壳聚糖-TiO_2吸附剂对银的吸附及纳米银的生成

Adsorption of chitasan-TiO_2 adsorbent(CTA) on Ag and formation of nano Ag on CTA

将生物选择性吸附和光催化技术耦合合成一种新型的多功能壳聚糖-二氧化钛吸附剂(CTA),这种新型的多功能壳聚糖-二氧化钛吸附剂能够同时吸附重金属和降解有机污染物。实验发现,CTA对银离子有较好的吸附容量,在初始浓度为1 000 mg/L时吸附容量为100.3 mg/g,且吸附了银离子的吸附剂对甲基橙有更好的降解效果。扫描电镜表明,CTA紫外条件下吸附银以后表面会有纳米银的生成,能谱显示纳米银颗粒在一定条件下可以由CTA表面自行脱落。

The technology of biosorption and photocatalysis were coupled to synthesize a double functional chitosan-TiO2 adsorbent（CTA）.The CTA can degrade organic pollutants and adsorb heavy metal ions simultaneously.It was found that CTA had a good adsorbility for Ag,and the adsorbility for Ag was 100.3 mg/g when the concentration of Ag was 1 000 mg/L.The CTA loaded Ag had better degradation ability for Methyl Orange than free CTA.Scanning electron microscopy and energy spectrum showed that there was the production of nano Ag and it could drop off from the CTA itself.