Removal of Low Concentration Formaldehyde in Indoor Air by Chemisorption / 环境与健康杂志

ABSTRACT

Objective To remove formaldehyde of the low concentration in the indoor air and purify the indoor air. Methods The concentration of formaldehyde was determined by MBTH spectrophotometry and the removal efficiency of low concentration formaldehyde in the indoor air by using sodium sulfite, sodium bisulfite, ammonium sulfate, ammonium chloride, ammonium molybdate and potassium permanganate was tested. Results As the concentration of formaldehyde was at 1 mg/L, 10 mg/L and 100 mg/L respectively, the removal rate of formaldehyde of sodium sulfite, sodium bisulfite and potassium permanganate was 15.9%, 74.7% and 93.5% respectively. On the acidity condition or alkalescence, potassium permanganate was also effective in removing of the different concentration formaldehyde was 23.8%, 74.7% and 93.5%. Ammonium molybdate and potassium permanganate could remove the formaldehyde by 25.9% and 35.7% when the concentration of formaldehyde was at 10 mg/L and 100 mg/L. Ammonium sulfate or ammonium chloride could not effectively remove the low concentration formaldehyde and the removal rate was under 7.0%. Conclusion On the acidity condition or alkalescence, potassium permanganate is effective in removing of the low concentration formaldehyde in the indoor air.