Preparation and characterization of double metal-silica sorbent for gas filtration

Afriyie, Ebenezer Twumasi; Norberg, Peter; Sjöström, Christer; Forslund, Mikael

doi:10.1007/s10450-012-9411-5

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…A 500 mL salt solution, consisting of MgCl 2 hexahydrate and CaCl 2 dihydrate was prepared at a ratio of 68 mol% Mg and 32 mol% Ca; 500 mL salt solution, was poured onto 1.5 M (with respect to SiO 2 ) sodium silicate solution (500 mL), and the resulting mixture agitated at room temperature. Subsequent coagulation occurred, as previously described (Twumasi Afriyie et al., 2013), and the obtained gel was washed, filtered and dried in the same manner as ND.…”

Section: Methodsmentioning

confidence: 99%

Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds

Tasca

Ghajeri

Fletcher

2017

Adsorption Science & Technology

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Very few studies have investigated the adsorption performance of hydrophobic and hydrophilic silicas with dissolved organics in water, which is a required final step during produced water treatment. The cost of functionalization also hinders the use of hydrophobic materials as sorbents. Novel hydrophilic silicas, prepared at low temperature and ambient pressure, were characterised by SEM, FTIR and BET analysis, and studied for the adsorption of aqueous phase organic compounds at concentrations below their solubility limits. Adsorption capacities were found to be up to 264 mg/g for benzene and 78.8 mg/g for toluene. Direct comparison is made with the analogous hydrophobic version of one of the silica materials, demonstrating comparable uptakes for benzene concentrations lower than 50 mg/L. This finding supports the hypothesis that, at very low aqueous phase organic concentrations, hydrophobicization has no discernible effect on access of the pollutants to the internal porosity of the material.

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Section: Methodsmentioning

confidence: 99%

Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds

Tasca

Ghajeri

Fletcher

2017

Adsorption Science & Technology

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“…CMS samples were prepared by mixing magnesium chloride hexahydrate (68 mol% Mg) and calcium chloride dihydride (32 mol% Ca) before adding to a sodium metasilicate solution, at a concentration ratio of 1:2. Coagulation occurred, as previously described (Twumasi Afriyie et al, 2013), and the resulting gel was washed, filtered and dried, as described for ND samples. Hydrophobic NDH, Z1H and CMSH were prepared, by SvAAB, via methylation of the hydrophilic analogues.…”

Section: Quartzenementioning

confidence: 99%

Organics Adsorption on Novel Amorphous Silica and Silica Xerogels: Microcolumn Rapid Breakthrough Test Coupled With Sequential Injection Analysis

et al. 2019

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The adsorption capacities of a novel amorphous silica, and silica xerogels, for aromatic compounds were investigated using Micro Column Rapid Breakthrough tests coupled with Sequential Injection Flow-based automated instrumentation, in order to evaluate their operative feasibility under conditions typically used in water treatment facilities. Extraction columns were fabricated using stereolithographic 3D printing. Sorbent reusability was also investigated using automated flow-based techniques. Benzene was selected as target dissolved organic compound usually present in produced waters from the oil and gas sector, continuously increasing. 3,4-dichloroaniline (3,4-DCA) was selected as part of Endocrine Disrupting Chemicals, which are becoming source of major concern for human and wildlife toxicity. Novel amorphous silica were synthesised at low temperature and under ambient 2 pressure from a sodium metasilicate precursor, and were subject to post-synthetic methylation. Silica xerogels were prepared via acid catalysis of a sodium metasilicate solution and functionalised with trimethylchlorosilane, at low temperature and under ambient pressure. The removal efficiency of the silica xerogels tested was found equal greater than 22.62 mg/g for benzene at a flow rate of 0.6 mL/min, while the uptake of 3,4-DCA was found >4.63 mg/g and >7.17 mg/g, respectively at flow rates of 1.8 mL/min and 0.6 mL/min.

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“…In view of the preceding statements and the published reports such as on testing selectivity, metal binding capacities of adsorbents offered a reasonable basis for the search for new, inherent, environmentally friendly and potentially achievable metal adsorbents. Learning from Twumasi et al 42 on preparation and characterisation of the double metal-silica sorbent for gas filtration, in this work a facile strategy was adopted to obtain precipitated silica agglomerates which were later reinforced with cellulose nanofibrils prior to utilising the resultant material as an effective multi heavy metal remover. A parametric study was proposed to understand the kinetics of adsorption thereby studying the potential of silica cellulose-based material in detection and removal of Pb( ii ), Hg( ii ), Cr( iii ) and Cd( ii ) ions from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Precipitated silica agglomerates reinforced with cellulose nanofibrils as adsorbents for heavy metals

et al. 2018

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Preparation and characterization of double metal-silica sorbent for gas filtration

Cited by 4 publications

References 17 publications

Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds

Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds

Organics Adsorption on Novel Amorphous Silica and Silica Xerogels: Microcolumn Rapid Breakthrough Test Coupled With Sequential Injection Analysis

Precipitated silica agglomerates reinforced with cellulose nanofibrils as adsorbents for heavy metals

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