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Journal articles on the topic 'Defluoridation Efficiency; Isotherm Study'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Lorivi, Moirana Ruth, Joseph Mkunda, Revocatus Machunda, Marchus Paradelo, and Kelvin Mtei. "Hydroxyapatite-activated seaweed biochar for enhanced remediation of fluoride contaminated soil at various pH ranges." Environmental Advances 11, no. 10039 (2022): 1–9. https://doi.org/10.1016/j.envadv.2022.100329.

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This study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (<em>Eucheuma Cottonii</em>) biochar (HSB) at various soil pH ranges (3–11) while monitoring the impact of contact time (30 min - 2.5 h), adsorbent dosage (0.1–0.5 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

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Kebena, Gebeyehu Motora1* Dejene Ayele Tesema2. "REMOVAL OF FLUORIDE FROM AQUEOUS SOLUTION USING FIRED CLAY SOIL PILLARED WITH TEA LEAF ASH COMPONENTS." INDO AMERICAN JOURNAL OF PHARMACEUTICAL RESEARCH 07, no. 09 (2017): 242–435. https://doi.org/10.5281/zenodo.1036319.

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This study reports on the adsorption of fluoride ion from aqueous solutions by using fired clay soil, pillared with tea leave ash components. The potential of low cost material fired clay soil and fired clay soil pillared with tea leave ash components for fluoride removal from aqueous solution was evaluated by using fluoride ion selective electrode. Pillaring of clay soil with tea leave ash was done by thoroughly mixing fifteen gram of tea leave ash and three hundred gram of clay soil using distilled water and it was aged for 96 hours until it was dried. Untreated clay soil and clay soil pilla

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3

Masindi, Vhahangwele, Wilson Mugera Gitari, and Tholiso Ngulube. "Kinetics and equilibrium studies for removal of fluoride from underground water using cryptocrystalline magnesite." Journal of Water Reuse and Desalination 5, no. 3 (2015): 282–92. http://dx.doi.org/10.2166/wrd.2015.080.

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In the present study, the defluoridation capabilities and adsorption mechanisms of cryptocrystalline magnesite were evaluated. All experiments were done by batch procedure. Conditions assessed include time, dosage, concentration, pH and the effects of competing ions. Optimum defluoridation conditions were observed to be 20 g/L magnesite, 2:100 solid:liquid ratio, 20 min of agitation and 60 mg/L fluoride concentration. Adsorption of fluoride by magnesite was observed to be independent of pH. Cryptocrystalline magnesite showed &gt;99% efficiency for fluoride removal. Adsorption kinetics fitt

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4

Workeneh, Kifle, Enyew Amare Zereffa, Toshome Abdo Segne, and Rajalakshmanan Eswaramoorthy. "Eggshell-Derived Nanohydroxyapatite Adsorbent for Defluoridation of Drinking Water from Bofo of Ethiopia." Journal of Nanomaterials 2019 (August 26, 2019): 1–12. http://dx.doi.org/10.1155/2019/2458312.

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Fluoride has become a notable toxicological environmental hazard worldwide because it is often found in groundwater. In the present study, hydroxyapatite adsorbent was synthesized from eggshell waste to remove fluoride from aqueous solution. XRD, FT-IR, and TGA techniques were used to characterize the prepared adsorbent. Batch adsorption studies were performed to examine the adsorption capacity of hydroxyapatite such as the effect of the initial pH of the solution, contact time, adsorbent dose, and initial fluoride concentration. The fluoride ion-selective electrode was used to determine the f

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5

Qazi, Malihe, Hamze Ali Jamali, Reza Darvishi Cheshmeh Soltani, Mahmoud Nasr, Adel Kamyab Rudsari, and Reza Ghanbari. "A Comparison Study on Defluoridation Capabilities Using Syzygium cumini and Psidium guajava: Process Optimization, Isotherm, Kinetic, Reusability Studies." Water 14, no. 23 (2022): 3939. http://dx.doi.org/10.3390/w14233939.

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For the first time, this work conducted a comparison of two indigenous plants in Iran, namely, Syzygium cumini and Psidium guajava, which were prepared as low-cost adsorbents to remove fluoride contamination from aqueous solution. The results revealed the nonlinearity of the interactive effects and showed that the pH and adsorbent dosage were the most influential factors during fluoride adsorption. The results of characterization exhibited a mesoporous structure of prepared biosorbents; therefore, the adsorption process may involve multiple functional groups, resulting in electrostatic attract

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AL-Hamadi, Mahfoudh M., Anass A. Alnedhary, Hadi Ali Quria’a, and Ghadeer M. Al-mutawakel. "Adsorption Isotherm, Kinetic and Thermodynamic Studies for Removal of Fluoride Ions from Drinking Water Using Modified Natural Pumice." مجلة جامعة صنعاء للعلوم التطبيقية والتكنولوجيا 2, no. 5 (2024): 403–12. http://dx.doi.org/10.59628/jast.v2i5.1151.

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This study aimed to modify pumice using aluminum chloride as an adsorbent for defluoridation. Batch and column experiments were carried out to evaluate the effects of pH, initial fluoride concentration, contact time, dose, and temperatur. The modified pumice adsorbent showed good fluoride removal in both batch and column studies. Fluoride up-take was observed to be effective >7%, at pH 6.5-7.5, and adsorption equilibrium time was observed at 60 min. the adsorption results were modelled using kinetic and isotherm models. Experimental data indicated that fluoride adsorption follows the second

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7

Budeli, Tshilidzi L., Wilson M. Gitari, and Rabelani Mudzielwana. "Enhancing the Fluoride Adsorption Efficiency of Diatomaceous Earth Through Modification with Ce/Al/Fe Metal Oxides." Water 17, no. 1 (2025): 129. https://doi.org/10.3390/w17010129.

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Sustainable Development Goal 6.1 calls for the development of technologies to improve water quality for human consumption to ensure that there is clean drinking water for everyone by 2030. This study aims to contribute to the goal by synthesizing Ce/Al/Fe metal oxide-modified diatomaceous earth for the adsorption of fluoride from drinking water. Adsorption experiments were performed to determine the effectiveness of the Ce/Al/Fe metal oxide-modified diatomaceous earth in regard to fluoride adsorption. About 98% fluoride removal efficiency was obtained from an initial fluoride concentration of

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8

Denga, Masindi E., Wilson M. Gitari, Anthony A. Izuagie, and Segun A. Akinyemi. "Defluoridation of groundwater using mechanochemically-activated clay soil." Water Practice and Technology 13, no. 3 (2018): 599–611. http://dx.doi.org/10.2166/wpt.2018.074.

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Abstract High concentrations of fluoride in drinking water are reported to be hazardous to human health. This study was conducted to assess the efficiency of mechanochemically-activated aluminosilicate clay soil in removing fluoride from groundwater. The soil was subjected to physicochemical transformation through mechanochemical activation for different time intervals (5, 10, 15 and 30 min). The highest specific surface obtained was about 50 m2/g, with the sample activated for 30 minutes. Fourier Transform Infrared (FT-IR) analyses of samples showed an increase in absorbance by Si-O-H groups

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9

Kashyap, Krishna Kumar. "Defluoridation of Groundwater with the Help of Azadirachta indica leaves as Bioadsorbent in Korba, Chhattisgarh, India." Bioscience Biotechnology Research Communications 15, no. 2 (2022): 321–27. http://dx.doi.org/10.21786/bbrc/15.2.9.

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In this paper, we have used a removal technique of fluoride from groundwater in Korba district, Chhattisgarh, using thermally activated neem (Azadirachta indica) leaves as adsorbents. For this purpose, we collected the groundwater sample in January–March 2021. The Ion-Selective Electrode (ISE) technique was used to assess the fluoride concentration in groundwater samples. Neem leaves were efficient at removing fluoride in this study. Fluoride has a split personality in the human system, having a damaging impact when fluoride concentration is more than 1.5 mg/L, causing dental and skeletal fluo

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Gebremariam, Azmera Mezgebo, Abraha Gebrekidan Asgedom, Kebede Nigussie Mekonnen, Mengstu Etay Ashebir, Zenebe Hailu Gebremikael, and Kassa Amare Mesfin. "Defluoridation of Water Using Aluminum Hydroxide Activated Carbon Biosorbents." Advances in Materials Science and Engineering 2022 (March 31, 2022): 1–12. http://dx.doi.org/10.1155/2022/4038444.

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This study was aimed to investigate the efficiency of locally available low-cost and eco-friendly activated agricultural biosorbents produced from corncob and sorghum husk for the removal of fluoride from aqueous solution using batch adsorption. The activated biosorbents were characterized using SEM, XRD and FTIR spectroscopy. Effects of particle size (0.063–1.0 mm), contact time (15–120 min), pH (2–12), dose (2–10 g), and initial concentration (0.5–5.0 mg/L) were investigated. The morphology analysis revealed that biosorbents showed the presence of a high binding capacity for fluoride adsorpt

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11

Obijole, Olumuyiwa, Mugera Gitari, Patrick Ndungu, and Amidou Samie. "Mechanochemically Activated Aluminosilicate Clay Soils and their Application for Defluoridation and Pathogen Removal from Groundwater." International Journal of Environmental Research and Public Health 16, no. 4 (2019): 654. http://dx.doi.org/10.3390/ijerph16040654.

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In this study, aluminosilicate rich clay soils were prepared through mechanochemical activation. The chemical and mineralogical properties were investigated using X-Ray Fluorescence (XRF) and X-ray diffraction (XRD). The functional groups, morphology and surface area were evaluated using Fourier Transform Infra-Red (FTIR), Scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis. Batch experiments were used to evaluate its defluoridation efficiency while antibacterial activities were assessed using well diffusion method. Maximum adsorption capacity was found to be 1.87 mg/g

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Valentukeviciene, Marina, Ramune Zurauskiene, and Youssef Amine Boussouga. "Fluoride Removal from Groundwater by Technological Process Optimization." Ecological Chemistry and Engineering S 26, no. 1 (2019): 133–47. http://dx.doi.org/10.1515/eces-2019-0010.

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Abstract Fluoride removal from aqueous solutions was studied using nanofiltration and sorption techniques which have always been best key ways to deal with water contaminated by fluoride. In this presented work, we were firstly interested on fluoridated rejected water overcoming the drawback of RO membrane process of groundwater treatment plant in Baltic region (Kretinga, Lithuania). Opoka sorbent has shown effective results of fluoride sorption with efficiency higher than 77 %. In order to understand the sorption phenomenon and to validate the results obtained, we have applied experimental da

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13

Kingongo, Hamisi M., Jacob Kihila, Nicholaus Mwageni, and Stalin Mkumbo. "Effectiveness and Efficiency of Eggshells and Tamarindus indica (Tamarind) Seeds as Absorbents in Removal of Fluoride Ions from Water at Different PH Level." East African Journal of Environment and Natural Resources 8, no. 1 (2025): 300–320. https://doi.org/10.37284/eajenr.8.1.2921.

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Excessive fluoride ingestion predominantly comes from drinking water sources. Information on the extent of health problems caused by fluoride is scanty. Prevalence and severity of dental and skeletal fluorosis in northern Tanzania have been reported to be higher than would be expected from ingestion of fluoride through drinking water alone. To fill in this gap, a study was conducted aiming to develop a natural adsorbent suitable for the defluoridation of drinking water by using the Jar test method. The water sample in the investigation was synthesized by mixing sodium fluoride (NaF), with deio

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14

Zhu, Wenyun, Zhonglin Li, Yonghang Tan, et al. "Enhanced Fluoride Removal Performance from Water by Calcined-State Mayenite (Ca12Al14O33): Adsorption Characteristics and Mechanism." Materials 18, no. 10 (2025): 2189. https://doi.org/10.3390/ma18102189.

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This study achieved the preparation of budget-friendly stratified Ca-Al adsorbents using a simplified precipitation synthesis route with subsequent pyroprocessing, showing superior defluoridation capabilities in aqueous environments. The structural properties and defluoridation performance of the adsorbents were systematically investigated by optimizing critical synthesis parameters, including calcium-to-aluminum molar ratios, the solution pH during co-precipitation, and calcination temperature. Characterization results revealed that the optimal sample (prepared at a Ca/Al ratio of 2:3, initia

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15

Amaibi, P. M., J. F. Egong, C. R. Iwe, and C. C. Obunwo. "Adsorption and Kinetic Studies for Removal of Fluoride in Aqueous System by Activated Carbon Produced from Lemon Peels." Journal of Applied Sciences and Environmental Management 28, no. 5 (2024): 1413–19. http://dx.doi.org/10.4314/jasem.v28i5.11.

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Globally, fluoride contamination in drinking water has been a major environmental problem, imposing severe threat to human health through various disease conditions. Therefore, the objective of this paper was to investigate the adsorption and kinetic studies for the removal of fluoride in aqueous system by activated carbon produced from lemon peels using appropriate standard procedures. Adsorptive efficiency of the lemon peel powder for fluoride ions in water was 94.90% at an optimum contact time of 100 minutes. The fluoride ions removal efficiency of the activated carbon was considered favour

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16

Jian, Shaoju, Yuhuang Chen, Fengshuo Shi, et al. "Template-Free Synthesis of Magnetic La-Mn-Fe Tri-Metal Oxide Nanofibers for Efficient Fluoride Remediation: Kinetics, Isotherms, Thermodynamics and Reusability." Polymers 14, no. 24 (2022): 5417. http://dx.doi.org/10.3390/polym14245417.

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The occurrence of fluoride contamination in drinking water has gained substantial concern owing to its serious threat to human health. Traditional adsorbents have shortcomings such as low adsorption capacity and poor selectivity, so it is urgent to develop new adsorbents with high adsorption capacity, renewable and no secondary pollution. In this work, magnetic electrospun La-Mn-Fe tri-metal oxide nanofibers (LMF NFs) for fluoride recovery were developed via electrospinning and heat treatment, and its defluoridation property was evaluated in batch trials. Modern analytical tools (SEM, BET, XRD

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17

G., Karthikeyan, Shunmuga Sundarraj A., Meenakshi S., and P. Elango K. "Adsorption dynamics and the effect of temperature of fluoride at alumina-solution interface." Journal of Indian Chemical Society Vol. 81, Jun 2004 (2004): 461–66. https://doi.org/10.5281/zenodo.5833384.

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Department of Chemistry, Gandhigram Rural Institute-Deemed University, Gandhigram-624 302, India <em>E-mail</em> : drg_karthikeyan@rediffmail.com      <em> Fax</em> : 91-451-2454466 <em>Manuscript received 24 April 2003. revised 14 October 2003, accepted 14 january 2004</em> The defluoridation efficiency of the commercially available grades of activated alumina were determined. The various factors which influence the defluoridation efficiency of the material were studied. There was a marked dependence of pH on the defluoridating capacity. The adsorption of fluoride ions on

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18

Ngulube, T., M. W. Gitari, and H. Tutu. "Defluoridation of groundwater using mixed Mukondeni clay soils." Water Supply 17, no. 2 (2016): 480–92. http://dx.doi.org/10.2166/ws.2016.157.

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Excess fluoride in drinking water is harmful to human health and therefore it needs to be removed from water before consumption. The potential of locally available mixed Mukondeni clay soils (MMCS) as a cheap adsorbent for the removal of fluoride from aqueous solution was investigated. Characterization of MMCS was done by X-ray fluorescence, X-ray diffraction, scanning electron microscopy, Fourier transform infrared and Brunauer Emmett Teller. Cation exchange capacity and point of zero charge of the clays were determined using standard methods. Parameters optimized included: contact time, adso

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You, Kun, Peijie Li, Jinxiang Fu, et al. "Fabrication of Manganese-Supported Activated Alumina Adsorbent for Defluoridation of Water: A Kinetics and Thermodynamics Study." Water 13, no. 9 (2021): 1219. http://dx.doi.org/10.3390/w13091219.

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Fluoride pollution frequently occurs in many underground drinking water sources due to discrepancies in the geological environment. To address this problem, a manganese-supported activated alumina (MnOOH-supported AA) adsorbent was proposed in the present study. The adsorbent was prepared with an impregnation method, then the morphology and microstructure were systematically characterized. Further, the adsorption kinetics and thermodynamics were systematically explored through static experiments to confirm the adsorption mechanism. The results showed that MnOOH was successfully loaded on the a

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Pathirannehe, P. N. S., T. D. Fernando, and C. S. K. Rajapakse. "Removal of Fluoride from Drinking Water Using Protonated Glycerol Diglycidyl Ether Cross-Linked Chitosan Beads." Chemistry & Chemical Technology 15, no. 2 (2021): 205–16. http://dx.doi.org/10.23939/chcht15.02.205.

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In this study, physically and chemically modified chitosan; protonated glycerol diglycidyl ether cross-linked chitosan beads (GDCLCB/H+) were prepared and characterized using FTIR and SEM. The optimum defluoridation capacity (DC) of GDCLCB/H+ was observed at the initial F- ion concentration of 15 mg/l, adsorbent dosage of 0.6 g, contact time of 30 min and pH of the solution was in the range of 5–7 at 303 ± 2 K. The equilibrium adsorption data fitted well with Langmuir and Freundlich isotherm models. The maximum adsorption capacity (q0), obtained from Langmuir isotherm for F-adsorption was foun

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Bhomick, Parimal, Aola Supong, Akito Sema, and Dipak Sinha. "Defluoridation using pinecone-based activated carbon: Adsorption isotherm, kinetics, regeneration, and co-ions effect investigation." Journal of the Serbian Chemical Society, no. 00 (2024): 15. http://dx.doi.org/10.2298/jsc230428015b.

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In this work, cheap and locally available pinecones of Pinus kiseya were used as a precursor to prepare activated carbon using single-step KOH activation for the removal of fluoride from water. The prepared activated carbon?s BET surface area, and total pore volume, were determined as 972.13 m2g-1 and 0.469 cm3g-1 respectively. Batch adsorption studies were evaluated at different contact times, solution pH, adsorbent dose, and concentration to ascertain the optimum conditions for maximum adsorption. The adsorption data were fitted with isotherm models (Langmuir, Freundlich ad Temkin isotherm m

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22

G., Alagumuthu, J. A. Ranjit Singh A., and Sundar S. "Kinetics and thermodynamics of fluoride ion sorption on fire clay from aqueous solution." Journal of Indian Chemical Society Vol. 85, Jan 2008 (2008): 111–13. https://doi.org/10.5281/zenodo.5808621.

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Post Graduate and Research Department of Chemistry, Department of Advanced Zoology and Biotechnology, Sri Paramakalyani College, Alwarkurichi-627 412, Tamilnadu, India <em>E-mail :</em> alagupathi@yahoo.co.in <em>Manuscript received 27 April 2007, revised 27 September 2007, accepted 9 October 2007</em> The kinetics and thermodynamics of fluoride ions sorption on fire clay from aqueous solution have been investigated. The various factors that influence the defluoridation efficiency of the material were studied. Adsorption obeyed both Langmuir and Freundlich isotherm models. Various thermodynami

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23

Yihunu, Endashaw Workie, Haiyan Yu, Wen Junhe, et al. "A comparative study on defluoridation capabilities of biosorbents: Isotherm, kinetics, thermodynamics, cost estimation and regeneration study." Environmental Engineering Research 25, no. 3 (2019): 384–92. http://dx.doi.org/10.4491/eer.2019.097.

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Janta, S., S. Watanesk, R. Watanesk, and Sakdiphon Thiensem. "Cost Effective Natural Adsorbent for Fluoride Removal." Advanced Materials Research 55-57 (August 2008): 865–68. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.865.

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In this study, the uptake of fluoride by raw diatomite and diatomite activated by heat treatment was investigated. Influential parameters such as contact time, pH and adsorption isotherm were also studied. The results showed that the diatomite heated to 500 oC performed better than other heat treatment products and the equilibration time needed for fluoride removal by the adsorbents was reached at 60 min. Results revealed that the capacity of the adsorbents for removing fluoride is independent of the pH when the pH is higher than 4. The adsorption isotherm of the 500 oC treated diatomite showe

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Sudasinghe, Madhusha, Mahesh Jayaweera, Buddhika Gunawardana, Jagath Manatunge, and Gayan Madhusanka. "Defluoridation of calcium-rich groundwater using iron oxide nanoparticles." Water Practice and Technology 14, no. 3 (2019): 665–81. http://dx.doi.org/10.2166/wpt.2019.052.

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Abstract It has been suggested that moderate to high fluoride ion concentrations in the presence of calcium in groundwater can represent human health hazards resulting in possible lesions in tubular cells, leading to chronic kidney disease of unknown etiology (CKDu). This study focuses on fluoride removal in the presence of calcium using iron oxide nanoparticles (FeONs) as an effective adsorbent in single- and multi-solute batch-studies. Fluoride and calcium removal by FeONs in single-solute batch-studies occurred only by adsorption. Both species followed the Langmuir isotherm model and pseudo

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Mukherjee, Shraboni, Sujata Dutta, Sourjya Ray, and Gopinath Halder. "A comparative study on defluoridation capabilities of biosorbents: isotherm, kinetics, thermodynamics, cost estimation, and eco-toxicological study." Environmental Science and Pollution Research 25, no. 18 (2018): 17473–89. http://dx.doi.org/10.1007/s11356-018-1931-4.

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Jothimani, Palanisamy, Sai Akshitha Singara Velu, and Sabesh Vagul G. "Defluoridation of Groundwater Using Low-cost Adsorbents." International Journal of Environment and Climate Change 14, no. 11 (2024): 569–83. http://dx.doi.org/10.9734/ijecc/2024/v14i114569.

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Excessive fluoride in groundwater poses significant health risks to millions of people worldwide, necessitating effective and accessible defluoridation methods. This study investigates the use of column filtration for removing fluoride from groundwater. The study employs a systematic approach to evaluate the performance of different adsorbent materials in a fixed-bed column setup. Various materials were tested as adsorbents in column, including Brick powder, Neem leaf powder, Lime, Sawdust, and Vetiver. The research examines the effects of key operational parameters such as bed depth, flow rat

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Nayak, Bhagyashree, Bidut Prava Mohanty, M. R. Mahananda, and Samikshya Mishra. "Bioadsorption potency of Albizia ferruginea in the removal of fluoride from contaminated water." Research Journal of Chemistry and Environment 27, no. 8 (2023): 55–65. http://dx.doi.org/10.25303/2708rjce055065.

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Due to the high toxicity of fluoride to humanity, it is imperative to treat fluoride-contaminatked water for human consumption. The most commonly used method for the defluoridation of water is bio-adsorption. The present study has investigated the ability of Albizia ferruginea to remove fluoride from water through adsorption. This experiment was undertaken in batch mode. The adsorption process was systematically studied regarding the influence of pH, interaction time, temperature, adsorbent loading, fluoride ion concentration and the effect of coexisting anions to understand the ideal conditio

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Gwala, Poonam, Subhash Andey, Vasant Mhaisalkar, Pawan Labhasetwar, Sarika Pimpalkar, and Chetan Kshirsagar. "Lab scale study on electrocoagulation defluoridation process optimization along with aluminium leaching in the process and comparison with full scale plant operation." Water Science and Technology 63, no. 12 (2011): 2788–95. http://dx.doi.org/10.2166/wst.2011.475.

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An excess or lack of fluoride in drinking water is harmful to human health. Desirable and permissible standards of fluoride in drinking water are 1.0 and 1.5 mg/L, respectively, as per Indian drinking water quality standards i.e., BIS 10500, 1991. In this paper, the performance of an electro-coagulation defluoridation batch process with aluminium electrodes was investigated. Different operational conditions such as fluoride concentration in water, pH and current density were varied and performance of the process was examined. Influence of operational conditions on (i) electrode polarization ph

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Kumari, Usha, Sushanta K. Behera, and B. C. Meikap. "A novel acid modified alumina adsorbent with enhanced defluoridation property: Kinetics, isotherm study and applicability on industrial wastewater." Journal of Hazardous Materials 365 (March 2019): 868–82. http://dx.doi.org/10.1016/j.jhazmat.2018.11.064.

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González-Ponce, Herson Antonio, Didilia Ileana Mendoza-Castillo, Adrián Bonilla-Petriciolet, Hilda Elizabeth Reynel-Ávila, and Karla Iveth Camacho-Aguilar. "Regeneration Analysis of Bone Char Used in Water Defluoridation: Chemical Desorption Route, Surface Chemistry Analysis and Modeling." International Journal of Chemical Engineering 2023 (March 6, 2023): 1–12. http://dx.doi.org/10.1155/2023/8378162.

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High concentrations of fluoride (F−) in drinking water represent a public health threat, and consequently, effective and sustainable methods are required to improve the water quality, mainly in developing and low-income countries. This study focused on the thermodynamics of fluoride adsorption on bone char regenerated with NaOH for water defluoridation. A detailed analysis of the number of fluoride adsorption/desorption cycles, their impact on the performance and surface chemistry of bone char using different NaOH concentrations, and modeling of the adsorption mechanism using statistical physi

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Abd Ali, Ziad T., and Zainab Z. Ismail. "Experimental and modeling study of water defluoridation using waste granular brick in a continuous up-flow fixed bed." Environmental Engineering Research 26, no. 2 (2020): 190506–0. http://dx.doi.org/10.4491/eer.2019.506.

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Contamination of surface and groundwater with excessive concentrations of fluoride is of significant health hazard. Adsorption of fluoride onto waste materials of no economic value could be a potential approach for the treatment of fluoride-bearing water. This experimental and modeling study was devoted to investigate for the first the fluoride removal using unmodified waste granular brick (WGB) in a fixed bed running in continuous mode. Characterization of WGB was carried out by FT-IR, SEM, and EDX analysis. The batch mode experiments showed that they were affected by several parameters inclu

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Kishore, Medikondu. "Potable Water Defluoridation by Lowcost Adsorbents from Mimosideae Family Fruit Carbons: A Comparative Study." International Letters of Chemistry, Physics and Astronomy 56 (July 2015): 71–81. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.56.71.

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Fluoride present in the form of minerals, which dissolves in ground water and contaminates it. This paper deals with the mimosideae family fruit carbons are used for the removal of fluoride by the process of adsorption. The activated carbon was prepared by carbonisation of Enterolobium saman fruit carbon (ESC) and Prosofis juliflora fruit carbon (PJC) in muffle furnace and treated with 2.5 x 10-1M nitric acid and thermally activated in air oven. The activated carbon was characterized and chemical analysis was done by X-ray fluorescence. Batch experiments were carried out to establish the vario

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Havale, Raghavendra, Shrutha S. P., Revati K., et al. "Natural solution for fluoride removal: a comparative analysis of three adsorbents." International Journal Of Community Medicine And Public Health 11, no. 11 (2024): 4354–60. http://dx.doi.org/10.18203/2394-6040.ijcmph20243298.

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Background: Defluoridation of groundwater is a major global health concern, and research has been conducted worldwide to determine the optimal level of fluoride in drinking water. Adsorption is a common method for defluoridation. The present research planned to use natural adsorbents for defluoridation, they are effective and economical. This study aimed to evaluate and compare the efficacy of powders of Pineapple peel, Banana peel and Ginger as adsorbents to defluoridate the fluoridated drinking water in chosen demographic area. Methods: Water samples from a highly fluoridated area were colle

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Ayalew, Adane Adugna. "Development of Kaolin Clay as a Cost-Effective Technology for Defluoridation of Groundwater." International Journal of Chemical Engineering 2020 (October 3, 2020): 1–10. http://dx.doi.org/10.1155/2020/8820727.

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Excessive fluoride in potable groundwater is a serious health problem in rural areas of many developing countries. The presence of a small amount of fluoride in potable water is beneficial to human health, but a high amount (>1.5 mg/L) has adverse effects. The present study is aimed to prepare a new cost-effective adsorbent of kaolin clay that can be used as a valuable defluoridating agent. Characterization of the prepared adsorbent was carried out using DSC, FTIR, TGA, and XRD. Also, the surface area of the adsorbent was measured by BET analysis. The clay was activated with concentrated H2

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Singh, Tej Pratap, and Majumder Cb. "REMOVAL OF FLUORIDE USING NEEM LEAVES BATCH REACTOR: KINETICS AND EQUILIBRIUM STUDIES." Asian Journal of Pharmaceutical and Clinical Research 11, no. 3 (2018): 237. http://dx.doi.org/10.22159/ajpcr.2018.v11i3.14080.

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Objective: The aim of this paper is to study the fluoride removal efficiency of the neem leaves low-cost biosorbent for defluoridation of sewage wastewater.Methods: For finding the best operating condition for maximum removal of fluoride, batchwise experiments were performed at different contact times and keeping other parameters to be constant such as pH, initial fluoride concentration, and adsorbent dose. Various kinetic models such as intraparticle diffusion model, Bangham’s model, and Elovich model had been investigated for determining the suitable adsorption mechanism. The rate of adsorpt

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Gayathri, P., A. Xavier, and P. V. Ramachandramoorthi. "Efficient Auramine Yellow Dye Removal using Synthesized Lima Beans Carbon: Kinetic and Isotherm Study." Indian Journal Of Science And Technology 17, no. 48 (2024): 5099–106. https://doi.org/10.17485/ijst/v17i48.3442.

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Objectives: To evaluate the efficacy of chemically synthesized Lima Beans Carbon (LBC) in removing Auramine Yellow (AY) dye from aqueous solutions through adsorption. Methods: LBC was chemically synthesized and characterized using BET isotherm analysis for surface area and pore volume, SEM, EDX, and FTIR for structural insights. Kinetic experiments and various isotherm tests were conducted to validate and evaluate the adsorption process. Findings: The LBC adsorbent demonstrated a high adsorption performance for AY dye removal from aqueous solutions. BET isotherm analysis indicated a suitable s

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Madhukar, M., R. S. Lavanya, and M. B. Amrutha. "Defluoridation and deironing of ground water using polystyrene beads." Water Supply 13, no. 6 (2013): 1507–12. http://dx.doi.org/10.2166/ws.2013.116.

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Ground water accounts for nearly 80% of the rural domestic water needs, and 50% of the urban water needs in India. Ground water gets contaminated because of anthropogenic activities. The incidence of fluoride and iron above permissible levels of 1.5 and 1 mg/L respectively occur in 14 Indian states. Various conventional methods are applied for removal of fluoride and iron but, in recent days owing to increasing eco-friendly alternatives like synthetic polymer resins are being considered. The study was focused on using polystyrene (PS) beads packed media for defluoridation and deironing of wate

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Ismail, Zainab Ziad, and Hala N. Abdlekareem. "Uptake of Fluoride from Water Using Recycled Raw Beef Bone as an Environmently Freindly Waste." Journal of Engineering 19, no. 12 (2023): 1576–85. http://dx.doi.org/10.31026/j.eng.2013.12.07.

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Excessive intake of fluoride, mainly through drinking water is a serious health hazard affecting humans worldwide. In this study, the defluoridation capacities of locally available raw waste beef bones have been estimated. Several experimental parameters including contact time, pH, bone dose, fluoride initial concentration, bone grains size, agitation rate, and the effect of co-existence of anions in actual samples of wastewater were studied for fluoride removal from aqueous solutions. Results indicated excellent fluoride removal effeciency up to 99.7% at fluoride initial concentration of 10 m

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P, Gayathri, Xavier A, and V. Ramachandramoorthi P. "Efficient Auramine Yellow Dye Removal using Synthesized Lima Beans Carbon: Kinetic and Isotherm Study." Indian Journal of Science and Technology 17, no. 48 (2024): 5099–106. https://doi.org/10.17485/IJST/v17i48.3442.

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Abstract <strong>Objectives:</strong> To evaluate the efficacy of chemically synthesized Lima Beans Carbon (LBC) in removing Auramine Yellow (AY) dye from aqueous solutions through adsorption.<strong> Methods:</strong> LBC was chemically synthesized and characterized using BET isotherm analysis for surface area and pore volume, SEM, EDX, and FTIR for structural insights. Kinetic experiments and various isotherm tests were conducted to validate and evaluate the adsorption process. <strong>Findings:</strong> The LBC adsorbent demonstrated a high adsorption performance fo

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Ramanarayanan, Subramaniam, Suneesh Kuruvilla, Sabith Methar, and Pooja Latti. "Defluoridation potential of indigenous thirst-quenching herbal products commonly used in Kerala, India." Environmental Health Engineering and Management 9, no. 4 (2022): 419–24. http://dx.doi.org/10.34172/ehem.2022.45.

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Background: Drinking fluoride-contaminated water is a severe health hazard problem. Fluorosis -both skeletal and dental- is an important clinical and public health problem in about 24 countries including India. The best method to overcome the problem of excess fluoride in drinking water is defluoridation. Adsorption methods are simple, economical, and globally pursued techniques. Thirst-quenching herbal products locally called ‘Dahashamini’ are plant parts that are used during boiling drinking water. Possessing a defluoridation potential is an added benefit. Methods: Two grams of each of dried

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Chen, Yan, Jing Wang, Rong Rong Su, Jia Quan Rao, and Xiao Yan Lin. "Study on Adsorption of Vinasse for Ag⁺." Advanced Materials Research 726-731 (August 2013): 2956–59. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2956.

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Effects of parameters including pH value, temperature, absorbent dosage, initial ion concentration, and absorbed time, on the removal efficiency of Ag+ from aqueous solution were investigated through single factor experiment. Vinasse before and after adsorption were characterized by IR. The maximum removal efficiency of Ag+ on vinasse is 97%. The equilibrium sorption is well demonstrated by Freundlich isotherm model.

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Missaoui, Khaoula, Wided Bouguerra, and Chiraz Hannachi. "Defluoridation of South Tunisian Brackish Water by Alum Coagulation/Flocculation: A Preliminary Work." JOURNAL OF ADVANCES IN CHEMISTRY 5, no. 3 (2017): 727–40. http://dx.doi.org/10.24297/jac.v5i3.6592.

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Fluoride removal from aqueous solution was investigated using the chemical coagulation-flocculation by alum in reason of the efficiency and the simplicity of the process. Preliminary experiments were carried out to study the effect of some operating parameters such as: pH, initial fluoride concentration, coagulant dose, adjuvant coagulation dose, flocculent dose and settling time. Obtained experimental results showed that the treatment of fluoride by alum coagulation causes acidification of the solution. The effect of the initial pH solution on fluoride removal is negligible. Experimental resu

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Adejo, S. O., M. M. Ekwenchi, J. A. Gbertyo, T. Menengea, and J. O. Ogbodo. "Determination of Adsorption Isotherm model best fit for methanol leaf extract of Securinega virosa as corrosion inhibitor for corrosion of mild steel in HCl." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 5 (2014): 2737–42. http://dx.doi.org/10.24297/jac.v10i5.891.

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The adsorption isotherm model best fit of the methanol leaf extract of Securinega virosa as corrosion inhibitor for the corrosion of mild steel in 2 M HCl medium was determined with the assistance of the Adejo-Ekwenchi adsorption isotherm. The corrosion inhibition study was carried out using the weight loss method at the temperature range of 301 K to 313 K. The inhibition efficiency, %IE, of the extract was found to increase with increase in both concentration and temperature. On the account of, R2 this adsorption process well fitted into Langmuir, Freundlich, Temkin isotherm, Flory-Huggins an

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Yadav, Pappu Kumar, and Ajai Singh. "Removal of Fluoride using low-cost materials as an adsorbent." Ecology, Environment and Conservation 29 (2023): 415–17. http://dx.doi.org/10.53550/eec.2023.v29i01s.064.

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In the present work, locally available adsorbents such as Sugarcane Bagasse, Coconut Husk and Rice Husk were tested for defluoridation. The characterizations of the three adsorbents were carried out to study the effect of pH, different doses of adsorbent and variation in initial concentration of fluoride at constant temperature of 30±2 °C on removal efficiency of fluoride. It was observed that as the pH value increased, the removal efficiency increased to some time and later became constant in case of Sugarcane Bagasse at adsorbent dose of 0.5g/100 ml at contact time duration of 75 minutes. Th

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Lamb, Prasad, and Parag Sadgir. "Experimental and Numerical Assessment of Defluoridation of Water by using Low Cost Bioadsorbents." Research Journal of Chemistry and Environment 27, no. 2 (2023): 100–105. http://dx.doi.org/10.25303/2702rjce1000105.

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The present research work focused on experimental and numerical assessment of defluoridation of water by low cost bioadsorbents. The experimentation were performed in batch experiment by using residual concentration of 0.5 to 2.0 ppm in a step of 0.5 ppm with different bioadsorbents such as Amla powder and Orange powder. The bioadsorbent dosages ranging from 10 mg/L to 50 mg/L and contact timings from 30 to 210 min. in a step of 10 mg/L and 30 min. respectively were utilized while performing the experimentation on fluoride. The results of the present study showed that removal of fluoride from

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Huang, Yong Bing, Xiu Ying Liu, Li Li Wang, Xiao Juan Li, and Shu Xin Tu. "Study on Arsenic Removal Efficiency and Mechanism of Titanium Modified Manganese Ore." Advanced Materials Research 356-360 (October 2011): 1061–65. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1061.

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Natural manganese ore is a kind of arsenic removal mineral. It is low-cost and widely available. In order to enhance its removal efficiency and adsorption quantity of arsenic, this paper adopted TiCl4 to modify natural manganese ore and optimized the conditions of modification. The results showed that the best modification condition was: TiCl4 at a concentration of 10 mg•L-1, dipping time of 18h, pH 3.05, reaction time of 60 min; under these conditions, the removal rates of As (Ⅲ) and As (Ⅴ) respectively reached 94.87% and 99.31%, much higher compared with natural manganese ore (82.95% and 77.

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Abualreish, Mustafa Jaip Allah Abdelmageed. "Barite Adsorption Efficiency for Removal of Mannose. Experimental Measurements and Equilibrium Study." Chiang Mai Journal of Science 52, no. 3 (2025): 1–13. https://doi.org/10.12982/cmjs.2025.034.

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Adsorption is a promising and extensively utilized approach for removing organic molecules from aqueous solutions. The present study explores, the potential of barite (BaSO4) as adsorbent for mannose removal from aqueous solutions at 25°C. Spectrophotometric method was used to investigate the interaction of mannose solution with barite crystals at 25°C in two different solutions, in neutral (mannose only) and in an aqueous positively charged (mannose + BaCl2) solutions, (in both solutions the initial mannose concentration varied from 0.16 to 1.0×10−3 mole/l). The adsorption experiments reveal

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Kishore, Medikondu. "Potable Water Defluoridation by Lowcost Adsorbents from <i>Mimosideae </i>Family Fruit Carbons: A Comparative Study." International Letters of Chemistry, Physics and Astronomy 56 (July 21, 2015): 71–81. http://dx.doi.org/10.56431/p-985165.

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Fluoride present in the form of minerals, which dissolves in ground water and contaminates it. This paper deals with the mimosideae family fruit carbons are used for the removal of fluoride by the process of adsorption. The activated carbon was prepared by carbonisation of Enterolobium saman fruit carbon (ESC) and Prosofis juliflora fruit carbon (PJC) in muffle furnace and treated with 2.5 x 10-1M nitric acid and thermally activated in air oven. The activated carbon was characterized and chemical analysis was done by X-ray fluorescence. Batch experiments were carried out to establish the vario

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Priya, C. Geetha, and B. R. Venkatraman. "A STUDY ON THE ADSORPTION OF Ni(II) IONS FROM WASTEWATER USING ACID ACTIVATED ANISOMELES MALABARICA LEAVES." Journal of Advanced Scientific Research 12, no. 03 (2021): 82–88. http://dx.doi.org/10.55218/jasr.202112345.

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In the present investigation, the efficiency of activated carbon prepared from Anisomeles malabarica leaves (AMC) as an adsorbent for the removal of Ni (II) ion was investigated. Anisomeles malabarica leaves were treated with sulphuric acid before adsorption. The influence of various operating conditions such as adsorbent dosage, initial concentration of adsorbate, contact time, pH and temperature were explored in a Batch adsorption technique. The Langmuir, Freundlich and Tempkin isotherm models were used to compute the experimental outcomes. Freundlich Isotherm model were fitted well than tha

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