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用电子自旋共振（ＥＳＲ） 方法，研究（ 稀土元素，银）／ＴｉＯ２ 纳米光催化材料（Ｍ／ＴｉＯ２） 在紫外光照射前后羟基自由基（·ＯＨ） 信号强度的变化规律． 结果表明：在Ａｇ／ＴｉＯ２ 系材料中加入稀土元素后，不论紫外光照射与否，羟基自由基信号均增强，光催化活性增加；材料（Ｍ／ＴｉＯ２） 经８００ ℃热处理后，羟基自由基信号减弱，光催化活性降低．
The electron-spin resonance (ESR) method was used to study the change of signal intensity of hydroxyl radical (· OH) before and after ultraviolet irradiation on (RE / Ag) / TiO2 nanomaterials. The results showed that the signal of hydroxyl radicals increased and the photocatalytic activity increased with the addition of rare earth elements to Ag / TiO2. The signal of hydroxyl radical Weakened, photocatalytic activity decreased.