Related Experiment Video
Updated: Jul 18, 2026
Multi-step Preparation Technique to Recover Multiple Metabolite Compound Classes for In-depth and Informative Metabolomic Analysis
Published on: July 11, 2014
Removal of methylene blue from aqueous solution by peat
A N Fernandes1, C A P Almeida, C T B Menezes
1Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil. andreia@qmc.ufsc.br
Abstract:
In this study, the removal of methylene blue (MB) from aqueous solution by peat was analyzed. The peat was collected from a peatland at Arroio do Silva Beach, in Santa Catarina state, in the south of Brazil. Adsorption was conducted using varied initial concentrations of the MB solutions and three different temperatures (35, 45 and 60 degrees C). An adsorption time of around 4.5h was sufficient to reach the equilibrium for all temperatures, in the concentration range studied. Percentage removal was greater for diluted solutions, but the absolute amount of MB adsorbed by the peat at equilibrium increased with an increase of the initial concentration, corroborating the efficacy of the material as an adsorbent. Temperature influenced slightly the reaction, which was endothermic. Results indicated a multi-layered process and the data were analyzed considering pseudo-first-order, pseudo-second-order and intraparticle diffusion approaches. The latter two mechanisms seem to be significant in the rate-controlling step.
Insights
Peat effectively removes methylene blue (MB) from water. This study shows peat adsorption is efficient, slightly endothermic, and influenced by concentration and temperature, with multi-layered adsorption mechanisms.
Area of Science:
- Environmental Science
- Adsorption Science
- Materials Science
Background:
- Methylene blue (MB) is a common dye pollutant in wastewater.
- Peat is an abundant natural material with potential adsorbent properties.
- Efficient and cost-effective dye removal methods are crucial for environmental protection.
Purpose of the Study:
- To investigate the efficacy of Brazilian peat for methylene blue removal from aqueous solutions.
- To analyze the influence of initial MB concentration and temperature on adsorption.
- To determine the adsorption kinetics and mechanisms involved.
Main Methods:
- Adsorption experiments using peat from Arroio do Silva Beach, Brazil.
- Varied initial concentrations of methylene blue solutions.
- Adsorption conducted at three temperatures: 35°C, 45°C, and 60°C.
- Kinetic analysis using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models.
Main Results:
- Peat demonstrated significant methylene blue removal efficiency.
- Adsorption equilibrium was reached in approximately 4.5 hours across all tested temperatures.
- Higher initial MB concentrations led to increased absolute adsorption, indicating peat's adsorbent efficacy.
- The adsorption process was slightly endothermic and suggested a multi-layered adsorption mechanism.
- Pseudo-second-order and intraparticle diffusion were identified as significant rate-controlling steps.
Conclusions:
- Brazilian peat is a viable and effective adsorbent for methylene blue removal.
- The adsorption process is influenced by concentration and temperature, with a slightly endothermic nature.
- The study elucidates the adsorption mechanisms, highlighting the importance of pseudo-second-order and intraparticle diffusion kinetics.
More Related Videos
07:51A Multi-Omics Extraction Method for the In-Depth Analysis of Synchronized Cultures of the Green Alga Chlamydomonas reinhardtii
Published on: August 8, 2019
08:14Extraction of Non-Protein Amino Acids from Cyanobacteria for Liquid Chromatography-Tandem Mass Spectrometry Analysis
Published on: December 9, 2022
