Nanoclay-Supported Zero-Valent Iron as an Efficient Adsorbent Material for Arsenic

2013 ◽  
Vol 686 ◽  
pp. 296-304 ◽  
Author(s):  
Michael Leo Dela Cruz ◽  
Khryslyn Araño ◽  
Eden May Dela Pena ◽  
Leslie Joy L. Diaz
Keyword(s):  
Inductively Coupled Plasma ◽  
Order Rate Constant ◽  
Interplanar Distance ◽  
Second Order ◽  
Zero Valent Iron ◽  
Particle Model ◽  
Aqueous Environment ◽  
Arsenic Adsorption ◽  
Elovich Equation ◽  
Pseudo Second Order

The release of arsenic to aqueous environment imposes threats to human health. Montmorillonite supported zero-valent iron (ZVI-MMT) is a material with capability of immobilizing arsenic from aqueous environment. The arsenic adsorption efficiency of ZVI-MMT was obtained. In addition, adsorption kinetics of arsenic contaminated water on the material was determined. Arsenic and iron content was quantified by an inductively coupled plasma mass spectrometer (ICP-MS), interplanar distance of the adsorbent was measured by x-ray diffractometer (XRD), and the morphology of the adsorbent was obtained from a transmission electron microscope (TEM). Isotherm data were analyzed using the Langmuir and Freundlich isotherms. The data fitted well to Langmuir isotherm with derived adsorption capacity of 20.1 mg/g. Kinetics data were analyzed using intra-particle model, Elovich equation, pseudo first-, and pseudo second-order models. Elovich equation and pseudo second-order equation fitted the experimental data with pseudo second-order rate constant of 61.2 x 10-4 g/mg-min.

scholarly journals Guidelines for general adsorption kinetics modeling

2020 ◽  
Vol 74 (1) ◽  
pp. 65-70
Author(s):  
Bojana Obradovic
Keyword(s):  
Adsorption Kinetics ◽  
Scale Up ◽  
Second Order ◽  
Particle Diffusion ◽  
Analysis And Evaluation ◽  
Inappropriate Use ◽  
Adsorption Processes ◽  
Intra Particle Diffusion ◽  
Elovich Equation ◽  
Pseudo Second Order

Adsorption processes are widely used in different technological areas and industry sectors, thus continuously attracting attention in the scientific research and publications. Design and scale-up of these processes are essentially based on the knowledge and understanding of the adsorption kinetics and mechanism. Adsorption kinetics is usually modeled by using several well-known models including the pseudo-first and pseudo-second order models, the Elovich equation, and the intra-particle diffusion based models. However, in the scientific literature there are a significant number of cases with the inappropriate use of these models, utilization of erroneous expressions, and incorrect interpretation of the obtained results. This paper is especially focused on applications of the pseudo-second order, intra-particle diffusion and the Weber-Morris models, which are illustrated with typical examples. Finally, general recommendations for selection of the appropriate kinetic model and model assumptions, data regression analysis, and evaluation and presentation of the obtained results are outlined.

scholarly journals Kinetics of scandium recovery by TVEX-TBP from the solution formed after the salt chlorinator cake leaching

2020 ◽  
Vol 168 ◽  
pp. 00050
Author(s):  
Vadym Korovin ◽  
Yurii Pohorielov ◽  
Yurii Shestak ◽  
Oleksandr Valiaiev ◽  
Jose Luis Cortina
Keyword(s):  
Chemical Interaction ◽  
Extraction Process ◽  
Second Order ◽  
Order Kinetic ◽  
Order Model ◽  
Elovich Equation ◽  
Diffusion Phase ◽  
Leaching Solution ◽  
Pseudo Second Order ◽  
Kinetics Of

Kinetics of scandium recovery by TVEX containing tributyl phosphate was studied from the clarified leaching solution of salt chlorinator cake. To assess the contribution of each diffusion phase, experimental data were analyzed using a graphic method. To define the contribution of chemical interaction into the scandium extraction process, recovery kinetics was quantitatively described using pseudo-first order, pseudo-second order kinetic models and Elovich equation in linearized form. It was established that recovery kinetics was most accurately described with the pseudo-second-order model.

Removal of caffeine from aqueous solution by green approach using Ficus Benjamina zero-valent iron/copper nanoparticles

2020 ◽  
Vol 38 (9-10) ◽  
pp. 325-343 ◽  
Author(s):  
Hossam Mohammed Abdel-Aziz ◽  
Rabie Saad Farag ◽  
Soha Ali Abdel-Gawad
Keyword(s):  
Copper Nanoparticles ◽  
Linear Models ◽  
Linear Regression Analysis ◽  
Second Order ◽  
Zero Valent Iron ◽  
Green Approach ◽  
Iron Copper ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Synthesis Approach

Green synthesis approach was successful used extract was successful in preparing bimetallic zero-valent Iron/Copper nanoparticles [FB-nZVFe/Cu]. Scanning Electron Microscope [SEM], Fourier Transform Infrared Spectroscopy [FTIR], and Dispersive X-ray Spectroscopy [EDX] showing the synthesizing of FB-nZVFe/Cu. The removal efficiency of Caffeine [5 mg L−1] reached 86% under the conditions [0.2 g L−1, 45 min, and pH 5]. The adsorption data are more appropriate by the Langmuir model [R2 = 0.9987] with qmax = 34.34 mg g −1. Kinetic results showed that Caffeine uptake is following pseudo-second-order. Langmuir and pseudo-second-order are more appropriate in linear and non-linear models. Overall, FB-Fe/Cu is a committed green substance for removal Caffeine from aqueous solutions. Functional parameters affect investigated using the Linear regression analysis, we found them to account for over 98% of the variables affecting the removal procedure.

Improved properties of thermally modified wood (TMW) by combined treatment with disodium octoborate tetrahydrate (DOT) and wax emulsion (WE)

Holzforschung ◽  
2018 ◽  
Vol 72 (3) ◽  
pp. 243-250 ◽  
Author(s):  
Wang Wang ◽  
Cong Chen ◽  
Jinzhen Cao ◽  
Yuan Zhu
Keyword(s):  
Inductively Coupled Plasma ◽  
Bending Strength ◽  
Combined Treatment ◽  
Biological Properties ◽  
Second Order ◽  
Differential Model ◽  
Termite Resistance ◽  
Pseudo Second Order ◽  
Thermally Modified Wood ◽  
Modified Wood

AbstractThe aim of this study was to investigate the effect of preimpregnation of thermally modified wood (TMW) with paraffin wax emulsion (WE), which was loaded with disodium octoborate tetrahydrate (DOT). The improvements of physical, mechanical, and biological properties of WEDOT-TMW was in focus. The thermal modification (TM) was conducted at 220°C for 4 h. The equilibrium moisture content (EMC), water absorption, volumetric swelling, bending strength, mold and termite resistance of WEDOT-TMW were determined. The boron leaching data were also determined, while the borate was analyzed by Inductively coupled plasma atomic emission spectroscopy (ICP-AES), followed by the model fitting according to a pseudo-second order differential model. The results indicate that WEDOTimproved water repellency, dimensional stability, bending strength as well as the mold and termite resistance of WEDOT-TMW. The boron leaching of WEDOT-TMW was reduced compared with DOT-TMW due to the hydrophobic effect of WE. The pseudo-second order differential model describes accurately the boron leaching process from WEDOT-TMW.

scholarly journals Effect of structural differences of pumice on synthesis of pumice-supported nFe0: removal of Cr (VI) from water

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Bilsen Tural ◽  
Erdal Ertaş ◽  
Mehmet Güzel ◽  
Servet Tural
Keyword(s):  
Iron Content ◽  
Second Order ◽  
Zero Valent Iron ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Support Material ◽  
Solution Ph ◽  
Nanoscale Zero Valent Iron ◽  
Pseudo Second Order

AbstractIn this study, pumice from different regions of Turkey (Diyarbakir, Southeast Turkey and Bitlis, East Turkey) has been supplied and used as supporting material for nanoscale zero-valent iron (nFe0). Native Bitlis pumice (NBP)-supported nanoscale zero-valent iron (BP-nFe0) and native Diyarbakir pumice (NDP)-supported nanoscale zero-value iron (DP-nFe0) were synthesized under the same conditions. Native pumice (NDP, NBP) and pumice-supported nFe0 (DP-nFe0 and BP-nFe0) adsorbents were morphologically and structurally characterized by SEM, EDX, XRF and BET. When using NBP as support material, the iron content of the BP-nFe0 increased 1.9-fold from 1.99 to 3.83%. However, iron content of NDP (2.08%) increased approximately 29 times after it is used as a support material in synthesis of DP-nFe0 (60%). The removal potential of native pumice (NBP and NDP) and iron-modified pumice (BP-nFe0 and DP-nFe0) samples was investigated to remove Cr(VI) ions. The parameters of solution pH, initial metal concentration, contact time and the amount of adsorbent in the removal of chromium (VI) ions were investigated. Langmuir, Freundlich, Temkin, Dubinin–Radushkevich and Jovanovic isotherm models were used to evaluate the adsorption equilibrium data. The equilibrium adsorption was found so as to be well described by the Langmuir isotherm model for all the adsorbents studied. The maximum adsorption capacity of Cr(VI) ions for NDP, NBP, DP-nFe0 and BP-nFe0 was 10.82, 14.30, 161.29 and 17.39 mg/g, respectively. The rate of Cr(VI) removal was subjected to kinetic analysis using pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elovich models. Kinetic studies suggest that adsorption of NDP, NBP, DP-nFe0 and BP-nFe0 described more favorably by the pseudo-second-order kinetic model. The results showed that NDP is a much better support material for nFe0 when compared to NBP.

scholarly journals Kinetic Modeling and Effect of Process Parameters on Selenium Removal Using Strong Acid Resin

2016 ◽  
Vol 6 (4) ◽  
pp. 1045-1049
Author(s):  
N. Rajamohan ◽  
R. Rajesh Kannan ◽  
M. Rajasimman
Keyword(s):  
Ion Exchange ◽  
Removal Efficiency ◽  
Exchange Process ◽  
Selenium Concentration ◽  
Strong Acid ◽  
Order Rate Constant ◽  
Second Order ◽  
Order Model ◽  
Selenium Removal ◽  
Pseudo Second Order

Heavy metal pollution due to the contamination of Selenium above the tolerable limit in the natural environment is a challenging issue that environmental scientists face. This study is aimed at identifying ion exchange technology as a feasible solution to remove selenium ions using 001x7 resin. Parametric experiments were conducted to identify the optimal pH, sorbent dose and speed of agitation. Selenium removal efficiency of 85% was attained at pH 5.0 with 100 mg/L selenium concentration. The increase in resin dose was found to increase removal efficiency. However, metal uptake decreased. The experiments on the effect of concentration proved the negative effect of higher concentrations of selenium on removal efficiency. The ion exchange process was proved to be optimal at an agitation speed of 200 rpm and a temperature of 35 °C. Pseudo second order model was found to fit the kinetic data very well compared to the pseudo-first order model and the pseudo second order rate constant was estimated as 8.725x10-5 g mg-1 min-1 with a solution containing 100 mg/L selenium.

scholarly journals Kinetika Adsorpsi Gas Benzena Pada Karbon Aktif Tempurung Kelapa

Jurnal MIPA ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 100
Author(s):  
Rizky B. Holle ◽  
Audy D. Wuntu ◽  
Meiske S. Sangi
Keyword(s):  
Activated Carbon ◽  
Rate Equation ◽  
Order Rate Constant ◽  
Second Order ◽  
Coconut Shell ◽  
Benzene Adsorption ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Order Rate Equation ◽  
Gaseous Benzene

Telah diteliti kinetika adsorpsi gas benzena pada karbon aktif tempurung kelapa yang diaktivasi dengan NaCl dengan tujuan menentukan model kinetika yang dapat diaplikasikan untuk adsorpsi gas benzena pada karbon aktif tempurung kelapa. Data adsorpsi dianalisis dengan menggunakan empat model persamaan laju adsorpsi yaitu (1) persamaan laju order pertama pseudo Lagergren, (2) persamaan laju order kedua pseudo Ho, (3) persamaan Elovich, dan (4) persamaan Ritchie. Hasil kajian menunjukkan bahwa model kinetika dengan persamaan laju order ke-2 pseudo Ho adalah yang paling sesuai diaplikasikan untuk adsorpsi gas benzena pada karbon aktif tempurung kelapa. Dari model kinetika order ke-2 pseudo Ho diperoleh konstanta adsorpsi benzena sebesar 1,63x10-4 g mg-1 min-1. Nilai energi adsorpsi menunjukkan bahwa benzena teradsorpsi secara fisik pada adsorben.Kinetics of gaseous benzene adsorption on coconut shell NaCl-activated carbon had been studied. The research was aimed to determine the appropriate kinetic model applied to gaseous benzene adsorption on the adsorbent. Adsorption data was analyzed using four kinetic models of adsorption rate equation, which were (1) Lagergren’s pseudo first order rate equation, (2) Ho’s pseudo second order rate equation, (3) Elovich‘s equation, and (4) Ritchie’s equation. The results showed that the Ho’s pseudo second order rate equation was best applied to gaseous benzene adsorption on coconut shell activated carbon. The second order rate constant for benzene adsorption was 1.63x10-4 g mg-1 min-1. The value of adsorption energy showed that benzene was physically adsorbed on the adsorbent.

scholarly journals KINETICS OF SCANDIUM SORPTION BY IMPREGNATE CONTAINING PHOSPHINOXIDE

2017 ◽  
Vol 60 (8) ◽  
pp. 28 ◽  
Author(s):  
Pyae Phyo Aung ◽  
Olga A. Veselova ◽  
Irina D. Troshkina
Keyword(s):  
Phosphine Oxide ◽  
Arrhenius Equation ◽  
Correlation Coefficients ◽  
Second Order ◽  
Hypercrosslinked Polystyrene ◽  
Order Model ◽  
Elovich Equation ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Solution Volume

The kinetics of scandium sorption with impregnate-containing extractant – phosphine oxide based on hypercrosslinked polystyrene from nitric acid solutions was studied using a method of limited solution volume. A sample of sorbent obtained by impregnation contained 0.233 g extractant/g impregnate. Under batch conditions, the influence of temperature in the range 293-313 K on the kinetics of scandium sorption by impregnate was studied. It was revealed that the saturation of impregnate by scandium is established in 20-30 min. For the processing of integral kinetic scandium sorption curves, the pseudo-first and pseudo-second-order models, as well as the Elovich equation, were used. The values of the rate constants calculated from the pseudo-second-order model, describing the kinetic data with the best correlation coefficients (R2 0.931-0.995), reach (9.51-10.4) g∙(mmol∙min)-1. The activation energy of scandium sorption, calculated by an equation similar to the Arrhenius equation, is (2.8±0.2) kJ / mol. Due to the improved kinetic characteristics compared with traditional sorbents, hypercrosslinked polystyrene impregnates containing phosphine oxide can be used to extract of scandium from solutions formed during the processing of scandium-containing raw materials.Forcitation:Pyae Phyo Aung, Veselova O.A., Troshkina I.D. Kinetics of scandium sorption by impregnate containing phosphinoxide. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 8. P. 28-30.

scholarly journals Kinetic and Thermodynamics of Methylene Blue Adsorption onto Zero Valent Iron Supported on Mesoporous Silica

2016 ◽  
Vol 11 (2) ◽  
pp. 250 ◽  
Author(s):  
Atyaf Khalid Hameed ◽  
Nugroho Dewayanto ◽  
Du Dongyun ◽  
Mohd Ridzuan Nordin ◽  
Mohd Hasbi Ab Rahim
Keyword(s):  
Methylene Blue ◽  
Mesoporous Silica ◽  
Adsorption Process ◽  
Mesoporous Silica Nanoparticles ◽  
Kinetic Studies ◽  
Second Order ◽  
Zero Valent Iron ◽  
Order Kinetic ◽  
Methylene Blue Adsorption ◽  
Pseudo Second Order

<p>Zero valent iron supported on mesoporous silicanano particles (NZVI/MSNs) was prepared by the aqueous phase borohydride reduction methods. Prior to the reduction, mesoporous silica nanoparticles (MSNs) were prepared through the activation of fumed silica with concentrated HCl by refluxing at 90 °C. FTIR, XRD, FESEM, EDX and BET were used to characterize theadsorbents prepared. BET surface areas of MSNs, NZVI, and NZVI/MSNs were 126, 41, and 72 m<sup>2</sup>/g for, respectively. The performance of NZVI/MSNs as adsorbent was examined by adsorption of methylene blue (MB), performed in series of batch experiments. In the kinetic studies, pseudo first order and pseudo second order kinetic models were examined. The pseudo second order equation provided the best fit with the experimental data. Thermodynamic studies indicated that the adsorption process is endothermic with ΔH° was 90.53 kJ/mol. Positive ΔS° (300 J/mol) and negative ΔG° (-6.42 kJ/mol) was recorded, indicating the spontaneous of the adsorption process and naturally favorable. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 5<sup>th</sup> March 2016; Revised: 18<sup>th</sup> March 2016; Accepted: 18<sup>th</sup> March 2016</em></p><p><strong>How to Cite:</strong> Hameed, A.K., Dewayanto, N., Dongyun, D., Nordin, M.R., Mohd Hasbi Ab. Rahim, M.H.A. (2016). Kinetic and Thermodynamics of Methylene Blue Adsorption onto Zero Valent Iron Supported on Mesoporous Silica.<em> Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (2): 250-261 (doi:10.9767/bcrec.11.2.443.250-261)</p><p><strong>Permalink/DOI:</strong> http://dx.doi.org/10.9767/bcrec.11.2.443.250-261</p>

Improvement of As(III) removal with diatomite overlay nanoscale zero-valent iron (nZVI-D): adsorption isotherm and adsorption kinetic studies

2016 ◽  
Vol 17 (1) ◽  
pp. 212-220 ◽  
Author(s):  
Nusavadee Pojananukij ◽  
Kitirote Wantala ◽  
Sutasinee Neramittagapong ◽  
Chitsan Lin ◽  
Duangkanok Tanangteerpong ◽  
...  
Keyword(s):  
Adsorption Isotherm ◽  
Kinetic Studies ◽  
Second Order ◽  
Zero Valent Iron ◽  
Order Kinetic ◽  
Kinetic Adsorption ◽  
Nanoscale Zero Valent Iron ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Nanoscale zero-valent iron coated on diatomite (nZVI-D) was successfully synthesized as a composite material. It is the combination of nZVI and diatomite which has been proved to be a promising material in arsenite or As(III) removal. The result showed that 25.5% of As(III) was removed using diatomite only but more than 95% of As(III) was removed using nZVI-D, at the same contact time of 60 min and pH 6. The experimental isotherm data for As(III) adsorption at different initial concentrations were analyzed using the Langmuir, Freundlich, and Dubinin–Radushkevich equations. Among these three, the equilibrium data fitted well with the Langmuir isotherm. The kinetic adsorption was also studied using the pseudo-first, second-order, and intraparticle diffusion equations. The data were well explained by the pseudo-second-order kinetic model. From the results of kinetic adsorption and the adsorption isotherm, it can be concluded that arsenite adsorption was controlled by the mass transfer and adsorption process.

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