Optimization of the adsorption of diclofenac by activated carbon and the acidic regeneration of spent activated carbon

Genç, Nevim; Durna, Elif; Erkişi, Ezgi

doi:10.2166/wst.2020.577

Cited by 29 publications

(10 citation statements)

References 37 publications

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“…The best fit of DCF adsorption data with the pseudo-second-order kinetic model indicates that the adsorption process correspond to a chemisorption as the rate-limiting mechanism, which occurs by electron sharing or exchange between DCF and active sites/functional groups of the studied adsorbent materials [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

“…This is frequently used for treatment of different diseases, and its large consumption led to its detection in various water resources and wastewater treatment plant effluents [ 24 , 25 ]. This compound generates negative environmental impacts and serious health side-effects, and therefore, the removal of DCF from wastewater and polluted water is imperative [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Development of New Efficient Adsorbent by Functionalization of Mg3Al-LDH with Methyl Trialkyl Ammonium Chloride Ionic Liquid

et al. 2021

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The present paper describes a new way of obtaining an efficient adsorbent material by functionalization of Mg3Al layered double hydroxides (LDH) with methyl trialkyl ammonium chloride-ionic liquid (IL) using two methods: ultrasound and cosynthesis. Layered double hydroxides are good solid support for the functionalization with ionic liquids due to their well-ordered structure. The immobilization of the ILs in suitable solid supports combine the advantages of the ILs with the properties of the solid supports bringing more benefits such as use of lower quantity of ILs and avoiding of ILs loss in the aqua phase which overall decrease the treatment costs. In case of ultrasound method of functionalization is assured a uniform distribution of IL on the solid surface, but through immobilization by cosynthesis due to the tunable properties of LDH, is assured an intercalation of the ILs between the LDH layers. This fact was highlighted by the X-ray diffraction (RXD), scanning electron microscopy (SEM) analyses and Fourier-transform infrared (FTIR) spectroscopy of the obtained adsorbent. The added value brought by the functionalization of Mg3Al with the studied IL was underlined by the adsorption studies conducted in the treatment process of water with diclofenac content. Kinetic, thermodynamic, and equilibrium studies were performed. DCF adsorption onto the studied materials correspond to a chemisorption, the pseudo-second-order kinetic model describing the most accurately the experimental data. DCF adsorption onto the studied materials occurs as a heterogeneous process, with the experimental data fitting best with the SIPS isotherm. The sample obtained through cosynthesis developed a maximum adsorption capacity of 648 mg/g.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of New Efficient Adsorbent by Functionalization of Mg3Al-LDH with Methyl Trialkyl Ammonium Chloride Ionic Liquid

et al. 2021

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“…GAC was regenerated with stirring at 25°C and 1 atm in a 1 g GAC/10 mL dosage for each concentration of the acidic solutions during the selected contact times. This dosage was used to shorten the equilibration time as much as possible [20,21] and to increase the adsorption probability of the solute (acid solutions) aiming for enhanced desorption of adsorbed inorganics. Once the concentration and contact time were found with the optimal desorption effect between analyzed samples, lower dosages were used for dynamic removal/adsorption experiments.…”

Section: Batch Desorption Testsmentioning

confidence: 99%

Chemical Regeneration of Activated Carbon Used in A Water Treatment System for Medical Services

Torres¹,

Sariol²,

Yperman³

et al. 2023

Adv Environ Eng Res

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The chemical regeneration of exhausted granular activated carbon (GAC) from a water treatment plant to produce dialysis water used in hemodialysis treatments for chronic renal disease patients from a general Hospital of Ciego de Avila province, Cuba, was investigated. Activated carbon (AC) exhausted mainly by inorganics (Ca (Ca-chelates), Mg and Na) was regenerated using hydrochloric acid and acetic acid (one regeneration cycle). Solutions of 5%, 10%, 15% and 20%(v/v) as well as four contact times (2 h, 4 h, 6 h and 48 h) for hydrochloric acid and three contact times (2 h, 4 h and 6 h) for acetic acid at 25°C and 1 atm in a dosage of 1 g GAC/10 mL were used. Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES), thermogravimetric analysis (TGA), X-ray absorption technique (XRA) and Scanning Electronic Microscopy (SEM) were used to evaluate the effect of the regeneration on exhausted GAC. Batch and scaled column experiments were developed. Breakthrough curves were obtained to assess the AC’s performances after chemical regeneration. The removal/adsorption capacity towards free chlorine (as disinfection agent) and hardness ions (expressed in mg CaCO<sub>3</sub>/L) was estimated using the area under the breakthrough curves from scaled columns experiments. The hydrochloric acid arises as the best acidic regenerator; using a concentration of 20%(v/v), regenerated GACs using hydrochloric acid showed the highest desorption rate of inorganics as well as a free chlorine removal performance of around 30% concerning the virgin GAC sample. A new GAC management scheme is proposed for GACs used in the medical industry to improve the sustainability and economics of the water treatment process.

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“…Çökelen katı miktarına her bir bağımsız değişkenin yüzde etkisini belirlemek için pareto analizi yapılmıştır. Pareto grafiğinde pozitif yönde etkileyen faktörler portakal rengi, negatif yönde etkileyen faktörler ise mavi renk ile gösterilmektedir [11]. Grafikte Bonferroni Limiti mutlak önemi, t-değeri Limiti ise önemli etki seviyesini göstermektedir.…”

Section: Taguchi Deneysel Tasarımıunclassified

Marmara Denizi Yüzeyinden Toplanan Müsilaj Biyokütlesinin Suyunun Giderilmesi: Koagülasyon ve Santrifüj Proseslerinin Optimizasyonu

Genç

Durna

SAYIN

2021

Aksaray University Journal of Science and Engineering

Self Cite

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The formation of mucilage observed in the sea surface and bottom sediment in the Marmara Sea in the first half of 2021 adversely affected the aquatic ecosystem aesthetically and ecologically. The mucilage layer formed on the surface, which prevents oxygen entering the water, was first removed with sea sweepers and vacuum trucks. Due to the hydrophilic nature of the mucilage removed by vacuum trucks, the high water content limits the application of disposal/recovery processes. Therefore, the water must be removed first. In this study, coagulation and centrifugation processes were applied to remove the water of mucilage biomass collected from the sea surface with vacuum trucks. The coagulation process is optimized to provide a good suspended solids settling rate and low turbidity in the supernatant with low operating cost, while the centrifugation process is optimized to provide low turbidity and low operating cost. Optimization was implemented with the Taguchi Experimental Design approach. In the coagulation process, 85 ml of precipitated solid, 8.28 NTU supernatant turbidity and 0.594 Euro/L operating cost were determined in optimum conditions (FeCl3 dose of 0.5 g/L, pH of 11.5, slow mixing of 30 rpm 5 minute and fast mixing of 100 rpm 5 minutes) has been obtained. In the centrifugation process, 180 NTU supernatant turbidity was obtained at an operating cost of 0.042 euro/L at optimum conditions of centrifugation speed of 3500 rpm for 30 minutes. With the Pareto analysis performed for the coagulation process, it was determined that the most effective parameters in coagulation were fast and slow mixing times and pH.

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Optimization of the adsorption of diclofenac by activated carbon and the acidic regeneration of spent activated carbon

Cited by 29 publications

References 37 publications

Development of New Efficient Adsorbent by Functionalization of Mg3Al-LDH with Methyl Trialkyl Ammonium Chloride Ionic Liquid

Development of New Efficient Adsorbent by Functionalization of Mg3Al-LDH with Methyl Trialkyl Ammonium Chloride Ionic Liquid

Chemical Regeneration of Activated Carbon Used in A Water Treatment System for Medical Services

Marmara Denizi Yüzeyinden Toplanan Müsilaj Biyokütlesinin Suyunun Giderilmesi: Koagülasyon ve Santrifüj Proseslerinin Optimizasyonu

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