Journal
BIORESOURCE TECHNOLOGY
Volume 247, Issue -, Pages 370-379Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.09.107
Keywords
Hydrochar; Chromium; Nickel; Polyethylene imine; Adsorption
Funding
- National Natural Science Foundation of China [31401944]
- National Key Technology Research and Development Program of China [2017YFD0800202, 2016YFD0501404-6]
- China Agricultural University Education Foundation Da Bei Nong Group Education Foundation [1031-2415005]
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An adsorbent hydrochar was synthesized from corn cobs and modified with polyethylene imine (PEI). The hydrochars before and after modification were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis. FTIR and XPS revealed that the PEI was grafted onto the hydrochar via ether and imine bonds formed with glutaraldehyde. The maximum adsorption capacities for Cr(VI) (33.663 mg/g) and Ni(II) (29.059 mg/g) on the modified hydrochars were 365% and 43.7% higher, respectively, than those on the unmodified hydrochar. A pseudo-secondorder model described the adsorption of Ni(II) and Cr(VI) on all the adsorbents. The adsorption of Cr(VI) was endothermic, spontaneous, increased disorder, and obeyed the Langmuir model. By contrast, the adsorption of Ni(II) was exothermic, spontaneous, decreased disorder, and obeyed the Freundlich model. XPS confirmed that the adsorption sites and mechanisms for Ni(II) and Cr(VI) on the modified hydrochars were different.
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