The reaction of hexabromocyclododecane (HBCDD), a widely used brominated flame retardant, was studied in a heterogenous mixture containing reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The results indicate that across the pHs 6.86, 6.95, 7.15 and 7.35 γ and β-HBCDD are degraded within a couple days. The pseudo-first order rate constants at pH 6.95 are 0.049 hr-1 for β-HBCDD and 0.043 hr-1 γ-HBCDD, reaching their half-life within 15 hours of the reaction. These experiments also illustrate the isomers experience slightly different reactivities with different pHs with α-HBCDD reacting the slowest.
","abstract_html":"<p>The reaction of hexabromocyclododecane (HBCDD), a widely used brominated flame retardant, was studied in a heterogenous mixture containing reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The results indicate that across the pHs 6.86, 6.95, 7.15 and 7.35 γ and β-HBCDD are degraded within a couple days. The pseudo-first order rate constants at pH 6.95 are 0.049 hr<sup>-1</sup> for β-HBCDD and 0.043 hr<sup>-1</sup> γ-HBCDD, reaching their half-life within 15 hours of the reaction. These experiments also illustrate the isomers experience slightly different reactivities with different pHs with α-HBCDD reacting the slowest.</p>","abstract_has_math":false,"creators":["Roopnarine, Kristian K"],"institution":null,"degree_name":"Master of Science (M.S.)","degree_level":"Thesis","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Urs Jans","Barbara Zajc","Glen Kowach"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-01-01T08:00:00Z","date_published":"2018-01-01T08:00:00Z","updated_at":"2026-07-24T01:57:21Z","subjects":["Hematite","adsorbed Fe(II)","adsorbed Fe(II) kinetics","Analytical Chemistry","Environmental Chemistry"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://academicworks.cuny.edu/cc_etds_theses/779","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Urs Jans","Barbara Zajc","Glen Kowach"]},{"key":"dc:creator","label":"Author","values":["Roopnarine, Kristian K"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2019-06-11T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (M.S.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Hematite","adsorbed Fe(II)","adsorbed Fe(II) kinetics","Analytical Chemistry","Environmental Chemistry"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://academicworks.cuny.edu/cc_etds_theses/779"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The reaction of hexabromocyclododecane (HBCDD), a widely used brominated flame retardant, was studied in a heterogenous mixture containing reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The results indicate that across the pHs 6.86, 6.95, 7.15 and 7.35 γ and β-HBCDD are degraded within a couple days. The pseudo-first order rate constants at pH 6.95 are 0.049 hr-1 for β-HBCDD and 0.043 hr-1 γ-HBCDD, reaching their half-life within 15 hours of the reaction. These experiments also illustrate the isomers experience slightly different reactivities with different pHs with α-HBCDD reacting the slowest.
"]},{"key":"dc:title","label":"Title","values":["The study of the degradation of hexabromocyclododecane in a heterogeneous system containing Fe(II) adsorbed to the iron oxide Hematite."]}]}],"canonical_facts":{"dc:contributor":["Urs Jans","Barbara Zajc","Glen Kowach"],"dc:creator":["Roopnarine, Kristian K"],"dc:date.available":["2019-06-11T07:00:00Z"],"dc:description.abstract":["The reaction of hexabromocyclododecane (HBCDD), a widely used brominated flame retardant, was studied in a heterogenous mixture containing reactive Fe(II) adsorbed to the iron oxide hematite. The adsorbed Fe(II)/iron oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The results indicate that across the pHs 6.86, 6.95, 7.15 and 7.35 γ and β-HBCDD are degraded within a couple days. The pseudo-first order rate constants at pH 6.95 are 0.049 hr-1 for β-HBCDD and 0.043 hr-1 γ-HBCDD, reaching their half-life within 15 hours of the reaction. These experiments also illustrate the isomers experience slightly different reactivities with different pHs with α-HBCDD reacting the slowest.
"],"dc:identifier":["https://academicworks.cuny.edu/cc_etds_theses/779"],"dc:subject":["Hematite","adsorbed Fe(II)","adsorbed Fe(II) kinetics","Analytical Chemistry","Environmental Chemistry"],"dc:title":["The study of the degradation of hexabromocyclododecane in a heterogeneous system containing Fe(II) adsorbed to the iron oxide Hematite."],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (M.S.)"]},"updated_at":"2026-07-24T01:57:21Z"}