Nasirian Mohsen, Bustillo-Lecompte Ciro Fernando, Mehrvar Mehrab
Graduate Programs in Environmental Applied Science and Management, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada.
Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada.
J Environ Manage. 2017 Jul 1;196:487-498. doi: 10.1016/j.jenvman.2017.03.030. Epub 2017 Mar 24.
The inadequate management practices in industrial textile effluents have a considerable negative impact on the environment and human health due to the indiscriminate release of dyes. Photocatalysis is one of the diverse advance oxidation processes (AOPs) and titanium dioxide (TiO) is recognized for its high oxidation and reduction power. A composite photocatalyst of FeO/TiO is synthesized using different mass ratios of Fe:TiO to improve its photoactivity. The composite photocatalyst is calcined at 300-900 °C. Their photocatalytic activity for the degradation of Congo red (CR) and methyl orange (MO) is investigated by total organic carbon (TOC) analysis. The formation and characterization of the as-prepared composite are studied by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The effect of calcination temperature on the composite FeO/TiO photocatalyst is investigated using Fourier transform infrared spectroscopy (FTIR). The photocatalytic activity and the phase conversion are studied by X-ray diffraction (XRD). The specific surface area of photocatalysts at different calcination temperatures is investigated based on Brunauer-Emmett-Teller (BET) surface area analysis. Results show that at an optimum calcination temperature of 300 °C for the photocatalyst preparation, the specific surface area is maximum and the photocatalyst has the highest photoactivity. Thus, the degradation of organic materials reaches 62.0% for MO and 46.8% for CR in the presence of FeO/TiO (0.01 w:w Fe:TiO) calcined at 300 °C with the highest specific surface area (98.73 m/g). The transformation of TiO from anatase to rutile is facilitated by high temperature and high concentration of iron while high crystallization and particle size increase occur. An optimum calcination temperature of 300 °C is found at which the degradation of typical dyes in textile industries is maximum.
由于染料的随意排放，工业纺织废水管理不善对环境和人类健康产生了相当大的负面影响。光催化是多种高级氧化过程（AOPs）之一，二氧化钛（TiO₂）因其高氧化还原能力而受到认可。使用不同质量比的Fe:TiO₂合成了Fe₂O₃/TiO₂复合光催化剂，以提高其光活性。该复合光催化剂在300 - 900°C下煅烧。通过总有机碳（TOC）分析研究了它们对刚果红（CR）和甲基橙（MO）降解的光催化活性。通过扫描电子显微镜（SEM）结合能量色散X射线光谱（EDS）研究了所制备复合材料的形成和表征。使用傅里叶变换红外光谱（FTIR）研究了煅烧温度对复合Fe₂O₃/TiO₂光催化剂的影响。通过X射线衍射（XRD）研究了光催化活性和相转变。基于布鲁诺尔-埃米特-特勒（BET）表面积分析研究了不同煅烧温度下光催化剂的比表面积。结果表明，在制备光催化剂的最佳煅烧温度为300°C时，比表面积最大，光催化剂具有最高的光活性。因此，在300°C煅烧的具有最高比表面积（98.73 m²/g）的Fe₂O₃/TiO₂（0.01 w:w Fe:TiO₂）存在下，MO的有机材料降解率达到62.0%，CR的降解率达到46.8%。高温和高浓度的铁促进了TiO₂从锐钛矿向金红石的转变，同时伴随着高结晶度和粒径的增加。发现300°C的最佳煅烧温度下，纺织工业中典型染料的降解率最高。
