Photocatalytic Degradation of Alizarin Red S by Using a Layered Zn/Al-NO3 Double Hydroxides (original) (raw)
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Efficient Photocatalytic Degradation of Alizarin Red S by Silver-Impregnated Zinc Oxide
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Photodegradation of Alizarin Black S Dye Using Zinc Oxide
Zinc oxide (ZnO) has been used as heterogeneous catalyst for the degradation of Acid Alizarin Black S dye (AAB) in aqueous solutions using UV light irradiation. Experiments were conducted at various operating parameters. The operating parameters were amount of catalyst (50 mg, 100 mg and 150 mg), initial concentration of dye (30 mg/L, 50 mg/L and 70 mg/L), the pH of solution (2, 4, 6, 8, 10 and 12) and the UV light intensity (6 watt and 12 watt). The progress of the degradation reaction was monitored spectrophotometrically. It was found that the degradation process of AAB solution was accelerated with increased catalyst dosage and decreased initial concentration of AAB. It was also found that the removal efficiency of AAB significantly depend on pH value of solution. The results show that the degradation percent reaches the highest values with pH close to neutral. The data proved that removal percent of dye decreased when 6 watt lamp used instead of 12 watt lamp. The kinetic study confirmed that photocatalytic degradation of AAB dye follows a pseudo first order reaction rate.
Photocatalytic Removal of Alizarin Yellow R from Water using Modified Zinc Oxide Catalyst
Asian Journal of Chemistry, 2016
The research described about the photocatalytic efficiency of zinc oxide on the photolysis of Alizarin Yellow R. Alizarin Yellow R was used as a model of azo dyes which regarded as a main water pollutants. Some variables influencing the process where studied such as: calcination temperature of catalyst, concentration of the dye, weight of catalyst, time of irradiation and doping by transition metal ions. The best degradation percentage obtained was 92.541 % by using zinc oxide prepared at calcination temperature 773 K, weight 0.3 g, dye concentration 40 ppm and through 2 h irradiation time of dye solution in the presence of medium pressure mercury lamp 400 watt. The percentage obtained was 90.850 % by using ZnO-Co, The kinetic studies showed that the reaction from pseudo first order.
JOURNAL OF ADVANCES IN CHEMISTRY
In the present study photocatalytic degradation of hazardous water soluble alizarin red dye by using Fe-Co nanoparticles has been investigated. Fe-Co nanoparticles was synthesized by chemical co-precipitation method and characterized by TEM, SEM, EDAX and XRD. The photocatalytic degradation have been studied with the help of variety of parameters such as catalytic dose, dye concentration, pH, contact time and most important chemical oxygen demand. It was observed that The photocatalytic degradation of alizarin red dye by using Fe-Co nanoparticles was an effective ,economic, ecofriendly and faster mode of removing dye from an aqueous solution. The optimum condition for the degradation of the dye was 50 mg/L,pH 8.0, catalyst dose 60 mg/L and contact time 60 minutes. The kinetic studies also have been studied.
Chemical Engineering Journal, 2012
Zn/Fe layered double hydroxides with different intercalated anions (nitrate, chloride and carbonate) as visible-light response photocatalysts were fabricated by co-precipitation method. The as-prepared LDH photocatalysts were characterized by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared (FT-IR), Thermo Gravimetric/Differential Thermal Analysis (TG/DTA), BET surface area, SEM, TEM and simultaneously optical absorption spectra. The photocatalytic activity of the catalysts was studied by degradation of aqueous methyl violet (MV) and malachite green (MG) under solar light. Under optimal conditions, among various anions intercalated samples carbonate intercalated Zn/Fe LDH exhibited highest activity. The kinetics and mechanism of photocatalytic dye degradation over Zn/Fe-CO 3 LDH were also discussed.
The Global Environmental Engineers, 2014
The Zn-Al layered double hydroxide (LDH) was prepared using co-precipitation method at constant pH and characterized from structural point of view. Due to the high concentration of ZnO obtained after LDH calcinations, the material can be used as photocatalyst in removal of organic persistent compounds from water. The photocatalytic activity of the as-synthesized and calcined materials was evaluated for the degradation of Methyl Orange dye under UV irradiation. The influence of calcination temperature, solid: liquid ratio and initial dye concentration on photocatalytic activity of LDH was studied. The increase of calcination temperature and solid: liquid ratio and the decrease of initial dye concentration leads to increasing degradation efficiency.
Zn–Al layered double hydroxides: Synthesis, characterization and photocatalytic application
Microporous and Mesoporous Materials, 2008
Zn/Al-LDHs with cationic ratio of 1-4 were prepared by the co-precipitation method at constant pH. The XRD patterns showed that additional phase is present in all samples due to the lattice strains created when more Zn 2+ is added and the longer periods of hydrothermal treatment. The as-synthesized samples were calcined at different temperatures and the phase transformations were fully investigated by XRD, IR, TG/DTG, UV-vis-DR, N 2 adsorption/desorption, SEM and EDX methods. Infrared spectroscopy revealed that the characteristic layered double hydroxide structure is not fully destroyed. The EDX analysis showed that the increase of the calcination temperature leads to a diffusion of the Zn 2+ cations to the surface of the particles. The photocatalytic activity was evaluated for the degradation of the methyl-orange dye. The band gap energy decreases as the calcination temperature increases indicating that less energy is needed for the photocatalytic process. The photocatalytic activity increases with the increase of the cationic ratio and the calcination temperature. 93% of the dye could be removed by the Zn/Al-LDH with the cationic ratio of 4 and calcined at 500°C.
HOMOGENEOUS PHOTOCATALYTIC DEGRADATION OF ACID ALIZARIN BLACK USING HYDROGEN PEROXIDE
Photocatalytic degradation of acid alizarin black (AAB) dye (C.I. 21725) in aqueous solution was investigated using UV light in the presence of hydrogen peroxide (H2O2) as a catalyst at different operating conditions. The operating conditions were concentration of catalyst dosage (0.1, 0.2 and 0.3 mL of 30 % H2O2), initial concentration of AAB dye (100, 150 and 200 mg/L) and pH (3.3, 6.84 and 10.8). It was found that the increasing of catalyst concentration enhanced the dye decolourisation. Hydrogen peroxide exerted positive effects on the AAB removal whilst the initial concentration of AAB negatively affected its removal. It was also found that the removal efficiency of AAB increased with the pH value close to neutral (pH 7), while a reversed trend was observed at acidic and basic medium.
PHOTOCATALYTIC DEGRADATION OF ACID ALIZARIN BLACK USING POWDER AND NANOPARTICLES OF TITANIUM DIOXIDE
Photocatalytic degradation of acid alizarin black (AAB) dye (C.I. 21725) in aqueous solution was investigated using UV light in the presence of powder of titanium dioxide (P- TiO2) and nanoparticles of titanium dioxide (N- TiO2) as a catalyst. The operating conditions were catalyst dosage (10 and 20 mg/L) and initial concentration of AAB dye (10 and 20 mg/L). It was found that the increasing of catalyst concentration enhanced the dye decolourisation. Both catalysts exerted positive effects on the AAB removal whilst the initial concentration of AAB negatively affected its removal.
2014
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