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Characterization of a silica based nano/mesoporous material for adsorption application: A study of the relation between synthesis, structure and adsorption efficiency
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

During last years the interest in large scale production of nano/mesoporous materials has increased in the industry due to benefits that these materials can provide. Silica based nanomaterials are examples of such materials with large specific surface area and pore volume where the porous structure is the key for the resulting properties leading to efficiency in e.g. filtration applications.

The aim of this research was to contribute knowledge on understanding the porous structure and its relation to the efficiency. For this approach, the porous structure of a nano/mesoporous silica-based material is characterized. The analysis of this material is a challenge as it has a wide range of pores in the structure from a few nanometres to several micrometres. Electron microscopy (EM) methods are used for the structural analysis of the materials as a complementary method to nitrogen adsorption (NA). The samples are analysed as powders and the relation between the structure and efficiency in the application is discussed.

Through this research different synthesis pathways have been studied under the family name of Quartzene®, and the differences in the resulting structure is discussed. The synthesis and storage conditions have been varied in order to study the effect on the porous structure.

Place, publisher, year, edition, pages
Department of Engineering Sciences , 2019. , p. 77
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-383286OAI: oai:DiVA.org:uu-383286DiVA, id: diva2:1315236
Presentation
2019-06-10, Polhemsalen, Lägerhyddsvägen 1, Ångströmlaboratoriet, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2019-05-20 Created: 2019-05-13 Last updated: 2019-05-24Bibliographically approved
List of papers
1. Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds
Open this publication in new window or tab >>Novel hydrophilic and hydrophobic amorphous silica: Characterization and adsorption of aqueous phase organic compounds
2018 (English)In: Adsorption Science and Technology, ISSN 0263-6174, E-ISSN 2048-4038, Vol. 36, no 1-2, p. 327-342Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
SAGE PUBLICATIONS INC, 2018
Keywords
Quartzene, benzene, toluene, produced water, GC
National Category
Physical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-348381 (URN)10.1177/0263617417692339 (DOI)000425022800020 ()
Available from: 2018-04-16 Created: 2018-04-16 Last updated: 2019-05-13Bibliographically approved
2. Organics adsorption on novel amorphous silica and silica xerogels: microcolumn rapid breakthrough test coupled with sequential injection analysis
Open this publication in new window or tab >>Organics adsorption on novel amorphous silica and silica xerogels: microcolumn rapid breakthrough test coupled with sequential injection analysis
Show others...
2019 (English)In: Journal of Porous Media, ISSN 1091-028X, E-ISSN 1934-0508, Vol. 22, no 8, p. 1001-1014Article in journal (Refereed) Published
Abstract [en]

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 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.

Place, publisher, year, edition, pages
Begell House, 2019
Keywords
SIA, SPE, 3, 4-DCA, EDCs, 3D printing, benzene, breakthrough curves
National Category
Engineering and Technology Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-383258 (URN)10.1615/JPorMedia.2019024612 (DOI)000485125800008 ()
Available from: 2019-05-12 Created: 2019-05-12 Last updated: 2019-10-11Bibliographically approved
3. Case Study of a Green Nanoporous Material from Synthesis to Commercialisation: Quartzene®
Open this publication in new window or tab >>Case Study of a Green Nanoporous Material from Synthesis to Commercialisation: Quartzene®
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2018 (English)In: Current Opinion in Green and Sustainable Chemistry, ISSN 2452-2236, Vol. 12, p. 101-109Article in journal (Refereed) Published
Abstract [en]

Synthetic amorphous silicas with high porosity (94–97%) are introduced and various pathways for their synthesis are presented. The materials have structures with high surface area (300–750 m2/g) and are commercialised under the name of Quartzene®. Low cost silica sources and ambient pressure drying enable production in large scale with approximately 70% cost reduction as compared to conventional method silica aerogels. The structure is analysed, properties are reported as low density (0.04–0.15 g/ml), low thermal conductivity (24–26 mW/m·K), etc. Formaldehyde gas adsorption tests reveal that the uptake level of samples made by Quartzene® is significantly increased as compared to commercially available adsorbents. Thermal conductivity at elevated temperatures for mixtures of Quartzene® and stone wool shows a 23% reduction at 650 °C as compared to pure stone wool. Scaling up process for this green material meeting environmental sustainability demands in industrial manufacturing is discussed and challenges/current developments are presented.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
green nanoporous materials, green chemistry, silica based materials
National Category
Materials Chemistry Engineering and Technology
Research subject
Engineering Science with specialization in Materials Science; Engineering Science with specialization in Materials Analysis
Identifiers
urn:nbn:se:uu:diva-359840 (URN)10.1016/j.cogsc.2018.07.003 (DOI)000445965000017 ()
Funder
EU, Horizon 2020, 718823
Note

Highlights

•Water based chemistry and ambient pressure drying technique is used for synthesis of a silica based nanoporous material.

•Properties are characterized as: 94–97% Porosity, High surface area (300–750 m2/g), Low density (0.04–0.15 g/ml), etc.

•The material is cost-efficient and supports industrial application areas with benign environmental effects.

Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2019-05-13Bibliographically approved

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