Composite photocatalysts containing MIL-53(Fe) as a heterogeneous photo-Fenton catalyst for the decolorization of rhodamine B under visible light irradiation (original) (raw)
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Sustainability
In this study, a novel MIL-100(Fe)@TiO2 composite was synthesized and used as the adsorbent to remove Rhodamine B from synthetic wastewater through adsorption and photocatalytic degradation. The composite was synthesized successfully using solvothermal methods. MIL-100(Fe)@TiO2 composite has excellent adsorption and photodegradation capability for Rhodamine B removal. The reusability of the materials was observed, with the conclusion that the material still had good adsorption and photocatalytic performance after five cycles of consecutive experiments. The adsorption isotherm, kinetic, and thermodynamic studies of the removal of Rhodamine B were also conducted. The Langmuir model represented the adsorption equilibrium data better than other models. The kinetics of adsorption of Rhodamine B was presented well by pseudo-first-order. The thermodynamic study verified that the physisorption mechanism was more dominant than chemisorption. The addition of Fenton was also proven to be succe...
Photocatalytic Degradation of Rhodamine B in Heterogeneous and Homogeneous Systems
Hungarian Journal of Industry and Chemistry, 2021
This study focuses on the photocatalytic degradation of Rhodamine B (RhB) in heterogeneous and homogeneous photo-Fenton reactions. In the heterogeneous system, iron(II) doped copper ferrite CuII(x)FeII(1-x)FeIII2O4 nanoparticles (NPs) prepared in our previous work were employed as potential catalysts. The photodegradation of RhB was carried out in a quartz cuvette located in a diode array spectrometer. The experimental conditions such as pH, NPs dosage and H2O2 dosage with regard to the photocatalytic degradation of RhB were optimized to be 7.5, 500 mg/L and 8.9x10-2 mol/L, respectively. In addition, visible light-induced photodegradation of RhB was also carried out by using \ch{H2O2} over a wide pH range in the absence of heterogeneous photocatalysts. It was observed that the reaction rate significantly increased above pH 10, resulting in a faster rate of degradation of RhB, which may be attributed to the deprotonation of hydrogen peroxide. Furthermore, the potential antibacterial ...
This work aims to develop a highly efficient solar light-induced photocatalyst based on La˗Mn co-doped Fe2O3 nanoparticles. Pure Fe2O3 and La˗Mn co-doped Fe2O3 nanoparticles were fabricated by a simple co-precipitation method. The photocatalysts were analyzed for their morphological, structural, and magnetic characteristics. The photocatalytic performance of the Fe2O3, La0.1Mn0.3Fe1.60O3, and La0.2Mn0.2Fe1.60O3 catalysts was assessed by their capability to degrade Rhodamine B (RhB) under solar light illumination. La0.2Mn0.2Fe1.60O3 displayed exceptional degradation performance, degrading RhB to 91.78% in 240 min, in comparison to La0.1Mn0.3Fe1.60O3 (71.09%) and pristine Fe2O3 (58.21%) under specified reaction conditions [(RhB) = 50 ppm; (catalyst) = 40 mg/L; pH = 7; T = 25 ºC)]. The increased photocatalytic performance of La0.2Mn0.2Fe1.60O3 was attributed to the large surface area of the catalyst as a result of La˗Mn co-doping. RhB degradation was affected by changing pH, catalytic ...
A review on Parameters Affecting the Photocatalytic Degradation of Dyes using Photocatalysts
2013
Production of clean hydrogen energy and removal of environmental pollutants using photocatalysis technique have received a great deal of interest in recent few decades. Photocatalytic reaction catalyzed by semiconductors has been approved as a promising process for solving energy and environmental issues. This paper presents an overview of photocatalytic degradation of dyes in presence of UV light. We highlight here the effects of various parameters, such as the amount of the catalyst loading, initial concentrations of dye and pH along with the study of reaction mechanism of photocatalysis. A case study is examined which gives an overview of different operating parameters affecting the photocatalytic degradation of Rhodamine-B in aqueous solution with titanium dioxide (TiO 2 ) and niobium pentaoxide (Nb 2 O 5 ) as photocatalyst in slurry form has been carried out using UV-A light (254 nm). The effect of various parameters such as catalyst loading, pH and initial concentration of the RB dye on degradation is determined. The maximum rate of degradation was observed in acidic medium at pH 3 for catalyst TiO 2 and Nb 2 O 5 respectively. It was observed that the photocatalytic activity of TiO 2 is greater than Nb 2 O 5 .
ACS Omega, 2021
Magnetic CoFe 2 O 4 −gC 3 N 4 nanocomposites were successfully synthesized, and their photocatalytic activities toward the decomposition of model synthetic dyes (e.g., methylene blue, methyl orange, and Congo red) in the presence of H 2 O 2 were evaluated under simulated solar light irradiation. The 50CoFe 2 O 4 −50gC 3 N 4 nanocomposite exhibited the highest catalytic activity. The catalytic activity of 50CoFe 2 O 4 − 50gC 3 N 4 toward the photodegradation of some industrially used dyes (such as Drimaren Turquoise CL-B p, Drimaren Yellow CL-2R p, and Drimaren Red CL-5B p) was also examined, and the catalyst exhibited its capability to decompose the industrial dyes completely. An aqueous mixture of these dyes was prepared to mimic the dye-containing wastewater, which was fully photodegraded within 30 min. 50CoFe 2 O 4 −50gC 3 N 4 also exhibited facile magnetic separability from the reaction mixture after the accomplishment of photocatalysis reaction and stable performance after five cycles. The high photocatalytic efficiency to degrade several dyes, including dyes used in textile industries, under solar light irradiation makes 50CoFe 2 O 4 −50gC 3 N 4 a promising photocatalyst for the treatment of dye-containing wastewater discharged from industries.
Water pollution by the textile industry is a major issue. Therefore, there is a need for methods to remove organic dyes from industrial effluents. Various metal oxides have been used as catalysts for the degradation of dyes. The catalytic efficiency of metal oxides can be enhanced by doping metal oxides with metals. Here we report the synthesis and characterization of nano-sized mixed valence manganese oxide (MnxOy) and silver-doped mixed valence manganese oxide (Ag@MnxOy). We study their photocatalytic efficiency for the photo-degradation of the rhodamine B dye under light irradiation. MnxOy was prepared using KMnO4, MnSO4 and NH3, and Ag@MnxOy was prepared using AgNO3 and Calotropis gigantea plant extract. The prepared materials were characterized by X-ray diffractometry, scanning electron microscopy and Fourier transform infrared spectroscopy. Results show that doping with Ag enhanced the photo-catalytic performance of MnxOy from 11 to 28% and 45 to 91% degradation of rhodamine B dye in 15 and 120 min, respectively. This enhancement is explained by the fact that Ag doping prevents the recombination of photoexcited electrons and positive holes, thus enhancing the photo-catalytic activity of MnxOy.
Water, Air, & Soil Pollution, 2018
CoFe 2 O 4 /Zn 2 SnO 4 composite was synthesized using a simple two-step process and applied as a novel-efficient photocatalyst for the rhodamine B degradation from aqueous solution. Characterization techniques such as X-ray diffraction (XRD), N 2 adsorptiondesorption isotherms, scanning electron microscopy (SEM), EDS analysis, and diffuse reflectance spectroscopy were employed in order to investigate the physical and chemical properties of composite. Higher values of the specific surface area, pore volume and diameter, and a smaller band-gap energy promoted a greater catalytic activity of CoFe 2 O 4 /Zn 2 SnO 4 composite when compared to Zn 2 SnO 4. A rapid decolorization of dye solution was observed at 40 min of reaction using the CoFe 2 O 4 /Zn 2 SnO 4 catalyst, being 2.5 times faster than the Zn 2 SnO 4 alone. Therefore, the CoFe 2 O 4 /Zn 2 SnO 4 composite shows extraordinarily high photocatalytic activity toward the degradation of rhodamine B dye from aqueous solution. Keywords CoFe 2 O 4 /Zn 2 SnO 4. Synthesis. Coupled oxides. Photocatalysis. Rhodamine B
Scientific Reports
nowadays, there is a growing concern about the environmental impacts of colored wastewater. thus, the present work aims the synthesis, characterization and determination of photocatalytic activity of iron oxide (fe 2 o 3) nanocatalyst, evaluating the effect of hybridization with titanium (TiNPs-Fe 2 o 3) and silver (AgNPs-Fe 2 o 3) nanoparticles, on the degradation of Rhodamine B dye (RhB). nanocatalysts were characterized by XRD, SeM, teM, ftiR, n 2 porosimetry (Bet/BJH method), zeta potential and DRS. photocatalytic tests were performed in a slurry reactor, with the nanocatalyst in suspension, using RhB as a target molecule, under ultraviolet (UV) and visible radiation. therefore, the photocatalytic activity of the nanocatalysts (non-doped and hybridized) was evaluated in these ideal conditions, where the AgNPs-Fe 2 o 3 sample showed the best photocatalytic activity with a degradation of 94.1% (k = 0.0222 min −1 , under UV) and 58.36% (k = 0.007 min −1 , under visible), while under the same conditions, the tio 2-P25 commercial catalyst showed a degradation of 61.5% (k = 0.0078 min −1) and 44.5% (k = 0.0044 min −1), respectively. According with the ideal conditions determined, reusability of the AgNPs-Fe 2 o 3 nanocatalyst was measured, showing a short reduction (about 8%) of its photocatalytic activity after 5 cycles. Thus, the Fe 2 o 3 nanocatalyst can be considered a promising catalyst in the heterogeneous photocatalysis for application in the degradation of organic dyes in aqueous solution.
Vietnam Journal of Chemistry
The influence of ammonia on TiO 2-MgFe 2 O 4 catalysts synthesized via a hydrolysis and co-precipitation, followed by calcination at 500 o C, was studied. Two different catalysts, TiO 2-MgFe 2 O 4 (Am) and TiO 2-MgFe 2 O 4 (W), were prepared using Ti-precursors, which were synthesized by the hydrolysis of Ti-butoxide with and without ammonia. The resulting TiO 2-MgFe 2 O 4 catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area measurements, X-ray diffraction, and UV-vis diffuse reflectance techniques. It was revealed that strong electronic coupling exists between the TiO 2 and MgFe 2 O 4 components within the TiO 2-MgFe 2 O 4 catalysts. Photocatalytic activity toward Rhodamine B (RhB) was investigated in aqueous solution under visible light irradiation. TiO 2-MgFe 2 O 4 (W) was found to be an effective catalyst and had several advantages over TiO 2-MgFe 2 O 4 (Am). These results clearly highlight that ammonia had a significant influence on the photocatalytic activity of the TiO 2-MgFe 2 O 4 catalysts. Therefore, the results reported herein indicate that TiO 2-MgFe 2 O 4 is a green, low-cost, and highly efficient photocatalyst for environmental remediation.
Journal of Photochemistry and Photobiology A: Chemistry, 2021
Ti/Fe 2 O 3 (Ti/Fe mass ratio ~ 0.22) magnetic catalysts were prepared by a modified Pechini method and evaluated for heterogeneous photo-Fenton-like process for degradation of Reactive Black 5 (RB5) textile dye under artificial solar light irradiation. Catalysts were calcined at temperatures of 500-700 • C, and were characterized by TGA, XRD, N 2 adsorption/desorption, FTIR, SEM, EDX and UV/Vis DRS analyses. The photo-Fenton experiments were conducted at pH 2.5, H 2 O 2 initial concentration of 12 mmol L − 1 and 0.40 g L − 1 of catalyst. Results showed that catalyst calcined at 500 • C (TiFeO-500) achieved 100 % degradation of textile dye, the highest photoactivity, when compared with the materials calcined at either 600 or 700 • C and to the pure oxides α− Fe 2 O 3 or TiO 2 , under the same conditions. Kinetic data related to RB5 dye degradation with TiFeO-500 catalyst was well fitted to the pseudo-first order model with initial reaction rate of 0.28 mg L − 1 min − 1. The high catalytic activity of this material was favored by its multiple bandgap from UV to visible range, as well as to its nanometric particle size and low agglomeration. Photoreduction efficiency of the Fe 3+ to Fe 2+ was favored by the synergy with Ti 4+ and possible amorphous Fe and Ti oxysulfate species in the photo-Fenton like process for the production of hydroxyl radical (•OH) and dye degradation.