Three-dimensional excitation emission matrix fluorescence spectroscopy (3D-EEMs) was applied to analyze the variation characteristics of dissolved organic matter (DOM) six fractions in landfill leachate during photocatalytic degradation. The results showed that fluorescence spectroscopy of hydrophobic acids (HOA), hydrophobic bases (HOB), hydrophobic neutral traction (HIB), hydrophobic neutral fraction (HON) and hydrophilic neutral fraction (HIN) changed considerably, and that of HIA was relatively steady during photocatalytic process. In general, fluorescence peaks of humic acids-like had the most significant change during photocatalytic treatment process, and disappeared entirely after 60 h treatment, which implied that humic acids-like can be degraded preferentially. In 72 h effluent, VIS fulvic-like, tryptophan-like and tyrosine-like were residual in the fluorescence regions, and the last two were predominant fractions. These results indicated that macromolecular fulvic-like and humic acids-like can be degraded into micro-molecular protein-like matters.%采用三维荧光光谱分析技术研究了垃圾渗滤液DOM不同组分的光催化转化特征.结果表明,憎水性碱(HOB)、憎水中性(HON)、憎水性酸(HOA)、亲水性酸(HIA)、亲水性碱(HIB)和亲水中性(HIN)组分在光催化处理过程中荧光光谱发生显著变化,HIA组分相对稳定.各组分中代表类腐殖酸区域的荧光信号在处理过程中变化最大,处理60 h后,该区域荧光峰完全消失,说明类腐殖酸类物质能优先发生光催化降解.在72 h光催化处理液中,主要残留可见区富里酸、类色氨酸和类酪氨酸的荧光信号,其中代表类蛋白的类色氨酸和类酪氨酸类物质占主要部分,说明光催化氧化能将大分子的腐殖酸和富里酸降解为小分子的类蛋白物质.
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