Fe?5A catalyst was prepared by wet impregnation method using Fe(NO3)3?9H2O and column 5A zeolite as raw materials. Batch experiments using Fe?5A as catalysts were conducted to investigate the effects of pH and temperature on methylene blue conversion. In addition, the effects of catalysts filling amount, feed flow rate, temperature and inlet methylene blue concentration on the of methylene blue degradation performance using Fe?5A catalyst in a continuous fixed bed reactor were studied. The results showed that the conversion rate was 95.9% at 20 min when the inlet methylene blue concentration was 50 mg/L, temperature was 70℃ and pH was 2. The conversion of methylene blue decreased with the decrease of temperature or the increase of flow rate during the fixed bed reaction. The change of methylene blue conversion rate and chemical oxygen demand (COD) conversion rate were very small as the increase of inlet methylene blue concentration. The conversion rates of methylene blue and COD were above 98% and 82%, respectively, and iron leaching concentration was below 3.5 mg/L under the conditions of initial concentration of methylene blue 50?300 mg/L, temperature of 70℃, pH of 2, feed flow rate of 4 mL/min, and Fe?5A catalyst filling amount of 1.25 g when the fixed bed was running continuously for 5 h. The methylene blue (50 mg/L) conversion rate was only 73.3% in the fixed bed of 2.5 g 5A zeolite at the same experimental conditions.
Jian LIU Yanxiang WANG Gang PENG Huiping ZHANG
. Catalytic Wet Peroxide Oxidation of Methylene Blue Solution Using Fe-5A[J]. The Chinese Journal of Process Engineering, 2018
, 18(3)
: 646
-651
.
DOI: 10.12034/j.issn.1009-606X.217321
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