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- Title
Enhanced removal of Cr(VI) by polyethyleneimine-modified bamboo hydrochar.
- Authors
Chen, Zi-Le; Zhang, Yu-Nan; Guo, Jian-Zhong; Chen, Lin; Li, Bing
- Abstract
Hydrochar is an environmentally friendly and cheap adsorbent, but its adsorption amounts for anions is very limited. The functionalized hydrochar can overcome this shortcoming. Herein, polyethyleneimine-modified hydrochar (PEI-HC) was synthesized from hydrothermal carbonization (HTC) of methyl acrylate and bamboo after addition of initiator ammonium persulfate, and then modified by polyethyleneimine (PEI), which was used to treat Cr(VI). PEI-HC was tested by XANES, EXAFS, SEM-EDS, XPS, FTIR, N2 sorption isotherms, zeta potential, and elemental analyses. The characterizations showed that PEI was successfully grafted onto hydrochar, and the PEI-HC was rich in N and O functional groups, which presented high Cr(VI) sorption ability (528.41 mg·g−1 at pH 2). The bath experiments found the pseudo-second-order kinetic and Freundlich equations can well describe the adsorption kinetics and isotherm of the Cr(VI) adsorption onto PEI-HC, respectively. Electrostatic interaction, reduction, complexation, and H-bonding are the main removal mechanisms as supported by XANES, EXAFS, XPS, and FTIR. This study provides a strategy of combining HTC and free radical graft polymerization to convert agricultural and forestry wastes into functionalized hydrochar, showing highly efficient removal of Cr(VI).
- Subjects
HYDROTHERMAL carbonization; ADSORPTION kinetics; AGRICULTURAL wastes; ADSORPTION isotherms; DISTRIBUTION isotherms (Chromatography); BAMBOO
- Publication
Environmental Science & Pollution Research, 2023, Vol 30, Issue 41, p94185
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-023-29085-5