提出了一种以2-羟基对苯二甲酸为荧光探针快速评价光自洁材料自洁能力的新方法.通过与香豆素法和2,2′-联吡啶法进行对比,发现该法具有更高的灵敏度和更宽的pH适用范围;在优化的实验条件下,用此法评价几种实际光自洁材料的光催化活性,并和传统的甲基橙法进行比较,所得结果一致,但此法检测时间只需30 min,同时灵敏度提高了7 500倍. A new method to evaluate the self-cleaning ability of self-cleansing materials with 2-hydroxyterephthalic acid as fluorescent probe is proposed. By comparing with coumarin method and 2,2’-dipyridyl method, It has higher sensitivity and broader pH range. Under the optimal experimental conditions, the photocatalytic activity of several self-cleaning materials was evaluated by this method and compared with the traditional methyl orange method. The results were consistent , But the method of detection time only 30 min, while the sensitivity increased by 7 500 times.