Colour Change of Red Iron Oxide by One-step Method Using Oxidant†

doi:10.7503/cjcu20180417

Abstract

Abstract:

Taking iron oxide red as raw material, iron oxide red with better quality was prepared by a one-step calcination method with sulfuric acid as oxidant. The results show that when iron oxide red and 60%(mass fraction) sulfuric acid were mixed and calcined at 750 ℃, the color of the product was the best. The results of XRD, SEM, HRTEM, UV-Vis and elemental analysis EDX show that the crystal form of iron oxide red was unchanged before and after calcination, but the morphology was more regular, the particle size was more uniform, and the color was more vivid after calcination.

Key words: Iron oxide red, Colour improvement, Visible light, Crystalline

CLC Number:

O614.8
O647

TrendMD:

JIANG Xue,FU Yao,HUANG Dan,GUO Yupeng. Colour Change of Red Iron Oxide by One-step Method Using Oxidant^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2734.

Figures/Tables 8

Fig.1 UV-Vis spectra of different ferric oxide samples

Fig.2 XRD patterns of different ferric oxide samplesa. F; b. F-S-60%; c. commercial sample iron red.

Fig.3 SEM images of samples F(A) and F-S-60%(B)

Fig.4 HRTEM images of samples F(A) and F-S-60%(B)

Fig.5 O1s XPS spectra of samples F(A) and F-S-60%(B)

Fig.6 Color of samples F(A) and F-S-60%(B)

Table 1 Color difference data of samples F and F-S-60%

Sample	L	a	b	ΔE
F	35.51	18.19	8.58	11.04
F-S-60%	38.70	27.97	17.38	2.57

Fig.7 Crystal configuration of original ferric oxide and new ferric oxide

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