Stevens Lisa, Lanning John A, Anderson Larry G, Jacoby William A, Chornet Nicholas
a Department of Chemistry and Center for Environmental Science , University of Colorado at Denver , Denver , Colorado , USA.
b National Renewable Energy Laboratory , Golden , Colorado , USA.
J Air Waste Manag Assoc. 1998 Oct;48(10):979-984. doi: 10.1080/10473289.1998.10463748.
Though the bulk of research involving photocatalytic oxidation (PCO) of volatile organic compounds (VOCs) has involved the remediation of pollutants at high inlet concentrations, there has been some implication that PCO can be used to reduce exposure to low concentrations of VOCs and improve the quality of indoor air. The high conversion rates previously reported for PCO of VOCs in the parts-per-million (ppm) range may not, however, be applicable to concentrations in the parts-per-billion (ppb) range that are more typical of indoor air quality (IAQ) issues. This paper reports on an examination of the operational characteristics of four PCO reactor designs used for the oxidation of VOCs in the ppb concentration range. Reactor efficiency is examined for three low molecular weight carbonyl compounds commonly associated with IAQ issues: formaldehyde, acetaldehyde, and acetone. The measured response is the destruction of carbonyl reac-tants. Variables include flow stream velocity and reactor residence time. Oxidation of carbonyl compounds is also examined as a function of ultraviolet (UV) radiation intensity. PCO of the formaldehyde and acetone was nearly 100% for all reactor designs. To assist comparison of the reactor designs, oxidation efficiency of trichloroethylene (TCE) was evaluated at inlet concentration in the parts-per-million by volume (ppmv) range.
尽管大部分涉及挥发性有机化合物（VOCs）光催化氧化（PCO）的研究都围绕在高入口浓度下对污染物的修复展开，但已有一些迹象表明，PCO可用于减少低浓度VOCs的暴露并改善室内空气质量。然而，先前报道的百万分之一（ppm）范围内VOCs的PCO高转化率可能并不适用于十亿分之一（ppb）浓度范围，而该浓度范围更能代表室内空气质量（IAQ）问题。本文报告了对四种用于氧化ppb浓度范围内VOCs的PCO反应器设计的运行特性的研究。针对三种通常与IAQ问题相关的低分子量羰基化合物：甲醛、乙醛和丙酮，考察了反应器效率。测量的响应是羰基反应物的破坏。变量包括气流速度和反应器停留时间。还考察了羰基化合物氧化与紫外线（UV）辐射强度的关系。对于所有反应器设计，甲醛和丙酮的PCO几乎达到100%。为便于比较反应器设计，在体积百万分之一（ppmv）范围内的入口浓度下评估了三氯乙烯（TCE）的氧化效率。
