Fe^(3+)掺杂的AgInS_(2)的制备及其可见光催化活性研究

Study on Preparation and Visible Light Photocatalytic Activity of Fe^(3+) Doped A_(g)I_(n)S_(2)

目的:探讨Fe^(3+)的掺杂对AgInS2的结构、形貌和可见光催化活性的影响。方法:采用原位液相法制备不同Fe^(3+)掺杂量的AgInS2(表示为AgInS_(2),通过降解罗丹明B(RhB)和对硝基苯酚(PNP),考察Fe^(3+)的掺杂对AgInS2可见光催化活性的影响。结果:Fe^(3+):In^(3+)=2.8:14.2时,AgInS_(2)对RhB的降解具有最高的可见光催化活性;4个样品中,Fe^(3+):In^(3+)=12:5的AgInS_(2)对PNP的降解具有最高的可见光催化活性。结论:Fe^(3+)的掺杂未改变AgInS2的结构和形貌,但可调节其颗粒大小和结晶度,增强AgInS2在450~600 nm范围的吸收,抑制光生电子(e-)和光生空穴(h+)的复合,从而提高AgInS2的可见光催化活性。

Objective:To study the effects of Fe^(3+)doping on the structure,morphology and visible light photocatalytic activity of AgInS2.Methods:AgInS2 doped with different amount of Fe^(3+)(denoted as AgInS_(2))were prepared by in-situ liquid phase method.Rhodamine B(RhB)and p-nitrophenol(PNP)were used as the degradation substrates for studying the visible light photocatalytic activity of AgInS_(2).Results:When Fe^(3+):In3+=2.8:14.2,AgInS_(2) has the highest visible light catalytic activity for the degradation of RhB;among the four samples,AgInS_(2) with Fe^(3+):In3+=12:5 has the highest visible light catalytic activity for the degradation of PNP.Conclusion:The doping of Fe^(3+)into AgInS2 did not change the structure and morphology of AgInS2,but it could adjust the particle size and crystallinity,enhance the absorption of AgInS2 in the range of 450-600 nm,and inhibit the recombination of photogenerated electrons(e-)and photogenerated holes(h+),thus improving the visible light photocatalytic activity of AgInS2.