MA-Cotton before(a) and after(b) removal test(B)

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