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开发利用太阳能解决日益严重的环境危机迫在眉睫，为了提高对太阳光的利用率和光催化剂的性能，采用原位生长并结合表面静电吸附的方法制备三元复合材料，先利用水热合成MoS2/RGO二元异质结复合材料，再根据材料等电点调变溶液pH值制造MoS2与Fe_2O3表面电荷同性、而与RGO表面电荷异性，进而构筑MoS2/RGO/Fe_2O3全固态Z-Scheme光催化剂。通过扫描电镜和透射电子显微镜观察发现，MoS2纳米花球和Fe_2O3纳米颗粒均匀分布在二维片层结构的电子介体RGO表面，MoS2和Fe_2O3分别与RGO形成稳定的异质结构，充分证明此种方式构建复杂三元复合材料的可行性。RGO基全固态Z-Scheme光催化剂在模拟太阳光照射下具有优异的光催化还原降解性能，以无机重金属Cr(VI)溶液作为降解指示剂，60min内全固态Z-Scheme光催化剂中活性最佳的为MR0.43F试样，其光还原降解效率是二元复合材料MoS2/RGO的1.5倍。这种全固态Z-Scheme光催化剂兼具宽光谱吸收、高效光生载流子分离效率和表面化学反应效率，改性后的光催化性能得到显著提升，这一光催化设计路线为水环境处理及清洁能源制备提供了新方向。
Abstract：It is imminent to develop and utilize solar energy to solve the increasingly serious environmental crisis. In order to improve the utilization rate of sunlight and the performance of photocatalysts, this work innovatively proposed to prepare Z-Scheme Mo S2/RGO/Fe_2O3 ternary composites by an in-situ growth method combined with a surface electrostatic adsorption method.MoS2/RGO hetero-structured binary composites were firstly synthesized by a hydrothermal method, and then all-solid-state Z-Scheme MoS2/RGO/Fe_2O3 photocatalyst was constructed via adjusting the solution pH value to create the same charges of MoS_2and Fe_2O3 and the opposite charges of RGO and MoS2. According to the results by scanning electron microscopy and transmission electron microscopy, MoS2 nanosheets and Fe_2O3 nanoparticles are uniformly distributed on the surface of two-dimension RGO, and Mo S2 nanosheets and Fe_2O3 nanoparticles display a stable hetero-structure onto RGO nanosheets. The RGO-based all-solid-state Z-Scheme photocatalyst possesses a superior photocatalytic reduction degradation performance under the simulated solar-driven illumination. Especially, the all-solid-state Z-Scheme photocatalyst MR0.43F has the optimum photoreduction degradation efficiency within 60 min for heavy metal Cr (VI) in a solution as a degradation indicator, which is 1.5 times greater than that of binary Mo S2/RGO composites. The all-solid-state Z-Scheme photocatalyst has wide-spectrum absorption, high separation efficiency of photogenerated carriers and surface chemical reaction efficiency, thus improving the photocatalytic properties.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20210792
中图分类号:O643.36;O644.1
引用信息:
[1]焦永欣,王姝,殷佳楠,等.全固态Z-Scheme光催化剂MoS_2/RGO/Fe_2O_3的构筑及性能[J].硅酸盐学报,2022,50(05):1263-1274.DOI:10.14062/j.issn.0454-5648.20210792.
基金信息:
黑龙江省自然科学基金面上项目(E2018042); 广东省联合青年基金项目(2019A1515111019); 理工英才基金项目(LGYC2018JC006)
2022-04-01
2022-04-01
2022-04-01