Bio-composites development for fluoride adsorption in drinking water

2021 ◽  
Author(s):  
Adriana Robledo Peralta ◽  
Liliana Reynoso Cuevas ◽  
Margarita Sanchez Dominguez ◽  
Maria Teresa Alarcón Herrera ◽  
Sergio Valle Cervantes ◽  
...  
Keyword(s):  
Drinking Water ◽  
Fluoride Adsorption

scholarly journals Sustainable Conversion of Agriculture and Food Waste into Activated Carbons Devoted to Fluoride Removal from Drinking Water in Senegal

2015 ◽  
Vol 8 (1) ◽  
pp. 8 ◽  
Author(s):  
Mohamad M. Diémé ◽  
Maxime Hervy ◽  
Saïdou N. Diop ◽  
Claire Gérente ◽  
Audrey Villot ◽  
...  
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Public Health Problem ◽  
Calcium Content ◽  
Fluoride Removal ◽  
Carbonaceous Materials ◽  
Water Steam ◽  
Surface Areas ◽  
Fluoride Adsorption

<p>The objective of this study was to investigate the production of activated carbons (AC) from cashew shells, and millet stalks and their efficiency in fluoride retention. These agricultural residues are collected from Senegal. It is known that some regions of Sénégal, commonly called the groundnut basin, are affected by a public health problem caused by an excess of fluoride in drinking water used by these populations. The activated carbons were produced by a combined pyrolysis and activation with water steam; no other chemical compounds were added. Then, activated carbonaceous materials obtained from cashew shells and millet stalks were called CS-H<sub>2</sub>O and MS-H<sub>2</sub>O respectively. CS-H<sub>2</sub>O and MS-H<sub>2</sub>O show very good adsorbent features, and present carbon content ranges between 71 % and 86 %. The BET surface areas are 942 m² g<sup>-1</sup> and 1234 m².g<sup>-1</sup> for CS-H<sub>2</sub>O and MS-H<sub>2</sub>O respectively. A third activated carbon produced from food wastes and coagulation-flocculation sludge (FW/CFS-H<sub>2</sub>O) was produced in the same conditions. Carbon and calcium content of FW/CFS-H<sub>2</sub>O are 32.6 and 39.3 % respectively. The kinetics sorption were performed with all these activated carbons, then the pseudo-first equation was used to describe the kinetics sorption. Fluoride adsorption isotherms were performed with synthetic and natural water with the best activated carbon from kinetics sorption, Langmuir and Freundlich models were used to describe the experimental data. The results showed that carbonaceous materials obtained from CS-H<sub>2</sub>O and MS-H<sub>2</sub>O were weakly efficient for fluoride removal. With FW/CFS-H<sub>2</sub>O, the adsorption capacity is 28.48 mg.g<sup>-1 </sup>with r² = 0.99 with synthetic water.</p>

Adsorption of Fluoride by Aligned Carbon Nanotubes Supported Ceria Nanoparticles

2007 ◽  
Vol 121-123 ◽  
pp. 1221-1224 ◽  
Author(s):  
Ze Chao Di ◽  
Yan Hui Li ◽  
Xian Jia Peng ◽  
Zhao Kun Luan ◽  
Ji Liang
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Drinking Water ◽  
Carbon Nanotube ◽  
Fluoride Concentration ◽  
Ceria Nanoparticles ◽  
Adsorption Effect ◽  
Fluoride Adsorption ◽  
Aligned Carbon Nanotubes ◽  
Potential Applications

Ceria nanoparticles supported on aligned carbon nanotubes (CeO2/ACNTs), a novel adsorbent for fluoride from drinking water, were prepared by chemical reaction of CeCl3 with NaOH on aligned carbon nanotube solution and subsequent heat treatment. The best fluoride adsorption effect of CeO2/ACNTs occurs at pH 4.0 ~ 9.0. The largest adsorption capacity of CeO2/ACNTs reaches 33.7 mg g-1 at an equilibrium fluoride concentration of 18.0 mg l-1 at pH 7.0. The experiment results suggest that CeO2/ACNTs have great potential applications in environmental protection.

scholarly journals Fluoride adsorption properties of three modified forms of activated alumina in drinking water

2014 ◽  
Vol 12 (4) ◽  
pp. 715-721 ◽  
Author(s):  
Ying Duan ◽  
Chenchen Wang ◽  
Xuede Li ◽  
Wei Xu
Keyword(s):  
Drinking Water ◽  
Surface Area ◽  
Adsorption Properties ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Activated Alumina ◽  
Fluoride Ions ◽  
Fluoride Adsorption ◽  
Order Kinetic Model ◽  
Chlorine Ions

The study describes the removal of fluoride from drinking water using activated alumina (AA). AA was modified with H2SO4, FeCl3 and a combination of the two to enhance fluoride adsorption. The AA adsorbents were characterized using Brunauer–Emmett–Teller surface area analysis and X-ray fluorescence. The maximum adsorption capacity of H2SO4- and FeCl3-modified AA adsorbents was 4.98 mg/g, which is 3.4 times higher compared with that of normal AA. The results showed that the surface area of AA increased when modified with H2SO4. AA modified with FeCl3 enhanced fluoride adsorption ability through ion-exchange between chlorine ions and fluoride ions. The fluoride adsorption properties of AA modified with both H2SO4 and FeCl3 were consistent with the Langmuir model. The fluoride adsorption kinetics of the adsorbents were well described by the pseudo-second-order kinetic model.

scholarly journals Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Jifa Liu ◽  
Ping Zhao ◽  
Yue Xu ◽  
Xibin Jia
Keyword(s):  
Drinking Water ◽  
Adsorption Capacity ◽  
Mixed Oxide ◽  
Photoelectron Spectroscopy ◽  
Raw Materials ◽  
Molar Ratio ◽  
Fluoride Removal ◽  
Hydroxyl Groups ◽  
X Ray ◽  
Fluoride Adsorption

To make full use of natural waste, a novel Mg-Al mixed oxide adsorbent was synthesized by the dip-calcination method using the fluff of the chinar tree (FCT) and an Mg(II) and Al(III) chloride solution as raw materials. The adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The effects of the Mg/Al molar ratio and calcination temperature on the performance of the novel Mg-Al mixed oxide adsorbent were investigated. The optimized Mg-Al mixed oxide adsorbent had a Langmuir adsorption capacity of 53 mg/g. This adsorption capacity was higher than that of the separate Mg oxide and Al oxide. The synergy between Mg and Al is beneficial to the adsorption performance of the material. The fluoride adsorption capacity of the optimized Mg-Al mixed oxide adsorbent is only slightly affected by ions such as Cl−, NO3−, SO42−, Na+, and K+and is excellent for use in recycling and real water. The hydroxyl groups on the surface of the Mg-Al mixed oxide adsorbent play a key role in the adsorption of fluorine. The as-obtained novel Mg-Al mixed oxide adsorbent is an efficient and environmentally friendly agent for fluoride removal from drinking water.

Removal of Fluoride from Drinking Water by Gel Composite of Metal Ion and Humic Acid Adsorbent

2013 ◽  
Vol 726-731 ◽  
pp. 695-699
Author(s):  
Li Hong ◽  
Si Xiang Wang ◽  
Yong Liu ◽  
Yue Chun Zhang
Keyword(s):  
Drinking Water ◽  
Humic Acid ◽  
Contact Time ◽  
Metal Ion ◽  
Fluoride Removal ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Adsorption Method ◽  
Sem Images ◽  
Fluoride Adsorption

Humic acid adsorbent modified with metal ions was prepared by gel polymerization and named gel composite of metal ion and humic acid, which abbreviated GCMH to uptake fluoride from drinking water. The samples were measured by X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images. Fluoride adsorption onto the synthesized samples was investigated by batch adsorption method. In previous works, detailed studies were carried out to investigate the effect of contact time, adsorbent dose, initial solution pH, temperatures and co-existing anions. The maximum fluoride removal was obtained at pH7. Presence of HCO3− adversely affected the adsorption of fluoride. The optimum absorption conditions were at the dose of 10g/L, temperature of water of 55°Cand contact time of 6hs.

scholarly journals Survey of fluoride adsorption with zeolite activated by La3+ from drinking water

2012 ◽  
Vol 3 (4) ◽  
pp. 63-70
Author(s):  
H Rahmani ◽  
A Rahmani ◽  
K Rahmani ◽  
AH Mahvi
Keyword(s):  
Drinking Water ◽  
Fluoride Adsorption

scholarly journals The Extremely High Adsorption Capacity of Fluoride by Chicken Bone Char (CBC) in Defluoridation of Drinking Water in Relation to Its Finer Particle Size for Better Human Health

Healthcare ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 123 ◽  
Author(s):  
H. Herath ◽  
Tomonori Kawakami ◽  
Masamoto Tafu
Keyword(s):  
Drinking Water ◽  
Adsorption Capacity ◽  
Fluoride Concentration ◽  
Contaminated Water ◽  
Bone Char ◽  
Health Issues ◽  
High Adsorption ◽  
Fluoride Adsorption ◽  
Chicken Bone ◽  
High Fluoride

The ingestion of fluoride-contaminated water causes serious health issues in people all over the world. In the current study, the adsorption of fluoride onto chicken bone char (CBC) was investigated as a defluoridation technique. Finer-sized CBC with a diameter of 106–212 µm was used to investigate the fluoride adsorption capacity onto CBC. Results revealed that finer-sized CBC yielded an unusually high fluoride adsorption capacity of 11.2 mg/g at the equilibrium fluoride concentration of 10 mg/L. The study shows that CBC can be utilized in the defluoridation of drinking water and that finer-sized CBC enhances ion exchange to perform a higher adsorption capacity.

Chemically activated cow bone for increased fluoride removal from drinking water

2016 ◽  
Vol 6 (2) ◽  
pp. 215-223 ◽  
Author(s):  
Teshome L. Yami ◽  
Elizabeth C. Butler ◽  
David A. Sabatini
Keyword(s):  
Drinking Water ◽  
Adsorption Capacity ◽  
Thermal Activation ◽  
Chemical Activation ◽  
Unit Mass ◽  
Fluoride Removal ◽  
Bone Char ◽  
Fluoride Adsorption ◽  
Removal Capacity ◽  
Cow Bone

Thermally activated cow bone is widely utilized for treating fluoride impacted drinking water to meet the World Health Organization guideline value of 1.5 mg/L. However, the fluoride removal capacity of bone char is low, leaving room for further improvement. This study, therefore, strives to improve the fluoride adsorption capacity of cow bone by using chemical activation in place of thermal activation. Chemically activated cow bones (CABs) had, on average, a four-fold higher fluoride adsorption capacity than bone char. Characterization of the most effective CAB were made to explore potential reasons for the increased fluoride adsorption capacity. The X-ray diffraction pattern of the CAB showed formation of bassanite and monetite minerals which may be responsible for the higher fluoride adsorption capacity. Chemical activation is also a lower-cost production process than the thermal activation of cow bone. Further, a higher mass of media was recovered per unit mass of starting material during chemical activation. Therefore, this research shows that increased fluoride removal capacity can be achieved with chemical activation of cow bone while reducing activation costs and greatly increasing product yield per unit mass of starting material, all of which support further evaluation and field testing of this material.

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