scholarly journals Sol-Gel Synthesis of NiO Nanoparticles and Investigation on Adsorption Capacity in the Removal of Cr(VI) from Aqueous Solution

2016 ◽  
Vol 32 (1) ◽  
pp. 749-758 ◽  
Author(s):  
Saber Ashan ◽  
Nasim Ziaeifara ◽  
Morteza Khosravi
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Sol Gel ◽  
Nio Nanoparticles ◽  
Sol Gel Synthesis

Sol–gel synthesis of NASICON discs from aqueous solution

1997 ◽  
Vol 7 (8) ◽  
pp. 1457-1460 ◽  
Author(s):  
Youichi Shimizu ◽  
Yasunori Azuma ◽  
Satoko Michishita
Keyword(s):  
Aqueous Solution ◽  
Sol Gel ◽  
Sol Gel Synthesis

scholarly journals Sol-gel synthesis of magnetic sorbents based on porous iron oxides for the removal of U(VI) from aqueous solution

2017 ◽  
Author(s):  
E. K. Papynov ◽  
A. S. Portnyagin ◽  
A. I. Cherednichenko ◽  
I. A. Tkachenko ◽  
E. B. Modin ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Iron Oxides ◽  
Sol Gel ◽  
Porous Iron ◽  
Magnetic Sorbents ◽  
Sol Gel Synthesis

Synthesis of a Fe/Ca-based phosphate material and its application for adsorption of uranium ions from aqueous solution

2021 ◽  
pp. geochem2021-052
Author(s):  
Haiyan Liu ◽  
Weimin Zhang ◽  
Jingyi Mo ◽  
Zhen Wang ◽  
Jiahong Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Sol Gel ◽  
Steel Slag ◽  
Single Layer ◽  
Zero Valent Iron ◽  
Separation Coefficient ◽  
Ion Adsorption ◽  
Ion Removal ◽  
Nano Zero Valent Iron

Uranium (U) ion contamination in aquatic systems has received considerable attention worldwide. In this paper, an adsorption material was synthesized with Fe/Ca-based phosphate (CFB-PM) by a sol-gel method. The effect of pH, reaction time and initial concentration of U ions on its capacity of removing U ions from aqueous solution was investigated by static batch experiments. Comparative studies of U ion removal by CFB-PM with four sorbents, namely: nano zero-valent iron (nZVI), hydroxyapatite (HAP), hydroxyapatite-loaded nano zero-valent iron (HAP@nZVI) and high basicity steel slag loaded hydroxyapatite (HBSS@HAP), were performed. Results showed that U ion adsorption capacity of CFB-PM was better than that of nZVI, HAP, HAP@nZVI and HBSS@HAP. The adsorption capacity showed a decreasing order as: CFB-PM (643.34 mg/g) > HAP (549.86 mg/g) > HBSS@HAP (321.82 mg/g) > HAP@nZVI (153.62 mg/g) > nZVI (102.65 mg/g). SEM-EDS examination suggested that the adsorbed U ions were mainly in the form of spheres, sheets or petals on the surfaces of CFB-PM. XRD detection revealed several U-bearing mineral phases (i.e. Ca(UO2)2(PO4)2·3H2O, HPUO6·4H2O and (UO2)3PO4·4H2O). The U ion adsorption behaviors were further explored by FTIR spectroscopy. The uranium ion adsorption process of CFB-PM could be well described by quasi-second-order adsorption kinetics model and the Langmuir adsorption isotherm model. The separation coefficient (RL) was close to zero, indicating that U ion adsorption was dominated by single-layer chemisorption. The findings reported in this study have implications for applying the synthesized material for remediation of U ion-contaminated groundwater.

Effect of Initial Concentration of Cu2+ on the Adsorption Performance of Hydroxyapatite

2014 ◽  
Vol 989-994 ◽  
pp. 312-315
Author(s):  
Yu Tong Guan ◽  
Shao Hong Wang ◽  
Mei Han Wang ◽  
Zhao Xia Hou ◽  
Xiao Dan Hu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Sol Gel ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Eds Analysis

Hydroxyapatite (HAP) is an effective adsorbent for removing heavy metal ions. In this study, HAP was prepared by sol-gel method and used for removing Cu2+ from aqueous solution. Initial concentration of Cu2+ in the aqueous solution was evaluated as an important parameter determining uptake. The removal efficiency and the adsorption capacity of HAP for Cu2+ were investigated. EDS analysis indicated the presence of Cu2+ on the HAP surface.

Synthesis of Nanostructured Hydroxyapatite: A Comparative Study between Sol-Gel and Aqueous Solution Precipitation

2008 ◽  
Vol 396-398 ◽  
pp. 623-626 ◽  
Author(s):  
L.R. Rodrigues ◽  
M. Motisuke ◽  
Cecília A.C. Zavaglia
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Calcium Phosphate ◽  
Comparative Study ◽  
Sol Gel ◽  
Mechanical Resistance ◽  
Commercial Sample ◽  
Phase Purity ◽  
Characterization Study ◽  
Sol Gel Synthesis

Particle size is one of the most important factors to the successful application of calcium phosphate bioceramics as it may have an important role on its final properties such as mechanical resistance and reactivity. Thus, a process which results on very small and homogeneous particles is required, since it avoids further contamination derived from long milling times. On this context, a process such as sol-gel synthesis may be feasible, due to its simplicity on handling and its well known characteristic of producing homogeneous nanoparticles. Moreover, precipitated HA also may lead to satisfactory results regarding particle size and phase purity. The aim of this article was to demonstrate a preliminary characterization study of powders obtained by both methods and to compare them to a commercial sample available in Brazil. Characterization was made by XRD, Scherrer’s equation, XRF, SEM-LV, SEM-FEG and SEM-EDS. It has been found out that all samples consist of pure nanostructured hydroxyapatite with crystallite size between 37nm and 62nm.

Inorganic-organic Hybrid Materials for Real 3-D Sub-νm Lithography

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Houbertz ◽  
J. Schulz ◽  
L. Fröhlich ◽  
G. Domann ◽  
M. Popall ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Sol Gel ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Hybrid Polymer ◽  
Organic Hybrid ◽  
Two Photon ◽  
Applied Technology ◽  
Scale Structures ◽  
Sol Gel Synthesis

AbstractReal 3-D sub-νm lithography was performed with two-photon polymerization (2PP) using inorganic-organic hybrid polymer (ORMOCER®) resins. The hybrid polymers were synthesized by hydrolysis/polycondensation reactions (modified sol-gel synthesis) which allows one to tailor their material properties towards the respective applications, i.e., dielectrics, optics or passivation. Due to their photosensitive organic functionalities, ORMOCER®s can be patterned by conventional photo-lithography as well as by femtosecond laser pulses at 780 nm. This results in polymerized (solid) structures where the non-polymerized parts can be removed by conventional developers.ORMOCER® structures as small as 200 nm or even below were generated by 2PP of the resins using femtosecond laser pulses. It is demonstrated that ORMOCER®s have the potential to be used in components or devices built up by nm-scale structures such as, e.g., photonic crystals. Aspects of the materials in conjunction to the applied technology are discussed.

Exploring the characteristics of the nickel oxide nanoparticles via Sol - gel method

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Jothi M ◽  
Sowmiya K
Keyword(s):  
Nickel Oxide ◽  
Ph Value ◽  
Lattice Structure ◽  
Sol Gel ◽  
Systematic Change ◽  
Average Crystalline Size ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy

Nickel Oxide (NiO) is an important transition metal oxide with cubic lattice structure. NiO is thermally stable that is suitable for tremendous applications in the field of optic, ceramic,glass, electro-chromic coatings, plastics, textiles, nanowires, nanofibers, electronics,energy technology, bio-medicine, magnetism and so on. In this present study, NiO nanoparticles were successfully synthesized by sol-gel technique. Nano-sols were prepared by dissolving Nickel-Chloride [NiCl2.6H2O] in NaOH solvent and were converted into nano structured gel on precipitation. A systematic change in preparation parameters like calcination temperature, time, pH value has been noticed in order to predict the influence on crystallite size. Then the prepared samples were characterized by the X-ray Diffraction Spectroscopic (XRD), UV-VIS Spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). From XRD, the average crystalline-size has been calculated by Debye-Scherrer Equation and it was found to be 12.17 nm and the band gap energy of Nickel oxide (NiO) from UV studies reveals around 3.85 eV. Further, EDX and FTIR studies, confirm the presences of NiO nanoparticles. The SEM study exhibits the spherical like morphology of Nickel oxide (NiO). Further from PSA, the mean value of NiO nanoparticles has been determined.

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