Effect of TiO2-NPs on microbial-induced calcite carbonate precipitation

被引：11
作者：
Liu, Jin-Di [1 ,2 ,3 ]
Feng, Yue [1 ,2 ,3 ]
Zhao, Yan-Yun [1 ,2 ,3 ]
Hu, Xiang-Ming [1 ,2 ,3 ]
Wu, Ming-Yue [1 ,2 ,3 ]
Yu, Xiao-Xiao [1 ,2 ,3 ]
Song, Chun-Yu [1 ,2 ,3 ]
Zhu, Shu-Cang [1 ,2 ,3 ]
Fan, Yi-Jin [1 ,2 ,3 ]
Li, Wen-Qi [1 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Safety & Environm Engn, 579 Qianwangang Rd, Qingdao 266590, Shandong, Peoples R China
[2] Shandong Univ Sci & Technol, State Key Lab Mine Lab Disaster Prevent & Control, Qingdao 266590, Shandong, Peoples R China
[3] Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Shandong, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2022年 / 10卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Microbial dust suppressant; TiO2-NPs/microbial dust suppressant; Dust suppression effect; Microbial-induced calcium carbonate precipitation (MICP); TITANIUM-DIOXIDE; UREASE; NANOPARTICLES; MINERALIZATION; SUPPRESSION; PERFORMANCE; GROWTH; MICP; SOIL;
D O I：
10.1016/j.jece.2021.107041
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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 (OD600 = 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). Xray 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.
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页数：10
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