PMID- 35516273
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 2046-2069 (Electronic)
IS  - 2046-2069 (Linking)
VI  - 10
IP  - 73
DP  - 2020 Dec 17
TI  - Attenuation of Cr/Pb in bauxite leachates by bentonite-polymer composite 
      geosynthetic clay liners.
PG  - 44672-44678
LID - 10.1039/d0ra06921c [doi]
AB  - Three commercially available bentonite-polymer composite geosynthetic clay liners 
      (BPC GCLs) were selected for hydraulic conductivity testing, respectively 
      permeated by two types of bauxite leachates with high alkalinity (pH > 12) and 
      high ionic strength (620.3 mM). The influence of BPC GCLs on the attenuation 
      behavior of Cr/Pb in the bauxite leachates was analyzed. The BPC GCLs with a low 
      hydraulic conductivity (k < 10(-10) m s(-1)) retard the migration of Cr and Pb 
      and the Cr had a higher mobility than Pb in the BPC GCLs. Scanning electron 
      microscope (SEM) microstructure analysis showed that the migration and 
      attenuation behavior of Cr/Pb mainly depended on the chemical properties of the 
      leachates, polymer content and the microstructure of the polymer. Higher 
      attenuation of heavy metals was obtained with bauxite leachates having higher 
      ionic strength. Sufficient polymer content is needed to ensure BPC GCLs have 
      adequately low hydraulic conductivity to suppress attenuation of heavy metals. 
      The gelatinous structure associated with hydrated linear or crosslinked polymer 
      diminishes when the polymer in a BPC is in contact with bauxite leachates. 
      Compromising the hydrogel structure promotes polymer elution and leaves pore 
      space open, resulting in attenuation of heavy metals.
CI  - This journal is (c) The Royal Society of Chemistry.
FAU - Li, Qin
AU  - Li Q
AUID- ORCID: 0000-0001-8665-9356
AD  - School of Geosciences and Environmental Engineering, Southwest Jiaotong 
      University Chengdu China pdp0330@swjtu.cn.
FAU - Peng, Daoping
AU  - Peng D
AD  - School of Geosciences and Environmental Engineering, Southwest Jiaotong 
      University Chengdu China pdp0330@swjtu.cn.
FAU - Wu, Zheng
AU  - Wu Z
AD  - School of Geosciences and Environmental Engineering, Southwest Jiaotong 
      University Chengdu China pdp0330@swjtu.cn.
FAU - Huang, Tao
AU  - Huang T
AD  - School of Geosciences and Environmental Engineering, Southwest Jiaotong 
      University Chengdu China pdp0330@swjtu.cn.
LA  - eng
PT  - Journal Article
DEP - 20201217
PL  - England
TA  - RSC Adv
JT  - RSC advances
JID - 101581657
PMC - PMC9058447
COIS- There are no conflicts to declare.
EDAT- 2020/12/17 00:00
MHDA- 2020/12/17 00:01
PMCR- 2020/12/17
CRDT- 2022/05/06 05:41
PHST- 2020/08/13 00:00 [received]
PHST- 2020/12/03 00:00 [accepted]
PHST- 2022/05/06 05:41 [entrez]
PHST- 2020/12/17 00:00 [pubmed]
PHST- 2020/12/17 00:01 [medline]
PHST- 2020/12/17 00:00 [pmc-release]
AID - d0ra06921c [pii]
AID - 10.1039/d0ra06921c [doi]
PST - epublish
SO  - RSC Adv. 2020 Dec 17;10(73):44672-44678. doi: 10.1039/d0ra06921c. eCollection 
      2020 Dec 17.