The transformation of solid waste into high-value-added materials is pivotal for advancing resource circularity and promoting environmental sustainability.In this study,the high-value upcycling of iron ore tailings(IO...The transformation of solid waste into high-value-added materials is pivotal for advancing resource circularity and promoting environmental sustainability.In this study,the high-value upcycling of iron ore tailings(IOTs)into environmentally benign,turquoise-colored iron-composite pigments was demonstrated via a facile one-pot hydrothermal synthesis route.Structural and morphological characterization revealed that the as-synthesized pigments exhibit a distinct fusiform microstructure,predominantly composed of giniite and quartz phases,with additional trace elements(Fe,Si,P,Al,and Mg)contributing to their unique chromatic properties.The pigments displayed a vibrant turquoise hue,with Commission Internationale de L’Eclairage(CIE)Lab color coordinates of L^(*)=59.66,a^(*)=−5.98,and b^(*)=−3.57,indicative of stable and aesthetically desirable coloration.Notably,the pigments demonstrated exceptional long-term color stability,maintaining their chromatic properties without significant degradation even after 12 months of ambient atmospheric exposure.Furthermore,the absence of toxic heavy metals and hazardous substances confirms their environmental compatibility and safety for potential industrial applications.This study not only presents a sustainable and scalable strategy for the valorization of IOTs but also contributes to the development of eco-friendly inorganic pigments,aligning with the principles of green chemistry and a circular economy.The findings highlight the potential of mining waste as a valuable resource for high-performance pigment production,offering a promising alternative to conventional synthetic pigments while mitigating the environmental burdens associated with tailings disposal.展开更多
Monolayer tungsten disulfide （WS2）, a typical member of the semiconducting transition metal dichalcogenide family has drawn considerable interest because of its unique properties. Intriguingly the edge of WS2 exhibi...Monolayer tungsten disulfide （WS2）, a typical member of the semiconducting transition metal dichalcogenide family has drawn considerable interest because of its unique properties. Intriguingly the edge of WS2 exhibits an ideal hydrogen binding energy which makes WS2 a potential alternative to Pt-based electrocatalysts for the hydrogen evolution reaction （HER）. Here, we demonstrate for the first time the successful synthesis of uniform monolayer WS2 nanosheets on centimeter- scale Au foils using a facile, low-pressure chemical vapor deposition method. The edge lengths of the universally observed triangular WS2 nanosheets are tunable from -100 to N1,000 nm. The WS2 nanosheets on Au foils featuring abundant edges were then discovered to be efficient catalysts for the HER, exhibiting a rather high exchange current density of -30.20 μA/cm2 and a small onset potential of Nl10 mV. The effects of coverage and domain size （which correlate closely with the active edge density of WS2） on the electrocatalytic activity were investigated. This work not only provides a novel route toward the batch-production of monolayer WS2 via the introduction of metal foil substrates but also opens up its direct application for facile HER.展开更多
基金supported by the Natural Science Foundation of Hebei Province(Nos.E2019202411 and E2023202160)the Foundation of a company(No.KHX2024-091).
文摘The transformation of solid waste into high-value-added materials is pivotal for advancing resource circularity and promoting environmental sustainability.In this study,the high-value upcycling of iron ore tailings(IOTs)into environmentally benign,turquoise-colored iron-composite pigments was demonstrated via a facile one-pot hydrothermal synthesis route.Structural and morphological characterization revealed that the as-synthesized pigments exhibit a distinct fusiform microstructure,predominantly composed of giniite and quartz phases,with additional trace elements(Fe,Si,P,Al,and Mg)contributing to their unique chromatic properties.The pigments displayed a vibrant turquoise hue,with Commission Internationale de L’Eclairage(CIE)Lab color coordinates of L^(*)=59.66,a^(*)=−5.98,and b^(*)=−3.57,indicative of stable and aesthetically desirable coloration.Notably,the pigments demonstrated exceptional long-term color stability,maintaining their chromatic properties without significant degradation even after 12 months of ambient atmospheric exposure.Furthermore,the absence of toxic heavy metals and hazardous substances confirms their environmental compatibility and safety for potential industrial applications.This study not only presents a sustainable and scalable strategy for the valorization of IOTs but also contributes to the development of eco-friendly inorganic pigments,aligning with the principles of green chemistry and a circular economy.The findings highlight the potential of mining waste as a valuable resource for high-performance pigment production,offering a promising alternative to conventional synthetic pigments while mitigating the environmental burdens associated with tailings disposal.
文摘Monolayer tungsten disulfide （WS2）, a typical member of the semiconducting transition metal dichalcogenide family has drawn considerable interest because of its unique properties. Intriguingly the edge of WS2 exhibits an ideal hydrogen binding energy which makes WS2 a potential alternative to Pt-based electrocatalysts for the hydrogen evolution reaction （HER）. Here, we demonstrate for the first time the successful synthesis of uniform monolayer WS2 nanosheets on centimeter- scale Au foils using a facile, low-pressure chemical vapor deposition method. The edge lengths of the universally observed triangular WS2 nanosheets are tunable from -100 to N1,000 nm. The WS2 nanosheets on Au foils featuring abundant edges were then discovered to be efficient catalysts for the HER, exhibiting a rather high exchange current density of -30.20 μA/cm2 and a small onset potential of Nl10 mV. The effects of coverage and domain size （which correlate closely with the active edge density of WS2） on the electrocatalytic activity were investigated. This work not only provides a novel route toward the batch-production of monolayer WS2 via the introduction of metal foil substrates but also opens up its direct application for facile HER.
