CoNi bimetallic co-catalyst decorated graphitic-phase carbon nitride preparation and photocatalytic properties
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摘要: 采用简单的化学还原法在g-C3N4纳米片上原位合成了一种小尺寸CoNi双金属助催化剂并研究了其光催化活性。采用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外可见漫反射光谱(UV-vis DRS)、X射线光电子能谱(XPS)、光致发光(PL)、电化学阻抗(EIS)等手段对制备的CoNi/g-C3N4的理化性能进行了表征。光催化降解RhB实验表明,CoNi双金属助催化剂能有效提高g-C3N4中光生载流子的分离效率,从而提高光催化活性。当CoNi物质的量比为1∶1时,CoNi/g-C3N4的催化活性最高,其降解速率为0.01633 min−1,在可见光照射下比g-C3N4提高3.9倍,该光催化剂在五次循环后仍能保持良好光催化活性, 该反应的主要活性物种为超氧自由基(
$\cdot{\rm{ O}}^-_2 $ )。Abstract: In this study, a small-sized CoNi bimetallic co-catalyst was synthesized in situ on g-C3N4 nanosheets using a simple chemical reduction method. The physicochemical properties of the prepared CoNi/g-C3N4 were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and electrochemical impedance spectroscopy (EIS). The photocatalytic degradation of RhB showed that the CoNi bimetallic co-catalyst could effectively improve the separation efficiency of photogenerated carriers in g-C3N4, thus enhancing the photocatalytic activity. The highest catalytic activity of CoNi/g-C3N4 was achieved when the molar ratio of CoNi was 1∶1, with a degradation rate of 0.01633 min−1, which was 3.9 times higher than that of normal g-C3N4 under visible light irradiation. The photocatalyst maintained good photocatalytic activity after five cycles. The main active species of the reaction is the superoxide radical ($\cdot {\rm{O}}^-_2 $ ).-
Key words:
- carbon nitride /
- bimetallic co-catalyst /
- photocatalysis
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表 1 不同催化剂对RhB降解拟合曲线的k值
Table 1 k value of fitting curve of RhB degradation by different catalysts
Catalyst g-C3N4 CoNi/g-C3N4 Ni/g-C3N4 Co/g-C3N4 k/min−1 0.00419 0.01633 0.00966 0.00874 表 2 不同复合材料在可见光照射下光催化降解RhB的性能比较
Table 2 Comparison of photocatalytic removal of RhB under visible light irradiation using different composite materials
Catalyst Light source Amount of photocatalysis/mg Pollutant Time/min Removal efficiency/% Ref. CoNi/g-C3N4 Halide lamp (250 W) 20 RhB 180 95.4 this work Bi2O3/g-C3N4 Mercury lamp (300 W) 25 RhB 180 83 [32] g-C3N4-BiVO4-Ag Xe lamp (500 W) 50 RhB 150 76.3 [33] LaFeO3/g-C3N4 Xe lamp (200 W) 50 RhB 120 58.4 [34] g-C3N4/ZnO/Cu2O Xe lamp (500 W) 50 RhB 100 91.4 [35] g-C3N4@UiO-66 Mercury lamp (500 W) 20 RhB 140 99 [36] ZnO/g-C3N4 Xe lamp (500 W) 50 RhB 120 51.3 [37] -
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