کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4996661 | 1459897 | 2018 | 10 صفحه PDF | دانلود رایگان |
- The hydrochar was synthesized and modified with PEI via ether and imine bonds formed.
- The adsorption characteristics of Ni and Cr for all hydrochars were different.
- Nitrogen-containing groups seems to be the main adsorption sites for both Cr and Ni.
- Oxygen-containing groups seems to be involved in the adsorption of Ni, but not in Cr.
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) (33.663Â mg/g) and Ni(II) (29.059Â mg/g) on the modified hydrochars were 365% and 43.7% higher, respectively, than those on the unmodified hydrochar. A pseudo-second-order 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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Journal: Bioresource Technology - Volume 247, January 2018, Pages 370-379