Fe(III) and Zr(IV) surface functionalized 1-D hydrogen titanate nanotubes for remediating fluoride from water at neutral pH

Biswas, Anjana; Prathibha, C.

doi:10.1016/j.jwpe.2020.101331

Cited by 9 publications

(18 citation statements)

References 38 publications

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“…In addition, the 2p 1/2 peak also shifted to 463.57 eV. The positive shift in binding energies indicated that the hydroxyl ions bonded to Ti +3 and Ti +4 had taken part in fluoride adsorption . It also proved the successful binding of fluoride ions with Ti.…”

Section: Resultsmentioning

confidence: 86%

“…The intensity of the peaks of M–OH reduced considerably or disappeared in the spectra obtained for fluoride adsorbed CTNC. This was due to the successful exchange of the hydroxyl ions with fluoride ions in water, thus indicating the possibility of an ion exchange mechanism in CTNC. ,, …”

Section: Resultsmentioning

confidence: 92%

“…The positive shift in binding energies indicated that the hydroxyl ions bonded to Ti +3 and Ti +4 had taken part in fluoride adsorption. 30 It also proved the successful binding of fluoride ions with Ti. The deconvoluted high-resolution spectra of Ce 3d as present in pristine CTNC is shown in Figure 12c.…”

Section: Table 2 Parameters Calculated From the Adsorption Isothermsmentioning

confidence: 83%

“…The presence of lower oxidation state (+3) species of Ti and Ce besides their dominant +4 state indicates the presence of defects in the form of oxygen vacancies on the surface of CTNC. These vacant sites lead to formation of activated hydroxyl groups that could serve as additional active sites for fluoride adsorption. ,, Therefore, the numerous surface hydroxyl groups and the defect sites present on CTNC, served as active sites where fluoride adsorption had taken place.…”

Section: Resultsmentioning

confidence: 99%

“…This was due to the successful exchange of the hydroxyl ions with fluoride ions in water, thus indicating the possibility of an ion exchange mechanism in CTNC. 5,6,30 2.3.4.3. XPS.…”

Section: Table 2 Parameters Calculated From the Adsorption Isothermsmentioning

confidence: 99%

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Nanocomposite of Ceria and Trititanate Nanotubes as an Efficient Defluoridating Material for Real-Time Groundwater: Synthesis, Regeneration, and Leached Metal Risk Assessment

Biswas

Prathibha

2021

ACS Omega

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Ceria-incorporated trititanate nanotube composite (CTNC) was synthesized via a simple two-step wet chemical route for efficient fluoride removal not only from synthetic water but also from groundwater. The synthesized nanomaterial was systematically characterized for its physical and chemical properties. CTNC was shown to be highly porous with a surface area of 267 m2/g. The high surface area exposed majority of its adsorption sites, that is, surface hydroxyl groups, for fluoride removal. The plausible adsorption mechanism deduced based on FTIR and XPS data showed that ion exchange between the surface hydroxyl groups and the fluoride ions in water played a vital role in defluoridation by CTNC. A novel approach was used to quantify the adsorption sites with the use of BET and thermogravimetric analysis. TEM images confirmed the morphology of CTNC to be nanotubes decorated with ceria particles. The analysis of treated water samples for the metal ion content was carried out by an ICP-MS technique. CTNC exhibited characteristics of an ideal adsorbent such as high adsorption capacity, faster kinetics, pH independent adsorption, good regeneration, and negligible leaching of metal ions into the effluent. These attractive characteristics enabled the applicability of CTNC for real-time use.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 92%

Section: Table 2 Parameters Calculated From the Adsorption Isothermsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

“…This was due to the successful exchange of the hydroxyl ions with fluoride ions in water, thus indicating the possibility of an ion exchange mechanism in CTNC. 5,6,30 2.3.4.3. XPS.…”

Section: Table 2 Parameters Calculated From the Adsorption Isothermsmentioning

confidence: 99%

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