g-C3N4/Bi/Bi2WO6光催化材料的协同改性研究

以五水合硝酸铋Bi（NO₃）₃·5H₂O]为铋源、二水合钨酸钠（Na₂WO₄·2H₂O）为钨源通过水热法制备出多孔钨酸铋（Bi₂WO₆），并以纳米板条堆叠形成椭球结构的类石墨相氮化碳（g-C₃N₄）为基底通过溶剂热法在原位还原金属铋（Bi）的同时制备出具有Z型异质结构的g-C₃N₄/Bi/Bi₂WO₆（CN/B/BWO）复合光催化材料。采用X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、氮气吸附-脱附等温线（BET）、紫外-可见吸收光谱（UV-Vis）和光致发光（PL）光谱等检测手段对制备的样品进行了表征。结果表明，金属铋可以作为类石墨相氮化碳和钨酸铋之间的电荷转移媒介，其产生的表面等离子体共振（SPR）效应可协同增强光生电子-空穴对的分离效率和载流子的迁移率，从而提升样品的光催化活性。采用350 W氙灯照射30 min，样品CN/B/BWO-0.7对盐酸四环素（TC-H）的降解率达到99.94%，并对其降解机理进行了探讨。

Study on synergistic modification of g-C3N4/Bi/Bi2WO6 photocatalyst

By using Bi（NO₃）₃·5H₂O as the bismuth source and Na₂WO₄·2H₂O as the tungsten source，porous Bi₂WO₆ was prepared by hydrothermal method，and g-C₃N₄/Bi/Bi₂WO₂₆（CN/B/BWO） composite photocatalyst with Z-type heterostructure was prepared by solvothermal method with g-C₃N₄ with ellipsoidal structure formed by stacking nano strips as substrate and in situ reduction of metal Bi.The prepared samples were characterized by X-ray diffraction（XRD），scanning electron microscopy（SEM），transmission electron microscopy（TEM），nitrogen adsorption desorption isotherm（BET），ultraviolet visible absorption spectrum（UV-vis） and photoluminescence spectrum（PL）.The results showed that the metal Bi could be used as the charge transfer medium between g-C₃N₄ and Bi₂WO₆.The surface plasmon resonance（SPR） effect generated by metal Bi could synergistically enhance the separation efficiency of photogenerated electron-hole pairs and the mobility of carriers，thereby improving the photocatalytic activity of the samples.Under the irradiation of 350 W xenon lamp for 30 min，the degradation rate of tetracycline hydrochloride（TC-H） by sample CN/B/BWO-0.7 was 99.94%，and the degradation mechanism was discussed.