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Hydrogen sulfide (H2S) is widely found in oil and natural gas wells and industrial wastewater tanks. Owing to its high toxicity, the monitoring and detection of H2S in the air is essential. However, recent techniques for the quantitative detection of H2S gas suffer from limitations such as high cost, complicated operation, and insufficient sensitivity, preventing their practical application in industry. Thus, we have developed a portable test paper for real-time and inexpensive monitoring of H2S gas by color changes. The test paper had a significantly low H2S detection limit of 200 ppb, which is considered safe for humans. Moreover, the color of the test paper did not change noticeably when exposed to CO2, N2, O2, and air environments, indicating that the test paper is selective for H2S gas and can be stored for a long time. In addition, we fitted a color difference linear model between the color difference values (ΔE) and the concentrations of H2S gas. The establishment of the linear model substantiates that the test paper can provide accurate intensity information when detecting H2S gas leakage. [ABSTRACT FROM AUTHOR]

Titanium alloys are widely used in many domains due to their excellent high specific strength and corrosion resistance. Stress plays a very important role in the application of titanium alloys. In order to shed light on the titanium alloys corrosion mechanisms under varying stress conditions, this paper first reviewed the impact of elastic and plastic stress on the corrosion behavior of titanium alloys. And then reviewed the influence of stress caused by surface treatment, such as laser welding, laser strengthening, and ultrasonic surface treatment, on corrosion behavior. Finally reviewed the effect of factors, including temperature, pH value, oxygen content and alloying elements, on titanium alloys corrosion behavior with stress. Hope this work demonstrated clearly that the corrosion mechanism of titanium alloy with various stress, and offering valuable support for future research and applications. [ABSTRACT FROM AUTHOR]

[Display omitted] • The oxidation mechanism and the influencing factors of EOPs are systematically presented. • The advantages and limitations of commonly used anode materials and their evaluation criteria and systems are reviewed. • The key challenges of EOPs in theoretical research and practical application are analyzed. • Perspective and suggestions for the future development of EOPs are proposed. Compared with conventional wastewater treatment processes, electrochemical oxidation processes (EOPs) can remove hazardous substances from wastewater more efficiently and without pollution. With the rapid development of green power technology, there are more development prospects for EOPs in wastewater treatment. In recent years, research related to EOPs in the field of wastewater treatment has flourished, numerous researchers have reviewed the last advances. However, the key challenges and future directions of EOPs in the context of carbon neutrality are still under-analyzed. In this review, we first summarize the oxidation mechanism and various control factors of EOPs. Then, we discuss the current development status of current and emerging electrode materials, and summarize their commonly used evaluation criteria and systems. Finally, based on the above review, we analyze the key challenges faced by EOPs in theoretical research and practical applications, and propose potential directions for the development of EOPs in wastewater treatment to meet the growing demand for carbon neutrality. We believe that this review will offer crucial guidance and reference to enhance the application and dissemination of EOPs in organic wastewater treatment. [ABSTRACT FROM AUTHOR]

Recently, Pickering emulsions stabilized by photocatalytic nanomaterials have become a hotspot in the field of catalysis due to their high interfacial activity. However, since most photocatalytic nanomaterials are extremely hydrophilic, using them as stabilizers is unconvenient for Pickering emulsions construction. Herein, a novel magnetic Janus nanosheets (JMPSN/α-FeOOH) with Janus SiO 2 nanosheets as the carrier and iron oxyhydroxide (α-FeOOH) as the catalyst species, respectively, was successfully fabricated through a simple synthetic strategy, which could act as an environmental-friendly Pickering emulsion emulsifier and catalyst simultaneously. We demonstrated that JMPSN/α-FeOOH exhibited good emulsifying properties of various oil phases. Morever, JMPSN/α-FeOOH in the formed Pickering emulsion-based photocatalytic system displayed significantly enhanced photocatalytic efficiency in degradation of dyes as compared to traditional non-emulsified systems while maintaining the stability of Pickering emulsion under constant irradiation. JMPSN/α-FeOOH could also quickly respond to external magnetic fields so as to achieve rapid recovery of catalyst, and catalyst still showed high catalytic activity after many catalytic cycles. Finally, a convenient and promising synthesis strategy for preparing Janus catalyst with low toxicity was proposed, which provided a guidance on how to effectively use the emulsion system stabilized by Janus catalyst to improve the degradation efficiency of various pollutants. [Display omitted] • An oil-in-water Pickering emulsion was stabilized by JMPSN/α-FeOOH without the use of any surfactants. • Pickering emulsion showed excellent photoefficiency and stability for dyes degradation. • JMPSN/α-FeOOH could quickly respond to external magnetic signals. • JMPSN/α-FeOOH still showed high catalytic activity after many catalytic cycles. [ABSTRACT FROM AUTHOR]

[Display omitted] • Uniform nanoporous is prepared on high-entropy amorphous alloy by controllable corrosion. • The electrode shows superior HER catalytic performance and corrosion resistance in hot H 2 SO 4. • Provide a strategy for in situ construction and repair of the catalytic interface. Producing high-purity hydrogen from water electrolysis using intermittent renewable electricity is fascinating and challenging. Noble metal-based high-entropy alloy with near-equimolar mixed elements have unique properties including cocktail effect, high entropy effect and lattice distortion effect, which are beneficial to improve catalytic performance and reduce the amount of noble metal. Taking advantages of excellent mechanical properties, high thermal stability and corrosion resistance, as well as chemical uniformity and tunability, equiatomic high-entropy metallic glass PdPtCuNiP was employed to construct nanosponge-like architecture with uniform nanopores via a precise strategy of potentiostatic electrochemical dealloying, which presented superior hydrogen evolution reaction (HER) electrocatalytic performance in hot dilute H 2 SO 4. The Tafel slope is 34.2 mV dec−1 and the overpotential corresponding to 10 mA cm−2 is 35.4 mV, outperforming commercial Pt/C catalyst and most currently available electrocatalysts. Furthermore, even electrocatalytic performance of nanoporous PdPtCuNiP is degraded tinily by hot dilute H 2 SO 4 accordng to power-off or low-voltage operation of water-electrolysis system, it can be directly refreshed by in-situ potentiostatic polarization in the electrolyzer. We believe the strategy of in-situ construction and repair of nanostructured electrocatalytic surface on high-entropy alloy in this study will call for more endeavors to realize the practicality of hydrogen production in harsh acidic electrolyte. [ABSTRACT FROM AUTHOR]

Hexagonal boron nitride (h-BN) has great promise for metal corrosion due to its good impermeability to gas and liquid. However, it is difficult for h-BN to disperse in water-borne epoxy (WBE) matrix owing to its nature hydrophobicity. In this work, h-BN was non-covalently modified by graphene oxide (GO) to enhance the compatibility of h-BN for WBE. And the GO/h-BN composite was characterized by transmittance electron microscopy (TEM), Raman spectroscopy, UV–vis absorbance spectroscopy and X-ray photoelectron spectroscopy (XPS). The corrosion protection and barrier performance of GO/h-BN/WBE were evaluated by electrochemical impedance spectroscopy (EIS) and salt spray test, which indicated that the composite coating with 0.3 wt. % GO/h-BN (1:1 w/w) additive exhibited excellent barrier and corrosion protection properties owing to the synergistic impermeable performance of h-BN and GO. [ABSTRACT FROM AUTHOR]