浸渍改性活性碳纤维吸附氮氧化物性能

为实现新风在通过空调进入室内前已被优化的目的, 搭建了一套开式循环系统。通过对活性碳纤维进行浸渍改性, 采用比表面测定、SEM观察、XPS分析、傅里叶变换红外谱图分析对改性前后活性碳纤维进行了表征; 定量研究了室外氮氧化物初始浓度、温度和风速等环境因素对改性前后活性碳纤维吸附氮氧化物效率的影响。结果表明, 改性对活性碳纤维表面活性官能团种类、含氧官能团数量、表面微观结构及比表面积等特性均有显著影响, 提高了其对氮氧化物的吸附效率; 室外初始浓度、风速、温度对改性前后活性碳纤维吸附氮氧化物效率的变化趋势基本一致; 改性前后活性碳纤维对氮氧化物的吸附率随初始浓度的升高而逐渐降低, 随过滤器处风速增大先升高后降低, 随过滤器处温度的升高先升高后降低。改性后活性碳纤维对空气中氮氧化物的吸附率明显提高, 可以将其应用于空调系统中。

NOx adsorptive performance by impregnated activated carbon fibers

In order to realize the optimization of fresh air before it enters the room through the air conditioning, an open circulation system was set up. Modified activated carbon fibers were prepared by impregnation method, and BET, SEM, XPS and FT-IR were used to characterize the pristine and modified fibers. The effects of outdoor initial NOx concentration, wind speed and temperature at the core filter on NOx adsorption effect were quantitatively studied. The results show that the modification had significant effects on the surface functional group, the number of oxygen-containing functional groups, the surface microstructure and specific surface area of the activated carbon fibers, and improves its removal efficiency of NOx. The initial NOx concentration, wind speed and temperature presented the same effect trend in NOx adsorption efficiency on activated carbon fibers before and after modification. NOx removal rate by pristine and impregnated activated carbon fiber decreased with the increase of initial NOx concentration, and increased first and then decreased with the increase of wind speed or temperature at the filter. The maximum NOx removal rate by modified activated carbon fiber was 60%. Thus it can be applied to an air conditioning system.