Hydrogen peroxide(H_(2)O_(2)),an environmentally friendly chemical with high value,is extensively used in industrial production and daily life.However,the traditional anthraquinone method for H_(2)O_(2) production is ...Hydrogen peroxide(H_(2)O_(2)),an environmentally friendly chemical with high value,is extensively used in industrial production and daily life.However,the traditional anthraquinone method for H_(2)O_(2) production is associated with a highly energy-consuming and heavily polluting process.Solor-driven photocatalytic evolution of H_(2)O_(2) is a promising,eco-friendly,and energy-efficient strategy that holds great potential to substitute the traditional approach.Here,a ternary photocatalyst,NiS/CdS/Halloysite nanotubes(NiS/CdS/HNTs)is designed and prepared with an earth-abundant clay mineral HNTs as the support and NiS as a co-catalyst.The pivotal roles of HNTs and NiS in the photocatalytic process are elucidated by experiments and theoretical calculations.HNTs serve as the carrier,which allows CdS to be uniformly dispersed onto its surface as small particles,increasing effective contact with H_(2)O and O_(2) for H_(2)O_(2) formation.Simultaneously,it resulted in the formation of a Schottky junction between NiS and CdS,which not only favors photogenerated charges separating efficiently but also provides a unidirectional path to transfer electrons.Consequently,the optimized NiS/CdS/HNTs composite demonstrates an H_(2)O_(2) evolution rate of 380.5μmol·g^(-1)·h^(-1) without adding any sacrificial agent or extra O_(2),nearly 5.0 times that of pure CdS.This work suggests a feasible idea for designing and developing highly active and low-cost solar energy catalytic composite materials.展开更多
采用种子生长法制备金纳米棒(AuNRs)以构建光学传感器,用于Fe^(3+)和Cu^(2+)的高选择性快速可视化检测。在酸性环境中,Fe^(3+)和Cu^(2+)通过与KI溶液反应,将I-氧化成I2。I2刻蚀AuNRs,导致其纵向表面等离子体共振(LSPR)吸收峰蓝移,从而...采用种子生长法制备金纳米棒(AuNRs)以构建光学传感器,用于Fe^(3+)和Cu^(2+)的高选择性快速可视化检测。在酸性环境中,Fe^(3+)和Cu^(2+)通过与KI溶液反应,将I-氧化成I2。I2刻蚀AuNRs,导致其纵向表面等离子体共振(LSPR)吸收峰蓝移,从而实现对Fe^(3+)和Cu^(2+)的检测。结果表明,反应温度为50℃时,添加0.8 mL 0.1 mol·L^(-1)HCl、2 mL AuNRs生长液和20 mmol·L^(-1)KI溶液,与2 mL 500μmol·L^(-1)Fe^(3+)或30μmol·L^(-1)Cu^(2+)反应25或90 min,可将AuNRs刻蚀至LSPR吸收峰消失。该方法对Fe^(3+)和Cu^(2+)检测具有高选择性和准确性,对于Fe^(3+)、Cu^(2+)共存体系的检测,可通过加入适量F-与Fe^(3+)生成配合物[FeF_(6)]^(3-)完成对Fe^(3+)的化学掩蔽,消除Fe^(3+)的干扰,实现共存体系中Cu^(2+)的准确检测。展开更多
文摘Hydrogen peroxide(H_(2)O_(2)),an environmentally friendly chemical with high value,is extensively used in industrial production and daily life.However,the traditional anthraquinone method for H_(2)O_(2) production is associated with a highly energy-consuming and heavily polluting process.Solor-driven photocatalytic evolution of H_(2)O_(2) is a promising,eco-friendly,and energy-efficient strategy that holds great potential to substitute the traditional approach.Here,a ternary photocatalyst,NiS/CdS/Halloysite nanotubes(NiS/CdS/HNTs)is designed and prepared with an earth-abundant clay mineral HNTs as the support and NiS as a co-catalyst.The pivotal roles of HNTs and NiS in the photocatalytic process are elucidated by experiments and theoretical calculations.HNTs serve as the carrier,which allows CdS to be uniformly dispersed onto its surface as small particles,increasing effective contact with H_(2)O and O_(2) for H_(2)O_(2) formation.Simultaneously,it resulted in the formation of a Schottky junction between NiS and CdS,which not only favors photogenerated charges separating efficiently but also provides a unidirectional path to transfer electrons.Consequently,the optimized NiS/CdS/HNTs composite demonstrates an H_(2)O_(2) evolution rate of 380.5μmol·g^(-1)·h^(-1) without adding any sacrificial agent or extra O_(2),nearly 5.0 times that of pure CdS.This work suggests a feasible idea for designing and developing highly active and low-cost solar energy catalytic composite materials.
文摘采用种子生长法制备金纳米棒(AuNRs)以构建光学传感器,用于Fe^(3+)和Cu^(2+)的高选择性快速可视化检测。在酸性环境中,Fe^(3+)和Cu^(2+)通过与KI溶液反应,将I-氧化成I2。I2刻蚀AuNRs,导致其纵向表面等离子体共振(LSPR)吸收峰蓝移,从而实现对Fe^(3+)和Cu^(2+)的检测。结果表明,反应温度为50℃时,添加0.8 mL 0.1 mol·L^(-1)HCl、2 mL AuNRs生长液和20 mmol·L^(-1)KI溶液,与2 mL 500μmol·L^(-1)Fe^(3+)或30μmol·L^(-1)Cu^(2+)反应25或90 min,可将AuNRs刻蚀至LSPR吸收峰消失。该方法对Fe^(3+)和Cu^(2+)检测具有高选择性和准确性,对于Fe^(3+)、Cu^(2+)共存体系的检测,可通过加入适量F-与Fe^(3+)生成配合物[FeF_(6)]^(3-)完成对Fe^(3+)的化学掩蔽,消除Fe^(3+)的干扰,实现共存体系中Cu^(2+)的准确检测。
