Effect of TiO2-NPs on microbial-induced calcite carbonate precipitation. Issue 1 (February 2022)

• Record Type: Journal Article
• Authors: Liu, Jin-Di; Feng, Yue; Zhao, Yan-Yun; Hu, Xiang-Ming; Wu, Ming-Yue; Yu, Xiao-Xiao; Song, Chun-Yu; Zhu, Shu-Cang; Fan, Yi-Jin; Li, Wen-Qi
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 1(2022)
• Publication Date: 2022-02
• Subjects: Microbial dust suppressant -- TiO2-NPs/microbial dust suppressant -- Dust suppression effect -- Microbial-induced calcium carbonate precipitation (MICP); Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.107041
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: As a dust suppression method, microbial-induced calcium carbonate precipitation technology based on urease-producing bacteria has been widely used on roads; however, due to their low CaCO3 yield, microbial dust suppressants are not used in mining areas. To further improve the dust suppression effect of microbial dust suppressants, a TiO2 -NPs/microbial dust suppressant was developed by adding TiO2 -NPs to the microbial dust suppressant. The results showed TiO2 -NPs improved the bacteria growth and the urease activity. The best formula of microbial dust suppressant was determined to be mineralized bacteria liquid ( OD 600 = 1.7) and TiO2 -NPs 0.06 g/L. The wind erosion resistance tests showed that the dust suppression effect of the TiO2 -NPs/microbial dust suppressant was better than that of the group without TiO2 -NPs. The formation of CaCO3 was verified by Fourier-transform infrared spectrometry (FTIR), Scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS) and Transmission electron microscopy-energy-dispersive X-ray spectroscopy (TEM-EDS). X-ray diffraction (XRD) results showed that the crystal forms of the produced CaCO3 were calcite and vaterite. These results indicated that TiO2 -NPs improved the dust inhibition effect of microbial dust suppressants. Graphical Abstract: ga1 Highlights: TiO2 -NPs improved urease activity of urease-producing bacteria. TiO2 -NPs/microbial dust suppressant enhanced wind erosion resistance of coal dust. CaCO3 produced by TiO2 -NPs/microbial dust suppressant was calcite and vaterite.