Abstract:Porous ceramics with a high open porosity were prepared by employing low-cost kaolin, talcum powder, and alumina as major raw materials, cement as curing agent, and hydrophobic activated carbon powders as foam stabilizing agent via direct foaming. PdOOH catalyst was loaded on porous ceramics via immersion and reaction method. Methylene blue was used as the simulated pollutant in sewage, and also used as the degradable agent when sodium hypochlorite was decomposed by the palladium-based catalyst. Effects of the loaded amount of catalyst, temperature, and the amount of sodium hypochlorite on the degrading speed of methylene blue were investigated. The results indicate that the palladium catalyst loaded on porous ceramics can effectively catalyze the decomposition of sodium hypochlorite, and significantly improve the color fading speed of methylene blue by oxidation. The time required for color fading drastically decreases with the increment of temperature. It only needs 58 min for methylene blue (10mg/L, 50 mL) to fade to colorless when the temperature, the amounts of catalyst and sodium hypochlorite, and pH value are 40 oC, 0.4 g, 5 mL and 7.88, respectively.
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