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Leonardite powder as an efficient adsorbent for cationic and anionic dyes
Hudaverdi Arslan1, Mohammed Saleh2, Zeynep Bilici1
1Department of Environmental Engineering, Mersin University, Mersin, Turkey.
Summary
Leonardite powder effectively removes Basic Red 18 (BR18) dye with 100% efficiency and Reactive Red 180 (RR180) dye with 74% efficiency. Leonardite powder shows higher uptake and reusability for BR18 compared to RR180.
Area of Science:
- Environmental Chemistry
- Materials Science
- Adsorption Science
Background:
- Textile industry wastewater often contains persistent synthetic dyes like Basic Red 18 (BR18) and Reactive Red 180 (RR180).
- Effective removal of these dyes is crucial to prevent environmental pollution and protect aquatic ecosystems.
- Leonardite powder (LP) is a naturally occurring humic substance with potential adsorbent properties.
Purpose of the Study:
- To investigate the efficacy of leonardite powder (LP) as an adsorbent for removing BR18 and RR180 dyes from aqueous solutions.
- To characterize LP and determine the optimal conditions for dye adsorption.
- To evaluate the adsorption kinetics, isotherms, and reusability of LP for both dyes.
Main Methods:
- LP characterization using SEM, EDX, Zeta potential, BET, FTIR, and XRF.
- Batch adsorption experiments to assess the impact of pH, particle size, adsorbent dose, and initial dye concentration.
- Kinetic and isotherm modeling (pseudo-second-order, Temkin, Freundlich).
- Reusability tests over multiple adsorption-desorption cycles.
Main Results:
- LP demonstrated high adsorption capacity, achieving 100% removal of BR18 and 74% removal of RR180 under optimal conditions.
- Optimal conditions included pH 6.5, 45 μm particle size, 0.25 g/L adsorbent dose for BR18, and 1 g/L for RR180.
- Adsorption followed pseudo-second-order kinetics; BR18 adsorption fitted the Temkin isotherm, while RR180 fitted the Freundlich isotherm.
- LP showed good reusability for BR18 (96% after 2nd cycle, 42% after 5th cycle), but limited reusability for RR180.
Conclusions:
- Leonardite powder is a promising, cost-effective adsorbent for removing BR18 and RR180 dyes from wastewater.
- LP exhibits superior performance in terms of dye uptake and reusability for BR18 compared to RR180.
- Further research could explore modifications to enhance LP's reusability for RR180 and its application in real wastewater treatment.
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