scholarly journals The Elimination by Natural Algerian Clay of Chromium Ions from Salt Water

2021 ◽  
Vol 45 (2) ◽  
pp. 105-112
Author(s):  
Rachid Chebbi ◽  
Amar Fadel ◽  
Amel Aidi
Keyword(s):  
Metal Ion ◽  
Salt Water ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Adsorption Method ◽  
Retention Capacity ◽  
Chromium Ions ◽  
Stirring Time

This paper studies the removal of chromium ions from synthetic brackish water by an adsorption method using natural Algerian Bentonite (NAB), the mineral clay was characterized through FTIR, XRD and SEM/EDS analysis. The effect of the main physicochemical parameters; namely: clay dosage, initial metal ion concentration, pH, and contact time on the removal of Cr+3 was investigated. The results showed that equilibrium was attained within 5 minutes of stirring time. The retention capacity of Cr+3 increased with the increase of adsorbent dose and decreased with the increased initial metal ion concentration. The Langmuir and Freundlich isotherm models were applied to determine the efficiency of bentonite used as an adsorbent. According to the obtained results, the Langmuir model adjusts very well to the experimental data. Based on the kinetic studies for the raw bentonite, it was verified that the mechanism corresponds to predominant pseudo-second- order adsorption.

Moringa oleifera seeds for single and simultaneous removal of Pb2+ and Cd2+ from aqueous solutions

2020 ◽  
Author(s):  
Mohamed Abatal ◽  
Yaneth Stephanie Durán Avendaño ◽  
M. Teresa Olguin ◽  
Joel Vargas
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Moringa Oleifera ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Sorption Data ◽  
Batch Tests ◽  
Pseudo Second Order

<p>In this study, we report the effectiveness of natural and NaOH treated Moringa oleifera seeds for single and simultaneous Pb<sup>2+ </sup>and Cd<sup>2+</sup> from aqueous solutions. The biosorbent was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) techniques. The pH of point zero charge (pH<sub>pzc</sub>) was determined. Effects of contact time (15-1440 min), pH of solutions (2-10), mass of biosorbent (0.1-0.5 g) and initial metal ion concentration (10-1000 mg/L) were investigated using batch tests. The results show the pretreatment of biosorbent by NaOH improve significantly uptake capacity (mg/g) of the metal ions (q (Pb<sup>2+</sup>) = 38.45 and q (Cd<sup>2+</sup>) = 17.32 ˃ q (Pb<sup>2+</sup>) = 31.45 and q (Cd<sup>2+</sup>)= 14.67). Kinetic studies shown that the more than 90 % uptake of ion metals occurring within 120-180 min and the experimental data were better describe by a pseudo-second-order model. The sorption data for non-treated and NaOH treated Moringa oleifera seeds were evaluated by the Freundlich isotherm models to describe the adsorption equilibrium.</p>

scholarly journals Adsorption of Cr6+ Onto Unmodified and Hydrochloric Acid Modified African Nutmeg Pod (Monodora myristica) from Aqueous Solution

2019 ◽  
pp. 1-8
Author(s):  
F. U. Okwunodulu ◽  
H. O. Chukwuemeka-Okorie ◽  
N. M. Mgbemena ◽  
J. B. I. Kalu
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Low Ph ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Particle Sizes ◽  
Monodora Myristica ◽  
Best Fit

The removal of Cr6+ from aqueous solution using unmodified and hydrochloric modified African nutmeg pod was studied. The effects of particle size, pH and initial metal ions concentration adsorbed were investigated. The amount of metal ion adsorbed increased as the initial metal ion concentration increased and also decreased at low pH of 2 for both modified and unmodified African nutmeg pod.  400 µm and 250 µm were the optimum particle sizes for both modified and unmodified African nutmeg pod respectively, values given as 75.8 mg/g for the modified and 93.39 mg/g for the unmodified. Generally, it was observed that the unmodified African nutmeg pod showed greater adsorption capacity than the modified African nutmeg pod. The equilibrium experimental data were examined via Langmuir and Freundlich isotherm models.  Freundlich isotherm model gave the best fit for the data in both unmodified and modified African nutmeg pod based on the correlation coefficients (R2 values) gotten. The results of the study showed that the African nutmeg pod is efficient for the removal of Cr6+ from aqueous solutions especially when unmodified.

scholarly journals Effective Biosorption of Nickel(II) from Aqueous Solutions UsingTrichoderma viride

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
P. Sujatha ◽  
V. Kalarani ◽  
B. Naresh Kumar
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Low Cost ◽  
Trichoderma Viride ◽  
Toxic Metal ◽  
Freundlich Isotherm ◽  
Recovery Process ◽  
Primary Objective ◽  
Ion Concentration ◽  
Isotherm Models

The primary objective of the present study is to evaluate the optimization conditions such as kinetic and equilibrium isotherm models involved in the removal of Ni(II) from the aqueous solutions byTrichoderma viride. The biosorbent was characterized by FTIR and SEM. The optimum biosorption conditions were determined as a function of pH, biomass dosage, contact time, initial metal ion concentration, and temperature. The maximum Ni(II) biosorption was obtained at pH 4.5. The equilibrium data were better fit by the Langmuir isotherm model than by the Freundlich isotherm. The kinetic studies indicate that the biosorption process of the metal ion Ni(II) has followed well the pseudo-second-order model. The sum of the square errors (SSE) and chi-square (χ2) tests were also carried out to find the best fit kinetic model and adsorption isotherm. The maximum biosorption capacity (qm) ofT.viridebiomass was found to be 47.6 mg/g for Ni(II) ion. Therefore, it can be concluded thatT.viridebiomass was effective and low-cost potential adsorbent to remove the toxic metal Ni(II) from aqueous solutions. The recovery process of Ni(II) fromT.viridebiomass was found to be higher than 98% by using 0.25 M HNO3. Besides the application of removal of toxic metal Ni(II) from aqueous solutions, the biosorbentT.viridecan be reused for five consecutive sorption-desorption cycles was determined.

scholarly journals Utilization of Activated Carbon Prepared from Industrial Solid Waste for the Removal of Chromium(VI) Ions from Synthetic Solution and Industrial Effluent

2005 ◽  
Vol 23 (2) ◽  
pp. 145-160 ◽  
Author(s):  
N. Vennilamani ◽  
K. Kadirvelu ◽  
Y. Sameena ◽  
S. Pattabhi
Keyword(s):  
Activated Carbon ◽  
Metal Ion ◽  
Industrial Effluent ◽  
Carbon Adsorbent ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Adsorption Sites ◽  
Chromium Vi ◽  
Sago Waste

Activated carbon (AC) prepared from sago waste was characterized and used to remove chromium(VI) ions from aqueous solution and industrial effluent by adsorption methods using various conditions of agitation time, metal ion concentration, adsorbent dosage particle size and pH. Surface modification of the carbon adsorbent with a strong oxidizing agent like concentrated H2SO4 generates more active adsorption sites on the solid surface and pores for metal ion adsorption. Adsorption of the metal ion required a very short time and led to quantitative removal. Both the Langmuir and Freundlich isotherm models could describe the adsorption data. The calculated values of Q0 and b were 5.78 mg/g and 1.75 1/min, respectively. An effective adsorption capacity was noted for particle sizes in the range 125–250 μm at room temperature (30 ± 2°C) and an initial pH of 2.0 ± 0.2. The specific surface area of the activated carbon was determined and its properties studied by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR). These studies revealed that AC prepared from sago waste is suitable for the removal of Cr(VI) ions from both synthetic and industrial effluents.

scholarly journals Comparative Study on the Adsorption Kinetics and Thermodynamics of Metal Ions onto Acid Activated Low Cost Pandanus Carbon

2007 ◽  
Vol 4 (2) ◽  
pp. 238-254 ◽  
Author(s):  
R. Sudha ◽  
K. Kalpana ◽  
T. Rajachandrasekar ◽  
S. Arivoli
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Ion Concentration ◽  
Effect Of Temperature ◽  
Ferrous Ions ◽  
Sem Images ◽  
Operating Variables

Batch experiments were carried out for the sorption of Copper and Ferrous ions onto acid activated carbon prepared. The operating variables studied were initial metal ion concentration, pH, and temperature and contact time. The equilibrium data were fitted to the Langmuir and Freundlich isotherm equations. From this adsorption efficiency, adsorption energy, adsorption capacity, intensity of adsorption and dimensionless separation factor were calculated. From the kinetic studies the rate constant values for the adsorption process was calculated. From the effect of temperature thermodynamic parameters like ΔG°, ΔH°, and ΔS° were calculated. The mechanism of adsorption for metal ions onto carbon was investigated by using the experimental results and confirmed by FT- IR, XRD and SEM images.

scholarly journals Silver sorption on acrylic copolymers functionalized with amines. Equilibrium and kinetic studies

2009 ◽  
Vol 7 (4) ◽  
pp. 827-835 ◽  
Author(s):  
Rodica Buhaceanu ◽  
Ioan Sarghie ◽  
Adriana Barsanescu ◽  
Viorica Dulman ◽  
Ioan Bunia
Keyword(s):  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Second Order ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Crosslinking Degree ◽  
Acrylic Copolymers ◽  
Best Fitting ◽  
Pseudo Second Order ◽  
Good Agreement

AbstractThe sorption capacity of three weak base ion exchangers based on acrylic copolymers functionalized with ethylenediamine, triethylenetetramine and N, N- dimethylamino propylamine for Ag(I) ions was evaluated. Adsorption experiments were carried out by batch method. The effect of pH, crosslinking degree of copolymers, amount of sorbent, initial ion concentration, contact time and temperature was studied. The parameters which characterize the retention process were estimated using Langmuir and Freundlich isotherm models, the best fitting being for the first model. Kinetic data were fitted to pseudo-first order, pseudo-second order and intraparticle diffusion models. Experimental data were in good agreement with the pseudo second order.

scholarly journals Adsorptive removal of Pb(II) ions from aqueous solution by activated carbon prepared from cabbage waste

2020 ◽  
Vol 8 ◽  
pp. 1-10
Author(s):  
Keshav Raj Paneru ◽  
Binay Kumar Jha
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Specific Surface ◽  
Metal Ion ◽  
Activated Carbons ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Adsorption Method ◽  
Surface Areas

The present study deals with the adsorption of Pb(II) from an aqueous solution on activated carbon obtained from cabbage waste. Such activated carbon was prepared by pyrolysis of cabbage waste powder at 700 °C for 1 hour in three different atmospheres, namely open air (CWAC-O), nitrogen (CWAC-N) and nitrogen with steam (CWWAC-NW). The specific surface areas of thus obtained three types of activated carbons were determined by methylene blue adsorption method and found for CWAC-O, CWAC-N and CWAC-NW as 59, 169 and 310 m2/g, respectively. Due to the highest specific surface area of CWAC-NW, the adsorption of Pb(II) experiments was performed onto CWAC-NW only. The influence of various parameters like pH, adsorbent dose, contact time and different initial concentrations of metal ion on adsorption of Pb(II) were studied. The equilibrium data for adsorption was analyzed by using Langmuir and Freundlich isotherm models. The Langmuir adsorption isotherm model was found the best fit for the experimental data. The maximum adsorption capacity was 54.945 mg/g. Kinetics results were described by a pseudo second order model with the rate constant value 0.055 g/(mg∙min). The main mechanism of the adsorption process was physicochemical adsorption and was not solely intraparticle diffusion.

scholarly journals Characterization of Activated Coconut Shell Charcoal as a Zinc Absorbent for Used Oil Lubricant

2020 ◽  
Vol 15 (2) ◽  
pp. 111-122
Author(s):  
Emi Erawati ◽  
Haryanto Haryanto ◽  
Neysa Wirantika Astuti ◽  
Annida Mitha Prasetyanti
Keyword(s):  
Metal Ion ◽  
Mesh Size ◽  
Freundlich Isotherm ◽  
Toxic Waste ◽  
Coconut Shell ◽  
Lubricating Oil ◽  
Isotherm Models ◽  
Adsorption Method ◽  
Coconut Shells ◽  
Zinc Adsorption

Lubricating oil is classified as B3 waste (hazardous and toxic waste). In the lubricating oil consists of zinc waste which is very dangeraous for healt and environment. So that to handle lubricating oil is used the adsorption method using coconut shell as adsorbent. This study aims to determine the efficiency of zinc adsorption on lubricating oil with stirring speed, percent solvent, mesh size, and mass of adsorbent variation; to learn the equibilium equation of adsorpsion of Zn metal ion on the activated carbon of coconut shell charcoal using Freundlich and Langmuir equilibirium; and to calculate adsorbtion kinetic constanta using the pseudo first model or pseudo second order kinetics approach. Coconut shells was heated at a temperature of 300ᴼC for 1 hour for the driving process . Furthermore, charcoal was soaked in 25% HCl for 18 hours. After being neutralized to pH 7, the charcoal was activated for 3 hours at a temperature of 500ᴼC and stored in a closed place. Coconut shell adsorbent and H2SO4 solvent were put into a beaker glass containing 400 ml of lubricating oil and stirred for 2 hours, every 30 minutes intervals were taken 50 ml to destruction for 2 hours with 68% HNO3. The zinc concentration before and after adsorption were measured using AAS. This study uses the Langmuir isotherm and Freundlich Isotherm models. The greatest efficiency of zinc adsorption with solvent percent variation 0.5% is 95.0567% and 99.9375% in adsorbent mass variation of 10 gram. 

Biosorption of Cadmium onto Pseudomonas fluorescens: Application of Isotherm and Kinetic Models

2010 ◽  
Vol 171-172 ◽  
pp. 49-52 ◽  
Author(s):  
Chang Li Yu ◽  
Zhi Peng Lu ◽  
Fa Zhi Ge ◽  
Er Li Zhao
Keyword(s):  
Pseudomonas Fluorescens ◽  
Functional Groups ◽  
Metal Ion ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Rate Equations ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Isotherm And Kinetic Models

The present study was undertaken to evaluate the feasibility of Pseudomonas fluorescens biomass for the removal of cadmium ions from aqueous solutions. Batch experiments were performed to study the adsorption of cadmium on pH, Pseudomonas fluorescens biomass adsorbent with respect to initial Cd(II) concentration, contact time and biomass dose. The experimental data were modeled by Langmuir and Freundlich isotherm models. Langmuir model resulted in the best fit of the adsorption data. The maximum adsorption capacity for Cd(II) was 66.25 mg/g (pH 5.0 and 5 g/L biomass dose). Kinetics of adsorption followed second-order rate equations. The FTIR results of Pseudomonas fluorescens biomass showed that biomass has different functional groups and these functional groups are able to react with metal ion in aqueous solution. The results of the present study suggest that Pseudomonas fluorescens biomass can be used beneficially in treating industrial effluents containing heavy metal ions.

scholarly journals Adsorption-Kinetic Studies of Mordant Exhaust Dyeing of Cotton and Silk Fabrics with Dye Extract of M. lucida Plant Species

2021 ◽  
Vol 75 ◽  
Author(s):  
Janani Loum ◽  
Robert Byamukama ◽  
P.A.G. Wanyama
Keyword(s):  
Adsorption Isotherms ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Reaction Orders ◽  
Dyed Fabrics ◽  
Silk Fabrics ◽  
Exhaust Dyeing ◽  
Traditional Natural

ABSTRACT The kinetics and adsorption isotherms of the extremely slow traditional natural exhaust dyeing that takes many hours or days have been studied purposely to find means of improving the process. The dyeing of cotton and silk fabrics using dye extract of M. lucida at 50 °C were elucidated with graphs to predict the reaction orders and identify the appropriate adsorption isotherm model(s). Since the dye is UV active, changes in UV absorbance were used in place of changes in concentrations. The simultaneous and post mordanting methods followed pseudo-second-order reactions, hence chemisorption. However, mordant application to the dyed fabrics during post mordant followed a pseudo-first-order model, largely physisorption. Dyeing has followed Langmuir and Freundlich isotherm models with linear correlation r2 ranging between 1 and 0.998. From the Freundlich model and values of Langmuir constant RL (0.9307 to 1.0), the process is homogeneous, forming a favourable and linear monolayer. Accordingly, the dyeing speed can be improved by increasing the concentration of dye liquor. Additionally, according to the Freundlich model, higher dye intensity on fabrics is recorded in post mordanting. Keywords: adsorption isotherms, equilibrium, exhaust dyeing, mordant, rate law

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