Adsorption behavior of some radionuclides on the Chinese weathered coal

Wu, Jianfeng; Xu, Qichu; Bai, Tao

doi:10.1016/j.apradiso.2007.04.004

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…Chinese weathered coal was used to sorb Am(III), Eu(III) and Cs(I) and was reported to have surface area between 1.319 and 19.533 cm 2 g À1 , total pore volume 0.007 and 0.061 cm 3 g À1 and pore size of 9.080 and 16.420 nm at point of zero charge (5.030-6.650). 38 The sorbent has functional oxidized groups (such as carboxyl, hydroxyl, phenol, etc.) with surface charge controlled by pH change.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

“…still being developed and used for treatment of radioactive liquid wastes. 38 Normally, radioactive wastes are classied for effective treatment and management. The classication depends on the characteristics of the radioactive materials present in the wastes, application of radioisotopes, the rate of waste generation and the regulatory frameworks which bound on the disposal of radioactive wastes in a particular place or country.…”

Section: Introductionmentioning

confidence: 99%

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Influence of adsorption parameters on cesium uptake from aqueous solutions- a brief review

et al. 2015

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Due to rapid population growth, technological advancement and industrial revolution, the rate of generated waste effluents has become a grave concern. Cesium which possesses high fission yield is generally transferred to liquid wastes especially those emanated from the nuclear power plants, reprocessing of spent fuels, nuclear weapon testing and radionuclides production facilities for medical applications etc. Radiocesium ( 137 Cs) is one of the hazardous radionuclides creates adverse effects on human health and environment.Due to its physical (T 1/2 =30.17 y) and chemical characteristics (alkalinity, solubility etc.), it can be easily assimilated by the living organisms. As a result, the removal of cesium from wastewater is imperative from the health point of view. Several techniques are implemented but in recent time, adsorption has been gaining increasing attention to the scientific community owing to a number of reasons. Hence, this paper presents an overview on sorption of cesium from wastewaters. Consequently, several critical parameters such as sorption capacity, percentage efficiency and the influence of several factors on cesium uptake by various adsorbents have been reviewed in details. 6 Adsorption/ ion exchange of cesium ions onto synthesized and natural adsorbentsThis is a method by which a sorbate is removed or accumulated on the immobile solid from its liquid or gaseous surroundings, and usually referred to as liquid-solid interaction.Normally, this process occurs at the phase of the sorbent and so, it is a surface-based phenomenon [40] . Adsorption can take different dimensions, if the process is initiated as a result of weak intermolecular forces (Van der Waals interactions) then it is specifically called physisorption and this force being weak in nature results into reversible adsorption, but if occurs due to the formation of chemical bonds between the molecules of adsorbate and the adsorbent it is known as chemosorption. Ion exchange on the other hand is a reversible chemical process in which an ion from solution exchanges with similarly charged ion attached to the adsorbent, the solid particle [40] . Due to their common features, adsorption and ion exchange are grouped together as sorption processes for effective sequester of toxins from waste/drinking waters [41,42] . Adsorption is recognized as an effective and economic method for the removal of radionuclides compared to the other approaches owing to a number of reasons such as; the ease of design and operation, adsorbate-specificity, better treatment with no/little secondary waste generation, possibility of using at low concentration, high efficient performance, ease of regeneration and reuse, suitability for both batch and column studies, and the availability of the adsorbents [43] . Normally, a good adsorbent must have a large surface area, good macroporous structure and be stable under chemical, radiation and thermal reaction conditions. However, the behaviour and efficiency of adsorbents can also be influenced by the condition of the so...

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Section: Effect Of Solution Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of adsorption parameters on cesium uptake from aqueous solutions- a brief review

et al. 2015

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“…There are a lot of other kinds of materials applied for sorption of heavy metal ions from aqueous solutions. Wu et al [67] studied sorption behavior of some radionuclides on the Chinese weathered coal, and found that the weathered coal is an useful and inexpensive sorbent for the removal of Am(III), Eu(III) and Cs(I) from aqueous solutions. The mechanism of Cd(II) sorption by pure calcium carbonate was investigated at laboratory level to examine whether reaction products of phosphate with calcium carbonate serve as a sink for sorption of toxic heavy metal ions like cadmium.…”

Section: Other Materialsmentioning

confidence: 99%

Sorption of Heavy Metal Ions from Aqueous Solutions: A Review

Zhao¹,

Wu²,

Tan³

et al. 2011

TOCOLLSJ

198

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Sorption techniques are widely used to remove heavy metal ions from large volumes of aqueous solutions. Herein, the natural and some artificial materials, such as clay minerals, biosorbents, carbon-nanomaterials, metal oxides, are reviewed as adsorbents in the removal of different heavy metal ions, such as Ni(II), Cu(II), Pb(II), Cd(II), Cs(I), Eu(III), Th(IV), Cr(VI) from large volumes of aqueous solutions. The sorption kinetics and thermodynamics, the influence of environmental factors on the sorption, the possible sorption mechanism of heavy metal ions and the modification of adsorbents on the removal of heavy metal ions are discussed in detail. The sorption properties of the different adsorbents are also described. The different methods such as batch sorption techniques and spectroscopy techniques (such as XPS, FTIR, EXAFS, ATR-IR) in the determination of heavy metal ion sorption properties and sorption mechanisms are presented. Different models for the simulation of sorption isotherms and kinetic sorption data are given as a comparison to understand the sorption mechanism. Many amphibolous matters for further research and the necessity in the study of the selective adsorbents in multi-component sorption systems are also summarized.

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“…The use of the cell surfaces of microorganisms for metal sorption can be visualized as an inexpensive alternative to other metal decontamination processes that include precipitation, ion exchange, dialysis and reverse osmosis etc (Wu et al, 2007;Sun et al, 2014). Thus, the study of low cost effective methods to remove low concentrations of Eu from aqueous solution is desired since the average content of europium is about 2 and 7 wt% for blue and red tricolor phosphors respectively, however, the content depends on the source of the phosphors (Wu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%