文物保存微环境空气氮氧化物集成净化技术研究

Integrate removal of NOx from the micro-environment in the conservation of cultural relics

为研究文物保存微环境中的集成净化技术,联合采用光催化预处理和竹炭吸附技术净化低浓度的氮氧化物。研究了组合方式在不同光源下的净化效果,同时探讨了湿度对低浓度氮氧化物净化效果的影响。结果表明:在采用恰当的组合情况下,紫外线照射和可见光照射下,净化结果相差不大,最佳组合为光催化+竹炭+4A分子筛+竹炭的组合,NO和NO_2的出口浓度分别可降至1.98μg/m^3和1.80μg/m^3;而相对湿度增加,处理效果降低,但在相对湿度为60%情况下,仍可较长时间内稳定运行,保持出口NOx在4ng/g以下。综合实验结果,光催化联合竹炭吸附集成技术净化低浓度的氮氧化物效果良好,为今后文物保存微环境中的实际应用提供科学依据。

The bamboo charcoal adsorption,combined with photocatalytic pre-treatment,was utilized to remove low - concentration nitrogen oxides(NOx) from the cultural relics conservation micro - environment used to conserve and protect cultural relics.The efficiency of NOx removal under different conditions was studied with various lamp source and levels of relative humidity.These studies indicated that there are no distinct difference between UV illumination and solar light illumination.The optimal sequence for air purification is photocatalysis followed by bamboo charcoal,type 4A molecular sieve,and bamboo charcoal absorption.The outlet concentration of NO and NO_2 were 1.98μg/m^3 and 1.80μg/m^3 respectively.With an increase of relative humidity,the NOx removal rate decreased; however,the combined purifier can work reliably for longer periods and keep outlet NOx concentrations below 4×10^(-9).In conclusion,bamboo charcoal adsorption,combined with photocatalytic has excellent performance and should be widely employed as a protective technology in the micro - environment conservation.