Department of Organic Technology, Institute of Chemical Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
Chemosphere. 2010 Oct;81(5):617-25. doi: 10.1016/j.chemosphere.2010.07.052. Epub 2010 Sep 15.
Vapor phase hydrogen peroxide (VPHP) nowadays finds more and more applications especially as a bio-decontamination agent for enclosed areas. Although this oxidizing agent logically offers a potential for the degradation of hazardous chemical contaminants, the information on the utilization within this area is very limited. The main objective of this study was to examine in detail the influence of basic operational (temperature, concentration of VPHP, relative humidity, condensation) and other conditions (e.g. amount of contaminant, the effect of UV radiation) on the efficiency of the VPHP process for the degradation of the selected model substance, i.e. 4-(dimethylamino)benzaldehyde. For this purpose, a series of different VPHP "wet" decontamination cycles (with a visible condensation) were carried out and compared. The obtained results clearly proved that VPHP could be utilized for the degradation of 4-(dimethylamino)benzaldehyde, however it was necessary to regard this process as a multi-parametric, in which all operational conditions played significant roles, while the molecular distribution of H(2)O and H(2)O(2) at first constituted the key factor for a successful degradation of contaminants on the surface. In order to achieve the highest decomposition efficiency of 4-(dimethylamino)benzaldehyde by the wet VPHP process, it appeared to be necessary to decrease the initial relative humidity in the relevant enclosed area (ideally up to 5%) before the introduction of VPHP and carry out this decontamination procedure ideally at 25°C and maintain the VPHP concentration higher than 500 ppm. Furthermore, it was found that the addition of UV radiation had a positive role on VPHP efficiency (in the best case, the degradation rate increased up to 1.5 times compared to using the sole VPHP). The monitoring of the concentration of VPHP within an enclosed facility is a good tool for the monitoring of the degradation of chemical contaminants by this agent.
目前，气相过氧化氢（VPHP）作为一种用于封闭区域的生物去污剂，应用越来越广泛。尽管这种氧化剂在理论上提供了降解危险化学污染物的潜力，但关于该领域的利用信息非常有限。本研究的主要目的是详细研究基本操作（温度、VPHP 浓度、相对湿度、冷凝）和其他条件（例如污染物的数量、UV 辐射的影响）对 VPHP 工艺降解选定模型物质的效率的影响，即 4-（二甲基氨基）苯甲醛。为此，进行了一系列不同的 VPHP“湿”去污循环（可见冷凝），并进行了比较。所得结果清楚地证明，VPHP 可用于降解 4-（二甲基氨基）苯甲醛，但有必要将该过程视为多参数过程，其中所有操作条件都起着重要作用，而 H(2)O 和 H(2)O(2)的分子分布最初是表面污染物成功降解的关键因素。为了通过湿 VPHP 工艺实现 4-（二甲基氨基）苯甲醛的最高分解效率，似乎有必要在引入 VPHP 之前降低相关封闭区域中的初始相对湿度（理想情况下降至 5%），并在理想条件下于 25°C 进行去污程序，并保持 VPHP 浓度高于 500 ppm。此外，发现添加 UV 辐射对 VPHP 效率有积极作用（在最佳情况下，与单独使用 VPHP 相比，降解速率提高了 1.5 倍）。在封闭设施内监测 VPHP 的浓度是监测该试剂降解化学污染物的有效工具。
