K+掺杂g-C3N4污泥基复合材料的制备及其光催化性能

Preparation and photocatalytic performance of potassium doped g-C3N4 sludge-based composite

摘要:

以水性油墨废水絮凝污泥、三聚氰胺和碳酸钾为原料，采用煅烧法制备了钾掺杂石墨相氮化碳（g-C3N4）污泥基复合光催化吸附剂（AC/K-CN），并利用X射线衍射（XRD）、紫外-可见漫反射（UV-vis DRS）、傅里叶变换红外（FTIR）光谱、X射线光电子能谱（XPS）、比表面积（BET）、扫描电镜（SEM）和荧光（PL）光谱等对复合材料的晶体结构、形貌和光电性能等进行了表征，同时将复合材料在可见光照射下应用于光催化降解阳离子蓝X-GRRL，进行光催化性能评价。结果表明，AC/K-CN复合催化剂对阳离子蓝X-GRRL的光催化活性明显高于纯g-C3N4或AC，这归因于复合材料的有效电子-空穴分离。与纯g-C3N4和AC相比，AC/K-CN复合催化剂在模拟日光下对质量浓度为20 mg/L的阳离子蓝X-GRRL的脱色率分别提高了43.17%和46.76%。

Abstract:

Potassium doped graphitic carbon nitride (g-C3N4) sludge-based composite photocatalyst adsorbent (AC/K-CN) was prepared by calcination method using flocculation sludge of water-based ink wastewater, melamine and potassium carbonate as raw materials. The crystal structure, morphology and photoelectric properties of the composite were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance (UV-vis DRS), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), specific surface area (BET), scanning electron microscope (SEM) and fluorescence (PL) spectroscopy. Meanwhile, the composite was applied to remove Cationic Blue X-GRRL from aqueous solutions by photocatalyst under visible-light irradiation. The results show that the photocatalytic activity of the AC/K-CN composite catalyst on cationic blue X-GRRL is significantly higher than that of pure g-C3N4 or AC, which is attributed to the effective electron-hole separation of the composite material. Compared with pure g-C3N4 and AC, the AC/K-CN composite catalyst increased the decolorization rate of cationic blue X-GRRL with a mass concentration of 20 mg/L by 43.17% and 46.76% under simulated sunlight.