室内空气净化器活性炭滤网酸臭异味特征及其来源解析

Characteristics and sources apportionment of sour odor in activated carbon filter of indoor air purifier

空气净化器在使用一段时间后会产生强烈的酸臭气味,严重影响消费者对产品的使用体验,为了考察酸臭异味的成因及来源,本研究首先采取感官等级评价得到存在酸臭异味的滤网样品特征,然后进一步通过气相色谱质谱、离子色谱等多种仪器手段从酸臭异味的角度对滤网样本进行剖析,结合感官等级评分进行相关性分析.结果表明,以乙酸为主的小分子有机酸可能是活性炭滤网酸臭异味的主要贡献者,根据文献调研推断很可能源于活性炭表面羧基基团脱落、常用催化剂的降解残留以及使用过程中的催化氧化.此外,低嗅阈值的微量化合物也可能是重要的气味贡献者之一.在实验研究的基础上,通过解析识别活性炭滤网潜在的气味来源和形成途径,以期为改善活性炭滤芯生产工艺与防治异味提供科学参考依据.

Air purifier will produce a strong sour odor after a period of use, which will seriously affect the use experience of consumers. In order to investigate the cause and source of the sour odor,this study first adopted sensory grade evaluation to obtain the characteristics of the filter samples with sour odor. Then, a variety of instruments such as gas chromatography-mass spectrometry and ion chromatography were further used to analyze the filter samples from the perspective of sour odor,and the correlation analysis was carried out by combining sensory grade scores. Results showed that small molecular organic acids, mainly acetic acid, may be the main contributors to the odor of activated carbon filter. According to the literature investigation, it can be inferred that the source is probably from the removal of the surface carboxyl group of activated carbon, the degradation of commonly used catalysts and the catalytic oxidation in the process of use. In addition, trace compounds with a low olfactory threshold may also be one of the important odor contributors. On the basis of the experimental study, the potential odor sources and formation pathways of activated carbon filter were identified, in order to provide scientific reference for improving the production process of activated carbon filter and preventing and controlling odor.