Adsorption Studies of Heavy Metal Ions on Mesoporous Aluminosilicate, Novel Cation Exchanger

Sepehrian, Hamid; Ahmadi, Seyed Javad; Waqif-Husain, Syed; Faghihian, Hossein; Alighanbari, H.

doi:10.1016/j.jhazmat.2009.11.020

Cited by 50 publications

(17 citation statements)

References 20 publications

(30 reference statements)

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“…The pH ZPC of samples was determined by the batch equilibration technique [22]. The process is as follows: 10 mg of the sample in 20 mL 0.1 M NaCl solution.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, characterization, and mercury adsorption properties of hybrid mesoporous aluminosilicate sieve prepared with fly ash

Liu

Hou

et al. 2013

Applied Surface Science

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“…The pH ZPC of samples was determined by the batch equilibration technique [22]. The process is as follows: 10 mg of the sample in 20 mL 0.1 M NaCl solution.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, characterization, and mercury adsorption properties of hybrid mesoporous aluminosilicate sieve prepared with fly ash

Liu

Hou

et al. 2013

Applied Surface Science

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“…The first stage shows a mass loss of ≈8% for pMCM‐41 and 4% for uncalcined AgNP–composites below 140 °C, which can be attributed to the loss of adsorbed water . The second stage is observed between 150 and 300 °C, with a major mass loss of ≈29.4%, 28.7%, 27.2%, and 25.4% for pMCM‐41, Ag1@MCM‐41, Ag2@MCM‐41, and Ag3@MCM‐41, respectively, which is related to the pyrolysis of surfactant (cetyltrimethylammonium bromide, CTAB) cations . The observed mass loss is in accordance with the observation of the disappearance of IR band near 2900 cm −1 which is attributed to CH stretching vibrations (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 97%

Encapsulation of Biosynthesized Nanosilver in Silica Composites for Sustainable Antimicrobial Functionality

et al. 2018

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Silver nanoparticles (AgNPs) have become known as a broad‐spectrum antimicrobial agent. The antimicrobial activity of AgNPs is dependent on the particle size and the dispersion status. In this study, a simple and effective approach is developed for sequestering the biosynthesized AgNPs in silica composites during the gel formation of MCM‐41. Composites with different Ag concentrations of 0.034% (Ag1@MCM‐41), 0.151% (Ag2@MCM‐41), and 0.369% (Ag3@MCM‐41) are synthesized and then heated at 400 °C to produce Ag1@MCM‐41H, Ag2@MCM‐41H, and Ag3@MCM‐41H, respectively. The samples are characterized by flame atomic absorption spectrometry, Fourier‐transform infrared spectroscopy, X‐ray diffraction, N2 physisorption, scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis. The AgNPs are confirmed to be highly dispersed in the amorphous silica framework. The antimicrobial activity of the AgNP–silica samples is investigated against Staphylococcus aureus, Escherichia coli, and Candida albicans using the cup–plate and the plate‐count techniques. The results show an excellent antimicrobial effect of these samples against the studied microorganisms. Importantly, the AgNP–silica samples are found to be stable up to 58 months under ambient conditions. These stable and powerful antimicrobial composites provide a more practical and effective strategy for combating biomedical pathogens and public health threats.

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“…The nanoporous MCM-41 was prepared by mixing sodium silicate as silicon source, and CTAB as surfactant under non-thermal condition (Sepehrian et al 2010). In a typical procedure, 0.6 g CTAB was dissolved in 23 g of demineralized water, then, 3 g of sodium silicate was added and it was stirred for 30 min.…”

Section: Preparation Of Nanoporous Silicate Mcm-41mentioning

confidence: 99%

Studies on the recovery of uranium from nuclear industrial effluent using nanoporous silica adsorbent

Sepehrian

Samadfam

Asadi

2012

Int. J. Environ. Sci. Technol.

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In this paper, the sorption of uranium onto nanoporous silica adsorbent in the presence of nitrate, sulfate, chloride, fluoride and phosphate was studied. The effect of contact time between the nanoporous sorbent and aqueous solution, pH and initial concentration of uranium was also investigated. Uranium sorption onto nanoporous silica adsorbent is a very fast process as sorption rate increases with pH increment. Optimum pH for uranium sorption was 4-8. Experimental sorption isotherm is successfully described by Langmuir and Freundlich models. The results obtained by batch experiments showed that the presence of high concentration of nitrate, sulfate, chloride and phosphate anions alone had no interference with uranium recovery. However, the presence of fluoride ions ([250 mg/L) decreases uranium sorption by about 55 %. The results also showed that the presence of phosphate ions (about 300 mg/L) in solution could remove fluoride interference completely. Finally, the efficiency of the nanoporous silica adsorbent for uranium recovery from wastewater of the uranium conversion facility was investigated.

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Adsorption Studies of Heavy Metal Ions on Mesoporous Aluminosilicate, Novel Cation Exchanger

Cited by 50 publications

References 20 publications

Synthesis, characterization, and mercury adsorption properties of hybrid mesoporous aluminosilicate sieve prepared with fly ash

Synthesis, characterization, and mercury adsorption properties of hybrid mesoporous aluminosilicate sieve prepared with fly ash

Encapsulation of Biosynthesized Nanosilver in Silica Composites for Sustainable Antimicrobial Functionality

Studies on the recovery of uranium from nuclear industrial effluent using nanoporous silica adsorbent

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