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Full-Text Articles in Physical Sciences and Mathematics
Zeolitic Volcanic Tuffs From Macicas (Cluj County), Natural Raw Materials Used For Nh4+ Removal From Wastewaters, Horea Bedelean, Maria Stanca, Andrada MăIcăNeanu, Silvia Burcă
Zeolitic Volcanic Tuffs From Macicas (Cluj County), Natural Raw Materials Used For Nh4+ Removal From Wastewaters, Horea Bedelean, Maria Stanca, Andrada MăIcăNeanu, Silvia Burcă
Studia UBB Geologia
Volcanic tuffs out cropping in Măcicaş area (Cluj County) have been investigated and tested for their ammonium removal capacity. The zeolitic volcanic tuffs from Măcicaş are mainly represented by vitric and vitric crystal tuffs. In this region, significant amounts of volcanic glass in the pyroclastic sequence have been replaced by zeolites (between 50-80 %). The main zeolite species identified in volcanic tuffs from Măcicaş is clinoptilolite and subordinately mordenite. The zeolitic tuff samples considered in zeolitic sodium form (labeled M1-Na and M2-Na) are tested in ammonium removal experiments. The ammonium ions were completely removed from 0.0716g/dm3 NH4+ solution onto 10g …
New Data On The Volcanic Tuff From Petrestii De Jos (Cluj District), Horea Bedelean, Ioan Ivan, Dana Pop, Ioan Bedelean, Gheorghe Pleșoiu
New Data On The Volcanic Tuff From Petrestii De Jos (Cluj District), Horea Bedelean, Ioan Ivan, Dana Pop, Ioan Bedelean, Gheorghe Pleșoiu
Studia UBB Geologia
The present study was carried out on the cineritic interlayers from Petreştii de Jos (closed quarry from Indolului Valley), in order to present their detailed mineralogical-petrographical features. Previous work already noticed the similarity of this tuff level with Dej Tuff Complex in other areas. The studied outcrop consists of a compact volcanic tuff interlayered with marls and tuffaceous clays. The analytical investigations: chemical analyses, X-ray diffraction, IR spectroscopy and electron microscopy reveal the nature of the diagenetic transformations dominated by zeolitization. Besides clinoptilolite, which is the typical zeolite for Dej Tuff from the Transylvanian Depression, our investigation evidenced also the …
Investigations On Some Zeolitic Volcanic Tuffs From Cluj County (Romania), Used For Zinc Ions Removal From Aqueous Solution, Horea Bedelean, Andrada Maicaneanu, Silvia Burca, Maria Stanca
Investigations On Some Zeolitic Volcanic Tuffs From Cluj County (Romania), Used For Zinc Ions Removal From Aqueous Solution, Horea Bedelean, Andrada Maicaneanu, Silvia Burca, Maria Stanca
Studia UBB Geologia
Representative samples of zeolitic tuffs from Măcicaş, Aluniş and Apahida occurrences (Cluj County, Romania) were investigated using optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and wet chemical analyses. The studied tuffs samples are mainly represented by vitric and vitric crystal varieties. The mineral assemblage suggests a rhyo-dacitic petrographic type of the volcanic tuff. Diagenetic alteration process in the pyroclastic sequence from this region led to the formation of zeolites, mainly clinoptilolite. The zeolitic tuffs under study can be used in wastewaters treatment to remove Zn2+ ions. Zn2+ removal was performed on some bulk samples: Aluniş (labelled A1), Apahida …