SBA-15 templating synthesis of mesoporous bismuth oxide for selective removal of iodide.

Title SBA-15 templating synthesis of mesoporous bismuth oxide for selective removal of iodide.
Authors L. Zhang; M. Jaroniec
Journal J Colloid Interface Sci
DOI 10.1016/j.jcis.2017.04.063
Abstract

Mesoporous ?-Bi2O3 samples with high surface area and small crystallite sizes were prepared by using different SBA-15 silicas as hard templates. The latter were synthesized hydrothermally using tetraethylorthosilicate (TEOS), sodium metasilicate (SMS), and water glass (WG) as silica sources. The resulting SBA-15 silicas showed high surface area and pore volume. Among SBA-15 samples studied, the WG-generated SBA-15 exhibited the thinnest pore walls and lowest percentage of complementary pores. Interestingly, SBA-15 obtained from WG gave ?-Bi2O3 with the highest surface area and pore volume. This mesoporous ?-Bi2O3 was applied for the removal of iodide from aqueous solutions and was able to adsorb 2.87mmol/g of iodide at ambient conditions. In addition, mesoporous ?-Bi2O3 displayed high selectivity for iodide removal in the presence of chloride. Due to the high toxicity of the radioactive isotopes of iodine, this substance is required to be immobilized before its release to environment. This work presents a promising sorbent for selective capture of iodide from aqueous solutions.

Citation L. Zhang; M. Jaroniec.SBA-15 templating synthesis of mesoporous bismuth oxide for selective removal of iodide.. J Colloid Interface Sci. 2017;501:248255. doi:10.1016/j.jcis.2017.04.063

Related Elements

Bismuth

See more Bismuth products. Bismuth (atomic symbol: Bi, atomic number: 83) is a Block P, Group 15, Period 6 element with an atomic radius of 208.98040. The number of electrons in each of Bismuth's shells is 2, 8, 18, 32, 18, 5 and its electron configuration is [Xe] 4f14 5d10 6s2 6p3. Bismuth Bohr ModelThe bismuth atom has a radius of 156 pm and a Van der Waals radius of 207 pm. In its elemental form, bismuth is a silvery white brittle metal. Bismuth is the most diamagnetic of all metals and, with the exception of mercury, its thermal conductivity is lower than any other metal. Elemental BismuthBismuth has a high electrical resistance, and has the highest Hall Effect of any metal (i.e., greatest increase in electrical resistance when placed in a magnetic field). Bismuth is found in bismuthinite and bismite. It is also produced as a byproduct of lead, copper, tin, molybdenum and tungsten extraction. Bismuth was first discovered by Early Man. The name Bismuth originates from the German word 'wissmuth,' meaning white mass.

Iodine

See more Iodine products. Iodine (atomic symbol: I, atomic number: 53) is a Block P, Group 17, Period 5 element with an atomic radius of 126.90447. The number of electrons in each of Iodine's shells is 2, 8, 18, 18, 7 and its electron configuration is [Kr] 4d10 5s2 5p5. The iodine atom has a radius of 140 pm and a Van der Waals radius of 198 pm. In its elemental form, iodine has a lustrous metallic gray appearance as a solid and a violet appearance as a gas or liquid solution. Elemental IodineIodine forms compounds with many elements, but is less active than the other halogens. It dissolves readily in chloroform, carbon tetrachloride, or carbon disulfide. Iodine compounds are important in organic chemistry and very useful in the field of medicine. Iodine was discovered and first isolated by Bernard Courtois in 1811. The name Iodine is derived from the Greek word "iodes" meaning violet.

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