Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 31, Number 3, November10 2022 , pages 281-289 DOI: https://doi.org/10.12989/gae.2022.31.3.281 |
|
|
|
Characteristics of soybean urease induced CaCO3 precipitation |
||
Liping Zhu, Chaopeng Lang, Bingyan Li, Kejun Wen and Mingdong Li
|
||
| Abstract | ||
| Bio-CaCO3 is a blowout environment-friendly materials for soil improvement and sealing of rock fissures. To evaluate the chemical characteristics, shape, size and productivity of soybean urease induced CaCO3 precipitates (SUICP), experimental studies were conducted via EDS, XRD, FT-IR, TGA, BET, and SEM. Also, the conversion rate of SUICP reaction at different time were determined and analyzed. The Bio-CaCO3 product obtained by SUICP is comprehensively judged as calcite based on the results of EDS, XRD and FT-IR. The SUICP calcite precipitates are detected as spherical or ellipsoidal particles 3-6 um in diameter with nanoscale pores on their surface, and this morphology is novel. The median secondary particle size d50 is 39-88 um, indicating the agglomeration of the primary calcite particles. The Bio-calcite decomposes at 650-780C, representing a medium thermal stability. The conversion rate of SUICP reaction can reach 80% in 24h, which is much more efficient than microbially induced CaCO3 precipitation. These results reveal the knowledges of SUICP, and further direct its engineering applications. Moreover, we show an economic channel to obtain porous spherical calcite. | ||
| Key Words | ||
| CaCO3; calcite; calcium carbonate; EICP; MICP; morphology; urease | ||
| Address | ||
| Liping Zhu: School of Water Resources and Environmental Engineering, East China University oftechnology, Nanchang, 330013, China; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China Chaopeng Lang: Chongqing Wanzhou District Housing Management Center, Chongqing, 404000,China Bingyan Li and Mingdong Li: School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China Kejun Wen: Department of Civil and Environmental Engineering, Jackson State University, Jackson, MS 39217, USA | ||