Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 71, Issue 3, Pages 315-323Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2009.12.017
Keywords
Heterogeneous catalyst; iron pillared vermiculite; Photocatalytic degradation; Reactive brilliant orange; Kinetics
Categories
Funding
- Program for National Science Foundation of China [40973075, 40573064]
- New Century Excellent Talents Program
- Ministry of Education, China [NCET-06-0747]
- Science and Technology Plan of Guangdong Province, China [20088030302036, 2006836601004, 20098050900005]
- Natural Science Foundation of Guangdong Province, China [9351064101000001, 06025666, 04020017]
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In the present study, a novel heterogeneous photo-Fenton catalyst was prepared by iron pillared vermiculite (Fe-VT). The catalyst Fe-VT was characterized by laser particle size analyzer, X-ray diffraction (XRD), X-ray fluorescence (XRF), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) methods. It was found that hydroxy-Fe of low polymerization degree intercalated into the silicate layers of vermiculite successfully. Under the following experimental conditions: 100 mg/L reactive brilliant orange X-GN (named as X-GN) solution, pH 3, 30 degrees C, 3.92 mM H2O2 and 0.5 g/L Fe-VT dosage, 98.7% decoloration and 54.4% TOC removal could be achieved with 75 min UV irradiation. The kinetics results showed that decoloration kinetics of X-GN was well fitted by a pseudo-first order equation. In addition, the maximum dissolved iron, determined by atomic absorption spectrophotometer (AAS), was less than 1 ppm, while decoloration efficiency was till higher than 90% after the catalyst Fe-VT being used for 3 cycles. Hence, taking into account the favorable photocatalytic properties and low leaching of iron ions, iron pillared vermiculite is a promising catalyst for dye wastewater treatment. (C) 2010 Elsevier B.V. All rights reserved.
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