CAJ | 학술논문

采用高温热剥离和溶剂热过程分别还原氧化石墨和氧化石墨制备出石墨烯，进一步使用所合成的石墨烯与P25通过一步水热过程合成出石墨烯/P25复合材料。样品的光催化活性通过可见光下降解罗丹明B进行评测，其中P25和热剥离还原得到的石墨烯复合比P25和溶剂热还原的石墨烯复合显示出更优异的光催化活性，这是由于热剥离还原的石墨烯具有更高的还原度和更强的电子—空穴分离效率所致。进一步在不同温度下通过热剥离法制备了还原石墨烯，探讨的石墨烯/P25复合材料的光催化活性。较高的剥离温度有利于石墨烯还原程度的改善，导致光催化活性的提高。
채용고온열박리화용제열과정분별환원양화석묵화양화석묵제비출석묵희，진일보사용소합성적석묵희여P25통과일보수열과정합성출석묵희/P25복합재료。양품적광최화활성통과가견광하강해라단명B진행평측，기중P25화열박리환원득도적석묵희복합비P25화용제열환원적석묵희복합현시출경우이적광최화활성，저시유우열박리환원적석묵희구유경고적환원도화경강적전자—공혈분리효솔소치。진일보재불동온도하통과열박리법제비료환원석묵희，탐토적석묵희/P25복합재료적광최화활성。교고적박리온도유리우석묵희환원정도적개선，도치광최화활성적제고。
Two kinds of graphene prepared by a high-temperature exfoliation and a solvothermal method were used as supports of a TiO2 catalyst (P25) from Degussa, Inc to prepare TiO2/graphene composites. The photocatalytic activities of the composites were evaluated by their degradation of Rhodamine B in aqueous solutions under visible light. Results indicate that the composites prepared by high-temperature exfoliation have much higher photocatalytic activities than those produced by the solvothermal method or the un-supported P25. Both the adsorption capacity of Rhodamine B on the composites and their light absorption characteristics are inde-pendent of the kind of graphene used. The activity increases with exfoliation temperature and reduction degree of the graphene re-gardless of the methods and conditions used, indicating that a high degree of reduction of graphene can inhibit the recombination of electron-hole pairs generated by light irradiation by increasing electron transfer from TiO2 to the graphene layer.