图1. (a)不同水热反应时间的固相部分产物的粉末XRD图谱;(b)固相和液相部分产物中Nb含量随水热时间的变化.虚线为伪一级动力学拟合曲线
Fig. 1. (a) Powder XRD patterns of solid product of different hydrothermal reaction time; (b) Nb content in solid product and solution as a function of hydrothermal time. The dashed line is the fitting curve of the pseudo-first-order kinetic