期刊
CHEMICAL ENGINEERING JOURNAL
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124465
关键词
Water treatment; Adsorption mechanism; Heavy metal removal; Designer biochars
资金
- National Key Research and Development Program of China [2018YFC1800304, 2018YFC1802803, 2017YFD0801302]
- National Natural Science Foundation of China [21677041, 51908136, 21876027]
- Science and Technology Project of Guangzhou City [2016201604030017]
- Natural Science and Technology Project of Guangdong Province, China [2017B020216002, 2017A030311019, 2016A030313697]
In this study, a pristine biochar (BC) and Fe-Mn binary oxide-biochar (FMBC) were prepared using Pennisetum sp. straw as the feedstock for Cd(II) removal from aqueous solutions. Scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and specific surface area (SSA) analyses revealed the physico-chemical characteristics of the pristine and designer adsorbents, suggesting that an ultrasonic treatment during synthesis enhanced the SSA and pore volume of the BC, and assisted successful loading of Fe-Mn binary oxide particles on the BC surface. The Cd(II) adsorption data of the adsorbents were fitted to the Langmuir isothermal and pseudo-second-order kinetic models. At a system temperature of 25 degrees C and pH 5, the maximum Cd(II) adsorption capacities of BC (30.58 mg/g) and FMBC (95.23 mg/g) were obtained. Multiple Cd(II) adsorption mechanisms by FMBC were identified, including precipitation with minerals, complexation with surface functional groups, Cd(II)-pi interactions, and cation exchange. As the most dominant adsorption mechanism, CdO bonds were formed on the FMBC surfaces precipitating Cd(OH)(2) (63.9 wt%) and CdO (36.1 wt%). The FMBC thus could be potentially used as an effective adsorbent for Cd(II) removal from aqueous solutions.
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