scholarly journals Preparation of Activated Charcoal Adsorbent from Waste Tire

2012 ◽  
Vol 27 ◽  
pp. 19-25 ◽  
Author(s):  
Vinay Kumar Jha ◽  
Kiran Subedi
Keyword(s):  
Methylene Blue ◽  
Rate Constant ◽  
Activated Charcoal ◽  
Langmuir Model ◽  
Water Steam ◽  
Kinetics Of Adsorption ◽  
Waste Tire ◽  
Pseudo Second Order ◽  
Mathematical Equations ◽  
Kinetics Of

Activated charcoal was prepared from waste tire by using pyrolysis technique in three different atmospheres, viz, air, nitrogen and a combined atmosphere of nitrogen and water (steam). Methylene blue was then adsorbed on to these activated charcoals and the kinetics of adsorption was also studied. The adsorption isotherms of methylene blue were simulated by the mathematical equations of Langmuir and Freundlich. The Langmuir isotherms were found to have better fitting than that of Freundlich. The Qmax values obtained from Langmuir model were 0.032, 0.036, and 0.092 mmol/g for the activated charcoals prepared in air, nitrogen and nitrogen and water (steam), respectively. The overall reaction was found to be pseudo-second order with the rate constant of 4.2 × 10-2 L g/(mmolmin). The equilibrium adsorption value obtained from the kinetics data i.e. 0.072 (mmol/g) was found to be comparable with that obtained from Langmuir model.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6437 J. Nepal Chem. Soc., Vol. 27, 2011 19-25Uploaded date: 16 July, 2012

scholarly journals Ecologically friendly chitosan-montmorillonite bio-nanocomposite as adsorbent for textile dyes from aqueous solutions

2017 ◽  
Vol 49 (4) ◽  
pp. 419-429
Author(s):  
Natasa Jovic-Jovicic ◽  
Predrag Bankovic ◽  
Zorica Mojovic ◽  
Bojana Nedic-Vasiljevic ◽  
Sanja Marinovic ◽  
...  
Keyword(s):  
Textile Dyes ◽  
Langmuir Model ◽  
Reactive Black 5 ◽  
Freundlich Model ◽  
Kinetics Of Adsorption ◽  
Order Of Kinetics ◽  
Pseudo Second Order ◽  
Ir Analysis ◽  
Acid Orange 10 ◽  
Kinetics Of

The bio-nanocomposite of montmorillonite and natural biopolymer chitosan (C-MM) was synthesized. Intercalation of chitosan in form of monolayer into the interlamellar space of montmorillonite was confirmed by XRD and IR analysis. The adsorption of textile dyes: Acid Yellow 99 (AY99), Acid Orange 10 (AO10) and Reactive Black 5 (RB5) onto C-MM was investigated. The adsorption was performed with the respect to adsorption time, pH and initial dye concentration. The kinetics of adsorption obeyed pseudo-second-order of kinetics and was the most efficient in acidic pH. Langmuir model best described the adsorption of AY99 and AO10 , while RB5 adsorption isotherm was best fitted with Freundlich model.

scholarly journals Preparation of activated charcoal adsorbent from waste tire

2012 ◽  
Vol 10 (10) ◽  
pp. 80-83 ◽  
Author(s):  
Drona Raj Barai ◽  
Vinay Kumar Jha
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Activated Charcoal ◽  
Activated Carbons ◽  
Freundlich Isotherms ◽  
Waste Tire ◽  
Scientific World ◽  
Langmuir And Freundlich Isotherms ◽  
Pseudo Second Order

Activated carbons were prepared from waste tire in two different routes. Some physical properties of thus prepared activated carbons were measured and the characterization of their phases was done by XRD measurement. The adsorption isotherms of methylene blue were simulated by the Langmuir and Freundlich isotherms. The Langmuir isotherms were found to have better fitting with Qmax values 0.227, 0.255 and 0.256 mmol/g for the activated carbons prepared in air, nitrogen, nitrogen and steam respectively while it was 0.275 mmol/g for activated carbon impregnated with H3 PO4 . The overall reaction was found to be pseudo-second order with the rate constant of 8.314 × 10-4 Lg/(mmolmin). The surface area of the best prepared activated carbon was 334.2 m2 /g. Scientific World, Vol. 10, No. 10, July 2012 p80-83 DOI: http://dx.doi.org/10.3126/sw.v10i10.6868

Sodium Alginate-Cellulose-Nano-Clay Composite Adsorbent Applied for Lead Removal from Wastewater

2001 ◽  
Vol 71 (3) ◽  
pp. 416-424
Author(s):  
Ecaterina Matei ◽  
Maria Rapa ◽  
Cristina Ileana Covaliu ◽  
Andra Mihaela Predescu ◽  
Andreea Turcanu ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Langmuir Model ◽  
Lead Removal ◽  
Composite Adsorbent ◽  
Kinetics Of Adsorption ◽  
Adsorption Time ◽  
Nano Clay ◽  
Pseudo Second Order ◽  
Prepared Composite ◽  
Kinetics Of

A sodium alginate/cellulose/n-clay composite was prepared as potential adsorbent for removal of Pb(II) from wastewater. The results showed that obtained adsorbent used for 4 mg L-1 initial concentration of Pb(II) in wastewater after 90 min adsorption time led to 90% removal efficiency and the adsorption capacity of the prepared composite was 0.11 mg .g-1. The isotherms and kinetics of adsorption revealed that the equilibrium adsorption and kinetics were well-described by the Langmuir model and pseudo-second-order kinetics, respectively.

scholarly journals Study of the adsorption capacity of Fe(II) dissolved in water by using a mineral rich in Manganese Dioxide (MnO2) from Colombia

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 223-228 ◽  
Author(s):  
Jhonnathan Machado-Infante ◽  
Gustavo Ramírez-Caballero ◽  
Martha Juliana Barajas Meneses
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Water Treatment ◽  
Adsorption Capacity ◽  
Open Systems ◽  
Kinetics Of Adsorption ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Potential Alternative ◽  
Kinetics Of

<p>In Colombia, a mineral rich in MnO<sub>2</sub> is extracted from the mines of Mallama, Nariño. In this work we studied the adsorption capacity of this mineral for Fe(II) dissolved in aqueous solution of open systems. The characterization was done through ICP-AES, XRF and Raman spectroscopy. The effect of different pretreatments on the mineral with oxidizing agents such as KMnO<sub>4</sub> and NaClO was evaluated. Studies of equilibrium and kinetics of adsorption showed that the mechanism fits well to the Langmuir isotherm and its kinetics to a model of pseudo-second order. At the conditions studied was found that the adsorption capacity for the mineral modified with KMnO<sub>4</sub> and NaOCl were 59.209 and 51.279 mg/g respectively. It is concluded that the mineral is a potential alternative in water treatment.</p>

scholarly journals KINETIC STUDY ON ADSORPTION OF CHROMIUM(lIl) TO DIATOMACEOUS EARTH PRE-TREATED WITH SULFURIC AND HYDROCHLORIC ACIDS

2010 ◽  
Vol 3 (1) ◽  
pp. 32-38
Author(s):  
Nuryono Nuryono ◽  
V.V.H. Susanti ◽  
Narsito Narsito
Keyword(s):  
Rate Constant ◽  
Adsorption Kinetics ◽  
Diatomaceous Earth ◽  
Atomic Absorption Spectrophotometry ◽  
Adsorption Rate ◽  
Physical Interaction ◽  
Kinetics Of Adsorption ◽  
Pre Treatment ◽  
Sulfuric And Hydrochloric Acids ◽  
Kinetics Of

In this research, the effect of Sangiran diatomaceous earth pre-treatment with sulfuric acid (H2SO4) and hydrochloric acid (HCl) on the kinetics of adsorption for Cr(III) in aqueous solution has been studied. The research has been carried out by mixing an amount of diatomeaeous earth with HCl or H2SO4 in various concentrations for two hours at temperature of 150 - 200°C. The mixture was washed with water until neutral, and the residue was dried at 70°C for four hours. The result then was used as adsorbent. Adsorption was carried out by mixing an amount of adsorbent with Cr(III) solution in various contact times. Ion adsorbed was determined by analyzing filtrate using atomic absorption spectrophotometry. The effect of pre-treatment on adsorption kinetics was evaluated based on kinetic parameters, i.e. constant of adsorption rate by using Langmuir-Hinshelwood kinetics and using two-process kinetics (fast and slow processes). Adsorption kinetics calculated using LH equation gave negative value for adsorption rate constant of zero order (k0). On the other words, the LH kinetics might not be applied for adsorption of Cr(III) to diatomaceous earth adsorbent. Results of kinetics study approached using two processes (fast and slow) showed that adsorption of Cr(III) occurred in two processes with rate constant of fast adsorption, kc, 0.041/min, rate constant of slow adsorption, kl, 0.0089/min, and of slow desorption, k'l, 0.089/menit. Pre-treatment with HCl up to 10 M decreased either kc, kl or k'l, while pre-treatment with H2SO4 1M increased kc to 0.061/min, decreased kl to 0.00424 and k'l to 0.0139/min. On pre-treatment with H2SO4 higher than 6 M significantly decreased three constants above. Based on the Gibbs energy change (4.31 - 6.79 kJ/mole) showed that adsorption involved physical interaction.   Keywords: adsorption, chromium, diatomaceous earth, kinetics, Langmuir-Hinshelwood

scholarly journals The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 681 ◽  
Author(s):  
Fabian Arias Arias ◽  
Marco Guevara ◽  
Talia Tene ◽  
Paola Angamarca ◽  
Raul Molina ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Maximum Adsorption Capacity ◽  
Green Protocol ◽  
Reduced Graphene ◽  
Wastewater Systems ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Potential Use

Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π − π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems.

Study on the Kinetics of Adsorption of Cadmium by Chitosan

2010 ◽  
Vol 160-162 ◽  
pp. 1804-1809
Author(s):  
Qiang Bi ◽  
Juan Qin Xue ◽  
Ying Juan Guo ◽  
Yu Jie Wang ◽  
Yun Feng Xue
Keyword(s):  
Kinetic Equations ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Ph Values ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Isotherm Equations ◽  
Kinetics Of

The adsorption of cadmium in simulated wastewater by chitosan was investigated. The influence of temperature, contact time and pH on adsorption efficiency of cadmium was examined. Some related mathematical models were used in the fitting of experimental data. The results showed that at room temperature, the optimum pH of adsorption is between 4 and 7. At lower pH values, a strong competition existed between cadmium ions and protons for sorption sites and the sorption efficiency was decreased. After 60 minutes the adsorption equilibrium can be achieved. Chitosan is very effective at removing cadmium with the maximum adsorption capacity is 112.05mg•g-1. The adsorption kinetic curves agree with the pseudo-second-order adsorption kinetic equations and the adsorption isotherms could be well described by Langmuir isotherm equations.

Application of the intra-particle diffusion model for activated carbon fibers in an aqueous medium

2012 ◽  
Vol 1373 ◽  
Author(s):  
Teresa Ramírez-Rodríguez ◽  
Fray de Landa Castillo-Alvarado
Keyword(s):  
Activated Carbon ◽  
Diffusion Model ◽  
Carbon Fibers ◽  
Aqueous Media ◽  
Particle Diffusion ◽  
Activated Carbon Fibers ◽  
Kinetics Of Adsorption ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Kinetics Of

ABSTRACTThe intra-particle diffusion model (IPD), proposed by Weber and Morris has been applied to the analysis of the kinetics of adsorption on activated carbon fibers with phosphate groups in the removal of cadmium ions in aqueous media. It is evident that the removal of cadmium ion kinetic model of pseudo-second order provides a better fit than the model of pseudo-first order and the intra-particle diffusion model provides the best to the sample compared activating solution: grams fibers of 1:3.

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