CdS/C_(60)C(COOH)_2复合材料的制备及可见光下对罗丹明B的光催化降解研究

Preparation and Photocatalytic-Degradation of Rhodamine B under Visible Light of CdS/C_(60)C(COOH)_2 Composites

采用简单的溶剂热反应获得片状CdS纳米材料,然后将其与不同量的富勒烯羧酸衍生物(C60C(COOH)2)进一步复合,从而制备了一系列C60C(COOH)2的质量分数范围为0.25%～1.25%的二元复合材料CdS/C60C(COOH)2。在对该复合材料进行表征之后,研究了其对可见光下罗丹明B(RhB)的催化降解效果,结果表明有利于光生电子和空穴分离的C60C(COOH)2可以有效提高单一半导体CdS纳米材料的吸附性和光催化活性,改善了可见光下RhB的降解速率。实验还表明,当C60C(COOH)2负载量为0.50%时,其光催化降解RhB的效率最高,并且采用CdS/C60C(COOH)2作为催化剂时,经过4次循环使用后,在可见光下对RhB的降解率仍可维持在80%以上,表明该复合材料能够有效改善自身光腐蚀现象。最后初步探讨了光催化反应的机理。

The CdS nanosheet was prepared by simple solvothermal method firstly,and a series of CdS/C60C(COOH)2 composites over the mass fraction range of 0.25% to 1.25% were fabricated by C60C(COOH)2combining with the flaky CdS nanomaterial.After being characterized by different techniques in detail,the CdS/C60C(COOH)2 composites were used as the catalysts for degradation of Rhodamine B(RhB)under visible light.Experiments results revealed that CdS/C60C(COOH)2 composites possessed higher absorption ability and photocatalytic activity due to efficient separation of photogenerated electron-hole pairs of C60 derivatives than sole CdS nanosheets.It was also found that CdS/C60C(COOH)2 nanocomposite with C60C(COOH)2(0.50%)exhibited the highest photocatalytic degradation efficiency of RhB.Moreover,after four cycles,the efficiency of this composite as a catalyst for RhB degradation was also above 80%,which indicated that the composites were relative stable and could avoid the self-photocorrosion.At last,the response mechanism was studied briefly.