TiO2納米管/UV/O3對腐殖酸的降解及應用基礎

摘要：用自制的二氧化鈦納米管(TNTs)作為催化劑,對腐殖酸進行TNTs/UV/O3工藝降解研究,優化了工藝參數,對相應的應用基礎進行了研究.結果表明,在最佳工藝條件下,本工藝對總有機碳(TOC)去除率高達80.12%,顯示了很好的降解能力.投加叔丁醇的實驗得出TNTs/UV/O3對腐殖酸的降解遵循羥基自由基理論.從無機碳(IC)的角度分析得出,高pH值易于CO2溶解,從而使原水IC值增大,有助于反應過程中IC值的積累,無機碳多以CO32-及HCO3存在,對·OH有很強的抑制作用.隨著反應時間的推移,催化劑污染越來越嚴重,一定階段后污染率達到最大值,隨后污染情況得到改善.TNTs對TiO2/UV/O3工藝具有很好的催化性能.Abstract：In this paper, degradation of humic acid was studied by the combined technical of photocatalysis and ozonation which was catalyzed by TiO2 nanotubes (TNTs). The technological parameters were optimized and the applied bases concerned were studied. The result shows that the rate of TOC removal of humic acid by TNTs/UV/O3 reaches 80.12% under the optimal condition. It proves that radical reaction played the main role in humic acid degradation by TNTs/UV/O3. The mechanism of pH value on this technic was analyzed by inorganic carbon (IC). At high pH value,CO2 was easily dissolved so that the value of original IC was increased, which easily accumulated IC in the reaction. The IC mainly existed in CO32-and HCO3-,which had obvious inhibition to·OH.The pollution of catalyst was increased with time extending in the reaction. After a period of time, its pollution rate would reach the maximum. Then, its pollution would be improved. The study shows that TNTs are good catalysis for TiO2/UV/O3. 作者： 潘留明[1]季民[2]王秀朵[3]趙樂軍[3]陸彬[2] Author： PAN Liu-ming[1]  JI Min[2]  WANG Xiu-duo[3]  ZHAO Le-jun[3]  LU Bin[2] 作者單位： 天津大學環境科學與工程學院,天津,300072;天津市市政工程設計研究院,天津,300051天津大學環境科學與工程學院,天津,300072天津市市政工程設計研究院,天津,300051 期 刊： 天津大學學報   ISTICEIPKU Journal： JOURNAL OF TIANJIN UNIVERSITY 年，卷(期)： 2010, 43(4) 分類號： X703.1 關鍵詞： TiO2納米管    腐殖酸    光催化    臭氧化    污染率    Keywords： titanium dioxide nanotubes    humic acid    photocatalysis    ozonation    pollution rate    機標分類號： O4 X5 機標關鍵詞： TiO2    二氧化鈦納米管    腐殖酸    降解研究    應用基礎    Treated    Humic Acid    humic acid    technological parameters    最佳工藝條件    radical reaction    pH value    inorganic carbon    無機碳    污染情況    催化劑    pollution of    羥基自由基    would    總有機碳 基金項目： 天津市科技發展汁劃資助項目

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