Preparation and Decontamination Capability of Hollow Zn-Cr Ferrite/Titanium Dioxide Composites†

doi:10.7503/cjcu20160340

Abstract

Abstract:

Homogeneous and dispersive carbon nanosphere was synthesized by hydrothermal method using glucose as the material. Hollow Cr-Zn ferrite was prepared by coprecipitation method and thermal treatment technology using carbon sphere as template. Ferrite/titanium dioxide composites were obtained by coating titanium dioxide on the ferrite using tetrabutyltitanate as titanic source. The structure, morphology, electromagnetic performance of as-prepared samples and their absorptivity and degradability on dye wastewater were studied by modern analytical techniques. The results showed that the hollow ZnCr_0.25Fe_1.75O₄ has preferable photocatalytic property on dye wastewater, and its removal efficiency on methyl orange and Rhodamine B are about 87% and 83%, respectively. The coating of TiO₂ on the ferrite could improve photocatalytic activity of as-prepared sample, the ZnCr_0.25Fe_1.75O₄/TiO₂ composite with 23.08% of TiO₂ content has excellent photo-catalytic activity, and is equivalent to pure TiO₂.

Key words: Hollow ferrite, Titanium dioxide, Photocatalytic, Methyl orange, Rhodamine B

CLC Number:

O647
TB34

TrendMD:

SUN Daihong, LIU Huarong, LI Ruizhe. Preparation and Decontamination Capability of Hollow Zn-Cr Ferrite/Titanium Dioxide Composites^†[J]. Chem. J. Chinese Universities, 2016, 37(11): 2050.

Figures/Tables 16

Table 1 Chemical component of as-prepared samples*

Sample		Content(%)
Sample		Zn²⁺	Cr³⁺	Fe³⁺	Ti⁴⁺
ZnCr_xFe₂_-xO₄	x=0.25	27.04(27.23)	5.47(5.41)	40.46(40.70)	0
	x=0.50	27.08(27.35)	10.98(10.87)	35.18(35.03)	0
	x=0.75	27.18(27.46)	16.52(16.38)	29.07(29.31)	0
	x=1.00	27.26(27.57)	22.13(21.92)	23.36(23.54)	0
ZCF with m_T/ZCF	m_T/ZCF=0.1	24.58(24.76)	5.03(4.95)	37.34(37.00)	5.38(5.45)
	m_T/ZCF=0.2	22.50(22.69)	4.64(4.51)	34.18(33.92)	9.86(9.99)
	m_T/ZCF=0.3	20.83(20.95)	4.20(4.16)	31.52(31.31)	13.72(13.83)
	m_T/ZCF=0.4	19.36(19.45)	3.91(3.86)	29.32(29.07)	16.95(17.12)
	m_T/ZCF=0.5	18.02(18.15)	3.64(3.61)	27.36(27.13)	19.81(19.98)

Fig.1 XRD patterns of ZnCrxFe2-xO4(x=0.25, 0.50, 0.75, 1.00)(A) and ZCF(a), TiO2(b) and ZCF/T composites with mT/ZCF =0.1, 0.2, 0.3, 0.4, 0.5(c—g)(B)

Fig.2 XPS spectra of the ZCF/T composite(A) ZCF/T; (B) Ti2p; (C) Cr2p; (D) Fe2p; (E) Zn2p.

Fig.3 SEM and TEM images of carbon microballoons(A, E), ZnCr0.25Fe1.75O4(B, F) and ZCF/T composite with mT/ZCF=0.3(C, G), unsintered C/ZnCr0.25Fe1.75O4(D) and element mapping of ZCF/T composite with mT/ZCF=0.3(H—L)(H) O-K; (I) Ti-K; (J) Cr-K; (K) Fe-K; (L) Zn-K.

Fig.4 FTIR spectra(A) and Raman spectra(B) of ZnCr0.25Fe1.75O4(a), ZCF/T composite with mT/ZCF=0.3(b) and TiO2(c)

Fig.5 Hysteresis loop patterns of ZnCr0.25Fe1.75O4(a) and mT/ZCF=0.3 ZCF/T composites(b) at room temperature

Fig.6 Removal effect of ZnCrxFe2-xO4 on time for MO(A) and RhB(B) solutionsa. x=0.25; b. x=0.50; c. x=0.75; d. x=1.00.

Table 2 Average pore size and specific surface area of samples

Sample	Average pore size/nm	Specific surface area/(m²·g^-1)	Sample	Average pore size/nm	Specific surface area/(m²·g^-1)
ZnCr_0.25Fe_1.75O₄	8.56	74.83	ZCF/T, m_T/ZCF=0.2	7.32	62.17
ZnCr_0.50Fe_1.50O₄	8.31	71.35	ZCF/T, m_T/ZCF=0.3	7.21	60.33
ZnCr_0.75Fe_1.25O₄	8.14	68.57	ZCF/T, m_T/ZCF=0.4	6.28	56.81
ZnCrFeO₄	7.87	66.42	ZCF/T, m_T/ZCF=0.5	6.04	55.16
ZCF/T, m_T/ZCF=0.1	7.54	63.92

Fig.7 Removal effect of recyclable ZnCr0.25Fe1.75O4 for MO(A) and RhB(B) solutions

Fig.8 Removal effect of ZnCr0.25Fe1.75O4, ZCF/T composites and TiO2 on time for MO(A) and RhB(B) solutions

Fig.9 Removal effect of ZCF/T composite with mT/ZCF=0.3 on pH value for MO(A) and RhB(B) solutions pH:a. 5; b. 6; c. 7.

Fig.10 Removal effect of ZCF/T composite with mT/ZCF=0.3 on hydrolysis time for MO(A) and RhB(B) solutions Time/h:a. 8; b. 12; c. 16; d. 24.

Fig.11 Removal effect of ZCF/T composite with mT/ZCF=0.3 on sintering temperature for MO(A) and RhB(B) solutions Temperature/℃: a. 400; b. 450; c. 500; d. 550.

Fig.12 Removal effect of ZCF/T composite with mT/ZCF=0.3 on cycle numbers for MO(A) and RhB(B) solutions and recycled schematic diagram[RhB solution before(C) and after(D) by ultraviolet treatment and recycled composite by an external magnet(E)]

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