Then 30 mL deionized and 2mL ammonia water was added into the mixed suspensions under vigorous stirring for 1 h at 70 °C water bath to adjust its pH value at 8.5.
Then 30 mL deionized and 2mL ammonia water was added into the mixed suspensions under vigorous stirring for 1 h at 70 °C water bath to adjust its pH value at 8.5.