One step method of structure engineering porous graphitic carbon nitride for efficient visible-light photocatalytic reduction of Cr（Ⅵ）
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第12期
论文作者：Xueru Chen Yin Zhang Dashui Yuan Wu Huang Jing Ding Hui Wan Wei-Lin Dai Guofeng Guan
摘 要：Porous g-C3 N4 nanosheets（PCN） were prepared by the nickel-assisted one-step thermal polymerization method.Hydrogen（H2） which was produced by the reaction between nickel（Ni） foam and ammonia（NH3） defined the structure and properties of PCN.During the formation of PCN,the participation of H2 not only enhanced the spacing between layers but also boosted the specific surface area that more active sites were exposed.Additionally,H2 promoted pores formation in the nanosheets,which was beneficial to the transfer of photons through lamellar structure and improved the absorption efficiency of visible light.Remarkably,the obtained PCN possessed better Cr（Ⅵ） photocatalytic reduction efficiency than pure g-C3 N4.The reaction rate constant（k） of PCN(0.013 min-1) was approximately twice that of bare g-C3 N4(0.007 min-1).Furthermore,the effects of original pH and concentration of Cr（Ⅵ）-containing solution on re moval efficiency of Cr（Ⅵ） were explored.A possible photocatalytic mecha nism was proposed based on the experiments of radical scavengers and photoelectrochemical characterizations.
Xueru Chen1，Yin Zhang1，Dashui Yuan1，Wu Huang1，Jing Ding1，Hui Wan1，Wei-Lin Dai2，Guofeng Guan1
1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University2. Department of Chemistry & Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University
摘 要：Porous g-C3 N4 nanosheets（PCN） were prepared by the nickel-assisted one-step thermal polymerization method.Hydrogen（H2） which was produced by the reaction between nickel（Ni） foam and ammonia（NH3） defined the structure and properties of PCN.During the formation of PCN,the participation of H2 not only enhanced the spacing between layers but also boosted the specific surface area that more active sites were exposed.Additionally,H2 promoted pores formation in the nanosheets,which was beneficial to the transfer of photons through lamellar structure and improved the absorption efficiency of visible light.Remarkably,the obtained PCN possessed better Cr（Ⅵ） photocatalytic reduction efficiency than pure g-C3 N4.The reaction rate constant（k） of PCN(0.013 min-1) was approximately twice that of bare g-C3 N4(0.007 min-1).Furthermore,the effects of original pH and concentration of Cr（Ⅵ）-containing solution on re moval efficiency of Cr（Ⅵ） were explored.A possible photocatalytic mecha nism was proposed based on the experiments of radical scavengers and photoelectrochemical characterizations.
关键词：
