Abstract The β-ZnMoO4/MWCNT nanocrystal composites were synthesized using hydrothermal method. The physicochemical properties such as structure, morphology and bandgap of synthesized photocatalysts were characterized using PXRD, UV-vis DRS, FTIR, FT-Raman, SEM and TEM analytical methods. PXRD pattern shows the peak shift in the case of synthesized ZnMoO4/MWCNT which confirms the formation of nanocomposites. Moreover, the strong absorbance in UV region which was evidenced in UV-vis DRS spectra for all the case of synthesized ZnMoO4 and ZnMoO4/MWCNT composites. From the SEM and TEM images, the MWCNT was found to have adhered over the ZnMoO4 nanocrystals. Compared to bare β-ZnMoO4, β-ZnMoO4/MWCNT nanocrystal composites exhibited significant higher photocatalytic activity under ultraviolet light emitting diodes (UVLEDs) irradiation for the degradation of nitrobenzene (NB; 2.606 × 10−4 M). This may be due to the effective charge transfer in the composite and optimized electron hole pair recombination. The photocatalytic activity of the synthesized photocatalysts was also studied under visible LEDs and it is observed that the photocatalytic degradation of NB was 97%, 77%, 65% and 52% under the irradiation of UV, blue, green, and red LEDs respectively.

中文翻译：

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在紫外发光二极管 (LED) 下使用 MWCNT/β-ZnMoO4 复合材料增强光催化降解硝基苯

摘要 采用水热法合成了β-ZnMoO4/MWCNT纳米晶复合材料。使用PXRD、UV-vis DRS、FTIR、FT-Raman、SEM和TEM分析方法表征合成光催化剂的结构、形貌和带隙等理化性质。PXRD 图显示合成 ZnMoO4/MWCNT 情况下的峰位移，这证实了纳米复合材料的形成。此外，对于合成的 ZnMoO4 和 ZnMoO4/MWCNT 复合材料的所有情况，在 UV-vis DRS 光谱中都证明了在 UV 区域的强吸收。从 SEM 和 TEM 图像中，发现 MWCNT 粘附在 ZnMoO4 纳米晶体上。与裸 β-ZnMoO4 相比，β-ZnMoO4/MWCNT 纳米晶复合材料在紫外发光二极管 (UVLED) 照射下对硝基苯 (NB; 2.606 × 10−4 M) 的降解表现出显着更高的光催化活性。这可能是由于复合材料中的有效电荷转移和优化的电子空穴对复合。在可见光 LED 下研究了合成光催化剂的光催化活性，观察到在 UV、蓝色、绿色和红色 LED 的照射下，NB 的光催化降解率分别为 97%、77%、65% 和 52%。