scholarly journals Abatement of Azo Dye from Wastewater Using Bimetal-Chitosan

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ghorban Asgari ◽  
Bahman Ramavandi ◽  
Sima Farjadfard
Keyword(s):  
Experimental Data ◽  
Azo Dye ◽  
Dye Adsorption ◽  
Maximum Adsorption Capacity ◽  
Orange Ii ◽  
Dye Wastewater ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Time Required ◽  
Best Fit

We introduce a new adsorbent, bimetallic chitosan particle (BCP) that is successfully synthesized and applied to remove the orange II dye from wastewater. The effects of pH, BCP quantity, and contact time are initially verified on the basis of the percentage of orange II removed from the wastewater. Experimental data reveal that the Cu/Mg bimetal and chitosan have a synergistic effect on the adsorption process of the adsorbate, where the dye adsorption by Cu/Mg bimetal, chitosan alone, and bimetal-chitosan is 10, 49, and 99.5%, respectively. The time required for the complete decolorization of orange II by 1 mg/L of BCP is 10 min. The Langmuir model is the best fit for the experimental data, which attains a maximum adsorption capacity of 384.6 mg/g. The consideration of the kinetic behavior indicates that the adsorption of orange II onto the BCP fits best with the pseudo-second-order and Elovich models. Further, the simulated azo dye wastewater can be effectively treated using a relatively low quantity of the adsorbent, 1 mg/L, within a short reaction time of 20 min. Overall, the use of BCP can be considered a promising method for eliminating the azo dye from wastewater effectively.

Adsorption of Ce(III) by Magnetic Chitosan/Yeast Composites from Aqueous Solution: Kinetic and Equilibrium Studies

2013 ◽  
Vol 316-317 ◽  
pp. 391-394 ◽  
Author(s):  
Hong Xiang Ou ◽  
Wei Bai Bian ◽  
Xiang Mei Weng ◽  
Wei Hong Huang ◽  
Yun Lei Zhang
Keyword(s):  
Experimental Data ◽  
Kinetic Data ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Studies ◽  
Magnetic Chitosan ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Magnetic Stability ◽  
Ph Range

Magnetic chitosan/yeast(MCY) composites were prepared and applied to adsorb Ce(III) ions from aqueous solutions. The effects of pH, contact time and initial concentration were examined, and the hematite leakage was also studied. The optimum pH was 5.5. MCY composites had magnetic stability (especially over pH range of 4.5~7.0). The kinetic data were investigated by pseudo-first-order and pseudo-second-order models. The kinetic data were better fitted to the pseudo-second-order model. Experimental data were fitted with the Langmuir and Freundlich models to analyze the equilibrium isotherms. The Freundlich model was better to describe the experimental data. The maximum adsorption capacity calculated by Langmuir isotherm was 73.53 mg/g.

scholarly journals Kinetics, Isotherms and Thermodynamic Studies on Removal of Divalent Copper using Mallet Flower Leaf Powder as Bio-Adsorbent

2021 ◽  
Vol 18 (24) ◽  
pp. 1431
Author(s):  
Devarapalli Venkata Padma ◽  
Susarla Venkata Ananta Rama Sastry
Keyword(s):  
Experimental Data ◽  
Atomic Absorption ◽  
Kinetic Data ◽  
Maximum Adsorption Capacity ◽  
Divalent Copper ◽  
Order Model ◽  
Leaf Powder ◽  
Pseudo Second Order ◽  
Best Fit ◽  
Agitation Time

The effectiveness and efficacy of Mallet Flower Leaf Powder (MFLP) as a bio-sorbent for the removal of heavy metal copper ions from the aqueous solutions have been studied. Experiments were conducted varying the pH, agitation time, temperature, biosorbent size and dosage as parameters. Speed of the mixing is kept at 200 rpm. The analysis of copper was done by using Atomic Absorption Spectrophotometer (AAS). The adsorption of copper was found to be dependent on pH and a maximum removal of 98.78 % was obtained at an optimum pH of 6.0. The optimum biosorbent dosage was 1 g for an agitation time of 40 min. The biosorption data obtained were validated for the best isotherm. The data collected were verified with the available adsorption isotherms. Experimental data obtained was well represented by Langmuir (RL = 0.161, qm = 5.96 mg/g, R2 = 0.9142), Freundlich (n = 0.64, Kf  = 0.79L/g, R2 = 0.9995) and Tempkin (R2 = 0.9083, bT = 267.63) isotherms, indicating favorable biosorption. The experimental data obtained were tested for the best fit and the Freundlich Model has yielded the best correlation with the highest regression coefficient, R2 = 0.9844. Kinetic data has also been presented using thermodynamic analysis and the pseudo second order model was found to be the best fit with a correlation coefficient of 0.999. For the removal of copper from the solution, bioadsorbent showed a maximum adsorption capacity of 5.96 mg/g. HIGHLIGHTS Removal of divalent copper from the aqueous solution using Mallet Flower Leaf powder Atomic Absorption Spectroscopy, Scanning Electron Microscopy and Fourier transform infrared analysis were used to characterize the Mallet Flower Leaf Powder Kinetic data has been presented using thermodynamic analysis and the pseudo second order model was found to be the best fit with a correlation coefficient of 0.999 The maximum adsorption capacity of MFLP for copper was found to be 5.96 mg/gm GRAPHICAL ABSTRACT

scholarly journals Removal of the pesticide methomyl contained in simulated effluent from equipment washing by adsorption in residual orange bagasse

2020 ◽  
Vol 9 (11) ◽  
pp. e3569118528
Author(s):  
Thiago Ruiz Zimmer ◽  
Jailton Marques Silva ◽  
Diego Henrique de Aquino Rocha ◽  
Helder Lopes Teles ◽  
Domingos Sávio Barbosa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Adsorption Capacity ◽  
Simulated Effluent ◽  
Carboxylic Groups ◽  
Effects Of Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Solid Liquid ◽  
Best Fit

This work consists of the study of methomyl removal, an extremely toxic carbamate pesticide, contained in aqueous solutions synthesized, by adsorption in residual orange bagasse from industrial juices processing. The adsorption kinetics was studied by obtaining the best fit for the model of pseudo-second order (R2= 0.949). The Langmuir isotherm model adjusted better to the experimental data confirming the adsorption in monolayers, without interaction among the adsorbate molecules. The scanning electron microscopy (SEM) revealed that particulate adsorbents have rather irregular surface, but with rigid structure and virtually no internal pores. The characterization of the functional groups by infrared spectroscopy (FTIR) revealed the presence of hydroxyl, Carbonyl and carboxylic groups on the adsorbents particles surface. Central composite rotational design 2x2 (DCCR 2x2) was used for the statistical study of the effects of pH and solid/liquid ratio (R) on the methomyl adsorption capacity in orange bagasse particles. The obtained mathematical model adjusted well to the experimental data (R2= 95%). In the studied intervals the highest values of adsorption capacity (q) were 3.73 and 3.43 (mg.g-1), obtained under the conditions of pH 6.0 with R 0.017 g.mL-1 and pH 4.5 with R 0.015 g.mL-1, respectively. Thus, it was possible to conclude that there was a greater adsorption in assays containing greater adsorbent mass in pH slightly acid.

Adsorption of Pb(II) by Silica/Yeast Composites from Aqueous Solution: Kinetic and Equilibrium Studies

2012 ◽  
Vol 496 ◽  
pp. 476-479
Author(s):  
Hong Xiang Ou ◽  
Yu Jun Song ◽  
Ling Rui Li ◽  
Wei Hong Huang
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Langmuir Isotherm ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Studies ◽  
Kinetic Rates ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Solution Kinetic

Silica/yeast composites were prepared for removal of Pb(II) from aqueous solution. The effects of pH, contact time and initial concentration were examined. The optimum pH was 5.0. The kinetic data were investigated by pseudo-first-order and pseudo-second-order models. The kinetic rates were better fitted to the pseudo-second-order model. The experimental data were fitted with the Langmuir and Freundlich models to analyze the equilibrium isotherms. The maximum adsorption capacity calculated from Langmuir isotherm was 73.53 mg/g. The Langmuir isotherm was more favorable to describe the experimental data.

scholarly journals Kinetic Study of the Bioadsorption of Methylene Blue on the Surface of the Biomass Obtained from the Algae D. antarctica

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jhonatan R. Guarín ◽  
Juan Carlos Moreno-Pirajan ◽  
Liliana Giraldo
Keyword(s):  
Methylene Blue ◽  
Kinetic Study ◽  
Adsorption Capacity ◽  
Scientific Community ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Best Fit ◽  
Total Elimination ◽  
Purification Of Water

Currently, there is a great pollution of water by the dyes; due to this, several studies have been carried out to remove these compounds. However, the total elimination of these pollutants from the aquatic effluents has represented a great challenge for the scientific community, for which it is necessary to carry out investigations that allow the purification of water. In this work, we studied the bioadsorption of methylene blue on the surface of the biomass obtained from the algae D. antarctica. This material was characterized by SEM and FTIR. To the data obtained in the biosorption experiments, different models of biosorption and kinetics were applied, finding that the best fit to the obtained data is given by applying the pseudo-second-order models and the Toth model, respectively. It was also determined that the maximum adsorption capacity of MB on the surface of the biomass is 702.9 mg/g, which shows that this material has great properties as a bioadsorbent.

Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite

2014 ◽  
Vol 70 (4) ◽  
pp. 678-684 ◽  
Author(s):  
Jun Chen ◽  
Xiaoqin Hong ◽  
Yongteng Zhao ◽  
Qianfeng Zhang
Keyword(s):  
Adsorption Capacity ◽  
Chemical Oxidation ◽  
Maximum Adsorption Capacity ◽  
Isothermal Model ◽  
Adsorption Characteristic ◽  
In Situ Chemical Oxidation ◽  
Acid Copolymer ◽  
Chemical Oxidation Polymerization ◽  
Effects Of Ph ◽  
Pseudo Second Order

Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the surface of the clay platelets, which can be used as a dopant of PANI and play a ‘bridge’ role to combine PANI with clay. Adsorption experiments were carried out to study the effects of pH, contact time, Cr(VI) concentration, adsorbent dose and temperature. The adsorption of Cr(VI) on the PANI/MMT was highly pH dependent and the adsorption kinetics followed a pseudo-second-order model. The Langmuir isothermal model described the adsorption isotherm data well and the maximum adsorption capacity increased with the increase in temperature. Thermodynamic investigation indicated that the adsorption process is spontaneous, endothermic and marked with an increase in randomness at the adsorbent – liquid interface. The maximum adsorption capacity of the PANI/MMT composites for Cr(VI) was 308.6 mg/g at 25 °C. The excellent adsorption characteristic of exfoliated PANI/MMT composites will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.

Kinetics of Glyphosate Adsorption on Composite Resin from Aqueous Solution

2013 ◽  
Vol 803 ◽  
pp. 157-160
Author(s):  
Zhen Zhen Kong ◽  
Dong Mei Jia ◽  
Su Wen Cui
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Composite Resin ◽  
Order Equation ◽  
Second Order ◽  
First Order ◽  
Basic Resin ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Best Fit

The composite weakly basic resin (D301Fe) was prepared and examined using scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption kinetics of glyphosate from aqueous solution onto composite weakly basic resin (D301Fe) were investigated under different conditions. The experimental data was analyzed using various adsorption kinetic models like pseudo-first order, the pseudo-second order, the Elovich and the parabolic diffusion models to determine the best-fit equation for the adsorption of glyphosate onto D301Fe. The results show that the pseudo-second order equation fitted the experimental data well and its adsorption was chemisorption-controlled.

Equilibrium and Kinetics Studies for Adsorption of Cu(II) from Aqueous Solution by Modified Phosphogypusum

2012 ◽  
Vol 518-523 ◽  
pp. 369-375 ◽  
Author(s):  
Yue Hong Yang ◽  
Dun Tao Shu ◽  
Ting Dong Fu ◽  
Huai Yu Zhang
Keyword(s):  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Wet Process ◽  
Removal Capacity ◽  
Adsorbate Concentration ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Best Fit

The purpose of this study was to investigate the adsorption of Cu(II) on phosphogypsum, a waste material from the manufacture of phosphoric acid by wet process. The removal capacity of phosphogypsum for Cu(II) ions was studied as a function of solution pH, contact time, adsorbent dosage and adsorbate concentration. Before batch adsorption study, phosphogypsum was pre-conditioned by calcine without water. The Langmuir and Freundlich theories were used to describe the Cu(II) adsorption process, and the Freundlich isotherm showed the best fit to the process. The adsorptions of Cu(II) followed pseudo-second-order kinetics. Maximum adsorption capacity of lime-preconditioned phosphogypsum was found to be 2.824 mg/g. The results showed that the phoshogypsum is a suitable adsorbent for the removal of Cu(II) ions from aqueous solutions.

scholarly journals Simultaneous Adsorption of Cr(VI) and Phenol from Binary Mixture Using Iron Incorporated Rice Husk: Insight to Multicomponent Equilibrium Isotherm

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ankur Gupta ◽  
Chandrajit Balomajumder
Keyword(s):  
Experimental Data ◽  
Rice Husk ◽  
Low Cost ◽  
Binary Solution ◽  
Multicomponent System ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Isotherm Models ◽  
Pseudo Second Order

Fe modified rice husk was prepared as a low cost biosorbent for the removal of Cr(VI) and phenol both singly and in combination from single and binary simulated synthetic waste water. Rice husk was modified by treating with FeSO4·7H2O. The results showed that impregnation of iron onto the surface of rice husk improved the adsorption capability of both Cr(VI) and phenol. The effects of process parameters for multicomponent system such as pH, adsorbent dose, and contact time onto the percentage removal of both Cr(VI) and phenol were investigated. The experimental data for the adsorption of both Cr(VI) and phenol onto the surface of Fe modified rice husk applied to various kinetic and adsorption isotherm models. Multicomponent isotherm models such as Nonmodified Langmuir, Modified Langmuir, Extended Langmuir, Extended Freundlich, Competitive Nonmodified Redlich Peterson, Competitive Modified Redlich Peterson were applied. The results show that Extended Freundlich model best described the experimental data for both Cr(VI) and phenol from binary solution. Pseudo second-order model agreed well with Cr(VI) while pseudo first-order model agreed well with phenol. Maximum adsorption capacity in synthetic binary solution of Cr(VI) and phenol was found to be 36.3817 mg g−1for Cr(VI) and 6.569 mg g−1for phenol, respectively.

scholarly journals Adsorption of tricresyl phosphate onto graphene nanomaterials from aqueous solution

2017 ◽  
Vol 76 (6) ◽  
pp. 1565-1573 ◽  
Author(s):  
Jun Liu ◽  
Siying Xia ◽  
Xiaomeng Lü ◽  
Hongxiang Shen
Keyword(s):  
Experimental Data ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Tricresyl Phosphate ◽  
Batch Mode ◽  
Order Kinetic Model ◽  
Endothermic Process ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Increasing Temperature

Phosphorus flame retardant tricresyl phosphate (TCP) adsorption on graphene nanomaterials from aqueous solutions was explored using batch and column modes. Comparative studies were performed regarding the kinetics and equilibrium of TCP adsorption on graphene oxide (GO) and graphene (G) in batch mode. The adsorption kinetics exhibited a rapid TCP uptake, and experimental data were well described by the pseudo-second-order kinetic model. Adsorption isotherm data of TCP on the two adsorbents displayed an improved TCP removal performance with increasing temperature at pH 5, while experimental data were well described by the Langmuir isotherm model with a maximum adsorption capacity of 87.7 mg·g−1 for G, and 30.7 mg·g−1 for GO) at 303 K. The thermodynamic parameters show that the adsorption reaction is a spontaneous and endothermic process. In addition, dynamic adsorption of TCP in a fixed G column confirmed a faster approach to breakthrough at high flow rate, high influent TCP concentration, and low filling height of adsorbent. Breakthrough data were successfully described by the Thomas and Yoon-Nelson models.

Sign in / Sign up

Export Citation Format

Share Document