Modeling of by-products from photocatalytic oxidation (PCO) indoor air purifiers: A case study of ethanol
Modeling of by-products from photocatalytic oxidation (PCO) indoor air purifiers: A case study of ethanol
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DOI：
10.1016/j.buildenv.2018.08.048
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发表时间：
2018-10-15
影响因子：
7.4
通讯作者：
Haghighat, Fariborz
中科院分区：
文献类型：
--
作者：
Zhong, Lexuan;Haghighat, Fariborz
近二十年来，紫外光催化氧化(UV PCO)技术在室内空气净化方面受到了广泛的关注。然而，UV-PCO过程中副产物的形成使其提供健康室内空气质量(IAQ)的前景变得黯淡。这项研究考察了36个UV-PCO测试中的副产品生成和操作参数，这些测试使用的是一个试点管道系统，目的是开发可靠的副产品预测模型。统计分析的目的是建立线性和非线性回归模型，根据浓度、相对湿度、气流和辐照度等因素预测甲醛和乙醛的浓度。建立的线性模型对乙醛和甲醛和乙醛的总和(FA)水平提供了令人满意的估计，回归系数(R-2)分别为0.74和0.84。参数研究和双变量分析进一步证实了自变量对乙醛和甲醛产量的统计意义。提出了PCO反应途径，解释了表面强键合中间体的存在降低了乙醛进一步氧化为甲醛的反应活性。
Ultra -violet photocatalytic oxidation (UV PCO) technology has been receiving extensive attention for indoor air purification in recent two decades. However, the formation of by-products during the UV-PCO process darken its prospect of providing healthy indoor air quality (IAQ). This study examines by-product generation and operational parameters from 36 UV-PCO tests using a pilot duct system with the objectives of developing reliable byproduct predictive models. The statistical analysis aimed at establishing linear and non-linear regression models to predict the concentrations of formaldehyde and acetaldehyde based on factors such as concentration, RH, airflow, and irradiance. The developed linear models provided satisfactory estimations of acetaldehyde and the sum of formaldehyde and acetaldehyde (FA) levels with regression coefficients (R-2) of 0.74 and 0.84, respectively. Parametric study and bivariate analysis further confirm the statistical significance of independent variables on the acetaldehyde and FA productions. The PCO reaction pathway was proposed to explain that the presence of some strongly bounded intermediates on the surface decreased the reactivity of acetaldehyde to be further oxidized to formaldehyde.