After cooling to room temperature, the pH value of the synthesis gel was adjusted up to 7.5 by adding ammonia dropwise at room temperature, under stirring. pH was continuously monitored with pHS-3C pH-meter from Shanghai Yulong instruments.
After cooling to room temperature, the pH value of the synthesis gel was adjusted up to 7.5 by adding ammoniadropwise at room temperature, under stirring. pH was continuously monitored with pHS-3C pH-meter from Shanghai Yulonginstruments.