Sensitive Colorimetric Assay of H₂S Depending on the High-Efficient Inhibition of Catalytic Performance of Ru Nanoparticles

Abstract

Nanocatalysts depended colorimetric assay possesses the advantage of fast detection and provides a novel avenue for the detection of hydrogen sulfide (H2S). The exploration of nanocatalysts with superior catalytic activity is challenging to achieve ultrasensitive colorimetric assay of H2S. Herein, 1.7 ± 0.2 nm ruthenium nanoparticles (Ru NPs) were prepared and exhibited outstanding catalytic hydrogenation activity. The degradation rate constants of orange I in the presence of Ru NPs were 4-, 47- and 165-fold higher than those of platinum (Pt) NPs, iridium (Ir) NPs and control groups without catalysts. H2S-induced deactivation of Ru NP catalysts was designed for the sensitive colorimetric assay of H2S, attributing to the poor thiotolerance of Ru NPs. A standard linear curve between the rate constants and the concentration of H2S was established. The limit of detection (LOD) was as low as 0.6 nM. A Ru NPs based colorimetric principle was also used to fabricate colorimetric paper strips for the on-site visual analysis of H2S. The proposed approach shows potential prospective for the preparation of highly selective colorimetric NP sensors for specific purposes.

Exfoliation of Graphitic Carbon Nitride for Enhanced Oxidative Desulfurization: A Facile and General Strategy

“…Its removal is required in industrial processes as a result of pollution control and human health concerns. 1,2 Currently, the widely used technology for H 2 S elimination is a multistep Claus process. 3 However, due to the thermodynamic limitations, there is around 4% H 2 S left after undergoing the process.…”

“…H 2 S is corrosive, malodorous, and highly toxic. Its removal is required in industrial processes as a result of pollution control and human health concerns. , Currently, the widely used technology for H 2 S elimination is a multistep Claus process . However, due to the thermodynamic limitations, there is around 4% H 2 S left after undergoing the process. − With the increasingly stringent regulations on the emission of sulfur compounds, various desulfurization processes were developed.…”

Sensitive Sulfide Monitoring in Live Cells by Dark-Field Microscopy Based on the Formation of Ag2S on Au@AgI Core–Shell Nanoparticles

“…Hydrogen sulfide (H 2 S) is the third endogenous gas in mammals which has a great influence on human physiology and pathology including neurotransmission, vasodilation, and regulation of gastrointestinal and liver functions. − Notably, it has been reported that the average concentration of endogenous H 2 S is in the mM range, but due to the rapid synthesis and catabolism of intracellular H 2 S, the concentration of endogenous H 2 S can vary from sub-mM to a few nM rapidly . Therefore, it is highly desirable to develop a reliable and highly sensitive assay to monitor and track H 2 S in living cells or biological samples.…”

RuCu Cage/Alloy Nanoparticles with Controllable Electroactivity for Specific Electroanalysis Applications

“…As demonstrated in Figure b, in the presence of 100 nM Na 2 S, RuCu cage NPs showed a significantly decreased electro-oxidation peak at 0.84 V, while the oxidation signal at −0.16 V was very weak and no change was observed. However, RuCu alloy NPs only showed negligible DPV peak changes at both 0.84 and −0.16 V. Compared with RuCu alloy NPs, RuCu cage NPs showed a more sensitive response toward Na 2 S and became an alternative electroactive tag for the detection of Na 2 S. This was due to the main presence of Ru 0 in RuCu cage NPs and the unique hollow structure for the exposure of more Ru 0 electroactive sites for the rapid reaction with Na 2 S. The presence of Na 2 S induced the formation of the Ru–S bond, leading to the formation of Ru x S y components and decreasing the DPV signal of Ru 0 at 0.84 V. The DPV responses of RuCu cage NPs showed no obvious changes in the presence of 100 nM Na 2 S at different pH values ranging from 6 to 9, indicating the good stability of RuCu cage NPs for the application of Na 2 S detection (Figure S7). RuCu cage NPs with strong DPV peak at 0.84 V became an alternative electroactive tag for the detection of Na 2 S.…”