Study on preparation of ceramic foams-based nickelic hydroxide catalyst and simulated sewage treatment

Abstract:

Activated carbon was used as the pore forming agent to prepare ceramic foams on which NiCl2 was loaded by impregnation, followed by reaction with NaClO and NaOH mixed solution to generate NiOOH catalyst. Methylene blue was employed as the sewage simulacrum, and the catalytic performance of NiOOH catalyst was measured by fading time of methylene blue. The dosages of catalyst and sodium hypochlorite, pH, and temperature were used as variables to explore the influences on catalytic effect of sewage treatment and determine the optimal combination conditions by the single factor and orthogonal test, respectively. The results indicate that the complete fading time of methylene blue is 131 min when the temperature, pH, dosages of catalyst and NaClO are 55 oC, 8, 1.0 g and 15.0 mL, respectively. Sequence of significant effect of factors on fading time of methylene blue is temperature > dosage of catalyst > pH >dosage of NaClO. The optimal practical combination conditions for sewage treatment are confirmed as that the temperature, pH value, and the dosages of catalyst and NaClO are 35 oC, 8, 1.0 g, and 15.0 mL, respectively.