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Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis
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Sorption studies of Cr(VI) from aqueous solution using bio-char as an adsorbent
A H M G Hyder1, Shamim A Begum2, Nosa O Egiebor2
1Department of Land and Water Resources Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden.
Summary
Wood-derived biochar effectively removes hexavalent chromium (Cr(VI)) from wastewater. This low-cost adsorbent shows high efficiency, especially at low pH, offering a sustainable solution for water treatment.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment Technologies
Background:
- Hexavalent chromium (Cr(VI)) is a toxic pollutant in industrial wastewater.
- Conventional treatment methods can be costly and generate secondary waste.
- Biochar, a byproduct of biomass gasification, is explored as a sustainable adsorbent.
Purpose of the Study:
- To evaluate the sorption characteristics of wood-derived biochar for Cr(VI) removal.
- To determine the influence of pH, initial Cr(VI) concentration, and biochar dosage.
- To investigate the sorption kinetics and equilibrium of the Cr(VI)-biochar interaction.
Main Methods:
- Batch tests were conducted using synthetic wastewater spiked with Cr(VI).
- Variables included pH (ranging from 2), initial Cr(VI) concentrations (10-500 mg/L), and biochar dosage.
- Sorption kinetics and isotherms were analyzed using second-order kinetic and Langmuir models.
Main Results:
- Nearly 100% Cr(VI) removal was achieved at pH 2 with 10 mg/L initial concentration using 4 g biochar within 5 hours.
- Maximum sorption capacity reached 1.717 mg/g at 500 mg/L initial Cr(VI) concentration after 5 hours.
- Sorption kinetics followed a second-order model, and the Langmuir isotherm best described the sorption process.
Conclusions:
- Wood-derived biochar is a cost-effective and efficient adsorbent for removing Cr(VI) from aqueous solutions.
- Optimal removal occurs at acidic pH (pH 2).
- Findings support the use of biochar in filtration units for large-scale water and wastewater treatment.
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