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A novel magnetically separable composite photocatalyst:Titania-coated magnetic activated carbon

机译：新型磁可分离复合光催化剂：二氧化钛包覆的磁性活性炭

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摘要

A novel magnetically separable composite photocatalyst,titania-coated gamma-Fe2O3 magnetic activated carbon,was prepared by depositing of anatase titania onto the surface of magnetic activated carbon(MAC)which was prepared by a simple route:directly adsorbing of magnetic gamma-Fe2O3 nanoparticles onto activated carbon(AC).The prepared samples were characterized by XRD,SEM,BET and vibrating sample magnetometer(VSM).The photocatalytic activity of the samples was determined by degradation of model contaminant water of phenol aqueous solution,and compared to Degussa P25.The effect of gamma-Fe2O3/AC mass ratio on the photocatalytic activity was also studied.Results illustrated that photocatalyst with gamma-Fe2O3/AC mass ratio of 1:7 showed the highest degradation rate,which was nearly twice to that of P25.The photocatalyst can be separated easily by an external magnetic field.It can also be re-dispersed into aqueous solution by stirring after the removing of external magnetic field.The photocatalyst can be recycled with a little decreasing of photocatalytic activity,and the degradation rate of phenol was still higher than 80% after six cycles.
机译：通过将锐钛矿型二氧化钛沉积在磁性活性炭（MAC）的表面上，制备了一种新型的可磁分离复合光催化剂，二氧化钛包覆的γ-Fe2O3磁性活性炭，其制备方法为：直接吸附磁性γ-Fe2O3纳米粒子用XRD，SEM，BET和振动磁强计（VSM）对制备的样品进行表征。通过降解苯酚水溶液中模型污染物水来测定样品的光催化活性，并与Degussa P25进行比较。研究了γ-Fe2O3/ AC质量比对光催化活性的影响。结果表明，γ-Fe2O3/ AC质量比为1：7的光催化剂降解率最高，几乎是P25的两倍。光催化剂可以很容易地被外部磁场分离，也可以在去除外部磁场后通过搅拌使其重新分散在水溶液中。催化剂可以循环使用，光催化活性略有下降，经过六个循环后苯酚的降解率仍高于80％。

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