RESUMO
Objective To research the removal of the low concentration of formaldehyde in the indoor air by using copper sulfate.Methods The low concentration of formaldehyde(10.0 mg/L)in the indoor air was determined by the way of MBTH spectrophotometry.The influence of pH,chelon and concentration on the removal of different concentration formaldehyde was investigated by the way of chemisorption.Results When pH was 11.99,12.86,13.08 and 13.42,using copper sulfate,the removal rate of 10.0 mg/L formaldehyde was 43.82%,62.75%,69.21% and 73.40% respectively.When the concentration of copper sulfate was at 3.0 g/L,5.0 g/L,7.0 g/L and 10.0 g/L,the removal rate was 51.43%,73.40%,66.36% and 62.18% respectively in the condition of pH=13.42.When used potassium sodium tartrate and EDTA as the ehelon,pH=13.42,concentration of copper sulfate was 5.0 g/L,the removal rate of 2.0 mg/L formaldehyde was 77.21% and 62.51% respectively,that of 10.0 mg/L formaldehyde was 86.54% and 73.40% respectively,that of 100.0mg/L formaldehyde was 96.71% and 91.32% respectively.Conclusion Using potassium sodium tartrate as the chelon,at pH=13.42,5.0 g/L copper sulfate can produce a good removal efficiency for indoor low level formaldehyde.