Facile synthesis of hierarchical MCM-41 spheres with an ultrahigh surface area and their application for removal of methylene blue from aqueous solutions

Abstract

Hierarchical mesoporous silica spheres were prepared by a simple sol–gel method and used for the removal of methylene blue from aqueous solutions.

Adsorption performance of mesoporous silicas towards a cationic dye. Influence of mesostructure on adsorption capacity

“…Also, the dye solubility usually increases as temperature raises weakening the adsorbate‐adsorbent interactions and impeding the adsorption process. Other authors for mesoporous silicas have previously reported this behavior …”

“…They reported a maximum adsorption capacity for both silicas between 3.2 and 3.7 × 10 −5 mol g −1 . In addition, Qu et al reported a value of 2.4 × 10 −4 mol g −1 for the same dye using MCM‐41 obtained from sodium metasilicate. In the present work, the TBO adsorption capacity found for MCM‐41 and MCM‐48 was calculated at approximately 7.3 × 10 −5 mol g −1 .…”

“…The last one has proven to be the most efficient due to its high efficiency, low process cost, easy operation, flexibility, and insensitivity to specific toxic substances. Different type of adsorbents such as activated carbon, zeolite, clay, synthetic polymers and mesoporous silica have been used in the removal of dyes from aqueous solution.…”

Multifunctional sandwich-like mesoporous silica–Fe3O4–graphene oxide nanocomposites for removal of methylene blue from water

“…Therefore, the adsorption capacity is obviously increased by the electrostatic attraction between the negatively charged adsorbent and positively charged MB. [40][41][42][43] Three well-known adsorption models pseudo-rst-order, pseudo-second-order, Elovich were used to investigate the dynamics of the adsorption process. The adsorption model equations are listed as follows:…”

Synthesis and characteristics of SBA-15 with thick pore wall and high hydrothermal stability

“…Emphasis has already been placed on the fact that mesoporous materials have superior structure properties, such as large specific surface area, uniformity large pore diameter and thick silica wall, and potential apply in the fields of catalysis, adsorption, separation, drugs delivery and optical devices [1][2][3][4]. However, one main reason that these mesoporous materials have not been widely applicated in industry is their relatively poor hydrothermal stability.…”