Preparation of carbonaceous adsorbents for removal of chloroform from drinking water

Abe, Ikuo; Fukuhara, Tomoko; Maruyama, Jun; Tatsumoto, Hideki; Iwasaki, Satoshi

doi:10.1016/s0008-6223(00)00230-x

Cited by 82 publications

(36 citation statements)

References 4 publications

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“…Adsorption force increases with decreasing pore size (Abe et al, 1983a;Li et al, 2002). A similar result was obtained in the case of chloroform adsorption at 30 µg/L in water (Abe et al, 2001); i.e., the effect of adsorption force was greater than that of the specific surface area. Although DOX is a hydrophilic organic compound, the strong correlation between log q 50 and d, except for AC-D, suggests that the adsorption force between DOX and AC is mainly derived from the London dispersion force, similar to that causing the adsorption of common hydrophobic compounds.…”

Section: Effects Of Microporosity Of the Activated Carbons On Dox Adssupporting

confidence: 77%

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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Section: Effects Of Microporosity Of the Activated Carbons On Dox Adssupporting

confidence: 77%

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 iodine adsorption capacity was determined with the titration method using 0.1 M sodium thiosulfate [12].…”

Section: Surface Characterizationmentioning

confidence: 99%

Utilization of Triacetylcellulose Waste for the Production of Carbonaceous Adsorbents

et al. 2012

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Triacetylcellulose(TAC)-based globular activated carbons having the adsorption capacity comparable with commercial ones have been derived using a carbonization system developed for this purpose. The carbonization of TAC proceeds through a liquid phase causing bubbling due to the emission of the decomposition gases. The phosphorus compounds resulting from the starting material of TAC waste promote the activation reactions to produce micro-pores.

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“…Among these, bamboo is recognized as one of the most popular bioresources, and its adsorption characteristics have been the subject of many studies. 2,3 Silver ions have long been known to have strong inhibitory and bactericidal effects, as well as a broad spectrum of antibacterial activities, 4,5 and silver has therefore been used commercially, taking advantage of these antibacterial properties. 6 Silver-based antibacterial composites have to release Ag + to a pathogenic environment in order to be effective.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Antibacterial Effect of Bamboo Charcoal/Ag on Staphylococcus Aureus and Pseudomonas Aeruginosa

Yang

Lin

et al. 2009

J Chinese Chemical Soc

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Bamboo charcoal supporting silver (BC/Ag) was prepared by activation and chemical reduction. The BC/Ag composites were characterized by silver particle size and distribution, silver ion (Ag + ) release and antibacterial properties. Scanning and transmission electron microscopy (SEM and TEM) showed that the Ag particles were distributed uniformly on the BC matrix. The Ag particle size was found to be less than 150 nm based on TEM. The Ag + release increased initially which was followed by a marginal increase between the 8th and 24th hour. Composites contained higher amounts of silver exhibited a further rise in Ag + release from the 24-hours of storage in water. The antibacterial effects of the BC/Ag composite powders against Pseudomonas aeruginosa and Staphylococcus aureus were assessed from the minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) method, and an excellent antibacterial performance was discovered.

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Preparation of carbonaceous adsorbents for removal of chloroform from drinking water

Cited by 82 publications

References 4 publications

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

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

Utilization of Triacetylcellulose Waste for the Production of Carbonaceous Adsorbents

Preparation and Antibacterial Effect of Bamboo Charcoal/Ag on Staphylococcus Aureus and Pseudomonas Aeruginosa

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