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Öğe ADSORPTION OF CRYSTAL VIOLET FROM AQUEOUS SOLUTION ON ACTIVATED CARBON DERIVED FROM GOLBASI LIGNITE(Oficyna Wydawnicza Politechniki Wroclawskiej, 2012) Depci, Tolga; Kul, Ali Riza; Onal, Yunus; Disli, Erkan; Alkan, Salih; Turkmenoglu, Z. FundaActivated carbon (AC) was obtained from lignite of the local resource, Golbasi - Adiyaman (Turkey) by chemical activation. The Golbasi lignite was chosen as the precursor for its availability and low cost. The BET surface area of the activated carbon was found 921 m2/g. The AC was used as an adsorbent for Crystal Violet (CV) in aqueous solution. The adsorption properties of CV onto the activated carbon are discussed in terms of the adsorption isotherms (Langmuir and Freundlich) and the kinetic models (pseudo-first-order, pseudo-second-order and intraparticle diffusion model). It was shown that the experimental results best fitted by the Langmuir model, and the second-order kinetic equation. The thermodynamic parameters show that the adsorption process is endothermic. The experimental results point out that the obtained activated carbon is a viable candidate for sorbent removing CV from aqueous solutions.Öğe Adsorption of Crystal Violet on Activated Carbon Prepared from Coal Flotation Concentrate(Iop Publishing Ltd, 2016) Aydogmus, Ramazan; Depci, Tolga; Sarikaya, Musa; Kul, Ali Riza; Onal, YunusThe objective of this study is firstly to investigate the floatability properties of Zilan-Van coal after microwave irradiation and secondly to produce activated carbon from flotation concentrate in order to remove Crystal Violet (CV) from waste water. The flotation experiments showed that microwave heating at 0.9 kW power level for 60 sec exposure time enhanced the hydrophobicity and increased the flotation yield. The activated carbon with remarkable surface area (696 m(2)/g) was produced from the flotation concentrate and used to adsorb CV from aqueous solution in a batch reactor at different temperature. The adsorption properties of CV onto the activated carbon are discussed in terms of the adsorption isotherms (Langmuir and Freundlich) and found that the experimental results best fitted by the Langmuir model.Öğe Apricot stone activated carbons adsorption of cyanide as revealed from computational chemistry analysis and experimental study(Elsevier, 2014) Depci, Tolga; Onal, Yunus; Prisbrey, Keith A.This study utilizes computational chemistry analysis (molecular dynamics and ab initio simulations) in order to understand the nature of adsorption of cyanide from aqueous solution by activated carbon and to compare the adsorption mechanism between activated and magnetic activated carbons. In addition, real adsorption mechanism of cyanide was investigated by laboratory adsorption tests using apricot plain (AAC) and magnetic activated (AMAC) carbon. The morphology, structure and property of AAC and AMAC were determined by BET, XRD, XRF and magnetometer, respectively. The simulation results reveal that the adsorption mechanism of cyanide on AAC and AMAC is nearly similar. Modifying the graphite surface with magnetite to mimic magnetic activated carbon does not have any significant influence on cyanide adsorption. The experimental results also support this fact to some extent as the maximum monolayer adsorption capacities of AAC and AMAC are very close with each other, 61.56 and 59.71 mg/g, respectively. Although iron impregnation does not significantly affect the removal of cyanide, considering the magnetic property of AMAC which can be removed easily by a magnetic separator, AMAC may be better sorbet than AAC and commercial activated carbon. (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.Öğe CHARACTERISTIC PROPERTIES OF ADSORBED CATALASE ONTO ACTIVATED CARBON BASED ADIYAMAN LIGNITE(Parlar Scientific Publications (P S P), 2011) Depci, Tolga; Alkan, Salih; Kul, Ali Riza; Onal, Yunus; Alacabey, Ihsan; Disli, ErkanCatalase is one of the most common and important enzymes in biological systems. However, its purification process has some difficulties and it can be easily decomposed in aqueous or nonaqueous solutions. Therefore, a catalase should be adsorbed on solid materials to reduce its inactivation and to increase its economic value. Activated carbon which was obtained from Turkish low-rank coal (Golbasi-Adiyaman) by chemical activation was used as a solid carrier to adsorb catalase for the first time in this research. The pore structure of the activated carbon was determined by A Tri Star 3000 (Micromeritics, USA) surface analyzer and scanning electron microscope. In order to determine adsorption properties of catalase, ionic strength effect, temperature-activity, pH-activity, storage stability and operational stability of the activated carbon were investigated. The kinetic and thermodynamic mechanisms of adsorbed enzyme were also studied. The experimental results pointed out that the obtained activated carbon is a viable candidate for an alternative solid carrier for catalase and it may be a promising material for various biotechnological applications.Öğe Characterization and evaluation of the antimicrobial properties of algal alginate; a potential natural protective for cosmetics(Marmara Univ, 2022) Sayin, Selin; Depci, Tolga; Naz, Mehmet; Sezer, Selda; Karaaslan, Merve Goksin; Aras, Aycan; Ugur, SinemSargassurn vulgare was sampled by free dives in Iskenderun Bay, Hatay, Turkey, in September 2018. Sargassum vulgare is a material with high economic value because it has compounds that can be used in medical applications such as alginic acid and at the same time it contains carbohydrates and vitamins. Alginates were extracted with a sequential extraction protocol from Sargassum vulgare. Structural characterization of alginate obtained from Sargassum vulgare was determined by FT-IR spectrum, phase structure by XRD diffractometer, and surface morphology by SEM image. Within the scope of the study, alginate obtained from Sargassurn vulgare and herbal preservative 705 used in the field of cosmetics were compared. After pretreatment of Sargassurn vulgare with ethanol, alginate extraction was performed. Microorganisms of Pseudontonas aeruginosa, Staphylococcus aureus, Candida albicans, Escherichia soli, Aspergillus brasiliensis were used to examine the antimicrobial activity of the obtained alginate and showed that the contamination risk was tolerable for all microorganisms examined on the seventh day of incubation. Alginate obtained from Sargassum vulgare was found to be more effective than herbal preservative 705 at 0 hours. Pseudomonas aeruginosa, Staphylococcus aureus are microorganisms with the highest effect in the 0 hour. Since alginate obtained from Sargassurn vulgare is more effective on microorganisms in a shorter time than herbal preservative 705, it is predicted that it can be a product that can be used in the field of cosmetics.Öğe Co-liquefaction Behaviour of Elbistan Lignite and Olive Bagasse(Iop Publishing Ltd, 2016) Karta, Mesut; Depci, Tolga; Karaca, Huseyin; Onal, Mehmet; Coskun, M. AliIn the present study, co-liquefaction potential of Elbistan lignite and Balikesir olive bagasse were investigated by direct coal liquefaction process. The olive bagasse is a cheap and abundant biomass, so it is used to decrease the cost of oil production from the lignite. The effect of blending ratio of the lignite and the olive bagasse on liquefaction conversion and oil yield were investigated. Characterization studies of the starting materials were done using XRD, FTIR, DTA/TG and elemental analysis. Elemental compositions of liquefaction products were also determined and the composition of the obtained oil was identified by GC/MS. DTA and TGA results indicated the synergistic effect of the lignite and the olive bagasse and maximum oil conversion (36 %) was obtained from 1: 3 blending ratio of lignite: olive bagasse. The results showed that the obtained oil was paraffinic-low waxy oil with 22.5 MJ/kg of calorific value and 0.95 g/cm(3) density.Öğe Competitive adsorption of lead and zinc from aqueous solution on activated carbon prepared from Van apple pulp: Study in single- and multi-solute systems(Elsevier Science Sa, 2012) Depci, Tolga; Kul, Ali Riza; Onal, YunusThe potential of activated carbon (VAAC) prepared from local agricultural waste, apple pulp, as an alternative low-cost adsorbent was investigated for the removal of lead and zinc from single- and multi metal aqueous solution. VAAC was produced with a reasonable yield, 43% and has remarkable surface area (1067.01 m(2)/g) with a well-developed pore structure. To determine the adsorption process and properties, the effects of various operating parameters, pH of the solutions (2-6), adsorbent dosage (0.01-0.2 g), initial concentration of metal ions (25-40 mg/L), contact time (3-120 min) and temperature (298-308 K) were investigated in a batch adsorption technique. The adsorption isotherm data were better fitted by Langmuir model. The pseudo second-order model was found more applicable to describe the kinetic of system in both the single- and multi-solute system. The adsorption capacities of heavy metals decrease in the order of Pb(II) (15.96 mg/g) < Pb (Pb + Zn) (13.23 mg/g) < Zn(II) (11.72 mg/g) < Zn (Pb + Zn) (7.54 mg/g) at 298 K. Although individual metal ions adsorption decreases in multi-system. the more metal ions are adsorbed (20.77 mg/g). The intraparticle diffusion model, external mass transfer coefficient, film and pore diffusion coefficient at different temperatures were also evaluated to investigate the adsorption mechanisms of both systems. The adsorption was mainly controlled film diffusion process at all operating temperatures and concentrations. The thermodynamic parameters indicate that the adsorption process is endothermic, feasible and thermodynamically favored. (C) 2012 Elsevier B.V. All rights reserved.Öğe Computational Chemistry Approach to Interpret the Crystal Violet Adsorption on Golbasi Lignite Activated Carbon(Iop Publishing Ltd, 2016) Depci, Tolga; Sarikaya, Musa; Prisbrey, Keith A.; Yucel, AysegulIn this paper, adsorption mechanism of Crystal Violet (CV) dye from the aqueous solution on the activated carbon prepared from Golbasi lignite was explained and interpreted by a computational chemistry approach and experimental studies. Molecular dynamic simulations and Ab initio frontier orbital analysis indicated relatively high energy and electron transfer processes during adsorption, and molecular dynamics simulations showed CV dye molecules moving around on the activated carbon surface after adsorption, facilitating penetration into cracks and pores. The experimental results supported to molecular dynamic simulation and showed that the monolayer coverage occurred on the activated carbon surface and each CV dye ion had equal sorption activation energy.Öğe Dye Adsorption on Expanding Three-Layer Clays(Scrivener Publishing Llc, 2015) Depci, Tolga; Celik, Mehmet S.Many dyes that are used in the textile industry are toxic and tend to accumulate in living organisms directly or indirectly, causing various diseases and disorders. Clay minerals have recently been shown to be good candidates as dye adsorbents for wastewater treatment. This review discusses the use of both natural and modified three-layer clays such as bentonite, montmorillonite, and vermiculite to remove both cationic and anionic dyes. The most important parameters governing adsorption capacities are pH, ionic strength, and modification processes. Specific surface area is somewhat less important. Modification processes include thermal activation, acid activation, surfactant addition, and combinations of these, all of which increase adsorption capacities. Adjusting the pH changes both adsorbent surface properties and adsorbate dye ionization.Öğe Identification of chrysotile in local soil at Beypinari village (Sivas-Turkey) regarding mine and health issue(Springer India, 2016) Onal, Yunus; Depci, Tolga; Onal, Ayten; Onal, Ali; Uner, TijenAsbestos is dangerous for health and is forbidden to use in Turkey, but villagers who live in rural eastern part still use it especially for their home for insulation purposes and even as a substitute for baby powder. Therefore, geological and chemical properties of this type of soil, which is near the settlement, should be characterized and identified from the point of view of health. Beypinari asbestos deposits are located at Beypinari village, about 90 km southeast of Sivas, Turkey within Central Anatolian Ophiolites. Therefore, in the present study, the existence of chrysotile in Beypinari asbestos deposit were characterized and identified by mineralogical analysis and by major, trace, REE analysis. The results show that the samples contain different amount of calcite mineral, the main mineral being chrysotile.Öğe Influence of Microwave Heating and Thermal Auxiliary on Decomposition of Siderite(Iop Publishing Ltd, 2016) Celikdemir, Mehmet; Sarikaya, Musa; Depci, Tolga; Aydogmus, RamazanIn the present study, microwave radiation was used to decrease power inputs and roasting duration time for thermal decomposition of Deveci, Hekimhan siderite ore. The siderite was not enough to absorb adequate microwave radiation to start the decomposition or roasting reaction. Therefore, sucrose as a thermal auxiliary was added to the raw siderite ore before microwave irradiation. The effect of amount of sucrose (10 to 30 % by weight) against the duration of heating and roasting temperature of the thermal decomposition of siderite was investigated in the present study. On the contrary of the literature, the experimental results showed that the siderite was decomposed in 3 minutes with addition of 30 wt % sucrose and transformed to Fe3O4. The temperature, the weight loss and the magnetic susceptibility of the roasted final product were recorded as 1100 degrees C, 32.14 wt.% and 15410.03*10(-8) m(3)/kg., respectively.Öğe Investigation of electrochemical performance of Na-ion batteries by hard carbon anodes produced by biomass of Prunusarmeniaca seeds(Springer, 2023) Oktay, Zeynep Melek; Onal, Yunus; Depci, Tolga; Altundag, Sebahat; Altin, Serdar; Yasar, Sedat; Altin, EmineHard carbon is successfully fabricated using biomass of Prunusarmeniaca seed shells, and its structural properties are examined by different spectroscopic techniques. For using as an anode electrode in Na-ion batteries, the material is subjected to further pyrolysis at varying temperatures for achieving the necessary levels of conductivity and surface area which are important features for electrode materials. Distinguish properties of the hard carbon in the XRD study appeared as broad peaks at 2 & theta; = 23 & DEG; and 43 & DEG;. The purity of produced hard carbons was approved by EDX to analyze that the purity of hard carbon is greater than 99.9%, making it suitable for industrial use. It was found that the CV curves of the cells created in this work utilizing hard carbon were quite comparable to the CV curves of commercially produced hard carbon cells. According to charge/discharge cycling measurements for constant current at rt, the highest capacity of 210.2 mAh/g using 0.1 A/g is obtained for the material pyrolyzed at 1200 & DEG;C and the capacity fade was found as 0.11. From these promising results, it is thought that the produced hard carbon can be easily used in the production of anode electrodes in commercial Na-ion batteries and technological applications. So it is summarized that P. armeniaca seed shells is one of the main sources for the production of the hard carbon and it can be used as an anode materials in battery cells.Öğe Liquefaction Potential of Adiyaman Peat(Iop Publishing Ltd, 2016) Karaca, Huseyin; Depci, Tolga; Karta, Mesut; Coskun, M. AliIn the present study, liquefaction potential of Adiyaman peat was studied by direct liquefaction technique to obtain oil as a fuel purposes due to its high carbon and hydrogen content and low sulphur ratio. The peat and liquefaction products, named char, asphaltene, preasphaltene and oil, were characterized by XRD, FTIR, SEM, DTA/TG and elemental analysis. The compositions of the obtained oil were also identified by GC/MS. The results indicated that the obtained oil was paraffinic-low waxy oil with 21.73 MJ/kg of calorific value and 0.93 g/cm(3) density and it was composed of naphthalene and phenolic groups. The oil conversion ratio was found to be 29 %.Öğe Malatya Ovası'ndaki (Koyunoğlu-Çilesiz-Karakavak) alüvyal zeminlerin jeo-mühendislik özellikleri(İnönü Üniversitesi, 2002) Depci, TolgaÖZET Yüksek Lisans Tezi MALATYA OVASINDAKİ (KOYUNOĞLU-ÇİLESİZ-KARAKAVAK) ALÜVYAL ZEMİNLERİN JEO-MÜHENDİSLİK ÖZELLİKLERİ Tolga DEPCİ İnönü Üniversitesi Fen Bilimleri Enstitüsü Maden Mühendisliği Anabilim Dalı 109 + ix Sayfa 2002 Danışman : Yrd. Doç.Dr. Ayten ÖNAL Yardımcı Danışman : Yrd. Doç.Dr. Murat KARAKUŞ Bu çalışma Türkiyenin doğusunda yer alan Malatya Ovasındaki alüvyal zeminlerin jeolojik ve jeomühendislik özelliklerinin araştırılması ve incelenmesi amacıyla yapılmıştır. Malatya Ovası formasyonu bölgede güneyden kuzeye doğru şu anda aktif olmayan akmış nehirlerden kaynaklanan allüvyal çökeller ile kaplıdır. Bu çökeller Kuvaterner yaşlı olup üst seviyeleri çakıllı, alt seviyeleri ise siltli killi zeminleri içermektedir. Çökellerin kalınlığı bölgede farklılık göstermektedir. Bu çökellerin altında Neojen yaşlı Beylerderesi formasyonu vardır. Ova güneyde Yapraklı formasyonu ile sınırlıdır. Bölgenin kuzey kesimlerinde akifer birimler yer almakta olup, bundan dolayı genellikle tarımsal amaçlı kullanılmaktadır. Araştırılan bölge yeni binaların inşaasının yapılması için cazibe kazanmıştır. Bu bölgede binaların inşaatına talep hala artmaktadır. Bu inşaatlar genel olarak siltli killi zeminler üzerine yapılmaktadır. Bu yüzden bölgedeki alüvyal zeminin (Koyunoğlu, Çilesiz, Karakavak lokasyonları) fiziksel, mineralojik ve jeo-mühendislik özelliklerini ortaya koyabilmek için detaylı bir araştırmaya tabi tutulmuştur. Böylelikle; araştırma bulguları binaların hasar değerlendirilmesinde kullanılabilir. Laboratuar deneyleri için 9 adet örselenmemiş ve 6 adet örselenmiş zemin örneği alınmıştır. Bu örneklerin zemin mekaniği laboratuarında, zeminin indeks özellikleri, konsolidasyon ve şişme potansiyelleri, serbest basınç dayanımı ile zeminin mineralojik bileşiminin belirlenmesi için XRD analizlerine tabi tutulmuştur. Sonuçta araştırma bulguları zeminin mineralojik yapısının kil + kalsit + kuvars ve feldispattan oluştuğu göstermiştir. İndeks özelliklerine göre zemin kuru, katı-yan katı grubunda olup orta plastik özelliğe sahiptir. Konsolidasyon deney sonuçlan ise zeminin aşın konsolide ve orta şişme potansiyeline sahip olduğunu göstermiştir. ANAHTAR KELİMLER: Allüvyal zemin, mineraloji, indeks özellikler, Atterberg limitleri, konsolidasyon, şişme, Malatya OvasıÖğe Mineralogical and Chemical Characterization of Acidic Pumices Outcrop North of Lake Van(Iop Publishing Ltd, 2016) Yucel, Aysegul; Efe, Tugba; Onal, Mehmet; Depci, Tolga; Aydin, HarunIn the present study, mineralogical, physical and chemical characteristics of the pumice located in North of Lake Van locations were investigated to find an applicability of them for cement and textile industry. Characterization studies of the pumice samples were carried out by thin section, SEM, XRF, XRD and FTIR analysis. In addition, the bulk density, Hard Grove Index (HGI), pozzolanic activity and reactive silica of the pumice samples were determined. The overall results showed that the pumice samples, which might be an eruption product of Mount Suphan, had an amorphous structure and rhyolite composition in high calcalkaline series. The chemical compositions and physical properties indicated that the pumice samples could be used in cement and textile industry.Öğe New lightweight colemanite-added perlite brick and comparison of its physicomechanical properties with other commercial lightweight materials(Elsevier Sci Ltd, 2014) Celik, Atila Gurhan; Depci, Tolga; Kilic, Ahmet MahmutLightweight bricks can be produced by mixing the expanded perlite, CMC, coal dust and water. However, it may not achieve some of the physicomechanical properties. Therefore, colemanite is chosen in the present study to obtain lightweight bricks with high strength, heat and sound insulating and neutron shielding properties in the field of construction. The bricks were prepared by using different amount of colemanite (0-20% by weight) at different temperatures (200-400 degrees C). Optimum physicomechanical property of the brick was obtained after the heat treatment at 400 degrees C when 10% colemanite was added into the brick. Its physicomechanical properties (compressive strength, point loading index, unit weight, ultrasonic transit speed, water adsorption, porosity, heat and sound conductivity and sound insulation and neutron shielding effectiveness) were compared with the commercial lightweight construction bricks (normal brick, sandwich brick, gas concrete and pumice block). Our results indicated that brick studied in this article had better physical properties than the other construction bricks. (C) 2014 Elsevier Ltd. All rights reserved.Öğe A new statistical physics model to interpret the binary adsorption isotherms of lead and zinc on activated carbon(Elsevier Science Bv, 2016) Sellaoui, Lotfi; Depci, Tolga; Kul, Ali Riza; Knani, Salah; Ben Lamine, AbdelmottalebNew statistical physicochemical interpretations of an adsorption process at molecular level were developed to explain the binary adsorption isotherms of lead and zinc ions on activated carbon derived from Styrax officinalis seeds (Balikesir, Turkey) and a commercial activated carbon at different temperatures, 298, 308 and 318 K. The extended Hill model was developed to explain heterogeneous model in terms of the grand canonical ensemble in statistical physics. Steric and energetic parameters, like the numbers of ions per site n(1) and n(2), the densities of receptor sites N-M1 and N-M2 and the adsorption energies (-epsilon(1)) and (-epsilon(2)) were directly obtained from the fitting of the experimental adsorption isotherms by numerical simulation to describe the process. The simulation results suggested that two adsorbates per site were anchored on activated carbon surface. The magnitudes of the calculated adsorption energies indicated that Zn2+ and Pb2+ were physically adsorbed by the activated carbon. Thermodynamic potential functions, namely entropy, enthalpy and internal energy were calculated to explain the order and disorder of the adsorbate at the adsorbent surface during the binary adsorption process. The values of the free enthalpy and the internal energy indicated spontaneous adsorption process. (C) 2015 Elsevier B.V. All rights reserved.Öğe Optimization of Electrochemical Presodiation Parameters of Na-Ion Full Cells for Stable Solid-Electrolyte Interface Formation: Hard Carbon Rods from Waste Firefighter Suits(Wiley-V C H Verlag Gmbh, 2023) Yalman, Emine; Altundag, Sebahat; Aydin, Mustafa Goktan; Onal, Yunus; Depci, Tolga; Tekbas, Hasan; Bulut, FatihUtilizing the synthetic waste of firefighter costumes, rod-shaped hard carbon materials are effectively produced for the first time with over 99% purity, and their structural properties are evaluated using the appropriate spectroscopic techniques. The galvanostatic cycling tests are performed at different temperatures and the result shows that the capacity and capacity fade values are directly affected by the temperature. The high-rate consumption of sodium ions during the evolution of the solid-electrolyte interface in the first cycle of the cells is observed and the highest capacity of the half cells is obtained as 410 and 233 mAh g(-1) for the first and second cycles, respectively. To compensate for the sodium-ion loss, an electrochemical treatment presodiation technique is implemented, which is an effective means of compensating for the initial inefficiency. The optimum presodiation condition of electrochemical treatment of anode electrode for the production of Na0.67Mn0.5Fe0.45Ti0.07O2/presodiated hard carbon full cells is investigated. The highest capacity values for C/10 are obtained at 114.9 mAh g(-1) for the full cells using the voltage window of 2-4 V. The cost analysis of the battery pack for 90 kW electric-powered cars is calculated by the BatPaC software and the results are evaluated for possible commercialization.Öğe Orduzu (Malatya) volkanitleri'nin mermer ve yapıtaşı olarak kullanılabilirliği(Geosound, 2005) Önal, Ayten; Eren, Didem; Önal, Ali; Depci, TolgaÖz: Orduzu volkanitleri Malatya'nın kuzeydoğusunda bulunmakta olup, yaklaşık 4 km2-lik. bir alan kaplamaktadır. Bu volkanitler riyolit, dasit, bazaltik andezit ve bazalt olmak üzere dört farklı kaya biriminden oluşmaktadır. Riyolit ve bazaltik andezit lav akıntıları, dasit ve bazaltlar ise dayklar şeklinde oluşmuştur. Bazaltik andezitler ayrışmış olduklarından blok örnek alınamamıştır. Bu nedenle riyolit, dasit ve bazalt biriminin fizikomekanik özelliklerini belirlemek amacıyla, ISRM tarafından önerilen metotlara ve TSE standartlarına göre, mineralojik-petrografik, kimyasal, fiziksel ve mekanik özellikleri incelenmiştir, incelemeler sonucunda Orduzu volkanitlerine ait bu kayaçların TSE standartlarına göre alt sınır değerleri üzerinde olduklarından yapı elemanları, döşeme ve kaplamalarda güvenli bir şekilde kullanılabileceği belirlenmiştir. Başlık (İngilizce): Utilization as marble and cut-stone of Orduzu volcanics Öz (İngilizce): Orduzu volcanics located at northeast of Malatya covers an area of approximately 4 km2 .These volcanics composed of four different rock units such as rhyolite, dacite, basaltic andesite and basalt. The rhyolite and basaltic andesite have formed as lava flows, but the dacites and the basalts formed as dykes. The block samples were not taken from the basaltic andesite due to weathering. For this reason, mineralogical-petrographycal, chemical, physical and mechanical characteristics of the rhyolite, dacite and basalt were examined to determine their physico-mechanical characteristics according to ISRM suggested metethods and TSE standarts. As a result, these rock units from the Orduzu volcanics can be used as natural building materials, floor and covering in a safety since these rocks are above the limit values according to TSE standarts.Öğe Production of Nano Amorphous SiO2 from Malatya Pyrophyllite(Iop Publishing Ltd, 2016) Sarikaya, Musa; Depci, Tolga; Aydogmus, Ramazan; Yucel, Aysegul; Kizilkaya, NilgunPyrophyllite (Al4Si8O20(OH)(4)) is an important industrial clay mineral. In this paper, highly pure nano silica powder was synthesized by alkaline treatment method from the local pyrophyllite deposit which is in Malatya, Turkey. The morphologies, structures and properties of the raw pyrophyllite and the obtained nano amorphous SiO2 were determined by XRF, XRD, ATR, SEM and EDX. The results showed that the nano silica can be produced with a high purity (98%) and nano size (< 50 nm).
