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Title:Formation of meso- and micro-pores in fly-ash zeolites using a three-step activation
Authors:Jha, Bhagwanjee (Author)
Singh, D. N. (Author)
Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Authorship owner)
Files:.pdf Acta_geotechnica_Slovenica_2014_Jha,_Singh_Formation_of_meso-_and_micro-pores_in_fly-ash_zeolites_using_a_three-step_activation.pdf (298,21 KB)
 
URL http://fgserver3.fg.um.si/journal-ags/2014-1/article-6.asp
 
Language:English
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:Researchers have comprehensively characterized alkali- activated fly-ash (the residue) and ascertained its highly zeolitic nature. In order to evaluate its potential for application as an adsorbent for the decontamination of waste water, the decisive parameters have mostly been the cation-exchange capacity, the mineralogy and the morphology of the residue. However, a study of the pore characteristics (e.g., the size and volume) of such residues is still warranted to anticipate their contaminant transport and the diffusion phenomena as a type of geotechnical engineering material. In this situation, the present study demonstrates the evolution of pores in the fly-ash after alkali activation up to three steps, and simultaneously, its effects` on other characteristics (e.g., the specific gravity, specific surface area and the cation-exchange capacity) of three types of similarly synthesized residues (the first, produced by using a NaOH aqueous solution and the other two residues, the result of alkali activation using a NaOH spent solution, the filtrates). Based on N2 gas absorption isotherms and infrared transmittance spectra, residues obtained from the second and third steps, each involving 24 hours of treatment using filtrates of 1.5-M NaOH, are established to be significantly enriched in the finer meso- and micro-pores, respectively, in comparison with a pure and macro-porous zeolite 4A.
Keywords:fly-ash, hydrothermal treatment, three-step activation, pore characteristics
Year of publishing:2014
Number of pages:str. 63-69
Numbering:št. 1, Letn. 11
ISSN:1854-0171
UDC:66.046.59:549.67
ISSN on article:1854-0171
COBISS_ID:281005056 Link is opened in a new window
NUK URN:URN:SI:UM:DK:0JZR1B18
Copyright:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
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Record is a part of a journal

Title:Acta geotechnica Slovenica
Shortened title:Acta geotech. Slov.
Publisher:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
ISSN:1854-0171
COBISS.SI-ID:215987712 New window

Secondary language

Language:Slovenian
Title:Tvorjenje mezopor in mikropor v elektrofiltrskem pepelu zeolita s tri-stopenjsko aktivacijo
Abstract:Raziskovalci so izčrpno opisali lastnosti bazno aktiviranega elektrofiltrskega pepela (ostanek) in potrdili njegove zeolitske lastnosti. Za vrednotenje njegovih uporabnih možnosti kot adsorbenta za dekontaminacijo odpadnih voda, so odločilni parametri večinoma ionska izmenjalna kapaciteta, mineralogija in morfologija. Vendar je študija lastnosti por (t.j. velikost in volumen) takšnih ostankov, še vedno osnova za predvidevanje o njihovi sposobnosti transporta onasneževalcev in pojavu difuzije. Pričujoča študija prikazuje razvoj por pri treh vrstah podobno sintetiziranih elektrofiltrskih pepelov po bazni aktivaciji in istočasno ta učinek na ostale lastnosti, t.j. specifično gravitacijo, specifično površino in ionsko izmenjalno kapaciteto. Na podlagi N2 plinske absorpcije in infrardeče spektroskopije je dokazano, da so ostanki, pridobljeni v drugi in tretji stopnji aktivacije (vsak je bil v obdelavi 24 ur z uporabo filtratov 1,5M NaOH), bistveno obogateni z mezoporami in mikroporami v primerjavi s čistim in makro poroznim zeolitom 4A.
Keywords:lastnosti por, onesnaževanje, elektrofiltrski pepel, zeoliti, hidrotermalni postopek, tristopenjska aktivacija


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