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- Title
A novel superparamagnetic micro-nano-bio-adsorbent PDA/Fe<sub>3</sub>O<sub>4</sub>/BC for removal of hexavalent chromium ions from simulated and electroplating wastewater.
- Authors
Li, Lincheng; Zhong, Dengjie; Xu, Yunlan; Zhong, Nianbing
- Abstract
In order to improve the adsorption efficiency of the adsorbent and solve the problem of separation difficulty, a novel superparamagnetic micro-nano-bio-adsorbent (PDA/Fe3O4/BC) was prepared by in situ self-assembly of polydopamine (PDA). The results of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and vibrating sample magnetometer (VSM) characterization showed that the size of bio-adsorbent was about 200 nm. PDA and Fe3O4 modifications increased the specific surface area of adsorbent, changed the surface functional group of biochar (BC), and made the adsorbent have super-high magnetization (294.76 emu g−1). PDA/Fe3O4/BC was applied to treat Cr wastewater. The results show that the adsorption of Cr by PDA/Fe3O4/BC includes single-layer and multilayer adsorption. The adsorption follows the pseudo-second-order kinetic model. The adsorption is spontaneous and endothermic, and its maximum adsorption capacity and activation energy are 25.25 mg g−1 at 318 K and 23.108 kJ mol−1, respectively. After adsorption treatment, PDA/Fe3O4/BC still possesses high magnetization (233.04 emu g−1). PDA/Fe3O4/BC can treat actual electroplating wastewater with Cr(VI) concentration from 20 mg L−1 to less than 0.2 mg L−1, which met the PRC discharge standard (GB/21900-2008) of electroplating pollutants.
- Subjects
CHROMIUM ions; SUPERPARAMAGNETIC materials; HEXAVALENT chromium; FOURIER transform spectrometers; SCANNING electron microscopes; ADSORPTION capacity; X-ray spectrometers
- Publication
Environmental Science & Pollution Research, 2019, Vol 26, Issue 23, p23981
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-019-05674-1