Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Sabah, Eyüp; Ouki, Sabeha K.

doi:10.1016/j.minpro.2017.03.005

Cited by 18 publications

(4 citation statements)

References 103 publications

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“…At this pH value, the surface has zero charge, while at pH values below and above the pH PZC , it is positively and negatively charged, respectively. This pH PZC value is considered very high when compared to published data [21,22]. Acid and basic buffering capacities of both adsorbents were around 8.5 and 9.5, respectively.…”

Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 51%

“…N 2 adsorption-desorption isotherms obtained for sepiolite and S-Fe are depicted in Supplementary Material (Figure S1). From this figure, it can be noticed that the adsorption isotherms are of type II regarding the classification of the International Union of Pure and Applied Chemistry (IUPAC) and have a hysteresis shape to a certain degree [22,27]. Thus, these adsorbents behave as porous media assembling macropores and mesopores with fewer micropores [25].…”

Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 98%

“…Thus, these adsorbents behave as porous media assembling macropores and mesopores with fewer micropores [25]. Moreover, there is no parallelism between the relative pressure axis and the saturation plateau, which indicates that the adsorbents have a large portion of mesopores [22]. The hysteresis loop belongs to type H3; therefore, slit-shaped pores are expected [28].…”

Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 99%

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Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

et al. 2020

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This research proposes the application of iron-loaded sepiolite (S-Fe) as a catalytic adsorbent for the unreported 1-butylpyridinium chloride ([bpy] Cl) treatment in an aqueous medium. Initially, sepiolite was selected as an inexpensive and efficacious adsorbent for [bpy] Cl elimination. After that, sepiolite was loaded with iron for the subsequent electro-Fenton (EF) regeneration treatment. Once kinetic and isotherm studies were performed, providing respectively almost instantaneous adsorption (20 min) and an uptake of 22.85 mg/g, [bpy] Cl adsorption onto S-Fe was studied in continuous mode. The obtained breakthrough curve was analyzed using three standard breakthrough models, being Yoon–Nelson and Thomas the most suitable adjustments. Afterwards, S-Fe regeneration by the EF process was conducted using this iron-loaded silicate material as a heterogeneous catalyst. Under optimized operational conditions (current intensity 300 mA and Na2SO4 0.3 M), complete adsorbent regeneration was achieved in 10 h. The total mineralization of [bpy] Cl was reached within 24 h and among seven carboxylic acids detected, oxalic and acetic acids seem to be the primary carboxylic acids produced by [bpy] Cl degradation. Finally, S-Fe was efficiently used in four consecutive adsorption–regeneration cycles without a noticeable reduction in its adsorption capacity, opening a path for future uses.

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Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 51%

Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 98%

Section: Catalytic Adsorbent Preparation and Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

et al. 2020

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“…Re cently, sepio lite min er als have been stud ied ex ten sively be cause it is a very im por tant group of min er als with a huge num ber of in dus trial ap pli ca tions [6][7][8][9][10][11]. How ever, ac cord ing to our lit er a ture re search, there is no study about the radionuclide con tents of sepio lite sam ples un til now.…”

Section: Introductionmentioning

confidence: 99%

Radiometric properties of sepiolite minerals from quarries in central Anatolia of Turkey

et al. 2019

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Sepio lite is a nat u rally oc cur ring clay min eral of sed i men tary or i gin and is a mag ne sium hydrosilicate. Sepio lite has been widely used as an ad di tive raw ma te rial in ce ram ics and cement in dus try, phar ma ceu ti cal, clean ing-de ter gent, pa per, paint, cos metic ag ri cul ture, fer tilizer, etc. In this study, the nat u ral ra dio ac tiv ity lev els, ra don em a na tion co ef fi cients and ra don ex ha la tion rates of 30 sepio lite sam ples col lected from open three sepio lite quar ries (Beylikova, Polath and Sivrihisar) in Cen tral Anatolia re gion of Tur key were de ter mined by us ing a gamma-ray spec trom e try with an HPGe de tec tor. The av er age ab sorbed gamma dose rates di rectly mea sured in Beylikova, Polath and Sivrihisar open three sepio lite quar ries located in Cen tral Anatolia re gion of Tur key were found as 59, 65, and 64 nGyh-1 , re spec tively. The av er age ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in 30 sepio lite sam ples col lected from those quar ries were found as 38.6, 12.4, and 67.4 Bqkg-1 , re spec tively. The av er age ema na tion co ef fi cient and ex ha la tion rate of ra don of sepio lite sam ples were de ter mined as 22 % and 0.065 Bqkg-1 h-1 , re spec tively. Also, ra dio log i cal pa ram e ters (out door ab sorbed gamma dose rate, an nual ef fec tive dose rate, ex ter nal and in ter nal in dex) were es ti mated to eval u ate the use of sepio lite sam ples as ad di tive raw ma te ri als in the build ing sec tor. Key words: sepio lite, nat u ral ra dio ac tiv ity, out door ab sorbed gamma dose rate, ra don em a na tion co ef fi cient, ra don mass ex ha la tion rate, gamma-ray spec trom e try

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PBAT/hybrid nanofillers composites—Part 1: Oxygen and water vapor permeabilities, UV barrier and mechanical properties

Calderaro

Sarantópoulos

Sánchez³

et al. 2020

J of Applied Polymer Sci

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This work evaluated the effect of the combination of nanofillers: organically modified montmorillonite (MMT), sepiolite (SEP) and nano titanium dioxide (TiO2) on the oxygen and water vapor permeability coefficients, light transmission and mechanical properties of poly(butylene adipate‐co‐terephthalate) (PBAT) aiming at packaging application. The clays concentrations were chosen considering percolation threshold from the clays aspect ratio by TEM analyses. Comparing to neat PBAT, oxygen and vapor permeability coefficients showed reduction with the increase of MMT while SEP and nano‐TiO2 did not show significant influence. However, nano‐TiO2 was the only filler able to reduce UV and visible light transmission. Nanofillers and their combinations showed to be statistically significant for the increase in Young's modulus, although the tensile strength and elongation showed no influence. The results were discussed in terms of the fillers' morphology and dispersion. Nielsen's model was applied to estimate the aspect ratio of the MMT in nanocomposites.

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Sepiolite and sepiolite-bound humic acid interactions in alkaline media and the mechanism of the formation of sepiolite-humic acid complexes

Cited by 18 publications

References 103 publications

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

Iron-Loaded Catalytic Silicate Adsorbents: Synthesis, Characterization, Electroregeneration and Application for Continuous Removal of 1-Butylpyridinium Chloride

Radiometric properties of sepiolite minerals from quarries in central Anatolia of Turkey

PBAT/hybrid nanofillers composites—Part 1: Oxygen and water vapor permeabilities, UV barrier and mechanical properties

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