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Decolourization Of Drimarene Red Dye Using Palladized Bacterial Cellulose In A Reactor

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The overall goal of the research project was to explore the possibility of using metallic palladium (Pd0) that has been irreversibly immobilized on bacterial cellulose (palladized bacterial cellulose) as a versatile and novel bio-inorganic catalyst to mediate reductive decolourization of a reactive textile dye, Drimarene Red dye in a rotating catalyst contact reactor (RCCR). Ninty percent of 100 mg L−1 of dye was decolourized at pH 2 after 25 min of reaction in RCCR using hydrogen as the reducing agent. Preliminary characterization of the bio-inorganic catalyst through scanning electron microscopy and energy dispersive X-ray spectroscopic analyses clearly suggested the irreversible impregnation of nano-sized Pd0 deposits within the bacterial cellulose fibrils. The kinetics of decolourization using varying initial concentrations of the selected textile dye, and effects of pH and RPM (revolutions per minute) on the rate of decolourization of dye were studied. The first order rate constant values were computed to be 0.086 min−1, 0.084 min−1, 0.083 min−1, 0.081 min−1 and 0.072 min−1 for 40 mg L−1, 60 mg L−1, 80 mg L−1, 100 mg L−1 and 150 mg L−1, respectively. The rate of decolourization remained unaffected by the speed of rotation of discs in RCCR and decreased significantly with the increase in pH of the reaction phase. UV-Visible absorption spectroscopy and liquid chromatography-mass spectroscopy suggested the accumulation of sulfanilic acid and other low molecular weight products possibly due to the cleavage of azo bonds in the dye molecule. Results obtained so far suggest that rotating catalyst contact reactor is simple and flexible with respect to: a) immobilization of bacterial cellulose onto rotating discs and b) in-situ reduction and immobilization of palladium onto bacterial cellulose and c) operation in batch or continuous flow mode. Irreversible immobilization of palladium and its extensive reusability is expected to reduce the cost of treatment process to a significant extent.

Document Type: Research Article


Publication date: January 1, 2008

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