Journal
DIAMOND AND RELATED MATERIALS
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108795
Keywords
Magnetic biochar; Tea residues; KOH; Methylene blue
Categories
Funding
- National Natural Science Foundation of China [52000149]
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By increasing the mesoporous volume and stability, tea-based biochar showed improved adsorption and separation efficiency for dye wastewater treatment. The prepared magnetic biochar by KOH activation exhibited significantly higher sorption capacity and good magnetic properties. The results indicate that tea residue-based biochar has considerable potential for application in printing and dyeing wastewater remediation.
To improve both adsorption and separation efficiency by increasing the mesoporous volume and stability of tea-based biochar for dye wastewater treatment, the magnetic biochar by KOH activation (MBCK), was prepared by slow pyrolysis of tea residues powder with FeCl3 solution impregnation in various ratios. The specific surface area of MBCK0.5 enhanced significantly to 409.15 m(2)/g with a 3-fold increase in mesopore pore volume and good magnetic properties. Using methylene blue (MB) as the dye model, a sorption capacity as high as 394.30 mg/g of 1 g/L MBCK0.5 toward 500 mg/L MB was observed in 360 min at 25 degrees C and pH 10.0, significantly higher than un-activated biochar MBCK0. After 5 cycles, MBCK0.5 still exhibited excellent adsorption capacity (82.81 mg/g), due to the main interactions of pore filling, hydrogen bonding, pi-pi interactions and electrostatic attraction. Experimental data are more consistent with the Dubinin-Radushkevich isotherm and the pseudo-second-order kinetics models. These results indicated that tea residue-based biochar has considerable scope for application in printing and dyeing wastewater remediation.
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