scholarly journals A STUDY OF THE REMOVE CATIONIC AND ANIONIC DYES IN AQUEOUS SOLUTION BY A NEW NATURAL CLAY

2020 ◽  
Vol 5 (10) ◽  
pp. 64-74
Author(s):  
Malika Tamimi ◽  
Nadia Bougdour ◽  
Said Alahaine ◽  
Asma Sennaoui ◽  
Ali Assabbane
Keyword(s):  
Contact Time ◽  
Removal Rate ◽  
Natural Clay ◽  
Reaction Parameter ◽  
Reaction Parameters ◽  
Anionic Dyes ◽  
Good Efficiency ◽  
Kinetics Of Adsorption ◽  
Kinetics Of ◽  
Maximum Removal

The objective of this work is to study the possibility of eliminating both dyes Methylene Blue (MB) and Congo Red (CR) by adsorption on natural clay of the region of Agadir and determine the different reaction parameters effect on the proceeds. Orientation tests have been carried out in distilled water solutions. The results of the kinetics of adsorption showed that optimal contact time is 60 min; it corresponds to a maximum removal rate of MB and CR respectively of the order of 99% and 75%. Increased adsorbent ratio (0,1 à 2 g / l) improves the removal efficiency of the CR especially dyes for an initial concentration of 10 mg/l. NaNO3 salt and pH of the medium greatly influence the CR of retention. Whatever the reaction parameter tested; it appears that the clay has a good efficiency for the retention of two dyes.

scholarly journals Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

2017 ◽  
Vol 13 (27) ◽  
pp. 425
Author(s):  
Azeh Yakubu ◽  
Gabriel Ademola Olatunji ◽  
Folahan Amoo Adekola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

Adsorption Characters of Mn2+ onto Palygorskites Modified by 1, 10-Phenanthroline and Triethylamine

2010 ◽  
Vol 178 ◽  
pp. 8-16
Author(s):  
Liang Dong Feng ◽  
Bo Qing Chen ◽  
Ying Ying Shi ◽  
Ying Wei Guo ◽  
Jing Huang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Ph Value ◽  
Order Model ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

1, 10-phenanthroline and triethylamine modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR technique. The effects of contact time, adsorbent dosage, and pH value of the initial solution on the adsorption characters of Mn2+ were investigated. The adsorption of Mn2+ from aqueous solutions using 1, 10-phenanthroline or triethylamine modified palygorskites were investigated. Experiment results indicated that 1,10-phenanthroline and triethylamine molecules have been successfully grafted to palygorskite. The adsorption was rapid during the first 5 minuts and equilibrium were attained within 60 minutes in the initial concentration of Mn2+ of 50 and 100 mg•L-1, and fast adsorption in the first 10 minutes and slowly increased with the contact time due to the adsorption of palygorskite. The 1, 10-phenanthroline modified palygorskites had higher adsorption capacity than triethylamine modified palygorskites. Compared with natural palggorskites, the Mn2+ ions adsorption capacities of palggorskite modified by 1, 10-phenanthroline or triethylamine were significantly improved. There were less difference in the adsorption capacity between different dasages of 1, 10-phenanthroline modified palygorskites, but the adsorption capacity of Mn2+ adsorbed onto triethylamine modified palygorskites decreased with increasing the dosages. A Lagergren pseudo-second order model best described the kinetics of adsorption of Mn2+ onto the modified palygorskites.

scholarly journals Adsorption of Ca(II), Mg(II), Zn(II), and Cd(II) on Chitosan Membrane Blended with Rice Hull Ash Silica and Polyethylene Glycol

2018 ◽  
Vol 16 (1) ◽  
pp. 45 ◽  
Author(s):  
F. Widhi Mahatmanti ◽  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Polyethylene Glycol ◽  
Contact Time ◽  
Metal Ion ◽  
Ion Concentration ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Kinetics Of Adsorption ◽  
Metal Ion Adsorption ◽  
Pseudo Second Order ◽  
Kinetics Of

In this research, chitosan based membrane blended with rice hull ash (RHA) silica and polyethylene glycol (PEG) has been applied as adsorbent of Ca(II), Mg(II), Zn(II) and Cd(II) in an aqueous solution. Membrane was synthesized by blending RHA silica and polyethylene glycol into chitosan. Silica and polyethylene glycol blended into the chitosan to improve the mechanical properties and the membrane porous. The membrane was characterized using Fourier Transform infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and swelling degree analyzer. Adsorption of metal ions investigated was conducted in a batch system with variation of pH, initial ion concentration and contact time. Thermodynamics and kinetics of adsorption were evaluated based on the adsorption data at initial metal ion concentration and contact time variations, respectively. Results showed that the optimum condition of adsorption was at pH 9.0 for Ca(II), 6.0 for both Mg(II) and Zn(II) and 5.5 for Cd(II), and contact time of 24 h for all ions investigated. Kinetics of all investigated metal ion adsorption followed a kinetic model of pseudo-second-order. Adsorption of Ca(II) and Mg(II) on the membrane fitted to Freundlich model with the affinity of 1.266 and 1.099, respectively; and Zn(II) and Cd(II) fitted to Langmuir one with the capacity of 182 and 106 µmol/g, respectively.

scholarly journals Adsorption study of Congo Red Dye with ZSM-5 directly synthesized from bangka kaolin withouth organic template

2017 ◽  
Vol 13 (4) ◽  
pp. 832-839 ◽  
Author(s):  
Ani Iryani ◽  
Moh Mualliful Ilmi ◽  
Djoko Hartanto
Keyword(s):  
Congo Red ◽  
Contact Time ◽  
Organic Template ◽  
Adsorption Models ◽  
Kinetics Of Adsorption ◽  
Adsorption Study ◽  
Isotherm Adsorption ◽  
Capacity Data ◽  
Red Dye ◽  
Kinetics Of

ZSM-5’s adsorption study of kaolin Bangka without organic template using congo red with initial concentration of 50-250 mg / L with variation of contact time of 40-180 minutes. The results of the adsorption of Congo Red (CR) dye at 30oC-50oC with pH 7, the increase in contact time causes the dye to decrease significantly. In addition, an increase in adsorption rate at first step then slows down as it approaches to the equilibrium point. The experimental results using each temperature variation, showing the equilibrium time of the adsorption process at contact time of 100 minutes. Four isotherm adsorption models were used to analyze and measure the results of experimental data adsorption. The ZSM-5 adsorption capacity of Bangka kaolin is exhibited for the reds of Congo isotherm adsorption. The results of isotherm adsorption studies on three temperatures showed the fitting into Langmuir isotherms adsorption type which means the adsroption occured physically monolayer, the kinetics of adsorption clearly follows the first-pseudo-order reaction kinetics with higher R2 closes to 1. The adsorption thermodynamics analysis show that the adsorption chategorized as exthormic reaction (negative value of ), this conclusion is supported by adsortion capacity data in 180 min contact times which demostrate that the increasing adorption temperature decreasing amount adsorbate being adsorbed. The  (Gibb’s Energy) of adsorption are negative in several temperature which demonstrates that the adsroption are spontanously occured in ech temperature. The adsorption study can be used as a reference for ZSM-5 adsorption optimization.

Adsorption of Sn (II) from Aqueous Solutions on Expanded Graphite

2011 ◽  
Vol 347-353 ◽  
pp. 89-93
Author(s):  
Ming Yang ◽  
Ying Hua Zhao ◽  
Ying Chen Zhang ◽  
Deng Xin Li
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Removal Rate ◽  
Expanded Graphite ◽  
Adsorption Behavior ◽  
Adsorption Quantity ◽  
Maximum Removal

Expanded graphite (EG) was prepared by microwave irradiation at 1000 w for 60 s. It is a novel adsorbent for Sn (Ⅱ) adsorption. This paper aims to investigate the effect of the adsorption of EG. The adsorption behavior of Sn (Ⅱ) from aqueous solution onto EG was investigated with variety of parameters such as pH, adsorbents dosage, initial Sn (Ⅱ) concentration, contact time and temperature. On conditions that the pH was 2.5, the dosage of adsorbent was 0.02 g, the concentration of Sn (Ⅱ) was 200 mg/L and the temperature was 15°C, the maximum removal rate can reach to 98.32%, and the adsorption quantity can reach to 245.7985 mg•g-1. The results showed that the EG was an efficient and novel adsorbent for the removal of stannum from aqueous solution.

scholarly journals Batch study, equilibrium and kinetics of adsorption of naphthalene using waste tyre rubber granules

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Felix A. Aisien ◽  
Andrew N. Amenaghawon ◽  
Albert I. Adinkwuye
Keyword(s):  
Contact Time ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Kinetics Of Adsorption ◽  
Isotherm Equation ◽  
Operational Variables ◽  
Langmuir Isotherm Equation ◽  
Equilibrium And Kinetics ◽  
Waste Tyre ◽  
Kinetics Of

The potential use of waste tyre rubber granules (WTRG) for the batch adsorption of naphthalene from aqueous solutions was investigated. The effect of various operational variables such as contact time, initial naphthalene concentration, adsorbent dose, size of adsorbent particles, and temperature of solution on the adsorption capacity of WTRG was evaluated. The adsorption of naphthalene by WTRG was a fast kinetic process with an equilibrium contact time of 60 min. A low temperature (5°C), small adsorbent particle size (0.212 mm) and higher adsorbent dosage favored the adsorption process. Results of isotherm studies revealed that adsorption of naphthalene was best described by the Langmuir isotherm equation (R<sup>2</sup>=0.997) while the kinetics of the process was best described by the Lagergren pseudofirst order kinetic equation (R<sup>2</sup>=0.998). This study has demonstrated the suitability of WTRG for the removal of naphthalene from aqueous solution.

Adsorption of Pb2+ in Wastewater Using Adsorbent Derived from Grapefruit Peel

2011 ◽  
Vol 391-392 ◽  
pp. 968-972 ◽  
Author(s):  
Yuan Yuan Pei ◽  
Jing Yong Liu
Keyword(s):  
Adsorption Kinetics ◽  
Contact Time ◽  
Removal Rate ◽  
Ion Concentration ◽  
Affecting Factors ◽  
Solution Ph ◽  
Isothermal Adsorption ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
Kinetics Of

The adsorbent was prepared from Grapefruit peel by activation with ZnCl2. Grapefruit peel adsorbent (GPA) was employed to be as adsorbent to remove Pb(Ⅱ) in wastewater. The affecting factors on the adsorption of Pb(Ⅱ)from aqueous solution with GPA, such as solution pH, contact time, GPA dosage, initial Pb(Ⅱ) concentration, and reaction temperature were investigated. Adsorption kinetics and adsorption mechanism were investigated also. The results showed that the factors mentioned above have remarkably influence on adsorption of Pb(Ⅱ) ions onto GPA. The suitable conditions for the adsorption conditions were as following: solution pH, 5.3~6.5; contact time, 1.5 hours; GPA dosage, 10 g/L; initial Pb(Ⅱ) ion concentration, 100 mg/L; temperature, 30°C. Under the suitable conditions, the removal rate of Pb(Ⅱ) was more than 90% and the sorption capacities of the GPA for Pb(Ⅱ) were 12.73mg/g. Adsorption kinetics of Pb(Ⅱ) ions onto GPA obeyed pseudo-second-order equation. The isothermal adsorption can be described well by Langmuir, Freundlich and Temkin models, and the Freundlich model was the best.

scholarly journals Evaluation of Kinetic and Equilibrium Parameters of NiFe2O4 Nanoparticles on Adsorption of Reactive Orange Dye from Water

2016 ◽  
Vol 10 (2) ◽  
pp. 51-58
Author(s):  
Raziyeh Zandi Pak ◽  
◽  
Soheil Sobhan Ardakani2 ◽  
Keyword(s):  
Contact Time ◽  
Magnetic Nanomaterials ◽  
X Ray Diffraction ◽  
Anionic Dyes ◽  
Solution Ph ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
Nife2o4 Nanoparticles ◽  
Reactive Orange ◽  
Kinetics Of

Background: Among different pollutants released into the environment, dyes are considered as one of the most dangerous contaminants. In recent years, magnetic nanomaterials have attracted much attention for their dye removal capacity. The aim of this study was to explore the adsorption kinetics of an anionic dye (Reactive Orange 13 (RO)) by NiFe2O4 nanoparticles (NiFe2O4 NPs) under various conditions. Methods: NiFe2O4 nanoparticles (NiFe2O4 NPs) were prepared and characterized by X-ray diffraction (XRD), transmission electronic microscopy (TEM), pHpzc and BET methods. The adsorption characteristics of the NiFe2O4 NPs adsorbent were examined using Reactive Orange 13 as an adsorbate. The influences of parameters including pH, dose of adsorbent and contact time were investigated to find the optimum adsorption conditions. Results: Decreasing solution pH and increasing contact time were favorable for improving adsorption efficiency. The kinetic and isotherm data of RO adsorption on NiFe2O4 NPs were well fitted by pseudo-second-order and Langmuir models, respectively. Conclusion: The maximal adsorption capacity of RO was 243.9 mg g-1 at 25◦C and pH 3.0 and the adsorption of RO on the NiFe2O4 NPs follows a monolayer coverage model. NiFe2O4 NPs might be an effective and potential adsorbent for removing anionic dyes from aqueous solutions.

Adsorption of Pb (II) from Aqueous Solutions on Expanded Graphite

2011 ◽  
Vol 361-363 ◽  
pp. 55-58
Author(s):  
Ying Hua Zhao ◽  
Jin Hui Dong ◽  
Ying Chen Zhang ◽  
Min Cong Zhu ◽  
Deng Xin Li
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Aqueous Solutions ◽  
Electron Micrographs ◽  
Contact Time ◽  
Removal Rate ◽  
Expanded Graphite ◽  
Scanning Electron Micrographs ◽  
Scanning Electron ◽  
Maximum Removal

Expanded graphite (EG) was prepared by microwave irradiation at 1000 w for 60 s. It is a novel adsorbent for Pb (Ⅱ) adsorption. This paper aims to investigate the effect of the adsorption of EG. The adsorption behavior of Pb (Ⅱ) from aqueous solution onto EG was investigated with variety of parameters such as pH, adsorbents dosage, initial Pb (Ⅱ) concentration, contact time and temperature. On conditions that the pH=6.04,the dosage of adsorbent was 0.075g, the concentration of Pb(Ⅱ) was 100mg/L and the temperature was 15°C, the maximum removal rate could reach at 86.55% .The results showed that the EG was an efficient and novel adsorbent for the removal of lead from aqueous solution. The microstructures of the resultant expanded graphite were observed by scanning electron micrographs.

scholarly journals Cosmetic wastewater primary treatment by fenton process and final polishing adsorption

2020 ◽  
Vol 24 ◽  
pp. 13
Author(s):  
Lisiée Manzoli Gonçalves Pereira ◽  
Maria Eugênia de Oliveira Ferreira ◽  
Núbia Natália de Brito ◽  
Indianara Conceição Ostroski
Keyword(s):  
Contact Time ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Environmental Parameters ◽  
Primary Treatment ◽  
Total Iron ◽  
Fenton Process ◽  
Ph Values ◽  
Treatment Technologies ◽  
Maximum Removal

This work aimed to integrate two wastewater treatment technologies, Fenton process as the primary treatment and adsorption aiming achieve maximum removal efficiency and adequation to the environmental and water legislations. Wastewater from a cosmetics industry plant in the metropolitan area of Goiânia (Brazil) was the object of this research. It was analysed environmental parameters as absorbance, total iron, chemical oxygen demand, pH, total phenols, conductivity, H2O2, dissolved oxygen, turbidity, and total solids. They were analyzed in between processes at all stages.  The effects of Fe2+ (18.42-257.89 mg L-1) and H2O2 (500-2300 mg L-1) concentrations and pH values (3.00-5.50) were studied for the Fenton process treatment. In adsorption, the activated carbon was characterized by infrared spectroscopy, elemental analysis, adsorption and desorption of N2 and thermogravimetry (TG/DTA). The effect of the contact time (4min-24h) and of the temperature variation in the system 20-60 °C were studied. By integrating the two technologies, a satisfactory removal rate was achieved for the analyzed parameters in the total time of treatment of 82 minutes

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