Design of Novel Ytterbium Molybdate Nanoflakes Anchored Carbon Nanofibers: Challenging Sustainable Catalyst for the Detection and Degradation of Assassination Weapon (Paraoxon-Ethyl)

Abstract

Design of resourceful and sustainable catalyst for the trace level identification as well as detoxification of toxic pollutants into the environment is a major concern to researchers. In view of that, we developed novel flakelike ytterbium molybdate (YbMoO 4 ; YbM) anchored on carbon nanofibers (YbM/f-CNFs) nanocomposite via simple wet-chemical route followed by a sonication process. The physicochemical properties of as-prepared YbM/f-CNFs were carried out by several spectroscopic techniques. The YbM/f-CNFs nanocomposite exhibited excellent electrocatalyst as well as photocatalyst for the detection and detoxification of chemical warfare agent paraoxonethyl (PTL). Interestingly, the electrochemical results illustrated that the YbM/f-CNFs nanocomposite exhibited an excellent electrocatalytic activity in terms of enhanced cathodic peak current and lower peak potential when compared with other modified electrodes. Furthermore, the YbM/f-CNFs modified electrode showed more extended linear response ranges (0.01−12 and 14−406 μM), lower detection limit (2 nM), good sensitivity (2.8 μAμM −1 cm −2 ), and excellent selectivity for the PTL sensing. Besides, the YbM/f-CNFs catalyst had good recovery to PTL in soil and water sample analysis. In addition, the YbM/f-CNFs nanocomposite possesses remarkable photocatalytic activity and stability toward the degradation and mineralization of PTL under visible light irradiation. Furthermore, a possible detection and degradation mechanism was proposed toward PTL. This study provides a novel idea for the design of proficient and stable bifunctional catalyst for the real-time identification and remediation of lethal pollutants.

A La3+-doped TiO2 nanoparticle decorated functionalized-MWCNT catalyst: novel electrochemical non-enzymatic sensing of paraoxon-ethyl

“…7(a) that the modied electrodes of TiO 2 NPs/ GCE and La 3+ doped TiO 2 NPs/GCE show very low capacitance, which suggests that there is not that much corresponding increase in capacitance when La 3+ is introduced into the TiO 2 NPs at a scan rate of 50 mV s À1 . In particular, the 6 Fig. 7(b) shows the experimental CV results of PE reduction and redox reaction at the La 3+ doped TiO 2 NP decorated f-MWCNT modied GCE recorded at a scan rate of 50 mV s À1 , which is summarized as a detailed mechanistic overview in Scheme 4.…”

“…[3][4][5] Therefore, the U.S Environment Protection Agency (EPA) stated that PE is an extremely toxic substance for both animals and human beings. 6 Environmentally friendly and efficient technologies for the detection of pesticides are highly desired. Nowadays, there are many possible conventional techniques for the detection of pesticides in contaminated water, such as high-performance liquid chromatography (HPLC) and HPLC-MS/MS, [7][8][9] gas chromatography and ultra-violet spectrophotometry, 10,11 and highperformance capillary zone electrophoresis.…”

“…12 Among these methods, those based on electrochemical sensors have been extensively used and have shown satisfactory results for OP analysis due to their uncomplicated operation, fast response, on-site detection, low-cost impact, extraordinary sensitivity, and selectivity. 6 Over past decades, various metal oxides have been investigated to enhance the electrochemical catalytic activity towards features needed for pesticide monitoring in the eld of electrochemistry. 13 To date, there has been interest in exploring the chemical and bio-sensing of several semiconducting metal oxides due to their tunable redox and conducting characteristics, affordability, high level of sensitivity, fast response time, and ability to classify the species of analytes.…”

Bifunctional Europium(III) and Niobium(V)‐Containing Saponite Clays for the Simultaneous Optical Detection and Catalytic Oxidative Abatement of Blister Chemical Warfare Agents

“…It is thus essential to develop efficient and sustainable procedures for a correct and safe destruction or abatement of CWAs [10, 11] . At the same time, a timely detection of highly toxic agents can promptly reveal the presence (or the absence) of immediate health risks to operators who have to deal with these extremely hazardous materials [12–15] . Designing and obtaining materials with a combined detection/decontamination capability would be a remarkable added value.…”

“…Likewise, supramolecular diamide organogels showed sensing and decontamination properties, but stoichiometric amounts of tetrabutylammonium 4‐benzaldoximate, as a reactive decontaminant, were necessary to carry out the detoxification of the organophosphorus compound [13] . Carbon‐supported ytterbium molybdate nanoflakes need a light source to complete the photocatalytic abatement of the nerve CWA simulant [15] …”