Phthalic acid esters (PAEs) have been widely used in indoor applications and cause severe sicknesses. In this study, we developed an ionizer-assisted filtration method with an external electrostatic field to efficiently remove gaseous DiBP (Diisobutyl phthalate) and DnBP (Dibutyl phthalate). We used low-pressure drop polyurethane (PU) foams as substrate filters, and loaded fine activated carbon powder into PU foams as PU-C foams. The pressure drop of new filters ranged from 5.28 Pa to 14.3 Pa at the face velocity of 1 m/s. We investigated the influence of filter materials and electrostatic charging on the single-pass filtration efficiency of PAEs and net ozone production. The filtration efficiency of 30 ppi (pores per inch) filter increased from 15.4 % (PU) to 29.3 % (PU-C) for DiBP. Only pollutant pre-charging cannot enhance the filtration efficiency of PAEs. It may be because negative ions accumulate on the filter surface and cause electrostatic repulsive forces between the charged gaseous PAEs and filters, which lowers the electrostatic filtration efficiency. When charging the pollutants at -8.0 kV and the filter at +10.0 kV simultaneously, the filtration efficiency of 30 ppi PU-C filter increased from 29.3% to 45.5% for DiBP. However, the simultaneous charging on pollutants and filters did not improve the efficiency of 40 ppi PU-C filter. The reason may be that the specific resistance of 40 ppi PU-C filter was 6 times larger than that of 30 ppi PU-C filter, which leads to more negative ions accumulating on the filter surface. The tendency for the removal of DnBP is similar. The net ozone productions of all experiments were less than 0.38 mg/h. Overall, this study developed an ionizer-assisted filtration method with an external electrostatic field, which is based on inexpensive, low pressure drop coarse filters, and is efficient for the active control of gaseous PAEs.

邻苯二甲酸酯（PAE）已广泛用于室内应用，会引起严重的疾病。在这项研究中，我们开发了一种具有外部静电场的电离器辅助过滤方法，以有效去除气态DiBP（邻苯二甲酸二异丁酯）和DnBP（邻苯二甲酸二丁酯）。我们使用低压降聚氨酯（PU）泡沫作为基材过滤器，并将细小的活性炭粉末作为PU-C泡沫装入PU泡沫中。在1 m / s的表面速度下，新过滤器的压降范围为5.28 Pa至14.3 Pa。我们调查了过滤材料和静电荷对PAE单次过滤效率和净臭氧产生量的影响。对于DiBP，30 ppi（孔/英寸）过滤器的过滤效率从15.4％（PU）提高到29.3％（PU-C）。仅污染物预充电不能提高PAE的过滤效率。可能是因为负离子积聚在过滤器表面上，并在带电的气态PAE和过滤器之间引起静电排斥力，从而降低了静电过滤效率。当同时对-8.0 kV的污染物充电和对+10.0 kV的过滤器充电时，DiBP的30 ppi PU-C过滤器的过滤效率从29.3％提高到45.5％。但是，对污染物和过滤器同时充电并不能提高40 ppi PU-C过滤器的效率。原因可能是40 ppi PU-C过滤器的电阻率是30 ppi PU-C过滤器的电阻率的6倍，这导致更多的负离子积聚在过滤器表面。去除DnBP的趋势是相似的。所有实验的净臭氧产生量均小于0.38 mg / h。总体而言，本研究开发了一种具有外部静电场的电离器辅助过滤方法，该方法基于廉价的低压降粗滤器，可有效控制气态PAE。