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Quaternized wood as sorbent for hexavalent chromium.
1Chemistry Department, Faculty of Science and Environmental Studies, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. kslow@fsas.upm.edu.mu
Applied Biochemistry and Biotechnology
|March 22, 2001
Summary
Quaternized wood (QW) chips effectively remove hexavalent chromium from wastewater. These chips offer high sorption capacity and are suitable for both batch and continuous-flow water treatment systems.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Hexavalent chromium is a toxic heavy metal pollutant.
- Effective removal of chromium from industrial wastewater is crucial.
- Wood-based materials offer a sustainable alternative for pollutant remediation.
Purpose of the Study:
- To investigate the efficacy of quaternized wood (QW) chips for hexavalent chromium removal.
- To evaluate QW chips under batch and continuous-flow conditions.
- To compare QW chips with untreated wood chips for chromium sorption.
Main Methods:
- Sorption experiments were conducted under varying pH, metal concentration, and temperature.
- Batch and continuous-flow column studies were performed.
- Langmuir isotherm model was used to analyze equilibrium data.
Main Results:
- QW chips demonstrated higher sorption capacity and a wider effective pH range than untreated wood chips.
- Maximum sorption capacities were 27.03 mg/g (synthetic solution) and 25.77 mg/g (chrome waste).
- High sulfate concentrations inhibited chromium uptake, while bed depth significantly impacted breakthrough time in column studies.
Conclusions:
- Quaternized wood chips are a promising adsorbent for hexavalent chromium removal.
- QW chips exhibit superior performance compared to untreated wood.
- The findings support the use of QW chips in water treatment applications, particularly in continuous-flow systems.