A study of the adsorption of iodine and acetic acid from aqueous solutions on characterized porous carbons

Hill, Alfred; Marsh, H.

doi:10.1016/0008-6223(68)90048-1

Cited by 33 publications

(7 citation statements)

References 8 publications

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“…In the case of methylene blue, the molecular areas range between 1.30 and 1.97 nm 2 , , and after short contact times, it can access pores larger than 1.04–1.33 nm . Regarding iodine, its molecular area is 0.40 nm 2 ; therefore, it can access smaller pores than methylene blue . On the basis of this information, ACs from hydrochars and pyrochars have similar pore volumes that are penetrable by methylene blue; on the other hand, pyrochar ACs have a larger number of pores that are accessible for iodine.…”

Section: Resultssupporting

confidence: 69%

“…69 Regarding iodine, its molecular area is 0.40 nm 2 ; therefore, it can access smaller pores than methylene blue. 70 On the basis of this information, ACs from hydrochars and pyrochars have similar pore volumes that are penetrable by methylene blue; on the other hand, pyrochar ACs have a larger number of pores that are accessible for iodine.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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Influence of the Carbonization Process on Activated Carbon Properties from Lignin and Lignin-Rich Biomasses

Correa

Stollovsky

Hehr

et al. 2017

ACS Sustainable Chem. Eng.

137

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Lignin-rich biomass (beech wood, pine bark, and oak bark) and four lignins were tested as precursors to produce activated carbon (AC) via a two-step chemical activation with KOH. First, the precursors were carbonized via either pyrolysis or hydrothermal carbonization, with the purpose of evaluating the influence of the carbonization process on the AC properties. Pyrolysis chars (pyrochars) were thermally more stable than hydrothermal carbonization chars (hydrochars); thus, more AC was yielded from pyrochars (AC yield calculated from the char amount). The difference between ACs from hydrochars and pyrochars was small regarding the AC yield calculated from the initial amount of biomass or lignin. Additionally, no considerable differences in terms of total surface area and surface chemistry were found between both ACs. To understand this, the mechanism of the activation was explained as a local alkali-catalyzed gasification. In the case of hydrochar, carbonization reactions occurred simultaneously to the gasification because of their lower thermal stability. Thus, the carbon content and yields of hydrochar ACs were similar to pyrochar ACs, but their microporous surface areas were lower, likely due to condensation of volatile matter.

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Section: Resultssupporting

confidence: 69%

Section: ■ Results and Discussionmentioning

confidence: 94%

Influence of the Carbonization Process on Activated Carbon Properties from Lignin and Lignin-Rich Biomasses

Correa

Stollovsky

Hehr

et al. 2017

ACS Sustainable Chem. Eng.

137

View full text Add to dashboard Cite

show abstract

“…Particle size was determined using American Standard Test Method (ASTM) sieves (El-Hendawy et al 2001). Iodine number (ASTM D4607-94 2006;Hill and Marsh 1968), decolorizing power (Girgis and ElHendawy 2002;Rozada et al 2005), and other parameters such as apparent density, moisture, loss on ignition, ash, water soluble matter, and acid soluble matter were analyzed by using standard test methods (Namasivayam and Kadirvelu 1997; BIS (Bureau of Indian Standards) 1989).…”

Section: Methodologies Adopted For the Adsorbent Characterization Phymentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

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Background: Deleterious effects of fluoride contamination in ground waters on the health of human beings are well known and intensive research on developing de-fluoridation methods is globally pursued. Of the various methodologies, increasing interest is being envisaged in using the adsorption methods based on active carbons derived from plant material. In the present investigation, Nitric acid activated carbon derived from barks of Vitex negundo plant (NVNC) is probed for its de-fluoridation abilities. Methods: The activated carbon is characterized adopting various physicochemical methods and surface morphological studies are carried out using FT-IR and SEM-EDX techniques. The effect of various parameters such as pH, sorbent dosage, agitation time, initial concentration of fluoride, temperature, particle size and presence of foreign ions on the extraction of the fluoride is studied adopting Batch methods.The adsorption process is analyzed with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherms and kinetics of adsorption is studied using pseudo first-order, pseudo second-order, Weber and Morris intraparticle diffusion, Bangham's pore diffusion and Elovich equations. The methodology developed is applied to real ground water samples.

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“…This technique has been widely employed as a fast test to obtain information regarding the internal surface area of a porous material [ 129 ]. The adsorption mechanism of iodine is like that of N 2 at 77 K: iodine enters micropores by pore filling and mesopores by capillary condensation [ 130 ]. Even though the adsorption mechanisms are similar, there is no direct correlation between BET surface areas calculated from N 2 and CO 2 isotherms and the iodine number.…”

Section: Characterization Of Activated Carbonsmentioning

confidence: 99%

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

Correa

Kruse

2018

Materials

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Even though research on porous carbon materials from biomass dates back to at least hundred years, it is still an extremely relevant topic. These materials can be found in applications that range from those that are widely known, such as water treatment, to others that are newer and indispensable for the transition towards environmentally friendly technologies, such as lithium- and sodium-ion batteries. This review summarizes some of the most relevant research that has been published concerning production technologies, insights on the chemical reaction mechanisms, characterization techniques, as well as some examples of the applications and the properties that the carbon materials must fulfil to be used in those applications.

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A study of the adsorption of iodine and acetic acid from aqueous solutions on characterized porous carbons

Cited by 33 publications

References 8 publications

Influence of the Carbonization Process on Activated Carbon Properties from Lignin and Lignin-Rich Biomasses

Influence of the Carbonization Process on Activated Carbon Properties from Lignin and Lignin-Rich Biomasses

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Biobased Functional Carbon Materials: Production, Characterization, and Applications—A Review

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