Fig. 2From: Hydrothermal synthesis of zeolites from residual waste generated via indirect carbonation of coal fly ashFE-SEM images of raw materials and synthesized zeolites: a CFA, b RW-HCl, c RW-NH4Cl, d ZE-CFA-100, e ZE-HCl-100, f ZE-NH4Cl-100, g ZE-CFA-180, h ZE-HCl-180, and i ZE-NH4Cl-180Back to article page