Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 156, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2021.105173
Keywords
Sludge; Manganese ferrite; Hydrothermal reaction; Magnetic composites; Lead
Funding
- National Natural Science Foundation of China [51979104]
- Science and Technology Planning Project of Changsha [kq1802010]
- Forestry Science and Technology Planning Project of Hunan Province [XLK201938]
- Science and Technology Planning Project of Hunan Province [2018RS3109]
- Natural Science Foundation of Hunan Province, China [2020JJ5019]
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The magnetic MnFe2O4-sludge biochar composites synthesized via a one-step hydrothermal approach exhibit high adsorption efficiency for removing Pb2+ from water bodies, showing great potential for practical applications.
The magnetic MnFe2O4-sludge biochar composites (MFSB) was synthesized in one-step hydrothermal approach, realizing hydrothermal carbonization of sludge and preparation of MnFe2O4 simultaneously. The characterizations of prepared adsorbents indicated that the combination of hydrothermal sludge biochar and MnFe2O4 enhanced the structure of the hydrothermal sludge, prevented the agglomeration of MnFe2O4, and endowed the composites with magnetism and higher specific surface area. Batch adsorption experiments showed higher adsorption efficiency of MnFe2O4-sludge biochar composites with sludge content of 1.5 g (MFSB-1.5) to Pb2+. In the Pb2+ adsorption process on MFSB-1.5, the better fit of Pseudo-second-order model and the Langmuir isotherm was demonstrated, with a maximum adsorption amount of 174.216 mg/g at the reaction temperature of 25 celcius. Based on adsorption mechanism analysis, the Pb2+ adsorption onto MFSB-1.5 mainly resulted from physical adsorption, electrostatic attraction, co-precipitation, and complexation. Due to simple operation, strong adsorption capacity, effortless magnetic separation, and sludge resource utilization, MFSB-1.5 composites have great potential in removing Pb2+ from the water body.
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