Jale Gulen

• Professor (Associate) at Yıldız Technical University

Energy is a prime agency for economic liberty and sustainability. It can be supplied from fossil or renewable sources. Hydropower is a renewable energy source that generates electricity without emitting greenhouse gases. So, it possesses significant potential for replacing fossil fuel power plants and providing energy by reducing carbon-based energ...

Iron oxide (BHFeNP) and silver nanoparticles (BHAgNP) were produced using a green synthesis method through the extract of buckwheat husk (BH) waste to remove dye pollutants from water bodies in this study. The BHFeNP and BHAgNP were characterized by TEM, SEM, XRD, EDX, and FTIR techniques. Then, the methylene blue (MB) removal performance of the sy...

Perlite is an example of clayey type geologic mineral. Perlite is a cheap and abundant adsorbent and it can be used for versatile applications in food, pharmacy and chemistry industries. Perlite was chosen for the removal of penta chloro nitrobenzene (PCNB) pesticide. This pesticide is used for the control of fungi species in farming commonly. Adso...

Sumac Leaves ( Rhus Coriaria L ), were used as a possible adsorbent of Basic Blue 3 (BB3) removal. The main affecting parameters on adsorption such as concentration, pH and temperature were investigated. Adsorption equilibrium was reached in 30 min. The ultrasonic effect was also enhanced the dyestuff removal. Adsorption capacity was rised from 0.5...

In this research, biosynthesis of zinc oxide nanoparticles (ZnO-NPs) was performed using aqueous extract of the leaves of Cynara scolymus L (CsL, artichoke) plant. The synthesized CsLZnO-NPs were characterized by Ultraviolet-visible (UV-Vis) absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM),...

In this study, two Turkish lignites were tested under microwave and magnetic effects. The samples are belong to Nallıhan (Çayırhan) and Çan (Çanakkale) regions of Turkey. The proximate analyses of two lignites (fixed carbon, volatile matter, sulfur, ash, and moisture) were done, and the calorific values were also calculated. 185 W Microwave effect...

Sumac leaves (Rhus coriaria L.), was chosen as a friendly and low-cost adsorbent from the point of sustainable ecosystem. Basic red 46 is a cationic dye commonly used in the textile industry. The adsorbent was experienced according to the various parameters that are effective in the adsorption, and the adsorption was enlightened from the points of...

Issues related to food wastage have become a significant threat to sustainable development, particularly in developing countries. Cooked rice, reported as one of the abundant regional food wastes, is a...

DAP is a new, bio-inspired consolidant already proven to be useful for limestones. In this study, we investigate the effectiveness of DAP on four different types of Turkish stones; Ankara (andesite), Bitlis (andesite), Mardin (limestone) and Nevsehir (ignimbrite). The effectiveness was analysed by means of weight, water absorption, surface hardness...

In Asia, uneaten cooked rice is the highest portion amongst many forms of food wastes that are thrown away. In order to make use of the thrown-away rice and potentially use it for liquid fuels, steamed Japanese rice was evaluated on biobutanol production through a two-step fermentation by amylase-producing Aspergillus oryzae, and solvent-producing...

The activated carbon was made of carbonized chest nut shell (CCS) and used as low cost adsorbent for 2,4-D (2,4-dichlorophenoxyacetic acid) removal. The experiments were conducted at different temperatures such as 35, 45 and 55 °C and this system represents as L type adsorption behavior. The experimental data were modelled using several isotherm mo...

Carbonized peanut shell (CPS), a low cost adsorbent was investigated for adsorption of methylene blue from its aqueous solution. Some experimental parameters like the effect of initial dye concentration, initial solution pH, phases contact time and temperature were investigated. Langmuir, Freundlich and Harkins-Jura isotherm models were applied to...

Carbonized chestnut shell was investigated as a low cost adsorbent for the adsorption of methylene blue (MB) from aqueous solution. Some parameters like the effects of initial dye concentration, initial pH value of solution and contact time of phases were investigated. The equilibrium was attained in 120 minutes. The isotherm models of Langmuir, Fr...

Amitraz (AZ) that is used as acaricide was extracted by using clay adsorbent. The experimental data were modeled via Langmuir and Freundlich isotherms in which adsorption data fit well. The monolayer adsorption capacity was found as 28.53 mg × g⁻¹ at a temperature of 30 °C. The effects of the phases contact time, the initial solution pH value and t...

Sumac leaves (SL) (Rhus coriaria L.) were investigated as a low-cost and effective bioadsorbent for the adsorption of methylene blue (MB) from aqueous solution. In this study, the effects of initial dye concentration, initial solution pH, and phases contact time were investigated. The equilibrium was attained in half an hour. The Langmuir, Freundli...

The fossil properties can be increased via enrichment process. It is the process that removes sulfur and mineral matter without changing the organic structure. In this study, Çan lignite was demineralized with mineral acid of 5 % such as HNO3, HCOOH, H2SO4, HCl, H3PO4 and HF after 5 % NaOH washing. The best sulfur and mineral matter performed were...

This study was carried out on mostly imported, processed petrocokes, which are also commercially known as “petcoke” or “petroleum coke”. Petrocoke is imported in great amounts and is occasionally consumed domestically without conscientious thought. It is not a well-known material, though there is an idea of its genesis. The samples, their analysis,...

In the natural aquatic systems, sorption processes play a dominant role for pollutant among the other techniques such as ozonation, filtration, etc. Environmental pollution is a general problem all over the world. Several techniques can be appliled for removing of these undesired parts. The adsorption behaviour of organic contaminants such as pesti...

Turkey has huge lignite reserves although they have high ash, sulfur, and volatile matter. The direct usage of this fossil fuel has disadvantages such as fouling, acid rains, greenhouse gases (GHGs), etc. Greenhouse gases are the principal factor for global warming and climate change. Some gasification processes can be applied for turning coal into...

Demineralization of lignites from Nallihan, Turkey, was investigated using various aqueous acids, such as HCl, HNO3, and H2SO4, which were used at the concentrations of 5 and 10 vol%, hydrofluoric acid (HF) acid solutions of 5, 10, 20, 30, and 40 vol%. The experiments were done at 20, 40, 50, and 60°C temperatures in order to observe the heating ef...

Amitraz (AZ) that is used as acaridies was tried to extract with a clay. The experimental data were modelled as using Langmuir and Freundlich isotherms. The adsorption data fit well with Langmuir isotherm that indicated the AZ adsorption is homogeneous and monolayer. The monolayer adsorption capacity was found to be 35.02 mg/g at 20 ºC temperature....

Bu calismada Turkiye’deki 4 farkli komur numunesinin (Can, Saray, Tuncbilek, Yatagan) kimyasal, petrografik, isil ve yapisal ozellikleri incelenmistir. Komur numunelerine ait C, H, O, N, S gibi elementel analizleri ve ucucu madde, sabit karbon, kul gibi kisa analizleri saptanmistir. FTIR spektrumlari ile komur orneklerine ait yapisal ozellikleri ac...

The fossil properties can be increased via enrichment process. It is the process that removes sulfur and mineral matter without changing the organic structure. In this study, can lignite was demineralized with some mineral free acid of 5% such as HCOOH and some mineral acids of 5% such as HNO3, H2SO4, HCl, H3PO4 and HF after 5% NaOH washing. The be...

This study investigates the effects of the characteristic temperatures of the burning profile on the reactivity of 15 lignite samples originating from different areas of Turkey. Nonisothermal thermogravimetry has been used to determine the combustion reactivity of the samples. The combustion activation energies were calculated by the Coats Redferm...

Environmental problems associated with energy use consist of an increasing spectrum of pollutants, hazards, accidents, and degradation of environmental quality and natural ecology (Dincer, 1998). Climate change is threatening human beings on the world. Earthquakes, typhoons, cyclones, floods are the common natural disasters for all of us because of...

Fixed bed pyrolysis experiments have been conducted on waste cotton scrap materials for converting into fuel form. The effect of temperature on the pyrolysis experiments has been investigated at the temperatures of 250°C, 350°C, 500°C, 600°C, 700°C, 800°C, and 900°C. The maximum liquid amount (30%)was obtained at 500°C with 700 cm/min N2 sweep gas...

Fixed bed pyrolysis experiments have been conducted on waste cotton scrap materials for various process parameters. The effects of pyrolysis temperatures, well-swept gas atmospheres (N2), and heating rates on the pyrolysis process have been investigated. For this purpose, low (700 cm/min) and high (3,900 cm/min) N2 flow rates, low (5°C/min) and hig...

The adsorption kinetics of methylene blue on pyrolyzed petrified sediment (PPS) has been performed using a batch-adsorption technique. The effects of various experimental parameters, such as initial dye concentration, contact time, and temperature were investigated. The pseudo-first-order and pseudo-second-order kinetic models were used to describe...

In this present study, high mineral matter (ash) asphaltites from Silopi, Southeastern Anatolia, Turkey were investigated using aqueous sodium hydroxide followed by various mineral acids such as HNO3, HCl, H2SO4, and HF. The extraction with 5% NaOH followed by leaching with 10% H2SO4 plus 40% HF was the optimum approach for chemical cleaning of the...

Coals are heterogeneous, complex noncrystalline macromolecules having both organic and inorganic materials that contain some inorganic constituents. Some techniques have been applied to this fossil fuel in order to remove these undesired inorganic parts from the organic part. Chemical demineralization is one of the suitable methods for removal of i...

In the scope of this study, the combustion experiments were performed with CWSs prepared from Zonguldak bituminous coal, Soma semi bituminous coal and Istanbul - YenikÖy lignite coals in pilot type down fired coal combustor. The particle size and combustion ratio were kept as constant in the experiments. The coalification degree which play an impor...

The surface properties of fossil fuel show differences according to ranks and mineral matter content. The fossils that have high mineral matter content are treated with some applications before using. This is a kind of enrichment. This process is helpful to both economic and technological points of view. The mineral matter of fossil can be decrease...

The adsorption behavior of azinphosmethyl on pyrolyzed Horseshoe Crab (Limulus polyphemus) outer shell, as a residue, from the Atlantic Ocean, collected along the Maine coast, USA, has been studied with regards to its kinetic and equilibrium conditions, taking into account adsorbate concentrations of 2 x 10(-3), 4 x 10(-3), 6 x 10(-3), and 8 x 10(-...

In this study, the effects of particle size, moisture, briquetting pressure, and preheating temperature were investigated on briquetting without binder of Sırnak Asphaltite, having a particle size of—20 mm, 46.22% ash, 5.83% total sulphur content, and 4900 kcal/kg calorific value. At the end of the briquetting experiments; mechanical strength value...

Borogypsum, which consists mainly of gypsum crystals, B2O3 and some impurities, is formed during the production of boric acid from colemanite, which is an important borate ore. In this study, the effect of borogypsum and calcined borogypsum on the physical properties of ordinary Portland cement (OPC) has been investigated. The calcination temperatu...

A rapid growth is taking place in the use of implant material for the organs malfunctioning or injured. For this reason, search is done for material with physical and chemical resistance suitable for replacement of organs. In this study, the corrosion potential of Co-Cr-Mo alloy according to ASTM F75 at metallic implant quality was measured in open...

The various emissions formed after combustion is dependent upon to fuel consumption and the properties of combustion system. The combustion system design has been done according to the fuel type. The proper design and operation have been included the knowledge of the properties of fuel and combustion system as well as the analysis of the effects of...