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The photodegradation ofOrangeI was performed to evaluate the photocatalytic activitiesof the prepared -Fe2O3 powders. All photoreactionexperiments were carried out in a photochemical reactorsystem. The system consisted of a Pyrex cylindrical reactorvessel with an effective volume of 250mL, a cooling waterjacket, two aeration inlets in the bottom, and an 8W UVAlamp (Luzchem Research, Inc.) with the main emission at365 nm or a 70W high-pressure sodium lamp (LuzchemResearch, Inc.) with the main emission in the range of 400-800 nm positioned axially at the center as the UV or visiblelight source. The reaction temperature was kept at 25 ± 1?Cby cooling water, and the reaction suspension was constantlystirred by placing the reactor on a magnetic stir plate duringthe reaction process. The reaction suspension was preparedby adding doses of 0.4 g/L -Fe2O3 powder into 250mL of a20 mg/L aqueous <strong>[523-44-4]Orange I</strong> solution. Prior to photoreaction,the suspension was magnetically stirred in the dark for30 min to establish an adsorption/desorption equilibriumstatus.The aqueous reaction suspension was then irradiatedunder UVA light with constant aeration. At given timeintervals, analytical samples were taken from the suspensionand immediately centrifuged at 4500 rpm for 20min. Thesupernatant was carefully transferred and stored in the darkfor the analysis of the remaining <strong>[523-44-4]Orange I</strong> at the wavelengthof 481 nmon aUV-Vis spectrometer.The total organic carbon(TOC) concentration was determined by a total organiccarbon analyzer (Shimadzu TOC-V CPH, Japan). All of theexperiments were carried out in triplicate, and the meanvalues were reported and used to calculate the rate constants.
With hydrogenchloride; Mg0.73Zn0.22Ca0.05; In water; at 24.84℃;pH 2.0;UV-irradiation;Kinetics;
Fixing other reaction conditions, we investigated the degradation performance of AO II solution of three Mg-based ribbons after immersion for different timm, as shown in Fig.7 . The normalized concentration Ct/C0 curves of Mg, MZ and MZC ribbons at different timm are shown in Fig.7(a), (b) and (c), respectively, which are inset with the ln (C0/Ct) vs. time curves. When timm increases from 0 to 5h, the residual AO II concentration Ct/C0 by Mg ribbon gradually decreases (Fig.7(a)). As timm increases from 0 to 1h (Fig.7(b)), the residual AO II concentration Ct/C0 by MZ ribbon gradually decreases, but it increases slightly as timm increases from 1 to 5h. The degrading behavior of MZC ribbon against AO II solution with increasing timm is shown in Fig.7(c), being similar to Mg ribbon.
All UV-vis experiments were performed in H2O solution by adding aliquots stock solution of respective dyes. The stoichiometry of the complexes was determined by the Job method of continuous variations. The association constant was calculated by Benesi-Hilderbrand formula with nonlinear curve fitting procedure.[32]
All UV-vis experiments were performed in H2O solution by adding aliquots stock solution of respective dyes. The stoichiometry of the complexes was determined by the Job method of continuous variations. The association constant was calculated by Benesi-Hilderbrand formula with nonlinear curve fitting procedure.[32]
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