Adsorptive removal of V(V) ions using clinoptilolite modified with polypyrrole and iron oxide nanoparticles in column studies

MRS Advances ◽  
2018 ◽  
Vol 3 (36) ◽  
pp. 2119-2127 ◽  
Author(s):  
NOMCEBO H. MTHOMBENI ◽  
SANDRINE MBAKOP ◽  
AOYI OCHIENG ◽  
MAURICE S. ONYANGO
Keyword(s):  
Electron Microscope ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Oxide Nanoparticles ◽  
Column Studies ◽  
The Fourier Transform

AbstractClinoptilolite modified with polypyrrole and iron oxide nanoparticles (Cln-PPy-Fe3O4) nanocomposite as a potential adsorbent for V (V) ions was prepared via polymerization of pyrrole monomer using FeCl3 oxidant in aqueous medium in which clinoptilolite-Fe3O4 nanoparticles were suspended. The structure and morphology of the prepared adsorbent was analysed with the Fourier transform infrared (FTIR) spectrometer, field-emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and high-resolution transmission electron microscope (HR-TEM). Column fixed bed studies were performed to test the ability of the adsorbent to remove V (V) ions from aqueous solution. Low values of adsorbent exhaustion rate (AER) and large bed volumes were observed at lower metal ion concentration, higher bed mass and lower flow rate for V(V) removal indicating good performance. The volume of treated water processed at breakthrough point were found to be 0.09; 0.63 and 1.26 L for bed mass of 1, 2.5; and 5 g, respectively. The Yoon–Nelson and Thomas models appropriately described the breakthrough curves.

Continuous biosorption of nickel from aqueous solution using Chrysanthemum indicum derived biochar in a fixed-bed column

2017 ◽  
Vol 76 (7) ◽  
pp. 1895-1906 ◽  
Author(s):  
Sowmya Vilvanathan ◽  
S. Shanthakumar
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Column Studies ◽  
Nickel Ion ◽  
Fixed Bed Column ◽  
Nickel Ions ◽  
Chrysanthemum Indicum

The biosorption capability of Chrysanthemum indicum to remove nickel ions from aqueous solution in a fixed-bed column was examined in this study. Native C. indicum flower waste was improved for its biosorptive potential by pyrolysis to obtain its biochar form and, thereby, both raw (CIF-R) and biochar (CIF-BC) forms of the flower were used for Ni(II) removal. Fixed bed column studies were conducted to examine the influence of bed height (1.0–3.0 cm), flow rate (1.0–5.0 mL min−1) and initial metal ion concentration (25–75 mg L−1). The breakthrough curves (Cout/Cin vs time) were modelled using different dynamic adsorption models, viz. Adams-Bohart, Thomas and Yoon-Nelson model. Interpretation of the data revealed a favorable correlation with the Thomas model with higher R2 values and closer model-predicted and experimental biosorption capacity values. The equilibrium uptake capacity of CIF-R and CIF-BC for Ni(II) were found to be 14.02 and 29.44 mg g−1, respectively. Further, the column was regenerated using HCl as eluent, to desorb the adsorbed Ni(II) ions. The experimental results implied and affirmed the suitability of the biosorbents for nickel ion biosorption with its nature being favorable, efficient, and environmentally friendly.

scholarly journals Chelate-free metal ion binding and heat-induced radiolabeling of iron oxide nanoparticles

2015 ◽  
Vol 6 (1) ◽  
pp. 225-236 ◽  
Author(s):  
Eszter Boros ◽  
Alice M. Bowen ◽  
Lee Josephson ◽  
Neil Vasdev ◽  
Jason P. Holland
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Oxide Nanoparticles ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Free Metal ◽  
Free Metal Ion

Holland and co-workers report details of a novel chelate-free reaction for radiolabeling of pre-fabricated nanoparticles using different radionuclides.

Mercury Sorption on Chitosan

2007 ◽  
Vol 20-21 ◽  
pp. 635-638 ◽  
Author(s):  
Karol Campos ◽  
Eric Guibal ◽  
Francisco Peirano ◽  
M. Ly ◽  
Holger Maldonado
Keyword(s):  
Particle Size ◽  
Metal Ion ◽  
Fixed Bed ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Fixed Bed Reactor ◽  
Continuous Systems ◽  
Maximum Sorption

Mercury sorption on chitosan was investigated in batch and continuous systems. Chitosan sorption properties were determined through sorption isotherms. Langmuir and Freundlich equations were used for the modeling of isotherms at pH 5. In batch systems, maximum sorption capacities reached 550 mg Hg/g. Sorption kinetics have been studied as a function of sorbent particle size and stirring rate. Dynamic removal of mercury was tested in a fixed bed reactor investigating the following parameters: particle size, column size, flow velocity and metal ion concentration. Clark and Adams-Bohart models were evaluated for the simulation of breakthrough curves. This study shows that chitosan is an effective sorbent for the treatment and recovery of mercury from dilute effluents at near neutral pH.

scholarly journals Signature of antiphase boundaries in iron oxide nanoparticles

2021 ◽  
Vol 54 (6) ◽  
Author(s):  
Tobias Köhler ◽  
Artem Feoktystov ◽  
Oleg Petracic ◽  
Nileena Nandakumaran ◽  
Antonio Cervellino ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Powder Diffraction ◽  
Magnetic Moments ◽  
Reference Value ◽  
Oxide Nanoparticles ◽  
Planar Lattice ◽  
Antiphase Boundaries ◽  
Diffraction Patterns ◽  
The Fourier Transform

Iron oxide nanoparticles find a wide variety of applications, including targeted drug delivery and hyperthermia in advanced cancer treatment methods. An important property of these particles is their maximum net magnetization, which has been repeatedly reported to be drastically lower than the bulk reference value. Previous studies have shown that planar lattice defects known as antiphase boundaries (APBs) have an important influence on the particle magnetization. The influence of APBs on the atomic spin structure of nanoparticles with the γ-Fe2O3 composition is examined via Monte Carlo simulations, explicitly considering dipole–dipole interactions between the magnetic moments that have previously only been approximated. For a single APB passing through the particle centre, a reduction in the magnetization of 3.9% (for 9 nm particles) to 7.9% (for 5 nm particles) is found in saturation fields of 1.5 T compared with a particle without this defect. Additionally, on the basis of Debye scattering equation simulations, the influence of APBs on X-ray powder diffraction patterns is shown. The Fourier transform of the APB peak profile is developed to be used in a whole powder pattern modelling approach to determine the presence of APBs and quantify them by fits to powder diffraction patterns. This is demonstrated on experimental data, where it could be shown that the number of APBs is related to the observed reduction in magnetization.

scholarly journals Evaluating the performance of an eggshell-bagasse biosorption system in removing lead and cadmium from aqueous solutions

2021 ◽  
Author(s):  
◽  
Charlene Harripersadth
Keyword(s):  
Metal Ion ◽  
Kinetic Modelling ◽  
Agricultural Waste ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Equilibrium Studies ◽  
Lead And Cadmium ◽  
Biosorption Process ◽  
Oxygen Atoms

In this research investigation, the simultaneous use of 2 biomaterials, sugarcane bagasse and eggshells, were applied as biosorbents in the treatment of metal laden effluent. Under the characterisation measurements investigated, it was found that carbon, calcium and oxygen atoms which constitute carboxylic and carbonate functional groups were prominent in eggshells, whereas for bagasse, it was carbon, hydrogen and oxygen atoms constituting hydroxyl and carbonyl groups. Batch studies were conducted to investigate the effect of fundamental process variables such as particle size (75 – 250 μm), initial metal ion concentration (40 – 240 mg/L), pH (2 – 7) and contact time (0 – 120 min). With respect to the equilibrium studies, the applicability of the Langmuir isotherm implied a monolayer formation of metal ions onto the surface of both biomaterials with the maximum amounts of Pb and Cd adsorbed based on 1 g of biosorbent being 277.8 and 13.62 mg/g for eggshells and 31.45 and 19.49 mg/g for bagasse, respectively. Moreover, kinetic modelling revealed that the process was well described by the pseudo – second order model for both Pb and Cd using eggshells and bagasse. Fixed bed studies were used to assess the dynamic adsorption behaviour of the eggshell – bagasse system using a lab – scale adsorption column of 2.3 cm in diameter and 30 cm in height. The effect of bed depth (4 – 12 cm) on 5 adsorbents (eggshells, bagasse, adsorbent A, adsorbent B and adsorbent C) in the removal of Pb were investigated. Adsorbents A, B and C were a combination of both eggshells and bagasse with adsorbent A constituting 75wt % bagasse and 25wt % eggshells, adsorbent B constituting 50wt % bagasse and 50wt % eggshells and adsorbent C constituting 25wt % bagasse and 75wt % eggshells. The column experiments highlighted an improvement in bed performance with an increase in bed depth resulting in greater mass transfer zones, breakthrough times and larger quantities of effluents treated. Two kinetic models (Thomas and Yoon–Nelson) were used to interpret the breakthrough curves where the data showed good fits to both models used. In determining the efficacy of the eggshell – bagasse biosorption system, adsorbent C was found to be most proficient in the removal of Pb with eggshells, adsorbent B, adsorbent A and bagasse following suit. The results from this investigation strongly suggest the plausible reuse of agricultural waste materials in the treatment of contaminated effluent through the biosorption process.

Enhancing bio-gas production from kitchen waste using BSA-iron oxide nanoparticles in miniature level bio-reactor

2016 ◽  
Vol 78 (2) ◽  
pp. 71-77
Author(s):  
R.S.S. Prabhahar ◽  
N. Vignesh
Keyword(s):  
Iron Oxide ◽  
Iron Oxides ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Biogas Production ◽  
Gas Production ◽  
Oxide Nanoparticles ◽  
Anaerobic Conditions ◽  
The Media ◽  
Fe Ions

Purpose: This study focuses on increasing production of biogas as an alternative energyfrom biodegradable wastes (BWs) using BSA coated iron oxides nanoparticles, in view ofsolving waste management at household level. Many attempts have been performed in orderto increase biogas production, including thermal pre-treatment of organic waste, but all ofthem present limited industrial applications. Iron has been shown to enhance anaerobicdigestion, but there are severe drawbacks for introducing the metal ion in an anaerobicclosed reactor.Design/methodology/approach: Process for the production of biogas from biodegradablematerial which comprises the steps of: (a) adding the biodegradable material to the Bioreactor,(b) inoculating the microorganisms in the digester,(c) synthesis iron oxides and BSApowder coated on the particles (d) adding a colloidal solution of surface-modified BSA-ironoxide nanoparticles to the reactor; (e) providing anaerobic conditions; (f) carrying out theanaerobic digestion; and (g) collecting the biogas, wherein the steps (a), (b) and (c) can becarried out in any order. It also comprises the use of BSA-iron oxide nanoparticles capableof supplying Fe ions to the media for biogas production in anaerobic conditions and in thepresence of Fe ions in the media.

Metal ion-mediated synthesis and shape-dependent magnetic properties of single-crystalline α-Fe2O3 nanoparticles

CrystEngComm ◽  
2014 ◽  
Vol 16 (25) ◽  
pp. 5566-5572 ◽  
Author(s):  
Wei Wu ◽  
Shuanglei Yang ◽  
Jun Pan ◽  
Lingling Sun ◽  
Juan Zhou ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Oxide Nanoparticles ◽  
Fe2o3 Nanoparticles ◽  
Single Crystalline

Some useful insights into the synthesis and shape-dependent magnetic properties of iron oxide nanoparticles with different morphologies are presented.

scholarly journals Fixed-Bed Column Adsorption Studies of Lead (II) From Aqueous Solution Using Chitosan -G-Maleic Anhydride-G-Methacrylic Acidcopolymer

2020 ◽  
pp. 316-334
Keyword(s):  
Aqueous Solution ◽  
Maleic Anhydride ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Column Adsorption ◽  
Dynamics Models

The adsorption of Lead (II) from aqueous solution by chitosan-g-maleic anhydride-g-methacrylic acidcopolymer was investigated in fixed- bed column.The continuous adsorption varying the effect of flow rates, bed height and concentration and breakthrough curves was evaluated and it was also analyzed by dynamics models namely, Boharts and Adam, Thomas and Yoon and Nelson models at different conditions.The breakthrough data fitted well to Thomas and Yoon Nelson models with high correlation coefficient, R 2 is 0.9835. The highest bed capacity of chitosan-g-maleicanhydride-g-methacrylicacid adsorbent was obtained using 1 ml /min flow rate, 100 ppm inlet Pb metal ion concentration, and 3 cm bed height

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