Effect of natural organic matter on adsorption of ionic and non-ionic pharmaceuticals to granular activated carbon

Oh, Heekyong; Urase, Taro; Simazaki, Dai; Kim, Hyunook

doi:10.37190/epe130402

“…It is, however, prone to colonization by microorganisms as it does not provide bacteriostatic properties [ 21 ]. Typical columns filled with activated carbon need to be frequently replaced or regenerated, which can also be done by including treatment with ozone to eliminate microorganisms that proliferate in the bed volume [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Exceptional Sorption of Heavy Metals from Natural Water by Halloysite Particles: A New Prospect of Highly Efficient Water Remediation

Stor

¹

,

Czelej

²

,

Krasiński

³

et al. 2023

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Halloysite particles, with their unique multilayer nanostructure, are demonstrated here as highly efficient and readily available sorbent of heavy metals that can be easily scaled up and used in large-scale water remediation facilities. The various methods of raw material purification were applied, and their effects were verified using techniques such as BET isotherm (determination of specific surface area and size of pores), XRF analysis (composition), and SEM imaging (determination of morphology). A series of adsorption experiments for aqueous solutions of metal ions (i.e., lead, cadmium) were carried out to quantify the sorption capacity of halloysite particles for selected heavy metals. The ability of adequately activated halloysite to efficiently remove heavy metal ions from water solutions was confirmed. The value of the zeta potential of raw and purified halloysite particles in water was determined. This enables us to understand its importance for the sorption of positively charged ions (metal, organics) at various pH values. The adsorption process conducted in the pH range of 6.0–6.5 showed significant improvement compared to the acidic conditions (pH value 3.0–3.5) and resulted in a high sorption capacity of lead ions—above 24.3 mg/g for the sulphuric acid-treated sample. The atomic scale ab initio calculations revealed a significant difference in adsorption energy between the external siloxane surface and cross-sectional interlayer surface, resulting in pronounced adsorption anisotropy. A low energy barrier was calculated for the interlayer migration of heavy metals into the halloysite interior, facilitating access to the active sites in these regions, thus significantly increasing the sorption capacity and kinetics. DFT (density functional theory) calculations supporting this study allowed for predicting the sorption potential of pure halloysite structure towards heavy metals. To confront it with experimental results, it was crucial to determine proper purification conditions to obtain such a developed structure from the mineral ore. The results show a massive increase in the BET area and confirm a high sorption potential of modified halloysite towards heavy metals.

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“…The advantage of the adsorption over other highly effective methods of removing contaminants is associated with its high versatility against a variety of refractory substances. Furthermore, this process does not generate any by-products and the spent sorbent can be regenerated and reused [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Potential of different materials for adsorption of micropollutants from wastewater

Kamińska¹,

Bohdziewicz²

2016

Environment Protection Engineering

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Performance of various materials such as activated carbons, carbon nanotubes, fullerene, and aluminosilicate for aquatic adsorption of micropollutants has been compared. Micropollutants (bisphenol A (BPA) and nonylphenol (NP)) were removed from artificial effluent which was spiked with standards of those chemicals. It was found that nonylphenol was more favorable adsorbed by all the sorbents than BPA. The higher adsorption capacities for BPA and NP showed single walled carbon nanotubes and activated carbon (AKPA). Slightly lower removal efficiencies of the studied micropollutants were observed for the multi-walled carbon nanotubes and activated carbon SX2. Taking into account the porous structure of the sorbents, it can be concluded that the materials containing mesopores had lower sorption capacities for BPA and NP than materials with microporous structure. Adsorption of micropollutants was much quicker for the carbon nanotubes than for the activated carbon.

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“…The advantage of the adsorption over other highly effective methods of removing contaminants is associated with its high versatility against a variety of refractory substances. Furthermore, this process does not generate any by-products and the spent sorbent can be regenerated and reused [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Potential of different materials for adsorption of micropollutants from wastewater

Kamińska¹,

Bohdziewicz²

2016

Environ. Protect. Eng.

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Performance of various materials such as activated carbons, carbon nanotubes, fullerene, and aluminosilicate for aquatic adsorption of micropollutants has been compared. Micropollutants (bisphenol A (BPA) and nonylphenol (NP)) were removed from artificial effluent which was spiked with standards of those chemicals. It was found that nonylphenol was more favorable adsorbed by all the sorbents than BPA. The higher adsorption capacities for BPA and NP showed single walled carbon nanotubes and activated carbon (AKPA). Slightly lower removal efficiencies of the studied micropollutants were observed for the multi-walled carbon nanotubes and activated carbon SX2. Taking into account the porous structure of the sorbents, it can be concluded that the materials containing mesopores had lower sorption capacities for BPA and NP than materials with microporous structure. Adsorption of micropollutants was much quicker for the carbon nanotubes than for the activated carbon.

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Effect of natural organic matter on adsorption of ionic and non-ionic pharmaceuticals to granular activated carbon

Cited by 3 publications

References 26 publications

Exceptional Sorption of Heavy Metals from Natural Water by Halloysite Particles: A New Prospect of Highly Efficient Water Remediation

Exceptional Sorption of Heavy Metals from Natural Water by Halloysite Particles: A New Prospect of Highly Efficient Water Remediation

Potential of different materials for adsorption of micropollutants from wastewater

Potential of different materials for adsorption of micropollutants from wastewater

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