A fundamental analysis of the isotherm for the adsorption of phenolic compounds on activated carbon

Furuya, Eiji; Chang, H. T.; Miura, Yusho; Noll, Kenneth E.

doi:10.1016/s1383-5866(96)01001-5

Cited by 121 publications

(62 citation statements)

References 7 publications

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“…Compared to other methods, adsorption technique is widely used for water treatment due to its sludgefree clean operation, economical, availability of wide range of adsorbents and complete removal of phenols from wastewaters. Activated carbons are often used for the removal of organic contaminants from water (Furuya et al 1997). Activated carbons with desired internal surface area, porosity and sorption characteristics can be manufactured by choosing a right kind of precursor or controlling the process conditions.…”

Section: Introductionmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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Coir pith obtained from the coir industry as waste biomass was used to prepare activated carbon by chemical activation using phosphoric acid (H 3 PO 4 ). The influences of activation temperature and lasting time of activation on specific surface areas (SSA) of the activated carbons were observed. Physical characteristics of the activated carbon were investigated using X-ray diffraction (XRD), infrared spectroscopy (IR), surface area analyzer, scanning electron microscopy (SEM), thermal analysis and potentiometric titration. The feasibility of using activated carbon for the removal of phenol (P), p-chlorophenol (PCP) and pnitrophenol (PNP) from water and petroleum refinery industry effluents was investigated. The effects of contact time, adsorbent dose, ionic strength and initial concentration on the adsorption of phenols onto the activated carbon were investigated. The optimum pH for the maximum removal of phenols was 6.0. The equilibrium adsorption data of phenols were correlated to Langmuir and Freundlich isotherm models, the latter being the best fit of the experimental data. Dynamics of the sorption process and mass transfer were investigated using McKay and Urano-Tachikawa models. Adsorption kinetic data fits the Urano-Tachikawa kinetic model. The utility of the adsorbent was tested by using petroleum refinery industry effluent. The adsorbed phenols can be recovered by treatment with 0.1 M NaOH solution.

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Section: Introductionmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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“…The Freundlich parameter 1/n was related to the affinity between the adsorbate and the adsorbent (Furuya et al, 1997). It was presumed that the strength of the affinity between DOX and AC is reflected in the amount of adsorbed DOX.…”

Section: Results and Discussion Adsorption Isotherms Of Aqueous Doxmentioning

confidence: 99%

Adsorption of 1,4-Dioxane from Aqueous Solutions onto Various Activated Carbons

Fukuhara

Iwasaki

Hasegawa

et al. 2011

J. of Wat. & Envir. Tech.

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The behavior of the adsorption of 1,4-dioxane (DOX) in water onto eight different activated carbons (ACs) was studied. All adsorption isotherms obtained using batch-type adsorption measurements, were found to fit a Freundlich equation. The amount adsorbed at an equilibrium concentration of 50 µg/L (q 50 ) was obtained, and its correlation with microporosity and chemical properties of each AC was examined. The AC prepared from sawdust by direct activation adsorbed the most DOX (410 µg/g), while adsorption in the other ACs were in the range of 4.3 -71.1 µg/g. No practical influence of specific surface area on the adsorption of DOX was found. We observed that log q 50 mostly decreased linearly with an increase in mean pore diameter. The concentrations of acidic surface oxides and nitrogen in the ACs affected the hydrophilicity of the adsorbent and impaired q 50 . It was assumed that the main factor for the adsorption of DOX at trace concentration in water was surface chemistry rather than the microporosity of AC.Keywords: activated carbon, adsorption, 1,4-dioxane INTRDUCTIONThe primary applications of 1,4-dioxane (DOX) include its use as an industrial solvent for paints, a surface-treating agent for artificial leather, and as a stabilizer for organochlorine solvents. Large-scale consumption of the chemical leads to environmental pollution. Because of its carcinogenicity, the 2003 World Health Organization (WHO) guidelines for drinking-water quality have recommended a maximum DOX concentration of 0.05 mg/L. In Japan, the DOX standard value for drinking water was set at 0.05 mg/L in 2004, and the same value was established as an environmental quality standard for aquatic environments in 2009. Technology to reduce DOX concentrations in water down to several tenths of a microgram per liter is needed to minimize the effects of DOX on human health. Activated carbon (AC) is widely used for the removal of hydrophobic organic compounds in water. The operation of AC adsorption processes is generally easy, and their performance is reliable. It can be applied to various scales of a treatment plant. In addition, ensuring safety is easier because target compounds are removed by mass transfer. However, it is known that DOX is a hydrophilic compound and is miscible with water in all proportions. The fact suggests that the adsorbability of DOX onto AC is qualitatively low. Therefore, no concrete data for DOX adsorption onto AC has been reported to date. Exploring the adsorption behavior is useful in developing effective treatment technologies for DOX removal. In general, the adsorptive properties of

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“…The date of Kf illustrated the amount of cellulases that adsorbed on the cellulose. Studies show that Kf was related to the molecular size and adsorbate-solvent interactions [43]. SDS-PAGE showed that the molecular size of cellulases increased with the number of PT/S-box units of the recombinants (Figure 2).…”

Section: Adsorption and Desorption Of Wild-type And Mutant Accel12bmentioning

confidence: 99%

The PT/S-Box of Modular Cellulase AcCel12B Plays a Key Role in the Hydrolysis of Insoluble Cellulose

Wang

et al. 2018

Catalysts

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Abstract:Cellulases play key roles in the degradation of lignocellulosic materials. The function and mechanism of the catalytic domain (CD) and carbohydrate-binding module (CBM) of cellulases were earlier revealed by analysis and characterization of protein structure. However, understanding of the catalytic mechanism of the entire enzyme, and the analysis of the catalytic model, were inadequate. Therefore, the linker chain between CD and CBM has been extensively studied to bridge this gap. Cellulase AcCel12B and three mutants with different linker lengths (with no or 1-3 PT/S-box units) were successfully constructed and purified. Results showed that the activity of cellulases on Avicel and regenerated amorphous cellulose (RAC) increased with the number of PT/S-box units. Furthermore, the desorption of AcCel12B and its mutants from RAC and Avicel were significantly different. The energy of desorption of wild-type and mutant AcCel12B from cellulose decreased with the number of PT/S-box units. Thus, AcCel12B containing more PT/S-box units was more easily desorbed and had more opportunity to hydrolyze cellulose than other samples. The number of PT/S-box units in endocellulase affected the desorption of the enzyme, which is possibly responsible for the differences in the activity of wild-type and mutant AcCel12B on Avicel and RAC.

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A fundamental analysis of the isotherm for the adsorption of phenolic compounds on activated carbon

Cited by 121 publications

References 7 publications

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

Adsorption of 1,4-Dioxane from Aqueous Solutions onto Various Activated Carbons

The PT/S-Box of Modular Cellulase AcCel12B Plays a Key Role in the Hydrolysis of Insoluble Cellulose

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