【摘要】：甲醛廣泛存在于環(huán)境中，是室內(nèi)空氣主要污染物之一，長期接觸會對人體健康產(chǎn)生諸多不利的影響。因此，甲醛的去除是目前亟待解決的問題之一。近年來，光催化氧化技術(shù)以其反應速率快、反應徹底等優(yōu)點成為室內(nèi)空氣凈化的研究熱點。針對現(xiàn)有的研究，如何將光催化氧化技術(shù)更好的應用到實際中，實現(xiàn)光催化空氣凈化器的小型化、實用化、廉價化具有重要的理論與實踐意義。 本文首先根據(jù)光催化反應原理設計了一種結(jié)構(gòu)簡單的壁掛式光催化空氣凈化器并與廠家合作制作出一臺樣機，理論上可以提高光催化的反應速率；其次通過搭建實驗平臺、設計實驗方案、制備實驗材料，研究本實驗裝置對甲醛的降解效果，并與傳統(tǒng)的平板式反應器進行對比分析；然后通過選擇幾個可控的影響因素設計了正交實驗，并利用數(shù)理統(tǒng)計的知識對實驗結(jié)果進行直觀分析與方差分析，以確定本實驗裝置的最佳配比條件；最后在最佳配比條件下進行實驗，確定本實驗裝置的最理想凈化效果。主要研究成果如下： ①在相同的實驗條件下，將本裝置與傳統(tǒng)的平板式反應器對比分析，可得到本裝置較平板式反應器降解效果更好，降解效率提高了14%。 ②通過設計正交實驗可得，在實驗條件范圍內(nèi)自行設計的光催化空氣凈化器的最佳配比條件為：初始濃度為0.7mg/m3，環(huán)境溫度為25℃，P25TiO2的負載量為1.0mg/cm2。 ③通過方差分析可知，，在環(huán)境溫度、污染物初始濃度及負載量等幾個可控因素下，其各自對光催化空氣凈化器的影響存在顯著性差異，顯著性水平為：環(huán)境溫度＞甲醛初始濃度＞P25TiO2的負載量。 ④在最佳配比條件下的總衰減實驗中甲醛的降解效率在120min內(nèi)可達到89%，總衰減系數(shù)達到0.02，降解效果較好，將環(huán)境測試艙體積轉(zhuǎn)換為標準體積可得本裝置的凈化效能屬于C級范圍。
[Abstract]:Formaldehyde exists widely in the environment and is one of the main indoor air pollutants. Therefore, the removal of formaldehyde is one of the problems to be solved. In recent years, photocatalytic oxidation technology has become the research hotspot of indoor air purification due to its rapid reaction rate and thorough reaction. In view of the existing research, how to better apply photocatalytic oxidation technology to practice and realize the miniaturization, practicability and cheapness of photocatalytic air purifier has important theoretical and practical significance. In this paper, a simple wall photocatalytic air purifier is designed according to the principle of photocatalytic reaction, and a prototype is made in cooperation with the manufacturer, which can improve the reaction rate of photocatalysis theoretically. The experiment scheme was designed, the experimental material was prepared, the degradation effect of formaldehyde was studied, and compared with the traditional plate reactor, the orthogonal experiment was designed by selecting several controllable influencing factors. The experimental results are analyzed intuitively and the variance analysis is used to determine the optimum matching conditions of the experimental equipment. Finally, the optimal purification effect of the experimental device is determined by the experiments under the optimum proportioning conditions. The main research results are as follows: 1 under the same experimental conditions, compared with the traditional plate reactor, it can be concluded that the degradation effect of this device is better than that of the plate reactor, and the degradation efficiency is increased by 14%. 2 by designing orthogonal experiment, the optimum ratio of photocatalytic air purifier designed in the range of experimental conditions is as follows: the initial concentration is 0.7 mg / m ~ (3), the loading amount of P25TiO _ (2) is 1.0 mg / cm ~ (2) at 25 鈩

本文編號：2253169