高效光催化剂Ag/AgCl膜的制备及其在日光下降解甲基橙的研究

Preparation of Highly Efficient Photocatalyst Ag/AgCl Film and Study on Its Methyl Orange Degradation under Sunlight

[目的]探索高效光催化剂,介绍高效光催化剂Ag/AgC l膜的制备方法。[方法]以玻璃为载体,采用PVC固定的化学沉积法制备一种高效的且可充分利用太阳光的光催化剂Ag/AgC l膜,并对该膜表面形貌进行SEM表征,然后在太阳光光照条件下,以甲基橙为目标降解物,进行Ag/AgC l膜光催化氧化试验,研究了甲基橙色度、有机碳的去除率。[结果]研究制得的Ag/AgC l膜成膜均匀、疏松多孔,具有较高的比表面积,日光下该膜具有极高的光催化氧化活性,20 m in甲基橙溶液脱色率达到了94.4%,50 m in甲基橙的总有机碳去除率为34.4%;结合吸收曲线推测,甲基橙降解过程是偶氮键先断裂,后苯环打开,最终可完全降解为水和二氧化碳。[结论]该研究制备的Ag/AgC l膜具有很强的光催化性能。

[ Objective] The study aimed to explore the highly efficient photocatalyst and introduce the preparation method of Ag/AgCl film of highly efficient photocatalyst. [ Method] With glass as vector, a kind of Ag/AgCl film of photocatalyst that was highly efficient and could suffi- ciently utilize sunlight was prepared by using chemical deposition fixed by PVC, and the surface morphology of the film was SEM characterized, and then under the conditions of sunshine, the test of photo catalytic oxidation of Ag/AgCl film was carried out with methyl orange as target degradation product, the chroma of methyl orange and removal rate of organic carbon were studied. [ Result] The prepared Ag/AgCl film in the research was in even film forming, loose and porous, with higher specific surface area and had very high activity of photo catalytic oxidation under sunlight. The decoloration rate of methyl orange solution was up to 94.4% after 20min. , the removal rate of total organic carbon in methyl orange was 34.4% after 50 min. From conjecture on combination of absorption curve, the degradation course of methyl orange was that azo bond broke first, opened benzene ring later, and completely degraded into water and carbon dioxide ultimately. [ Conclusion] The Ag/AgCl film prepared in this research possessed strong photo catalytic performance.