Citation: Sun Mengjia, Wu Tianyi, Li Tianyu, Guo Fengqiao, Tang Yang, Mo Hengliang, Yang Zhitao, Wan Pingyu. Research on High Performance Ammonium Removal Materials Based on δ-MnO₂ Nanoplate Arrays Decorated Graphite Felt[J]. Acta Chimica Sinica, ;2018, 76(6): 467-474. doi: 10.6023/A18020069 shu

Research on High Performance Ammonium Removal Materials Based on δ-MnO₂ Nanoplate Arrays Decorated Graphite Felt

a.
Institute of Applied Electrochemistry, Beijing University of Chemical Technology, Beijing 100029
b.
Beijing OriginWater Membrane Technology Co., Ltd., Beijing 101400
c.
China Academy of Urban Planning & Design, Beijing 100044

Corresponding author: Wan Pingyu, pywan@mail.buct.edu.cn
Received Date: 10 February 2018
Available Online: 3 June 2018
Fund Project: Project supported by the National Natural Science Foundation of China (No. 21506010) and the Beijing Natural Science Foundation (No. 2182050)the Beijing Natural Science Foundation 2182050the National Natural Science Foundation of China 21506010

Figures(9)

We synthesized three kinds of MnO₂ powder with different crystalline phases including α-MnO₂ nanoflowers, β-MnO₂ nanorods and δ-MnO₂ micro-particles. The structure and morphology of prepared MnO₂ were studied by XRD (X-ray diffraction), SEM (Scanning Electron Microscope), TEM (Transmission Electron Microscope) and XPS (X-ray photoelectron spectroscopy), systematically. Adsorption process was conducted in NH₄Cl solution (40 mg·L^-1 NH₃-N) and actual water samples containing NH₄⁺, Ca²⁺, Mg²⁺, K⁺ and Na⁺, respectively. The results demonstrate that δ-MnO₂ with 7.2 Å interlayer spacing which is a little larger than the diameter of hydrated ammonium (6.62 Å) has high adsorption capacity; α-MnO₂ with[2×2] tunnel of 4.6 Å has less adsorption capacity than that of δ-MnO₂, and β-MnO₂ whose[1×1] tunnel is just 1.89 Å, barely has adsorption capacity. Then MnO₂NPs/GF (MnO₂ nanoplates decorated graphite felt) was prepared via a facile in-situ redox process. Graphite felt (GF) was immersed in KMnO₄ solution (4 g·L^-1, pH=2) at 65℃ for 5 h to get MnO₂NPs/GF. GF not only reacted as the reductant of KMnO₄, but also acted as 3D framework to support the in-situ deposited MnO₂NPs. MnO₂NPs/GF shows high adsorption capacity (15 mg·g^-1) and good selectivity (86.7%). In repetitive adsorption-desorption experiments, MnO₂NPs/GF not only exhibits good stability after 20 cycles, but also decreases the concentration of NH₃-N to as low as 1 mg·L^-1. The thermodynamics experiment demonstrates that the adsorption isotherm fit well with Langmuir isotherm, and the adsorption process corresponds to the pseudo-second-order model. The excellent performance of MnO₂NPs/GF is attributed to the following three aspects. Firstly, the 7.2 Å interlayer spacing of δ-MnO₂ is suitable for the exchange-adsorption of NH₄⁺. Secondly, the ultra-thin MnO₂ nanoplate arrays, which vertically grow on the graphite felt substrate, provide fast path and convenient interface for ion exchange. Finally, the interlaced nanoplates with self-supported structure ensure its high stability. In a conclusion, MnO₂NPs/GF has a bright future in the field of ammonium removal.
- δ-manganese dioxide nanoplates,
- removal of ammonium,
- adsorption materials,
- adsorption kinetics
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Research on High Performance Ammonium Removal Materials Based on δ-MnO₂ Nanoplate Arrays Decorated Graphite Felt