Abstract
Background: A vital section of water pollution mostly comes from the dying industry, which contaminates the water bodies by discharging the effluents into them. Naturally, it is carcinogenic as it contains harmful chemicals and minerals. To prevent this , many researchers have studied the issue and came to an inference that Methylene blue should be removed from wastewater. Many researchers and scientists proposed that Zeolite with little modifications could be one of the feasible options for catalytic oxidation of dyes in wastewater. Our focus is mostly based on Molybdenum impregnated H-ZSM-5 to catalytically oxidize methylene blue present in wastewater.
Objective: This method examined the Catalytic oxidation of wastewater containing Methylene Blue by the application of Mo-ZSM-5.
Methods: Raw H-ZSM-5 was activated and impregnated with previously prepared MoCl5 and allowed to dry and calcine at the required temperature. The product was characterized by Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy and BET Surface Area Analyser methods. Catalytic oxidation reactions were carried out at room temperature using hydrogen peroxide as oxidant. The effect of each parameter was investigated vividly.
Results: From the Energy Dispersive X-ray Spectroscopy method, it was observed that the percentage for Molybdenum over H-ZSM-5 was 9%. Surface area analysis suggested that the value for the surface area of unimpregnated H-ZSM-5 was 511 m2/g for 5% impregnation and 307 m2/g for 10% metal impregnation. A sharp decrease in the surface area was observed. Scanning Electron Microscopy images depict that the crystalline structure of raw H-ZSM-5 would not be damaged due to metal impregnation. Its shape and size were unaltered. In the images, the porous surface was observed.
Conclusion: Zeolites are an important catalyst in active phases for acidic/basic/redox catalysed reactions. Its activity and selectivity affected by the crystalline structure as well as morphological properties. Molybdenum impregnated H-ZSM-5 catalyst is best popularly known for its shape selectivity property. It promotes faster decomposition of H2O2 to non-reactive O2, which shows poor oxidation activity.
Keywords: Zeolites, impregnation, catalyticoxidation, methylene blue, Molybdenum ZSM5, wastewater.
Graphical Abstract
[http://dx.doi.org/10.1039/FT9928800385]
[http://dx.doi.org/10.1016/S0920-5861(98)00202-8]
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