| Ag2O-Bi2MoO6:制备及光催化降解富里酸 |
| Ag2O Doped Bi2MoO6: Preparation and Photocatalytic Activity for Fulvic Acid Degradation |
|
| 摘要: 以钼酸铵、硝酸铋和硝酸银为原料,以十六烷基三甲基溴化铵(CTAB)为辅助活性剂,采用水热法合成了Ag2O-Bi2MoO6光催化剂。用X射线粉末衍射、扫描电镜及紫外-可见吸收光谱等进行表征,并对水中天然有机物富里酸进行了光催化氧化研究。结果表明:未掺杂钼酸铋表面平滑,Ag2O-Bi2MoO6表面有明显的小块颗粒存在,分布集中,且其XRD图出现Ag2O的衍射峰。与未掺杂样品相比,掺杂Ag2O后Bi2MoO6的可见光催化活性提高,当掺银量为1.5%时活性最高。实验最佳催化剂浓度为0.6g·L-1,在溶液pH值减小、富里酸初始浓度减小时有助于富里酸的去除。富里酸降解过程符合一级反应动力学方程,拟合方程为y=-0.0195x。对富里酸降解产物进行发光菌生物毒性测试,发现光催化2h后降解产物比处理前毒性降低约90%。 |
| 关键词: 钼酸铋 富里酸 掺杂 光催化氧化 动力学 毒性测试 |
| 基金项目: 国家自然科学基金(No.U1362202)、山东省自然科学基金(No.ZR2011BQ014)、中央高校基本科研业务费专项资金(No.12CX04093A)资助项目。 |
| Abstract: We use ammonium molybdate, bismuth nitrate and silver nitrate as raw materials, hexadecyl trimethyl ammonium bromide(CTAB) as auxiliary surfactant to synthesize photocatalyst Ag2O-Bi2MoO6 via hydrothermal method. The photocatalyst was characterized by XRD, SEM and UV-Vis spectroscopy. The photocatalytic oxidation of fulvic acid in water was performed over the catalyst. The results show that the surface of pure bismuth molybdate is smooth while on the surface of Ag2O-Bi2MoO6 there are some well-distributed small grains. The XRD pattern of Ag2O-Bi2MoO6 shows diffraction peaks of Ag2O. Compared with the pure sample, Ag2O-Bi2MoO6 has much higher photocatalytic activity under visible light, and when its doping level is 1.5%, it shows the highest activity. The best catalyst concentration is 0.6 g·L-1. The decrease in pH value of the solvent and initial concentration of fulvic acid will promote the removal of fulvic acid. The degradation process of fulvic acid conforms the first order kinetics, and the fitting equation is y=-0.0195x. A Photobacterium phosphoreum toxicity test results show that the toxicity of the 2 h photocatalytic degradation product is reduced by about 90% compared to the un-degraded fulvic acid. |
| Keywords: bismuth molybdate fulvic acid doping photocatalytic oxidation kinetic toxicity test |
| 投稿时间：2014-12-05 修订日期：2015-02-15 |
| 摘要点击次数: 1713 |
| 全文下载次数: 1895 |
| 张月,赵雪姣,段元首,苏秀荣.Ag2O-Bi2MoO6:制备及光催化降解富里酸[J].无机化学学报,2015,31(5):939-946. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
