Under conditions selected to minimize the loss of initial transformation products through reaction with radicals, the production of phenol only accounted for 30%-60% of the benzene lost in the presence of O2. pH was buffered at 8.0 with 50 mM borate. Epub 2012 Sep 18. Aher A, Papp J, Colburn A, Wan H, Hatakeyama E, Prakash P, Weaver B, Bhattacharyya D. Chem Eng J. Rates of production of SO4(•-) or hydroxyl radical (HO(•)) generated from radical chain reactions were affected by the concentration of benzene, with rates of S2O8(2-) decomposition increasing as the benzene concentration increased. Lyngsie G, Krumina L, Tunlid A, Persson P. Sci Rep. 2018 Jul 17;8(1):10834. doi: 10.1038/s41598-018-29075-5. Environ Sci Technol. Goethite=50 g/L, initial [benzene]=1000 μM, initial [S. Illustration of major radical chain reactions when persulfate is activated by transition metal oxide in the absence of benzene or other contaminants. Epub 2018 Jul 7. Catalytic oxidation of benzene with ozone over alumina-supported manganese oxides was carried out at room temperature (295 K) to investigate the behavior of benzene oxidation and CO x formation. 2019 Dec;133(Pt A):105141. doi: 10.1016/j.envint.2019.105141. Catalytic oxidation of benzene with ozone over alumina-supported manganese oxides was carried out at room temperature (295 K) to investigate the behavior of benzene oxidation and COx formation. Clipboard, Search History, and several other advanced features are temporarily unavailable. The ratio of the decomposition rate for ozone to that for benzene was found to be 6, independent of ozone concentration, reaction times, and the amount of Mn loading. Epub 2017 Mar 17. Proposed radical chain reactions involving S. Environ Sci Technol. Although engineers are aware of the ability of transition metal oxides to activate persulfate, the operation of ISCO remediation systems is hampered by an inadequate understanding of the factors that control SO4(•-) production and the overall efficiency of the process. Copyright © 2020 Elsevier B.V. or its licensors or contributors. 2014 Sep 2;48(17):10330-6. doi: 10.1021/es502056d. Remember that benzene, methylbenzene and similar hydrocarbons based on benzene rings are collectively known as arenes. Sulfate … 2017 Nov 1;327:573-583. doi: 10.1016/j.cej.2017.06.128. Catalyst was significantly deactivated due to the buildup of the intermediates on the catalyst surface during the course of benzene oxidation. The high phenol selectivity of 87.18% can be obtained over Zn 2 Ti-LDH in water under light irridation.. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Photocatalytic selective oxidation of benzene to phenol in water over layered double hydroxide: A thermodynamic and kinetic perspective. ACS Omega. Changes of total benzene concentration during persulfate activation in the presence of 50 g/L of goethite. Epub 2017 Jun 24. Get the latest public health information from CDC: https://www.coronavirus.gov. The formation of the ring-cleavage product warrants further studies of its toxicity and persistence in the subsurface. Benzene and its oxidation products were analyzed on a Waters Alliance 2695 HPLC (Waters Corp., Milford, MA) equipped with a diode array detector and a Waters Symmetry-C18 column. Catal Sci Technol. Naphthenic acids removal from high TDS produced water by persulfate mediated iron oxide functionalized catalytic membrane, and by nanofiltration. The remaining products included a ring-cleavage product that appeared to contain an α,β-unsaturated aldehyde functional group. Sulfate and oxygen are the final products of persulfate activation. In situ chemical oxidation of contaminated groundwater by persulfate: decomposition by Fe(III)- and Mn(IV)-containing oxides and aquifer materials. Mechanisms on the Impacts of Alkalinity, pH, and Chloride on Persulfate-Based Groundwater Remediation. © 2020 Elsevier B.V. All rights reserved. Herein, the selective photocatalytic oxidation of benzene to phenol was used as the model reaction, and through tailoring the band structure for an appropriate thermodynamic driving force, Zn2Ti-layered double hydroxide (Zn2Ti-LDH) photocatalyst showed one-step oxidation of benzene to phenol in water with a high phenol selectivity of 87.18%. Carbon balance was in the range of 26–37% due to the formation of two types of intermediates, weakly bound compounds including formic acid and strongly bound surface formate and carboxylates. Enhanced degradation of isoproturon in soil through persulfate activation by Fe-based layered double hydroxide: different reactive species comparing with activation by homogenous Fe(II). We use cookies to help provide and enhance our service and tailor content and ads. Samples were collected at different reaction times during benzene oxidation in the presence of persulfate and different concentrations of solids. The catalyst was reusable and very stable. Author information: (1)Department of Chemical and Environmental Engineering , University of California at Riverside , Riverside, California 92521 United States. This strategy provides a guidance to design efficient photocatalysts for selective catalytic oxidation. Relationship between phenol concentration and the UV peak intensity of the unknown oxidation product. Environ Int. Changes of persulfate concentrations during mineral-catalyzed activation. Detailed characterization revealed that the formed oxygen vacancies onto the surface of the LDH photocatalyst enhanced the photoinduced charge-carrier separation/transformation efficiency, increased the content of superoxide radicals, thus promoted the photocatalytic oxidation reaction. NIH Here, we report the FeCl3 and mesoporous carbon nitride hybrid (FeCl3/mpg-C3N4) as an active and selective photocatalyst to activate H2O2 for the oxidation of benzene …
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