Hydrogen peroxide(H_(2)O_(2))photoproduction in seawater with metal-free photocatalysts derived from biomass materials is a green,sustainable,and ultra environmentally friendly way.However,most photocatalysts are alwa...Hydrogen peroxide(H_(2)O_(2))photoproduction in seawater with metal-free photocatalysts derived from biomass materials is a green,sustainable,and ultra environmentally friendly way.However,most photocatalysts are always corroded or poisoned in seawater,resulting in a significantly reduced catalytic performance.Here,we report the metal-free photocatalysts(RUT-1 to RUT-5)with in-situ generated carbon dots(CDs)from biomass materials(Rutin)by a simple microwave-assisted pyrolysis method.Under visible light(λ≥420 nm,81.6 mW/cm^(2)),the optimized catalyst of RUT-4 is stable and can achieve a high H_(2)O_(2)yield of 330.36μmol/L in seawater,1.78 times higher than that in normal water.New transient potential scanning(TPS)tests are developed and operated to in-situ study the H_(2)O_(2)photoproduction of RUT-4 under operation condition.RUT-4 has strong oxygen(O_(2))absorption capacity,and the O_(2)reduction rate in seawater is higher than that in water.Metal cations in seawater further promote the photo-charge separation and facilitate the photo-reduction reaction.For RUT-4,the conduction band level under operating conditions only satisfies the requirement of O_(2)reduction but not for hydrogen(H2)evolution.This work provides new insights for the in-situ study of photocatalyst under operation condition,and gives a green and sustainable path for the H_(2)O_(2)photoproduction with metal-free catalysts in seawater.展开更多
耕地资源是人类社会赖以生存和发展的物质基础,如今全球人地矛盾突出,耕地面积逐年下降,旱改水无疑是响应我国整治农用地、守住耕地红线和贯彻落实“占优补优,占水田补水田”的有力举措。本文选取CNKI和Web of Science数据库的数据,采...耕地资源是人类社会赖以生存和发展的物质基础,如今全球人地矛盾突出,耕地面积逐年下降,旱改水无疑是响应我国整治农用地、守住耕地红线和贯彻落实“占优补优,占水田补水田”的有力举措。本文选取CNKI和Web of Science数据库的数据,采取文献分析法、归纳统计法对我国旱改水土地整治研究内容进行了综述。结果表明:旱改水的适宜性评价和潜力系数评估,方法繁多,评价标准不一,评测的结果也参差不齐,未形成较为统一的评价体系;现有的关于适宜旱改水的土地类型研究,土地种类单一,代表性不足,甚至还有大量的适宜性土地类型研究处于空白;现有研究多集中于理论潜力研究,现实潜力研究以及理论潜力与现实潜力对比分析方面的研究发文量较少,可以作为旱改水研究的重要发展方向;旱改水土地整治工程技术繁多,现有研究多为广面浅析,对于关键技术的探讨不够深入,缺乏针对性研究。展开更多
基金supported by Natural Science Foundation of Jiangsu Province(No.BK20220028)the National Key Research and Development Program of China(Nos.2020YFA0406104 and 2020YFA0406101)+6 种基金the National Natural Science Foundation of China(Nos.52272043,52271223,52202107,and 52201269)Natural Science Foundation of Jiangsu Province(Nos.BK20210735 and 21KJB430043)the Science and Technology Development Fund,Macao SAR(No.0009/2022/ITP)Shenzhen Science and Technology Plan Project(Collaborative Innovation Special Project,SGDX20220530111203019)Collaborative Innovation Center of Suzhou Nano Science and Technologythe 111 ProjectSuzhou Key Laboratory of Functional Nano and Soft Materials.
文摘Hydrogen peroxide(H_(2)O_(2))photoproduction in seawater with metal-free photocatalysts derived from biomass materials is a green,sustainable,and ultra environmentally friendly way.However,most photocatalysts are always corroded or poisoned in seawater,resulting in a significantly reduced catalytic performance.Here,we report the metal-free photocatalysts(RUT-1 to RUT-5)with in-situ generated carbon dots(CDs)from biomass materials(Rutin)by a simple microwave-assisted pyrolysis method.Under visible light(λ≥420 nm,81.6 mW/cm^(2)),the optimized catalyst of RUT-4 is stable and can achieve a high H_(2)O_(2)yield of 330.36μmol/L in seawater,1.78 times higher than that in normal water.New transient potential scanning(TPS)tests are developed and operated to in-situ study the H_(2)O_(2)photoproduction of RUT-4 under operation condition.RUT-4 has strong oxygen(O_(2))absorption capacity,and the O_(2)reduction rate in seawater is higher than that in water.Metal cations in seawater further promote the photo-charge separation and facilitate the photo-reduction reaction.For RUT-4,the conduction band level under operating conditions only satisfies the requirement of O_(2)reduction but not for hydrogen(H2)evolution.This work provides new insights for the in-situ study of photocatalyst under operation condition,and gives a green and sustainable path for the H_(2)O_(2)photoproduction with metal-free catalysts in seawater.
文摘耕地资源是人类社会赖以生存和发展的物质基础,如今全球人地矛盾突出,耕地面积逐年下降,旱改水无疑是响应我国整治农用地、守住耕地红线和贯彻落实“占优补优,占水田补水田”的有力举措。本文选取CNKI和Web of Science数据库的数据,采取文献分析法、归纳统计法对我国旱改水土地整治研究内容进行了综述。结果表明:旱改水的适宜性评价和潜力系数评估,方法繁多,评价标准不一,评测的结果也参差不齐,未形成较为统一的评价体系;现有的关于适宜旱改水的土地类型研究,土地种类单一,代表性不足,甚至还有大量的适宜性土地类型研究处于空白;现有研究多集中于理论潜力研究,现实潜力研究以及理论潜力与现实潜力对比分析方面的研究发文量较少,可以作为旱改水研究的重要发展方向;旱改水土地整治工程技术繁多,现有研究多为广面浅析,对于关键技术的探讨不够深入,缺乏针对性研究。
