Engineered adsorptive materials for water remediation - Development, characterization, and application

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Bhatnagar, Amit, Asst. Prof., University of Eastern Finland, Finland Yazdani, Maryam Roza 2018-03-29T09:02:41Z 2018-03-29T09:02:41Z 2018
dc.identifier.isbn 978-952-60-7920-2 (electronic)
dc.identifier.isbn 978-952-60-7919-6 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract Engineering alternative eco-friendly techniques for water remediation is a global aim due to the serious contaminations of water sources and strict standards of water quality. Engineered polymer-based adsorptive materials have emerged as new alternatives to activated carbon. Engineered adsorptive materials with embedded inorganic constituent(s) in polymeric matrix provide an opportunity to remove a diverse range of contaminants. Combining the advantages of inorganic and polymeric materials, these engineered materials exhibit enhanced properties e.g., porous structure and easy separation. Particularly, engineered adsorptive materials containing nano-sized titanium dioxide (n.TiO2) exert simultaneous adsorption and photocatalysis. These newly raised materials are new alternatives with a bright prospect in environmental remediation. This dissertation introduces new-engineered adsorptive materials for water remediation. It highlights the fundamental challenges of engineering adsorptive materials from well-known initial materials, chitosan, n.TiO2, and feldspar, for the remediation of water polluted with arsenic, Acid Black 1 dye, and phosphate in laboratory-scale. It focuses on preparing the engineered adsorptive materials, charactering them via common methods e.g., Fourier Transform Infrared Spectroscopy and X-ray Diffraction, and applying them for adsorptive (photoactive) removal of the target pollutants. The adsorption process is explored via kinetic, isotherm, and thermodynamic studies. The adsorptive materials are engineered considering the strengths and drawbacks of initial materials; e.g., n.TiO2 provides high surface area and photo-oxidation, chitosan supplies support matrix and gravity separation, and feldspar lowers the cost and improves the surface texture. The engineered materials showed improved structures and removal performances. The study of material properties revealed their functional groups, compositions, and porosity. The engineered materials embedding n.TiO2 showed enhanced UV-assisted adsorption of the dye and arsenic. UV irradiation enhanced the removal from 33% to 73% for arsenate (5 mg/L), from 23% to 84% for arsenite (5 mg/L), and from 86% to 97% for the dye (50 mg/L). Zinc-functionalized chitosan showed an improved phosphate uptake from 1.45 to 6.55 mg/g compared with plain chitosan. Adsorption kinetics indicated fast removal rates. Modeling of adsorption isotherm and kinetics via theoretical models provided fundamental information about the adsorptive surface properties and adsorption reactions. The adsorption reactions were thermodynamically spontaneous and favorable. The correspondence between the theory behind the models and properties of the engineered materials along with removal mechanisms are discussed. This dissertation provides fundamental knowledge e.g., in designing water treatment units. In summation, the experimental data and theoretical considerations support the applicability of the engineered adsorptive materials for water remediation.    en
dc.format.extent 68 + app. 62
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 58/2018
dc.relation.haspart [Publication 1]: M. R. Yazdani, A. Bhatnagar, R. Vahala, Synthesis, characterization and exploitation of nano-TiO2/feldspar embedded chitosan beads towards UV-assisted adsorptive abatement of aqueous arsenic (As). Chemical Engineering Journal 316 (2017) 370–382. DOI: 10.1016/j.cej.2017.01.121
dc.relation.haspart [Publication 2]: M. R. Yazdani, T. Tuutijärvi, A. Bhatnagar, R. Vahala, Adsorptive removal of arsenic(V) from aqueous phase by feldspars: kinetics, mechanism, and thermodynamic aspects of adsorption. Journal of Molecular Liquids 214 (2016) 149–156. DOI: 10.1016/j.molliq.2015.12.002
dc.relation.haspart [Publication 3]: M. Yazdani, H. Bahrami, M. Arami, Feldspar/titanium dioxide/chitosan as a biophotocatalyst hybrid for the removal of organic dyes from aquatic phases, Journal of Applied Polymer Science 131 (2014) 40247. DOI: 10.1002/app.40247
dc.relation.haspart [Publication 4]: M. R. Yazdani, E. Virolainen, K. Conley, R. Vahala, Chitosan–zinc(II) complexes as a bio-sorbent for the adsorptive abatement of phosphate: Mechanism of complexation and assessment of adsorption performance, Polymers 10 (2018) 25. DOI: 10.3390/polym10010025
dc.subject.other Civil engineering en
dc.subject.other Environmental science en
dc.title Engineered adsorptive materials for water remediation - Development, characterization, and application en
dc.type G5 Artikkeliväitöskirja fi Insinööritieteiden korkeakoulu fi School of Engineering en
dc.contributor.department Rakennetun ympäristön laitos fi
dc.contributor.department Department of Built Environment en
dc.subject.keyword engineered adsorptive materials en
dc.subject.keyword UV-photoactive en
dc.subject.keyword chitosan en
dc.subject.keyword TiO2 en
dc.subject.keyword feldspar en
dc.subject.keyword adsorption en
dc.subject.keyword water treatment en
dc.subject.keyword arsenic en
dc.subject.keyword dye en
dc.subject.keyword phosphate en
dc.identifier.urn URN:ISBN:978-952-60-7920-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Vahala, Riku, Prof., Aalto University, Department of Built Environment, Finland
dc.opn Lassi, Ulla, Prof., University of Oulu, Finland
dc.contributor.lab Water and Environmental Engineering en
dc.rev Zimmerman, Julie Beth, Asst. Prof., Yale University, USA
dc.rev Lima, Éder Cláudio, Prof., Federal University of Rio Grande do Sul, Brazil 2018-04-13
local.aalto.acrisexportstatus checked 2019-02-23_1020

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