通过简单的离子交换方法成功合成了铁钛双金属共柱撑膨润土催化剂,并利用N_2吸附、X射线衍射和等离子体发射光谱对所合成的样品进行了表征.以苯酚为目标污染物,考察了pH值、催化剂的投加量以及双氧水的加入量等对苯酚降解性能的影响.结果表明,在中性条件和紫外光照射下,铁钛双金属柱撑膨润土上苯酚降解率和矿化率都高达95%,且铁离子的溶出率始终低于2mg/L,均优于单一铁柱撑膨润土催化剂.经过五次循环测试,催化剂均表现出较高的活性.即使在碱性(pH=9.0)条件下,反应180min苯酚降解率也高达70.3%,表现出较好的酸碱适应性.并讨论了双金属柱撑土所具有较人的比表面积和较强的表面酸性与活性之间的关系.
Fe-Ti pillared bentonite (Fe-Ti-B) was successfully prepared through a simple cation exchange reaction. The obtained sample was characterized by N_2 adsorption-desorption, X-ray powder diffraction, and inductively coupled plasma-atomic emission spectrometry. The effects of initial Ph, catalyst amount, and H_2O_2 concentration on photocatalysis-Fenton degradation of phenol were investigated in detail.The results showed that the conversion and mineralization rates of phenol were over 95% at pH = 6.6 under UV light irradiation. At the same time, the iron leaching rate was kept below 2 mg/L during the degradation process. The performance of the Fe-Ti-B catalyst is superior to Fe-pillared bentonite. Moreover, it still kept a high activity after 5 times run, indicating that Fe-Ti-B is a highly stable catalyst. The degradation rate of phenol could even reach 70.3% after 180 min under alkaline conditions (pH = 9.0). The excellent performance of Fe-Ti-B may be attributed to its large surface area and strong surface acidity.
参考文献
| [1] | 陈正雄,祝万鹏,杨少霞,王建兵.催化湿式氧化苯酚的TiO2-CeO2催化剂的制备与表征[J].催化学报,2006(12):1073-1079. |
| [2] | 苑宝玲,CHEN Yiping,陈一萍,李艳波,刘会娟,曲久辉.Fenton催化氧化降解藻毒素MCLR的效能研究[J].环境科学学报,2005(07):925-929. |
| [3] | Feng J Y;Hu X J;Yue P L;Zhu H Y Lu G Q .[J].Water Research,2003,37:3776. |
| [4] | Cheng M M;Ma W H;Li J;Huang Y P Zhao J C Wen Y X Xu Y M .[J].Environmental Science and Technology,2004,38:1569. |
| [5] | Gumy D;Fernandez-Ibanez P;Malato S;Pulgarin C Enea O Kiwi J .[J].Catalysis Today,2005,101:375. |
| [6] | Parra S;Guasaquillo I;Enea O;Mielczarski E Mielczarki J Albers P Kiwi-Minsker L Kiwi J .[J].Journal of Physical Chemistry B,2003,107:7026. |
| [7] | Feng J Y;Hu X J;Yue P L .[J].Environmental Science and Technology,2004,38:269. |
| [8] | Feng J Y;Hu X J;Yue P L .[J].Environmental Science and Technology,2004,38:5773. |
| [9] | Noorjahan M;Kumari V D;Subrahmanyam M;Panda L .[J].Applied Catalysis B:Environmental,2005,57:291. |
| [10] | 温丽华,李益民,刘颖,李海洋.含铁的柱撑膨润土光催化降解甲基橙[J].化学学报,2005(01):55-59. |
| [11] | Chen J X;Zhu L Z .[J].Catalysis Today,2007,126:463. |
| [12] | Chen J X;Zhu L Z .[J].Chemosphere,2006,65:1249. |
| [13] | Fu XZ.;Yang Q.;Anderson MA.;Zeltner WA. .CATALYTIC HYDROLYSIS OF DICHLORODIFLUOROMETHANE (CFC-12) ON SOL-GEL-DERIVED TITANIA UNMODIFIED AND MODIFIED WITH H2SO4[J].Journal of Catalysis,1997(2):482-490. |
| [14] | 闫琰,叶芝祥,闫军,黄登盛.紫外光谱法同时测定水中苯酚、邻苯二酚和间苯二酚[J].化学分析计量,2008(02):22-24. |
| [15] | Catrineseu C;Teodosiu C;Macoveanu M;Miehe-Brendle J Dred R L .[J].Water Research,2003,37:1154. |
| [16] | 赵东源;杨亚书;郭燮贤;王国甲 .[J].物理化学学报,1993,9:193. |
| [17] | 赵东源;杨亚书;辛勤;张慧,郭燮贤 .[J].催化学报,1993,14:287. |
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