1,720,986 research outputs found
Fe3O4@Granite: A Novel Magnetic Adsorbent for Dye Adsorption
No full textMagnetic granite (MG), a new and low-cost adsorbent, was prepared by the chemical co-precipitation of Fe2+ and Fe3+ using granite (G), which is a magmatic rock type. The adsorption of the Reactive Black 5 (RB5) dye from aqueous solutions on Fe3O4-modified granite was examined in a batch system. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-ray fluorescence spectrometry (XRF), X-ray diffractometry (XRD), N2 adsorption–desorption, vibrating-sample magnetometry (VSM), and point-of-zero charge (pHpzc) analysis were used to characterize the prepared MG. Magnetic granite displayed significant magnetization and could be easily separated using external magnets. The maximum adsorption capacity was 29.85 mg/g at 298 K. According to kinetic and isothermal examinations, the pseudo-second-order model and Langmuir isothermal adsorption were the best fit for adsorption. It was found that the enthalpy change ΔH (kJ/mol) was −31.76, and the entropy change ΔS (kJ/mol) was 0.096 for a temperature change of 298–330 K. The ΔG° (kJ/mol) value was negative at all temperatures (298 K, −2.86 kJ/mol; 303 K, −2.85 kJ/mol and 313 K, −1.50 kJ/mol), indicating that the adsorption of RB5 on MG was spontaneous
Degradation of phenol and 4-chlorophenol from aqueous solution by Fenton, photo-Fenton, sono-Fenton, and sono-photo-Fenton methods
No full textIn this study, the effects of Fenton process (FP), photo-Fenton process (P-FP), sono-Fenton process (S-FP), and sono-photo-Fenton process (S-P-FP) for the degradation of phenol and 4 chlorophenol (4-CP) from aqueous solution were evaluated. The effects of reaction time, initial concentration, initial pH and Fenton reagent dosages on degradation were investigated. UV-A, UV-B, and UV-C light were used as ultraviolet (UV) light source. In the study with the addition of ultrasound (US), ultrasound with a frequency of 40 kHz and a power of 180 watts was used. While the phenol degradation efficiency was 95% in FP, it reached 99% in P-FP, S-FP and S-P-FP. The 4-CP degradation efficiency was 55.3% in FP, 64.1% in P-FP with UVA, 70% in S-FP and 99% in S-P-FP. This study is especially important in terms of revealing the synergistic effect of different processes in an integrated reactor
Green Synthesis of CuO Nanoparticles Using Tragopogon porrifolius and Their Antioxidant and Photocatalytic Applications
No full textCopper oxide nanoparticles (CuO NPs) were produced by green synthesis method which is a cheap, easy and effective method using Tragopogon porrifolius extract. The shape, bond and crystal structure of the nanoparticles were determined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffractometer (XRD) analysis methods. SEM analysis showed that the particles were spherical and EDX analysis showed the elemental composition of Cu and O as Cu 58.17 % and O 32.73 %. Cu-O bond structure was identified in FTIR analysis. In XRD analysis, peaks defining CuO NPs were observed. The antioxidant and photocatalytic activity of the synthesized CuO NPs were investigated. Antioxidant capacities were examined in the range of 50-500 ?g/mL. The free radical scavenging activity of the nanoparticles was determined as 70.75 % at a concentration of 500 ?g/mL. In photocatalytic studies, Reactive Red 120 (RR 120) dye degradation was investigated. The degradation time was calculated as 76 % in 30 min
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