scholarly journals Enhanced Visible-Light Promoted Photocatalytic Activity of Mn3O4-based Photocatalysts in Removal of Methylene Blue

2021 ◽  
Author(s):  
Maryam Saket Osgouei ◽  
Navideh Kamrani ◽  
Massumeh Khatamian
Keyword(s):  
Methylene Blue ◽  
Diffuse Reflectance Spectroscopy ◽  
Organic Pollutant ◽  
Degradation Process ◽  
Precipitation Method ◽  
Small Shift ◽  
X Ray ◽  
Zeolite 4A ◽  
Xrd Patterns ◽  
Co Precipitation

Abstract In the present work, pure Mn3O4, Zirconium (Zr)-doped Mn3O4 and Samarium(Sm)-doped Mn3O4 were synthesized by the ultrasonic assisted co-precipitation method. In another step, zeolite 4A was prepared using a natural zeolite (clinoptilolite) by hydrothermal method. Subsequently, the synthesized zeolite 4A was utilized as an efficient support for immobilization of some of the obtained Mn3O4-based photocatalysts, thereby, nanocomposites of Mn(3-x) SmxO4 (x= 0.02)/Zeolite 4A and Mn(3-x) ZrxO4 (x= 0.02)/Zeolite 4A were synthesized. The characterization of the products was performed by exploiting X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-Ray Spectroscopy (EDX) and Diffuse Reflectance Spectroscopy analysis (DRS). The XRD patterns of the doped Mn3O4samples confirmed the formation of Hausmannite structure without any other impurities. By increasing of dopant content in the structure of Mn3O4, a small shift towards lower diffraction angles and a decreased intensity of the peaks in XRD patterns were detected validating the incorporation of dopant ions. Finally, methylene blue (MB) aqueous solution as an organic pollutant was used to study the photocatalytic performance of synthesized photocatalysts. Regarding the results, Mn(3-x) SmxO4 (x= 0.02)/Zeolite 4A nanocomposite and Mn(3-x) ZrxO4 (x= 0.1) nanoparticles exhibited the remarkable photocatalytic efficiency of 95. 5% and 98.4% in MB degradation process, respectively.

Photocatalytic Activity of Zeolite Supported Transition Metal-(Co2+ and Cr2+) Doped ZnO: Comparative Study

2015 ◽  
Vol 827 ◽  
pp. 43-48
Author(s):  
Annisa Noorhidayati ◽  
Mia Putri Rahmawati ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Transition Metal ◽  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Transition Metal Ions ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

Transition metal ions (Co and Cr) doped ZnO nanoparticles supported on natural zeolite were synthesized using co-precipitation method. The synthesized samples were characterized by means of X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and UV-visible diffuse reflectance spectroscopy. The samples were further used as photocatalyst for degradation of methyl orange and methylene blue in aqueous solutions under UV light irradiation. The results showed that zeolite supported Cr-doped ZnO nanoparticles is more efficient compared with zeolite supported Co-doped ZnO nanoparticles. It is also revealed that zeolite supported samples possessed higher photocatalytic efficiency compared to bare samples.

Investigation of Local Structure of ZnO with High Doping Copper Concentration (≥13 %mole) Prepared by Co-Precipitation Method

2021 ◽  
Vol 1028 ◽  
pp. 84-89
Author(s):  
Mohammad Syaiful Anwar ◽  
Kharisma Noor Afifah Supoyo ◽  
Retno Asih ◽  
Malik Anjelh Baqiya ◽  
Prae Chirawatkul ◽  
...  
Keyword(s):  
Local Structure ◽  
Parent Compound ◽  
Secondary Phase ◽  
Precipitation Method ◽  
Cu Doping ◽  
X Ray ◽  
Lattice Constants ◽  
Valence States ◽  
Xrd Patterns ◽  
Co Precipitation

Cu-doped ZnO (CZO) with Cu %mole of 0, 13, 14, and 15% have been synthesized by the co-precipitation method with controlled pH at 9. The diffraction pattern of CZO shows that a single phase of ZnO with wurtzite structure (w-ZnO) was achieved in the parent compound. In contrast, small fractions of the secondary phase of CuO monoclinic (m-CuO) were identified in the doped compounds. Rietveld-refinement on the X-Ray Diffraction (XRD) patterns reveals that the crystallite size of CZO is estimated in the range of 84 - 148 nm with instrumental correction factor and that CZO14 exhibits the most considerable fraction of m-CuO among the samples. Interestingly, lattice constants decrease by Cu doping. The effects of Cu doping on the valence state and the local structure were investigated by X-Ray Absorption Spectroscopy (XAS). Based on our analysis on both Cu K-edge and Zn K-edge XANES spectra, oxidation states of Cu and Zn ions are about +2 with no evidence of other valence states. Cu atom is likely to incorporate into wurtzite crystal lattice by occupying Zn sites in a small portion, and the doped compounds create a few oxygen vacancies.

Photocatalytic Degradation of Methylene Blue and Methyl Orange with Fe-Doped ZnO Nanoparticles Modified with Natural Zeolite and Montmorillonite: Comparative Study

2015 ◽  
Vol 1123 ◽  
pp. 295-302 ◽  
Author(s):  
Nur Afifah ◽  
Siti Adriani ◽  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Natural Zeolite ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
Resonance Spectroscopy ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation

The present study compares the photocatalytic decolorization ability of Fe-doped ZnO modified both natural zeolite and montmorillonite towards aqueous solution of organic dyes such as methylene blue and methyl orange under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray, Fourier-transform infrared absorption, and electron spin resonance spectroscopy. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to natural zeolite.

Decolorization of Methylene Blue by Photocatalyst in the Ag3PO4-AgI System

2014 ◽  
Vol 970 ◽  
pp. 29-32 ◽  
Author(s):  
Pongsaton Amornpitoksuk ◽  
Sumetha Suwanboon
Keyword(s):  
Methylene Blue ◽  
Mixed Phase ◽  
Photocatalytic Properties ◽  
Precipitation Method ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Co Precipitation

The co-effect of PO43- and I- on the formation of a heterosturucture photocatalyst in the Ag3PO4-AgI system was studied by the co-precipitation method between AgNO3 and the precipitating agent. The precipitating agent was prepared by varying the mole ratios between Na2HPO4 and KI. At 10 mol.% KI, the product showed the mixed phase between Ag3PO4 and un-identified phase. For 30 - 90 mol.% KI, the un-identified phase and AgI were detected in the x-ray diffraction patterns. The un-identified phase strongly adsorbed the methylene blue dye. The product prepared from 30 mol.% KI had the highest content of un-identified phase and also showed the highest degree of decolorization in the dark. The photocatalytic properties of products in this system were confirmed by the decolorization of methylene blue under visible illumination.

scholarly journals Structural Analysis using X-Ray Diffraction and FTIR Spectroscopic Studies on Mn2+ Substituted CaWO4 Materials Synthesized by Coprecipitation Method

2019 ◽  
Vol 32 (1) ◽  
pp. 49-52
Author(s):  
M. Jaganadha Rao ◽  
K.S.R. Murthy ◽  
Ch. Ravi Shankar Kumar ◽  
Anjali Jha ◽  
G.S.V.R.K. Choudary ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Point Group ◽  
Size Composition ◽  
Spectroscopic Studies ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Synthesis Of Materials

Present day technology requires synthesis of materials with low energy consumption, free mercury pollution and its reliability. A novel material with control of crystallite size, composition and simple for white light relies in synthesis of materials. The present focus of article attributes series of manganese doped Ca1-xMnxWO4 luminescent materials with co-precipitation method. Reported studies attempts with change in structure of calcium tungstate (CaWO4) are observed with dopants like Eu3+, Eu2+, Tb3+, etc. However the effect of Mn2+ on structural properties of CaWO4 are quite interesting. The synthesized samples were characterized with X-ray diffraction for lattice parameters, crystallite size and FTIR studies for bonding mechanism of O-W-O stretching and W-O-W bridge bond. Rietveld profile refinement of XRD patterns using MAUD program Ca1-xMnxWO4 revealed the Scheelite type structure with C4h point group and I41/a space group. Characterization studies reveal that doping of Mn2+ doping upto 0.1 in place of Ca2+ will not change the phase of Scheelite structure.

scholarly journals Structural, Optical and Photocatalytic Properties of PEG Assisted CdO Nanoparticles by Co-Precipitation Method

2019 ◽  
Vol 31 (10) ◽  
pp. 2222-2228
Author(s):  
M. Elayaraja ◽  
I. Kartharinal Punithavathy ◽  
S. Johnson Jeyakumar ◽  
M. Jothibas
Keyword(s):  
Methylene Blue ◽  
Cadmium Oxide ◽  
Chemical Precipitation ◽  
Band Gap Energy ◽  
Precipitation Method ◽  
Average Crystalline Size ◽  
X Ray ◽  
Band Area ◽  
Cdo Nanoparticles ◽  
Co Precipitation

A simple and modified chemical precipitation method is used for synthesis of different PEG assisted cadmium oxide nanoparticles. The prepared products were characterized by X-ray diffraction, Fourier transform infrared, ultraviolet, scanning electron microscopy and energy dispersive X-ray analysis. The XRD patterns revealed the cubic phases and calculated particle sizes are 36.42, 34.27, 33.54 and 35.21 nm for pure CdO with 2, 4 and 6 % PEG nanoparticles respectively, From these results, it can be observed that the average crystalline size decreases with increasing PEG concentration. The functional groups and band area of the product were established by FT-IR spectroscopy. The band gap energy of CdO nanoparticles increased from 2.54 to 2.94 eV by increasing PEG concentration .The surface morphology and element composition have been confirmed form SEM with EDX analysis. In addition, the photocatalytic performance of PEG assisted CdO nanoparticles with methylene blue indicated that the CdO can be utilized a good photocatalyst for degradation of methylene blue.

The Influence of Montmorillonite Incorporation in Mn-Doped ZnO Nanoparticles for Photocatalytic Degradation of Organic Dyes

2015 ◽  
Vol 1112 ◽  
pp. 194-200
Author(s):  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Zno Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Organic Dyes ◽  
Uv Light ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Mn Doped

The present study compares the photocatalytic decolorization ability of bare Mn-doped ZnO and montmorillonite modified Mn-doped ZnO nanoparticles towards aqueous solution of organic dyes (methylene blue and malachite green) under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, electron spin resonance, and diffuse reflectance spectroscopy. Comparison of degradation efficiency demonstrated that montmorillonite modified Mn-doped ZnO nanoparticles exhibited higher activity than bare Mn-doped ZnO nanoparticles.

Kinetics and Adsorption Model of Methylene Blue on [email protected] Nanoplate Composite

2021 ◽  
Author(s):  
Le Manh Cuong ◽  
Bui Hoang Duc ◽  
Pham Van Thang ◽  
Nguyen Thi Tuyet Mai ◽  
Huynh Dang Chinh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Room Temperature ◽  
Diffuse Reflectance Spectroscopy ◽  
Orthorhombic Phase ◽  
Precipitation Method ◽  
Blue Dye ◽  
Adsorption Model ◽  
X Ray ◽  
Composite Adsorbents ◽  
Generation Activity

[email protected] nanoplate composite adsorbents were prepared in a simple acid precipitation method at room temperature. The [email protected] nanoplate composite adsorbents were characterized by X-ray powder diffraction, micro-Raman spectroscopy, Fourier transform infrared spectra, scanning electron microscopy and UV-vis diffuse reflectance spectroscopy. The results show that the orthorhombic-phase WO3.H2O nanoplates with dimensions of [Formula: see text][Formula: see text]nm3 were successfully composited with g-C3N4. The methylene blue dye generation activity of these adsorbents was evaluated. The kinetics and absorption model of [email protected] nanoplate composite adsorbents were further studied.

STRUCTURE, MORPHOLOGICAL, MAGNETIC AND OPTICAL PROPERTIES OF CuxMg1-xFe2O4 (x = 0, 0.5, 1) NANO FERRITES SYNTHESIZED BY CO-PRECIPITATION METHOD

2021 ◽  
pp. 46-54
Author(s):  
Chinh
Keyword(s):  
Saturation Magnetization ◽  
Spinel Structure ◽  
Single Phase ◽  
Secondary Phase ◽  
Ferromagnetic Material ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Patterns ◽  
Co Precipitation

CuxMg1.xFe2O4 nanoparticles were successfully synthesized by co-precipitation. The samples were calcined at 900 oC for 3 h and X-ray diffraction analysis showed that Cu0.5Mg0.5Fe2O4 had a single phase cubic spinel structure, while formation of secondary phase of Fe2O3 was observed in XRD patterns of CuFe2O4, MgFe2O4. The saturation magnetization (Ms) of Cu0.5Mg0.5Fe2O4 is in between the saturation magnetization values of CuFe2O4 and MgFe2O4 nanoparticles, CuFe2O4 is a ferromagnetic material, while MgFe2O4 and Cu0.5Mg0.5Fe2O4 show superparamagnetic behavior. The synthesized spinel ferrites were fully characterized using scanning electron microscopy (SEM), FTIR spectroscopy, energy dispersive spectroscopy (EDS) and UV-vis spectrophotometry.

Comparative Study on Photocatalytic Performance of (La,Fe) and (Ce,Fe)-Codoped ZnO Nanoparticles

2015 ◽  
Vol 827 ◽  
pp. 31-36 ◽  
Author(s):  
Nadia Febiana Djaja ◽  
Rosari Saleh
Keyword(s):  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Congo Red ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ammonium Oxalate ◽  
Butyl Alcohol ◽  
Precipitation Method ◽  
X Ray

The present study evaluates the photocatalytic degradation of congo red as a model of organic pollutant over LaFe- and CeFe-codoped ZnO nanoparticles under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, diffuse reflectance spectroscopy. The photodegradation efficiency of congo red using two 20W UV lamp was higher for LaFe-codoped ZnO nanoparticles compared with CeFe-codoped ZnO nanoparticles. Photocatalytic mechanism was investigated by measuring the photocatalytic degradation rate in the presence of ammonium oxalate, natrium sulfate, tert-butyl alcohol as photogenerated holes, photogenerated electrons and hydroxyl radical species scavenger. The results revealed that electrons are the main species in the photocatalytic process.

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