Efficient removal of fluoride from drinking water using well-dispersed monetite bundles inlaid in chitosan beads

Shen, Chensi; Wu, Liuxi; Chen, Yanhong; Su, Li; Rashid, Sadia; Gao, Yan; Liu, Jianshe

doi:10.1016/j.cej.2016.05.103

Cited by 47 publications

(6 citation statements)

References 46 publications

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“…Biopolymer adsorbents can be modified in a cost-effective and efficient way , for targeted uptake of anions such as fluoride and sulfate along with toxic oxyanions. In particular, modified chitosan-based adsorbents have been used for the adsorptive removal of various waterborne arsenicals, , organic dyes, fluoride anions, ,, phosphate, , molybdate, and vanadate. , Chitosan is a sustainable biopolymer derived from chitin, which is second to cellulose in its abundance among natural polymers. The unique adsorption properties of chitosan relate to its abundant amine and hydroxyl groups within its biopolymer framework that favor variable formation of polycations under mild acidic conditions, which results in favorable anion uptake from water. − Despite the promising adsorption properties of chitosan toward diverse pollutants, its pristine form has limited surface area and mechanical stability in water at acidic conditions .…”

Section: Introductionmentioning

confidence: 99%

“…Biopolymer adsorbents can be modified in a cost-effective and efficient way 12,13 for targeted uptake of anions such as fluoride and sulfate along with toxic oxyanions. In particular, modified chitosan-based adsorbents have been used for the adsorptive removal of various waterborne arsenicals, 14,15 organic dyes, fluoride anions, 12,16,17 phosphate, 18,19 molybdate, and vanadate. 20,21 Chitosan is a sustainable biopolymer derived from chitin, which is second to cellulose in its abundance among natural polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

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Counterion Effects in Metal Hybrid Biopolymer Materials for Sulfate Adsorption: An Experimental and Computational Study

Steiger

Udoetok

Faye

et al. 2021

ACS Appl. Polym. Mater.

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Modification of biomaterials is an active research area in materials and environmental science, where the controlled removal of sulfate is a key goal toward achieving global water security in regions with saline aquifers. In this study, biopolymerbased ternary metal composites (TMCs) were prepared that contain alginate/chitosan/Al(III) with variable counterions: chloride (C), nitrate (N), and sulfate (S), denoted as TMC-C, TMC-N, and TMC-S, respectively. The structure and physicochemical properties of the TMCs were characterized by spectroscopy (NMR, FT-IR, Raman, and XPS) and other complementary methods (thermal gravimetry, potentiometry, and zeta potential) to gain insights on the role of counterion effects related to the adsorption properties of TMCs with inorganic and organic anions in aqueous media. Both equilibrium and dynamic adsorption properties of the TMCs were evaluated with inorganic sulfate (Na 2 SO 4 ) and two types of anionic organic dyes (methyl orange, MO,; and reactive black-5, RB5) at pH 7 and 295 K. A computational study was carried out to evaluate the structural features of the TMCs related to the coordination of sulfate with the TMC-N system. The charge state of the TMCs for the various counterion systems was estimated according to the pH PZC (5.0 to 5.9) and zeta potential (+8.31 to +35.7 mV) of the composites in aqueous media. The presence of variable counterions (chloride, nitrate, and sulfate) revealed the effects on the equilibrium and kinetic uptake of sodium sulfate and RB5. The Sips isotherm model for sulfate adsorption revealed a value of Q e from 87 to 120 mg/g, which depends on the counterion. The uptake of RB5 (Q m = 77 to 208 mg/g) by the TMCs varied over a wider range due to the role of secondary biopolymer adsorption sites. The incorporation of switchable counterions in TMCs offer a low-cost and bottom-up approach for the design of tailored biopolymer adsorbents with tunable anion uptake properties toward organic and inorganic anions in aqueous media.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Counterion Effects in Metal Hybrid Biopolymer Materials for Sulfate Adsorption: An Experimental and Computational Study

Steiger

Udoetok

Faye

et al. 2021

ACS Appl. Polym. Mater.

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“…When the initial F − concentration was 5 or 10 mg L −1 , adsorption equilibrium was reached in 10 or 20 min, and followed pseudo-first-order kinetics; when the initial F − concentration was at a high level, for example 30, 50 and 100 mg L −1 , adsorption equilibrium was achieved in 2 h, following pseudo-second-order kinetics (Table 1). Compared with the equilibrium time of other reported adsorbents [32][33][34], the F adsorption by FeAl-OOH MB was very fast. AlOOH, as the state-of-the-art fluoride adsorbent, was herein selected as the basis for comparison [24].…”

Section: Adsorption Kineticsmentioning

confidence: 77%

Preparation of hollow Fe-Al binary metal oxyhydroxide for efficient aqueous fluoride removal

Wang

Zhang

Lan

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The morphological difference between the outer and inner surface of the hydrogel bead was differentiated. The morphological characteristics of the interior of the bead may be due to the cross-linking process with TPP contrary to Borba et al (2016) and Shen et al (2016) [64,65].…”

Section: Characterization By Scanning Electron Microscopy (Sem)mentioning

confidence: 81%

Synthesis of Chitosan-Polyvinyl Alcohol Biopolymers to Eliminate Fluorides from Water

et al. 2020

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The fluoride content in groundwater varies depending on geological configuration. Fluoride problems tend to occur in places where these minerals are most abundant in rocks. The objective of the present work was to synthesize four biopolymers based on chitosan-polyvinyl alcohol (Ch-PVA) cross-linked with sodium tripolyphosphate pentabasic (TPP) and ethylene glycol diglycidyl ether (EGDE) and determine their ability to remove fluoride from water. The characterization of the Ch-PVA beads was performed by way of Scanning Electron Microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The percentage of humidity and the point of zero charge were determined. The Ch-PVA beads showed a surface area of 63.87 m2 g−1, a pore size of 7.6 nm, a point of zero charge of 7.4, and 98.6% humidity. The kinetic adsorption study was adjusted to the pseudo-second-order model and the adsorption equilibrium data were adjusted to the Freundlich adsorption isotherm, showing a maximum fluoride adsorption capacity of 12.64 mg g−1 at pH 7 and 30 °C, for the beads of Ch-PVA-NaOH-TPP. According to the thermodynamic parameters: −∆G°, +∆H° and −∆S°, fluoride adsorption is spontaneous, endothermic in nature and there is no random energy change in the solid/liquid interface during the adsorption process.

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Efficient removal of fluoride from drinking water using well-dispersed monetite bundles inlaid in chitosan beads

Cited by 47 publications

References 46 publications

Counterion Effects in Metal Hybrid Biopolymer Materials for Sulfate Adsorption: An Experimental and Computational Study

Counterion Effects in Metal Hybrid Biopolymer Materials for Sulfate Adsorption: An Experimental and Computational Study

Preparation of hollow Fe-Al binary metal oxyhydroxide for efficient aqueous fluoride removal

Synthesis of Chitosan-Polyvinyl Alcohol Biopolymers to Eliminate Fluorides from Water

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