Cited by 19Fluoride Effects and RemovalAdsorption and biosorption for pollutant removalInorganic Fluorides and Related Compounds

Hydroxyapatite-Activated Seaweed Biochar for Enhanced Remediation of Fluoride Contaminated Soil at Various PH Ranges

Open access
Moirana, Ruth Lorivi, Mkunda, Josephine, Machunda, Revocatus, Paradelo, Marcos, Mtei, Kelvin·2023·Environmental Advances

Abstract

This study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (Eucheuma Cottonii) biochar (HSB) at various soil pH ranges (3â-11) while monitoring the impact of contact time (30Â min - 2.5Â h), adsorbent dosage (0.1â-0.5 g) as well as the initial fluoride concentration and compare its performance to its respective seaweed biochar (SB). Activation of SB with the hydroxyapatite lead to a shift in its point-zero-charge (pHPZC) from 6 to 7.4 broadening its defluoridation pH range from a solitary 5 to amid 3 through 11. The fluoride adsorption mechanism was found to follow both Langmuir (R2Â =Â 0.956) and Freundlich (R2Â =Â 0.942) isotherm models with a maximum defluoridation capacity of 3.03 mg/g equivalent to the defluoridation efficiency of 79. This is accounted to the existence of soil ions, SB active sites, and the attached hydroxyapatite, as fluoride adsorption sites each exhibiting a dissimilar fluoride removal mechanism. Therefore, the HSB could be a promising adsorbent for fluoride removal in the fluoride contaminated agricultural soils of inclusive pH ranges.

Integrity signals

Registry

Crossref · 10.1016/j.envadv.2022.100329

Cites

36 of 36 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Moirana, R. L., Mkunda, J., Machunda, R., Paradelo, M., & Mtei, K.
Affiliations
  • Nelson Mandela African Institution of Science and Technology (TZ)
  • Natural Resources Institute (GB)
Corresponding author
Moirana, Ruth Lorivi
Venue
Environmental Advances
Publisher
Elsevier BV
Published
2023-04
Volume
11
Pages
100329
ISSN
2666-7657 (ISSN-L)
OpenAlex
W4313531521
Cited by
19
References
36
Citations by year
2026: 6 · 2025: 4 · 2024: 5 · 2023: 4
FWCI
0.95
Type
journal article
Language
en
Open access
Locations
  • Environmental Advances (publishedVersion, cc-by-nc-nd)
  • Greenwich Academic Literature Archive (University of Greenwich) (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Research England
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Fluoride Effects and Removal
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Chemistry › Inorganic Chemistry › Inorganic Fluorides and Related Compounds
Keywords
fluoride removal, Kappaphycus alvarezii, soil remediation, fluoride adsorption, point of zero charge, Langmuir isotherm, Freundlich isotherm, pH effect on adsorption, agricultural soil contamination, adsorbent activation

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review