# Phosphate and ammonium adsorption of sesame straw biochars produced at different pyrolysis temperatures

Phosphate and ammonium adsorption of sesame straw biochars produced at different pyrolysis... The adsorption of N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ and PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ by sesame straw biochars (C-300, C-500, and C-700) prepared under different temperatures (300, 500, and 700 °C) was investigated in this study. The physicochemical properties of the biochars were characterized using Brunauer–Emmett–Teller method, X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectrometry. In batch experiments, C-300 showed the best N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption capacity of 3.45 mg/g because of its abundant surface functional groups at low pyrolysis temperature. C-700 achieved the optimal PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption capacity of 34.17 mg/g because of its high Ca, Mg, and Al contents and high surface area at high pyrolysis temperature. The isothermal study showed that the Langmuir–Freundlich model could sufficiently describe the N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ and PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption values, indicating the multiple adsorption processes of nutrients on biochars. The maximum N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption capacity was 93.61 mg/g on C-300, whereas the maximum PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption capacity was as high as 116.58 mg/g on C-700. Kinetic study showed that N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption on C-300 was mainly controlled by intraparticle diffusion, and the pseudo-second-order model could well describe PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption on C-700. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Science and Pollution Research Springer Journals

# Phosphate and ammonium adsorption of sesame straw biochars produced at different pyrolysis temperatures

, Volume 25 (5) – Nov 27, 2017
10 pages

Publisher
Springer Berlin Heidelberg
Subject
Environment; Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
ISSN
0944-1344
eISSN
1614-7499
D.O.I.
10.1007/s11356-017-0778-4
Publisher site
See Article on Publisher Site

### Abstract

The adsorption of N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ and PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ by sesame straw biochars (C-300, C-500, and C-700) prepared under different temperatures (300, 500, and 700 °C) was investigated in this study. The physicochemical properties of the biochars were characterized using Brunauer–Emmett–Teller method, X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectrometry. In batch experiments, C-300 showed the best N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption capacity of 3.45 mg/g because of its abundant surface functional groups at low pyrolysis temperature. C-700 achieved the optimal PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption capacity of 34.17 mg/g because of its high Ca, Mg, and Al contents and high surface area at high pyrolysis temperature. The isothermal study showed that the Langmuir–Freundlich model could sufficiently describe the N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ and PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption values, indicating the multiple adsorption processes of nutrients on biochars. The maximum N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption capacity was 93.61 mg/g on C-300, whereas the maximum PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption capacity was as high as 116.58 mg/g on C-700. Kinetic study showed that N H 4 + $$\mathrm{N}{\mathrm{H}}_4^{+}$$ adsorption on C-300 was mainly controlled by intraparticle diffusion, and the pseudo-second-order model could well describe PO 4 3 − $${\mathrm{PO}}_4^{3-}$$ adsorption on C-700.

### Journal

Environmental Science and Pollution ResearchSpringer Journals

Published: Nov 27, 2017

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