本文报道利用自旋捕获技术对醇水溶液在Rh_2O_3/CdS上可见光催化脱氢反应机理的研究结果。实验表明:以PBN或4-POBN作为捕获剂,只有当体系中含有催化剂并同时进行光照时,才能出现相应的自旋加成物PBN-OH或4-POBN-OH的ESR谱线,说明在醇水溶液的可见光催化脱氢反应中确有OH自由基生成,其生成速度与产H_2速度有着对应的关系,这就从实验上表明水的分解十分可能是这一反应的中介步骤。 This paper reports the results of a study on the mechanism of visible light photocatalytic dehydrogenation of alcohol aqueous solution onto Rh_2O_3 / CdS by spin-trapping technique. Experiments show that: PBN or 4-POBN as a capture agent, only when the system contains a catalyst and at the same time when the light of the corresponding spin adduct PBN-OH or 4-POBN-OH ESR spectrum shows that in The alcoholic aqueous solution of visible light photocatalytic dehydrogenation does have OH radical, the rate of its production and H 2 production rate has a corresponding relationship, which shows that the decomposition of water from the experiment is likely to be the intermediate step of this reaction.