The fabrication of efficient catalysts to reduce nitrogen(N_(2))to ammonia(NH3)is a significant challenge for artificial N_(2) fixation under mild conditions.In this work,we demonstrated that the simultaneous introduc...The fabrication of efficient catalysts to reduce nitrogen(N_(2))to ammonia(NH3)is a significant challenge for artificial N_(2) fixation under mild conditions.In this work,we demonstrated that the simultaneous introduction of oxygen vacancies(OVs)and Mo dopants into Bi_(5)O_(7)Br nanosheets can significantly increase the activity for photocatalytic N_(2) fixation.The 1 mol% Mo-doped Bi_(5)O_(7)Br nanosheets exhibited an optimal NH_(3) generation rate of 122.9μmol g^(-1) h^(-1) and durable stability,which is attributed to their optimized conduction band position,suitable absorption edge,large number of light-switchable OVs,and improved charge carrier separation.This work provides a promising approach to design photocatalysts with light-switchable OVs for N_(2) reduction to NH_(3) under mild conditions,highlighting the wide application scope of nanostructured BiOBr-based photocatalysts as effective N_(2) fixation systems.展开更多
文摘The fabrication of efficient catalysts to reduce nitrogen(N_(2))to ammonia(NH3)is a significant challenge for artificial N_(2) fixation under mild conditions.In this work,we demonstrated that the simultaneous introduction of oxygen vacancies(OVs)and Mo dopants into Bi_(5)O_(7)Br nanosheets can significantly increase the activity for photocatalytic N_(2) fixation.The 1 mol% Mo-doped Bi_(5)O_(7)Br nanosheets exhibited an optimal NH_(3) generation rate of 122.9μmol g^(-1) h^(-1) and durable stability,which is attributed to their optimized conduction band position,suitable absorption edge,large number of light-switchable OVs,and improved charge carrier separation.This work provides a promising approach to design photocatalysts with light-switchable OVs for N_(2) reduction to NH_(3) under mild conditions,highlighting the wide application scope of nanostructured BiOBr-based photocatalysts as effective N_(2) fixation systems.
文摘目的 观察调Q1064 nm激光联合水光注射及微针治疗黄褐斑的临床疗效。方法 自2023年9月至2024年9月,南京医科大学附属苏州医院皮肤科收治黄褐斑患者104例,随机分为对照组(36例)、观察组1(34例)、观察组2(34例)。在治疗前、治疗后及治疗后6个月时,采用黄褐斑面积及严重指数(melasma area and severity index,MASI)、皮肤光学检测仪、患者的满意率评估疗效。同时记录治疗后的平均恢复时间和并发症发生情况。结果 治疗后3组MASI评分均低于治疗前,观察组总有效率为67.65%(46/68)高于对照组44.44%(16/36),观察组2有效率为73.53%(25/34)高于观察组1有效率61.76%(21/34),差异有统计学意义(P<0.05)。观察组2的平均恢复时间(7.27±1.84)d显著短于观察组1(9.55±2.15)d和对照组(10.82±2.56)d,差异有统计学意义(P<0.05)。治疗后3组并发症的发生率比较,差异有统计学意义(P<0.05)。结论 光电联合水光注射及微针治疗黄褐斑效果显著,且恢复时间较短,安全性较高。
文摘目的:探究调Q1064 nm激光联合强脉冲光对黄褐斑患者皮肤颜色评分和皮肤美学效果的影响。方法:选取2021年1月-2023年1月笔者医院收治的86例女性黄褐斑患者为研究对象,采用便签法随机分为观察组和对照组,各43例。对照组采用强脉冲光治疗,观察组采用调Q1064 nm激光联合强脉冲光治疗,比较治疗6个月后两组患者皮肤美学效果[皮肤黑素指数(Melanin index,MI)、红斑指数(Erythema index,EI)]、皮肤颜色分级及不良反应情况,记录治疗前及治疗6个月后两组患者黄褐斑面积严重指数(Melasma area and severity index,MASI)、皮肤屏障功能(皮脂含量、角质层含水量、经表皮水分流失值)。结果:治疗6个月后,观察组患者MASI、MI及EI指数、皮肤颜色评分明显低于对照组(P<0.05);治疗前及治疗6个月后两组患者皮肤屏障功能指标均无统计学意义(P>0.05),且两组治疗期间不良反应发生率比较均无统计学意义(P>0.05)。结论:调Q1064 nm激光联合强脉冲光能够有效改善患者面部黄褐斑情况,提亮患者肤色,美学效果较好,且无明显不良反应。
