CdS/rGO复合气凝胶的自组装合成及光催化降解盐酸四环素性能

Self-assembly synthesis of CdS/rGO composite aerogels and its photocatalytic degradation of tetracycline hydrochloride

以L-赖氨酸为还原剂和交联剂,采用一步水热法制备嵌入CdS纳米薄片(CdS NSs)的三维CdS/还原氧化石墨烯(CdS/rGO)复合气凝胶。结果表明:CdS/rGO复合气凝胶大的比表面积BET(Brunauer-Emmett-Teller,BET)和海绵状性质可增强对污染物的吸附,且其质量轻可漂浮在水面上可增强对光的吸收,同时rGO的引入促进了光生电荷的分离,使该复合气凝胶的光催化性能得到明显提升。在可见光照射下,CdS/rGO复合气凝胶可以在45 min内将盐酸四环素(tetracycline hydrochloride,TC)完全降解,1.5 h后几乎所有TC都已经矿化。此外,CdS/rGO复合气凝胶还显示出高稳定性并且容易从反应体系中分离出来,进行回收循环使用。经过5次循环使用后,CdS/rGO复合气凝胶的光催化活性没有明显降低。

A CdS/reduced graphene oxide(rGO) composite aerogel with CdS nanosheets(CdS NSs) grown on an interconnected three-dimensional rGO-based porous network was prepared by one-pot hydrothermal method using L-lysine as a reducing agent and the cross-linker. The results show that its enhanced adsorption toward pollutants owing to its large Brunauer-Emmett-Teller specific surface area and spongy nature, and improved light absorption due to its extremely light weight nature. Moreover, the rGO promotes the photogenerated charge separation. Thus, the CdS/rGO composite aerogel exhibits enhanced activity for photocatalytic degradation. It can be observed that the tetracycline hydrochloride(TC) has been degraded totally after 45 min by irradiated CdS/rGO composite aerogel, and almost all TC has been mineralized after 1. 5 h. Moreover, the CdS/rGO composite aerogel also shows high stability and can be easily separated from the reaction systems for recycling. The photocatalytic reduction activity of CdS/rGO composite aerogel shows no obvious decrease after 5 cycles.