Photocatalytic decomposition of DMMP on titania

Obee, Timothy N.; Satyapal, Sunita

doi:10.1016/s1010-6030(98)00372-4

Cited by 88 publications

(78 citation statements)

References 26 publications

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“…We use derivatization techniques to analyze the unknown nonvolatile products qualitatively. Bis (trimethylsilyl) trifluoroacetamide +1% trimethylchlorosilane (BSTFA + 1%TMCS) is used as the derivatization reagent and is purchased from Supelco [4][5][6][7][8][9][10].…”

Section: Methodsmentioning

confidence: 99%

“…Photocatalysis approach, as a new developing and advanced oxidation technology, has been widely applied to the environmental purification [2]. Depended on considerable investigations, researchers have found that photocatalysis method is also effective to decontaminate CWAs and simulants [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Vorontsov et al [5][6][7] investigated the decontamination of Mustard gas simulant 2-CEES over different TiO 2 , and found the main products in the gas phase were CH 3 CHO, CH 3 COOH, C 2 H 4 , CO 2 , H 2 O, HCl, and the surface products were CH 3 COOH, disulfide, sulfoxide (trace), sulfone, SO 4 2-, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Hoffman [11] studied the photooxidation of gaseous Sarin simulant DMMP on TiO 2 . The main vapor products, including CH 3 OH, HCHO, HCOOH, CO 2 , H 2 O, and the main surface products, including MMP (methyl methylphosphonate), MPA (methylphosphonate acid), HCOOH and PO 4 -3 , were detected. The results of these researches indicate that 2-CEES and DMMP could be effectively decomposed by photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

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Sulfated TiO2 Decontaminate 2-CEES and DMMP in Vapor Phase

Han

Zhang

Xi³

et al. 2007

Catal Lett

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An acid photocatalyst TiO 2 , modified with H 2 SO 4 , is prepared and used to decontaminate Chemical Warfare Agents (CWAs) simulants 2-CEES (2-chloroethyl ethyl sulfide) and DMMP (dimethyl methylphosphonate) in vapor phase. Compared with the unmodified pure TiO 2 photocatalyst, the adsorption capacity on the sulfated photocatalyst increases by 50%, and the conversion for 2-CEES increases more than 20%. It is found that the durability for decontaminating DMMP is delayed by 200 min with the modified photocatalyst. The surface characteristics of the photocatalysts are analyzed by XPS and FT-IR. The results show that more Lewis and Brönsted acid sites, considered to be responsible for improving the reactivity performance of photocatalysts, are formed on the sulfated TiO 2 .

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sulfated TiO2 Decontaminate 2-CEES and DMMP in Vapor Phase

Han

Zhang

Xi³

et al. 2007

Catal Lett

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“…However, the GBFF and HEPA media architectures were not viable approaches due to limitations in pressure drop or system size. Obee et al (1998) also assessed the removal of DMMP from the gas phase. The inlet concentration was 90 ppm.…”

Section: Photocatalytic Oxidationmentioning

confidence: 99%

Technology Survey for Enhancement of Chemical Biological Radiological and Nuclear Respiratory Protection

Richardson¹,

Hofacre²,

Gardner³

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currentiy valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM SPONSORING I MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)DIR, ECBC, ATTN: AMSRD-ECB-RT-PR, APG, MD 21010-5424 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTESCOTR: Paul D. Gardner, AMSRD-ECB-RT-PR, (410) 436-6692 ABSTRACTA technology survey was conducted to identify enhancement technologies that offer the most promise for significant advancements in chemical, biological, radiological, and nuclear individual respiratory protection. The focus was on two enhancement areas: protection and physiology. Novel sealing concepts based on responsive materials were sought that offer potential for performance enhancement. The search for cooling technologies focused on air-management systems (i.e., miniature fans and blowers) and thermoelectric devices. Finally, non-carbon based filtration systems that offer improved protection capabilities were sought. The U.S. Army Edgewood Chemical Biological Center, U.S. Army Research Development and Engineering Command, is investigating emerging technologies that offer the potential for advancement in chemical, biological, radiological, and nuclear individual respiratory protection. The objective of this task was to identify technologies that offer potential improvement in field protection factor performance or reduced physiological burden. From a protection perspective, the two areas of focus were the facial seal and filtration. Novel sealing concepts based on responsive materials that may adjust to facial movements or compensate for improper donning were targeted. For filtration, the potential to integrate photocatalytic oxidation or catalytic oxidation reactors into an individual protection system was assessed. Cooling technologies which were considered in the technology survey included miniature airmanagement systems (i.e., miniature fans and blowers) and thermoelectric devices. SUBJECT TERMSResponsive materials undergo a reversible change in physical shape in response to an external stimulus such as changes in temperature, pressure, electr...

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“…The structure of DMMP and two representative hazardous compounds are shown in Figure 1. Oxidation studies performed with DMMP are expected to provide a conservative estimate of the degradation rate obtainable with the target compounds [5,6]. In addition, DMMP is known to yield lower photoreaction rates than other potential surrogate compounds, including trimethyl phosphate, triethyl phosphate and diethyl phosphoramidate [7].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Dimethyl Methylphosphonate in Aqueous Suspensions of TiO2

Skaf¹

2015

J Chem Eng Process Technol

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Heterogeneous photocatalysis using simulated solar irradiation in the presence of titanium dioxide was studied using dimethyl methylphosphonate (DMMP) as a surrogate for organophosphorus compounds including pesticides and chemical warfare agents. A reduction in solution pH accompanied DMMP degradation with the pH approaching the pKa of DMMP. Addition of peroxide before reaction increased the amount of DMMP degraded. Nearly complete destruction of DMMP was only achieved with the largest addition of peroxide. Photoreaction of DMMP in a pH 10 solution and a pH 10 carbonate buffer degraded a similar percent of the solute, with a more gradual reaction observed for the buffered solution. Variations in reaction conditions were studied to evaluate the effect of potential spill conditions. The presence of fulvic acid in the solution slightly enhanced the oxidation of DMMP and the absence of dissolved oxygen inhibited DMMP oxidation. DMMP solutions prepared in simulated sea water reached similar degradation percentages as pure solutions, however, reacted more slowly.

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Photocatalytic decomposition of DMMP on titania

Cited by 88 publications

References 26 publications

Sulfated TiO2 Decontaminate 2-CEES and DMMP in Vapor Phase

Sulfated TiO2 Decontaminate 2-CEES and DMMP in Vapor Phase

Technology Survey for Enhancement of Chemical Biological Radiological and Nuclear Respiratory Protection

Photocatalytic Oxidation of Dimethyl Methylphosphonate in Aqueous Suspensions of TiO2

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