scholarly journals Adsorptive Removal of Methylene Blue onto ZnCl2Activated Carbon from Wood Apple Outer Shell: Kinetics and Equilibrium Studies

2011 ◽  
Vol 8 (4) ◽  
pp. 1696-1707 ◽  
Author(s):  
N. Bhadusha ◽  
T. Ananthabaskaran
Keyword(s):  
Methylene Blue ◽  
Outer Shell ◽  
Blue Dye ◽  
Order Kinetic ◽  
Biomass Waste ◽  
Equilibrium Studies ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Limonia Acidissima

Methylene blue dye removal from aqueous solution was investigated using ZnCl2activated carbon prepared from wood apple outer shell (Limonia acidissima, biomass waste). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 35.1 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm model and pseudo second order kinetic model. Desorption studies showed that ion exchange mechanism might be involved in the adsorption process.

scholarly journals Kinetic, Thermodynamic and Equilibrium Studies on Uptake of Rhodamine B onto ZnCl2Activated Low Cost Carbon

2012 ◽  
Vol 9 (1) ◽  
pp. 137-144 ◽  
Author(s):  
N. Bhadusha ◽  
T. Ananthabaskaran
Keyword(s):  
Rhodamine B ◽  
Low Cost ◽  
Order Kinetic ◽  
Biomass Waste ◽  
Equilibrium Studies ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Limonia Acidissima ◽  
Carbonaceous Adsorbent

A carbonaceous adsorbent prepared from biomass waste like wood apple outer shell (Limonia acidissima) by ZnCl2treatment was investigated for its efficiency in removing Rhodamine B (RDB). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 46.7 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm model and pseudo second order kinetic model. Desorption studies showed that ion exchange mechanism might be involved in the adsorption process.

scholarly journals Heterogeneous Fenton-Like Oxidation of Methylene Blue Using Alternative Catalysts

2021 ◽  
Vol 29 (48) ◽  
pp. 91-97
Author(s):  
Juraj Michálek ◽  
Kseniya Domnina ◽  
Veronika Kvorková ◽  
Kristína Šefčovičová ◽  
Klaudia Mončeková ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Low Cost ◽  
Hydrogen Peroxide Solution ◽  
Blue Dye ◽  
Order Kinetic ◽  
Heterogeneous Fenton ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Black Nickel

Abstract The usage of the low-cost catalysts for methylene blue removal from wastewater was investigated. Heterogeneous Fenton-like process consists of the use of a hydrogen peroxide solution, and an iron-rich catalyst, red mud and black nickel mud were used for that purpose. The factors such as the catalyst dose and the hydrogen peroxide solution volume were monitored. The results of experiments showed that the degradation of methylene blue dye in Fenton-like oxidation process using selected catalysts can be described by a pseudo-second-order kinetic model. The highest dye removal efficiency (87.15 %) was achieved using the black nickel mud catalyst after 30 minutes of reaction.

scholarly journals Methylene Blue Dye Removal from Aqueous Media Using Activated Carbon Prepared by Lotus Leaves: Kinetic, Equilibrium and Thermodynamic Study

2021 ◽  
Vol 68 (2) ◽  
pp. 363-373
Author(s):  
Roya Salahshour ◽  
Mehdi Shanbedi ◽  
Hossein Esmaeili
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Sorption Process ◽  
Second Order ◽  
Blue Dye ◽  
Order Kinetic ◽  
Methylene Blue Dye ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Lotus Leaves

In the present work, methylene blue was eliminated from aqueous solution using activated carbon prepared by lotus leaves. To perform the experiments, batch method was applied. Also, several analyses such as SEM, FTIR, EDAX and BET were done to determine the surface properties of the activated carbon. The results showed that the maximum sorption efficiency of 97.59% was obtained in initial dye concentration of 10 mg/L, pH of 9, adsorbent dosage of 4 g/L, temperature of 25 °C, contact time of 60 min and mixture speed of 400 rpm. Furthermore, the maximum adsorption capacity was determined 80 mg/g, which was a significant value. The experimental data was analyzed using pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models, which the results showed that the pseudo-second order kinetic model could better describe the kinetic behavior of the sorption process. Also, the constant rate of the pseudo-second order kinetic model was obtained in the range of 0.0218–0.0345 g/mg.min. Moreover, the adsorption equilibrium was well described using Freundlich isotherm model. Furthermore, the thermodynamic studies indicated that the sorption process of methylene blue dye using the activated carbon was spontaneous and exothermic.

scholarly journals Utilization of Sawdust Waste Biomass as an Eco-Friendly Biosorbent for Bioremediation of Manganese Pollution in Aqueous Environment

2019 ◽  
Vol 2 (3) ◽  
pp. 823-830
Author(s):  
Fatih Deniz
Keyword(s):  
Operating Conditions ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Waste Biomass ◽  
Equilibrium Studies ◽  
Manganese Removal ◽  
Removal Capacity ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

In this study, the sawdust waste biomass was used as an eco-friendly biosorbent material for the bioremediation of manganese pollution in aqueous environment. The effects of various environmental variables such as pH, biosorbent amount, metal concentration and contact time on the manganese biosorption were studied in batch operating conditions. The kinetic and equilibrium studies were performed to elucidate the biosorption behavior of biosorbent material. The biosorption capacity of biosorbent was strongly influenced by the operating parameters. The experimental data were more successfully modeled by the pseudo-second-order kinetic model and Langmuir isotherm model compared to other models applied in the study. The maximum manganese removal capacity of biosorbent was found to be 25.655 mg g-1. These findings showed that the sawdust waste biomass can be used as an eco-friendly biosorbent material for the bioremediation of manganese pollution in aqueous environment.

Loess Composited PMAA-CS for Removing Methylene Blue

2018 ◽  
Vol 768 ◽  
pp. 231-235
Author(s):  
Ya Shen ◽  
Yin Wang ◽  
Yu Feng He ◽  
Rong Min Wang
Keyword(s):  
Methylene Blue ◽  
Removal Rate ◽  
Isotherm Model ◽  
Order Kinetic ◽  
Great Contribution ◽  
Adsorption Dynamics ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Polymer Adsorbent

Dyes have made a great contribution to the progress of this beautiful and bright world,but a large amount of wastes containing dyes have been discharged into the receiving aquatic environment. In this paper, a loess composited polymer adsorbent, poly (methacrylic acid)-grafted chitosan/Loess composite (PMAA-CS/ LC), was applied to remove methylene blue (MB). It was found that the removal rate of MB reached to 98.6% under the optimal condition of adsorption. Adsorption dynamics were consistent with pseudo-second-order kinetic model and isotherm model can meet the Langmuir isotherm model.

scholarly journals Application of Synthetic Layered Sodium Silicate Magadiite Nanosheets for Environmental Remediation of Methylene Blue Dye in Water

2017 ◽  
Author(s):  
Mohamed Mokhtar
Keyword(s):  
Methylene Blue ◽  
Environmental Remediation ◽  
Average Crystallite Size ◽  
Bet Surface Area ◽  
Blue Dye ◽  
Order Kinetic ◽  
Nano Clay ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Autogenous Pressure

The removal of methylene blue (MB) dye from water was investigated using synthetic nano-clay magadiite (SNCM). SNCM was synthesized by hydrothermal treatment under autogenous pressure. A rosette-shaped single mesoporous magadiite phase with 16.63 nm average crystallite size and 33 m2.g-1 BET-surface area was recorded. The adsorption results indicated the pronounced affinity of the SNCM to the MB dye molecules which reached adsorption uptake of 20.0 mg MB dye/g of SNCM. The elimination of MB dye by the SNCM was kinetically and thermodynamically considered; a pseudo second order kinetic model was attained, and a spontaneous, chemical, and exothermic in nature was verified.

The Study of the Modified Grain Sorghum Stalk to Remove Methylene Blue Dye from Aqueous Solution

2012 ◽  
Vol 430-432 ◽  
pp. 197-201
Author(s):  
Feng Yu Li ◽  
Sheng Hua Zhang ◽  
Jin Yi Chen
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Low Cost ◽  
Grain Sorghum ◽  
Blue Dye ◽  
Order Kinetic ◽  
Adsorption Processes ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Pyromellitic dianhydride(PMDA）- modified grain sorghum stalk was used as a novel low-cost adsorbent to remove cationic dye methylene blue(MB) from aqueous solution. Bath studies were carried out to investigate the effects of pH and retention time on the adsorption of MB. The adsorption process could obtain >98% removal percentage within 30 minutes as the MB concentration was at 200 and 300 mg/L. And for 400 mg/L MB, 99% was removed in 6 hrs. The kinetics study showed that the adsorption processes followed the pseudo-second-order kinetic model, which confirming that the sorption rate is controlled by chemical adsorption. Equilibrium isotherms were analyzed by the Langmuir and Freundlich models. Langmuir model can be fitted better than Freundlich with maximum monolayer adsorption capacity of 568.18 mg/g for MB.

scholarly journals Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Ebenezer Annan ◽  
Grace Karikari Arkorful ◽  
David Sasu Konadu ◽  
Bernard Asimeng ◽  
David Dodoo-Arhin ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Effect Of Temperature ◽  
Precipitation Process ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Thermodynamical Modeling

Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water.

scholarly journals Adsorption-Desorption Profile of Methylene Blue Dye on Raw and Acid Activated Kaolinite

2020 ◽  
Vol 20 (4) ◽  
pp. 755
Author(s):  
Nurul Ain Safiqah Md Sandollah ◽  
Sheikh Ahmad Izaddin Sheikh Mohd Ghazali ◽  
Wan Nazihah Wan Ibrahim ◽  
Ruhaida Rusmin
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Cost Effective ◽  
Blue Dye ◽  
Order Kinetic ◽  
Kaolinite Clay ◽  
Freundlich Model ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Adsorption Desorption

The efficiencies of raw (RK) and acid activated (0.5 M AAK) kaolinite clay minerals to remove methylene blue (MB) dyes in aqueous solution were investigated and compared. The 0.5 M AAK was prepared by treatment of RK in dilute 0.5 M HCl aqueous solution under reflux. Kaolinite adsorbents were characterized and their MB removal performances were evaluated via the batch method. MB desorption from spent kaolinites was investigated at pH 4 to 8. The MB removal was increased with increasing initial dye concentration, agitation speed and adsorbent dosage in 60 min reaction time at pH 6. Both kaolinites showed high MB removal (up to 97%). The Freundlich model has the best-fit equilibrium adsorption isotherm model for RK and 0.5 M AAK. The kinetic data for both adsorbents showed strong agreement with the pseudo second order kinetic model (r2 > 0.98). Nevertheless, the spent RK adsorbent demonstrated a significant higher MB retention than 0.5 M AAK in desorption experiments. Kaolinite clays have great potential as cost-effective materials for dyes removal in wastewater treatment.

scholarly journals Removal of methylene blue by biosorption onto Stipa tenacissima L. (Alfa) plants: Kinetics, equilibrium and thermodynamic studies

2021 ◽  
pp. 33-44
Author(s):  
Samir Ladjali ◽  
Nadjib Dahdouh ◽  
Samira Amokrane ◽  
El Mekatel ◽  
Djamel Nibou
Keyword(s):  
Methylene Blue ◽  
Contact Time ◽  
Blue Dye ◽  
Order Kinetic ◽  
Liquid Ratio ◽  
Stipa Tenacissima ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Solid Liquid

This study examines the ability of Stipa tenacissima L. (Alfa) to biosorb the Methylene Blue dye. Biosorption tests were performed in aqueous solution based on certain essential parameters such as solution?s pH (2-12), solid/liquid ratio (1-6 g/L), initial dye concentration (25-125 mg/L) and contact time (0-300 min). The Langmuir, Freundlich, Temkin and Elovich models were applied. It was found that the equilibrium data could be fitted to the Langmuir isotherm for MB biosorption with a maximum capacity qmax 55, 95 mg/g. The kinetic study shows that the experimental data correspond to the pseudo-second order kinetic model. The negative Gibbs values free energy ?G? reveal the spontaneity of MB biosorption at the surface of Stipa tenacissima L. The positive value of ?H? reveals the endothermic nature of the process.

Sign in / Sign up

Export Citation Format

Share Document