Degradation Of Methyl Orange Dye Research Articles

Synthesis and characterization of CdS/CeO2 Nanocomposite with improved visible-light photocatalytic degradation of methyl orange dye

Different types of photocatalysts in single and binary systems in different molar ratios were synthesized by the co-precipitation method. Crystal structure, surface area, morphology, bandgap energy, functional groups, and optical properties of the as-synthesized photocatalysts were characterized by using XRD, BET, SEM-EDX, UV/Vis, FTIR, and PL instruments, respectively. Photocatalytic activities of the single and binary composite were evaluated by using an aqueous solution of model pollutant MeO. Photocatalytic activities of binary CdS/CeO2 (1:1) nanocomposite were found to be higher than those of single counterparts. The degradation efficiencies of the binary system were found to be 53.73%. The reusability of the binary photocatalyst was tested and only about 33% decrement was observed after four successive runs. The degradation of MeO dye follows the pseudo-first-order kinetics for the entire as-synthesized nanocomposite. The results also suggest that in the CdS/CeO2 (1:1) composite the photoinduced electrons and holes can be effectively separated.

Zn(II) porphyrin sensitized (TiO2@Cd-MOF) nanocomposite aerogel as novel photocatalyst for the effective degradation of methyl orange (MO) dye

The highly porous three-dimensional TiO2@Cd-MOF (MOF - Metal-organic framework) nanocomposite aerogels were synthesized through a slightly modified version of the conventional sol-gel method used to synthesize mesoporous TiO2 aerogels. The as-prepared nanocomposite aerogels were further immersed in solutions of Zn(II) porphyrin (ZnPp) to obtain Zn(II) porphyrin-sensitized nanocomposite aerogel (TiO2@Cd-MOF)@ZnPp. The newly synthesized (TiO2@Cd-MOF)@ZnPp materials were used as novel heterogeneous photocatalyst and their photocatalytic performances were evaluated by testing the photodegradation of model pollutant methyl orange (MO) dye under visible-light irradiation. The obtained results showed that the heterogeneous photocatalysts exhibited a superior photocatalytic activity compared with pure aerogel and nanocomposite aerogel towards the degradation of pollutants. The maximum degradation efficiency of 94.1% was obtained for heterogeneous photocatalyst. Further, the results of recycle tests confirmed the good photostability of the photocatalyst. The synergistic effects of the heterostructure, an enhanced optical absorption, and efficient electron injection are the prime factors responsible for the photocatalytic activity improvement of (TiO2@Cd-MOF)@ZnPp photocatalysts.

Green synthesis of surfactant-capped silver nanoparticles using ginger extract and investigation of its catalytic activity in the reductive degradation of methyl orange dye and 4-nitrophenol

Green synthesis of surfactant-capped silver nanoparticles using ginger extract and investigation of its catalytic activity in the reductive degradation of methyl orange dye and 4-nitrophenol

Photocatalytic Study of Mo/N co-doped Titanium Dioxide (TiO2) Nanoparticles Under Visible Light Irradiation

Undoped TiO2 and Mo/N co-doped TiO2 nanoparticles have been fabricated by sol gel technique. The average particle size of nanoparticles was calculated from the line broadening of (101) peak of XRD pattern and further verified by High Resolution Transmission Electron Microscopy (HRTEM) are in good agreement. The decrease in particle size 28.5 to 15.0 nm was observed with increase of molybdenum concentration. The surface morphology of all samples was studied by Field Emission Scanning Electron Microscopy shows small agglomeration. The optical band gap energy was calculated using UV-visible absorption spectroscopy and found to decrease in increase of doping concentration. The presence of defect levels caused by oxygen vacancies has been confirmed by Photoluminescence spectra. The emission bands observed at 453.9, 470.6, 485.7, 495.8 and 535 nm could be arising from surface states. The phase composition and elemental analysis of synthesized samples was estimated from Energy dispersive X-ray spectroscopy. The effect of doping concentration on structural formation was studied by FTIR spectroscopy. The Photocatalytic activity of synthesized samples for degradation of Congo red (CR) and Methyl orange (MO) dyes as standard pollutants was investigated under visible light source. The increase in doping concentration causes enhance in photocatalytic activity of the synthesized nanoparticles which is attributed from the decrease in electron-hole pair recombination rates. The degradation efficiency against congo red dye is very high compared to methyl orange dye. These observations suggest that co-doped synthesized nanoparticles are suitable for complete degradation of congo red dye and are not able to degrade methyl orange dye.

Non-Thermal Plasma Reduction of Ag+ Ions into Silver Nanoparticles in Open Atmosphere under Statistically Optimized Conditions for Biological and Photocatalytic Applications.

An environmentally friendly non-thermal DC plasma reduction route was adopted to reduce Ag+ ions at the plasma–liquid interface into silver nanoparticles (AgNPs) under statistically optimized conditions for biological and photocatalytic applications. The efficiency and reactivity of AgNPs were improved by statistically optimizing the reaction parameters with a Box–Behnken Design (BBD). The size of the AgNPs was chosen as a statistical response parameter, while the concentration of the stabilizer, the concentration of the silver salt, and the plasma reaction time were chosen as independent factors. The optimized parameters for the plasma production of AgNPs were estimated using a response surface methodology and a significant model p < 0.05. The AgNPs, prepared under optimized conditions, were characterized and then tested for their antibacterial, antioxidant, and photocatalytic potentials. The optimal conditions for these three activities were 3 mM of stabilizing agent, 5 mM of AgNO3, and 30 min of reaction time. Having particles size of 19 to 37 nm under optimized conditions, the AgNPs revealed a 82.3% degradation of methyl orange dye under UV light irradiation. The antibacterial response of the optimized AgNPs against S. aureus and E. coli strains revealed inhabitation zones of 15 mm and 12 mm, respectively, which demonstrate an antioxidant activity of 81.2%.

Study of optical and morphological properties of nanoparticles semiconductors of zinc oxide synthesized using Mimosa tenuiflora extract for photodegradation of methyl orange

In this work, we report the synthesis of zinc oxide nanoparticles semiconductors using Mimosa tenuiflora extract, as a reducing and stabilizing agent, as well as its photocatalytic activity. The synthesis of ZnO was performed under mild and eco-friendly conditions employing different concentrations 0%, 4%, 6%, and 8% (weight/volume) of extract. The effects of the extract the concentration on the optical, morphological, and structural properties of ZnO nanoparticles were studied by different techniques such as UV–Vis, PL, SEM, FT-IR, and XRD. The results demonstrated the obtaining of agglomerated quasi-spheric nanoparticles, with a crystalline structure similar to wurtzite, and bandgap values dependent on extract concentration. Fourier transform infrared spectroscopy shows the presence of Zn–O vibration band at 447 cm−1. The photocatalytic activity was evaluated by the degradation of methyl orange (MO) dye, as an organic model dye, when is subjected to solar and UV radiation, as well as darkness, where it undergoes degradation around 62%, 100%, and 5%, respectively. The high photocatalytic activity and rate were related to the small particle size, that could provide an efficient interaction between dye and photocatalyst, and at the same time, allow the photon absorption and induce dye photodegradation.

Synthesis of CuAl-layered double hydroxide/MgO2 nanocomposite catalyst for the degradation of organic dye under dark condition

Water pollution as a result of releasing organic and inorganic pollutants is the main concern and health risk factor for human beings. To minimize the effect of toxicity from pollutants, enormous method has been applied. In this report, the CuAl-layered double hydroxide/MgO2 composite catalysts were synthesized via in-situ growth of magnesium peroxide on the layered double hydroxide (LDH) sheet. The preparations of the catalysts were performed with varying the ratio of LDH: MgO2 which was abbreviated as CuAl-LDH/MgO2-35, CuAl-LDH/MgO2-50, and CuAl-LDH/MgO2-65 for 35:65, 50:50, and 65:35% weight ratios, respectively. The prepared catalysts were characterized and evaluated for methyl orange (MO) dye degradation at room temperature under dark conditions. Among the catalysts, CuAl-LDH/MgO2-50 showed an excellent Fenton-like reaction under neutral condition at which 97% of MO was degraded in the 100 min reaction. However, CuAl-LDH, MgO2, CuAl-LDH/MgO2-35, and CuAl-LDH/MgO2-65 catalysts degrade only 61, 8, 35, and 69% of MO dye. The highest degradation efficiency for CuAl-LDH/MgO2-50 could be due to the presence of optimum amount of copper along with the sufficient amount of generated hydrogen peroxide from MgO2 to run the Fenton-like reaction process. Moreover, the catalyst can also be able to use repeatedly with a minimum loss of activity. In general, the result suggests that CuAl-LDH/MgO2 composite is an option for the degradation of organic pollutants.

Controlled synthesis of silver/silver chloride composite crystals from [AgCl2]- complex and its photocatalysis properties on organic pollutants

The visible light catalyst has aroused scientific interest in order to address issues such as energy scarcity and pollution. Many parameters, such as morphology, composition, and structure, influence photocatalytic performance of semiconductors. Here, a new method of surfactant-assisted nanometer/micron size AgCl crystals with controllable morphology was attained and then formed Ag@AgCl crystals due to partial photoreduction of AgCl under the visible light. Temperature, humidity, and the quantity of surfactant (polyvinylpyrrolidone, PVP) were all controlled to produce different morphologies. It was found that the existence of PVP was the trigger for the synthesis of the linear AgCl crystals. The growth rate and time of AgCl crystals formation could be controlled by adjusting temperature and humidity conditions. The structure and constituents of the synthesized Ag@AgCl crystals were characterized by a polarizing microscope (POM), scanning electron microscope (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). The photocatalytic activity of catalyst was evaluated using methyl orange (MO) dye degradation studies. The results showed that too much or too little PVP did not favor the degradation of MO, and the pine needle-like crystals synthesized at a PVP / AgNO3 mass ratio of 5% showed the best photodegradation of MO with recyclability. Therefore, this study provides a new opportunity for the simple and controllable synthesis of Ag@AgCl crystals with rich morphologies.

Investigation of catalytic potential of sodium dodecyl sulfate stabilized silver nanoparticles for the degradation of methyl orange dye

Sodium dodecyl sulfate (SDS) was employed as a stabilizing agent for the preparation of Ag-NPs while using AgNO3 salt as a source of silver ions and sodium borohydride as a reducing agent in an aqueous medium. Synthesized sodium dodecyl sulfate stabilized silver nanoparticles (Sd@Ag-NPs) were extensively characterized by FTIR, UV–Vis spectroscopy, SEM, XRD and DLS analysis. After that, Sd@Ag-NPs particles were employed as an active catalyst for the reduction of methyl orange (MO) and Rhodamine B (Rh-B) dyes. At first, reduction of MO was carried out in the presence of a catalyst and an excessive amount of NaBH4 in water medium. Reduction of MO was completed in 21 min while the value of apparent rate constant (kapp) was found as 0.385 min −1. Reduction of Rh-B was completed in 15 min with the value of kapp found as 0.131 min−1. Controlled reactions were also performed for the reduction of MO in the absence of catalyst and in the absence of NaBH4 to check the kinetic feasibility of the reaction as well as to check either the decrease in absorbance value was due to the adsorptive action of Sd@Ag-NPs or its working as a catalyst. It was concluded that MO reduction was completed in feasible time in the presence of catalyst. The activity of 9 months old catalyst was slightly decreased as compared to the freshly prepared catalyst for the reduction of MO under same reaction conditions. It was also concluded that Sd@Ag-NPs catalyst successfully degraded the MO dye in the presence of another toxic dye Rh-B in a feasible time. It indicates that our reported Sd@Ag-NPs catalyst can simultaneously reduce the mixture of dyes.

A Study on Photocatalytic Efficiency of Hybrid Titanium Dioxide Nanowires/Reduced Graphene Oxide (TiO2NWs/RGO) for Degradation of Methyl Orange Dye

The major concern of this research is to improve photocatalytic efficiency by implementation of hybrid TiO2NWs/RGO for dye degradation. The TiO2NWs/RGO was prepared using fabrication method. Titanium (IV) oxide powder and graphite were used as precursors to synthesis of TiO2NWs and RGO, respectively. Physical and chemical properties of the photocatalyst was investigated by Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Adsorption-desorption nitrogen analysis and their photocatalytic efficiency was studied for methyl orange (MO) degradation. The hybrid almost achieved 100% of MO degradation within 210 minutes and shows the highest photocatalytic activity. Furthermore, It was fixed to the Langmuir–Hinshelwood model and the degradation of MO dye by each sample obeys first-order reaction kinetics that it shows a good performance of photodegradation rate of dyes by heterogenous catalyst. This is due the 1D/2D heterostructures of TiO2NWs/RGO hybrid that has a large surface area, unique optical properties, flexible structure and excellent mobility of charge carriers.

French Fries-Like Bismuth Oxide: Physicochemical Properties, Electrical Conductivity and Photocatalytic Activity

Bismuth oxide synthesis using hydrothermal method has been conducted. This study aims to examine the effect of the hydrothermal reaction time on product characteristics and photocatalytic activity in degrading methyl orange dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) and Na2SO4 in a distilled water and added NaOH gradually. The solution formed was transferred into a Teflon-lined autoclave and heated at 120 °C with time variations of 8–16 h. The formation of bismuth oxide was indicated by the vibrations of the Bi−O−Bi and Bi−O groups and the crystal structure consisting of a-Bi2O3, β-Bi2O3, and g-Bi2O3. In addition, the highest photocatalytic activity can be examined through several factors, such as: content of Bi−O−Bi and Bi−OH groups, crystal structure, band gap values, morphology, and surface area, acquired as a result of the effect of hydrothermal reaction time. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Photocatalytic Degradation of Congo Red and Methyl Orange Dye Under Visible Light Using Silver and Iron co-doped TiO2 Nanoparticles

In the present report TiO2 nanoparticles co-doped with iron and different mol % of silver have been successfully synthesized by sol-gel route and studied by X-ray diffraction (XRD), Energy dispersive X-ray spectroscopy (EDX), UV-visible absorption spectroscopy (UV-Vis), Photoluminescence spectroscopy (PL), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), and FTIR spectroscopy. The XRD data analysis confirms the formation of mixed phases of TiO2 (anatase) and Ag2O phase. The crystalline size was vary from 48.0 nm to 44.6 nm determined from XRD further verified from TEM micrograph. The EDXS measurements suggest that iron is completely incorporated however silver has not incorporated into TiO2 matrix. The optical band gap of the prepared nanoparticles was calculated by UV-Visible absorption spectroscopy using Tauc-Davis and Mott expression and found to varying from 2.92 to 2.30 eV. The absorption bands in the UV-visible spectra shift towards higher wave length region and appearance of emission bands in PL spectra confirms the formation of energy substates in the forbidden gap of the prepared samples. TEM micrographs showed that prepared nanoparticles are somewhat spherical in shape. The formation of different functional groups and bonds in the structure of synthesized nanoparticles as observed in FTIR spectra helps in degradation of organic dyes (congo red and methyl orange) and enhance the photocatalytic activity under visible light. It is observed that the higher doping concentration of silver causes to decrease the band gap energy as a result the carrier recombination rate decreases and therefore enhance the degradation efficiency.

Theoretical and experimental study of the photodegradation of methyl orange in the presence of different morphologies of Au-ZnO using Monte Carlo dynamic simulation.

Herein, a simple approach was formed based on synthesizing different morphologies of ZnO and Au-ZnO as photocatalyst. In this study, ZnO and Au-ZnO were synthesized via a co-precipitation method and fully characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX). Three different ratios of Zn2+:OH- (1:2, 1:3, and 1:5) controlled the morphology of samples, which were made into spindle, star, and flower structures, respectively. Then, the photocatalytic activity was studied and compared. Their comparison showed that the flower morphology for ZnO and Au-ZnO was more effective in photocatalytic degradation and decolorization of methyl orange dye. Also, quantum and Monte Carlo (MC) calculations were carried out to investigate the adsorption of methyl orange (MO) molecules on ZnO(111) surface in the presence of Au or without Au in aqueous conditions by Monte Carlo adsorption locator simulations in the Materials Studio 2017 software. Au created a tendency to form a relatively strong interaction of MO with the ZnO(111) surface. The adsorption of MO on Au-ZnO(111) in the presence of Au was more significant than that of MO on ZnO(111), suggesting Au could significantly improve the reactivity of the methyl orange toward the ZnO(111).

Carbon Quantum Dots (CQDs) Based Composites Photocatalyst for Wastewater Purification

A comparative study of the Carbon Quantum Dots (CQDs) based composites photocatalyst for water purification was carried out. New finding of CQDs and TiO2 have demonstrated significant advantage since it provides environmentally friendly for photocatalytic degradation of methyl orange (MO) dye. CQDS and TiO2 were prepared by using hydrothermal method. The CQDs and CQDS/TiO2 were fully characterized by using transmission electron microscope (TEM) to identify the size range and shape that involve in the adsorption process. The synthesized CQDs and CQDs/TiO2 had small semi spherical morphology with 5 nm in size. The result of photocatalytic activity revealed that there is photocatalytic degradation of MO in the presence of only pure CQDs and CQDs/TiO2 composites which the value of concentration decreased against time. CQDs/TiO2 exhibited higher photocatalytic activity, which indicated that both CQDs and TiO2 played important roles for the high photocatalytic activity under visible light irradiation.

Three Isomeric Zn(II)-Sn(IV)-Zn(II) Porphyrin-Triad-Based Supramolecular Nanoarchitectures for the Morphology-Dependent Photocatalytic Degradation of Methyl Orange.

Three isomeric Zn(II)–Sn(IV)–Zn(II) porphyrin-based triads (T2, T3, and T4) were synthesized by the reaction of common Zn(II) porphyrins (ZnL) with different Sn(IV) porphyrins (SnPn). The Sn(IV) porphyrin precursors differ with respect to the position of the pyridyl-N atoms. All compounds were characterized by 1H NMR, UV–vis, fluorescence spectroscopy, electrospray ionization–mass spectrometry, and field-emission scanning electron microscopy measurements. In these structures, the intramolecular cooperative metal–ligand coordination of the 3-pyridyl nitrogen in SnP3 with axial ZnL and the π–π interactions between the adjacent porphyrin triad are the determining factors affecting the nanostructures of T3. Owing to the geometrical constraints of the SnP2 center, this type of interaction is not possible for T2. Therefore, only the π–π interactions affect the self-assembly process. In the case of SnP4, intermolecular coordinative interactions and then π–π interactions are responsible for the nanostructure of T4. The morphology-dependent photocatalytic degradation of methyl orange (MO) dye in aqueous solution under visible light irradiation was observed for these photocatalysts, and the degradation ratio of MO varied from 76 to 94% within 100 min. Nanorod-shaped T3 exhibited higher performance compared to nanosphere T2 and nanoflake T4.

Synthesis, characterization, and photocatalytic performance of methyl orange in aqueous TiO2 suspension under UV and solar light irradiation

Nano-crystalline titanium dioxide (TiO2) photocatalyst has been extensively utilized in the last few decades because of its strong oxidizing power, redox selectivity, and higher photocatalytic performance. In this work, TiO2 nanoparticle (NPs) was synthesized, characterized, and applied for the degradation of methyl orange (MO) dye in an aqueous solution under UV and solar light irradiations. The XRD results showed dominated anatase phase (82%) with a smaller crystalline size (18.23 nm). A rough surface with a uniform spherical shape was observed by SEM analysis. FTIR and UV–Vis/DRS spectroscopy confirmed the stretching vibration of the hydroxyl groups and higher absorption edge towards longer wavelength with smaller bandgap energy (3.12 eV) of TiO2 lattice structure. The activity of TiO2 NPs was carried out from the degradation of MO dye as a model contaminant for textile effluent in presence of UV/solar irradiation. The photodegradation efficiency of MO dye (15 mg L−1) was observed at 85.90% and 96.38% for 0.150 g and 0.030 g of TiO2 NPs at natural pH (7.0), after 5 h of UV and solar light irradiation. The respective rate constants were determined to be 0.0063 min−1 and 0.01 min−1 for UV and simulated solar light irradiation respectively, and exhibited the best-fitted kinetic model of pseudo-first-order. The photodegradation efficiency was increased with the decrease of pH, while efficiency decreased with an increase in initial dye concentration. The obtained result from TiO2 NPs was compared with commercially available Degussa P25 catalyst. The photocatalyst reusability test and reaction mechanism were also evaluated. The study suggests that TiO2 NPs are a promising photocatalyst that can be used for the degradation of organic dye compounds from textile wastewater towards the sustainable management of environment.

Enhanced photocatalytic activity in ferroelectric BiFeO3 nanoparticles treated by a corona poling method

BiFeO3 particles of about 50 nm were prepared by the sol-gel method with the calcination temperature of 450°C. The corona poling treatment was carried out on BiFeO3 nanoparticles for different electric fields and duration time. XRD analysis reveals that the BiFeO3 nanoparticles maintain the stable perovskite structure before and after the poling treatment. Raman and XRD analysis respectively show that the Bi–O bonds stretched and the lattice distorted for BiFeO3 nanoparticles with corona poling treatment. The poled BiFeO3 nanoparticles exhibit better photocatalytic kinetics in degradation of methyl orange (MO) dyes under the visible light irradiation for 3 h, which is about 5.1 times better relative to the BiFeO3 nanoparticles without the poling treatment. We conjecture that the enhanced internal electric fields produced by the corona poling process may be beneficial to the reduction of the combination of photogenerated electron-hole pairs resulting in the enhanced photocatalytic activity of BiFeO3 nanoparticles.

Photoelectrochemical properties and photocatalytic degradation of methyl orange dye by different ZnO nanostructures

Photoelectrochemical properties and photocatalytic degradation of methyl orange dye by different ZnO nanostructures

Revealing the Effect of MnO2, Activated Carbon and MnO2/Activated Carbon on Chitosan Polymer Host Fabricated Co NPs: Antibacterial Performance and Degradation of Organic Compounds.

MnO2 and MnO2 blended with 1 and 2 weight percent of activated carbon (AC), MnO2/AC1 and MnO2/AC2 were synthesized through the sol–gel method. The pure chitosan (CS) films were cast in the form of films. Similarly, 5 weight% of each MnO2, AC, MnO2/AC1 and MnO2/AC2 was intermingled with the CS to produce different films, such as CS-AC, CS-MnO2, CS-MnO2/AC1 and CS-MnO2/AC2. Zero-valent Co NPs were then supported on these films through the chemical reduction method and expressed as CS@Co, CS-AC@Co, CS-MnO2@Co, CS-MnO2/AC1@Co and CS-MnO2/AC2@Co NPs. All the catalysts were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) techniques. The synthesized catalysts were used as a dip catalyst against the hydrogenation of 4-nitrophenol (4NP), and for the degradation of methyl orange (MO) and Congo red (CR) dyes. The kapp and R2 values were deduced from pseudo-first-order kinetics for 4NP and MO and zero-order kinetics for CR dye. The kapp values of CS-AC@Co and CS-MnO2/AC1@Co NPs for 4NP hydrogenation were higher than those for any other member of the series, at 1.14 × 10−1 and 1.56 × 10−1 min−1 respectively. Similarly, the rate of CR degradation was highest with CS-AC@Co. The R2 values for 4NP, MO and CR dyes were above 0.9, which indicated that the application of pseudo-first- and zero-order models were appropriate for this study. Furthermore, the antibacterial activity of all the catalysts was evaluated against Pseudomonas aeruginosa and Escherichia coli. The CS-AC@Co NPs exhibited the highest zone of inhibition compared to other catalysts against P. aeruginosa, while all the catalysts were inactive against E. coli. This study reveals that the catalyst can be used for the degradation of other pollutants and for microbial inhibition.

Enhanced Photocatalytic Activity of ZnO Nanorods/(Graphene Oxide, Reduced Graphene Oxide) for Degradation of Methyl Orange Dye

ZnO has been well-known as a significant photocatalyst material due to its high surface area, efficient charge transport, and superior photosensitivity. Even though photocatalysis using bare ZnO NRs is useful in pollutant remediation, two main drawbacks scale down their performance as photocatalysts. First, ZnO NRs absorb mainly the UV light, which compromises a small portion of the solar spectrum, and second, the high recombination rate in the ZnO NRs prevents the path of electron-hole outward and then reduces the photocatalysis efficiency. In this work, ZnO-NRs, ZnO-NRs/Graphene Oxide (GO), and ZnO-NRs/Reduced Graphene Oxide (rGO) array composites were vertically grown on conductive glass substrates of SnO2:F (FTO). The films were synthesized by hydrothermal method using ZnO seed layers deposited by spray pyrolysis technique. The nanosheets of GO and rGO were anchored onto the surface of the as-prepared ZnO-NRs by using the spray deposition technique (SDT). The photocatalytic activity of these materials was studied by analyzing the degradation of methylene orange (MO) in an aqueous solution under ultraviolet light, and we found that the decoration of ZnO-NRs with nanosheets of GO and rGO resulted in a significant enhancement of the photocatalytic degradation efficiency, where ZnO-NRs/rGO are more efficient than ZnO-NRs/GO and the latter better than pure ZnO-NRs.