Hydroxyapatite-Activated Seaweed Biochar for Enhanced Remediation of Fluoride Contaminated Soil at Various PH Ranges
Open accessAbstract
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
Cites
Statistics
Claims the paper makes
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?
Hydroxyapatite-activated biochars achieved defluorination efficiencies of 79%.
“Hydroxyapatite-activated biochars have achieved defluorination efficiencies of 79% [69], while biochars tailored for pesticide residue adsorption have reduced environmental availability by over 80% [57].”
From Algal-Based Carbonaceous Materials for Environmental Remediation: Advances in Wastewater Treatment, Carbon Sequestration, and Biofuel Applications (2025) · cites this paper as [69]
Cites
THE CONSTITUTION AND FUNDAMENTAL PROPERTIES OF SOLIDS AND LIQUIDS. PART I. SOLIDS.
Langmuir, I. (1916) · Journal of the American Chemical Society · doi:10.1021/ja02268a002 · Cited by 10,017 · see citing works
Thermodynamics of solvation of ions. Part 5.—Gibbs free energy of hydration at 298.15 K
Marcus, Y. (1991) · Journal of the Chemical Society Faraday Transactions · doi:10.1039/ft9918702995 · Cited by 2,226 · see citing works
Ho, Y. (2005) · Water Research · doi:10.1016/j.watres.2005.10.040 · Cited by 1,329 · see citing works
Identification of selective ion-exchange resin for fluoride sorption
Meenakshi, S., & Viswanathan, N. (2007) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2006.12.032 · Cited by 466 · see citing works
Kinetic modeling of liquid-phase adsorption of reactive dyes on activated carbon
Yang, X., & Al‐Duri, B. (2005) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2005.01.093 · Cited by 416 · see citing works
Chai, L., Wang, Y., Zhao, N., Yang, W., & You, X. (2013) · Water Research · doi:10.1016/j.watres.2013.02.057 · Cited by 350 · see citing works
Toxic effects of fluoride on organisms
Zuo, H., Chen, L., Kong, M., Qiu, L., Lu, P. Z., Wu, P., Yang, Y., & Chen, K. (2018) · Life Sciences · doi:10.1016/j.lfs.2018.02.001 · Cited by 311 · see citing works
Das, D. P., Das, J., & Parida, K. M. (2003) · Journal of Colloid and Interface Science · doi:10.1016/s0021-9797(03)00082-1 · Cited by 291 · see citing works
Removal of fluoride from aqueous solution by polypyrrole/Fe3O4 magnetic nanocomposite
Bhaumik, M., Leswifi, T. Y., Maity, A., Srinivasu, V. V., & Onyango, M. S. (2010) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2010.10.098 · Cited by 259 · see citing works
Uptake of fluoride by nano-hydroxyapatite/chitosan, a bioinorganic composite
Sundaram, C. S., Viswanathan, N., & Meenakshi, S. (2008) · Bioresource Technology · doi:10.1016/j.biortech.2008.03.012 · Cited by 209 · see citing works
McQuaker, N. R., & Gurney, M. (1977) · Analytical Chemistry · doi:10.1021/ac50009a022 · Cited by 201 · see citing works
López–Valdivieso, A., Reyes-Bahena, J. L., Song, S., & Herrera-Urbina, R. (2005) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2005.11.060 · Cited by 188 · see citing works
Fluoride sorption by nano-hydroxyapatite/chitin composite
Sundaram, C. S., Viswanathan, N., & Meenakshi, S. (2009) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2009.06.152 · Cited by 146 · see citing works
Adsorptive removal of fluoride from aqueous media using Citrus limonum (lemon) leaf
Tomar, V., Prasad, S., & Kumar, D. (2013) · Microchemical Journal · doi:10.1016/j.microc.2013.09.010 · Cited by 121 · see citing works
Zhang, X., Zhang, L., Li, Z., Jiang, Z., Zheng, Q., Lin, B., & Pan, B. (2017) · Environmental Science & Technology · doi:10.1021/acs.est.7b04164 · Cited by 112 · see citing works
Liang, C., Gascó, G., Fu, S., Méndez, A., & Paz‐Ferreiro, J. (2015) · Soil and Tillage Research · doi:10.1016/j.still.2015.10.002 · Cited by 107 · see citing works
REACTIONS OF FLUORIDE ION WITH HYDROXYAPATITE
McCann, H. G. (1953) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(18)71366-5 · Cited by 105 · see citing works
Availability of fluoride to plants grown in contaminated soils
Arnesen, A. K. M. (1997) · Plant and Soil · doi:10.1023/a:1004210713596 · Cited by 105 · see citing works
Walsh, K., Mayer, S., Rehmann, D., Hofmann, T. F., & Glas, K. (2020) · Separation and Purification Technology · doi:10.1016/j.seppur.2020.116704 · Cited by 92 · see citing works
Gan, C., Jia, Y., & Yang, J.-Y. (2020) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2020.124694 · Cited by 92 · see citing works
Gao, H., Zhang, Z., & Wan, X. (2012) · Environmental Geochemistry and Health · doi:10.1007/s10653-012-9459-x · Cited by 87 · see citing works
(2016) · Korean Journal of Agricultural Science · doi:10.7744/kjoas.20160054 · Cited by 82 · see citing works
Nehra, S., Raghav, S., & Kumar, D. (2019) · Environmental Pollution · doi:10.1016/j.envpol.2019.113773 · Cited by 71 · see citing works
Bio-inspired materials for defluoridation of water: A review
Hegde, R. M., Rego, R. M., Potla, K. M., Kurkuri, M. D., & Kigga, M. (2020) · Chemosphere · doi:10.1016/j.chemosphere.2020.126657 · Cited by 67 · see citing works
WATER DEFLUORIDATION BY MEXICAN HEULANDITE–CLINOPTILOLITE
Díaz-Nava, C., Olguín, M. T., & Solache‐Ríos, M. (2002) · Separation Science and Technology · doi:10.1081/ss-120005662 · Cited by 61 · see citing works
Ibrahim, Y. E., ABUAFFAN, A. H., & Bjorvatn, K. (1995) · International Journal of Paediatric Dentistry · doi:10.1111/j.1365-263x.1995.tb00183.x · Cited by 60 · see citing works
Fluoride Content in Selected Food Items from Five Areas in East Africa
Kjellevold, M., Maage, A., Macha, E., Julshamn, K., & Bjorvatn, K. (1997) · Journal of Food Composition and Analysis · doi:10.1006/jfca.1997.0537 · Cited by 59 · see citing works
Fluoride uptake and translocation in food crops grown in fluoride‐rich soils
Rizzu, M., Tanda, A., Canu, L., Masawe, K., Mtei, K., Deroma, M. A., Roggero, P. P., & Seddaiu, G. (2020) · Journal of the Science of Food and Agriculture · doi:10.1002/jsfa.10601 · Cited by 45 · see citing works
Self-citationQiu, H., Ye, M., Zhang, M., Zhang, X., Zhao, Y., & Yu, J. (2020) · ACS ES&T Engineering · doi:10.1021/acsestengg.0c00005 · Cited by 40 · see citing works
The influence of fertilizers on the behavior of fluoride fractions in the alkaline soil
Moirana, R. L., Mkunda, J. J., Paradelo, M., Machunda, R. L., & Mtei, K. (2021) · Journal of Fluorine Chemistry · doi:10.1016/j.jfluchem.2021.109883 · Cited by 39 · see citing works
Self-citationMukherjee, S., Dutta, S., Ray, S., & Halder, G. (2018) · Environmental Science and Pollution Research · doi:10.1007/s11356-018-1931-4 · Cited by 37 · see citing works
Dental caries and fluorosis in Arussi province, Ethiopia
Olsson, B. (1978) · Community Dentistry And Oral Epidemiology · doi:10.1111/j.1600-0528.1978.tb01175.x · Cited by 29 · see citing works
Moirana, R. L., Mkunda, J. J., Paradelo, M., Machunda, R. L., & Mtei, K. (2022) · Applied and Environmental Soil Science · doi:10.1155/2022/6967031 · Cited by 13 · see citing works
Self-citationChristina, E., & Viswanathan, P. (2015) · International Journal of Pharma and Bio Sciences · Cited by 9 · see citing works
Zang, J., Wang, N., Huang, N., Wang, H., Sui, B., Zhao, C., Zhao, X., & Liu, J. (2022) · SSRN Electronic Journal · doi:10.2139/ssrn.4089595 · Cited by 1 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
Foroutan, R., Mohammadi, R., Razeghi, J., Ahmadi, M., & Ramavandi, B. (2024) · Environmental Research · doi:10.1016/j.envres.2024.118641 · Cited by 113 · see citing works
Wang, Y., Ma, C., Kong, D., Lian, L., & Liu, Y. (2023) · Journal of environmental chemical engineering · doi:10.1016/j.jece.2023.111263 · Cited by 40 · see citing works
Rinusuba, V., Balasubramaniam, G., Muthukumarasamy, N., Krishnaswamy, M., Chinnappan, B. A., Sridhar, N., Balakumar, S., & Velauthapillai, D. (2024) · Sustainable Chemistry and Pharmacy · doi:10.1016/j.scp.2024.101653 · Cited by 40 · see citing works
González Fernández, L. A., Medellín Castillo, N. A., Sánchez Polo, M., Navarro Frómeta, A. E., & Vilasó Cadre, J. E. (2025) · Processes · doi:10.3390/pr13020556 · Cited by 37 · see citing works
Synthesis and characterization of bismuth-doped hydroxyapatite nanorods for fluoride removal
Adamu, D. B., Zereffa, E. A., Segne, T. A., Razali, M. H., & Lemu, B. R. (2023) · Environmental Advances · doi:10.1016/j.envadv.2023.100360 · Cited by 21 · see citing works
Applications and challenges of modified algal biochar in environmental remediation
Sun, Y. P., Hao, C., Wang, Y., Zhong, H., Zhou, S., Meng, H., He, H., Lei, P., & Rong, N. (2025) · Chemical Engineering Journal · doi:10.1016/j.cej.2025.167460 · Cited by 17 · see citing works
Chen, H., Zhang, R., Qu, X., Yuan, Y., Zhu, B., Zhao, S., & Jiang, T. (2023) · Separations · doi:10.3390/separations10110559 · Cited by 15 · see citing works
Sulistyaningsih, T., Sari, D. A., Widiarti, N., Astuti, W., Wulandari, R., & Harjunowibowo, D. (2024) · Waste Management Bulletin · doi:10.1016/j.wmb.2024.02.007 · Cited by 14 · see citing works
Mohanapragash, A. G., Kaleeswari, R. K., Madhupriyaa, D., Salma Santhosh, S., Meena, S., Baskar, M., Umamaheswari, T., Selvamurugan, M., & Ramesh, T. (2025) · International Journal of Environmental & Analytical Chemistry · doi:10.1080/03067319.2025.2478610 · Cited by 7 · see citing works
Mobility of Fluoride and Fluorocarbons in the Soil
Moirana, R. L., Bayuo, J., & Rugaika, A. M. (2024) · Environmental science and engineering · doi:10.1007/978-981-97-7733-4_3 · Cited by 6 · see citing works
Self-citationEcotoxicological insights into fluoride pollution affecting soil, plant and human health
Farooqi, Z. U. R., Karim, A., Qadir, A. A., Sonia, A., Mohy-Ud-Din, W., Wambu, E. W., Ali, Q., Haider, F. U., Gururani, M. A., & Zulfiqar, U. (2026) · Ecotoxicology and Environmental Safety · doi:10.1016/j.ecoenv.2026.120295 · Cited by 4 · see citing works
Mendke, T., Srilakshmi, C., & Maddikeari, M. (2025) · ChemistrySelect · doi:10.1002/slct.202504350 · Cited by 2 · see citing works
Scheverin, V. N., Diaz, E. M., & Horst, M. F. (2026) · Springer eBooks · doi:10.1007/978-3-030-11155-7_218-1 · Cited by 2 · see citing works
Hansdah, S., Dey, S. K., & Mishra, P. C. (2026) · Separation Science and Technology · doi:10.1080/01496395.2026.2678887 · Cited by 1 · see citing works
Moirana, R. L. (2023) · doi:10.58694/20.500.12479/2196 · Cited by 1 · see citing works
Self-citationBhomick, P. C., Supong, A., Sema, A. I., & Sinha, D. (2024) · Journal of the Serbian Chemical Society · doi:10.2298/jsc230428015b
Areti, H. A., Jayakumar, M., Abo, L. D., Prasad, N., Krishnan, S., Salodi, N. W., Jima, K. A., & Waktola, A. A. (2026) · Water Air & Soil Pollution · doi:10.1007/s11270-026-09639-2
Study on Chemical Speciation of Fluoride in Soil of a Fluorine Chemical Industrial Park
边, 归. (2026) · Hans Journal of Soil Science · doi:10.12677/hjss.2026.143020
Pereira, A. C. (2026) · Journal International Review of Research Studies · doi:10.66104/0bnavv39
- 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
- gold
- doi.org
- Licence
- 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