Fe-pillared montmorillonite as effective heterogeneous Fenton catalyst for the decolorization of methyl orange
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Fe-pillared montmorillonite as effective heterogeneous Fenton catalyst for the decolorization of methyl orange GUI-QIU HUANGa, GUO-JIN QIb, TIAN-YU GAOb, JIAN ZHANGc and YONG-HUA ZHAOb,* a Guangxi
Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization, School of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 535 011, China b School of Chemistry and Environmental Engineering, Liaoning University of Technology, Jinzhou 121 001, China c General Administration of Quality Supervision of Petroleum and Natural Gas Projects, Langfang 065 000, China E-mail: [email protected] MS received 12 March 2020; revised 26 May 2020; accepted 9 June 2020
Abstract. The natural Na-type montmorillonite (Na-MMT) was pillared by iron polycation to obtain Fepillared montmorillonite (Fe-MMT). The materials were characterized by X-ray powder diffraction and N2 adsorption–desorption at low temperature. It was found that iron polycation was successfully inserted into MMT layers, and the textural properties of Fe-MMT could be adjusted by altering the amount of iron. Meanwhile, the decolorization of methyl orange (MO) by heterogeneous Fenton-like oxidation using Fe-MMT as catalyst was evaluated. The experimental results showed that Fe-MMT exhibited good decolorization performance of MO under 2.0 g L-1 of Fe-MMT-1.5, initial pH of solution 4, reaction time 90 min, and H2O2 concentration of 5 mmol L-1. Fe-MMT exhibited good stability for the decolorization of MO in solution for three successive runs. The decolorization process could be well described by pseudo firstorder kinetics model. Keywords. Fenton-like; Fe-pillared montmorillonite; methyl orange; decolorization; dye wastewater.
1. Introduction With the development of dye industry, the discharge of dye wastewater has increased greatly, which has become one of the main sources of pollution in water. The treatment of dye wastewater is strenuous due to its characteristics of complicated organic matter composition, color depth, toxicity and hard-biodegradation.1–3 The traditional treatment methods of dye wastewater mainly include physical adsorption, biological decomposition, chemical oxidation, coagulation and so on, each of which has its own advantages and disadvantages. Physical adsorption and coagulation have been used to remove contaminants from the wastewater through physical action, but they cannot change the chemical structure of the contaminants and would not fundamentally eliminate pollution.1,2,4 Biological treatment has the characteristics of high efficiency, stable operating conditions, and can remove large
amounts of organic pollutants in water. However, biological treatment cannot treat unconventional organic pollutants due to its limitation to microorganisms’ growth and metabolization conditions. Further, it has specific requirements for wastewater.5,6 In recent years, the chemical oxidation method featured by
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