Liu Ying, Li Yi-min, Wen Li-hua, Hou Ke-yong, Li Hai-yang
Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2006 Oct;26(10):1939-42.
The iron oxide/bentonite was prepared through a reaction of a solution of OH-Fe salt with bentonite clay dispersion. BET, XRD an d HRTEM were used t o study i ts surface area, microstructure, and average particle size. The iron oxide/bentonite nano composite was developed as the heterogeneous catalyst for successful discoloration and mineralization of dye rhodamine B And the effects of solution pH, H2O2 molar concentration, catalyst loading and initial rhodamine B concentration were studied in detail by photometric method. The process of degradation was traced by UV-Visible spectrum. Besides, the comparison between the heterogeneous photo-Fenton process and homogeneous photo-Fenton process was performed. The result shows that, it has large surface area and mainly consists of high catalytic activity alpha-Fe2O3. The discoloration ratio is up to 97% and the COD(Cr), removal ratio is 71% after 4 h in the presence of pH 3.0, 2.5 x 10(-5) mol x L(-1) rhodamine B 100 mL, 0.3 g x L(-1) catalyst, 10 mmol x L(-1) H2O2 and UV. The rhodamine B degradating speed of heterogeneous photo-Fenton process is much faster than that of homogeneous photo-Fenton process. The catalyst can be reused after being treated.
通过将OH-Fe盐溶液与膨润土粘土分散体反应制备了氧化铁/膨润土。使用BET、XRD和HRTEM来研究其表面积、微观结构和平均粒径。开发了氧化铁/膨润土纳米复合材料作为非均相催化剂，用于成功使罗丹明B脱色和矿化，并通过光度法详细研究了溶液pH值、H2O2摩尔浓度、催化剂负载量和初始罗丹明B浓度的影响。通过紫外-可见光谱追踪降解过程。此外，还进行了非均相光芬顿过程和均相光芬顿过程的比较。结果表明，它具有大的表面积，主要由高催化活性的α-Fe2O3组成。在pH 3.0、2.5×10(-5)mol·L(-1)罗丹明B 100 mL、0.3 g·L(-1)催化剂、10 mmol·L(-1)H2O2和紫外光存在下，4小时后脱色率高达97%，COD(Cr)去除率为71%。非均相光芬顿过程中罗丹明B的降解速度比均相光芬顿过程快得多。催化剂经处理后可重复使用。
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