Provided are an adsorbent for trapping a radioactive iodine gas generated in a process of oxidizing a nuclear fuel at a high temperature after use and a method of preparing the same, and more particularly, a radioactive iodine gas adsorbent which is formed of bismuth as a main component, thereby exhibiting an excellent radioactive iodine gas trapping capability and an excellent thermal stability after trapping, and a method of preparing the same. An adsorbent for trapping a radioactive iodine gas prepared by a method of preparing an adsorbent for trapping a radioactive iodine gas according to the present disclosure may effectively trap a radioactive iodine off-gas generated in a nuclear fuel pre-treated oxidizing process after use. Particularly, the adsorbent may trap iodine in a larger amount, which is twice or more, than a silver-containing zeolite widely used to trap a radioactive iodine gas, and the trapped iodine forms a stable compound, which is more advantageous for long-term storage. In addition, since an iodine gas is trapped using inexpensive bismuth, instead of expensive silver, in consideration of trapping a large amount of a radioactive iodine gas, the adsorbent has very excellent economic feasibility.

A radionuclide separating system for separating a .sup.213Bi daughter radionuclide from a .sup.225Ac parent radionuclide, the radionuclide separating system comprising: an inlet for loading a liquid solution comprising the .sup.225Ac parent radionuclide onto a column; the column comprising a sorbent material wherein the sorbent material is capable of interacting with the .sup.225Ac parent radionuclide and .sup.213Bi daughter radionuclide so as to allow selective desorption of the .sup.225Ac parent radionuclide and/or the .sup.213Bi daughter radionuclide at a different moment in time; and an outlet for selectively obtaining the .sup.213Bi daughter radionuclide based on the selective desorption of the .sup.225Ac parent radionuclide and the .sup.213Bi daughter radionuclide, wherein the sorbent material is a carbon-based sorbent material.

A radionuclide separating system for separating a .sup.213Bi daughter radionuclide from a .sup.225Ac parent radionuclide, the radionuclide separating system comprising: an inlet for loading a liquid solution comprising the .sup.225Ac parent radionuclide onto a column; the column comprising a sorbent material wherein the sorbent material is capable of interacting with the .sup.225Ac parent radionuclide and .sup.213Bi daughter radionuclide so as to allow selective desorption of the .sup.225Ac parent radionuclide and/or the .sup.213Bi daughter radionuclide at a different moment in time; and an outlet for selectively obtaining the .sup.213Bi daughter radionuclide based on the selective desorption of the .sup.225Ac parent radionuclide and the .sup.213Bi daughter radionuclide, wherein the sorbent material is a carbon-based sorbent material.

Provided is a method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals. According to the method, a metal leaching synergist is prepared through thiol-ene click chemical reaction, which is capable of reacting more effectively with arsenic and metal impurities in the copper smelting soot due to its special chemical structure, thereby improving leaching efficiency; and the cage-like structure of the polysilsesquioxane provides excellent chemical stability, the removal rate of harmful substances in the copper smelting soot can be increased by using the synergist, environmental pollution is reduced, meanwhile, the recovery rate of metal resources is increased, and the requirements of green chemistry and sustainable development are met. The present disclosure realizes the centralized management of As and also realizes the step-by-step recovery of valuable metals such as Cu, Zn, Pb, Bi, and In.

Provided is a method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals. According to the method, a metal leaching synergist is prepared through thiol-ene click chemical reaction, which is capable of reacting more effectively with arsenic and metal impurities in the copper smelting soot due to its special chemical structure, thereby improving leaching efficiency; and the cage-like structure of the polysilsesquioxane provides excellent chemical stability, the removal rate of harmful substances in the copper smelting soot can be increased by using the synergist, environmental pollution is reduced, meanwhile, the recovery rate of metal resources is increased, and the requirements of green chemistry and sustainable development are met. The present disclosure realizes the centralized management of As and also realizes the step-by-step recovery of valuable metals such as Cu, Zn, Pb, Bi, and In.

A method for removing lead-210 (.sup.210Pb) from a metal, the method comprising determining a .sup.210Pb concentration in a metal to be refined; determining an amount of low alpha lead to be added to the metal to be refined from the .sup.210Pb concentration, the low alpha lead having a .sup.210Pb concentration below that of the metal to be refined; forming a doped metal mixture by adding the low alpha lead to the metal to be refined; refining the doped metal mixture to separate at least a portion of the lead in the doped metal mixture to form a refined metal having a .sup.210Pb concentration lower than that of the metal to be refined.

A method for removing lead-210 (.sup.210Pb) from a metal, the method comprising determining a .sup.210Pb concentration in a metal to be refined; determining an amount of low alpha lead to be added to the metal to be refined from the .sup.210Pb concentration, the low alpha lead having a .sup.210Pb concentration below that of the metal to be refined; forming a doped metal mixture by adding the low alpha lead to the metal to be refined; refining the doped metal mixture to separate at least a portion of the lead in the doped metal mixture to form a refined metal having a .sup.210Pb concentration lower than that of the metal to be refined.

Provided is a water-insoluble crosslinked structure with an excellent metal-adsorbing effect. The crosslinked structure is formed by crosslinking a first linear polymer and a second linear polymer. The first linear polymer has a plurality of pendant groups represented by Formula (a). The second linear polymer has a plurality of pendant groups represented by Formula (a). Some of the plurality of pendant groups in the first linear polymer and some of the plurality of pendant groups in the second linear polymer are bonded to each other via a crosslinker. In the formula, ring Z represents a heterocycle containing a nitrogen atom as a heteroatom, R.sup.1 represents a single bond or an alkylene group having from 1 to 10 carbons, and Q.sup.+ represents a counter cation.

##STR00001##

Provided is a water-insoluble crosslinked structure with an excellent metal-adsorbing effect. The crosslinked structure is formed by crosslinking a first linear polymer and a second linear polymer. The first linear polymer has a plurality of pendant groups represented by Formula (a). The second linear polymer has a plurality of pendant groups represented by Formula (a). Some of the plurality of pendant groups in the first linear polymer and some of the plurality of pendant groups in the second linear polymer are bonded to each other via a crosslinker. In the formula, ring Z represents a heterocycle containing a nitrogen atom as a heteroatom, R.sup.1 represents a single bond or an alkylene group having from 1 to 10 carbons, and Q.sup.+ represents a counter cation.

##STR00001##

A method for the synthesis of two-dimensional (2D) bismuth (bismuthene) and a use of this material as a photoredox catalyst are provided. The 2D bismuthene is prepared by a liquid-phase exfoliation of the 3D-layered bismuth. The photoredox catalyst is used for the C-H functionalization reactions for the synthesis of complex molecules under versatile conditions.