期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 49, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2022.103026
关键词
Modified; Biochar; ZVI; Adsorption; Phosphorus removal
资金
- Sichuan Science and Technology Program [2020YFG0067, 2022YFG0307, 2022NSFSC0393]
- Open Fund of State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution [GHBK-2021-004]
In this study, nitrogen-doped zero-valent iron/biochar (ZVI/BC-N) with a larger specific surface area and porous structure was successfully prepared by oxidizing waste corn cobs and grafting them with diethylenetriamine (DETA). ZVI/BC-N exhibited stronger adsorption performance in phosphorus removal, with a multimolecular layer chemisorption mechanism. This study provides a simple method for preparing biochar composites with a high ZVI content and presents a new approach for efficient removal of phosphorus from water.
In this study, waste corn cobs were oxidized and grafted with diethylenetriamine (DETA), which chelates a large amount of Fe3+. Then, nitrogen-doped zero-valent iron/biochar (ZVI/BC-N) was prepared using a simple carbothermal reduction method. ZVI/BC-N had a larger specific surface area and porous structure due to the irregular folding phenomenon on its surface caused by Fe and N codoping. At the same time, ZVI/BC-N contained more ZVI reactive crystals due to DETA chelation. The pseudo-second-order and Elovich models better describe the behavior of ZVI/BC and ZVI/BC-N in phosphorus adsorption, where the adsorption process was controlled by a combination of the reaction rate and diffusion. The isotherm and thermodynamic fitting results showed that the adsorption of phosphorus by ZVI/BC was a single-molecular-layer physical adsorption process, while ZVI/BC-N exhibited multimolecular layer chemisorption, and the maximum amounts of phosphorus adsorbed by ZVI/BC and ZVI/BC-N were 17.93 and 82.78 mg.g(-1), respectively. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy showed that both C=N and C=H on biochar were involved in the adsorption process, while the coordination between -OH, C-O and phosphate, the adsorption of ZVI and chemical processes were the main mechanisms of phosphorus removal. The stronger adsorption performance of ZVI/BC-N compared to ZVI/BC might be related to its high ZVI content and rich surface structure. This study aims to provide a method for the preparation of biochar composites with a high ZVI content through simple modifications and provide a new approach for the efficient removal of phosphorus from water.
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