Standardization of the Boehm titration. Part I. CO2 expulsion and endpoint determination

Goertzen, Sarah L.; Thériault, Kim D.; Oickle, Alicia M.; Tarasuk, Anthony C.; Andreas, Heather A.

doi:10.1016/j.carbon.2009.11.050

Cited by 577 publications

(340 citation statements)

References 24 publications

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“…The main principle of this method is that surface oxygen groups are either acidic or basic moieties that are neutralized by bases and acids, respectively [30]. Prior to analysis, the adsorbent samples were dried in an oven at 110°C for 3 h. For each adsorbent, 0.2 g amounts were placed in stoppered glass flasks and 30 mL of either 0.1 M NaOH or 0.1 M HCl was added.…”

Section: Characterization Of Adsorbentmentioning

confidence: 99%

“…Filtrates containing excesses of NaOH and HCl were titrated with 0.1 M HCl and 0.1 M NaOH, respectively. The numbers of acidic and basic sites were calculated by determining the amounts of NaOH and HCl that reacted with the adsorbents [30]. The specific surface area was calculated from the amount of adsorbed methylene blue at maximum adsorption capacity according to:…”

Section: Characterization Of Adsorbentmentioning

confidence: 99%

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Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

et al. 2016

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Background (Metroxylon spp.) waste is an inexpensive and abundantly available material with the characteristics of a good adsorbent for treating dye from wastewater. We studied the effectiveness of alkali and acid modification in enhancing the adsorption capacity of sago waste. The untreated and treated adsorbent was characterized by FTIR, elemental analysis and BET surface area. The capacity of each adsorbent to adsorb MB was evaluated at different pH values, adsorbent dosage and initial dye concentrations and contact time. Results According to the results obtained, alkali treatment more than doubled the sorption capacity of sago waste by increasing the porosity, surface area and number of adsorption sites. The alkali-treated material also adsorbed significantly more than many known biosorbents. The effects of the initial concentration of methylene blue, solution pH and adsorbent dosage on methylene blue removal are reported. Equilibrium data were best represented by the Langmuir isotherm model with adsorption capacities of 83.5, 212.8 and 36.82 mg/g for untreated, potassium hydroxide-treated and phosphoric acid-treated sago wastes, respectively. The kinetics of adsorption were best described by a pseudo-second-order model (R 2 = 0.999). Conclusions The alkali treatment of sago waste demonstrates the use of a low-cost agricultural waste and a simple modification process to produce an effective adsorbent for removing cationic dye from wastewater.

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Section: Characterization Of Adsorbentmentioning

confidence: 99%

Section: Characterization Of Adsorbentmentioning

confidence: 99%

Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

et al. 2016

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“…The amounts of oxygen functional groups on the surface of graphene were determined by Boehm's titration method (Goertzen et al 2010). For this purpose, 0.2 g of adsorbent was added into 50 mL of the solutions of NaHCO 3 (0.1 N), 2154 Int.…”

Section: Preparation Of Graphenementioning

confidence: 99%

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Goharshadi

Moghaddam

2015

Int. J. Environ. Sci. Technol.

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In the present study, a batch system was used to investigate the adsorption of chromium (VI) ions from an aqueous solution by graphene nanosheets. Graphene is decorated with functional groups containing oxygen such as epoxy and hydroxyl on the basal plane. The large negative charge density available on graphene causes effective adsorption of chromium (VI) ions from aqueous solutions. The adsorption capacity and rate of chromium (VI) ions at different temperatures, adsorbent dosages, initial concentrations, and contact times were evaluated. The kinetic study illustrated that the adsorption of chromium (VI) ions onto graphene obeys the pseudo-second-order model with activation energy of 21.91 kJ mol -1 . The chromium (VI) ions adsorption was well explained using Dubinin-Radushkevich isotherm model. The values of standard enthalpy, entropy, and Gibbs free energy changes at 25°C were calculated as 686.07 kJ mol -1 , 2.38 kJ mol -1 K -1 , and -22.43 kJ mol -1 , respectively. In this work, graphene was prepared via a green method. Transmission electron microscopy, Fourier transform-infrared spectroscopy, energy-dispersive X-ray analysis, powder X-ray diffraction, Boehm's titration, and N 2 adsorption-desorption techniques revealed a high-quality few-layer nanosheets of graphene with surface area and inter-planar spacing of 594.7 m 2 g -1 and 3.6 Å , respectively.

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“…Upon termination of the experiment, carbon black was separated from the suspension by microfiltration and washed with distilled water; after that, pH of its aqueous suspension was measured according to GOST 25699-6.-90 on a pH-150MI instrument (Izmeritelnaya Tekhnika PLC company), and the functional composition was determined by selective neutralization [15,16] and differential potentiometry [17].…”

Section: Methodsmentioning

confidence: 99%

Self-Decomposition of Hydrogen Peroxide on the Surface of Disperse Carbon Black

Razdyakonova¹,

Kokhanovskaya²,

Лихолобов³

2015

RENSIT

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Abstract. The study aimed to compare the catalytic activities of different carbon black grades in the decomposition of hydrogen peroxide and to reveal the properties of carbon black surface affecting the kinetic parameters of the reaction. The catalytic activities of different carbon black grades, both the channel KК354 and the furnace N121, N326, P161, P267-E and P366-E, were compared in the decomposition of hydrogen peroxide to reveal the most essential properties of carbon black surface affecting a kinetic parameter of the reaction -its activation energy. The knowledge of activation energies for the decomposition of hydrogen peroxide by different carbon black grades will allow choosing the most efficient set of available grades for their joint oxidation and optimization of the functional composition of the product and other process variables. The study has shown that a direct relationship between catalytic activity and specific surface area of carbon black is absent. The disturbing factor is the surface roughness. The functionalization mechanism of the carbon black surface upon its oxidation by hydrogen peroxide with co-agents, ozone and singlet oxygen, was considered. The highest oxidation state of carbon black is reached by increasing the content of carboxyl and lactone groups with the use of hydrogen peroxide in a concentration of 30% in the liquid-phase process and air enriched with singlet oxygen.

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Standardization of the Boehm titration. Part I. CO2 expulsion and endpoint determination

Cited by 577 publications

References 24 publications

Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies

Adsorption of hexavalent chromium ions from aqueous solution by graphene nanosheets: kinetic and thermodynamic studies

Self-Decomposition of Hydrogen Peroxide on the Surface of Disperse Carbon Black

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