利用炭吸附水热法制备GdFeO₃的钙钛矿型晶体纳米粉体,利用热重分析仪(TG-DTA)、X射线衍射仪(XRD)、紫外-可见分光光度计(UV-Vis)、比表面与孔径分析仪(BET)以及气相色谱仪(GC)分析晶体的热稳定性、晶相纯度、吸光性能及比表面积,通过甲基橙在可见光辐射下限定时间的降解程度来评价GdFeO₃粉体的光催化性能。结果表明,炭吸附水热法制得的GdFeO₃粉体有高的结晶度、热稳定性以及更大的比表面积,炭黑的加入有效阻止了粉体在制备、干燥及焙烧过程中的团聚和烧结,炭吸附水热法制备的GdFeO₃粉体可吸收的光波长范围更大、吸光性能更好。光催化实验结果表明,炭吸附水热法制得的GdFeO₃粉体性质稳定,光辐射140 min时甲基橙的降解率达82%。

Perovskite type crystalline GdFeO₃ nano-powder is prepared via carbon adsorption-hydrothermal method,and its thermal stability,crystalline phase purity,light absorption property and specific surface area are analyzed by means of thermogravimetric analyzer (TG-DTA),X-ray diffractometer (XRD),UV-Vis spectrophotometer (UV-Vis),and specific surface and pore size analyzer (BET) as well as gas chromatography (GC).The photocatalytic properties of GdFeO₃ powders are evaluated by the degradation of methyl orange under visible light radiation for a limited time.Experiment results show that GdFeO₃ powder prepared by carbon adsorption-hydrothermal method shows high crystallinity,good thermal stability and larger specific surface area.The addition of carbon black prevents the powder effectively from agglomeration and sintering during the preparation,drying and roasting processes,which makes the powder absorb more light in the wavelength range and have better light absorption performance.The results from photocatalytic experiments show that GdFeO₃ powder prepared by carbon adsorption-hydrothermal method has a stable property,over which the degradation rate of methyl orange reaches 82% in 140 min of light radiation.

黄擘(1994-),男,硕士研究生,研究方向为光催化降解,2690177628@qq.com