Removal of Fluoride from Aqueous Solution Using Chitosan-Iron Complex

Patnaik, Sandeep; Pc, Mishra; Rn, Nayak; Ak, Giri

doi:10.4172/2155-9872.1000326

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…The IR band which appeared at around 1573 cm −1 corresponding to bending vibration of NH 2 was not observed in IR spectrum of GDCLCB/H + and this may be shifted and overlapped by other bands. Similar results were observed in another research [40]. As shown in Fig.…”

Section: Characterization Of the Adsorbent By Sem And Ftirsupporting

confidence: 92%

Solid Polymer Electrolyte Membranes on the Basis of Fluorosiloxane Matrix

Mukbaniani¹,

Aneli²,

Tatrishvili³

et al. 2021

ChChT

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Hydrosilylation reactions of 2,4,6,8-tetrahydro-2,4,6,8-tetramethylcyclotetrasiloxane (D4H) with 2,2,3,3,4,4,5,5-octafluoropentyl acrylate at 1:4.2 ratio of initial compounds catalysed by platinum catalysts have been studied and corresponding adduct D4R' has been obtained. Ring opening polymerization of D4R in the presence of dry potassium hydroxide has been carried out and comb-type polymers with 2,2,3,3,4,4,5,5-octafluoropentyl propionate side groups have been obtained. The synthesized product D4R and polymers were analyzed by FTIR, 1H, 13C, and 29Si NMR spectroscopy. The solid polymer electrolyte membranes have been obtained via sol-gel reactions of polymers with tetraethoxysilane doped with lithium trifluoromethylsulfonate (triflat) and lithium bis(trifluorosulfonyl)imide. It has been found that the electric conductivity of the polymer electrolyte membranes at room temperature changes in the range of (1.9•10-6) – (5.9•10-10) S•cm-1.

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Section: Characterization Of the Adsorbent By Sem And Ftirsupporting

confidence: 92%

Solid Polymer Electrolyte Membranes on the Basis of Fluorosiloxane Matrix

Mukbaniani¹,

Aneli²,

Tatrishvili³

et al. 2021

ChChT

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“…Figure 2 shows that the removal capacity kept decreasing as the dosage increased at all the contact time. The same trend of result was observed by Patnaik et al (2016). The adsorption process was observed to take place in the first 2 minutes contact time of the reaction.…”

Section: Effect Of Adsorbent Dosage On Fluoride Removal Capacitysupporting

confidence: 84%

“…Removal efficiency under different dosage conditions was as shown in Figure 1. Similar trend of removal efficiency was observed by (Patnaik et al, 2016). The removal efficiency was observed to increase from 36.5% to 87.7% with increased adsorbent dosage from 1 to 10 g. The increase in fluoride removal efficiency with increase in the adsorbent dose was due to the increase in surface area; hence more active sites were available for adsorption of fluoride.…”

Section: Effect Of Dosagesupporting

confidence: 81%

Effects of Calcination Temperature of Naturally Occurring Absorbents on Drinking Water Defluoridation

Mndolwa

Mtalo

2020

TJET

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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 and composite ratio of the three adsorbents for the removal of fluoride from natural drinking water with fluoride concentration as high as 16.7 mg/L. The adsorbent materials were calcined at different temperatures ranging between 3500C and 6000C. Batch experiments were performed and samples were collected at different contact time intervals of 2 minutes to 60 minutes, and residual fluoride was determined. Bauxite had the highest fluoride removal efficiency compared to gypsum and magnesite. The best calcination temperatures were 3500C, 4000C, 6000C for gypsum, bauxite and magnesite, respectively. The best calcination temperatures were used to prepare composites at different ratios of 1:2:3, 2:3:1 and 3:2:1, bauxite: gypsum: magnesite respectively. All the ratios gave low sulphate and iron as impurities within the recommended standards. The composites lowered fluoride concentration level to 1.53 mg/L, 2.07 mg/L, 2.60 mg/L for 1:2:3, 2:3:1, 3:2:1 ratios, respectively. In conclusion the study reveals that, it is possible for composites made of adsorbent calcinated at different optimum temperatures to give good results in fluoride removal from drinking water, as well as standard pH, iron and sulphate values in treated water.

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“…The band at 1,632 cm À1 was shifted to 1,631 cm À1 , which was attributed to the presence of -OH groups even after fluoride adsorption onto FeONs (Jayarathna et al 2015;Mohseni-Bandpi et al 2015). The intensity of the band at 1,383 cm À1 was increased sharply, perhaps representing the characteristic peak of fluoride adsorption (Patnaik et al 2016;Liu et al 2018). The results generally indicate that the surface hydroxyl groups play a significant role in fluoride adsorption.…”

Section: Ft-ir Analysismentioning

confidence: 78%

Defluoridation of calcium-rich groundwater using iron oxide nanoparticles

Sudasinghe

Jayaweera

Gunawardana

et al. 2019

Water Practice and Technology

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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 second-order kinetics, indicating monolayer adsorption and chemisorption, respectively. In multi-solute batch-studies, fluoride removal was attributed to adsorption and chemical precipitation forming CaF2 in almost similar magnitude. For calcium removal in multi-solute studies, adsorption, co-precipitation, and precipitation were the prominent mechanisms, with co-precipitation dominant. Thus, FeONs are effective in fluoride removal by adsorption in both the presence and absence of calcium. FeONs could also be used successfully year-round in tropical climates, where calcium levels vary substantially, to lessen the risk of CKDu.

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Removal of Fluoride from Aqueous Solution Using Chitosan-Iron Complex

Cited by 8 publications

References 56 publications

Solid Polymer Electrolyte Membranes on the Basis of Fluorosiloxane Matrix

Solid Polymer Electrolyte Membranes on the Basis of Fluorosiloxane Matrix

Effects of Calcination Temperature of Naturally Occurring Absorbents on Drinking Water Defluoridation

Defluoridation of calcium-rich groundwater using iron oxide nanoparticles

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