三维g-C_3N_4泡沫负载Cu(OH)_2纳米片的制备及其光催化还原CO_2性能
Preparation of 3Dg-C_3N_4 foam supported Cu(OH)_2 nanosheets for photocatalytic CO_2 reduction
查看参考文献30篇
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文摘
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为了改善g-C_3N_4光催化还原CO_2过程中的气体传质、吸附和光生电荷分离效率,分别从泡沫孔结构构筑和构建异质结两方面进行光催化材料设计。采用表面活性剂发泡法制备g-C_3N_4泡沫(g-C_3N_4Foam),以此为基体通过化学镀铜和氢氧化处理制备g-C_3N_4泡沫负载Cu(OH)_2纳米片(Cu(OH)_2/CNF)复合材料,对其结构和光催化性能进行分析。结果表明:g-C_3N_4Foam和Cu(OH)_2/CNF均展现出发达的三维微米孔网络结构,这种结构可从动力学层面优化CO_2在气-固催化反应中的传质和吸附,使CO_2吸附容量分别达到3.97cm~3/g和3.59cm~3/g,为g-C_3N_4粉末的2.96倍和2.68倍;同时,Cu(OH)_2/CNF样品中还形成大量二维Cu(OH)_2纳米片结构,不仅可以拓宽复合材料的光利用范围,还可通过g-C_3N_4/Cu(OH)_2异质结的构建促进光生电子向Cu(OH)_2表面转移,提升光生电荷分离效率;制备的Cu(OH)_2/CNF复合样品CO产率达到11.041μmol·g~(-1)·h~(-1),为g-C_3N_4Foam和g-C_3N_4粉末样品的2.76倍和6.83倍。 |
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其他语种文摘
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To optimize the gas transfer,adsorption and photo-generated charge separation in the process of photocatalytic CO_2 reduction by g-C_3N_4,the photocatalytic materials were designed from the aspects of foam pore structure and heterojunction construction.The typical g-C_3N_4 foam was first constructed using surfactant foaming method,and then Cu(OH)_2 nanosheets were loaded to prepare the Cu(OH)_2/CNF composites with projects of electroless copper plating and hydrogen oxidation treatment.The structure and photocatalytic properties of the as-prepared samples were investigated. The results show that g-C_3N_4 foam and Cu(OH)_2/CNF all demonstrate developed structures with 3D micron pore frameworks,which is conducive to improving CO_2 diffusion and adsorption at dynamics during gas-solid catalytic process.The adsorption amounts of CO_2 for g-C_3N_4 foam and Cu(OH)_2/CNF are respectively 3.97cm~3/g and 3.59cm~3/g,which are 2.96 times and 2.68 times respectively higher than that of pure g-C_3N_4 powder.Moreover,many Cu(OH)_2 nanosheets are also formed in the Cu(OH)_2/CNF samples which provide a way to simultaneously broaden light absorption and form heterojunction between g-C_3N_4 and Cu(OH)_2.This heterojunction can accelerate the separation of photo-generated e~——h~+and make photo-generated electrons transfer from g-C_3N_4 to Cu(OH)_2.As a result,the Cu(OH)_2/CNF has demonstrated optimal photocatalytic activity with CO production rate at 11.041μmol·g~(-1)·h~(-1),which is 2.76 times and 6.83 times respectively higher than that of g-C_3N_4 foam and g-C_3N_4 powder. |
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来源
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材料工程
,2023,51(4):141-150 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000120
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关键词
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g-C_3N_4泡沫
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Cu(OH)_2纳米片
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CO_2吸附
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光生电荷分离
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光催化还原CO_2
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地址
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武汉科技大学, 湖北省省部共建耐火材料与冶金国家重点实验室, 武汉, 430081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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化学 |
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基金
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国家自然科学基金
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湖北省自然科学基金
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湖北省教育厅项目
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文献收藏号
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CSCD:7480413
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