Sulfated TiO2 Decontaminate 2-CEES and DMMP in Vapor Phase

Abstract

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 .

Decontamination of VX Surrogate Malathion by Atmospheric Pressure Radio-frequency Plasma Jet

“…As its corrosiveness to metals, plastics, leather and even skin etc., the ''wet'' methods are not suitable in such areas as sensitive equipment, electronics or interior space. For this reason, ''dry'' (non-aqueous) plasma decontamination methods have addressed a great range of concerns [2][3][4][5][6][7][8].…”

Sulfated Titania (TiO2‐SO42−) as an Efficient Catalyst for Organic Synthesis: Overarching Review from 2000 to 2021

“…[142] The sulfated titania photocatalyst used to decontaminate chemical warfare agent's simulants 2-chloroethyl ethyl sulfide and dimethyl methylphosphonate in the vapor phase was studied. [143] Overall consolidation of organic reactions catalyzed by sulfate titania (TiO 2 -SO 4 2À ) is presented in Table 2. The attractive feature of the green chemistry approach is the reusability of the solid acid catalyst, sulfated titania.…”

“…It is reported Cu/SO 4 2− ‐TiO 2 prepared by electroless plating method is involved in the photocatalytic reduction of CO 2 to methanol, methane, CO and H 2 [142] . The sulfated titania photocatalyst used to decontaminate chemical warfare agent's simulants 2‐chloroethyl ethyl sulfide and dimethyl methylphosphonate in the vapor phase was studied [143] …”

Nano-structured Solids and Heterogeneous Catalysts for the Selective Decontamination of Chemical Warfare Agents

“…In these examples, no metal nanoparticles were necessary to carry out the reaction (as shown in the previous section), but the decontamination properties were enhanced by adding additional catalytic sites. For instance, some strong acid centers can be introduced on TiO 2 by sulfation treatment with H 2 SO 4 and sulfated titania photocatalyst proved to be 50 % more effective in adsorption capacity and 20 % more active in CEES conversion than the unmodifi ed pure TiO 2 [ 33 ]. Interestingly, the use of solid catalysts under heterogeneous conditions permits the peculiar combination of active species that typically cannot be compatible with one another.…”