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.

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.

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In the present study, calcium peroxide (CaO2) was used separately for potential application as an environmentally friendly and low-cost oxidant for the removal of a textile dye ‘Reactive Black 5’ (RB5) from simulated textile wastewater containing auxiliary chemicals of textile production. The specific morphology, elemental analysis, particle size distribution, specific surface area, identification of crystalline phases and surface functional groups of the synthesized CaO2 were investigated by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), laser diffraction (LD), Brunaure–Emmett–Teller method (BET), X-ray diffraction (XRD) and Fourier transmission infrared (FTIR), respectively. X-ray Diffraction analysis confirmed the synthesized oxidant as CaO2 with the tetragonal crystalline structure. The signal corresponded to a bending vibration of O–Ca–O was detected in the fingerprint region of the FTIR spectroscopy. The effects of various independent parameters such as contact time, pH, initial RB5 concentration and CaO2 dosage on decolorization were investigated. The results of the study showed that pH, initial dye concentration and the CaO2 amounts have significant effects on removal of the RB5. The optimum pH was determined 7 for the removal of RB5 by CaO2. 2.0 g CaO2 was found to be sufficient for the removal of 300 mg/L RB5 with 96.93% removal efficiency. Also 82.8% chemical oxygen demand (COD) removal efficiency from simulated textile wastewater (STW) was obtained by 2.0 g CaO2. The results of the present study showed that the CaO2 can be used as an environmentally friendly and low-cost oxidant for effective removal of reactive textile dyes.

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