石墨相氮化碳/蒙脱石复合材料的制备及其可见光催化性能

为提高石墨相氮化碳(g-C₃N₄)对可见光的利用率及光催化效率，采用热聚合与直接负载等方法，将g-C₃N₄负载于蒙脱石表面，制备了g-C₃N₄/蒙脱石复合光催化材料，其结构经SEM, FT-IR及XRD表征。以罗丹明B(RhB)为目标污染物，研究了不同负载量g-C₃N₄/蒙脱石复合光催化剂的可见光催化性能。并分别以对苯醌、碘化钾和异丙醇为自由基捕获剂，研究了复合材料的光催化机理。结果表明：当g-C₃N₄的质量分数为83%(CN/M-83%)时，RhB经可见光照射1 h后，降解率达到99.2%。光催化速率常数为纯g-C₃N₄光催化速率常数的3.2倍。

Preparation and Visible Photocatalytic Properties of g-C3 N4/Montmorillonite Composites

In order to improve the utilization of visible light and photocatalytic efficiency of graphite carbon nitride(g-C3N4), g-C3N4/montmorillonite composite photocatalytic material was prepared by thermal polymerization and direct loading method. The structure was characterized by SEM, FT-IR and XRD. The photocatalytic activity of g-C3N4/montmorillonite composite photocatalysts with different loadings was studied. The photocatalytic mechanism of the composite was studied by using p-benzoquinone, potassium iodide and isopropanol as free radical traps, respectively. The results showed that when g-C3N4 accounts was 83%(CN/M-83%), the degradation rate of RHB was 99.2% after exposing to visible light for 1 h, and the photocatalytic rate constant was 3.2 times of pure g-C3N4.