Preparation and Characterization of Fe3O4/TiO2 Composites by Heteroagglomeration

Fisli, Adel; Saridewi, Rahmi; Dewi, Sari Hasnah; Gunlazuardi, Jarnuzi

doi:10.4028/www.scientific.net/AMR.626.131

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HomeAdvanced Materials ResearchAdvanced Materials Engineering and TechnologyPreparation and Characterization of Fe3O4/TiO2...

Preparation and Characterization of Fe₃O₄/TiO₂ Composites by Heteroagglomeration

Abstract:

Fe₃O₄/TiO₂ composites were prepared by heteroagglomeration. The composites of different Fe₃O₄to TiO₂ weight ratio were prepared by mixing of prepared Fe₃O₄ with TiO₂ in aqueous slurry, under ultrasonic treatment. All prepared samples were characterized by XRD, VSM, SEM/EDS, raman spectroscopy and BET. The prepared composites contained TiO₂ (anatase and rutile) and Fe₃O₄ crystal phases. The magnetization hysteresis loop for Fe₃O₄/TiO₂ nanocomposites indicated that the hybrid catalyst showed superparamagnetic characteristics at room temperature. Photocatalytic performance of the prepared composites was examined by its ability to degrade methylene blue dye in aqueous solution. The photocatalytic activity of Fe₃O₄/TiO₂ composites was lower than that of pure TiO₂ sample because of the presence of non-active photocatalytic in composite (iron oxide). Under UV irradiation, the photocatalytic activity of Fe₃O₄/TiO₂ (1:1) composite was relatively similar to Fe₃O₄/TiO₂ (1:2), however, under sunlight irradiation, the photocatalytic activity of Fe₃O₄/TiO₂ (1:2) composite was relatively increase. The Fe₃O₄/TiO₂ composite can be easily recovered from treated water in slurry-type reactor by the application of an external magnetic field.

Info:

Periodical:

Advanced Materials Research (Volume 626)

Main Theme:

Advanced Materials Engineering and Technology

Edited by:

Mohd Mustafa Al Bakri Abdullah, Liyana Jamaludin, Rafiza Abdul Razak, Zarina Yahya and Kamarudin Hussin

Pages:

131-137

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.626.131

Citation:

A. Fisli et al., "Preparation and Characterization of Fe₃O₄/TiO₂ Composites by Heteroagglomeration", Advanced Materials Research, Vol. 626, pp. 131-137, 2013

Online since:

December 2012

Authors:

Adel Fisli, Rahmi Saridewi, Sari Hasnah Dewi, Jarnuzi Gunlazuardi

Keywords:

Composite, Heteroagglomeration, Magnetic Nanoparticles, Photocatalysis

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Paper TitlePages

Facile Fabrication of Taper-Like BiVO₄ Nanorods with High Photocatalytic Property under Sunlight Irradiation

Authors: Lin Rui Hou, Chang Zhou Yuan

Abstract: We report the synthesis of the taper-like BiVO4 nanorods by employing a solid-state grinding synthetic strategy. The X-ray diffraction (XRD) indicates that the as-prepared BiVO4 nanorods were crystallized in a monoclinic system. The diameter and length of taper-like nanorods are confirmed by the scanning electron microscopy (SEM) technology. The diameter and length of the taper-like nanorods are 100 nm and 1 μm, respectively. And the photocatalytic activity of the taper-like BiVO4 nanorods was evaluated by measuring the degradation of methylene blue (MB) in water under sunlight irradiation. MB was degraded nearly to nothing under sunlight irradiation for 120 min at room temperature in air. These results indicate the as-prepared product is a good sun-driven photocatalyst. In addition, the degradation mechanism of methylene blue over BiVO4 nanorods was tentatively investigated.

Synthesis of Magnetic TiO₂ Nanoparticles as Bactericidal Photocatalyst

Authors: Ching Ju Monica Chin, Yu Jie Chang, Guo Jie Weng, Chia Yu Shen

Abstract: The magnetic photocatalysts can provide both a high specific surface area and an alternative for recovering used catalyst from treated water by the application of a magnetic field. In this study, the Fe3O4 nanoparticles were synthesized by co-precipitation. After chemical co-precipitation of ferric and ferrous solution under alkaline condition, the suspension of magnetite nanoparticles were then mixed with TEOT (Titanium (Ⅳ) ethoxide) for sol-gel coating. The separated MPCs (magnetic photocatalyst nanoparticle) were then dried and calcined in 400oC. Magnetic properties of MPCs were identified by superconducting quantum interference device magnetometer (SQUID). The bactericidal ability of synthesized MPCs was evaluated by counting the residual numbers of E. coli after irradiation under a light intensity of 1.0 mW/cm2 at 365 nm. The results show that the MPCs were both anatase and had good crystallinity with clear peaks and insignificant noises after calcination. The SQUID test also reveals that calcination only affects the magnetic susceptibility of the MPC nanoparticles slightly (< 8%). The bactericidal ability of the synthesized MPCs was compared with the commercial TiO2 nanoparticle DegussaTM P25; P25 provided a faster inactivation rate for E. coli in water than MPCs did at the same dosage. The calculated photocatalytic bactericidal rate by P25 is about 3.6 times faster than that by MPCs synthesized in this work. However, the bactericidal rate of magnetic TiO2 synthesized in this work was 5 times than that of other MPCs in the literature. The particles size and surface area of MPCs from this work were about 135 nm and 210 m2/g, respectively. The MPCs from this work have much smaller size and larger surface area; hence there are more active sites for bactericidal reaction.

260

Synthesis and Characterization of Attapulgite Clay Coated Ag/AgBr/TiO₂ Visible Light Photocatalyst

Authors: Xu Gu, Jin Long Jiang, Dong Li

Abstract: Attapulgite clay coated Ag/AgBr/TiO2 visible light photocatalyst was prepared by an impregnation-deposition-precipitation method. The catalyst was characterized via powder X-ray diffraction (XRD), TEM, UV-Vis spectroscopy, and EMAX, and their photocatalytic activity was examined by degradation of methylene blue in water under sunlight. The results showed that the catalyst exhibited high efficiency for the degradation of methylene blue and the catalyst activity maintained effectively after successive cyclic experiments under sunlight, attributed to adsorption of dye on attapulgite clay and high dispersion of AgBr and TiO2 nano-sized particles on the surface of attapulgite clay.

285

Preparation and Photocatalytic Properties of TiO₂-CoFe₂O₄ Magnetic Composite Photocatalyst

Authors: Dong Feng Sun, Zhi Jian Xu, Kai Wang, Gui Fu Dong, Xiu Ling Zhang

Abstract: A TiO₂-CoFe₂O₄ composite photocatalyst was prepared by one-step method with ultrasound technique using TiCl₄, trivalent iron salt and divalent cobalt salts as precursors. The properties of the sample were investigated by XRD, TEM and VSM techniques. The photocatalyst activity was evaluated by using methyl orange aqueous solution as the model contaminant under the sunlight. The results showed that the TiO₂-CoFe₂O₄ composite photocatalyst exhibited good magnetic properties and the saturation magnetization was 212Gs. The microstructure of samples consists of the TiO₂ with anatase phase and CoFe₂O₄ with spinel structure. The size of TiO₂-CoFe₂O₄ particles is approximately 20 nm in diameter. The photocatalyst test showed highly photocatalytic activity in the sunlight.

1488

Synthesis of AgCl/BiOCl Composite Photocatalyst and its Photocatalytic Activity under Visible-Light Irradiation

Authors: Li Shan Zhang, Teng Fa Long, Chang Qi Yan, Xing Cun He, Meng Lin Cheng, Shan Zhong

Abstract: A series of BiOCl photocatalysts with different AgCl contents have been synthesized by a simple hydrolysis method at room temperature using BiCl3 and Bi(NO3)3•5H2O as the main raw materials. The resulting products were characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV‐vis diffuse reflectance spectra (DRS). The photocatalytic activities of these AgCl/BiOCl composites were evaluated by the degradation of rhodamine B (RhB) under UV and visible light. The results revealed that the BiOCl/AgCl with an initial 100:1 mole ratio of Bi to Ag have the highest photocatalytic activity. RhB (20 mg/L) was decolorized by 98.81% in 15 min under sun light, in contrast to 95.89% and 11.63% in 30 min under halogen lamp and UV light, respectively. The catalysts did not show any significant loss of activity after 19 recycles for the photodegradation of RhB, suggesting the photocatalyst is essential stable. Kinetic studies showed that the RhB photocatalytic degradation followed pseudo-first order kinetics reaction and fit the Langmuir-Hinshelwood kinetic equation. The rate controlling step was absorption reaction.

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