Photocatalytic Degradation of a Basic Dye Using Zinc Oxide Nanocatalyst

The potential of Calcinated and uncalcinated zinc oxide as effective Photocatatlyst for the degradation of malachite green dye, MG from aqueous medium using UV light has been identified. The photocatalysts were characterized using scanning electron microscope, SEM and x-ray diffraction, XRD. The SEM investigations of the calcinated ZnO revealed highly dispersed nanomaterials and the particles were of nanometer size in agreement with the XRD result. The uncalcinated zinc oxide, ZnO revealed some pronounced nanoparticles. The degradation of MG by the photocatalyst was found to be influenced by adsorbent loading and irradiating time. The optimum degradation was obtained at 0.5g catalyst loading of both calcinated and uncalcinated zinc oxide which is 98.48% and 96.31 % respectively at 150 minutes. The degradation kinetics conformed to the pseudo-first-order kinetic model. The present study showed that calcinated and uncalcinated zinc oxide ZnO can be effectively used as efficient photocatalyst for the degradation of Malachite green dyes from aqueous solutions and effluents.

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Photocatalytic degradation of indigo carmine by ZnO photocatalyst under visible light irradiation

Baghdad Science Journal ◽

10.21123/bsj.14.3.582-587 ◽

2017 ◽

Vol 14 (3) ◽

pp. 582-587

Author(s):

Baghdad Science Journal

Keyword(s):

Zinc Oxide ◽

Photocatalytic Degradation ◽

Indigo Carmine ◽

Catalyst Loading ◽

Order Kinetic ◽

Kinetic Reaction ◽

First Order ◽

Pseudo First Order ◽

The Relationship ◽

Influential Parameters

In this work, the photocatalytic degradation of indigo carmine (IC) using zinc oxide suspension was studied. The effect of influential parameters such as initial indigo carmine concentration and catalyst loading were studied with the effect of Vis irradiation in the presence of reused ZnO was also investigated. The increased in initial dye concentration decreased the photodegradation and the increased catalyst loading increased the degradation percentage and the reused-ZnO exhibits lower photocatalytic activity than the ZnO catalyst. It has been found that the photocatalytic degradation of indigo carmine obeyed the pseudo-first-order kinetic reaction in presence of zinc oxide. This was found from plotting the relationship between ln (C0/Ct) and irradiation the rate constant of the process.UV- spectrophotometer was used to study the indigo carmine photodegradation.

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Decolourization of malachite green dye by mentha plant biochar (MPB): a combined action of adsorption and electrochemical reduction processes

Water Science & Technology ◽

10.2166/wst.2018.059 ◽

2018 ◽

Vol 77 (6) ◽

pp. 1734-1743 ◽

Cited By ~ 4

Author(s):

Abhay Prakash Rawat ◽

D. P. Singh

Keyword(s):

Malachite Green ◽

Electron Transfer Reaction ◽

Order Kinetic ◽

Voltammetric Analysis ◽

Malachite Green Dye ◽

Type Iv ◽

Bet Analysis ◽

Order Kinetic Model ◽

Combined Action ◽

Adsorption Desorption

Abstract Adsorption behavior of mentha (mint) plant biochar (MPB) in removal of malachite green (MG) dye from aqueous solution was analyzed as a function of different pH (4.0–10.0), initial dye concentration (20–100 mg/L), contact time (0–45 min) and dose of adsorbent (0.05–0.3 g/100 mL). The zeta potential of the MPB particles was found to be −37.9 mV, indicating a negatively charged sorption surface of MPB particles. MPB was found to be more effective in removal of MG dye at pH 6.0 due to combined action of physico-chemisorption and a reductive electron transfer reaction. Results on the Brunauer–Emmett–Teller (BET) analysis of the N2 adsorption–desorption isotherm of MPB as adsorbent showed sigmoidal shape similar to the type IV isotherm and mesoporous nature. The cyclic voltammetric analysis of MG dye showed a reversible, coupled redox reaction at the interface of dye molecules and MPB particles. The maximum monolayer adsorption capacity (qmax) of MPB was found to be 322.58 mg g−1. The separation factor (RL) value was between 0 and 1, indicating a favourable adsorption of MG dye onto MPB. The results fitted well to a pseudo-second-order kinetic model. Further results from desorption experiments showed recovery of MG dye by about 50% in the presence of 1 N HCl.

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Photocatalytic Properties of Microwave-Synthesized TiO2 and ZnO Nanoparticles Using Malachite Green Dye

Journal of Nanoparticles ◽

10.1155/2013/310809 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 11

Author(s):

A. K. Singh ◽

Umesh T. Nakate

Keyword(s):

Malachite Green ◽

Zno Nanoparticles ◽

Uv Light ◽

Hexagonal Wurtzite Structure ◽

Stoichiometric Ratio ◽

X Ray Diffraction ◽

Zno Nps ◽

Malachite Green Dye ◽

Photodegradation Rate ◽

Scherrer Formula

TiO2 and ZnO nanoparticles (NPs) were synthesized using microwave-assisted method. Synthesized NPs were characterized for their structure, morphology, and elemental composition using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The crystallite size of synthesized NPs of TiO2 and ZnO was about 12.3 and 18.7 nm as obtained from the Scherrer formula from the most intense XRD peak. The synthesized NPs have been found to be in stoichiometric ratio having anatase and hexagonal wurtzite structure for TiO2 and ZnO, respectively, and are spherical in shape. Surface area of TiO2 and ZnO NPs was found to be about 43.52 m2/g and 7.7 m2/g. Photocatalytic (PC) properties of synthesized NPs were studied for malachite green (MG) dye under UV light. TiO2 NPs were found to be highly photocatalytically active among the two, having efficiency and apparent photodegradation rate of 49.35% and , respectively.

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Adsorption and photocatalytic degradation of malachite green by vanadium doped zinc oxide nanoparticles

Water Science & Technology ◽

10.2166/wst.2015.555 ◽

2015 ◽

Vol 73 (4) ◽

pp. 881-889 ◽

Cited By ~ 9

Author(s):

L. Khezami ◽

Kamal K. Taha ◽

Imed Ghiloufi ◽

Lassaad El Mir

Keyword(s):

Zinc Oxide ◽

Photocatalytic Degradation ◽

Malachite Green ◽

Dye Adsorption ◽

Nitrogen Adsorption ◽

Order Kinetic ◽

Adsorption Method ◽

First Order ◽

Degradation Data ◽

Pseudo First Order

Herein the degradation of malachite green (MG) dye from aqueous medium by vanadium doped zinc oxide (ZnO:V3%) nanopowder was investigated. The specific surface area and pore volume of the nanopowder was characterized by nitrogen adsorption method. Batch experimental procedures were conducted to investigate the adsorption and photocatalytic degradation of MG dye. Adsorption kinetics investigations were performed by varying the amount of the catalyst and the initial dye concentrations. Adsorption and photocatalytic degradation data were modeled using the Lagergren pseudo-first-order and second-order kinetic equation. The results showed that the ZnO:V3% nanopowder was particularly effective for the removal of MG and data were found to comply with Lagergreen pseudo-first-order kinetic model.

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A novel magnetic biochar from sewage sludge: synthesis and its application for the removal of malachite green from wastewater

Water Science & Technology ◽

10.2166/wst.2016.386 ◽

2016 ◽

Vol 74 (8) ◽

pp. 1971-1979 ◽

Cited By ~ 13

Author(s):

Jing Zhang ◽

Mao Liu ◽

Tao Yang ◽

Kai Yang ◽

Hongyu Wang

Keyword(s):

Sewage Sludge ◽

Malachite Green ◽

Strontium Hexaferrite ◽

Order Kinetic ◽

Mass Ratio ◽

X Ray Diffraction ◽

Magnetic Biochar ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

In this study, a novel magnetic sludge biochar (MSBC) from sewage sludge was created by the assembly of strontium hexaferrite (SrFe12O19) onto the surface of sewage sludge biochar (SBC) under high-temperature and oxygen-free conditions. The characterization of MSBC was achieved by Fourier transform infrared spectroscopy, X-ray diffraction and vibrating sample magnetometry, and the adsorption properties of the MSBC towards malachite green (MG) from aqueous solution were systematically investigated. The influence of variables (different mass ratio of SBC and SrFe12O19, initial MG concentration, absorbent dosage, pH and contact time) was also studied in detail. The optimal adsorption amount of MG (388.65 mg MG/g) was obtained with 500 mg MG/L, 2.0 g MSBC/L for 40 min under pH of 7.0, with different mass ratios of SBC and SrFe12O19 (1:4, 1:2, 3:4 and 1:1), when the mass ratio of SBC and SrFe12O19 was 3:4 at room temperature, and the Langmuir model was more suitable than the Freundlich model for equilibrium data. Meanwhile, the kinetic models showed that the overall adsorption process was better described by a pseudo-second-order kinetic model. The results indicated that the MSBC was a novel, efficient, magnetically separable adsorbent for the removal of the dye from wastewater.

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Degradation of dye wastewater by persulfate activated with Fe3O4/graphene nanocomposite

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2016.187 ◽

2016 ◽

Vol 6 (4) ◽

pp. 553-561 ◽

Cited By ~ 10

Author(s):

Xiao-Bao Gong

Keyword(s):

Organic Contaminants ◽

Precipitation Method ◽

Order Kinetic ◽

Dye Wastewater ◽

X Ray Diffraction ◽

First Order ◽

Order Kinetic Model ◽

Infrared Spectrometer ◽

Graphene Nanocomposite ◽

Co Precipitation

In this study, Fe3O4/graphene nanocomposite was synthesized through a liquid-phase co-precipitation method and characterized using X-ray diffraction and Fourier transform infrared spectrometer. The synthetic Fe3O4/graphene was used as a heterogeneous catalyst to activate persulfate to efficiently degrade methylene blue (MB). The target pollutant MB can be degraded by sulfate radicals depending on several parameters including persulfate and Fe3O4/graphene concentrations, pH and reaction temperature. Within 120 min of reaction time, almost 100% of 0.05 mM MB was removed by 1.5 mM persulfate in the presence of 150 mg/L of Fe3O4/graphene at pH = 6.0 and 25 °C. The degradation of MB was found to follow the pseudo-first-order kinetic model. The Fe3O4/graphene has much better stability and reusability than free Fe3O4 suggested by reuse tests. The results demonstrate that Fe3O4/graphene activated persulfate is a promising technology for remediation of water pollution caused by organic contaminants.

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Photocatalytic Behaviour of Zinc Oxide/Polystyrene Nanocomposite for Removal of Malachite Green Dye under UV-Light

10.7546/crabs.2020.02.08 ◽

2020 ◽

Author(s):

Katerina Zaharieva ◽

Silvia Dimova ◽

Mariya Kyulavska ◽

Filip Ublekov ◽

Irina Stambolova ◽

...

Keyword(s):

Zinc Oxide ◽

Malachite Green ◽

Uv Light ◽

Malachite Green Dye

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Decolorizing of Malachite Green Dye by Adsorption Using Corn Leaves as Adsorbent Material

Journal of Engineering ◽

10.31026/j.eng.2021.02.01 ◽

2021 ◽

Vol 27 (2) ◽

pp. 1-12

Author(s):

Omar Hisham Fadhel ◽

Mohammed Yaqob Eisa ◽

Ziad Rafaa Zair

Keyword(s):

Aqueous Solution ◽

Malachite Green ◽

Contact Time ◽

Freundlich Isotherm ◽

Order Kinetic ◽

Batch Mode ◽

Adsorbent Dosage ◽

First Order ◽

Malachite Green Dye ◽

Pseudo First Order

This paper presents the ability to use cheap adsorbent (corn leaf) for the removal of Malachite Green (MG) dye from its aqueous solution. A batch mode was used to study several factors, dye concentration (50-150) ppm, adsorbent dosage (0.5-2.5) g/L, contact time (1-4) day, pH (2-10), and temperature (30-60) The results indicated that the removal efficiency increases with the increase of adsorbent dosage and contact time, while inversely proportional to the increase in pH and temperature. An SEM device characterized the adsorbent corn leaves. The adsorption's resulting data were in agreement with Freundlich isotherm according to the regression analysis, and the kinetics data followed pseudo-first-order kinetic with a correlation coefficient of 0.9309. The thermodynamic data show that the process is exothermic and reversible. The highest removal of MG was 91%, which gave proof that the corn leaves as adsorbent material have the capability of adsorbing the MG dye for aqueous solutions

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Enhanced photocatalytic degradation of doxycycline using a magnetic polymer-ZnO composite

Water Science & Technology ◽

10.2166/wst.2018.237 ◽

2018 ◽

Vol 2017 (3) ◽

pp. 791-801 ◽

Cited By ~ 2

Author(s):

Ali Mohammadi ◽

Shabnam Pourmoslemi

Keyword(s):

Aqueous Solution ◽

Photocatalytic Degradation ◽

Extraction Efficiency ◽

Nano Particles ◽

Order Kinetic ◽

X Ray Diffraction ◽

X Ray ◽

First Order ◽

Polymer Precipitation ◽

Order Kinetic Model

Abstract A novel magnetic polymer-ZnO composite was prepared by incorporating Fe3O4 and ZnO nano-particles in the structure of an adsorbent polymer. Precipitation polymerization was used for synthesizing the adsorbent polymer and its efficiency for extracting doxycycline from aqueous solution was optimized according to several parameters including time, pH and amount of polymer. Results showed the highest extraction efficiency at neutral pH of the doxycycline solution in 20 min, and the capacity of the polymer was about 20 mg/g. The magnetic property of a material is important for fast and facile separation of composite particles after each use. Magnetic polymer-ZnO composite was synthesized by adding Fe3O4 and ZnO nano-particles to the polymerization mixture in order to take advantage of both sorption and photocatalytic degradation mechanisms. The obtained composite was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy equipped with wavelength dispersive X-ray spectroscopy and used for enhanced photocatalytic degradation of doxycycline in aqueous solution. Results showed 76.5% degradation of doxycycline in 6 hours which was significantly higher than the degradation observed by an equivalent amount of ZnO nano-particles. Photocatalytic degradation of doxycycline fitted the pseudo first order kinetic model with a rate constant of 4 × 10−3 μg mL−1 min−1.

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Photocatalytic and Antibacterial Properties of Ag-CuFe2O4@WO3 Magnetic Nanocomposite

Nanomaterials ◽

10.3390/nano11020298 ◽

2021 ◽

Vol 11 (2) ◽

pp. 298

Author(s):

Mohammad Hossein Sayadi ◽

Najmeh Ahmadpour ◽

Shahin Homaeigohar

Keyword(s):

Drug Concentration ◽

Uv Light ◽

Antibacterial Properties ◽

Order Kinetic ◽

Magnetic Photocatalyst ◽

First Order ◽

Photodegradation Efficiency ◽

Uv Light Irradiation ◽

Efficient Performance ◽

Order Kinetic Model

This study aimed to synthesize a new magnetic photocatalytic nanosystem composed of Ag-CuFe2O4@WO3 and to investigate its photodegradation efficiency for two drug pollutants of Gemfibrozil (GEM) and Tamoxifen (TAM) under Ultraviolet (UV) light irradiation. In this regard, the effect of pH, catalyst dosage, and drug concentration was thoroughly determined. The largest photodegradation level for GEM (81%) and TAM (83%) was achieved at pH 5, a photocatalyst dosage of 0.2 g/L, drug concentration of 5 mg/L, and contact time of 150 min. The drug photodegradation process followed the pseudo first-order kinetic model. In addition to the photodegradation effect, the nanocomposites were proved to be efficient in terms of antibacterial activity, proportional to the Ag doping level. The Ag-CuFe2O4@WO3 nanocomposite exhibited a stable, efficient performance without an obvious catalytic loss after five successive cycles. Taken together, the developed magnetic photocatalyst is able to simultaneously disinfect wastewater streams and to degrade pharmaceutical contaminants and thus shows a promising potential for purification of multi-contaminant water systems.

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