Functionalized activated carbon for the adsorptive removal of perchlorate from water solutions

“…At low HDTMA concentration, z-potential of AC-S stays negative and becomes progressively positive with increasing of concentration. 35 The relation between z-potential, surface charge density and the valence of electrolyte ion could be stated in the following equations. 36…”

Section: Zeta Potential and Point Of Zero Chargementioning

confidence: 99%

Enhanced surface activity of activated carbon by surfactants synergism

2019

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“…F400 is widely used for water treatment and often considered as a reference adsorbent in studies on pollutant removal from aqueous solutions (Morlay and Joly, 2009). Prior to the adsorption experiments, the hydrophobic (Mahmudov and Huang, 2014) GAC was sieved through subsequently 600 µm and 700 µm sieves to remove course material and to obtain a narrow size distribution. This fraction of grains between 600 µm and 700 µm was used in the experiments.…”

Section: Powdered and Granular Activated Carbonmentioning

confidence: 99%

Removal of engineered nanoparticles in drinking water treatment processes

Floris

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We passed through earth lightly as water, said Antonio Setzu, as water flowing, springs, from the dip full of the fountain, slides and winds among moss and ferns, down to the roots of the cork oak and almond trees or slips down on the stones, through the mountains and the hills up to the plan, from the streams to the river, slows down towards the swamps and the sea, called by the sun to become vapour and wind dominated cloud and blessed rain. Apart from the madness of killing each other for irrelevant reasons, we were happy. The plants and swamps were fertile, mountains rich of pasture and springs. The food was not lacking even in the years of famine. We did a blood-colored wine, sweet on the palate, and a bearer of happy dreams. On the seventh day of the folding oaks wind month we used met all the nations around the sacred spring, and for seven days and seven nights we ate, drank, we sang and danced in honor of Is. Singing, playing, dancing, grow, harvest, milking, carving, melting, kill, die, singing, playing, dancing was our life. We were happy, apart from the madness of killing each other for insignificant reasons. Passavamo sulla terra leggeri come acqua, disse Antonio Setzu, come acqua che scorre, salta, giù dalla conca piena della fonte, scivola e serpeggia fra muschi e felci, fino alle radici delle sughere e dei mandorli o scende scivolando sulle pietre, per i monti e i colli fino al piano, dai torrenti al fiume, a farsi lenta verso le paludi e il mare, chiamata in vapore dal sole a diventare nube dominata dai venti e pioggia benedetta. A parte la follia di ucciderci l'un l'altro per motivi irrilevanti, eravamo felici. Le piante e le paludi erano fertili, i monti ricchi di pascolo e fonti. Il cibo non mancava neppure negli anni di carestia. Facevamo un vino colore del sangue, dolce al palato e portatore di sogni allegri. Nel settimo giorno del mese del vento che piega le querce incontravamo tutte le genti attorno alla fonte sacra e per sette giorni e sette notti mangiavamo, bevevamo, cantavamo e danzavamo in onore di Is. Cantare, suonare, danzare, coltivare, raccogliere, mungere, intagliare, fondere, uccidere, morire, cantare, suonare, danzare era la nostra vita. Eravamo felici, a parte la follia di ucciderci l'un l'altro per motivi irrilevanti. Passavamo sulla terra leggeri Sergio Atzeni 2.4.6 Discussion overall filtration behaviour under typical full-scale conditions 78 2.5 Conclusion ________________________________________________________________________ 79 Acknowledgement _________________________________________________________________________ 80 References _________________________________________________________________________________ 81 3 Effect of multicomponent fouling during microfiltration of natural surface waters containing nC60 fullerene nanoparticles _________________________________________________ 85 3.1

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“…We functionalized the active electrode with trimethyl quaternary amine moieties by adsorption of the common cationic surfactant cetrimonium bromide (CTAB) on the surfaces of the activated carbon ( Figure 1b). CTAB has been shown to be adsorbed on activated carbon and dramatically increase its capacity to passively adsorb high affinity ions such as perchlorate, [47]- [50] as well as provide surface charges for CDI. [51] We soaked the activated carbon electrodes in aqueous solutions of 10 mM CTAB and 10 mM NaCl overnight with roughly 1.25 g of electrode material per liter of solution.…”

Section: Surfactant Treatment Of Electrode Materialsmentioning

confidence: 99%

Nitrate removal from water using electrostatic regeneration of functionalized adsorbent

Palko

Oyarzun

et al. 2018

Chemical Engineering Journal

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Nitrate is an important pollutant in drinking water worldwide, and a number of methods exist for the removal of nitrate from water including ion exchange and reverse osmosis. However, these approaches suffer from a variety of disadvantages including requirements for supply and disposal of brine used for regeneration in ion exchange and low water recovery ratio for reverse osmosis. Here, we demonstrate the use of high surface area activated carbon electrodes functionalized with moieties having high affinity for adsorption of nitrate from aqueous solution, such as those used in ion exchange. Adsorption of surfactant molecules having a quaternary amine ionic group to the activated carbon surfaces provides functionalization of the surfaces without complex chemistries. The functionalized electrodes have adsorption capacities of about 80 mg NaNO3 per gram of activated carbon material. Unlike a traditional ion exchanger, the functionalized surfaces can be repeatedly regenerated by the application of an electrostatic potential which displaces the bound NO3-while leaving an excess of electronic charge on the electrode. The cell is completed by an inert counter electrode where Faradaic reactions occur during regeneration. Up to approximately 40% of the initial capacity of the electrode is accessible following electrical regeneration.

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Functionalized activated carbon for the adsorptive removal of perchlorate from water solutions

Cited by 24 publications

References 54 publications

Enhanced surface activity of activated carbon by surfactants synergism

Enhanced surface activity of activated carbon by surfactants synergism

Removal of engineered nanoparticles in drinking water treatment processes

Nitrate removal from water using electrostatic regeneration of functionalized adsorbent

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