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Journal articles on the topic 'Defluoridation Efficiency'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

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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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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Gathere, P. W., Sudarno, and A. Sarminingsih. "Increasing The Efficiency of Bone Charcoal in Water Defluoridation Using Eggshell Powder and Dry Banana Peel Medium (DBPM)." IOP Conference Series: Earth and Environmental Science 1098, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1755-1315/1098/1/012026.

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Abstract The world health organization (WHO) has set an upper limit of 1.5 mg/l fluoride concentration in water meant for human consumption. Ground water has high fluoride level which exceeds the value recommended by the WHO. Defluoridation is the only viable way of dealing with the issue of high fluoride levels in water. The most common defluoridation method is the use of bone charcoal. This research shows how adding dry banana peel medium (DBPM) and egg shell powder to bone charcoal increases its defluoridation capacity as well as the water defluoridation rate. Raw water samples were collect

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Li, Lian Xiang, Di Xu, Xian Jun Cheng, Rui Gang Sun, and Xiao Qin Li. "Effect of pH on Four Defluoridation Adsorbents under Natural High Fluoride Groundwater." Applied Mechanics and Materials 643 (September 2014): 335–41. http://dx.doi.org/10.4028/www.scientific.net/amm.643.335.

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Appropriate drinking water defluoridation technology is urgently needed in china, which has a wide fluoride-rich area. The adsorption defluoridation method in the industrial high fluoride wastewater treatment is generally considered to be efficient and economic. However, the practical application of the method is not ideal in obtaining drinking water defluoridation. Four representative adsorbents activated alumina, activated zeolite, hydroxyapatite and hydrous zirconium oxide have been tested in terms of defluoridation efficiency under natural high fluoride groundwater and compared to clarify

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Arora, Aastha, and Rajendra Mathur. "Treatment of Fluoride Contaminated Water Using Coconut Waste as Natural Adsorbent." Ecology, Environment and Conservation 28, no. 04 (2022): 1841–43. http://dx.doi.org/10.53550/eec.2022.v28i04.028.

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The removal of fluoride from groundwater has been researched using a variety of treatment approaches. The adsorption process for defluoridation is widely used in poor nations since it is a technologically and economically viable method that is both environmentally beneficial and simple to implement. As a result, it is necessary to monitor defluoridation using a low-cost and simple technology. This research examines defluoridation using a natural absorbent, coconut husk, which is both inexpensive and effective. The appropriate dose of adsorbent was also determined for improved fluoride removal

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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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7

Premalatha, K., B. Padma, and V. Shashikala. "An Efficient Fluoride Ions Removal from Groundwater by Carbon Alumina Composites Materials." Asian Journal of Chemistry 34, no. 10 (2022): 2697–702. http://dx.doi.org/10.14233/ajchem.2022.23953.

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Due to toxicity, persistent nature, bioaccumulation of fluoride ions and its alarming rise in different parts of India, it has become of utmost importance for the synthesis of an efficient material to remove fluoride ions from groundwater. This article reports the synthesis of highly efficient defluoridation carbon and alumina composite materials (CACM). A series of six samples were synthesized by deposition precipitation method and characterized using various techniques like XRD, BET surface area, pore size distribution, FT-IR, CO2 chemisorption and CO2 temperature programmed desorption (TPD)

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Singh, Neha, Sonu Kumari, and Suphiya Khan. "Improved fluoride removal efficiency using novel defluoridation pencil." Materials Today Communications 28 (September 2021): 102521. http://dx.doi.org/10.1016/j.mtcomm.2021.102521.

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9

Oladoja, N. A., G. A. Bello, S. V. Obisesan, et al. "Insight into the defluoridation efficiency of lateritic soil." Environmental Progress & Sustainable Energy 38, no. 4 (2018): 13107. http://dx.doi.org/10.1002/ep.13107.

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10

Vustelamuri, Padmavathi and Thatavarthi Padmini*. "DEFLUORIDATION OF DRINKING WATER BY VARIOUS BIODEGRADABLE ADSORBENT –A REVIEW." Indo American Journal of Pharmaceutical Sciences 04, no. 08 (2017): 2284–90. https://doi.org/10.5281/zenodo.842832.

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Most of the developing countries like India depend on the groundwater as source of drinking water that may be contaminated by natural sources or by industrial effluents. One such contaminant is fluoride that possesses adverse effects on human health. When people consume water having fluoride (F– ) concentration >1–1.5 mg/L for a long period of time, various ailments that are collectively referred to as fluorosis occur. Various defluoridation technologies are being used to remove fluoride from water but still the problem has not been rooted out. This paper describes the review on the utiliza

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Gupta, Agman, Chelli Sai Manohar, and Belliraj Siva Kumar. "Optimization of cation-doped nano-hydroxyapatite in combination with amorphous aluminum hydroxide for defluoridation." Water Supply 19, no. 6 (2019): 1686–94. http://dx.doi.org/10.2166/ws.2019.041.

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Abstract Given widespread fluoride in the ground water, there is a need for effective defluoridation in several geographical areas. In this regard, we explored heavily doped cationic nano-composites of hydroxyapatite (HA) given its surface chemistry for adsorption of the specific anion. We synthesized and extensively characterized HA nano-rods (HA-NR), Al/Mg-HA nanocomposites and amorphous aluminum hydroxide, and optimized their efficient defluoridation. The kinetics and thermodynamics of adsorption were further evaluated to establish the mechanistic rationale and its spontaneity. We report th

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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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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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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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Zhu, Jiajun, Yaoyao Wang, Yangzhong Zhang, and Kai Huang. "Defluoridation efficiency assessment of spiny hierarchical-structured calcium hydroxyphosphate particles." Colloids and Surfaces A: Physicochemical and Engineering Aspects 627 (October 2021): 127219. http://dx.doi.org/10.1016/j.colsurfa.2021.127219.

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Hildebrant, Benjamin, Arnaud Igor Ndé-Tchoupé, Mesia Lufingo, Tobias Licha, and Chicgoua Noubactep. "Steel Wool for Water Treatment: Intrinsic Reactivity and Defluoridation Efficiency." Processes 8, no. 3 (2020): 265. http://dx.doi.org/10.3390/pr8030265.

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Studies were undertaken to characterize the intrinsic reactivity of Fe0-bearing steel wool (Fe0 SW) materials using the ethylenediaminetetraacetate method (EDTA test). A 2 mM Na2-EDTA solution was used in batch and column leaching experiments. A total of 15 Fe0 SW specimens and one granular iron (GI) were tested in batch experiments. Column experiments were performed with four Fe0 SW of the same grade but from various suppliers and the GI. The conventional EDTA test (0.100 g Fe0, 50 mL EDTA, 96 h) protocol was modified in two manners: (i) Decreasing the experimental duration (down to 24 h) and

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17

Islamuddin*, Rajneesh k. Gautam Shaista Fatima. "REMOVAL OF FLUORIDE FROM DRINKING WATER BY COCONUT HUSK AS NATURAL ADSORBENT." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 10 (2016): 841–46. https://doi.org/10.5281/zenodo.163487.

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High fluoride concentration is a worldwide problem in drinking water due its health effects. In India large population is mainly belong to rural areas which depend on ground water for their drinking purpose. The fluoride concentration in ground water varies from place to place. The data show that the fluoride distribution in ground water varies from 0.01mg/l to 48 mg/l [2]. The fluoride comes into ground water by various ways, for example, weathering of rocks, industrial effluents and geochemical reactions. Traces of fluoride in minute amounts is an essential component for bones and for the fo

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Jia, Chaomin, Yijia Fan, Ruolan Jiang, et al. "Preparation of La(III), Fe(III) Modified Zeolite Molecular Sieves for the Removal of Fluorine from Water." Water 14, no. 19 (2022): 2946. http://dx.doi.org/10.3390/w14192946.

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Excessive fluoride in mine water has become a major concern because it can cause detrimental effects to human health. Nevertheless, the removal efficiency of traditional adsorbents is far from satisfactory. Herein, La and Fe bimetallic supported zeolite was synthesized by co-precipitation method, for efficient defluoridation. The defluoridation performance of La-Fe zeolite was studied by a batch adsorption experiment and dynamic adsorption column test. Results indicated that the removal efficiency of F− was 99.04% under the optimal conditions (4 h, adsorbent dosage 8.0 g/L, agitation rate 200

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Apshankar, Kruttika R., and Sudha Goel. "Defluoridation of Groundwater Using Electrocoagulation and Filtration: Efficiency and Energy Consumption." Journal of Environmental Engineering 143, no. 2 (2017): 04016078. http://dx.doi.org/10.1061/(asce)ee.1943-7870.0001160.

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20

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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Simiyu, Mary T., Francis W. Nyongesa, Bernard O. Aduda, Zephaniah Birech, and Illic Nikolina. "An Assessment of the Use of Static Magnetic Field for Sodium Fluoride Defluoridation and Removal of Escherichia Coli and Rotavirus Pathogens from Water." E3S Web of Conferences 354 (2022): 03002. http://dx.doi.org/10.1051/e3sconf/202235403002.

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The use of chemicals such as chlorine in water purification leaves harmful biproducts in the water while filtration techniques such as reverse osmosis, ultrafiltration, nanofiltration, and forward filtration are costly and require external energy for their operation. Ceramic water filters that would have addressed these issues are brittle and incapable of filtering viruses. In this work, we report on the efficiency of water purification using a 0.8 T static magnetic field from permanent magnets in defluoridation of sodium fluoride and purification of Escherichia coli, and Rotavirus. The contam

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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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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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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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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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Veeraputhiran, Vellasamy, Jeyarajan Helen Ratna Monica, and Vishnu Kiran Manam. "Defluoridation Proficiency of Ocimum tenuiflorum Based Bioadsorbent against Fluoride Toxicity in Drinking Water." Current World Environment 17, no. 2 (2022): 358–65. http://dx.doi.org/10.12944/cwe.17.2.8.

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From the past century, the global attention shifted towards fluoride toxicity through drinking water due to its severity in important health concerns. Many researchers made an attempt to resolve the issue to potable drinking water through many chemical and mechanical methods. Among them adsorption is one of the acceptable cheap and cost-effective method to remove the fluoride from its contaminated waters. This article presents a remarkable defluoridation techniques and approach by preparing efficient bioadsorbent from Holy Basil Ocimum tenuiflorum L. leaves. Thermo-charring method was followed

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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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Dhanasekaran, P., P. M. Satya Sai, C. Anandbabu, and K. K. Rajan. "Defluoridation of water by chemical impregnated Artocarpus hirsutus sawdust." Water Supply 16, no. 5 (2016): 1297–312. http://dx.doi.org/10.2166/ws.2016.032.

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Sawdust of Artocarpus hirsutus impregnated with ferric hydroxide and activated alumina (SFAA) has been studied for defluoridation of water. This paper presents a detailed surface characterization of the adsorbent by studying pore size distribution and surface morphology. By combining the constituents in the right proportion, an adsorbent with a well-developed pore size distribution could be synthesized. The effects of various parameters on fluoride adsorption by SFAA are investigated. The adsorption capacity of SFAA is considerably higher than that of many adsorbents including activated alumin

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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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Grzegorzek, Martyna, and Katarzyna Majewska-Nowak. "The use of electrodialysis with mono-anion permselective membranes for defluoridation." E3S Web of Conferences 44 (2018): 00046. http://dx.doi.org/10.1051/e3sconf/20184400046.

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Water contamination by fluoride is a common problem present in many regions of the world. The excess of fluorine leads to many health issues. For that reason, the World Health Organisation estimated the permissible fluoride concentration to 1.5 mg F-/dm3. In this paper defluoridation process with the use of electrodialysis was described. During research standard cation-exchange (PC-SK) and mono-anion permselctive membranes (PC-MVA) were applied. The current density was equal to 1.72 mA/cm2 (it corresponded with a current intensity equal to 0.11 A) in the course of experiments. The tested solut

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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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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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Oladoja, N. A., M. L. Seifert, J. E. Drewes, and B. Helmreich. "Influence of organic load on the defluoridation efficiency of nano-magnesium oxide in groundwater." Separation and Purification Technology 174 (March 2017): 116–25. http://dx.doi.org/10.1016/j.seppur.2016.10.006.

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Kumar, Pankaj, Chitresh Saraswat, Binaya Kumar Mishra, et al. "Batch technique to evaluate the efficiency of different natural adsorbents for defluoridation from groundwater." Applied Water Science 7, no. 5 (2016): 2597–606. http://dx.doi.org/10.1007/s13201-016-0473-5.

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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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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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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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Etawi, Hossam, Aiman Eid Al-Rawajfeh, Alaa Al-Ma'abreh, et al. "Efficiency and mechanism of water defluoridation by mixtures of Jordanian zeolite, Pozzolana, Feldspar, and Tripoli." DESALINATION AND WATER TREATMENT 125 (2018): 75–80. http://dx.doi.org/10.5004/dwt.2018.22945.

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Oladoja, N. A., G. A. Bello, B. Helmreich, et al. "Defluoridation efficiency of a green composite reactive material derived from lateritic soil and gastropod shell." Sustainable Chemistry and Pharmacy 12 (June 2019): 100131. http://dx.doi.org/10.1016/j.scp.2019.100131.

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R., N. Joshi, M. Popat K., and Bhattacharya A. "Defluoridation performances of tailor-made thin film polyamide composite membranes." Journal of Indian Chemical Society Vol. 91, May 2014 (2014): 917–23. https://doi.org/10.5281/zenodo.5720151.

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Reverse Osmosis Discipline, Council of Scientific and Industrial Research, Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364 021, Gujarat, India <em>E-mail </em>: bhattacharyaamit1@rediffmail.com <em>Fax</em> : 91-278-2567762 <em>Manuscript received online 10 September 2013, revised 18 Novemer 2013, accepted 19 Novemer 2013</em> To set the ball rolling on enhancing life expectancy, it is worthwhile to ensure the access to a life of good quality. Of the factors that make a quality life, fresh water as the ingredients basic to human advancement. A significant step t

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Mndolwa, Brenda, and Felix Mtalo. "Effects of Calcination Temperature of Naturally Occurring Absorbents on Drinking Water Defluoridation." Tanzania Journal of Engineering and Technology 39, no. 2 (2020): 165–76. http://dx.doi.org/10.52339/tjet.v39i2.703.

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Currently, in Tanzania, fluoride removal from drinking water is treated mostly using the bone char method. The method has poor acceptability in some religious communities and also causes water quality deterioration in taste and odour if the bones are not properly prepared. The use of local natural adsorbents as an alternative is feasible with limitations of high levels of other impurities in treated water. Locally available gypsum, magnesite and bauxite were converted to adsorbents through calcination. The study was conducted to determine the removal efficiency, best calcination temperature an

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Marad, Aishwarya P. "The Efficiency of Natural Adsorbents to Remove Fluoride from Drinking Water: A Review." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (2021): 3857–59. http://dx.doi.org/10.22214/ijraset.2021.37213.

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Widespread existence of fluoride above the desirable limit in ground water, reported that 17 states of India are facing endemic fluorosis problem. Excess amount of fluoride is being emitted due to increase in human activities. Businesses release effluents exceptionally stacked with fluoride. The over abundance of fluoride is destructive from numerous points of view this there is a need to cut down the fluoride level to the safe limits. For this reason the treatment of water is done using number of techniques like coagulation and flocculation, ion-exchange, electrochemical methods, nano filtrat

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Díaz, Isabel, Luis Gómez-Hortigüela, Pilar Gálvez, Joaquín Pérez-Pariente, and Jana Ólavsdóttir. "Composite materials based on zeolite stilbite from Faroe Islands for the removal of fluoride from drinking water." American Mineralogist 104, no. 11 (2019): 1556–64. http://dx.doi.org/10.2138/am-2019-7076.

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Abstract In this work, three samples of the zeolite stilbite from the Faroe Islands have been used to prepare zeolite/hydroxyapatite composite materials that have been tested for the removal of fluoride present as geogenic contaminant in underground water. The Faroe Islands are an archipelago in the North Atlantic that have volcanic origins of Paleocene and early Eocene age. Early reports on the presence of zeolites in the Faroe Islands indicate abundance of chabazite, analcite, mesolite, heulandites, and stilbite, with heulandite and stilbite dominant in the northern and northwestern part of

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Abtahi, Mehrnoosh, Ali Koolivand, Sina Dobaradaran, et al. "Defluoridation of synthetic and natural waters by polyaluminum chloride-chitosan (PACl-Ch) composite coagulant." Water Supply 18, no. 1 (2017): 259–69. http://dx.doi.org/10.2166/ws.2017.085.

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Abstract Removal of fluoride from drinking water by polyaluminum chloride-chitosan (PACl-Ch) composite coagulant was studied in a batch system. Two types of PACl-Ch coagulant were synthetized as PACl-Ch I and PACl-Ch II with chitosan to aluminum (Ch:Al) weight ratios of 0.5 and 1.0, respectively, and were used for defluoridation under different operating conditions. The composite coagulants were found to be more efficient than both PACl and chitosan. By an increase in the Ch:Al ratio from 0.5 to 1.0, the composite coagulant provided a little more efficiency of fluoride removal and lower residu

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WANG, Zhangmin, and Xuebin YIN. "Comparison of the defluoridation efficiency of calcium phosphate and chitin in the exoskeleton of Antarctic krill." ADVANCES IN POLAR SCIENCE 23, no. 3 (2013): 149–54. http://dx.doi.org/10.3724/sp.j.1085.2012.00149.

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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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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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Al-Bedoor, A. A., A. E. Al-Rawajfeh, D. M. M. Jaradat, Y. Al-Jaradeen, and A. Al-Obeidein. "Influence of retardation and acceleration of setting time on the efficiency of water defluoridation by calcined gypsum." International Journal of Environmental Science and Technology 14, no. 7 (2017): 1551–58. http://dx.doi.org/10.1007/s13762-017-1259-5.

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Hezron, Timothy Mwakabona, N. Njau Karoli, and Van der Bruggen Bart. "Water-pH phytoremediation: An entrance to exploiting the potential of plant biomass ash in water defluoridation." Algerian Journal of Chemical Engineering 1, no. 1 (2024): 18–29. https://doi.org/10.5281/zenodo.13772001.

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<em>Field application of low-cost biomass ash in water defluoridation is hindered by media-induced contamination in the treated water including pH elevation. This study explored the method for adjusting pH of water using Cyperus plants. Findings reveal that used ash material is calcium rich with concentration of 537.9 gKg-1. The ash water extract was found to be rich in K with concentration of 642.6 gKg-1. The ash material used was found to have faster and sustained fluoride removal, attaining 76% removal efficiency in 30 minutes with slow increase throughout the experimental time of 24 hours.

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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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