scholarly journals Sorption of Cobalt (II) Ions from Aqueous Solutions Using Chemically Modified Chitosan

2018 ◽  
Vol 20 (3) ◽  
pp. 620-627 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Absorption Spectrometry ◽  
Sorption Process ◽  
Experimental Conditions ◽  
Modified Chitosan ◽  
Rate Determining Step ◽  
Langmuir Isotherm Model ◽  
Uptake Process ◽  
Best Fit ◽  
Maximum Removal

<p>Removal of Co(II) ions from aqueous solutions using chitosan-vanillin (polymer I) and chitosan-ortho-vanillin (polymer II) adsorbents has been investigated under different experimental conditions. The effect of pH, contact time, adsorbent mass, temperature, and initial concentration of studied ion on the sorption process has been studied using batch experiments. The quantity of residual ion has been estimated via atomic absorption spectrometry. The highest removal of Co(II) ions has been achieved at pH 4 with a maximum removal of 93.2% of ions after two hours of agitation. Langmuir isotherm model represents the best fit for the experimental data; whereas the highest chelation capacity was 5.899 mg g-1 and 7.651 mg g-1 for polymers I and II, respectively. Results from this study imply that chemisorption is the rate-determining step and thermodynamic parameters indicate that the uptake process is spontaneous and endothermic in nature.</p>

scholarly journals Estimation the Sorption Capacity of Chemically Modified Chitosan Toward Cadmium Ion in Wastewater Effluents

2019 ◽  
Vol 35 (2) ◽  
pp. 757-765 ◽  
Author(s):  
Eman A. Alabbad
Keyword(s):  
Kinetic Studies ◽  
Absorption Spectrometry ◽  
Sorption Process ◽  
Experimental Conditions ◽  
Thermodynamic Studies ◽  
Modified Chitosan ◽  
Ion Removal ◽  
Chemically Modified ◽  
Langmuir Isotherm Model ◽  
Influence Of Ph

This study aimed to investigation of Cd(II) ion removal from wastewater using chitosan-vanillin as sorbent I and chitosan-ortho-vanillin as sorbent II under various experimental conditions. The influence of pH, initial Cd(II) ion concentrations and isotherm studies, temperature and thermodynamic studies, adsorbent mass, adsorption time and kinetic studies on the sorption process have been studied using different experiments. The residual ion quantity is estimated through atomic absorption spectrometry. The maximum Cd(II) ion removal is obtained at pH 6 with highest uptake of ions after agitation for 2 hours. Langmuir isotherm model represented the most suitable for the experimental data and the maximum adsorbing capacity was 20.704 mg g-1 and 51.020 mg g-1 for sorbents I and II, respectively. Results of this study suggest that chemisorption is a step of rate-determining and the thermodynamic studies revealed that the nature of uptake sorption process is endothermic and spontaneous.

scholarly journals Removal of Dye Acid Red 1 from Aqueous Solutions Using Chitosan-iso-Vanillin Sorbent Material

2020 ◽  
Vol 5 (3) ◽  
pp. 352-365
Author(s):  
Eman Al Abbad ◽  
Fadi Alakhras
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Modified Chitosan ◽  
Sorbent Material ◽  
Removal Capacity ◽  
Rate Determining Step ◽  
Acid Red 1

Sorption of Acid Red 1 (AR1) from aqueous solutions utilizing low-cost sorbent material; (chitosan-iso-vanillin) is studied under batch conditions. The remaining concentrations of the azo dye are measured at λmax = 546 nm by UV spectrophotometric method. Langmuir data reveal that the maximum removal capacity was 555.556 mg/g at pH 3. Freundlich isotherm represents the best fitting model on the removal of AR1 using chemically modified chitosan verifying the sorption takes place on heterogeneous surfaces with multilayer adsorption. Kinetic studies of the sorption process revealed that intraparticle diffusion is not only the rate-determining step but also a chemical reaction takes place as well. The results indicate that high sorption rapidness with almost 90% achieved within 90 min. Thermodynamic investigations suggest that the process favours an exothermic nature. The polymer utilized in the present study is being considered as a feasible sorbent material for the removal of AR1 from waste effluent.

scholarly journals Biosorption of Pb (II) from aqueous solutions by modified of two kinds of marine algae, Sargassum glaucescens and Gracilaria corticata

2012 ◽  
Vol 14 (2) ◽  
pp. 22-28 ◽  
Author(s):  
Akbar Esmaeili ◽  
Mona Kalantari ◽  
Betsabe Saremnia
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Marine Algae ◽  
Rate Model ◽  
Initial Concentration ◽  
Batch System ◽  
Gracilaria Corticata ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Maximum Removal

Biosorption of Pb (II) from aqueous solutions by modified of two kinds of marine algae, Sargassum glaucescens and Gracilaria corticata In this research, the batch removal of Pb2+ ions from wastewater and aqueous solution with the use o two different modified algae Gracilaria corticata (red algae) and Sargassum glaucescens (brown algae) was examined. The experiment was performed in a batch system and the effect of the pH solution; initial concentration and contact time on biosorption by both biomasses were investigated and compared. When we used S. glaucescens as a biosorbent, the optima conditions of pH, Pb2+ concentration and equilibrium time were at 5, 200 mg/L and 70 min, in the range of 95.6% removal. When G. corticata was used for this process, pH 3, 15 mg/L pb2+ concentration and 50 min contact time, resulted in the maximum removal (86.4%). The equilibrium adsorption data are fitted to the Frundlich and Langmuir isotherm model, by S. glaucescens and G. corticata, respectively. The pb2+ uptake by both biosorbent was best described by the second-order rate model.

Removal of Mercury From Aqueous Solutions by ETS-4 Microporous Titanosilicate: Effect of Contact Time, Titanosilicate Mass and Initial Metal Concentration

2007 ◽  
Author(s):  
C. B. Lopes ◽  
M. Otero ◽  
Z. Lin ◽  
E. Pereira ◽  
C. M. Silva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Sorption Process ◽  
Exchange Equilibrium ◽  
Toxic Heavy Metals ◽  
Experimental Conditions ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
Microporous Titanosilicate

Mercury is one of the most toxic heavy metals present in the environment and therefore is extremely important develop new, simple and reliable techniques for its removal from aqueous solutions. A recent line of research within this context is the application of microporous materials. The use of these materials for removing heavy metals from solutions may become a potential clean-up technology in the field of wastewater treatment. In this work it is reported the application of microporous titanosilicate ETS-4 as ion exchanger to remove Hg2+ from aqueous solution. Under batch conditions, we studied the effect of contact time, titanosilicate mass and initial Hg2+ concentration. Only 5 mg of ETS-4 are required to purify 2 litres of water with 50 μg L−1 of metal. Under the experimental conditions, the initial Hg2+ concentration and ETS-4 mass have strong influence on the sorption process, and it is proved that 24 h are almost always sufficient to attain ion exchange equilibrium. Langmuir and Freundlich isotherms were used to fit equilibrium experimental results. The kinetics of mercury removal was reliably described by a pseudo second-order model. On the whole, ETS-4 shows considerable potential to remove Hg2+ from wastewaters.

scholarly journals Removal of potentially toxic elements from aqueous solutions and industrial wastewater using activated carbon

2017 ◽  
Vol 75 (11) ◽  
pp. 2571-2579 ◽  
Author(s):  
Muhammad Sajjad ◽  
Sardar Khan ◽  
Shams Ali Baig ◽  
Saduf Munir ◽  
Alia Naz ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Toxic Elements ◽  
Potentially Toxic Elements ◽  
Column Experiments ◽  
Langmuir Isotherm Model ◽  
Key Issues ◽  
Maximum Removal ◽  
Cr Removal

Water contamination with potentially toxic elements (PTEs) has become one of the key issues in recent years that threatens human health and ecological systems. The present study is aimed at removing PTEs like cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) from aqueous solutions and industrial wastewater using activated carbon (AC) as an adsorbent through different batch and column experiments. Results demonstrated that the removal of PTEs from aqueous solutions was highly pH dependent, except for Cr, and the maximum removal (&gt;78%) was recorded at pH 6.0. However, maximum Cr removal (82.8%) was observed at pH 3.0. The adsorption reached equilibrium after 60 min with 2 g of adsorbent. Coefficient (R2) values suggested by the Langmuir isotherm model were 0.97, 0.96, 0.93 and 0.95 for Cd, Cr, Cu and Pb, respectively, indicating the fit to this model. In column experiments, the maximum removal of PTEs was observed at an adsorbent bed height of 20 cm with the optimal flow rate of 3.56 mL/min. Furthermore, PTEs removal by AC was observed in the order of Cu &gt; Cd &gt; Pb &gt; Cr. Findings from this study suggest that AC could be used as a promising adsorbent for simultaneously removing several PTEs from wastewaters.

scholarly journals Coffee Biomass Encapsulated in Calcium Alginate as Material for Lead (II) Adsorption from Aqueous Solutions

2021 ◽  
Vol 10 (1) ◽  
pp. 72-83
Author(s):  
Sarina Hanifah ◽  
◽  
Rusnadi Rusnadi ◽  
M. Bachri Amran ◽  
◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Calcium Alginate ◽  
Maximum Adsorption Capacity ◽  
Experimental Conditions ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Agitation Time ◽  
Adsorbent Dose

This work aims to study the removal of lead (II) from aqueous solutions with Ca-Alginate (CA) and Coffee-Calcium-Alginate (CCA). The coffee biomass were successfully prepared as the material to be encapsulated in calcium alginate. The characterization of the synthesized CA and CCA was performed using fourier transform infrared and scanning electron microscopy. The method used was batch study. Various factors which affected adsorption efficiency of lead (II) ions by CA and CCA, such as pH, agitation time, and adsorbent dose were investigated for determination of optimum experimental conditions. The result showed that CA and CCA had significant effects on adsorption of lead (ІІ) ions at pH = 4, agitation time of more than 120 min, and the adsorbent dose was 0.05 gram. Moreover, the Langmuir isotherm model showed that maximum adsorption capacity (qm) was 163.66 mg/g and 176.99 mg/g respectively for CA and CCA. The Langmuir isotherm was better described the adsorption equilibrium. Both of the adsorbent fitted to pseudo second order equations. These results demonstrated that CA and CCA show great potential to remove Pb(ІІ) ions from aqueous solutions.

scholarly journals Removal of Copper(II) Ions from Aqueous Solutions. I. Adsorption Studies Using Powdered Marble Wastes as Sorbent

2003 ◽  
Vol 21 (3) ◽  
pp. 285-296 ◽  
Author(s):  
S.E. Ghazy ◽  
S.E. Samra ◽  
A.M. Mahdy ◽  
S.M. El-Morsy
Keyword(s):  
Aqueous Solutions ◽  
Environmental Problem ◽  
Sorption Process ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Adsorption Models ◽  
First Order ◽  
Inorganic Sorbent ◽  
First Order Kinetics

Batch adsorption experiments of copper(II) ions from aqueous solutions on to powdered marble wastes (PMW) have been performed. The latter is an effective inorganic sorbent which is inexpensive, widespread and may represent an environmental problem. The main parameters influencing the sorption process, i.e. initial solution pH, sorbent and Cu2+ ion concentrations, stirring times and temperature, were examined. The results obtained revealed that the sorption of Cu2+ ions on to PMW was endothermic in nature and followed first-order kinetics. Moreover, it was well described by the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) adsorption models over the concentration range studied. Under the optimum experimental conditions employed, the removal of ca. 100% Cu2+ ions was attained.

Magnetic nanocomposite beads: synthesis and uptake of Cu(II) ions from aqueous solutions

2015 ◽  
Vol 93 (3) ◽  
pp. 289-296 ◽  
Author(s):  
Al-Sayed A. Bakr ◽  
Yasser M. Moustafa ◽  
Mostafa M.H. Khalil ◽  
Mohamed M. Yehia ◽  
Eman A. Motawea
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Magnetic Nanocomposite ◽  
Order Model ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Solution Ph ◽  
Pseudo Second Order ◽  
Uptake Process ◽  
Maximum Removal

Sodium alginate and magnetic iron oxide nanoparticles were combined to produce magnetic nanocomposite beads that were used for the removal of Cu(II) from aqueous solutions at a temperature of 25 °C and a stirring rate of 150 rpm. The different parameters affecting the adsorption capacity of the synthesized material such as contact time (30–270 min), pH (3–7), adsorbent dosage (5–10 g per 50 mL of wet beads), and initial Cu(II) concentration (50–450 mg/L) were investigated. Of all of the variables, the solution pH has the most significant effect on the adsorption capacity, particularly in the range of 4–6. Response surface methodology was used for modeling and optimizing the uptake process. While the experimental data were well described by the pseudo-second-order model, the adsorption isotherms were better fitted by the Langmuir equation. The results revealed that the maximum removal percentage was 92.6% from the initial Cu(II) concentration (150 mg/L) at pH 6, adsorbent dose (8.0 g/50 mL), and contact time (210 min). Therefore, the synthesized magnetic nanocomposite product could act as a highly effective nanoadsorbent in Cu(II) removal from the aqueous solutions.

scholarly journals Removal of Copper(II) Ions from Aqueous Solutions by Hydroxyapatite-Based Materials Prepared from Eggshells

2019 ◽  
Vol 70 (6) ◽  
pp. 1897-1902
Author(s):  
Claudia Maria Simonescu ◽  
Alina Melinescu ◽  
Maria Ciuca ◽  
Bianca Zarnescu
Keyword(s):  
Aqueous Solutions ◽  
Ph Value ◽  
Sorption Process ◽  
Raw Material ◽  
Main Process ◽  
Retention Capacity ◽  
Homogeneous Surface ◽  
Water Treatment Process ◽  
Rate Determining Step ◽  
Potential Applications

The experimental study aimed to establish the potential applications of the nano- and micrometric powders of hydroxyapatite in the removal processes of Cu(II) ions from synthetic aqueous solutions. For this purpose, hydroxyapatite (HAP) was used in the form of: 1) nanometric powder (labeled nano-HAP), and 2) calcium alginate hydroxyapatite composite microparticles (nicro-HAP-CaAlg). Eggshells have been used as a raw material to obtain HAP. The contact time, pH and Cu(II) concentration in the initial solution have been the main process variables with influence on the Cu(II) ions removal by HAP samples. For both HAP based materials, an optimal pH value of 5 has been established. The nano-HAP powder has a higher Cu(II) adsorption capacity than micro-HAP-CaAlg based on the specific surface area values of nano- and micrometric powders. The adsorption isotherm experiments showed that this process can be described using Langmuir model according to which the adsorption takes place as a monolayer process on an homogeneous surface. The kinetic study revealed that the sorption process of Cu(II) from synthetic aqueous solutions can be described using the pseudo-second order kinetics model according to which the rate-determining step is chemisorption. The values of the retention capacity recommends both powders tested (nano-HAP and micro-HAP-CaAlg) to be used in the Cu(II) loaded water treatment process.

Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 69 (5) ◽  
pp. 1233-1239
Author(s):  
Raluca Madalina Senin ◽  
Ion Ion ◽  
Ovidiu Oprea ◽  
Rusandica Stoica ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Adsorption Process ◽  
Sorption Process ◽  
Multiwalled Carbon ◽  
Before And After ◽  
Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

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