Influence of dissolved organic matter and activated carbon pore characteristics on organic micropollutant desorption

Aschermann, Geert; Zietzschmann, Frederik; Jekel, Martin

doi:10.1016/j.watres.2018.01.015

Cited by 70 publications

(51 citation statements)

References 27 publications

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“…Aer 72 h, the adsorbent was separated using membrane ltration (0.45 mm, cellulose nitrate), as kinetic experiments showed no further adsorption aer that time period. 26 For desorption experiments the suspensions were centrifuged aer 72 h contact time (as described above, without adsorbent removal by ltration), following a method introduced by Aschermann et al 27 95 mL of the solution were removed aer centrifugation and the same volume of desorption solution was added. The desorption solution corresponded to the adsorption solution without the target substances.…”

Section: Experimental Set-upmentioning

confidence: 99%

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

et al. 2019

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Adsorption onto ferric hydroxide is a known method to reach very low residual phosphate concentrations.Silicate is omnipresent in surface and industrial waters and reduces the adsorption capacity of ferric hydroxides. The present article focusses on the influences of silicate concentration and contact time on the adsorption of phosphate to a micro-sized iron hydroxide adsorbent (mGFH) and fits adsorption data to multi-component adsorption isotherms. In Berlin drinking water (DOC of approx. 4 mg L À1 ) at pH 7.0, loadings of 24 mg g À1 P (with 3 mg L À1 initial PO 4 3À -P) and 17 mg L À1 Si (with 9 mg L À1 initial Si) were reached. In deionized water, phosphate shows a high percentage of reversible bonds to mGFH while silicate adsorption is not reversible probably due to polymerization. Depending on the initial silicate concentration, phosphate loadings are reduced by 27, 33 and 47% (for equilibrium concentrations of 1.5 mg L À1 ) for 9, 14 and 22 mg L À1 Si respectively. Out of eight tested multi-component adsorption models, the Extended Freundlich Model Isotherm (EFMI) describes the simultaneous adsorption of phosphate and silicate best. Thus, providing the means to predict and control phosphate removal.Longer contact times of the adsorbent with silicate prior to addition of phosphate reduce phosphate adsorption significantly. Compared to 7 days of contact with silicate (c 0 ¼ 10 mg L À1 ) prior to phosphate (c 0 ¼ 3 mg L À1 ) addition, 28 and 56 days reduce the mGFH capacity for phosphate by 21 and 43%, respectively.

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Section: Experimental Set-upmentioning

confidence: 99%

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

et al. 2019

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“…Activated carbon and clay mineral were two of the rst adsorbents used. [11][12][13][14][15] Due to the porosity, network, and large specic surface structures, they could produce a certain level of Van Edward forces for the deep treatment (e.g., tertiary treatment) of small-sized pollutants in dyeing wastewater, but the direct adsorption of large-sized dyes is very weak, and therefore should be combined with some oxidising substances (e.g., O 3 , ClO 2 , H 2 O 2 , CuO, Fe 2 O 3 , V 2 O 5 , and Fenton reagent) to decompose them, aer which they can be adsorbed. However, the solid wastes of the activated carbon and clay mineral (or solid waste) are slow to self-decompose and therefore still exist in the environment for a long time, which are is likely to cause a secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Homologous–heterogeneous structure control and intelligent adsorption effect of a polycationic gel for super-efficient purification of dyeing wastewater

Song

2019

RSC Adv.

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“…TCH (240 mg L −1 ) loaded ZBAC was desorbed by anhydrous alcohol which was regarded as eluent [34]. Ethanol provided hydrogen bonds that bound to hydrogen bond acceptors on the TCH for separating the TCH from the adsorbent active sites on the ZBAC.…”

Section: Fixed Bed Desorption Experimentsmentioning

confidence: 99%

Adsorption and Desorption Performance and Mechanism of Tetracycline Hydrochloride by Activated Carbon-Based Adsorbents Derived from Sugar Cane Bagasse Activated with ZnCl2

Cai

Tian

et al. 2019

Molecules

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Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl 2 were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m 2 g −1 with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m 3 g −1 , respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g −1 under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by π-π interactions and cation-π bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.Molecules 2019, 24, 4534 2 of 17 has numerous -OH groups, some of which remain in the pyrolysis, while other parts forms new chemically-reactive oxygen functional groups [6]. AC contains not only a benzene ring but also many chemically reactive oxygen functional groups (-OH, -COOH, etc.), which can be used for chemical modification [7]. The -NH 2 group in the TCH can form a π-π interaction and a cation-π bond with the benzene ring on the ZnCl 2 activated bagasse-based activated carbon (ZBAC). During the pyrolysis process, cellulose and hemicellulose in bagasse (about 50 wt% cellulose and 25 wt% hemicellulose) are decomposed at 202 • C to produce levoglucosan (LGA) and anhydrosugar polymers. The isomerization reaction occurs after LGA dehydration which forms other anhydrosugars and furans [8]. The pyrolysis product is polymerized to form activated carbon at 600 • C. The activated carbon produced by direct the pyrolysis of bagasse has a small specific surface area (S BET was about 376.08 m 2 g −1 ), and ZnCl 2 helps to form more porous structures during pyrolysis (S BET was about 831.23 m 2 g −1 ) because ZnCl 2 catalyzes the Scholl condensation reaction during pyrolysis. The above-mentioned macromolecular polycyclic compounds in bagasse form porous structures during pyrolysis at high temperatures [9].However, how activated carbon's effect on the fate of tetracycline hydrochloride (TCH) in water has become a question demanding a quick solution, and few reports have paid attention to the adsorption and desorption behavior and mechanism. Desorption behavior influences not only the fate of TCH in the environment, which is still a primary concern, but also the efficient recycling of the adsorbent [10]. The structure-activity relationship of adsorbents plays a significant component in the adsorption and desorption process....

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Influence of dissolved organic matter and activated carbon pore characteristics on organic micropollutant desorption

Cited by 70 publications

References 27 publications

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

Homologous–heterogeneous structure control and intelligent adsorption effect of a polycationic gel for super-efficient purification of dyeing wastewater

Adsorption and Desorption Performance and Mechanism of Tetracycline Hydrochloride by Activated Carbon-Based Adsorbents Derived from Sugar Cane Bagasse Activated with ZnCl2

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