Simultaneous Catalysis of Sulfite Oxidation and Uptake of Heavy Metals by Bifunctional Activated Carbon Fiber in Magnesia Desulfurization

Sulfite and heavy metals are crucial pollutants in the slurry produced by flue gas desulfurization. In this study, a novel cobalt-based activated carbon fiber (Co-ACFs) catalyst-adsorbent was synthesized using an impregnation method; this bifunctional catalyst-adsorbent was used in wet magnesia desulfurization for the simultaneous catalytic oxidation of magnesium sulfite and uptake of heavy metal (Hg2+, Cd2+, and Ni2+) ions. The morphology and surface chemistry of ACFs before and after cobalt loading were investigated using various characterization methods. The kinetics on catalytic oxidation of magnesium sulfite was investigated, and the effects of operation conditions on the simultaneous adsorption capacity of heavy metals were examined. Relative to a non-catalysis material, the 40% Co-ACFs material increased the oxidation rate of magnesium sulfite by more than five times. The Langmuir model can describe the adsorption behavior of Co-ACFs on Hg2+, Cd2+, and Ni2+, indicating that the simultaneous uptake of heavy metals is a single-layer adsorption process. The maximum adsorption capacities for Hg2+, Cd2+, and Ni2+ are 333.3, 500, and 52.6 mg/g, respectively. A pseudo-second-order model confirmed that the removal of heavy metals is controlled by the chemisorption process.

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Catalytic oxidation of NO by activated carbon fiber (ACF)

Chemical Engineering Journal ◽

10.1016/j.cej.2005.10.007 ◽

2006 ◽

Vol 116 (1) ◽

pp. 25-37 ◽

Cited By ~ 83

Author(s):

S ADAPA ◽

V GAUR ◽

N VERMA

Keyword(s):

Activated Carbon ◽

Carbon Fiber ◽

Catalytic Oxidation ◽

Activated Carbon Fiber ◽

Oxidation Of No

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Application of Activated Carbon Fiber Coated with Cobalt Oxide in Mercury Removal from Simulated Flue Gas

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.547 ◽

2011 ◽

Vol 356-360 ◽

pp. 547-553

Author(s):

Yong Fa Diao ◽

Jian Dong Ding ◽

Wan Xuan Yu ◽

Yue Zou ◽

Wei Hui Hao

Keyword(s):

Activated Carbon ◽

Carbon Fiber ◽

Catalytic Oxidation ◽

Cobalt Oxide ◽

Flue Gas ◽

Adsorption Properties ◽

Activated Carbon Fiber ◽

Mercury Removal ◽

Measurement Results ◽

Element Mercury

In this paper, cobalt oxide was deposited on the surface of Activated Carbon Fiber (ACF) by adsorption and was then sintered. The effects of cobalt oxide on the properties of ACF were studied by XPS, FTIR, and XRD methods. Mercury removal performance was also investigated. 5% cobalt was well dispersed on the surface of ACF, and a variety of oxygen-containing groups had been enhanced. The chemical functional groups on the surface of ACF were changed to strengthen the adsorption and catalytic oxidation of ACF to the element mercury (Hg0). The measurement results showed that ACF coated with cobalt oxide had higher adsorption properties.

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Competitive Adsorption of Heavy Metals from Aqueous Solution onto Oxidized Activated Carbon Fiber

Water Air & Soil Pollution ◽

10.1007/s11270-018-3906-y ◽

2018 ◽

Vol 229 (8) ◽

Cited By ~ 7

Author(s):

Maria Selene Berber-Mendoza ◽

Jesús Ivan Martínez-Costa ◽

Roberto Leyva-Ramos ◽

Hector Javier Amezquita Garcia ◽

Nahúm Andrés Medellín Castillo

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Activated Carbon ◽

Carbon Fiber ◽

Competitive Adsorption ◽

Activated Carbon Fiber ◽

Oxidized Activated Carbon

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MODIFIED CARBON FIBER. USING THEM TO REMOVE METAL AND ORGANIC IMPURITIES FROM AQUATIC ENVIRONMENTS

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/ivkkt.20186111.9y ◽

1970 ◽

Vol 61 (11) ◽

Author(s):

Elvira R. Valinurova ◽

Gulnaz F. Shaymukhametova ◽

Alena A. Kozhanova ◽

Ekaterina O. Fokina

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Activated Carbon ◽

Carbon Fiber ◽

Carbon Fibers ◽

Heavy Metal Ions ◽

Adsorption Equilibrium ◽

Equilibrium Constants ◽

Activated Carbon Fiber ◽

Graphitized Carbon

The adsorption properties of activated and graphitized carbon fibers to heavy metal ions, phenols and anilines have been studied. It is shown that carbon fibers, modified by oxidation with concentrated nitric and sulfuric acids, quantitatively extract ions of heavy metals from water. The distribution and selectivity coefficients of adsorption of heavy metal ions on an activated carbon fiber and its oxidized samples are calculated, and selectivity series of adsorption are presented. Preliminary treatment of carbon fibers with organic reagents containing heteroatoms-donors of activity and selectivity was carried out. Preliminary application of urea to the surface of the carbon fiber, reduces the time of establishment of adsorption equilibrium from 1.5 - 2 h to 40 min, and increases the recovery of bismuth to 64%. Modification of the carbon fiber with thiourea allows quantitatively (99%) to recover bismuth from water in 20 min. The degree of extraction of tin by modified thiourea fiber increases by 14% and reaches 53%. Molybdenum (VI) and mercury (II) are recovered by activated carbon fiber modified with a 15% solution of thiourea by 80% and 99%, respectively. Modification of the surface of activated and graphitized carbon fibers with C60 fullerenes increases the adsorption capacity of the activated carbon fiber to cadmium ions to 69%, and of graphitized carbon fiber to 64%. From the Langmuir equation rectified in the coordinates of the adsorption isotherms of organic and inorganic adsorbates, the monolayer capacitances and the sorption equilibrium constants are calculated. Static exchange capacities of carbon adsorbents for ions of heavy metals vary in the range from 2.8 to 23.0 mg/g. The adsorption equilibrium constants range from 0.1·103 to 9.0·103. It is shown that the adsorption of phenols and anilines depends on the mutual arrangement of the functional groups in the adsorbate molecules. The adsorption equilibrium constants of para-substituted derivatives of phenol and aniline are somewhat lower than those of meta- and ortho-derivatives, the functional groups of which are bound by intramolecular hydrogen bonds and can’t participate fully in adsorption.

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