期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 245, 期 -, 页码 447-453出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2019.05.091
关键词
Nickel ions; Electroplating wastewater; Bacillus subtilis; Phosphate ions; Nickel phosphate octahydrate
资金
- China Postdoctoral Science Foundation [2019M650715]
- National Nature Science Foundation of China [51702238]
- Opening Funds of Jiangsu Key Laboratory of Construction Materials [CM2018-02]
Nickel ions in electroplating wastewater can be removed by the bio-mineralization method. Bacillus subtilis can produce alkaline phosphatase, which hydrolyzes organophosphate monoesters and produces phosphate ions. Fourier-transform infrared spectroscopy (FTIR) showed that the precipitated material contains phosphate ions. X-ray diffraction (XRD) showed that nickel ions in electroplating wastewater react with Bacillus subtilis and organophosphate monoesters to obtain nickel phosphate octahydrate (Ni-3(PO4)(2)center dot 8H(2)O). The removal efficiency of nickel ions could reach 76.41% with the optimum content of the organophosphate monoester (0.02 mol), Bacillus subtilis powder (2 g), pH (6), standing time (36 h), and reaction temperature (25 degrees C) in the medium solution (100 mL). The average particle size of Ni-3(PO4)(2)center dot 8H(2)O was 80.51 nm, which was calculated by the Scherrer formula. The Lorentz-Transmission Electron Microscope (L-TEM) further showed that Ni-3(PO4)(2)center dot 8H(2)O was composed of clusters of irregular nanoparticles, and the individual particle size was in the range of 40-90 nm. The TGA curve shows that the mass loss of crystal water was 25.45%, which was close to the theoretical total mass loss of 28.24% in bio-Ni-3(PO4)(2)center dot 8H(2)O.
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