K_3V_5O_(14)的合成及光催化性能和吸附性能
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摘要
采用固相合成法制备出K_3V_5O_(14),利用X射线粉末衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)表征了其结构和形貌。研究了反应温度和反应时间对K_3V_5O_(14)的结构、形貌和紫外可见吸收光谱的影响。探讨了材料的光催化性能和吸附性能,结果表明:在光催化性能测试中,具有层状结构的K_3V_5O_(14)对亚甲基蓝(MB)的光降解作用较弱,75 min内降解率低于10%;但K_3V_5O_(14)对亚甲基蓝染料表现出较高的选择性及吸附性能,其最佳投入量为0.5 g·L~(-1),在45 min时对亚甲基蓝的吸附率可达84.46%;吸附动力学拟合结果显示,K_3V_5O_(14)对亚甲基蓝的吸附过程满足准二级吸附动力学,最大吸附容量为75.19 mg·g~(-1)。
K _3V_5O_(14) was prepared via solid phase method and characterized by powder X-ray diffraction(PXRD), scanning electron microscope(SEM) and transmission electron microscope(TEM). The influences of reaction temperatures and times for the structure, morphology and UV-Vis diffuse reflectance spectroscope of K_3V_5O_(14) were studied. The photocatalytic activity and adsorption performance were tested in details. The results show the photocatalytic activity of K_3V_5O_(14) with layer structure is weak by the degradation of methylene blue(MB) under visible light and the degradation rate is lower than 10% in 75 min. However, the adsorption performance is higher and MB is selected and adsorbed from cationic dyes including MB, methyl orange and Rhodamine B. The adsorption rate is 84.46% at 45 min when the optimal dosage of adsorbent is 0.5 g·L~(-1). The adsorption kinetics follows the pseudo-second-order kinetic models and the maximum adsorption capacity is 75.19 mg·g~(-1).
K _3V_5O_(14) was prepared via solid phase method and characterized by powder X-ray diffraction(PXRD), scanning electron microscope(SEM) and transmission electron microscope(TEM). The influences of reaction temperatures and times for the structure, morphology and UV-Vis diffuse reflectance spectroscope of K_3V_5O_(14) were studied. The photocatalytic activity and adsorption performance were tested in details. The results show the photocatalytic activity of K_3V_5O_(14) with layer structure is weak by the degradation of methylene blue(MB) under visible light and the degradation rate is lower than 10% in 75 min. However, the adsorption performance is higher and MB is selected and adsorbed from cationic dyes including MB, methyl orange and Rhodamine B. The adsorption rate is 84.46% at 45 min when the optimal dosage of adsorbent is 0.5 g·L~(-1). The adsorption kinetics follows the pseudo-second-order kinetic models and the maximum adsorption capacity is 75.19 mg·g~(-1).
引文
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