PMID- 36187975
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20221004
IS  - 1664-302X (Print)
IS  - 1664-302X (Electronic)
IS  - 1664-302X (Linking)
VI  - 13
DP  - 2022
TI  - Catalyzing urea hydrolysis using two-step microbial-induced carbonate 
      precipitation for copper immobilization: Perspective of pH regulation.
PG  - 1001464
LID - 10.3389/fmicb.2022.1001464 [doi]
LID - 1001464
AB  - Microbial induced carbonate precipitation (MICP) has recently applied to 
      immobilize heavy metals toward preventing their threats to public health and 
      sustainable development of surrounding environments. However, for copper 
      metallurgy activities higher copper ion concentrations cause the ureolytic 
      bacteria to lose their activity, leading to some difficulty in forming carbonate 
      precipitation for copper immobilization (referred to also as 
      "biomineralization"). A series test tube experiments were conducted in the 
      present work to investigate the effects of bacterial inoculation and pH 
      conditions on the copper immobilization efficiency. The numerical simulations 
      mainly aimed to compare with the experimental results to verify its 
      applicability. The copper immobilization efficiency was attained through azurite 
      precipitation under pH in a 4-6 range, while due to Cu(2+) migration and 
      diffusion, it reduced to zero under pH below 4. In case pH fell within a 7-9 
      range, the immobilization efficiency was attained via malachite precipitation. 
      The copper-ammonia complexes formation reduced the immobilization efficiency to 
      zero. The reductions were attributed either to the low degree of urea hydrolysis 
      or to inappropriate pH conditions. The findings shed light on the necessity of 
      securing the urease activity and modifying pH conditions using the two-step 
      biomineralization approach while applying the MICP technology to remedy 
      copper-rich water bodies.
CI  - Copyright (c) 2022 Xue, Cheng, Wang and Xie.
FAU - Xue, Zhong-Fei
AU  - Xue ZF
AD  - School of Civil Engineering, Xi'an University of Architecture and Technology, 
      Xi'an, China.
AD  - Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), 
      Xi'an, China.
FAU - Cheng, Wen-Chieh
AU  - Cheng WC
AD  - School of Civil Engineering, Xi'an University of Architecture and Technology, 
      Xi'an, China.
AD  - Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), 
      Xi'an, China.
FAU - Wang, Lin
AU  - Wang L
AD  - School of Civil Engineering, Xi'an University of Architecture and Technology, 
      Xi'an, China.
AD  - Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), 
      Xi'an, China.
FAU - Xie, Yi-Xin
AU  - Xie YX
AD  - School of Civil Engineering, Xi'an University of Architecture and Technology, 
      Xi'an, China.
AD  - Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), 
      Xi'an, China.
LA  - eng
PT  - Journal Article
DEP - 20220916
PL  - Switzerland
TA  - Front Microbiol
JT  - Frontiers in microbiology
JID - 101548977
PMC - PMC9522901
OTO - NOTNLM
OT  - copper metal
OT  - copper-ammonia complex
OT  - microbial-induced carbonate precipitation
OT  - two-step biomineralization
OT  - ureolytic bacteria
COIS- The authors declare that the research was conducted in the absence of any 
      commercial or financial relationships that could be construed as a potential 
      conflict of interest.
EDAT- 2022/10/04 06:00
MHDA- 2022/10/04 06:01
PMCR- 2022/09/16
CRDT- 2022/10/03 05:01
PHST- 2022/07/23 00:00 [received]
PHST- 2022/08/29 00:00 [accepted]
PHST- 2022/10/03 05:01 [entrez]
PHST- 2022/10/04 06:00 [pubmed]
PHST- 2022/10/04 06:01 [medline]
PHST- 2022/09/16 00:00 [pmc-release]
AID - 10.3389/fmicb.2022.1001464 [doi]
PST - epublish
SO  - Front Microbiol. 2022 Sep 16;13:1001464. doi: 10.3389/fmicb.2022.1001464. 
      eCollection 2022.