scholarly journals Response surface methodology approach for adsorptive removal of Reactive Blue 19 onto green pea pod

2020 ◽  
Vol 81 (6) ◽  
pp. 1137-1147
Author(s):  
Elçin Demirhan
Keyword(s):  
Ph Value ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Model ◽  
Coefficient Of Determination ◽  
Order Model ◽  
Reactive Blue 19 ◽  
Pea Pod ◽  
Green Pea ◽  
Second Order Model

Abstract In the present study, removal of Reactive Blue 19 dye by using green pea pod as a low-cost adsorbent was investigated. Box–Behnken design was used to determine the independent and interaction influences of process variables of pH, temperature and adsorbent amount. The variance analysis (ANOVA) results showed that the second order model with high coefficient of determination value (R2 = 0.9997) was statistically significant. The experimental results stated that the removal efficiency increased when the pH value decreased and the adsorbent amount increased. The maximum removal (99.42%) was obtained at pH 2, temperature of 35 °C and adsorbent amount of 1.5 g/100 mL. The equilibrium data investigation showed that the Freundlich isotherm model fitted better for removal of dye than did the Langmuir isotherm model. Furthermore, the adsorption kinetic was also evaluated and it was found that the adsorption followed the pseudo second order model for the Reactive Blue 19 removal onto green pea pod.

scholarly journals Study of Fluoride Affinity by Zirconium Impregnated Walnut Shell Carbon in Aqueous Phase: Kinetic and Isotherm Evaluation

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
M. Rajan ◽  
G. Alagumuthu
Keyword(s):  
Ph Value ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Walnut Shell ◽  
Fluoride Removal ◽  
Order Model ◽  
Intraparticle Diffusion Model ◽  
Bicarbonate Ions ◽  
Pseudo Second Order ◽  
Second Order Model

This paper examines the kinetics of fluoride removal from water by the adsorbent zirconium-impregnated walnut-shell carbon (ZIWSC), exploring the mechanisms involved. The dependence of the adsorption of fluoride on the pH of the solution has been studied to achieve the optimum pH value and a better understanding of the adsorption mechanism. The presence of bicarbonate ions in aqueous solution was found to affect the fluoride removal indicating that these anions compete with the sorption of fluoride on adsorbents. The kinetic profile has been modeled using pseudo-first-order model, pseudo-second-order model, and intraparticle diffusion model. The kinetic sorption profiles offered excellent fit with pseudo-second-order model. Adsorption isotherms have been modeled by Langmuir, Freundlich, and Temkin equations, and their constants were determined. The equilibrium adsorption data were fitted reasonably well for Freundlich isotherm model. XRD and SEM patterns of the ZIWSC were recorded to get better insight into the mechanism of adsorption process.

Adsorption Kinetics of Pb2+ Ions Using Chitosan Nanoparticles

2013 ◽  
Vol 367 ◽  
pp. 45-49
Author(s):  
Ying Hong ◽  
Ze Hui Zhong ◽  
You Shi Liu
Keyword(s):  
Adsorption Kinetics ◽  
Chitosan Nanoparticles ◽  
Second Order ◽  
Isotherm Model ◽  
Order Model ◽  
Adsorption Characteristics ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Second Order Model

Chitosan nanoparticles were prepared by crosslinkingusing TPP. SEM showed that chitosan nanoparticles were successfully obtained.The adsorption characteristics of chitosan nanoparticles were evaluated. Theresults demonstrated that chitosan nanoparticles were suitable for adsorbent toremoval Pb2+. The parameters for the adsorption of Pb2+by chitosan nanoparticles were also determined. It was shown that chitosannanoparticles were fit for Langmuir’s isotherm model and that the adsorptionkinetics of Pb2+ described by the pseudo-second-order model could bebest.

scholarly journals Sythesis of Nano Zerovalent Iron Supported Sawdust (NZVI/SD) and Its Application for Removal of Arsenic (III) from Aqueous Solution

2020 ◽  
pp. 1-12
Author(s):  
Tasrina R. Choudhury ◽  
Snahasish Bhowmik ◽  
M. S. Rahman ◽  
Mithun R. Nath ◽  
F. N. Jahan ◽  
...  
Keyword(s):  
Ph Value ◽  
Ferrous Sulphate ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Zerovalent Iron ◽  
Isotherm Model ◽  
Order Kinetic ◽  
Adsorption Sites ◽  
Adsorption Data ◽  
Pseudo Second Order

Sawdust supported nano-zerovalent (NZVI/SD) iron was synthesized by treating sawdust with ferrous sulphate followed by reduction with NaBH4. The NZVI/SD was characterized by SEM, XRD, FTIR and Chemical method. Adsorption of As (III) by NZVI/SD was investigated and the maximum uptake of As (III) was found at pH value of 7.74 and equilibrium time of 3 hrs. The adsorption isotherm modelling revealed that the equilibrium adsorption data were better fitted with the Langmuir isotherm model compared with the Freundlich Isotherm model. This study revealed that the maximum As (III) ions adsorption capacity was found to be 12.66 mg/g for using NZVI/SD adsorbent. However, the kinetics data were tested by pseudo-first-order and pseudo-second-order kinetic models; and it was observed that the adsorption data could be well fitted with pseudo-second-order kinetics for As (III) adsorption onto NZVI/SD depending on both adsorbate concentration and adsorption sites. The result of this study suggested that NZVI/SD could be developed as a prominent environment-friendly adsorbent for the removal of As (III) ions from aqueous systems.

Removal of Pb (II) from Aqueous Solution by Blast-Furnace Slags

2013 ◽  
Vol 726-731 ◽  
pp. 2736-2741
Author(s):  
Ming Da Liu ◽  
Ge Tian ◽  
Liang Jie Zhao ◽  
Yao Sheng Wang ◽  
Lei Guo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Blast Furnace ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Second Order ◽  
Order Model ◽  
Pseudo Second Order ◽  
Solution Kinetic ◽  
Second Order Model

Five blast-furnace slags were used as adsorbents to remove Pb (II) from aqueous solution. Kinetic studies showed that the sorption process was best described by pseudo-second-order model. Among Langmuir, Freundlich and Temkin isotherms, the Freundlich isotherm had a better fit with the simulation of the adsorption of Pb (II).

Adsorption Kinetics of Zn(II) from Aqueous Solutions onto Epichlorohydrin Crosslinked Chitosan

2012 ◽  
Vol 463-464 ◽  
pp. 7-11 ◽  
Author(s):  
Ming Yan Dang ◽  
Hong Min Guo ◽  
Yan Kun Tan
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Crosslinking Agent ◽  
Second Order ◽  
Order Model ◽  
Pseudo Second Order ◽  
Crosslinked Chitosan ◽  
Kinetics Of ◽  
Second Order Model

Chitosan was crosslinked using epichlorohydrin as crosslinking agent to prepare crosslinked chitosan which was used as an adsorbent for the removal of Zn(II) from aqueous solutions. The adsorption prosperities of Zn(II) on crosslinked chitosan were studied, including the influence of pH value and the adsorption kinetics. The kinetics of adsorption was discussed using two kinetic models, the pseudo first-order and the pseudo second-order model. Results reveal that the crosslinked chitosan is suitable as adsorbent to remove Zn(II) from dilute solution. The rate parameters for the Zn(II) by crosslinked chitosan were also determined. It was shown that the adsorption kinetics of Zn(II) could be best described by the pseudo second-order model and the adsorption process may involve a physical adsorption.

scholarly journals Removal of chlorophenols from aqueous solutions by sorption onto walnut, pistachio and hazelnut shells

2015 ◽  
Vol 17 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Krzysztof Kuśmierek ◽  
Andrzej Świątkowski
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Data ◽  
Freundlich Isotherm ◽  
Solution Concentration ◽  
Second Order ◽  
Coefficient Of Determination ◽  
Order Model ◽  
Isotherm Equation ◽  
Pseudo Second Order ◽  
Hazelnut Shells

Abstract The efficiency of walnut, pistachio and hazelnut shells to remove three monochlorophenols (2-CP, 3-CP and 4-CP) from aqueous solutions has been investigated. To describe the kinetic data pseudo-first and pseudo-second order models were used. The kinetics data were fitted better into the pseudo-second order model with the coefficient of determination values greater than 0.99. The k2 values increased in the order 4-CP < 3-CP < 2-CP. Sorption was also analyzed as a function of solution concentration at equilibrium. The experimental data received were found to be well described by the Freundlich isotherm equation. Effectiveness of chlorophenols removal from water on the walnut, pistachio and hazelnut shells was comparable. Individual differences in sorption of monochlorophenols were also negligible.

scholarly journals Kinetics and equilibriums adsorption of Cu (II) ion by chitosan and cross-linked chitosan-bentonite

REAKTOR ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 117-124
Author(s):  
Hargono Hargono ◽  
Angga Mei Sarah ◽  
Feninda Nevrita ◽  
Bakti Jos
Keyword(s):  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Models ◽  
Order Model ◽  
Equilibrium Studies ◽  
Test Parameters ◽  
Constant Rate ◽  
Pseudo Second Order ◽  
The Impact ◽  
Second Order Model

The sorption of Cu (II) particle from aqueous solution onto chitosan and cross-connected chitosan-bentonite (CTS-BTN) as adsorbent were conducted in batch conditions. The impact of different test parameters: starting pH, sorption time was assessed. Equilibrium studies have been completed to decide the limit of chitosan and CTS-BTN for Cu (II) particle. The Langmuir and Freundlich isotherm models were used in the examination of the trial information as linearized conditions. It was discovered that the isotherm information were all around portrayed by the Langmuir isotherm. Chitosan and CTS-BTN showed an adsorption capacity of 125 mg/g and 142.86 mg/g, respectively. The constant of adsorption rate was investigation utilizing a pseudo first order and a pseudo second order model. The pseudo second order model brought about the best fit with test information (R2= 0,991 for CTS and R2= 0,995 for CTS-BTN), additionally giving a constant rate k2, ads= 8.85 x 10-5 g/mg min for CTS and 3.72 x 10-4 g/mg min for CTS-BTN. Recommending that this model could be used in design and applications.Keywords:  adsorption; Cu(II) ion; chitosan; cross-linked; isotherm; kinetics

scholarly journals REMOVAL OF DIVALENT CADMIUM IONS FROM AQUEOUS SOLUTION USING LANTANA CAMARA LEAVES BIOCARBON

2019 ◽  
pp. 36-42
Author(s):  
S. Starlin Shyla ◽  
R. Mohan Kumar ◽  
M. Singanan
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Ph Value ◽  
Second Order ◽  
Lantana Camara ◽  
Ion Concentration ◽  
Order Model ◽  
Cadmium Removal ◽  
Cadmium Ions ◽  
Second Order Model

The objective of this study is to investigate the removal of divalent cadmium ions from an aqueous solution using Lantana camara leaves biocarbon (LCBC). Batch experiments are conducted to test the effects of various parameters such as pH, initial metal ion concentration, amount of biocarbon, and contact time on the cadmium removal process at room temperature, which allows establishing as the optimum conditions a pH value of 4.0 and 2.5g/100 mL of biocarbon dose at the equilibrium time of 180 min. The maximum percentage removal of cadmium is 93.30%. Langmuir and Freundlich adsorption isotherms are used to verify the adsorption parameters, and the experimental data is well fitted to the Langmuir model. Analysis of the biosorption kinetics shows that the pseudo-second-order model is well fitted for Cd (II) ions removal. The correlation coefficient (r2) for the second-order model is 0.9848. The results reveal LCBC as an efficient, low cost, and harmless to environment adsorbent for the removal of Cd (II) ions in the biosorption process.

Adsorption of Phthalate Esters (PAEs) from Aqueous Solution onto Activated Carbons from Softstem Bulrush

2010 ◽  
Vol 152-153 ◽  
pp. 791-796
Author(s):  
Hui Jun Xie ◽  
Qiang Ma ◽  
Wei Tan ◽  
Jian Zhang
Keyword(s):  
Aqueous Solution ◽  
Activated Carbons ◽  
Phthalate Esters ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Order Model ◽  
First Order ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Second Order Model

Removal of Phthalate Easters (PAEs) by softstem bulrush carbon (SBC) in aqueous solution was studied. In this work, the effects of pH, adsorbent dosage (0.8-2.8g), and initial DMP concentration (20-100 mg/L) on the adsorption system were investigated. It turned out that the effective pH was 7.0 and the optimum adsorbent dose was 2.0 g/L. Equilibrium experimental data at 283, 293 and 308 K were better represented by Freundlich isotherm than Langmuir isotherm. In addition, adsorption kinetics was determined using pseudo-first-order model, pseudo-second-order model. The results indicated that the adsorption of DMP onto SBC followed pseudo-second-order model.

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