Phenol degradation in water through a heterogeneous photo-Fenton process catalyzed by Fe-treated laponite
Phenol degradation in water through a heterogeneous photo-Fenton process catalyzed by Fe-treated laponite
复制标题
DOI：
10.1016/j.watres.2008.12.032
复制
发表时间：
2009-03-01
期刊：
影响因子：
12.8
通讯作者：
Gil, A.
中科院分区：
文献类型：
--
作者：
Iurascu, B.;Siminiceanu, I.;Gil, A.
新的光芬顿催化剂已经从合成的层状粘土锂皂石（laponite RD）制备。合成了两个系列的铁-锂皂石催化剂，在插层过程中对铁聚阳离子-锂皂石混合物进行热处理或不进行热处理。在每个系列中，插层固体在四个温度250、350、450和550 ℃下进行煅烧。将所制备的催化剂用于光助芬顿氧化苯酚的反应，分析了五个操作因素对反应的影响：光源的波长（254 nm UV-C和360 UV-A辐射），催化剂的量（0 - 2 g/L），初始苯酚浓度5 - 1.5 mmol/L）、过氧化氢的初始浓度（20 - 100 mmol/L）和溶液的初始pH（2.5 - 3.5）。在所有实验中，温度保持恒定在30摄氏度。结果表明，在以下操作条件下，仅5分钟后苯酚就可能几乎完全转化：UV-C辐射;水溶液的pH为3;对于含有1 mmol/L苯酚的溶液，1 g（催化剂）/L的剂量和50 mmol/L的过氧化氢浓度。在热处理和350 ℃焙烧条件下制备的催化剂表现出最好的催化性能。建立了该过程的动力学模型，并对模型进行了验证和速率常数的估算。(C)2008爱思唯尔有限公司保留所有权利。
New photo-Fenton catalysts have been prepared from synthetic layered clay laponite (laponite RD). Two series of Fe-laponite catalysts were synthesised, with or without thermal treatment of the mixture Fe polycations-laponite in the intercalation procedure. in each series, the intercalated solids underwent calcination at four temperatures, 250, 350, 450, and 550 degrees C. The catalysts were used for photo-assisted Fenton conversion of phenol, analyzing the influence of five operating factors: the wavelength of the light source (254 nm UV-C and 360 UV-A radiation), the amount of the catalyst (between 0 and 2 g/L), the initial phenol concentration (between 0.5 and 1.5 mmol/L), the initial concentration of hydrogen peroxide (between 20 and 100 mmol/L), and the initial pH of the solution (between 2.5 and 3.5). In all experiments, the temperature was kept constant at 30 degrees C. The results have shown that the almost complete conversion of phenol was possible, after only 5 min, under the following operating conditions: UV-C radiation; a pH of the aqueous solution of 3; a dose of 1 g(catalyst)/L, and a hydrogen peroxide concentration of 50 mmol/L for a solution containing I mmol/L of phenol. The catalyst prepared under thermal treatment and calcined at 350 degrees C showed the best catalytic performance. A kinetic model was proposed for the process, testing its validity and Estimating the rate constants. (C) 2008 Elsevier Ltd. All rights reserved.