收稿日期: 2024-01-07
网络出版日期: 2024-02-08
基金资助
辽宁省教育厅2022年高等学校基本科研项目面上项目(LJKM20221989)
Study on photoelectric performance analysis of g-C3N5 nanorods and removal of Cr（Ⅵ） and methylene blue
Received date: 2024-01-07
Online published: 2024-02-08
为了实现Cr（Ⅵ）和染料废水的绿色高效降解，通过KBr诱导的方法制备了具有优异光催化活性的一维富氮石墨相氮化碳纳米棒（1D g-C3N5），采用XRD、FT-IR、TEM、UV-vis DRS、PL、TPC和EIS等表征技术对1D g-C3N5的晶型、基团、形貌、光化学性质和电化学性质进行了表征，并对可见光下光催化去除Cr（Ⅵ）和降解亚甲基蓝（MB）性能进行了评价。结果表明，通过KBr诱导形貌调控的方法提高了材料的比表面积，拓宽了光谱吸收范围，提高了可见光吸收和转化能力，有效促进了光生载流子的分离，表现出较低的表面/界面电阻值。与块状g-C3N5相比，1D g-C3N5的光催化活性得到了显著提高，可见光照射60 min，1D g-C3N5对Cr（Ⅵ）的去除率和MB的降解率分别达到了97.6%和98.8%，且循环使用5次后仍具有良好的稳定性。活性基团实验结果表明，光催化降解MB体系的主要活性基团是·O2-和h+，Cr（Ⅵ）的去除得益于e-的作用。通过能带结构计算提出了1D g-C3N5光催化还原Cr（Ⅵ）和去除MB的光催化机理。
崔向东 , 刘思乐 . g-C3N5纳米棒光电性能分析及对Cr（Ⅵ）和亚甲基蓝去除的研究[J]. 无机盐工业, 2024 , 56(10) : 159 -168 . DOI: 10.19964/j.issn.1006-4990.2024-0011
In order to achieve green and efficient degradation of Cr（Ⅵ） and dye wastewater，one⁃dimensional nitrogen⁃rich graphite phase carbon nitride nanorods（1D g-C3N5） with excellent photocatalytic activity were prepared by KBr-induced method.The crystal structure，group，morphology，photochemical properties and electrochemical properties of 1D g-C3N5 were characterized by XRD，FT-IR，TEM，UV-vis DRS，PL，TPC and EIS.The photocatalytic removal of Cr（Ⅵ） and degradation of methylene blue（MB） under visible light were evaluated.The results showed that the specific surface area of the material was increased by the KBr-induced morphology control method，the spectral absorption range was broadened，the visible light absorption and conversion ability was improved，and the separation of photogenerated carriers was effectively promoted，showing a lower surface/interface resistance value.The photocatalytic activity of 1D g-C3N5 was significantly improved compared with bulk g-C3N5.After visible light irradiation for 60 min，the removal rate of Cr（Ⅵ） and the degradation rate of MB by 1D g-C3N5 reached 97.6% and 98.8%，respectively.Moreover，1D g-C3N5 still had good stability after 5 cycles.The results of the active groups showed that the main active groups of the photocatalytic system were ·O2- and h+，the removal of Cr（Ⅵ） benefited from the effect of e-.The photocatalytic mechanism of 1D g-C3N5 photocatalytic reduction of Cr（Ⅵ） and removal of MB was proposed by band structure calculation.
Key words： KBr induction; 1D g-C3N5; photocatalysis; Cr（Ⅵ）; methylene blue
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