Biochar and kinetics studies on the reduction of sodium bromate by a cobaloxime in an aqueous media: How we can remove a toxic substance from our environment

Title Biochar and kinetics studies on the reduction of sodium bromate by a cobaloxime in an aqueous media: How we can remove a toxic substance from our environment
Authors E.A. Tonsel-White; M.J. Celestine; C.M. Tano; B.S. Nunez; S. Kumar; A.A. Holder
Journal Inorganica Chimica Acta
DOI 10.1016/j.ica.2020.119697
Abstract The reduction of sodium bromate (NaBrO3) by [Co(dmgBF2)2(OH2)2] (where dmgBF2 = difluoroboryldimethylglyoximato) was investigated in hydrochloric and nitric acids. Analytical studies were carried out via gravimetric analysis and UV?visible spectrophotometry. Gravimetric analysis proved that sodium bromate was reduced to from quantitative amounts of sodium bromide in the presence of hydrochloric acid. Biochar was used to sequester the complex from the reaction mixture and to neutralize the acidic media. The UV?visible data confirmed the sequestration of the complex from the reaction mixture after exposure to the biochar. The collected pH data proved a direct relationship between pH and the amount of biochar used in the form of a titration curve. Kinetic studies were also carried out to ascertain the mechanism of the oxidation of [Co(dmgBF2)2(OH2)2] by NaBrO3. The oxidation of [Co(dmgBF2)2(OH2)2] by NaBrO3 was carried out by stopped-flow spectrophotometry at 450 nm by varying temperature and over the range of 1.00 mM ? [HCl] ? 11.00 mM, at a constant ionic strength of 0.60 M (NaCl). From the data, a mechanism for the reaction was proposed. From the mechanism the following rate expression was derived, kobs=k2Ka\;+\;k\;1H+BrO3-T[H+]\;+\;Ka, where k1 was calculated to be 4.2 × 104 M?1 s?1 at 25 °C, and the activation parameters (?H? and ?S?) were calculated as 57 ± 1 kJ mol?1 and 34 ± 4 J mol?1 K?1, respectively.
Citation E.A. Tonsel-White; M.J. Celestine; C.M. Tano; B.S. Nunez; S. Kumar; A.A. Holder.Biochar and kinetics studies on the reduction of sodium bromate by a cobaloxime in an aqueous media: How we can remove a toxic substance from our environment. Inorganica Chimica Acta. 2020;510. doi:10.1016/j.ica.2020.119697

Related Elements

Bromine

35 Br 79.904000000 Bromine

See more Bromine products. Bromine (atomic symbol: Br, atomic number: 35) is a Block P, Group 17, Period 4 element. Its electron configuration is [Ar]4s23d104p5. The bromine atom has a radius of 102 pm and its Van der Waals radius is 183 pm. In its elemental form, bromine Bromine Bohr Model has a red-brown appearance. Bromine does not occur by itself in nature; it is found as colorless soluble crystalline mineral halide salts. Bromine was discovered and first isolated by Antoine Jérôme Balard and Leopold Gmelin in 1825-1826.

Sodium

11 Na 22.989769280 Sodium

Sodium Bohr ModelSee more Sodium products. Sodium (atomic symbol: Na, atomic number: 11) is a Block D, Group 5, Period 4 element with an atomic weight of 22.989769. The number of electrons in each of Sodium's shells is [2, 8, 1] and its electron configuration is [Ne] 3s1. The sodium atom has a radius of 185.8 pm and a Van der Waals radius of 227 pm. Sodium was discovered and first isolated by Sir Humphrey Davy in 1807. In its elemental form, sodium has a silvery-white metallic appearance. It is the sixth most abundant element, making up 2.6 % of the earth's crust. Sodium does not occur in nature as a free element and must be extracted from its compounds (e.g., feldspars, sodalite, and rock salt). The name Sodium is thought to come from the Arabic word suda, meaning "headache" (due to sodium carbonate's headache-alleviating properties), and its elemental symbol Na comes from natrium, its Latin name.

Related Forms & Applications

Bromates
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