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.

Performance evaluation of metal impregnated activated carbon composite for removal of fluoride under varying solution chemistry

2017 ◽  
Vol 17 (5) ◽  
pp. 1377-1385 ◽  
Author(s):  
Trishikhi Raychoudhury ◽  
Sriman Pankaj Boindala ◽  
Shreeya Kalidindi
Keyword(s):  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Carbon Composite ◽  
Solution Chemistry ◽  
Fluoride Removal ◽  
Sorption Behavior ◽  
Equilibrium Sorption ◽  
Synthesis Conditions ◽  
Maximum Sorption Capacity ◽  
Wide Range

The objectives of this study are to optimize the synthesis conditions of metals such as aluminum (Al), iron (Fe) and cerium (Ce) impregnated activated carbon composites (AC-M) for fluoride removal and to evaluate the sorption behavior of fluoride by the composite under varying solution chemistry. To achieve the objectives, several composites were prepared with different combinations of Al, Ce and Fe at different temperatures. The fluoride removal by different composites was evaluated, and the best performing composite was selected for further study. Equilibrium sorption experiments and kinetic tests were carried out. The effect of pH and the presence of different co-ions on the removal of fluoride were assessed. Based on the performances, the composites can be ranked as AC-Ce > AC-AlCe > AC-CeFe > AC-AlCeFe > AC-AlFe. The maximum sorption capacity by the AC-Ce composites is in the range of 4.1–4.6 mg/g. The equilibrium sorption follows the Freundlich isotherm model whereas the kinetics is better explained by a pseudo-second-order kinetics model (0.018–0.029 g/mg/min). The presence of bicarbonate and phosphate has a significant effect on fluoride removal efficiency. The novel AC-Ce composites have a strong buffering effect under a wide range of pH, which can make it suitable for treating drinking water.

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.

Adsorptive Removal of Ni2+ from Aqueous Solution Using Rice Husk-Based Activated Carbon

2015 ◽  
Vol 754-755 ◽  
pp. 950-954
Author(s):  
Mohd Faisal Taha ◽  
Anis Suhaila Shuib ◽  
Maizatul Shima Shaharun ◽  
Azry Borhan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Rice Husk ◽  
Textural Properties ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Adsorption Studies ◽  
Adsorptive Removal ◽  
Equilibrium Data ◽  
Good Potential

An attempt was made to study the potential of rice husk as an alternative cheap precursor for activated carbon to remove Ni2+ from aqueous solution. Rice husk was treated chemically (with NaOH) and physically (carbonization) to prepare rice husk based activated carbon (RHAC). The textural properties of RHAC, i.e. surface area (255 m2/g) and pore volume (0.17 cm2/g), were determined by N2 adsorption using Brunauer-Emmett-Teller (BET) surface analyzer. RHAC was also characterized for its morphology and its elemental compositions. The adsorption studies for the removal of Ni2+ from aqueous solution were carried out using different dosage of RHAC as adsorbent as a function of varied contact time. The concentration of Ni2+ was determined by atomic absorption spectrometer (AAS). The results obtained from adsorption studies indicate good potential of rice husk as a cheap precursor to produce activated carbon for the removal of Ni2+ from aqueous solution. The equilibrium data from adsorption studies fitted well the of Langmuir and Freundlich isotherm models.

Study on Treatment of Cr (VI)-Containing Wastewater with Nitric Acid Modified Activated Carbon

2011 ◽  
Vol 413 ◽  
pp. 38-41
Author(s):  
Xiu Ling Song ◽  
Hui Qian
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Exchange Capacity ◽  
Modified Activated Carbon ◽  
Exchange Adsorption ◽  
Adsorption Curve

After activated carbon is oxidized and modified with nitric acid (1:1), its cation exchange capacity can amount to 1.840 mmol • g-1. The modified activated carbon is used as adsorbent for the treatment of Cr (Ⅵ)-containing wastewater at room temperature, and its removal mechanism is discussed in this paper. It is shown that: when the pH value of the aqueous solution being 2.5-3.0;the adsorption time being 3.0h, the removal rate of Cr (Ⅵ) in the aqueous solution can reach 97% and its adsorption capacity can amount to 45.66 mg • g-1. From the results, it can be also seen that the adsorption curve to chromium in wastewater by the modified activated carbon better meets the Freundlich isotherm, and ion exchange adsorption mainly does its work.

scholarly journals Application of Freundlich and Temkin Isotherm to Study the Removal of Pb(II) Via Adsorption on Activated Carbon Equipped Polysulfone Membrane

2018 ◽  
Vol 7 (3.18) ◽  
pp. 91 ◽  
Author(s):  
Khairul Anwar Mohamad Said ◽  
Nor Zakirah Ismail ◽  
Ramizah Liyana Jama'in ◽  
Nurul Ain Mohamed Alipah ◽  
Norsuzailina Mohamed Sutan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Void Formation ◽  
Freundlich Isotherm ◽  
Polysulfone Membrane ◽  
Temkin Isotherm ◽  
The Matrix

The aim of this study was to investigate the application of membrane equipped activated carbon for heavy metal removal. An adsorption capacity of the activated carbon inside membrane matrix was performed against environmentally problematic ions specifically Pb2+, in aqueous solution. The adsorption process was examined by Temkin and Freundlich isotherm. From the SEM observation, membrane exhibit sponge-like structure with dense micro-void formation across the matrix. This phenomenon was usually observed with membrane mixed with polyethyleneimine. For the adsorption studies, it is shown that Freundlich isotherm show better fit based on R2 value of 0.9893 with Temkin isotherm fitted with R2 of 0.9009. Through the fitted model, the adsorption occur on the surface of activated carbon are possibly multilayer type adsorption based on theory by Freundlich isotherm and fall under non-ideal reversible adsorption.  

scholarly journals Kinetic, Equilibrium and Thermodynamic Studies on Removal of Cu(II) and Pb(II) by Activated Carbon Prepared from Macro-Algae (Kappaphycus alvarezii)

2019 ◽  
Vol 31 (6) ◽  
pp. 1343-1348
Author(s):  
K.V. SATHASIVAM ◽  
N.K. FULORIA ◽  
S. FULORIA ◽  
P.J. DARSHENEE ◽  
R. XAVIER ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Contact Time ◽  
Kappaphycus Alvarezii ◽  
Chemical Activation ◽  
Freundlich Isotherm ◽  
Experimental Parameters ◽  
Equilibrium Data ◽  
Kinetic Equilibrium ◽  
Macro Algae

Present study was intended to explore the biosorption of Cu(II) and Pb(II) ions in aqueous solution using activated carbon biosynthesized from macro-algae Kappaphycus alvarezii under different experimental parameters. Activated carbon was produced via zinc chloride chemical activation method. The effect of parameters such as pH, temperature over biosorption, amount of adsorbents, initial Cu(II) and Pb(II) aqueous concentration, and contact time were studies. The pH 4.0 for adsorption of Cu(II) and Pb(II), and metal ions uptake contact time of 60 min were considered as optimum. Equilibrium data of biosorption were analyzed by models of Langmuir and Freundlich isotherm at different initial Cu(II) and Pb(II) aqueous solutions concentration. Fruendlich adsorption isotherm model fitted well into biosorption data with a regression value of 0.9986. Thermodynamic parameters such as change in change of enthalpy (ΔHº), change of entropy (ΔSº) and Gibbs free energy (ΔGº) were also determined.

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

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