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Organics adsorption on novel amorphous silica and silica xerogels: microcolumn rapid breakthrough test coupled with sequential injection analysis

Luca Tasca, A, Fletcher, AJ, Ghajeri, F, Maya Alejandro, F ORCID: 0000-0003-1458-736X and Turnes Palomino, G 2019 , 'Organics adsorption on novel amorphous silica and silica xerogels: microcolumn rapid breakthrough test coupled with sequential injection analysis' , Journal of Porous Media, vol. 22, no. 8 , pp. 1001-1014 , doi: 10.1615/JPorMedia.2019024612.

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Abstract

The adsorption capacities of a novel amorphous silica and silica xerogels for aromatic compounds were investigatedusing microcolumn rapid breakthrough tests coupled with sequential injection flow-based automated instrumentationin 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 usingautomated flow-based techniques. Benzene was selected as the target dissolved organic compound usually present inproduced waters from the oil and gas sector, continuously increasing. 3,4-Dichloroaniline (3,4-DCA) was selected aspart of the endocrine disrupting chemicals, which are becoming a source of major concern for human and wildlifetoxicity. Novel amorphous silicas were synthesized at low temperature and under ambient pressure from a sodiummetasilicate precursor and were subjected to postsynthetic methylation. Silica xerogels were prepared via acid catalysisof a sodium metasilicate solution and functionalized with trimethylchlorosilane at low temperature and under ambientpressure. The removal efficiency of the silica xerogels tested was found to be equal to or 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 to be > 4.63 and > 7.17 mg/g, respectively,at flow rates of 1.8 and 0.6 mL/min.

Item Type: Article
Authors/Creators:Luca Tasca, A and Fletcher, AJ and Ghajeri, F and Maya Alejandro, F and Turnes Palomino, G
Keywords: pollutant extraction, 3D printing
Journal or Publication Title: Journal of Porous Media
Publisher: Begell House, Inc.
ISSN: 1934-0508
DOI / ID Number: 10.1615/JPorMedia.2019024612
Copyright Information:

© 2019 by Begell House

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