Journal
MATERIALS
Volume 14, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ma14071776
Keywords
biochar; adsorption; kinetic test; isotherm curves; fixed-bed test; groundwater remediation; chlorinated solvents
Categories
Funding
- Sapienza University of Rome
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This study evaluates the TCE removal performance of three different Biochars, with PWBC demonstrating the best performance. The continuous testing confirms the results of batch studies, providing a reference for the materials' practical applications.
Nowadays porous materials from organic waste, i.e., Biochar (BC), are receiving increased attention for environmental applications. This study adds information on three BCs that have undergone a number of studies in recent years. A Biochar from pine wood, one from rice husk and one from Eupatorium shrubs enriched with Iron, labelled as PWBC, RHBC and EuFeBC respectively, are evaluated for Trichloroethylene (TCE) removal from aqueous solution. Physical-chemical description is performed by SEM-EDS and BET analysis. The decrease of TCE over time follows a pseudo-second order kinetics with increased removal by the PWBC. Freundlich and Langmuir models well fit equilibrium test data. The optimized values of the maximum adsorbed amount, q(max) (mg g(-1)), follows this order 109.41 PWBC > 30.35 EuFeBC > 21.00 RHBC. Fixed-bed columns are also carried out. Best performance is again achieved by PWBC, which operates for a higher number of pore volume, followed by EuFeBC and RHBC. Continuous testing confirms batch studies and makes it possible to evaluate the workability of materials in configurations closer to reality. Results are promising for potential environmental application. In particular, the characterization of several classes of contaminants opens the doors to possible uses in mixed contamination cases.
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