scholarly journals Synthesis and Characterization of Chitosan-Polyaniline-Manganese Dioxide Nanocomposite for Removal of Methyl Orange Dye

2021 ◽  
Vol 33 (3) ◽  
pp. 671-676
Author(s):  
B.R.S. Rathore ◽  
N.P.S. Chauhan ◽  
M.K. Rawal ◽  
S.C. Ameta ◽  
R. Ameta
Keyword(s):  
Electron Microscopy ◽  
Methyl Orange ◽  
Manganese Dioxide ◽  
Oxygen Demand ◽  
Batch Adsorption ◽  
Significant Shift ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Transmission Electron ◽  
Methyl Orange Dye

An ecofriendly polymer composite based on chitosan, polyaniline and manganese dioxide has been prepared using batch adsorption method and analyzed by Fourier transform infrared (FTIR), UV-vis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). FTIR results suggested the presence of functional groups like hydroxyl and amino groups and also shown a significant shift in IR bands in CS-PANI-MnO2 composite. The surface of composite was quite rough within the folds of pleated regions as observed from the SEM and TEM morphologies. The prepared composite was also utilized as an adsorbent for the treatment of methyl orange from the aqueous solution and achieved a reasonably good adsorption capacity of 96.2%. The biochemical oxygen demand (BOD) and chemical oxygen demand (COD) tests also suggested their suitability for the adsorption of methyl orange dye.

scholarly journals Characterization of algae residue biochar and its application in methyl orange wastewater treatment

2021 ◽  
Author(s):  
Hao Zhu ◽  
Haiming Zou
Keyword(s):  
Electron Microscopy ◽  
Methyl Orange ◽  
Raw Material ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Adsorption Effect ◽  
Transmission Electron ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Methyl Orange Dye

Abstract In this work, Spirulina residue was used as the raw material to prepare different biochars by changing the pyrolysis time. Moreover, the obtained products were characterized by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction energy spectrum. This experiment used the batch adsorption method to study the adsorption effect of pH, dosage, and pyrolysis time on methyl orange. The adsorption of methyl orange onto Spirulina residue biochar fitted with the Langmuir isotherm model and pseudo-second-order kinetics. The results showed that the surface functional groups of Spirulina residue biochar obtained by dry pyrolysis were abundant, and it can effectively adsorb methyl orange dye in an aqueous solution. The sample prepared at 500 °C for 5 h had the best adsorption effect on methyl orange. The change of pyrolysis time will affect the physicochemical properties of biochar from Spirulina residue, thereby affecting its adsorption effect on methyl orange dye. The analysis showed that the chemical adsorption of Spirulina residue biochar on methyl orange might be the primary way of dye removal. The results can provide a reference for preparing biochar from algae residue and biochar application in the removal of dye wastewater.

Photocatalytic Degradation of Methyl Orange Dye with Synthesized Chitosan/Fe2O3Nanocomposite and its Isotherm Studies.

2020 ◽  
Vol 16 ◽  
Author(s):  
Nimisha Jadon ◽  
Gulzar Ahmad Bhat ◽  
Manoharmayum Vishwanath Sharma ◽  
Harendra Kumar Sharma
Keyword(s):  
Methyl Orange ◽  
Dye Degradation ◽  
Dose Effect ◽  
X Ray Diffraction ◽  
Methyl Orange Degradation ◽  
Transmission Electron ◽  
Fourier Transformation Infrared Spectroscopy ◽  
Vis Spectroscopy ◽  
Methyl Orange Dye ◽  
Degradation Of Methyl Orange

Background: The study focuses on the synthesis of chitosan/ Fe2O3 nanocomposite, its characterization and application in methyl orange dye degradation. Methods: The synthesized chitosan/ Fe2O3 nanocomposite was characterized with Powder X-Ray Diffraction, Fourier Transformation Infrared Spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and UV-Vis Spectroscopy. Results: The characterization showed that the Fe2O3nanoparticles were embedded in the polymer matrix of chitosan. The size of the Fe2O3nanoparticles were less than 10nm and the crystallite size was 1.22 nm.The synthesized chitosan/ Fe2O3nanocomposite was tested for methyl orange degradation using different parameters such as effect of contact time, effect of dose, effect of concentration and effect of pH for the degradation of methyl orange dye in aqueous solution.The Fruendlich, Langmuir and Temkin isotherm studies were also conducted for adsoption of methyl orange on Chitosan/ Fe2O3nanocomposite. Conclusion: The study indicated that the synthesized chitosan/Fe2O3 nanocomposite had the potential of degrading methyl orange dye up to 75.04% under the set condition in this experiment which indicate that Chitosan/ Fe2O3 nanocomposite is a viable option that can be used for the degradation of methyl orange dye.

scholarly journals Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

2016 ◽  
Author(s):  
Syed Shahabuddin ◽  
Norazilawati Muhamad Sarih ◽  
Muhammad Afzal Kamboh ◽  
Hamid Rashidi Nodeh ◽  
Sharifah Mohamad
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Polymerization Method

The present investigation highlights the synthesis of polyaniline (PANI) coated graphene oxide doped with SrTiO3 nanocube nanocomposites through facile in-situ oxidative polymerization method for the efficient removal of carcinogenic dyes, namely, the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). The synthesised nanocomposites were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adsorption efficiencies of graphene oxide (GO), PANI homopolymer and SrTiO3 nanocubes-doped nanocomposites were assessed by monitoring the adsorption of methylene blue and methyl orange dyes from aqueous solution. The adsorption efficiency of nanocomposites doped with SrTiO3 nanocubes were found to be of higher magnitude as compared with undoped nanocomposite. Moreover, the nanocomposite with 2 wt% SrTiO3 with respect to graphene oxide demonstrated excellent adsorption behaviour with 99% and 91% removal of MB and MO respectively, in a very short duration of time.

scholarly journals Comparative hydrogenation of the sunflower oil on platinum and nickel catalysts

2017 ◽  
pp. 4-13
Author(s):  
Kainaubek Toshtay ◽  
Ali Auyezov ◽  
Christophe Geantet
Keyword(s):  
Electron Microscopy ◽  
Platinum Catalyst ◽  
Solid Fat Content ◽  
Nickel Catalysts ◽  
Ni Catalyst ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Supported Platinum ◽  
Transmission Electron ◽  
Hydrogenation Reactions

The paper considers the diatomite-supported platinum catalyst (1.0 wt% Pt/D) synthesized using colloid adsorption method. The catalyst was characterized by X-ray diffraction, N2 adsorption (BET), scanning electron microscopy and transmission electron microscopy. The activity of the platinum catalyst was investigated by sunflower hydrogenation at 0.5 MPa hydrogen pressure at temperature range from 90°C to 130°C and compared to a commercial Ni catalyst. All of the hydrogenation reactions were terminated at iodine value between approximately 72-86. The results demonstrated that Pt/diatomite catalyst exhibited the highest activity and selectivity at low temperature than the Ni catalyst in hydrogenation processes. Physical characteristics of hydrogenated products such as melting point and solid fat content were also examined.

scholarly journals Synthesis and Characterization of Birnessite and Cryptomelane Nanostructures in Presence of Hoffmeister Anions

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Marcos A. Cheney ◽  
Robin Jose ◽  
Arghya Banerjee ◽  
Pradip K. Bhowmik ◽  
Shizhi Qian ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Manganese Dioxide ◽  
Chloride Ion ◽  
Reduction Reaction ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Transmission Electron ◽  
Xrd Patterns

The effect of Hoffmeister anions , , and on the structure and morphology of birnessite and cryptomelane-type manganese dioxide nanostructures, produced by the reduction reaction of and in aqueous acidic media, was studied. The syntheses were based on the decomposition of aqueous in presence of HCl for birnessite-type and acidified for cryptomelane-type manganese dioxide under soft hydrothermal conditions. They were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) techniques. XRD patterns show the formation of birnessite for the first synthesis and a mixture of cryptomelane and birnessite-types for the second synthesis. XRD data revealed that the Hoffmeister anions have a significant effect on the nanostructures of birnessite. The sulphate ion-treated birnessite has the smallest crystals, whereas the chloride ion-treated birnessite has the largest crystals. Their TEM and HRTEM studies revealed a transformation from nanoplatelet morphology for chloride-treated samples to nanofibrous morphology for sulphate-treated birnessite. For the cryptomelane nanostructures, Hoffmeister anions also show a profound effect on their crystalline structures as determined by XRD analyses revealing a transformation of the cryptomelane phase to birnessite phase of . This transformation is also supported by TEM and HRTEM studies.

Preparation and Photocatalytic Activity Research of Hollow Cubic TiO2 Particles

2011 ◽  
Vol 356-360 ◽  
pp. 558-564
Author(s):  
Xiao Wei Yuan ◽  
Xue Guo ◽  
Dan Dan Yang ◽  
Li Juan Wang ◽  
Mei Ling Cheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Property ◽  
Methyl Orange Solution ◽  
Tetrabutyl Titanate ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Orange Solution

Hollow cubic TiO2particles were synthesized using cubic Cu2O particles as hard templates, and the hydrolysis of tetrabutyl titanate (TBOT). The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis spectrometer, respectively. The results show that the prepared TiO2is composed of anatase TiO2, and has a stronger absorption in the range of 300-400nm wavelengths in its UV-Vis spectroscopy. Experiments were carried out using a methyl orange solution as a model to evaluate the photocatalytic activity of hollow cubic TiO2particles. The effects of catalyst dosage, initial concentration and pH of methyl orange solution on the degree of photodegradation have been investigated. It’s found that the hollow cubic TiO2particles have a good photocatalytic property. And the degradation rate of the methyl orange, after methyl orange solution (5mg/L) containing hollow cubic TiO2particles (0.5g/L) is irradiated by 125W ultraviolet light for 120 minutes, is 95%.

Sunlight-Driven Photocatalytic Degradation of Methyl Orange Based on Bismuth Ferrite (BiFeO3) Heterostructures Composed of Interconnected Nanosheets

2020 ◽  
Vol 20 (3) ◽  
pp. 1851-1858 ◽  
Author(s):  
S. Ruby ◽  
D. Rani Rosaline ◽  
S. S. R. Inbanathan ◽  
K. Anand ◽  
G. Kavitha ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Organic Contaminants ◽  
Bismuth Ferrite ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Perovskite Crystal ◽  
Hazardous Pollutants

Herein, we report the facile microwave-assisted synthesis, characterization and photocatalytic degradation applications of Bismuth ferrite heterostructures composed of interconnected nanosheets (BHNs). The synthesized materials were subjected to several analytical studies such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy and UV-visible spectroscopy in order to examine the morphological, structural, optical and photo catalytic properties. The structural and morphological characterizations confirmed the rhombohedral perovskite crystal structure and the formation of heterostructures composed of interconnected nanosheets for the synthesized material. The compositional characterization revealed that the synthesized material is bismuth ferrite with high purity. The BHNs were further used as efficient photocatalyst for the photocatalytic degradation of highly hazardous pollutant methyl orange under sunlight irradiation. The sunlight driven photocatalytic experiments revealed ~86% photodegradation of methyl orange dye in 150 min. The presented work revealed that the synthesized BHNs are excellent material for the photocatalytic degradation of various organic contaminants and hazardous pollutants.

Methyl Orange Adsorption onto Magnetic Fe3O4/Carbon (AC, GO, PGO) Nanocomposites

2021 ◽  
Vol 21 (11) ◽  
pp. 5756-5764
Author(s):  
Glemarie C. Hermosa ◽  
Chien-Shiun Liao ◽  
Sea-Fue Wang ◽  
Aidan An-Cheng Sun
Keyword(s):  
Graphene Oxide ◽  
Electron Microscope ◽  
Methyl Orange ◽  
Adsorption Capacity ◽  
Batch Adsorption ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Effective Removal ◽  
Infrared Spectrometer ◽  
Pseudo Second Order

In this study, carbonaceous nanomaterials (Activated Carbon (AC), Graphene Oxide (GO) and Porous Graphene Oxide (PGO)) were synthesized and attached to Fe3O4 magnetic powder for the effective removal of synthetic Methyl Orange (MO). AC and GO were successfully conjugated with Fe3O4 whilst PGO was not due to its surface functional groups. The morphology and chemical structure of the Fe3O4/Carbon nanocomposites were characterized by the N2 adsorption, Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM) and Vibrating sample magnetometer (VSM). Batch adsorption experiments were performed and showed significant removal efficiency of 90% at the first ten minutes for Fe3O4/AC nanocomposite. Analysis of adsorption equilibrium revealed that AC/Fe3O4 is well fitted with Langmuir model, a homogeneous adsorption having an adsorption capacity of 270 mg/g. The GO/Fe3O4 can fit with both Langmuir and Freundlich models indicating multilayer adsorption on the surface of the adsorbent with an adsorption capacity of 81.9 mg/g. In the case of adsorption kinetics, both adsorbents follow the pseudo second order kinetics model showing high F?2 values. Both adsorbents demonstrated advantageous superparamagnetic properties for their easy recovery from aqueous solutions and prospective applications to toxic removal in water and wastewater.

A Novel CuO-TiO2 Composite Photocatalyst and its Degradation of Methyl Orange under UV Irradiation

2011 ◽  
Vol 295-297 ◽  
pp. 1129-1132 ◽  
Author(s):  
Shi De Wu ◽  
You Qi Zhu ◽  
Chao Li ◽  
Ying Liang Wei
Keyword(s):  
Electron Microscopy ◽  
Methyl Orange ◽  
Uv Light ◽  
Sol Gel ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Degradation Of Methyl Orange

A novel CuO-TiO2 composite photocatalyst was prepared by a redox process coupling with sol-gel method. The morphology and structure of the as-prepared samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Photocatalytic activity of the CuO-TiO2 composite photocatalyst was evaluated in terms of the degradation of Methyl orange (MO) in aqueous solution under UV light irradiation. The results show that the as-prepared composite consisted of monoclinic-phase CuO-nanotubes and TiO2 nanoparticles, in which TiO2 nanoparticles were dramatically decorated on the CuO-nanotubes, exhibits a high catalytic activity to decolorize MO. According to the experimental results, 1.27wt % was the optimal loading for CuO-doped TiO2 photocatalyst.

scholarly journals Synthesis, Characterization, and Catalytic Properties of Magnetic Fe3O4@FU: A Heterogeneous Nanostructured Mesoporous Bio-Based Catalyst for the Synthesis of Imidazole Derivatives

2020 ◽  
Vol 8 ◽  
Author(s):  
Maryam Banazadeh ◽  
Sara Amirnejat ◽  
Shahrzad Javanshir
Keyword(s):  
Electron Microscopy ◽  
Reaction Times ◽  
Sulfated Polysaccharide ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Environmental Friendliness ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir

In this protocol, Fucoidan (FU), a fucose-rich sulfated polysaccharide extracted from brown algae Fucus vesiculosus was used for in situ preparation of magnetic Fe3O4@FU. Nanoco magnetic properties of Fe3O4@FU were investigated by energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) adsorption method, and vibrating sample magnetometer (VSM). The catalytic activity of Fe3O4@FU was employed for the synthesis of tri- and tetra-substituted imidazoles through three- and four-component reactions respectively, between benzyl, aldehydes, NH4OAc and benzyl, aldehydes, NH4OAc, and amine under reflux in ethanol. It is worth nothing that excellent yields, short reaction times, chromatography-free purification, and environmental friendliness are highlighted features of this protocol.

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