The Experts below are selected from a list of 2973 Experts worldwide ranked by ideXlab platform
K A Matis - One of the best experts on this subject based on the ideXlab platform.
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sorption of cd ions onto akaganeite type nanocrystals
Separation and Purification Technology, 2005Co-Authors: Eleni A Deliyanni, K A MatisAbstract:The aim of this paper is to remove cadmium ions from aqueous solutions by sorption onto synthetic akaganeite-type nanocrystals. This material was shown to be a promising Inorganic Adsorbent due to its favourite characteristics. Synthetic akaganeite was prepared in the laboratory according to a new method. In this paper, the effects of Adsorbent amount, initial cadmium concentration, pH value of solution, concentration of background electrolyte ions and temperature variation on the treatment process of cadmium removal by akaganeite were investigated. Typical adsorption isotherms (Freundlich and Langmuir) were determined for the mechanism of sorption process. X-ray photoelectron spectroscopy (XPS) analysis also revealed useful information.
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sorption of as v ions by akaganeite type nanocrystals
Chemosphere, 2003Co-Authors: Eleni A Deliyanni, D N Bakoyannakis, A I Zouboulis, K A MatisAbstract:Abstract A priority pollution problem, the removal of arsenate oxyanions from dilute aqueous solutions by sorption onto synthetic akaganeite (β-FeO(OH)) was the aim of the present study. This is an innovative Inorganic Adsorbent material prepared in the laboratory, following a new method of preparation. The effect of akaganeite and arsenate concentration, the contact time, temperature, solution pH value, and ionic strength variation on the treatment process was mainly investigated during this study. Typical adsorption isotherms were determined, which were found to fit sufficiently the typical Langmuir equation. The mechanism of sorption was examined by electrokinetic, X-ray diffraction, Fourier transmission infrared and scanning electron microscopy measurements. Promising results were obtained, due to the favourite characteristics of the Adsorbent applied.
Eleni A Deliyanni - One of the best experts on this subject based on the ideXlab platform.
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sorption of cd ions onto akaganeite type nanocrystals
Separation and Purification Technology, 2005Co-Authors: Eleni A Deliyanni, K A MatisAbstract:The aim of this paper is to remove cadmium ions from aqueous solutions by sorption onto synthetic akaganeite-type nanocrystals. This material was shown to be a promising Inorganic Adsorbent due to its favourite characteristics. Synthetic akaganeite was prepared in the laboratory according to a new method. In this paper, the effects of Adsorbent amount, initial cadmium concentration, pH value of solution, concentration of background electrolyte ions and temperature variation on the treatment process of cadmium removal by akaganeite were investigated. Typical adsorption isotherms (Freundlich and Langmuir) were determined for the mechanism of sorption process. X-ray photoelectron spectroscopy (XPS) analysis also revealed useful information.
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sorption of as v ions by akaganeite type nanocrystals
Chemosphere, 2003Co-Authors: Eleni A Deliyanni, D N Bakoyannakis, A I Zouboulis, K A MatisAbstract:Abstract A priority pollution problem, the removal of arsenate oxyanions from dilute aqueous solutions by sorption onto synthetic akaganeite (β-FeO(OH)) was the aim of the present study. This is an innovative Inorganic Adsorbent material prepared in the laboratory, following a new method of preparation. The effect of akaganeite and arsenate concentration, the contact time, temperature, solution pH value, and ionic strength variation on the treatment process was mainly investigated during this study. Typical adsorption isotherms were determined, which were found to fit sufficiently the typical Langmuir equation. The mechanism of sorption was examined by electrokinetic, X-ray diffraction, Fourier transmission infrared and scanning electron microscopy measurements. Promising results were obtained, due to the favourite characteristics of the Adsorbent applied.
H Blunden - One of the best experts on this subject based on the ideXlab platform.
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adsorptive separation of phosphate oxyanion from aqueous solution using an Inorganic Adsorbent
Environmental Geochemistry and Health, 2010Co-Authors: B Saha, L Griffin, H BlundenAbstract:Phosphate removal from aqueous solution was explored using granular ferric hydroxide (GFH) as an Inorganic Adsorbent. Adsorption, desorption and kinetic studies were conducted on laboratory scale to evaluate the performance of GFH as an Adsorbent for low concentrations of phosphate solution. The effect of pH on adsorption was investigated, and phosphate uptake was shown to decrease with an increase in solution pH, with maximum removal seen to occur at pH 3. The experimental data best fit the Temkin isotherm at both pH 3 and 4. Uptake of phosphate by GFH follows second-order kinetics, with the small particle range (76-200 microm) removing phosphate from the solution more rapidly than the larger particle range (710-850 microm). The kinetic results suggest that intra-particle diffusion is an important factor in phosphate adsorption onto GFH. Thermodynamic parameters (DeltaG degrees, DeltaH degrees, DeltaS degrees) were evaluated, and the results indicated that the adsorption process was endothermic and spontaneous. This study demonstrates that GFH has potential to be used as a cost-effective Adsorbent for phosphate removal from aqueous solution.
Sharifah Mohamad - One of the best experts on this subject based on the ideXlab platform.
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new magnetic silica based hybrid organic Inorganic nanocomposite for the removal of lead ii and nickel ii ions from aqueous solutions
Materials Chemistry and Physics, 2019Co-Authors: Naqhiyah Farhan Ahmad, Hassan Sereshti, Milad Mousazadeh, Hamid Rashidi Nodeh, Muhammad Afzal Kamboh, Sharifah MohamadAbstract:Abstract A novel magnetic sol-gel silica-based hybrid organic-Inorganic Adsorbent (MNPs@SiO2-TSD-TEOS) was synthesized by immobilizing silica (SiO2) shell on Fe3O4 magnetic nanoparticles (MNPs) prior to binding with hybrid organic-Inorganic tetraethylorthosilicate (TEOS) and N-[3-(trimethoxysilyl)propyl]ethylenediamine (TSD)). The proposed material was characterized using Fourier transform infrared spectrometer (FTIR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscope (EDS) and X-ray diffraction (XRD). MNPs@SiO2-TSD-TEOS was applied as an Adsorbent for the simultaneous adsorption of Pb(II) and Ni(II) ions from aqueous solutions. The adsorption process, reusability test and field application of MNPs@SiO2-TSD-TEOS were performed using batch adsorption of metal ions at pH 5. The adsorption process was well-matched to type III isotherm model (multilayer sorption) set by IUPAC. The experimental adsorption data were well-fitted to the Freundlich adsorption isotherm since its coefficient of determination (R2 = 0.997) is higher than that of the Langmuir isotherm (R2 = 0.871). The adsorption kinetics were fitted well to pseudo-2nd-order model as compared to pseudo-1st-order. Furthermore, the results showed maximum adsorption capacities of 417 and 357 mg g−1 for Pb(II) and Ni(II), respectively. Isotherm model (type III), Freundlich isotherm and pseudo-2nd-order model confirm a multilayer chemical/physical adsorption process.
Saeid Eslamian - One of the best experts on this subject based on the ideXlab platform.
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adsorption reduction of hg ii and pb ii from aqueous solutions by using bone ash nzvi composite effects of aging time fe loading quantity and co existing ions
Environmental Science and Pollution Research, 2018Co-Authors: Mohammad Javad Amiri, Jahangir Abedikoupai, Saeid EslamianAbstract:In this research, a versatile and highly efficient method for the stabilization of nanoscale zerovalent iron particles (nZVI) on the surface of ostrich bone ash (OBA) was presented as a novel Inorganic Adsorbent (OBA/nZVI) for the removal of Hg(II) and Pb(II) ions from aqueous solutions, even after 1 year of storage under room conditions. The removal behavior of the OBA/nZVI was assessed as a function of the initial pH, contact time, initial pollutants concentration, temperature, amount of Adsorbent, effect of competitive metal ions, and ionic strength. The synthesized Adsorbent was characterized by several techniques including N2 adsorption at - 196 °C, FT-IR spectroscopy, scanning electron microscopy, X-ray diffraction, and zeta potential. The results confirmed that the OBA is a good candidate as support of nZVI. The maxima adsorption capacity for Hg(II) and Pb(II) ions found from experimental results were 170 and 160 mg g-1, when the loading quantities of Fe were 20%. The equilibrium sorption data obeyed a Langmuir-Freundlich isotherm type model. The kinetic data of the adsorption followed the mechanism of the pseudo-second-order model. The thermodynamic experiments indicated that the removal of metal ions were feasible, endothermic, and spontaneous. It can be found that fresh and aged OBA/nZVI maintained its usability even after five cycles in the order: fresh (OBA/nZVI)-Hg(II) > fresh (OBA/nZVI)-Pb(II) > aged (OBA/nZVI)-Hg(II) > aged (OBA/nZVI)-Pb(II), which indicate that OBA/nZVI can be regenerated as Adsorbent. The existence of Fe in the OBA/nZVI was proved by SEM-EDX results and X-ray diffraction analysis also confirmed adsorption/reduction of some of the Hg(II) to Hg0 and Pb(II) to Pb0.