The aim of the present study is to optimize and model the removal of Two Azo and Two Anthra-Quinone Dyes from the dye effluent using Tunic of Allium cepa derived activated carbon using RSM. The relationship between dye removal efficiency and three main independent parameters including Temperature, Solution pH and Adsorbent Dosage were evaluated by applying central composite design (CCD) and Box–Behnken design (BBD).
Water Has the high importance in industrial ad domestic areas, Where Industries consume a lot of water and releases highly toxic effluents which are really harmful to the environment containing the toxic metals like Cr, Cd, Pd, Ti, Zn and many harmful dyes etc. Textile effluent dyes are targeted I the present work which exist in two forms (i) True Color (ii) Apparent color. There are various dyes used in the textile industries among which majority of dye stuffs are majorly based on azodyes which are used to dye cotton fabric and anthra-quinone dyes.
Azo Dyes: Determination of azo dyes are categorized by the presence of (-N=N-) azo group as chromophore. Azo dyes are generally found in synthetic dye classes. Previously azo dyes were applied to cotton which involves the reactions with chemical components which reacts to form the dye into the fiber or on the surface. Primuline red and Para red fall into this group of azo dyes introduces in 1880’s.Azo dyes are mostly used in cotton fabric.
Anthra- quinone dyes: Determination of anthra- quinone dyes are characterized by carbonyl group (>C=O) as chromophore. Other names of anthra- quinone are anthrachinon, dioxoanthracene and different trade names like Corbit and Hoelite. The dyes like Saffranin, indigo carmine, Alizarin, Red S, Crystal violet were chosen here from the textile effluent for the removal.
The source materials used here are natural powders namely Tunic of Allium cepa and its activated carbon.
Table of Contents
1. INTRODUCTION
2. MATERIAL AND METHODS
Dye Effluent Collection:
Collection of Adsorbents :
Response Surface Methodology
Surface Characterization of Adsorbent:
3. RESULTS AND DISCUSSION
Characterization of Activated Carbon derived from Tunic of Allium Cepa
Optimization using Response Surface Methodology (RSM): Optimization of the selected parameters using CCD and BBD.
Interpretation of residual graphs:
Interaction effects of Adsorption variables:
4. CONCLUSION
5. REFERENCES
Research Objectives and Topics
The primary objective of this research is to optimize and model the removal of two Azo and two Anthra-quinone dyes from industrial wastewater. By utilizing activated carbon derived from the tunic of Allium cepa, the study evaluates the relationship between dye removal efficiency and three independent parameters: temperature, solution pH, and adsorbent dosage, employing Response Surface Methodology (RSM) with both Central Composite Design (CCD) and Box–Behnken design (BBD).
- Application of natural, low-cost adsorbents for wastewater treatment.
- Characterization of adsorbent surface properties using FTIR spectroscopy.
- Optimization of adsorption parameters (temperature, pH, dosage) via RSM.
- Statistical modeling of dye removal efficiency using CCD and BBD.
- Evaluation of interactive effects between adsorption variables on removal outcomes.
Excerpt from the Book
Characterization of Activated Carbon derived from Tunic of Allium Cepa
The FTIR is an important tool to identify characteristic functional groups of the Adsorbent, which are capable of adsorbing dye ions.
The FTIR spectroscopy provides structural and compositional information on the functional groups presented in the sample. The functional groups present in the Activated Carbon derived from Tunic of Allium Cepa adsorbent were investigated by FTIR spectra within the range of 500 – 4000 cm-1 wave number. Fig-3.1.1 (a), (b), (c), (d) and (e) shows IR spectra of Activated Carbon derived from Tunic of Allium Cepa adsorbent and Safranine, Indigo Caramine, Alizarin Red S and Crystal Violet loaded Activated Carbon derived from Tunic of Allium Cepa adsorbent. The band positions in the FTIR spectra of the Activated Carbon derived from Tunic of Allium cepa adsorbent before and after Safranine, Indigo Caramine, Alizarin Red S and Crystal Violet adsorption are presented in Table. 3.1.1.
Summary of Chapters
1. INTRODUCTION: This chapter provides an overview of the environmental hazards caused by textile dye effluents and outlines the research aims to model the removal of specific dyes using natural adsorbents.
2. MATERIAL AND METHODS: This section details the collection of dye effluent and natural adsorbents, as well as the experimental framework including FTIR characterization and the application of Response Surface Methodology.
3. RESULTS AND DISCUSSION: This chapter presents the FTIR spectral analysis of the adsorbent and detailed statistical optimization of adsorption parameters using CCD and BBD models alongside residual graph interpretations.
4. CONCLUSION: This chapter summarizes the study's findings, highlighting the effectiveness of the optimized conditions for maximizing dye removal using activated carbon derived from Allium cepa tunic.
5. REFERENCES: This section lists the scientific literature and previous studies cited throughout the research project.
Keywords
Adsorption, Allium cepa, Textile effluent, Azo dyes, Anthra-quinone dyes, Activated carbon, Response Surface Methodology, Central Composite Design, Box–Behnken design, Wastewater treatment, FTIR spectroscopy, Optimization, Dye removal efficiency, pH, Temperature.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the removal of hazardous textile dyes (two Azo and two Anthra-quinone) from industrial wastewater using a cost-effective, natural adsorbent derived from onion (Allium cepa) skin.
Which specific dyes were studied?
The study specifically targets Safranine, Indigo Carmine, Alizarin Red S, and Crystal Violet dyes.
What is the primary goal of the study?
The primary goal is to find the optimal operational parameters—specifically temperature, pH, and adsorbent dosage—to maximize the dye removal efficiency.
Which scientific method is utilized for optimization?
The researchers use Response Surface Methodology (RSM), specifically employing Central Composite Design (CCD) and Box–Behnken design (BBD) to statistically model the adsorption process.
What does the main body of the work cover?
The main body covers the physical characterization of the adsorbent via FTIR, the systematic design of experiments, statistical analysis of variance (ANOVA), and the interpretation of surface contour plots for various adsorption conditions.
Which keywords characterize this work?
Key terms include Adsorption, Allium cepa, Response Surface Methodology, Wastewater treatment, and Dye removal efficiency.
How was the Activated Carbon prepared?
The natural tunic of Allium cepa was cleaned, dried in an oven at 100 degrees Celsius, and powdered for use in the adsorption process.
What role does FTIR play in this study?
FTIR spectroscopy is used to identify the functional groups on the surface of the adsorbent that are responsible for binding with the dye ions.
What were the optimal conditions found for Safranine adsorption?
For Safranine, the predicted optimal conditions were an adsorbent dosage of 22.115 g/L, a pH of 4.1174, and a temperature of 303.8253 K.
- Citation du texte
- Dr. Meena Vangalapati (Auteur), Dr. M. Sumalatha (Auteur), Dr. L. Rama Devi (Auteur), 2016, Decolorization of Two Azo and Two Anthra- Quinone Dyes from the Dye Effluent using Tunic of Allium cepa derived activated carbon. The Response Surface Methodology, Munich, GRIN Verlag, https://www.grin.com/document/318617
