Galedari Naghmeh Abuali, Rahmani Mohammad, Tasbihi Minoo
Department of Chemical Engineering, Amirkabir University of Technology, Mahshahr Campus, Mahshahr, Iran.
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran.
Environ Sci Pollut Res Int. 2017 May;24(14):12655-12663. doi: 10.1007/s11356-016-7888-2. Epub 2016 Oct 24.
In the current study, ZnO@SiO core-shell structured catalyst was synthesized for photocatalytic degradation of phenol from aqueous samples. The synthesized catalyst was characterized by Fourier transform infrared spectra, X-ray diffraction, energy-dispersive X-ray spectroscopy, UV-Vis-NIR diffuse reflectance spectroscopy, transmission electron microscopy, BET surface area, zeta potential, and field emission scanning electron microscopy. The effect of catalyst loading, initial phenol concentration, pH, UV light intensity and weight ratio of ZnO/(SiO + ZnO) were studied towards photocatalytic degradation of phenol. Moreover, photocatalytic activities of bare ZnO and ZnO@SiO were compared. The results advocated that ZnO@SiO catalyst showed high photocatalytic performance for degradation of phenol (96 % after 120 min) at an initial pH of 5.9, catalyst loading of 0.5 g/L and initial phenol concentration of 25 mg/L. Increase in the weight ratio of ZnO/(SiO + ZnO) from 0.2 to 0.33 significantly enhanced the photodegradation of phenol from 84 to 94 %. It was also found that photocatalytic activity of ZnO@SiO was higher than bare ZnO nanoparticles. Graphical abstract ᅟ.
在当前研究中，合成了ZnO@SiO核壳结构催化剂用于光催化降解水样中的苯酚。通过傅里叶变换红外光谱、X射线衍射、能量色散X射线光谱、紫外-可见-近红外漫反射光谱、透射电子显微镜、BET比表面积、zeta电位和场发射扫描电子显微镜对合成的催化剂进行了表征。研究了催化剂负载量、初始苯酚浓度、pH值、紫外光强度以及ZnO/(SiO + ZnO)的重量比对苯酚光催化降解的影响。此外，还比较了裸ZnO和ZnO@SiO的光催化活性。结果表明，在初始pH值为5.9、催化剂负载量为0.5 g/L和初始苯酚浓度为25 mg/L时，ZnO@SiO催化剂对苯酚降解表现出高光催化性能（120分钟后降解率为96%）。ZnO/(SiO + ZnO)的重量比从0.2增加到0.33，显著提高了苯酚的光降解率，从84%提高到94%。还发现ZnO@SiO的光催化活性高于裸ZnO纳米颗粒。图形摘要ᅟ。
