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Removal of cationic dyes from aqueous solution using polyacrylic acid modified hemp stem
Wentao Huang1, Yuping Xu1, Niansheng Chen1
1Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), 68 Jincheng Street, East Lake High-tech Development Zone, Wuhan, 430078, China.
Environmental Science and Pollution Research International
|December 21, 2023
Summary
A novel bioadsorbent, hemp stem-grafted polyacrylic acid (HS-PAANa), efficiently removes cationic dyes from wastewater. This sustainable material demonstrates high adsorption capacity and recyclability for effective dye pollutant treatment.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Dye pollution from industrial wastewater poses significant environmental challenges due to the persistence and recalcitrance of dyes.
- Conventional methods for dye removal often face limitations in efficiency, cost, and environmental impact.
Purpose of the Study:
- To synthesize and characterize a novel anionic bioadsorbent (HS-PAANa) from agricultural waste (hemp stem) for efficient dye removal.
- To evaluate the adsorption performance, kinetics, and selectivity of HS-PAANa for cationic dyes.
- To assess the recyclability and practical applicability of the developed bioadsorbent in wastewater treatment.
Main Methods:
- Synthesis of HS-PAANa by grafting polyacrylic acid (PAA) onto hemp stem (HS).
- Adsorption experiments using cationic dyes (methylene blue and crystal violet) and anionic dyes (methyl orange).
- Kinetic and isotherm modeling (pseudo-second-order and Langmuir models) to understand adsorption mechanisms.
- Evaluation of selective adsorption in binary dye systems and assessment of adsorbent recyclability over multiple cycles.
Main Results:
- HS-PAANa demonstrated rapid adsorption kinetics and high adsorption capacities for methylene blue (1296.65 mg/g) and crystal violet (1451.43 mg/g).
- Adsorption data best fit the pseudo-second-order kinetic model and Langmuir isotherm.
- The adsorbent showed selective adsorption for cationic dyes in a binary dye system (MB/MO).
- HS-PAANa maintained high removal efficiencies (>93%) after five adsorption-desorption cycles, indicating excellent recyclability.
Conclusions:
- The synthesized HS-PAANa is a highly efficient and selective bioadsorbent for removing cationic dyes from aqueous solutions.
- Its derivation from agricultural waste and excellent recyclability highlight its potential as a sustainable and cost-effective solution for industrial wastewater treatment.
- HS-PAANa shows promise for targeted removal of specific dye pollutants from complex mixtures.
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