Room-temperature solid phase surface engineering of BiOI sheets stacking g-C_(3)N_(4) boosts photocatalytic reduction of Cr(Ⅵ)

Cr(Ⅵ)-based compounds pollution have attracted global concern due to serious harm to humans and environment.Hence,it is crucial to exploit an effective technique to eliminate Cr(Ⅵ)in water.Herein,we in-situ grown BiOI on graphitic carbon nitride to prepare the BiOI/g-C_(3)N_(4)(BCN)direct Z-scheme heterojunction by solid phase engineering method at room temperature.Experimental result shown the photocatalytic activity of pure BiOI were obviously enhanced by constructing Z-scheme BCN heterostructure,and BCN-3 heterostructure exhibited the optimal photocatalytic degradation of RhB with 98%yield for 2.5 h and reduction of Cr(Ⅵ)with more than 99%yield for 1.5 h at pH=2.Stability test shows BCN-3 still kept more than 98%reduction efficiency after 6 cycles.In addition,we also studied the reduction mechanism that shown the.O_(2)^(-)radicals essentially helped to reduce the Cr(Ⅵ)in aqueous solution under illumination,verified the direct Z-scheme charge transfer path by X-ray photoelectron spectroscopy(XPS)and the free radical trapping experiment.The work open a new way for rationally designing photocatalyst heterostructure to reduce Cr(Ⅵ)to Cr(Ⅲ).

Sensitivity Study on Durability Variables of Marine Concrete Structures

为了在海洋的水泥的耐久性上学习参数的影响，组织，参数敏感分析在这份报纸被学习。与 Ficks，散开和确定的敏感分析方法(DSA ) 的第二法律，明显的表面氯化物内容的敏感因素，明显的氯化物散开系数和它的时间依赖者变细因素被分析。分析的结果证明具体耐久性上的设计变量的影响是不同的。氯化物散开系数的敏感因素和它的时间依赖者变细因素的价值比其它高。在氯化物散开系数和它的时间依赖者变细系数的相对更少错误在具体耐久性设计和生活预言导致一个更大的错误。根据概率敏感分析(PSA ) ，吝啬的价值的影响和耐久性失败概率上的具体耐久性设计变量的变化被学习。学习的结果提供具体耐久性设计和生活预言变量的重要性的量的措施。氯化物散开系数和它的时间依赖者变细因素在海洋的具体结构的耐久性的可靠性上有更多的影响，这被结束。在耐久性设计和海洋的具体结构的生活预言，减少这项措施和耐久性设计变量的统计错误是很重要的。