硫酸铜去除室内空气中低浓度甲醛的液相吸收法

Removal of Low Concentration Formaldehyde in Indoor Air by Chemisorption Using Copper Sulfate

目的研究硫酸铜对室内空气中低浓度甲醛的去除。方法以酚试剂分光光度法测定甲醛浓度,采用液相吸收法研究了在不同 pH 值(11.99、12.86、13.08、13.42)、硫酸铜浓度(3.0、5.0、7.0、10.0g/L)、络合剂[酒石酸钾钠与乙二胺四乙酸二钠(EDTA)]3种因素下,硫酸铜对低浓度甲醛的去除效果。结果 pH 值分别为11.99、12.86、13.08、13.42时,硫酸铜对10.0 mg/L 甲醛的去除率分别为43.82%,62.75%,69.21%,73.40%;当 pH=13.42、硫酸铜的浓度分别为3.0、5.0、7.0、10.0g/L时,对10.0mg/L 甲醛的去除率分别为51.43%,73.40%,66.36%,62.18%。当 pH=13.42、硫酸铜的浓度为5.0g/L 时,在以酒石酸钾钠与 EDTA 为络合剂的条件下,对2.0mg/L 甲醛的去除率分别为77.21%,62.51%;对10.0mg/L甲醛的去除率分别为86.54%,73.40%;对100.0mg/L 甲醛的去除率分别为96.71%,91.32%。结论 pH=13.42、络合剂为酒石酸钾钠时,5.0g/L 的硫酸铜对室内空气中低浓度甲醛去除效果良好、稳定。

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 tarxate and EDTA as the chelon, 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.