2.1.1 LDH synthesized in T-Mixer with ultrasonic process

Salt solution A (100 mL) containing a mixture of 0.03 mol L<sup>1</sup> Mg(NO3)2 and 0.01 mol L<sup>1</sup> Al(NO3)3 and solution B-NH3H2O (100 mL) with certain concentration was simultaneously transported into a 'T-type' impinging-stream reactor by means of metering pumps at the rate of 100 r min<sup>1</sup> to produce MgAl LDHs. Ultrasonic processing was also applied during this process and the frequency of ultrasonic processing kept to be 20 kHz. The pH of the whole solution was always kept to be 10 0.2 though regulating the concentration of NH3H2O. The resulting mixture washed with water for several times until pH = 7 and then dried at 100°C in an oven. The resulting material was denoted as TU-LDHs.
