Sericite powder (325 mesh) is fully washed several times with
deionized water to remove the moisture contained in the sericite and
dried for 24 h at 100 °C. 2 g of sericite powder pretreated with 200 mL
of MgCl2 ∙ 6H2O (1 M) in 250 mL of Erlenmeyer flask and then stirred
for 24 h at 250 rpm a using a horizontal shaker.