scholarly journals Adsorption of Congo Red on Pb doped FexOy: experimental study and theoretical modeling via double-layer statistical physics models

2021 ◽  
Author(s):  
Umesh Fegade ◽  
Sachin Kolate ◽  
Rajesh Dhake ◽  
Inamuddin ◽  
Tariq A. Altalhi ◽  
...  
Keyword(s):  
Double Layer ◽  
Congo Red ◽  
Statistical Physics ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Double Layer Model ◽  
Physics Model ◽  
Co Precipitation ◽  
Average Size

Abstract Size-controlled Pb0.06Fe0.7O3 nanoparticles (Pb-FeONPs) werefabricated by the thermal co-precipitation method and characterized by FE-SEM, EDX, XRD, and IR techniques. The SEM and XRD images showed the average size distribution and average crystallite size of 19.21 nm and 4.9 nm, respectively. The kinetic model of congo red (CR) adsorption onto Pb-FeONPs was verified and found to bea pseudo-second-order reaction. The Langmuir plot best fitted (R2 = 0.990) than other isotherm models with a Qmax (mg/g) of 500 for congo red (CR) dye in 40 min. The double-layer statistical physics model based on two energies was used to calculate the significant parameters. The n (Stoichiometric coefficient) values obtained from the statistical physics double-layer model were found to be 0.599, 0.593, and 0.565 which are less than 1, indicating the multi-docking process. The regeneration of Pb-FeONPs was used upto 5 cycles effectively, making the material highly economical. The Pb-FeONPs were fruitfully applied for the removal of CR dye from wastewater on a laboratory and industrial scale.

XRD and Photoluminescence Properties of CaSO4:Dy Phosphor Synthesized by New Co-Precipitation Method

2017 ◽  
Vol 888 ◽  
pp. 333-337 ◽  
Author(s):  
Nadira Kamarudin ◽  
Wan Saffiey Wan Abdullah ◽  
Muhammad Azmi Abdul Hamid
Keyword(s):  
Calcium Sulfate ◽  
Average Crystallite Size ◽  
Information Storage ◽  
Precipitation Method ◽  
Photoluminescence Properties ◽  
Orthorhombic Crystal ◽  
Phosphor Material ◽  
X Ray ◽  
Wide Range ◽  
Co Precipitation

This paper presents the luminescence properties of dysprosium (Dy) doped calcium sulfate (CaSO4) phosphor material produced by co-precipitation technique with 0.1 - 0.5 mol% concentration of dopant. The crystallinity of the produced powder was studied using x-ray powder diffraction (XRD). The XRD spectrum shows high purity anhydrite CaSO4 phosphor material produced. The average crystallite size of 74 nm with orthorhombic crystal system was obtained. The luminescence behavior of produced CaSO4: Dy was studied using a photoluminescence (PL) spectrometer. The excitation and emission spectrum peaks associated with defects and vacancies of the phosphor material at claimed crystalline phase. The mixed peaks of excitation and emission that corresponds to micro and nano sized particle was shown for the produced powders. These properties show that the produced powders have wide range of luminescence detection with many electron traps ready for thermoluminescence (TL) information storage.

Preparation and Characterization of Nanocrystalline CaO-ZrO2 Powders by Microwave Pyrolysis

2014 ◽  
Vol 602-603 ◽  
pp. 97-100
Author(s):  
Bing Bing Fan ◽  
Ke Ke Guan ◽  
Hao Chen ◽  
Xiao Xuan Pian ◽  
Chen Yang Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Reaction Temperature ◽  
Pyrolysis Temperature ◽  
Precipitation Method ◽  
Microwave Pyrolysis ◽  
Model Chamber ◽  
Co Precipitation ◽  
Average Size

CaO(15%)-ZrO2nano-powders were prepared by microwave pyrolysis in a multi-model chamber at the temperature ranging from 650°C to 800°C, with the precursor processed at different reaction temperature from 0°C to 80°C by chemical co-precipitation method. XRD and SEM techniques were used to characterize the phase transition and micrograph of powders. It is found that the content of m-ZrO2phase decreased with the increasing of reaction temperature and pyrolysis temperature. The high dispersed and superfine nano-powders were obtained at the pyrolysis temperature of 750°C for 20 min at 80°C. And only cubic ZrO2phase were detected in CaO (15%)-ZrO2powders and the average size of the powders is about 41 nm.

scholarly journals Structural Stability of Ni/Al Layered Double Hydroxide Supported on Graphite and Biochar Toward Adorption of Congo Red

2021 ◽  
Vol 6 (2) ◽  
pp. 85-95
Author(s):  
Patimah Mega Syah Bahar Nur Siregar ◽  
Neza Rahayu Palapa ◽  
Alfan Wijaya ◽  
Erni Salasia Fitri ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Layered Double Hydroxide ◽  
Congo Red ◽  
High Performance ◽  
Precipitation Method ◽  
First Order ◽  
Xrd Diffraction ◽  
Co Precipitation ◽  
Double Hydroxide

In this research, Ni/Al layered double hydroxide (LDH) was modified by using co-precipitation method to generate Ni/Al-graphite (Ni/Al-GF) and Ni/Al-biochar (Ni/Al-BC). The adsorbents were applied to remove Congo Red from aqueous solution. The obtained samples were characterized by using XRD, FTIR, BET and TG-DTA. The XRD diffraction pattern of Ni/Al LDH, Ni/Al-GF, and Ni/Al-BC presented the formation of composite with decreasing crystallinity. The surface area modified LDHs was higher than the pristine materials, which was obtained 15.106 m2/g, 21.595 m2/g and 438.942 m2/g for Ni/Al-LDH, Ni/Al-GF, Ni/Al-BC respectively. The adsorption of Congo Red on the materials was tested at diferent parameters and the results exhibited that Congo Red adsorption on LDHs were pseudo-first-order (PFO) kinetic, spontaneous, endothermic and followed Langmuir model. The adsorbents removed Congo Red by high performance stability with adsorption capacity was 116.297 mg/g for Ni/Al-GF and 312.500 mg/g for Ni/Al-BC. These adsorption capacity was higher than the pristine LDH (61.728 mg/g). The regeneration process which carried out for five cycles showed that Ni/Al-GF and Ni/Al-BC have stable structures as reuse adsorbents for Congo Red from aqueous solution.

scholarly journals Synthesis of BaTi5O11 by an aqueous co-precipitation method via stable organic titanate precursor

2021 ◽  
pp. 14-14
Author(s):  
Pelin Aktaş
Keyword(s):  
Aqueous Media ◽  
Average Crystallite Size ◽  
Phase Evolution ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Ft Ir ◽  
Scherrer Formula ◽  
Co Precipitation

BaTi5O11 has been widely researched due to its unique microwave properties. Conventionally it is challenging to obtain this compound as a single phase. The BaTi5O11 was synthesized via co-precipitation technique using an aqueous solution of titanium(IV)(triethanolaminato) isopropoxide, barium nitrate and ammonia as precursors which are stable in an aqueous media. The phase evolution, purity, and structure were identified by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectroscopy analysis. The desired BaTi5O11 structure was obtained by calcination at 900?C. Furthermore, the structure is characterized by TGA, FT-IR and Raman studies. The study showed that the particles were between 80 and 120 nm in size and the average crystallite size was determined from the Scherrer formula as 68.1 nm at 900?C.

Effect of Magnetic Magnetite (Fe3O4) Nanoparticle Size on Arsenic (V) Removal from Water

2021 ◽  
Vol 21 (4) ◽  
pp. 2576-2581
Author(s):  
N. T. T. Thao ◽  
D. H. Nguyen ◽  
Pham The Kien ◽  
Thanh-Tung Duong ◽  
Nguyen Thi Kim Lien ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Absorption Efficiency ◽  
Precipitation Method ◽  
Water And Wastewater Treatment ◽  
Ion Removal ◽  
Magnetite Fe3o4 ◽  
Isotherm Adsorption ◽  
Water And Wastewater ◽  
Co Precipitation ◽  
Average Size

Magnetic magnetite (Fe3O4) nanoparticles with average sizes of 5.11, 10.53, and 14.76 nm were synthesized by the chemical co-precipitation method. The surface area of Fe3O4 nanoparticles (average size of 5.11 nm) had the largest value of 167 m2/g. The adsorption capacity for removing arsenic (As(V)) from water at 3 ppm concentration was investigated by atomic absorption spectroscopy. Results showed that the As(V) adsorption capacity of Fe3O4 was dependent on particle size. The maximum absorption efficiency (Hmax) reached 99.02%, the equilibrium time was 30 min; the maximum Langmuir isotherm adsorption capacity was 14.46 mg/g with Fe3O4 nanoparticle an average size of 5 nm. The results indicate that reducing the size of Fe3O4 nanoparticles is a promised way for As(V) ion removal from water and wastewater treatment.

Cobalt Metal ion Doped Cerium Oxide (Co-CeO2) Nanoparticles Effect Enhanced Photocatalytic Activity

MRS Advances ◽  
2020 ◽  
pp. 1-13
Author(s):  
G. Killivalavan ◽  
B. Sathyaseelan ◽  
G. Kavitha ◽  
I. Baskarann ◽  
K. Senthilnathan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Metal Ion ◽  
Chemical Properties ◽  
Visible Spectrum ◽  
Average Crystallite Size ◽  
Cobalt Metal ◽  
Uv Visible ◽  
Co Precipitation ◽  
Average Size ◽  
Physical And Chemical

Abstract The REE (rare-earth-elements) cerium (Ce) is the most abundant earth-crust element and their oxides have great attention in the form of nanocrystalline nature with superior physical and chemical properties. Pure and Co (1%, 3% and 5%) doped CeO2 nanoparticles (NPs) synthesized by co-precipitation technique were characterized through X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-visible spectroscopy. XRD shows face-centred-cubic (FCC) crystal symmetry with average crystallite size 6–12 nm. HRTEM exhibits almost identical cubical shaped particles with average size 4–10 nm. Tuned band-gap may be observed from UV-visible spectrum of CeO2-NPs upon Co (1%, 3% & 5%) incorporation. Enhancement of the photocatalytic activity observed for Co-doped (1%, 3% & 5%) to the degradation of methylene-blue (MB) dye under visible-light absorption.

Immobilization of Salicylic Acid on Ni-Zn Layered Hydroxide Salts

2020 ◽  
Vol 840 ◽  
pp. 566-572
Author(s):  
Muhammad Robith Tahta Amnillah ◽  
Suyanta Suyanta ◽  
Sri Juari Santosa
Keyword(s):  
Salicylic Acid ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
Precipitation Method ◽  
Isotherm Models ◽  
Basal Spacing ◽  
X Ray ◽  
Dependent Property ◽  
Ph Range ◽  
Co Precipitation

Ni-Zn Layered hydroxide salt (Ni-Zn LHS) has been synthesized from equimolar Ni(NO3)2 and Zn(NO3)2 by co-precipitation method using NaOH. The formation of layered assembly is confirmed in X-ray diffractogram, i.e. by the appearance of peaks at 2θ: 9.60°, 19.40°, 33.48°, and 59.76° which corresponds to diffraction plane (001), (003), (020), and (040), respectively. The synthesized Ni-Zn LHSs possessed the point of zero charge (pHpzc) at pH 8 and nitrate as the interlamellar ion. The incorporation of salicylic acid into LHS can extend the property of LHS as a reductive adsorbent in the application of metal recovery. The immobilization of salicylic acid on the Ni-Zn-LHS was successfully done and indicated the strong pH-dependent property. The immobilization of salicylic acid on Ni-Zn LHSs was optimum at pH 7 and followed better the Langmuir than Freundlich isotherm models with immobilization capacity 64.93 mg/g. After the immobilization of salicylic acid, the basal spacing of Ni-Zn LHSs did not enlarge indicating that the immobilized salicylic acid was on the outer layer without entering the interlayer and this immobilized salicylic acid was stable at medium pH range 3 to 9.

Characterization and Stability Monitoring of Maghemite Nanoparticle Suspensions

2012 ◽  
Vol 576 ◽  
pp. 398-401 ◽  
Author(s):  
Irwan Nurdin ◽  
Idris Yaacob Iskandar ◽  
M. Rafie Johan ◽  
Bee Chin Ang
Keyword(s):  
Zeta Potential ◽  
Magnetic Measurement ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Hydrodynamic Diameter ◽  
Maghemite Nanoparticles ◽  
Nanoparticle Suspensions ◽  
Maghemite Nanoparticle ◽  
The Stability ◽  
Co Precipitation

Maghemite nanoparticle suspensions were synthesized using a co-precipitation method and characterized by a variety of techniques including XRD, TEM, magnetic measurement, DLS, and zeta potential. The stability of the suspension was monitored by measuring the particle size distribution using DLS over a period of two months. The diffraction pattern from XRD measurement confirmed that the particles were maghemite with an average crystallite size of 9.4 nm. TEM observations and analyses showed that the geometry of maghemite nanoparticles were nearly spherical with a mean physical diameter of 9.9 nm. The maghemite nanoparticles showed superparamagnetic behavior with saturation magnetization value of 32.20 emu/g. The mean hydrodynamic diameter of the suspension remained unchanged after two months which indicated no formation of aggregation. The hydrodynamic diameters recorded were 45.1 nm and 48.4 nm, respectively. Additionally, lack of sedimentation indicated that the suspension was stable. The suspension’s zeta potential values were 41.5 mV and 40.4 mV for as synthesized and after two month of storage respectively.

scholarly journals Effect of Indium Incorporation on the Physical Behavior of ZnS Nanoparticles

2020 ◽  
Vol 9 (3) ◽  
pp. 903-907
Keyword(s):  
Ammonium Hydroxide ◽  
Indium Content ◽  
Precipitation Method ◽  
Homogeneous Distribution ◽  
Complexing Agent ◽  
Zns Nanoparticles ◽  
Ft Ir ◽  
Co Precipitation ◽  
Average Size ◽  
Composition Properties

In–doped ZnS nanoparticles are synthesized via chemical co-precipitation method using different precursor solutions of zinc acetate (source of Zn2+ ions), sodium sulphide (source of S2- ions), indium sulphate (source of dopant In3+ ions), ammonium hydroxide (works as a complexing agent) and EDTA (as a capping agent). The effect of different concentrations of Indium (0%, 1%, 3%, and 5%) on the structure, morphology, and elemental composition properties of nanoparticles have been studied using different characterization techniques. XRD study shows the formation of cubic structure in the synthesized nanoparticles. The average size of nanoparticles calculated using Debye - Scherrer’s equation is in the range of 5.7–2.4 nm. It has been observed that the size of ZnS nanoparticles decrease with an increase in Indium concentration. SEM micrographs have explored the surface feature of the nanoparticles. It clearly shown that the morphology of spherical nanoparticles is changing with In concentration. The elemental identification and mapping has indicated the homogeneous distribution of Zinc, Sulfur and Indium content in synthesized nanoparticles. FT–IR spectra have recognized the existance of characteristics absorption peaks for In-doped ZnS

scholarly journals Zinc and cobalt nano ferrites and their potential applications in environmental sustainability

2020 ◽  
Author(s):  
Leena V. Hublikar ◽  
Sharanabasava V Ganachari ◽  
Jayachandra S. Yaradoddi ◽  
Aasim U. Mokashi
Keyword(s):  
Transition Metals ◽  
Environmental Sustainability ◽  
Combustion Method ◽  
Structure Type ◽  
Precipitation Method ◽  
Magnetic Oxide ◽  
Potential Applications ◽  
Fundamental Research ◽  
Co Precipitation ◽  
Average Size

Abstract Fundamental research and industrially applied research, currently depend on magnetic oxide nanoparticles and ferromagnetic oxides due to their extensive applications for electronic, magnetic, optical sensor and absorptive activities. ferromagnetic substances mainly contain different type of Ferrite. Ferrite material constitutes, Iron oxide (Fe2O3) and divalent metal oxides of Transition metals like cobalt, nickel etc. The key objective of this paper is to study the impending applications of nano - ferrites doped with bivalent transition metals with their properties. Low-Temperature Self-Propagating combustion method was used to synthesize the particles. Synthesized Zinc and Cobalt Nano ferrites from the chemical co-precipitation method were found to be of 20 to 90 nm in average size, and comparative study of their properties using the results of Fourier-transform spectroscopy (FTIR) and X-ray powder diffraction (XRD). The Field Emission Scanning Electron Microscope (FESEM) confirms the conception of ferrite nanoparticles with a structure type cubic spinel. Further comparative Sensing studies showed that the sample displays variation in resistance when gases are passed over the surface, and the change in resistance is observed.

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