Advancing risk assessment of engineered nanomaterials: application of computational approaches

Carbon nanotube dispersion in nematic liquid crystals: An overview

This work describes the assessment of a selection of fullerenes including C60 and C70 fullerene, N-methylfulleropyrrolidine, C60 pyrrolidine tris-acid ethyl ester, [6,6]-Phenyl-C61 butyric acid butyl ester and [6,6]-Thienyl C61 butyric acid methyl ester, in airborne particulate from the Mediterranean Sea collected during two sampling campaigns from Barcelona to Istanbul and Alexandria, respectively. The analysis of the samples was carried out using a new method based on liquid chromatography coupled to mass spectrometry (LC-MS) presenting sensitivities between 5.4 and 20.9 pg/m3. A total number of 43 samples covering the different basins of Mediterranean Sea were analyzed. Fullerenes were detected in all analyzed samples and quantifiable concentrations were found in 28 of the analyzed samples. The median of C60 and C70 fullerenes aerosol phase concentrations were 0.06 ng/m3 and 0.48 ng/m3 respectively for the Mediterranean Sea atmosphere. C70 fullerene was the most frequently detected compound and also it...

Occurrence of aerosol-bound fullerenes in the Mediterranean Sea atmosphere.

Valorisation of nuts biowaste: Prospects in sustainable bio(nano)catalysts and environmental applications

Microwave pyrolysis for valorisation of horse manure biowaste

In this study, pyrolysis of pine cone, a lignocellulosic biomass, was carried out in a fixed bed reactor. The biochar product obtained was activated by using chemical activation method. KOH was used as the activating agent with the impregnation ratio was ¼. Activated pine cone biochars were characterized by using analysis techniques such as SEM, BET, and FT-IR. The usage potential of the activated biochar product with a surface area of 1714.5 m2/g has been investigated in two different application areas. As the first application area, the CO2 holding capacity of activated biochar was measured by using the thermogravimetric analysis method. The CO2 adsorption capacity of the activated biochar was determined as 160 mg/g (3.64 mmol/g) at 25 °C. As a second application area, the effectiveness of activated biochar product in the removal of dyestuff (methyl orange) from aqueous solutions was investigated. The methyl orange adsorption capacity of the activated biochar in optimum conditions (pH 2, temperature of 25 °C, initial concentration of 100 mg/L, adsorbent amount 0.8 g/L) was calculated as 109.5 mg/g. Isotherm modeling and kinetic investigations showed that Freundlich and pseudo-second-order models describe the adsorption equilibrium and kinetic behavior well. As a result, this type of biomass could be successfully evaluated in removing both methyl orange dye, which is a potential pollution risk for aquatic environment, and CO2 that is responsible for climate change and greenhouse effect in the atmosphere.

Investigation of effectiveness of pine cone biochar activated with KOH for methyl orange adsorption and CO2 capture

Pyrolysis and optimization of chicken manure wastes in fluidized bed reactor: CO2 capture in activated bio-chars

At the first part of this work, three different textile dyes (disperse orange 11, 13 and 37) were separately doped (1% w/w) to the nematic liquid crystal (E7). Single‐walled nanotube and fullerene C60 in a small amount (0.05% w/w) were mixed to these solutions at the second stage. Order parameters, threshold voltages, textures and clearing temperatures for all of mixtures were determined. Co‐use of dyes and nanoparticles as dopant was resulted in notable increases in order parameters. While threshold voltages required for the change of order parameter decreased, an important change in the texture and clearing temperature of the liquid crystal was not observed.

Phase Transitions, Order Parameters and Threshold Voltages in Liquid Crystal Systems Doped with Disperse Orange Dye and Carbon Nanoparticles

In this study, hazelnut shell and walnut shell which are the agricultural wastes existent abundantly in many countries were pyrolyzed at different temperatures in the temperature range of 400–700 °...

Production and characterization of carbon-based adsorbents from waste lignocellulosic biomass: their effectiveness in heavy metal removal

One of the major pollutants in water resources are organic dyes that are widely used by different industries Methylene blue (MB) is one of them which is quite harmful for aquatic life This pollutant must be removed with proper methods Adsorption is one of the most popular methods because of its high purification yield and known as a cost effective process if the sorbent is inexpensive In this study, biochar which is used as an adsorbent has been produced from hazelnut shells used as the raw material Chemical, thermal and surface characteristics of raw hazelnut shell were investigated by FT-IR, TG/DTG, SEM and elemental analysis Biochar characteristics were determined by FT-IR, BET and SEM analysis The effect of different adsorption parameters such as pH, initial dye concentration, contact time, adsorbent dosage and temperature on the adsorption of MB onto hazelnut shell char were examined in batch experiments The equilibrium of adsorption was modeled using Langmuir and Freundlich isotherm models The maximum adsorption yield of MB was found to be 83% at pH 40, adsorbent dosage of 4 g/L, contact time of 300 min, initial dye concentration of 15 mg/L and temperature of 45 o C In addition, the Freundlich isotherm was found to be the best fitting isotherm model for the adsorption process The pseudo-first-order and pseudo-second-order kinetic models were applied to the experimental data and thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined

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Nihan Kaya

Papers

Investigation of effectiveness of pine cone biochar activated with KOH for methyl orange adsorption and CO2 capture

Pyrolysis and optimization of chicken manure wastes in fluidized bed reactor: CO2 capture in activated bio-chars

Phase Transitions, Order Parameters and Threshold Voltages in Liquid Crystal Systems Doped with Disperse Orange Dye and Carbon Nanoparticles

Production and characterization of carbon-based adsorbents from waste lignocellulosic biomass: their effectiveness in heavy metal removal

Preparation and Characterisation of Biochar from Hazelnut Shell and Its Adsorption Properties for Methylene Blue Dye