Abiotic transformation of hexabromocyclododecane by sulfidated nanoscale zerovalent iron: Kinetics, mechanism and influencing factors

Water Research
Dan LiPing'an Peng

Abstract

Recent studies showed that sulfidated nanoscale zerovalent iron (S-nZVI) is a better reducing agent than nanoscale zerovalen iron (nZVI) alone for reductive dechlorination of several organic solvents such as trichloroethylene (TCE) due to the catalytic role of iron sulfide (FeS). We measured the rates of transformation of hexabromocyclododecane (HBCD) by S-nZVI and compared them to those by FeS, nZVI, and reduced sulfur species. The results showed that: i) HBCD (20 mg L-1) was almost completely transformed by S-nZVI (0.5 g L-1) within 12 h; ii) the reaction with β-HBCD was much faster than with α- and γ-HBCD, suggesting the diastereoisomeric selectivity for the reaction by S-nZVI; and iii) the reaction with S-nZVI was 1.4-9.3 times faster than with FeS, S2- and nZVI, respectively. The study further showed that the HBCD reaction by S-nZVI was likely endothermic, with the optimal solution pH of 5.0, and could be slowed in the presence of Ca2+, Mg2+, NO3-, HCO3- and Cl-, and by increasing ionic strength, solvent content and initial HBCD concentration, or decreasing the S-nZVI dosage. GC-MS analysis showed that tetrabromocyclododecene and dibromocyclododecadiene were the products. XPS spectra indicated that both Fe(II) and S(-II) o...Continue Reading

Citations

Nov 29, 2020·The Science of the Total Environment·Yaru LiLizhong Zhu
Jan 29, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·J J LianP A Peng
Jul 7, 2019·The Science of the Total Environment·Thao Thanh LeYoon-Seok Chang
Jun 30, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Shun ChengXianyuan Fan
Oct 17, 2017·Environmental Science & Technology·Dimin FanAbinash Agrawal
Mar 13, 2019·Environmental Science & Technology·Marco MangayayamDominique J Tobler
Nov 15, 2017·Environmental Science & Technology·Jinxiang LiXiaohong Guan
Sep 14, 2017·Environmental Science & Technology·Zhen CaoGregory V Lowry
Sep 4, 2021·Environmental Pollution·Haozheng HeShanquan Wang

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