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Photocatalytic activity of the (NH4)2V6O16/g-C3N4 composite catalysts for water splitting applications
Catalysis Today ( IF 5.2 ) Pub Date : 2018-06-18 , DOI: 10.1016/j.cattod.2018.06.024
Yu-Sheng Lai , Yong-Ming Dai , Jih-Mirn Jehng

A hydrothermal method was used to prepare a lozence shape like (NH4)2V6O16 photocatalyst to split water into hydrogen. The energy gap of the (NH4)2V6O16 is about 2.7ev and the absorption wavelength is about 350–800 nm. In order to modify and enhance the photocatalytic reactivity of the (NH4)2V6O16, a graphitic carbon nitride (g-C3N4) possessing higher of lone pairs that can excite electron to combine with H+ and decrease electron-electronic hole recombination was added into the lozence shape like (NH4)2V6O16 to form a composite material. Thus, the synsthesis of the lozence shape like (NH4)2V6O16/g-C3N4 photocatalysts were controlled by the pH value, hydrothermal temperature, and the g-C3N4 concentration. For the photocatalytic reactivity of catalysts, a self-assemble reactor equipped with GC-TCD is used to analyze the water splitting efficiency. The optimum conditions to synthesize pure (NH4)2V6O16 are the acidic environment of pH = 3, the hydrothermal temperature of 200 °C, and the hydrothermal time of 4 h. The optimum concentration of g-C3N4 in the (NH4)2V6O16/g-C3N4 composite is 14 wt% and the accumulative concentration of hydrogen production reaches to the highest value of 2300 μmol/g cat.



中文翻译:

(NH 42 V 6 O 16 / gC 3 N 4复合催化剂在水分解应用中的光催化活性

使用水热法制备像(NH 42 V 6 O 16这样的光亮形状的光催化剂,将水分解成氢。(NH 42 V 6 O 16的能隙约为2.7ev,吸收波长约为350-800 nm。为了修饰和增强(NH 42 V 6 O 16的光催化反应性,具有更高孤对对能激发电子与H +结合的石墨氮化碳(gC 3 N 4)。将减少的电子-电子空穴复合添加到像(NH 42 V 6 O 16这样的惰性形状中以形成复合材料。因此,通过pH值,水热温度和gC 3 N 4的浓度来控制像(NH 42 V 6 O 16 / gC 3 N 4的光亮形状的合成。对于催化剂的光催化反应性,使用配有GC-TCD的自组装反应器来分析水分解效率。合成纯(NH 42的最佳条件V 6 O 16是pH = 3的酸性环境,200°C的水热温度和4 h的水热时间。(NH 42 V 6 O 16 / gC 3 N 4复合物中gC 3 N 4的最佳浓度为14 wt%,产氢的累积浓度达到最高值2300μmol/ g cat。

更新日期:2018-06-18
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