scholarly journals Separation and preconcentration of molybdenum (VI) ions in aqueous solution using activated carbon as a collector; Determination of molybdenum(VI) in tap-water, river-water and seawater.

1989 ◽  
Vol 38 (10) ◽  
pp. 529-534 ◽  
Author(s):  
Masaru KIMURA ◽  
Chiharu GOTOH ◽  
Momoko TANI
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
River Water ◽  
Tap Water ◽  
Separation And Preconcentration

Polarographic and Voltammetric Determination of Trace Amounts of 3-Nitrofluoranthene

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1571-1587 ◽  
Author(s):  
Karel Čížek ◽  
Jiří Barek ◽  
Jiří Zima
Keyword(s):  
River Water ◽  
Solid Phase ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode ◽  
Separation And Preconcentration

The polarographic behavior of 3-nitrofluoranthene was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a dropping mercury electrode, differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV), both at a hanging mercury drop electrode. Optimum conditions have been found for its determination by the given methods in the concentration ranges of 1 × 10-6-1 × 10-4 mol l-1 (DCTP), 1 × 10-7-1 × 10-4 mol l-1 (DPP), 1 × 10-8-1 × 10-6 mol l-1 (DPV) and 1 × 10-9-1 × 10-7 mol l-1 (AdSV), respectively. Practical applicability of these techniques was demonstrated on the determination of 3-nitrofluoranthene in drinking and river water after its preliminary separation and preconcentration using liquid-liquid and solid phase extraction with the limits of determination 4 × 10-10 mol l-1 (drinking water) and 2 × 10-9 mol l-1 (river water).

Polarographic and voltammetric determination of genotoxic nitro derivatives of quinoline using mercury electrodes

2011 ◽  
Vol 76 (12) ◽  
pp. 1991-2004 ◽  
Author(s):  
Vlastimil Vyskočil ◽  
Ivan Jiránek ◽  
Aleš Daňhel ◽  
Jiří Zima ◽  
Jiří Barek ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
River Water ◽  
Mercury Electrode ◽  
Differential Pulse ◽  
Dropping Mercury Electrode ◽  
Separation And Preconcentration ◽  
Nitro Derivatives ◽  
Pulse Voltammetry ◽  
Derivatives Of

Electrochemical behavior of genotoxic nitro derivatives of quinoline, namely 5-nitroquinoline (5-NQ), 6-nitroquinoline (6-NQ) and 8-nitroquinoline (8-NQ), was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a classical dropping mercury electrode (DME), and by differential pulse voltammetry (DPV) and adsorptive stripping differential pulse voltammetry (AdSDPV), both at a miniaturized hanging mercury drop minielectrode (HMDmE), in buffered aqueous (for 5-NQ) or aqueous-methanolic (for 6-NQ and 8-NQ) solutions. Optimum conditions were found for the determination of 5-NQ, 6-NQ and 8-NQ by DCTP at DME (with limits of quantification, LQ ≈ 9 × 10–7, 3 × 10–7 and 2 × 10–6 mol l–1, respectively), by DPP at DME (LQ ≈ 1 × 10–8, 9 × 10–8 and 1 × 10–7 mol l–1, respectively), by DPV at HMDmE (LQ ≈ 2 × 10–8, 1 × 10–7 and 1 × 10–7 mol l–1, respectively), and by AdSDPV at HMDmE (LQ ≈ 1 × 10–8 mol l–1 for 8-NQ; an attempt at increasing the sensitivity using AdSDPV at HMDmE was not successful for 5-NQ and 6-NQ). Practical applicability of the developed methods was verified on the direct determination of the studied compounds in model samples of drinking and river water in submicromolar concentrations and on the determination in model samples of drinking and river water using preliminary separation and preconcentration by solid phase extraction (SPE) in nanomolar concentrations.

scholarly journals Parabens Adsorption onto Activated Carbon: Relation with Chemical and Structural Properties

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4313 ◽  
Author(s):  
Astrid Roxanna Moreno-Marenco ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Surface Area ◽  
Endocrine Disruptor ◽  
Emerging Contaminants ◽  
Activated Carbons ◽  
Elaeis Guineensis ◽  
Acid Sites ◽  
Co2 Atmosphere

Parabens (alkyl-p-hidroxybenzoates) are antimicrobial preservatives used in personal care products, classified as an endocrine disruptor, so they are considered emerging contaminants. A raw version of activated carbons obtained from African palm shell (Elaeis guineensis) modified chemically by impregnation with salts of CaCl2 (GC2), MgCl2 (GM2) and Cu(NO3)2 (GCu2) at 2% wt/v and carbonized in CO2 atmosphere at 1173 K was prepared. The process of adsorption of methyl (MePB) and ethylparaben (EtPB) from aqueous solution on the activated carbons at 18 °C was studied and related to the interactions between the adsorbate and the adsorbent, which can be quantified through the determination of immersion enthalpies in aqueous solutions of corresponding paraben, showing the lowest-value carbon GM2, which has a surface area of 608 m2 × g−1, while the highest values correspond to the activated carbon GCu2, with a surface area of 896 m2 × g−1 and the highest content of surface acid sites (0.42 mmol × g−1), such as lactonic and phenolic compounds, which indicates that the adsorbate–adsorbent interactions are favored by the presence of these, with interaction enthalpies that vary between 5.72 and 51.95 J × g−1 for MePB adsorption and 1.24 and 52.38 J × g−1 for EtPB adsorption showing that the process is endothermic.

scholarly journals A Study of the Interactions of Activated Carbon-Phenol in Aqueous Solution Using the Determination of Immersion Enthalpy

2018 ◽  
Vol 8 (6) ◽  
pp. 843 ◽  
Author(s):  
Ana Carvajal-Bernal ◽  
Fernando Gómez-Granados ◽  
Liliana Giraldo ◽  
Juan Moreno-Piraján
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Immersion Enthalpy

scholarly journals Removal of phenolic compounds from aqueous solution by activated carbon cloths

1999 ◽  
Vol 39 (10-11) ◽  
pp. 201-205 ◽  
Author(s):  
C. Brasquet ◽  
E. Subrenat ◽  
P. Le Cloirec
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Phenolic Compounds ◽  
Breakthrough Curves ◽  
Batch Reactors ◽  
Pressure Drops ◽  
Adsorption Capacities ◽  
Kinetic Coefficients ◽  
Initial Adsorption

Granular activated carbon (GAC) is easily used in water or wastewater treatment in order to remove organic micropollutants. Recently, a new presentation of activated carbon has been developed: fibrous activated carbon in the form of cloth or felt. This work investigates the adsorption onto activated carbon cloths (ACC) of various phenolic compounds from aqueous solution. Experiments were carried out in batch reactors with two ACCs (called CS 1501 and RS 1301) and their performances were compared with those of GAC. Initial adsorption kinetic coefficients were higher with fibers than with granules due to the direct connection of micropores to the external surface of fibers. Adsorption isotherms were also performed and modelized by Langmuir and Freundlich equations. Adsorption capacities were similar or higher with ACCs than with GAC. The behaviour of the ACC CS 1501 was also studied in a dynamic reactor. The breakthrough curves allowed the determination of high maximum adsorption capacities, 117 mg.g−1 for phenol. Pressure drops in ACC beds were measured and the influence of various parameters was shown: the activation step, the number of fabric layers, the space between two layers.

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