| 以海泡石为载体的双金属多相类芬顿催化剂的制备及表征 |
| 摘要点击 3446 全文点击 1740 投稿时间：2012-12-03 修订日期：2013-01-27 |
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| 中文关键词 改性海泡石 多相类芬顿 活性艳蓝 均匀沉淀法 响应曲面 |
| 英文关键词 modified sepiolite heterogeneous Fenton-like reactive brilliant blue homogeneous precipitation method response surface methodology |
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| 中文摘要 |
| 以活性艳蓝为目标污染物,以改性海泡石为载体,以Fe(NO3)3浓度、MnSO4浓度、尿素浓度、水浴温度、煅烧温度与煅烧时间为影响因素,优化了均匀沉淀法制备双金属多相类芬顿催化剂的工艺条件,并利用SEM、XRD、FTIR对催化剂进行了表征. 结果表明,随铁离子浓度的增大,所制得催化剂金属离子活性越高. 少量的锰掺杂可抑制Fe2O3粒径的增长,提高催化剂的活性. 尿素浓度增大,使得晶粒的生成速率愈快,有利于生成细小、均匀的金属颗粒. 利用Box-Behnken实验得出催化剂制备的最佳工艺条件为:硝酸铁浓度为0.18 mol ·L-1,硫酸锰浓度为0.05 mol ·L-1,尿素的浓度为1.0 mol ·L-1,海泡石的投加量为40 g ·L-1,水浴温度为100℃,煅烧温度为370℃,煅烧时间为3 h. SEM表明本实验所采用的海泡石为α型海泡石,可作为良好的催化剂载体; 在催化剂制得后,FTIR图谱显示海泡石的纯度得到提高,并出现了Fe-O的吸收峰. XRD图谱表明,在催化剂表面铁离子主要以α-Fe2O3和γ-Fe2O3的形式存在. |
| 英文摘要 |
| The reactive brilliant blue was chosen as the probe pollutant. Fe(NO3)3 concentration, MnSO4 concentration, urea concentration, water bath temperature, calcined temperature and time were as influencing factors, the process parameters of homogeneous precipitation method was optimized for the preparation of bimetallic heterogeneous Fenton-like catalyst as modified sepiolite supported. At the same time, surface chemical characteristics of catalyst were analyzed by SEM, FTIR and XRD. Results showed that: with increasing iron ion concentrations, the active ingredient of the catalyst increased. Adding small amount of manganese ion could inhibit the growth of Fe2O3 diameter and increase the activity of the catalyst. Urea concentration was increased, so that the higher the urea concentration, the higher rate of formation of crystal gains, was conducive to generate small and uniform particles. The optimal conditions were found for preparing bimetallic heterogeneous Fenton-like catalyst by Box-Behnken experiment, which were as follows: concentration of Fe(NO3)3, MnSO4 and urea were 0.18 mol ·L-1, 0.05 mol ·L-1 and 1.0 mol ·L-1, respectively. The dosage of the modified sepiolite was 40 g ·L-1 and water bath temperature was 100℃. Additionally, the catalyst was calcined at 370℃ for 3 h. The SEM showed that the sepiolite was an α-type sepiolite, which could be used as a well catalyst support. The infrared spectrum presented the bend vibrations of the Fe-O stretch vibration. The XRD patterns of the catalysts showed the characteristic diffraction peaks of α-Fe2O3 and γ-Fe2O3. |
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