太阳能光热转换材料——硫化铅/凹凸棒石

Lead sulphide/attapulgite material for solar energy photothermal conversion

利用磷酸改性凹凸棒石吸附溶液中的铅离子，再与硫化钠反应后制得硫化铅／IN凸棒石复合材料。试验显示：60mg／L的含铅离子溶液中制备的硫化铅／凹凸棒石复合材料在模拟太阳光照射下30min．温度提高约6℃，其光热转换能力强于体相PbS；对波长300～2500nm的太阳光有比体相PbS更高的吸收率；复合材料中的PbS比体相PbS的电子跃迁能带更宽；材料密度远低于体相PbS，可以在同等厚度下覆盖更大的面积。

In this work, lead sulphide/attapulgite composite material was synthesized through two steps. Firstly, attapulgite, which was treated by phosphoric acid in advanced, absorbed lead ions from the solution to get the lead ions/attapulgite material. Then, the prepared lead ions/attapulgite material reacted with sodium sulfide in order to get the lead sulphide/attapulgite composite material. From the experimental results, it was found that the temperature of the lead sulphide/attapulgite composite material prepared from the solution containing 60 mg/L lead ions was able to raise about six Celsius degrees under the simulated sunlight for thirty minutes, and the composite material was stronger than bulk phase lead sulphide on converting more light energy into the heat. It was also showed that the lead sulphide/attapulgite composite material had higher light absorptivity at the range of wavelength from 300 nm to 2 500 nm, and had wider band of electron transition than the bulk phase lead sulphide. Moreover, the density of the lead sulphide/attapulgite composite material is far lower than that of the bulk phase lead sulphide, which indicates that the composite material is able to cover bigger area than the bulk phase lead sulphide under the same depth.