Aspartic Acid- and Glycine-Functionalized Mesoporous Silica as an Effective Adsorbent to Remove Methylene Blue from Contaminated Water

Table 2

The maximum adsorption capacities of different adsorbents for removing MB from aqueous solution, reported in the past literatures.

Adsorbents	(mg·g^-1)	Ref
Amine functionalized mesoporous silica	49	[37]
Mesoporous silica with cyclodextrin	60	[38]
Histidine modified mesoporous silica	60	[28]
Mesoporous silica functionalized with carboxylic groups	43	[39]
Mesoporous silica coated chitosan	43	[40]
Cysteine functionalized mesoporous silica	140	[27]
Aspartic acid-functionalized MSNs (Asp-MSNs)	55	In this study
Glycine-functionalized MSNs (Gly-MSNs)	43	In this study