Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 7, Pages 6565-6575Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-04095-w
Keywords
Biochar; Phosphate adsorption; Eutrophication; Recycling; Restored manganese mine land
Categories
Funding
- China Postdoctoral Science Foundation [2017M610513]
- National Natural Science Foundation of China [51608208]
- Major Science and Technology Program of Hunan Province [2017NK1010]
- Natural Science Foundation of Hunan Province [2018JJ3887, 2018JJ3096]
- Research Foundation of Education Department of Hunan Province, China [17K105]
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In this study, Broussonetia papyrifera leaves collected from land near a restored manganese mine in the Hunan Province of China were converted into biochar under high-temperature anaerobic conditions, regeneration and utilization of agricultural and forest waste, and applied to the prevention of eutrophication. The physicochemical properties of the B. papyrifera biochar were characterized using Micromeritics 3Flex analyzer, scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), thermogravimetric analyzer (TGA), X-ray photoelectron spectrometer (XPS), zeta potential meter (zeta), and X-ray diffraction (XRD). The effects of pH, ionic strength, coexisting ions, time, initial concentration, and temperature on the decontamination process of phosphate in water were studied. The results indicated that adsorption was enhanced under alkaline conditions. The pseudo-second-order model of adsorption kinetics was applied to illustrate the adsorption processes. The chemical adsorption reaction was the main rate-limiting step in the adsorption process. Isotherm experimental data were best fitted by the Freundlich model at 25 degrees C and by the Langmuir model at 35 degrees C. The phosphate combined with B. papyrifera biochar mainly in the forms of exchangeable phosphorus (Ex-P), Al-bound phosphorus (Al-P), and Fe-bound phosphorus (Fe-P). These results indicate that B. papyrifera biochar is a suitable candidate for the treatment of a eutrophic body of water.
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