scholarly journals Removal of fluoride from an aqueous solution by batch and column process using activated carbon derived from iron infused Pisum sativum peel: characterization, Isotherm, kinetics study

2020 ◽  
Vol 26 (4) ◽  
pp. 200241-0
Author(s):  
Naincy Sahu ◽  
Chandra Bhan ◽  
Jiwan Singh
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Pisum Sativum ◽  
Freundlich Isotherm ◽  
Adsorptive Capacity ◽  
Fluoride Removal ◽  
Batch Adsorption ◽  
Waste Biomass ◽  
X Ray Diffraction ◽  
Pseudo Second Order

The present study investigated the adsorption efficiency of magnetic activated carbon was synthesized by waste biomass of Pisum sativum (peel) and pyrolysis at 500˚C temperature (MPPAC-500). Derived activated carbon was applied for removal of fluoride from aqueous solution. The MPPAC-500 was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), zeta potential, X-ray Diffraction (XRD) and Particle Size Analyser. The fluoride sequestration study was performed in both batch and column systems. The batch adsorption study was focused on parameter like, adsorbent dose, contact time, pH and initial fluoride concentrations. The maximum capacity of fluoride removal was qo = 4.71 (mg/g). Freundlich isotherm model (R2 -0.995) obeyed better than Langmuir (R<sup>2</sup> -0.979) model. The RL values observed between 0-1 (RL-0.057) inferred the favourable adsorption. Pseudo-second-order model favoured well than pseudo-first-order in the whole experimental data. In case of column study was performed at two different bed height 5 cm and 10 cm having flow rate of 5 mL/min as well as 10 mL/min. The breakthrough curve and column data were interpreted by Thomas, Adams-Bohart, Yoon-Nelson and Clark model. These finding showed that MPPAC-500 has potential adsorptive capacity for fluoride removal from aqueous solutions in batch and column systems.

scholarly journals Adsorption Phenomenon of Arundinaria alpina Stem-Based Activated Carbon for the Removal of Lead from Aqueous Solution

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yosef Asrat ◽  
Amare Tiruneh Adugna ◽  
M. Kamaraj ◽  
Surafel Mustefa Beyan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
Synthetic Solution ◽  
Temperature Ranges

In this study, activated carbon was prepared from locally available bamboo (Arundinaria alpina) in Ethiopia to remove Pb (II) from wastewater. Various effects such as solution pH, initial Pb (II) ion concentration, and adsorbent dose were investigated and accordingly discussed, and the process was carried out on a batch adsorption base. Dried Arundinaria alpina stem was activated with potassium hydroxide (KOH) at a ratio of 1 : 1 (w/v) and carbonized in a furnace at three temperature ranges (500oC, 600oC, and 700oC) for 3 h. The physicochemical of Arundinaria alpina stem activated carbon (AASAC) was investigated and the resultant of 500oC treatment setup is found as ideal in terms of yield (40.6 g), ash (3.5%), porosity (0.704%), moisture (7.7%), and iodine number (814.69 mg/g). The further characterization of ideal AASAC was carried out by scanning electron microscopy (SEM), X-ray diffraction (XRD) spectroscopy, and Fourier transform infra-red (FTIR). The optimum Pb (II) removal efficiency of AASAC was 99.8% at pH 5 in a synthetic solution, but the efficiency declined to 60.42% on real industrial wastewater due to the presence of its mixed pollutant nature. Freundlich isotherm model is more favorable than Langmuir with a high correlation coefficient (R2-0.9496) for Pb (II) adsorption. The study revealed that AASAC has a potential adsorption efficiency to remove the Pb (II) ion from the aqueous solution which is also recommended as an adsorbent for real industry wastewater treatment.

scholarly journals Aluminum–cerium double-metal impregnated activated carbon: a novel composite for fluoride removal from aqueous solution

2016 ◽  
Vol 17 (1) ◽  
pp. 115-124 ◽  
Author(s):  
Shreeya Kalidindi ◽  
Mounica Vecha ◽  
Arkamitra Kar ◽  
Trishikhi Raychoudhury
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Synthesis Temperature ◽  
Fluoride Removal ◽  
Equilibrium Sorption ◽  
Wide Range ◽  
Kinetic Tests ◽  
Double Hydroxide ◽  
Partitioning Behavior

Several studies have focused on the application of layered double hydroxide or nanoparticle based adsorbent for removing fluoride. The objectives of this study are to impregnate aluminum (Al) and cerium (Ce) within the pore spaces of activated carbon (AC) for removal of fluoride from water and to evaluate the partitioning behavior of fluoride by the double-metal-AC composite. To achieve the objectives, combined oxides/hydroxides of Al and Ce were impregnated within the pore spaces of AC under varying pH, metal concentration, and synthesis temperature. The fluoride removal by different composite was evaluated, and the best performing composite was selected for equilibrium sorption experiments and kinetic tests. The effect of pH on fluoride removal was assessed. Overall it was observed that impregnation of a small amount of metal (0.05 mol/L Al-Ce) can enhance the fluoride removal efficiency, compared to unmodified AC. Sorption of the best performing composite follows the Freundlich isotherm model. The maximum fluoride sorption capacity was estimated as 3.05 mg F−/g of composite. The rate of sorption by the selected composite is reasonably fast (3.6/h). Furthermore, within a wide range of pH (5–10), removal of fluoride was observed to be consistent.

scholarly journals Utilization of Charred Water Hyacinth (Jalkumvi) as Biosorbent for Removal of Ca(II) Ion from Aqueous Solution

2021 ◽  
Vol 42 (1) ◽  
pp. 107-114
Author(s):  
Arun Bhujel ◽  
Krishna Wagle ◽  
Bishow Regmi ◽  
Bibek Sapkota ◽  
Bhoj Raj Poudel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Water Hyacinth ◽  
Chemical Activation ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorbent Surface ◽  
Sem Micrograph ◽  
Pseudo Second Order ◽  
Efficient Alternative

A promising adsorbent, charred water hyacinth (CWH) for the removal of Ca(II) from the aqueous solution was explored by heat treatment of water hyacinth followed by chemical activation with acidified zinc chloride (ZnCl2). The adsorbent was characterized using scanning electron microscopy (SEM) and electron dispersive X-ray (EDX) spectroscopy. Batch adsorption techniques were conducted for Ca(II) adsorption to assess the adsorption isotherm, effect of pH, contact time, initial Ca(II) concentration, adsorbent doses, and adsorption kinetics. The SEM micrograph illustrates the rough and irregular surface morphology and EDX spectra confirm the successful adsorption of Ca(II) on the adsorbent surface. The equilibrium adsorption data better fitted to the Freundlich isotherm model having a maximum adsorption capacity (qmax) of 319.75 mg/g. The highest percentage of adsorption was found at pH 1.5. The adsorption of Ca(II) by CWH decreased at the higher metal concentration and lower adsorbent doses. The adsorption of Ca(II) ions onto CWH followed the pseudo-second-order kinetics model. . Overall, these results suggested that the as-prepared CWH can be used as an eco-friendly, economical and efficient alternative for the removal of Ca(II)  from the aqueous solution.

scholarly journals Adsorptive Removal of Anionic Azo Dye Acid Black 194 from Aqueous Solution using NNMBA-Crosslinked Poly N-Vinyl Pyrrolidone Hydrogel

2019 ◽  
Vol 32 (2) ◽  
pp. 311-316
Author(s):  
Rino Laly Jose ◽  
M.G. Gigimol ◽  
Beena Mathew
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Vinyl Pyrrolidone ◽  
Batch Adsorption ◽  
Freundlich Isotherms ◽  
Physico Chemical ◽  
Before And After ◽  
Pseudo Second Order

N,N-Methylene bis-acrylamide crosslinked poly-N-vinyl pyrrolidone hydrogels were synthesized and binding of the hydrogel with the dye solution was followed spectrophotometrically. The chemical structure and morphology of the hydrogel before and after adsorption of acid black 194 was confirmed by FT-IR and SEM. Effect of various physico-chemical parameters such as concentration, temperature, pH, time and the amount of hydrogel used were investigated by batch adsorption studies. Hydrogel used as adsorbent in this study was characterized by UV-Vis spectrophotometer before and after adsorption of acid black 194. Kinetic studies suggested pseudo second order reaction. Langmuir and Freundlich isotherms were applied on equilibrium adsorption data and found that Freundlich isotherm fit better for the present investigation. N,N-methylene bisacrylamide crosslinked poly-N-vinyl pyrrolidone hydrogel displayed excellent properties for the removal of the azo dye, acid black 194 from aqueous solution.

scholarly journals Removal of Cd (II) ions from Aqueous Solution by Adsorption on Activated Carbon Prepared from Lapsi (Choerospondias axillaris) Seed Stone

2016 ◽  
Vol 11 (1) ◽  
pp. 140-150 ◽  
Author(s):  
Rajeshwar Man Shrestha
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Metal Ion ◽  
Activated Carbons ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Equilibrium Data ◽  
Methylene Blue Number

Batch adsorption experiments were conducted for the adsorption of Cd (II) ions from aqueous solution by activated carbon prepared from Lapsi seed stone. The activated carbon was characterized by Iodine number, Methylene blue number, SEM and FTIR. Adsorption experiments were carried out to describe the effect of pH ,contact time and  adsorbent dose on the metal ion removal process .The results showed that the adsorption of Cd (II) ions was very fast initially and the equilibrium time was 3 hrs.The pH of 6.0 was an optimal pH for adsorption  of Cd(II) ions. Langmuir and Freundlich adsorption isotherms were used to explain the equilibrium data. Langmuir model best described the data with higher value of coeffcient of determination as −1 compared to that of Freundlich isotherm showing a maximum uptake of 37.0 mgg . This study demonstrated that the activated carbons prepared from Lapsi seed stone could be used for the removal of Cd (II) ions in water treatment. Journal of the Institute of Engineering, 2015, 11(1): 140-150

Adsorption of methylene blue and Congo red from aqueous solution by activated carbon and carbon nanotubes

2013 ◽  
Vol 68 (10) ◽  
pp. 2240-2248 ◽  
Author(s):  
M. Szlachta ◽  
P. Wójtowicz
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Congo Red ◽  
Solution Temperature ◽  
Adsorptive Capacity ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of

This study was conducted to determine the adsorption removal of dyes by powdered activated carbon (PAC, Norit) and multi-walled carbon nanotubes (MWCNTs, Chinese Academy of Science) from an aqueous solution. Methylene blue (MB) and Congo red (CR) were selected as model compounds. The adsorbents tested have a high surface area (PAC 835 m2/g, MWCNTs 358 m2/g) and a well-developed porous structure which enabled the effective treatment of dye-contaminated waters and wastewaters. To evaluate the capacity of PAC and MWCNTs to adsorb dyes, a series of batch adsorption experiments was performed. Both adsorbents exhibited a high adsorptive capacity for MB and CR, and equilibrium data fitted well with the Langmuir model, with the maximum adsorption capacity up to 400 mg/g for MB and 500 mg/g for CR. The separation factor, RL, revealed the favorable nature of the adsorption process under experimental conditions. The kinetics of adsorption was studied at various initial dye concentrations and solution temperatures. The pseudo-second-order model was used for determining the adsorption kinetics of MB and CR. The data obtained show that adsorption of both dyes was rapid in the initial stage and followed by slower processing to reach the plateau. The uptake of dyes increased with contact time, irrespective of their initial concentration and solution temperature. However, changes in the solution temperature did not significantly influence dye removal.

scholarly journals In situ synthesis of layered double hydroxides on γ-Al2O3 and its application in chromium(VI) removal

2017 ◽  
Vol 75 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
Shifeng Li ◽  
Fang Qi ◽  
Min Xiao ◽  
Hongtao Fan ◽  
Yanming Shen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxides ◽  
Adsorptive Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Chromium Vi ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxides

Mg-Al layered double hydroxides (LDHs) adsorbent was synthesized in situ on γ-Al2O3 for the removal of Cr(VI) from aqueous solution. The material was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electronic microscopy and thermogravimetry and differential thermal analysis. Compared to the LDHs powder, the calcined LDHs sorbent prepared in situ on γ-Al2O3 had higher specific surface area and was easy to recover and reuse. The adsorptive capacity for removing Cr(VI) from aqueous solution was resulting from the memory effect of LDHs based on the XRD results. Both the pseudo-second-order kinetic model and the Langmuir model fit the experimental data well. Furthermore, the adsorbent exhibits excellent sorption–regeneration performances.

Removal of 4-nitrophenol from aqueous solution by adsorption onto activated carbon prepared from Acacia glauca sawdust

2015 ◽  
Vol 73 (4) ◽  
pp. 955-966 ◽  
Author(s):  
Prashant T. Dhorabe ◽  
Dilip H. Lataye ◽  
Ramakant S. Ingole
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Enthalpy Change ◽  
Optimum Dose ◽  
Batch Adsorption ◽  
Gibbs Free Energy Change ◽  
Pseudo Second Order ◽  
Percentage Removal ◽  
Maximum Removal

The present paper deals with a complete batch adsorption study of 4-nitrophenol (4NP) from aqueous solution onto activated carbon prepared from Acacia glauca sawdust (AGAC). The surface area of the adsorbent determined by methylene blue method is found to be 311.20 m2/g. The optimum dose of adsorbent was found to be 2 g/l with 4NP uptake of 25.93 mg/g. The equilibrium time was found to be 30 minutes with the percentage removal of 96.40 at the initial concentration of 50 ppm. The maximum removal of 98.94% was found to be at pH of 6. The equilibrium and kinetic study revealed that the Radke–Prausnitz isotherm and pseudo second order kinetics model fitted the respective data well. In the thermodynamic study, the negative value of Gibbs free energy change (−26.38 kJ/mol at 30°C) and enthalpy change (−6.12 kJ/mol) showed the spontaneous and exothermic nature of the adsorption process.

scholarly journals Equilibrium and Kinetic Study of Removal Copper(II) from Aqueous Solution Using Chicken Eggshells: Low Cost Sorbent

Molekul ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 28
Author(s):  
Mohammad Jihad Madiabu ◽  
Joko Untung ◽  
Imas Solihat ◽  
Andi Muhammad Ichzan
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Sorption Process ◽  
X Ray Diffraction ◽  
Order Model ◽  
X Ray ◽  
Adsorption Condition ◽  
Pseudo Second Order ◽  
Effect Of Copper

The research aims to investigate feasibility eggshells as potential adsorbent to remove copper(II) ions from aqueous solution. Eggshells powder was characterized using X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. Effect of copper(II) initial concentration, adsorbent dosage, and contact time have conducted. The optimum adsorption condition obtained when 0.7 g eggshells applied to 50 mg/L copper(II) solution for 50 minutes. The maximum percentage of copper(II) removal was exceeded more than 85%. Langmuir and Freundlich isotherm model were applied to describe the equilibrium adsorption. Copper(II) kinetics sorption process was fitted to pseudo-second order model with a rate constant equal to 0.516 g/mg.min. The results clearly exhibit that eggshells powder can be effectively used to remove copper(II) ions from aqueous solutions.

scholarly journals EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDIES OF ADSORPTION OF METHYLENE BLUE ON ACTIVATED CARBON FROM COCOA POD SHELLS

2021 ◽  
Vol 9 (11) ◽  
pp. 62-72
Author(s):  
Akissi Lydie Chantal Koffi ◽  
◽  
Djamatche Paul Valery Akesse ◽  
Herman Yapi Yapo ◽  
David Leonce Kouadio ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Physiochemical Parameters ◽  
Batch Tests ◽  
Pseudo Second Order

The aim of this research is to investigate the feasibility of using activated carbon from cocoa pod shells, waste from agriculture to adsorb methylene blue from aqueous solutions through batch tests. Various physiochemical parameters such as, contact time, initial dye concentration, adsorbent dosage, pH of dye solution and temperature were investigated in a batch-adsorption technique. The process followed the pseudo-second order kinetics model which showed chemical adsorption. Langmuir and Freundlich isotherm models were used to determine adsorption constants. The maximum adsorption capacity at 30°C is 526.31 mg/g. Thermodynamic parameters such as enthalpy change (∆Hº), free energy change (∆Gº) and entropy change (∆Sº) were studied, and the adsorption process of BM was found to be exothermic and spontaneous.

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