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Efficient removal of cationic dye mixtures from water using a bio-composite adsorbent optimized with response surface
Swastika Choudhury1, Samit Kumar Ray1
1Department of Polymer Science and Technology, University of Calcutta, 92, A.P.C. Road, Kolkata, 700009, India.
Carbohydrate Polymers
|September 5, 2018
Summary
A novel bio-composite adsorbent made from kappa-carrageenan and poly (N-vinylpyrrolidone-co-acrylic acid) effectively removes cationic dyes from water. This functional adsorbent shows high capacity for Safranine T and brilliant cresyl blue removal.
Area of Science:
- Materials Science
- Environmental Chemistry
- Polymer Science
Background:
- Wastewater contamination by cationic dyes poses environmental challenges.
- Development of efficient and sustainable adsorbents is crucial for dye removal.
- Bio-composites offer promising alternatives due to their tunable properties and eco-friendliness.
Purpose of the Study:
- To synthesize and characterize a novel bio-composite adsorbent integrating kappa-carrageenan (KC) and poly (N-vinylpyrrolidone-co-acrylic acid) (CP).
- To evaluate the adsorbent's efficiency in removing Safranine T (ST) and brilliant cresyl blue (BCB) cationic dyes from aqueous solutions.
- To optimize synthesis and adsorption process parameters using response surface methodology.
Main Methods:
- Free radical polymerization of N-vinylpyrrolidone (NVP) and acrylic acid (AA) in the presence of KC and methylene bis-acrylamide (MBA) crosslinker.
- Characterization of the synthesized CPKC bio-composite adsorbent.
- Adsorption studies for binary mixtures of ST and BCB.
- Optimization of adsorbent composition and process conditions using Central Composite Design (CCD) within Response Surface Methodology (RSM).
Main Results:
- The optimized CPKC bio-composite adsorbent (2.5 wt% KC, 1.5 wt% MBA, NVP:AA molar ratio 1.3:1) demonstrated high adsorption capacities.
- Specific adsorption capacities achieved were 362.5 mg/g for ST and 398 mg/g for BCB.
- Optimal adsorption occurred at pH 7 with an adsorbent dose of 0.25 g/L for a binary dye mixture (100 mg/L each).
Conclusions:
- The developed CPKC bio-composite adsorbent is highly effective for the simultaneous removal of cationic dyes from water.
- RSM optimization successfully identified key parameters for maximizing dye adsorption.
- This study presents a sustainable and efficient approach for treating dye-contaminated industrial wastewater.
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