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In the present study, Eucalyptus camaldulensis bark/magnetite composite (EBMC) was used for a potential application as a low-cost adsorbent for the removal of Reactive Black 5 (RB5). The adsorption experiments were performed with aqueous solution (RB5 + distilled water) and synthetic dye bath wastewater (SDBW) in order to investigate the potential application of EBMC in the textile industry. The effects of the various parameters, the initial dye concentration, the temperature, the pH, and the EBMC dosage on the adsorption were investigated. It was found that the adsorption capacity of EBMC increases by increasing the RB5 concentration and temperature and by decreasing the dosage of EBMC. 0.8 g EBMC was found to be sufficient for the removal of 250 mg/L RB5 from 150 mL SDBW with ∼85% removal efficiency. The Koble-Corrigan isotherm model described the adsorption process more effectively (R = 0.997) than the Langmuir, Freundlich, the Dubinin-Radushkevich and the Jovanovic isotherm models. The Langmuir isotherm predicted a 370.7 mg/g maximum adsorption capacity. The thermodynamic analysis showed that the adsorption of RB5 onto the EBMC was an endothermic process. The multiple linear regression analysis was used in order to determine the cumulative effects of independent variables on the adsorption capacity.

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The aim of this work is to evaluate decolorization of Reactive Black 39 (RB39) and Acid Red 360 (AR360) by Pseudomonas aeruginosa, which was isolated from a non-dye-contaminated activated sludge biomass. In the present study, the effect of various physicochemical parameters, initial dye concentration, temperature, pH, inoculum size and yeast extract concentration as an organic source on decolorization were investigated. P. aeruginosa was able to decolorize 20 mg/L RB39 completely within 144 hours in the presence of 0.5 g/L yeast extract at 25°C. Decolorization efficiencies for AR360 were found to be higher than RB39 under the same conditions. Optimal temperature to decolorize RB39 and AR360 was found to be 30 and 25°C, respectively. The activation energy (Ea) values for decolorization of RB39 and AR360 were found to be 61.89 kJ/mol and 81.18 kJ/mol, respectively. Experience showed that the pH and inoculum size had a considerable effect on decolorization of RB39 and AR360 by P. aeruginosa.

In this study, batch experiments were carried out to investigate simultaneous growth of Spirulina platensis and removal of hardness in the Van Lake Water (VLW). Laboratoryscale studies showed ample Spirulina growth observed in VLW when exposed to light. Spirulina was the only algal specimen inoculated in the water during the study. VLW percentages were varied between 0.1 and 100% while pH values were 8.7-10.42 in the flasks. On a dry-weight basis the biomass concentration was 1.18 g L À1 at pH 10 after 17 days of incubation in the VLW. The increase of pH to above 10.38 associated with Spirulina growth resulted in the precipitation of hardness causing compounds while providing 70% hardness removal from the VLW medium. Experimental results indicated that the proposed method can be used to design batch systems for producing S. platensis and removal of hardness from the VLW.

In the present study, Eucalyptus camaldulensis bark/magnetite composite was used for potential application as a low-cost adsorbent for the removal Bisphenol-A. The effects of various independent parameters, contact time, initial Bisphenol-A concentration, temperature, pH, and Eucalyptus camaldulensis bark/magnetite composite dosage on adsorption were investigated. It was found that the adsorption capacity of Eucalyptus camaldulensis bark/magnetite composite increases with the increasing of Bisphenol-A concentration, temperature, and decreasing dosage of Eucalyptus camaldulensis bark/magnetite composite. The adsorption capacity was found to be 290.6 mg/g with 0.1 g Eucalyptus camaldulensis bark/magnetite composite at pH 7 and 50 C. The Freundlich isotherm model described the adsorption process better (R 2 ¼ 0.998) than the Langmuir, Dubinin-Radushkevich, Jovanovic, and Vieth-Sladek isotherm models. According to multiple linear regression analysis, Eucalyptus camaldulensis bark/magnetite composite dosage is the most effective parameter on adsorption capacity at equilibrium and independent variables accounted for 79.4% of the total variability of equilibrium adsorption capacity of Eucalyptus camaldulensis bark/magnetite composite.

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ÖzBu çalışmada yüzeyi nano manyetit ile kaplanmış Eucalyptus camaldulensis kabukları (NEK), bir tekstil boyar maddesi olan Reaktif Black 39"un (RB39) distile su ve sentetik atıksudan gideriminde düşük maliyetli bir adsorbent olarak kullanılmıştır. Adsorpsiyon üzerine temas zamanı, pH, sıcaklık NEK dozu ve başlangıç boyar madde konsantrasyonu gibi çeşitli parametrelerin etkisi araştırılmıştır. Çalışmalar NEK"in adsorpsiyon kapasitesinin başlangıç boyar madde konsantrasyonunun, pH"ın ve sıcaklığın artmasıyla arttığını, NEK dozunun artmasıyla azaldığını göstermiştir. 300 mg/L RB39"un 150 mL distile sudan yaklaşık %94 verimle giderilmesi için 0,2 g NEK yeterli olduğu tespit edilmiştir. Diğer taraftan 300 mg/L RB39"un sentetik atıksudan yaklaşık %92 verimle giderilmesi için 0,4 g NEK"in yeterli olduğu bulunmuştur. Freundlich izotermi (R 2 =0,993) adsorpsiyon sürecini Langmuir izotermine göre daha etkili bir şekilde açıklamıştır. Langmuir izotermi NEK"in maksimum adsorpsiyon kapasitesini 432,12 mg/g olarak tahmin etmiştir. Anahtar Kelimeler: Adsorpsiyon, Eucalyptus camaldulensis, Manyetit Removal of Reactive Black 39 Dye from Distilled Water and Synthetic Wastewater by a Nano Adsorbent AbstractIn the present study, nano magnetite coated Eucalyptus camaldulensis barks (NEC) was used as a lowcost adsorbent for the removal of a textile dye Reactive Black 39 (RB39) from distilled water and synthetic wastewater. The effects of the various parameters, contact time, pH, temperature, NEC dosage and initial dye concentration on the adsorption were investigated. It was found that the adsorption capacity of NEC increases by increasing the RB39 concentration, pH and temperature and by decreasing the dosage of NEC. 0.2 g NEC was found to be sufficient for the removal of 300 mg/L RB39 from 150 mL distilled water with ∼94 % removal efficiency. On the other hand 0.4 g NEC was found sufficient for the removal of RB39 from synthetic wastewater with ∼92 % removal efficiency. The Freundlich isotherm model described the adsorption process more effectively (R 2 = 0.993) than the Langmuir isotherm model. The Langmuir isotherm predicted a 432.12 mg/g maximum adsorption capacity of NEC.