Study on adsorption performance of coal based activated carbon to radioactive iodine and stable iodine

Zhou, Jiang; Hao, Shan; Gao, Liping; Zhang, Youchen

doi:10.1016/j.anucene.2014.05.028

Cited by 127 publications

(58 citation statements)

References 12 publications

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“…Both AC and KOH-AC showed a combined type-I and -IV N 2 adsorption/desorption isotherms with strong N 2 adsorption at low pressure and obvious hysteresis loop character in the relative pressure range 0.4-0.9, indicating the coexisting of micropores and mesopores. The special surface area calculated from BET model was 1973 m 2 g -1 , higher than that of AC (1292 m 2 g -1 ) and other AC samples derived from coals, walnut shells, and coconut shells [14,15,18]. Besides, both AC and KOH-AC exhibited narrow BJH adsorption plots (Fig.…”

Section: Resultsmentioning

confidence: 93%

“…However, the need of complicated technique and the difficulty in the regeneration after use are the major problems for iodine capture by impregnated porous carbon samples. Besides, in these cases, the reported porous carbon samples exhibited special surface areas in the range of 700-1000 m 2 g -1 with total pore volume lower than 1.0 cm 3 g -1 [14,15,18]. Therefore, the facile fabrication of porous carbon with high special surface areas should be of special interest for iodine capture.…”

Section: Introductionmentioning

confidence: 91%

“…Usually, the high removal efficiency for radioactive iodine of porous carbon samples derived from coals, walnut shells, and coconut shells may be attributed to their excellent porosity as well as the good affinity between iodine species and porous carbons due to the addition of impregnant such as potassium iodide and triethylenediamine, allowing the iodine uptake to occur accompanied not only by the physical adsorption process but also by the specific interaction between adsorbates and impregnants [14,15,18]. However, the need of complicated technique and the difficulty in the regeneration after use are the major problems for iodine capture by impregnated porous carbon samples.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison, porous carbons with abundance, high surface areas, environmental friendliness, and the possibility of tuning their textural and structural characteristics has attracted considerable interest in the removal of radioactive iodine compounds such as methyl iodine at different systems [14][15][16][17][18]. Usually, the high removal efficiency for radioactive iodine of porous carbon samples derived from coals, walnut shells, and coconut shells may be attributed to their excellent porosity as well as the good affinity between iodine species and porous carbons due to the addition of impregnant such as potassium iodide and triethylenediamine, allowing the iodine uptake to occur accompanied not only by the physical adsorption process but also by the specific interaction between adsorbates and impregnants [14,15,18].…”

Section: Introductionmentioning

confidence: 99%

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Capture and reversible storage of volatile iodine by porous carbon with high capacity

et al. 2015

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The capture of iodine using porous materials has attracted considerable interest. In this work, porous carbon with a special surface area of 1973 m 2 g -1 was prepared by simple activation method. As an adsorbent, the adsorption capacity of the resulting porous carbon could reach up to 376 wt% for iodine vapor and 460 mg g -1 for iodine uptake in cyclohexane, which both are among the highest values reported up to now. Taking advantages of its high special surface area, easy preparation, low cost, as well as good regeneration, the resulting porous carbon shows great potential in the removal of radioactive iodine at different states.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Capture and reversible storage of volatile iodine by porous carbon with high capacity

et al. 2015

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“…As concern over pollution increases, the demand for AC increases. AC can be prepared from different raw materials like coal, nutshell and biomass [4,5]. Currently, the production of coal asphalt in China exceeds the demand, resulting in an excess of material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of activated carbon from coal pitch for mercury removal in coal-fired power plants

Zhong

Zhang

et al. 2015

J Therm Anal Calorim

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Activated carbon (AC) is an effective adsorbent that is used in a wide range of applications. This is due to its high adsorption capacity and fast removal rate. This study evaluated processing conditions for synthesizing AC from coal pitch. The objective was to establish what processing conditions produced AC with the best adsorption performance. Factors such as carbonization temperature, activation temperature, steam flow rate and the addition of additives have been studied. A real-time, fixed-bed mercury adsorption system was used to evaluate the AC prepared from coal pitch. Results showed that the temperature and the KOH mixing rate in the carbonization process play an important role in the formation of the functional groups on the surface of the char. Additionally, the temperature and the steam flow rate in the activation process significantly affects AC surface area and pore distribution, important factors relating to mercury adsorption performance.

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Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

2016

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The adsorption process of iodine, a major volatile radionuclide in the off‐gas streams of spent nuclear fuel reprocessing, on hydrogen‐reduced silver‐exchanged mordenite (Ag0Z) was studied at the micro‐scale. The gas‐solid mass transfer and reaction involved in the adsorption process were investigated and evaluated with appropriate models. Optimal conditions for reducing the silver‐exchanged mordenite (AgZ) in a hydrogen stream were determined. Kinetic and equilibrium data of iodine adsorption on Ag0Z were obtained by performing single‐layer adsorption experiments with experimental systems of high precision at 373–473 K over various iodine concentrations. Results indicate approximately 91% to 97% of the iodine adsorption was through the silver‐iodine reaction. The effect of temperature on the iodine loading capacity of Ag0Z was discussed. The Shrinking Core model describes the data well, and the primary rate controlling mechanisms were macro‐pore diffusion and silver‐iodine reaction. © 2016 American Institute of Chemical Engineers AIChE J, 63: 1024–1035, 2017

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Study on adsorption performance of coal based activated carbon to radioactive iodine and stable iodine

Cited by 127 publications

References 12 publications

Capture and reversible storage of volatile iodine by porous carbon with high capacity

Capture and reversible storage of volatile iodine by porous carbon with high capacity

Synthesis of activated carbon from coal pitch for mercury removal in coal-fired power plants

Adsorption of iodine on hydrogen‐reduced silver‐exchanged mordenite: Experiments and modeling

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