图3 钠基蒙脱石a和医药级蒙脱石钠化改性后b制备头孢拉定蒙脱石插层化合物的XRD图谱 Fig. 3 XRD patterns of cefradineNa-MMT and compounds prepared by pharmaceutical MMT in NaCl solution a Mass ratios of MMT to cefradine are 1:0.5, 1:2, 1:3, 1:4, respectively; b Mass ratios of MMT to cefradine are 1:1, 1:4, respectively |