Synthesis of Macro‐Mesoporous MCM‐41 and Its Use in Methylene Blue Adsorption

Thomé, Andreas Georg; Harms, Corinna; Roessner, F.

doi:10.1002/cite.201600168

Cited by 4 publications

(1 citation statement)

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“…Based on the data obtained (Tables 1 and 2), it was proved that an increase in the nickel content in nickel silicates does not lead to a noticeable degradation of the mesoporous structure of adsorbents and a decrease in their sorption characteristics relative to methylene blue. The sorption capacities were found for all samples in the range 39-42 mg/g and the removal efficiency reached 91-100%, which is comparable (Table 3) to the performance of other mesoporous silica sorbents of MCM-41 type, obtained by a more complex alkoxide method and modified with transition metals [28,53,54], or significantly inferior to neat mesoporous SBA-15 silica with double-sized pores [55,56]. It can be seen that the inclusion of Ni does not influence noticeably the sorption capacity.…”

Section: Removal Of Methylene Blue Dye From Aqueous Media By Nickel-c...supporting

confidence: 70%

Design of Nickel-Containing Nanocomposites Based on Ordered Mesoporous Silica: Synthesis, Structure, and Methylene Blue Adsorption

Kouznetsova,

Ivanets,

Prozorovich

et al. 2024

Gels

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Mesoporous materials containing heteroelements have a huge potential for use as catalysts, exchangers, and adsorbents due to their tunable nanometer-sized pores and exceptionally large internal surfaces accessible to bulky organic molecules. In the present work, ordered mesoporous silica containing Ni atoms as active sites was synthesized by a new low-temperature method of condensation of silica precursors on a micellar template from aqueous solutions in the presence of nickel salt. The homogeneity of the resulting product was achieved by introducing ammonia and ammonium salt as a buffer to maintain a constant pH value. The obtained materials were characterized by nitrogen sorption, X-ray and neutron diffraction, scanning electron microscopy, infrared spectroscopy, and thermal analysis. Their morphology consists of polydisperse spherical particles 50–300 nm in size, with a hexagonally ordered channel structure, high specific surface area (ABET = 900–1200 m2/g), large pore volume (Vp = 0.70–0.90 cm3/g), average mesopore diameter of about 3 nm, and narrow pore size distribution. Adsorption tests for methylene blue show sorption capacities reaching 39–42 mg/g at alkaline pH. The advantages of producing nickel silicates by this method, in contrast to precipitation from silicon alkoxides, are the low cost of reagents, fire safety, room-temperature processing, and the absence of specific problems associated with the use of ethanol as a solvent, as well as the absence of the inevitable capture of organic matter in the precipitation process.

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