Abstract
The adsorption mechanism of Cd (II) was investigated by Pennisetum sp. straw biochars (JBC) that were modified by two different methods: KMnO4 impregnation (JMB1) and H2O2 impregnation (JMB2). A scanning electron microscope and energy-dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), a Fourier transform infrared spectrometer (FTIR), and a Brunauer-Emmett-Teller (BET) specific surface area analysis were employed to examine the physicochemical characteristics of biochars. The Cd(II) adsorption kinetic fit, the Langmuir model well, and the maximum adsorption capacity occurred in the following order: JMB1 (90.32 mg/g) > JMB2 (45.18 mg/g) > JBC (41.79 mg/g), suggesting that JMB1 had an excellent adsorption performance. Finally, X-ray photoelectron spectroscopy (XPS) was used to explore the main adsorption mechanism. Our results showed that JMB1 was an excellent adsorbent in removing Cd(II) from aqueous solution.
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Funding
This work was financially supported by the National Natural Science Foundation of China (21677041, 41371317), the Science and Technology Project of Guangzhou (201604030017, 201604020077), and the Science and Technology Project of Guangdong Province (2016A04040311).
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Fig. S1
EDS spectrum with the element ratio: (a) pristine biochar (JBC), (b) KMnO4-impregnated Biochar (JMB1) and (c) H2O2-impregnated Biochar (JMB2). (PDF 2571 kb)
Fig. S2
N2 adsorption-desorption isotherms and pore size distribution of JBC (a, d), JMB1 (b, e) and JMB2 (c, f). (PDF 4740 kb)
Fig. S3
X-ray diffraction pattern of JBC, JMB1, JMB2. Crystallites were detected with peaks labeled G for graphite. (PDF 1262 kb)
Fig. S4
Zeta potentials of JBC (a), JMB1(b) and JMB2 (c) at various pH values. (PDF 177 kb)
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Yin, G., Bi, L., Song, X. et al. Adsorption of Cd(II) from aqueous solution by Pennisetum sp. straw biochars derived from different modification methods. Environ Sci Pollut Res 26, 7024–7032 (2019). https://doi.org/10.1007/s11356-019-04158-6
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DOI: https://doi.org/10.1007/s11356-019-04158-6