Durable and inexpensive graphitic carbon nitride(g-C_(3)N_(4))demonstrates great potential for achieving efficient photocatalytic hydrogen evolution reduction(HER).To further improve its activity,g-C_(3)N_(4)was subje...Durable and inexpensive graphitic carbon nitride(g-C_(3)N_(4))demonstrates great potential for achieving efficient photocatalytic hydrogen evolution reduction(HER).To further improve its activity,g-C_(3)N_(4)was subjected to atomic-level structural engineering by doping with transition metals(M=Fe,Co,or Ni),which simultaneously induced the formation of metal-N active sites in the g-C_(3)N_(4)framework and modulated the bandgap of g-C_(3)N_(4).Experiments and density functional theory calculations further verified that the as-formed metal-N bonds in M-doped g-C_(3)N_(4)acted as an"electron transfer bridge",where the migration of photo-generated electrons along the bridge enhanced the efficiency of separation of the photogenerated charges,and the optimized bandgap of g-C_(3)N_(4)afforded stronger reduction ability and wider light absorption.As a result,doping with either Fe,Co,or Ni had a positive effect on the HER activity,where Co-doped g-C_(3)N_(4)exhibited the highest performance.The findings illustrate that this atomic-level structural engineering could efficiently improve the HER activity and inspire the design of powerful photocatalysts.展开更多
ASP/H_(2)O_(2)/EDTA-Mg^(2+)烷基糖苷脱色工艺中,ASP是影响消光系数的重要因素,其次是ASP/H_(2)O_(2)摩尔比与温度,EDTA-Mg^(2+)的影响最弱。优化的脱色条件为:100 g 50%烷基糖苷溶液ASP的添加量16.5 g,ASP与H_(2)O_(2)的摩尔比0.55,ED...ASP/H_(2)O_(2)/EDTA-Mg^(2+)烷基糖苷脱色工艺中,ASP是影响消光系数的重要因素,其次是ASP/H_(2)O_(2)摩尔比与温度,EDTA-Mg^(2+)的影响最弱。优化的脱色条件为:100 g 50%烷基糖苷溶液ASP的添加量16.5 g,ASP与H_(2)O_(2)的摩尔比0.55,EDTA-Mg^(2+)为0.4 g,温度50℃。对脱色后烷基糖苷的固含量、残醇含量、pH值、黏度、平均聚合度、灰分含量等检测结果显示,各项指标均符合烷基糖苷国标。展开更多
文摘Durable and inexpensive graphitic carbon nitride(g-C_(3)N_(4))demonstrates great potential for achieving efficient photocatalytic hydrogen evolution reduction(HER).To further improve its activity,g-C_(3)N_(4)was subjected to atomic-level structural engineering by doping with transition metals(M=Fe,Co,or Ni),which simultaneously induced the formation of metal-N active sites in the g-C_(3)N_(4)framework and modulated the bandgap of g-C_(3)N_(4).Experiments and density functional theory calculations further verified that the as-formed metal-N bonds in M-doped g-C_(3)N_(4)acted as an"electron transfer bridge",where the migration of photo-generated electrons along the bridge enhanced the efficiency of separation of the photogenerated charges,and the optimized bandgap of g-C_(3)N_(4)afforded stronger reduction ability and wider light absorption.As a result,doping with either Fe,Co,or Ni had a positive effect on the HER activity,where Co-doped g-C_(3)N_(4)exhibited the highest performance.The findings illustrate that this atomic-level structural engineering could efficiently improve the HER activity and inspire the design of powerful photocatalysts.
文摘ASP/H_(2)O_(2)/EDTA-Mg^(2+)烷基糖苷脱色工艺中,ASP是影响消光系数的重要因素,其次是ASP/H_(2)O_(2)摩尔比与温度,EDTA-Mg^(2+)的影响最弱。优化的脱色条件为:100 g 50%烷基糖苷溶液ASP的添加量16.5 g,ASP与H_(2)O_(2)的摩尔比0.55,EDTA-Mg^(2+)为0.4 g,温度50℃。对脱色后烷基糖苷的固含量、残醇含量、pH值、黏度、平均聚合度、灰分含量等检测结果显示,各项指标均符合烷基糖苷国标。
