scholarly journals Efficient Removal of Ni(II) from Aqueous Solution by Date Seeds Powder Biosorbent: Adsorption Kinetics, Isotherm and Thermodynamics

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1001
Author(s):  
Abubakr Elkhaleefa ◽  
Ismat H. Ali ◽  
Eid I. Brima ◽  
A. B. Elhag ◽  
Babiker Karama
Keyword(s):  
Physical Adsorption ◽  
Solution Concentration ◽  
Order Kinetic ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Date Seeds Powder ◽  
Experimental Findings

Adsorption investigations in batch approaches were performed to explore the biosorption of Ni(II) ions from aqueous solutions on date seeds powder. The effects of pH, particle size, initial concentration of Ni(II) ions, adsorbent mass, temperature, and contact on the adsorption efficacy were studied. The maximum removal obtained was 90% for an original Ni(II) ion solution concentration of 50 ppm was attained at pH 7 after 30 min and with 0.30 g of an added adsorbent. The four adsorption models, namely Freundlich, Langmuir, Dubinin–Radushkevich (D–R), and Temkin were examined to fit the experimental findings. The adsorption system obeys the Freundlich model. The system was found to follow the pseudo-second order kinetic model. Thermodynamic factors; entropy (ΔS°), enthalpy (ΔH°), and Gibbs free energy (ΔG°) changes were also assessed. Results proved that adsorption of Ni(II) ions is exothermic and spontaneous. Sticking probability value was found to be less than unity, concluding that the process is dominated by physical adsorption.

scholarly journals Removing Pb(II) Ions from Aqueous Solution by a Promising Absorbent of Tannin-Immobilized Cellulose Microspheres

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 548 ◽  
Author(s):  
Ying Pei ◽  
Gaoqiang Xu ◽  
Xiao Wu ◽  
Keyong Tang ◽  
Guozhen Wang
Keyword(s):  
Aqueous Solution ◽  
Physical Adsorption ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Behaviors ◽  
Initial Ph ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Tannin/cellulose microspheres (T/C) were successfully prepared via a facile homogeneous reaction in a water/oil (W/O) emulsion for removing Pb(II) ions from aqueous solution. The structure of the microspheres was characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and a zeta potential test. The effects of pH, adsorbent dosage, contact time, and temperature on adsorption ability were investigated. The results showed that T/C microspheres could combine Pb(II)ions via electrostatic attractions and physical adsorption. Adsorption kinetics could be better described by the pseudo-second-order kinetic model. The adsorption behaviors were in agreement with the Langmuir adsorption isotherm model with a fitting correlation coefficient of 0.9992. The maximum adsorption capacity was 23.75 mg/g from the Langmuir isotherm evaluation at 308K with an initial pH of 5. The results suggested that tannin/cellulose microspheres could be a low-cost and effective adsorbent for removing Pb(II) ions from aqueous solution.

scholarly journals Synthesis and application of surface-modified NiFe nanoparticles as a new magnetic nano adsorbent for the removal of nickel ions from aqueous solution

2017 ◽  
Vol 76 (10) ◽  
pp. 2851-2857 ◽  
Author(s):  
Yan Liu ◽  
Xiaoyi Shen
Keyword(s):  
Aqueous Solution ◽  
Sodium Citrate ◽  
Diffusion Processes ◽  
Order Kinetic ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Nickel Ions ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Surface Modified

Abstract Surface-modified magnetic Ni2.33Fe alloy nanoparticles were prepared using a hydrothermal method. Thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FTIR) tests demonstrated that the surface was successfully modified by sodium citrate. The surface-modified particles can be used for removing nickel ions from aqueous solution. The adsorption kinetics studies were performed and the pseudo-second-order kinetic model successfully described the kinetic data. The diffusion model indicated the adsorption was regulated by both surface and intraparticle diffusion processes. The Freundlich and Langmuir adsorption models were adopted for the mathematical description of adsorption equilibrium, and it was found that the experimental data fitted very well to the Freundlich model.

scholarly journals Removal of Lead(II) from Synthetic Wastewater by Lavandula pubescens Decne Biosorbent: Insight into Composition–Adsorption Relationship

2020 ◽  
Vol 10 (21) ◽  
pp. 7450
Author(s):  
Ali Q. Alorabi ◽  
Fahad A. Alharthi ◽  
Mohamed Azizi ◽  
Nabil Al-Zaqri ◽  
Adel El-Marghany ◽  
...  
Keyword(s):  
Ion Concentration ◽  
Wild Plant ◽  
Synthetic Wastewater ◽  
Gas Chromatography Mass Spectrometry ◽  
Gas Liquid Chromatography ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Best Fit

In this work, the widely-abundant, cheap, wild plant Lavandula pubescens Decne was evaluated as an adsorbent for removing Pb(II) ions from wastewater. The chemical composition of the plant was partially isolated and characterized by the corresponding techniques, including gas chromatography–mass spectrometry, gas liquid chromatography, and FTIR spectroscopy. The adsorption capacity of the dried plant material for Pb(II) ions increased with increasing contact time, initial ion concentration, and temperature, while it decreased with increasing adsorbent dosage. The optimum condition for Pb(II) adsorption was determined as 550 mg/L initial metal concentration, pH ≤ 7, and 90 min of contact. The best fit for Pb(II) adsorption isotherms was the linear form of the Freundlich model; however, the maximum capacity indicated by Langmuir was 91.32 mg/g. The experimental data fit better the pseudo-second-order kinetic model (R2 = 0.969), suggesting chemisorption process. Thermodynamic data revealed an endothermic, nonspontaneous, and adsorption process favored at higher concentrations.

scholarly journals Preparation and Adsorption Properties of Biochar/g-C3N4 Composites for Methylene Blue in Aqueous Solution

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaodong Li
Keyword(s):  
Methylene Blue ◽  
Thermodynamic Parameters ◽  
Raw Materials ◽  
Order Kinetic ◽  
Adsorption Effect ◽  
Freundlich Model ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Doping Ratio

Using straw and urea as raw materials, biochar (BC) and g-C3N4 were prepared by oxygen-free pyrolysis at 300°C and 550°C. BC/g-C3N4 was prepared by loading different amounts of g-C3N4 onto the surface of biochar and characterized by SEM and FT-IR. The adsorption effect on methylene blue (MB) was investigated from the aspects of dosage and pH. The studies of adsorption equilibrium isotherms and the kinetic and the thermodynamic parameters on the BC/g-C3N4 adsorbents are discussed. The results showed that BC/g-C3N4 0.16 g/L with a doping ratio of 1 : 3 was added to the MB solution with an initial concentration of 50 mg/L and pH=11. The adsorption rate and adsorption amount were 96.72% and 302.25 mg/g, respectively. The adsorption process included surface adsorption and intraparticle diffusion, which conformed to the pseudo-second-order kinetic model and Langmuir-Freundlich model. Thermodynamic parameters (ΔG0<0, ΔH0>0, and ΔS0>0) showed that the adsorption reaction is spontaneous, which positively correlated with temperature.

Adsorption kinetics and isotherm of vanadium with melamine

2017 ◽  
Vol 75 (10) ◽  
pp. 2316-2321 ◽  
Author(s):  
Hao Peng ◽  
Zuohua Liu ◽  
Changyuan Tao
Keyword(s):  
Adsorption Kinetics ◽  
Impact Factors ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Adsorption Kinetics And Isotherm ◽  
Langmuir And Freundlich Models

Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428.57 mg vanadium/g melamine, and the Freundlich model showed the adsorption is privilege type.

Effectiveness and Mechanism of the In Situ Formed Iron Hydroxide (FeOxHy) towards the Removal of Phosphate by Coagulation and Adsorption

2013 ◽  
Vol 807-809 ◽  
pp. 1251-1257 ◽  
Author(s):  
Li Hua Sun ◽  
Xiao Lu Qi ◽  
Ya Jun Zhang
Keyword(s):  
Iron Hydroxide ◽  
Iron Phosphate ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Molar Ratios ◽  
Beneficial Effects ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Hydrolysis Of

This study prepares the in situ formed iron hydroxide (In situ FeOxHy) by the interactions between Fe3+ and OH- at different molar ratios of 1:0,1:1,1:2,and 1:3, and investigates the performance and mechanism involved in the removal of phosphate. The removal efficiency increases with elevated doses of FeOxHy and the maximum removal is observed to be in neutral pH ranges. The elevated ratios of OH- to Fe3+ inhibit the removal of phosphate whereas at low alkalinity,the introduction of OH- shows beneficial effects. The abovementioned four kinds of FeOxHy can rapidly adsorb most phosphate within 15 s, and the adsorption process can be well described by the Pseudo-second-order kinetic model. Freundlich model can well describe the adsorption of phosphorus onto these four FeOxHy. The adsorption of phosphate significantly decreases the zeta potential of these in situ FeOxHy. The MINITEQ software can indicate the species distribution of phosphate and iron salts, and the theoretical calculation indicates that the introduced OH- can promote the hydrolysis of Fe3+ especially in low alkalinity system,which can easily adsorb H2PO4- and HPO42- and form the multinuclear hydroxy iron phosphate complexes thereafter.

scholarly journals Chromium and nickel metal ions removal from contaminated water using Nigerian bentonite clay

2021 ◽  
Author(s):  
Jock Asanja Alexander ◽  
Oboh Oseribo Innocent ◽  
Uwem Ekwere Inyang ◽  
Ganchok Lawrence ◽  
Adeku Ojo
Keyword(s):  
Metal Ions ◽  
Bentonite Clay ◽  
Textural Properties ◽  
Order Kinetic ◽  
Nickel Metal ◽  
Batch Mode ◽  
Freundlich Model ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Maximum Removal

Abstract In this work bentonite clay was characterized and investigated for the adsorption of chromium and nickel metal ions from aqueous solution. The clay calcined at 650 °C was characterized for physical, chemical and textural properties. Nickel sulphate hexahydrate (NiSO4.6H2O) and chromium tri oxide (Cr2O3) solutions were used as metal model compounds to evaluate the adsorption efficiency of the clay in a batch mode. The initial metal ions concentration range from 10 to 50 mg/L and the maximum removal efficiency was 99.40% for Cr (III) and 71.50% for Ni (II) metal ions. Langmuir and Freundlich models were utilized for the analysis of adsorption equilibrium isotherm. The experimental data fitted well into Freundlich model for Cr (III) with regression coefficient (R2) of 0.996 and the Langmuir model for Ni (II) having R2 value 0.994. The Pseudo second order kinetic model fitted well for both chromium and nickel and their adsorption from single metal solutions followed the order Cr &gt; Ni. Highlight The local clay has not been reported in any scholarly journal or publication. Theremoval of nickel and chromium using this clay has been found effective. The dataobtained will form a baseline for references and learning purposes.

scholarly journals Removal of Direct 50 Dyes from Aqueous Solution Using Natural Clay and Organoclay Adsorbents

2015 ◽  
Vol 12 (1) ◽  
pp. 157-166 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Ph Value ◽  
Dye Adsorption ◽  
Hexadecyltrimethylammonium Bromide ◽  
Textile Dye ◽  
Order Kinetic ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Gibb’S Free Energy ◽  
Isotherm Equations

In this study, hexadecyltrimethylammonium bromide (HDMAB) - bentonite was synthesized by placing alkylammonium cation onto bentonite. Adsorption of textile dye such as direct Yellow 50 on natural bentonite and HDMAB -bentonite was investigated. The effects of pH, contact time,dosage clay and temperature were investigated experimentally .The Langmuir and Freundlish isotherms equations were applied to the data and values of parameters of these isotherm equations were evaluated. The study indicated that using 0.2 g of HDMAB (hexadecyltrimethylammonium bromide) lead to increase the percentage removal(R%) from 78% for pure bentonite to 99 %. The optimum pH value for the adsorption experiments was found to be pH=3 and therefore all the experiments were carried out at this pH value. The pseudo-second-order kinetic model agrees very well with the experimental results.Different thermodynamic parameters such as Gibb’s free energy, enthalpy and entropy of the on-going adsorption process have also been evaluated. The thermodynamic analyses of the dye adsorption on organoclay indicated that the system was endothermic in nature .

scholarly journals Adsorption of Barium and Zinc Ions by Mesoporous TiO2 with Chemosorbed Carbonate Groups

2019 ◽  
Vol 20 (3) ◽  
pp. 282-290 ◽  
Author(s):  
H. Vasylyeva ◽  
I. Mironyuk ◽  
I. Mykytyn ◽  
N. Danyliyk
Keyword(s):  
Physical Adsorption ◽  
Mesoporous Tio2 ◽  
Order Kinetic ◽  
Zinc Ions ◽  
Experimental Adsorption ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Efficient Adsorbent ◽  
Agitation Time

In the present paper the mesoporous TiO2 with chemosorbed carbonate groups was investigated as an adsorbent for the removal of Zn2+ and Ba2+ cations from aqueous solutions. The dependence of the adsorption values of Zn2+ and Ba2+ on the agitation time, solution’s acidity, and modification of surface of TiO2 was determined. The process of Zn2+ and Ba2+ adsorption fit well by Lagergren’s pseudo-second-order kinetic model. The equilibrium adsorption was investigated in the concentration of heavy metal’s ranges 27.46 mg/L - 7809 mg/L. The experimental data was approximated by Langmuir and DubininRadushcevich adsorption theories. The energy of adsorption Zn2+ and Ba2+ onto modified TiO2 and unmodified TiO2 was calculated using Dubinin-Radushkevich equations, and was found to be 15.82 - 9.399 kJ/mol, which corresponds to the mechanism of physical adsorption. The application of Langmuir theory to experimental adsorption data gives high R2, close to unit. Separation factor RL indicates, that adsorption Zn2+ and Ba2+ onto modified TiO2 is very favorable. Modified mesoporous ТіО2 is very efficient adsorbent toward Zn2+ and Ba2+ cations from their individual solutions as well as from their mixture, and able to compete with the best world analogues.

scholarly journals Cr(VI) adsorption from aqueous streams on eggshell membranes of different birds used as biosorbents

2020 ◽  
Vol 38 (9-10) ◽  
pp. 413-434
Author(s):  
Jessica Badillo-Camacho ◽  
Eulogio Orozco-Guareño ◽  
Gregorio G Carbajal-Arizaga ◽  
Ricardo Manríquez-Gonzalez ◽  
Icela D Barcelo-Quintal ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Membrane Surfaces ◽  
Adsorption Isotherm Models ◽  
Before And After ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Efficient Option

The discharges enriched with heavy metals, particularly Cr(VI), are a serious environmental problem. In this work, it is presented the use of biosorbents from eggshells membranes of ostrich, quail, duck and chicken; the membranes were easily prepared and studied for the removal of Cr(VI) from aqueous solutions. Maximum uptake of 1.41 mmol g−1 membrane permitted the identification of ostrich membrane as the material with the highest Cr(VI) uptake. N2 adsorption experiments permitted to classify ostrich membranes as mesoporous materials, since they had pore size of 14.8 nm. This represented an advantage on the nature of these membranes to be used as biosorbents with respect to other membranes. The adsorption isotherm models such as Langmuir and Freundlich were verified using experimental data. Langmuir model described the adsorption process satisfactorily at pH 1 and 2 whereas Freundlich model fitted data better at pH 3 and 5. The adsorption kinetic data were adjusted to a pseudo-second order kinetic model. TGA results permitted demonstrating a low thermal stability of ostrich membrane, since it starts decomposing at around 50°C due to the fact that membranes have about 60% protein. Through SEM microscopy was possible to observe the morphology of the membrane surfaces before and after Cr(VI) uptake which reflects the textural characteristics of the biosorbent. FTIR and XPS analyses suggested that Cr was adsorbed on ostrich membranes through the amine groups of proteins conforming the fibers of membranes. Despite the oxygen shows higher electronegativity than N, Cr shows more preference toward N due to fact that pH conditions favor the positive charges on the surface of the membrane. Our results make evident that this waste material is a novel and efficient option for the removal of Cr(VI) from aqueous solutions.

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