Fig. 1From: Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave SynthesisThe N2 adsorption–desorption isotherms of the samples with different reaction times, A 40 min and B 60 min: a a-MCM-41, b o-MCM-41, c h-MCM-41, and d c-MCM-41. The isotherms shown in b, c, and d are offset by 100, 200, and 300 cm3/g, respectivelyBack to article page