PMID- 38075759
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20231211
IS  - 2470-1343 (Electronic)
IS  - 2470-1343 (Linking)
VI  - 8
IP  - 48
DP  - 2023 Dec 5
TI  - Geopolymer Foam Reinforced with Iron Ore Flotation Tailing for Potassium 
      Adsorption and Controlled Release in Water.
PG  - 45735-45749
LID - 10.1021/acsomega.3c06238 [doi]
AB  - A geopolymer foam was synthesized for the evaluation of its capacity for fast 
      retention and slow release of potassium in water. The base matrix of the 
      geopolymer binder was obtained by mixing metakaolin, sodium silicate, and sodium 
      hydroxide solutions. A factorial design of experiments (DOE) was applied to 
      analyze the effect of adding hydrogen peroxide, aluminum powder, soybean oil, and 
      iron ore flotation tailing on the water absorption and compressive strength of 
      the geopolymer samples. The best-performing samples were characterized and 
      evaluated for morphological aspects, chemical stability in different pH ranges, 
      optimal adsorption time, and the ability to release potassium in the water. The 
      inclusion of hydrogen peroxide was not a statistically significant factor at the 
      95% confidence level. The inclusion of aluminum powder and oil increased the 
      water absorption, whereas the addition of tailing decreased it. The addition of 
      soybean oil and tailing contributed positively to the compressive strength, but 
      the addition of aluminum powder caused its reduction. The tailing addition not 
      only increased the porous samples compressive strength but also prevented large 
      cracks in their structure. The optimized response of 63 wt % of water absorption 
      and 6 MPa of compressive strength was achieved by adding 0.05% of Al-powder, 1.5% 
      of soybean oil, and 20% of tailing on the geopolymer binder. This sample 
      exhibited 72% open porosity, a maximum adsorptive capacity of q = 5.7 mg/g, and 
      chemical stability at pH > 4. Adsorption stabilized after 9 h of contact with 
      water. Kinetics modeling suggested that the concentration gradient and chemical 
      reactions probably drove potassium adsorption. The potassium release step was 
      possibly controlled by the concentration gradient. After 60 days, the water 
      solution released only 28% of absorbed potassium.
CI  - (c) 2023 The Authors. Published by American Chemical Society.
FAU - Pereira, Yara Sena
AU  - Pereira YS
AUID- ORCID: 0000-0001-6339-6960
AD  - Centro de Desenvolvimento da Tecnologia Nuclear - CDTN, Belo Horizonte 31270-901, 
      MG, Brazil.
FAU - Lameiras, Fernando Soares
AU  - Lameiras FS
AD  - Centro de Desenvolvimento da Tecnologia Nuclear - CDTN, Belo Horizonte 31270-901, 
      MG, Brazil.
FAU - Dos Santos, Ana Maria Matildes
AU  - Dos Santos AMM
AD  - Centro de Desenvolvimento da Tecnologia Nuclear - CDTN, Belo Horizonte 31270-901, 
      MG, Brazil.
LA  - eng
PT  - Journal Article
DEP - 20231124
PL  - United States
TA  - ACS Omega
JT  - ACS omega
JID - 101691658
PMC - PMC10702299
COIS- The authors declare no competing financial interest.
EDAT- 2023/12/11 12:43
MHDA- 2023/12/11 12:44
PMCR- 2023/11/24
CRDT- 2023/12/11 06:01
PHST- 2023/08/22 00:00 [received]
PHST- 2023/09/28 00:00 [revised]
PHST- 2023/10/17 00:00 [accepted]
PHST- 2023/12/11 12:44 [medline]
PHST- 2023/12/11 12:43 [pubmed]
PHST- 2023/12/11 06:01 [entrez]
PHST- 2023/11/24 00:00 [pmc-release]
AID - 10.1021/acsomega.3c06238 [doi]
PST - epublish
SO  - ACS Omega. 2023 Nov 24;8(48):45735-45749. doi: 10.1021/acsomega.3c06238. 
      eCollection 2023 Dec 5.