AgNi双金属改性多面体钒酸铋的制备及光催化性能

采用简单的水热法制备了多面体钒酸铋（BVO）材料，又通过化学还原法首次在BVO上原位合成了一种小尺寸的AgNi双金属助催化剂并研究了其光催化性能。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、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）光谱、N₂吸附-脱附等手段对制备的AgNi/BVO材料的理化性能进行了表征。结果表明，AgNi双金属广泛负载在这种特殊形貌的BVO多面体表面，大大增加了金属的附着位点，同时AgNi负载也提高了BVO的结晶性。银表面等离子体谐振效应与镍的共格界面效应增强了BVO催化剂对可见光的吸收，增强了光生电子的分离，提高了光催化活性。光催化降解MB （亚甲基蓝）实验表明，当Ag、Ni的质量比为3∶1时，AgNi/BVO的催化活性最高，在可见光照射下其反应速率常数是BVO的5.4倍，该光催化剂在4次循环后仍能保持良好的光催化活性。

Preparation and photocatalytic performance of AgNi bimetallic modified polyhedral bismuth vanadate

Polyhedral bismuth vanadate (BVO) material was prepared using a straightforward hydrothermal method, and then a small-sized AgNi bimetallic co-catalyst was synthesized in situ on the surface of the polyhedral BVO through a chemical reduction method. The photocatalytic performance of the catalyst was studied. The physicochemical properties of the prepared AgNi/BVO material were characterized through various techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, and nitrogen adsorption-desorption analysis. The results indicated that AgNi bimetallic co-catalysts were extensively loaded onto the unique morphology of BVO polyhedra, significantly increasing the metal attachment sites. Simultaneously, the AgNi loading also improved the crystallinity of BVO. The silver surface plasmon resonance effect, in conjunction with the nickel''s lattice interface effect, enhanced the BVO catalyst''s absorption of visible light and improved the separation of photo-generated electrons, thereby increasing the photocatalytic activity. Photocatalytic degradation experiments using MB (methylene blue) as a model pollutant demonstrated that when the ratio was 3:1, AgNi/BVO exhibited the highest catalytic activity, with a reaction rate of 5.4 times higher than that of BVO under visible light irradiation. This photocatalyst retained excellent photocatalytic activity even after four cycles of use.