4-Chlorophenol Oxidation Photocatalyzed by a Calcined Mg鈥揂l鈥揨n Layered Double Hydroxide in a Co-current Downflow Bubble Column
详细信息 查看全文
- 作者：Eduardo Mart铆n del Campo ; Jaime Sanchez Valente ; Thelma Pav贸n ; Rub铆 Romero ; 脕ngeles Mantilla ; Reyna Natividad
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2011
- 出版时间：October 19, 2011
- 年：2011
- 卷：50
- 期：20
- 页码：11544-11552
- 全文大小：986K
- 年卷期：v.50,no.20(October 19, 2011)
- ISSN：1520-5045
文摘
The objective of this work is to study, for the first time, the photodegradation of 4-chlorophenol (4CP) catalyzed by a calcined Mg鈥揨n鈥揂l layered double hydroxides (MgAlZn LDHs) in a co-current downflow bubble column (CDBC) photoreactor at pilot scale. The effect of initial organic compound concentration (C4CP0), temperature (T), and mass catalyst over reaction rate (鈭?i>r4CP) was elucidated. An intrinsic kinetic regime was established, and a single-site Langmuir鈥揌inshelwood mechanism was determined to occur during the organic compound oxidation. The catalyst was characterized by X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), and ultraviolet鈥搗isible light (UV/vis) spectrophotometry. The reaction progress was verified by UV/vis spectrophotometry and total organic carbon (TOC) content. Degradation and mineralization rate were found to be dependent on T and 4CP concentration. In the range of studied operating conditions, a maximum of 94% 4CP was degraded, while 70% total organic carbon removal was achieved.