Combined photolysis and catalytic ozonation of dimethyl phthalate in a high-gravity rotating packed bed.
Combined photolysis and catalytic ozonation of dimethyl phthalate in a high-gravity rotating packed bed.
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DOI：
10.1016/j.jhazmat.2008.03.085
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发表时间：
2009-01
影响因子：
13.6
通讯作者：
Chia-Chi Chang;C. Chiu;Ching-Yuan Chang;Chiung-Fen Chang;Yi-Hung Chen;Dar-Ren Ji;Yuehwa Yu;P. Chiang
中科院分区：
文献类型：
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作者：
Chia-Chi Chang;C. Chiu;Ching-Yuan Chang;Chiung-Fen Chang;Yi-Hung Chen;Dar-Ren Ji;Yuehwa Yu;P. Chiang
采用超重力旋转填料床（HGRPB）作为催化臭氧化反应器，对常见的内分泌干扰物邻苯二甲酸二甲酯（DPB）进行了降解研究。HGRPB是一种有效的气液混合设备，可以提高臭氧的传质系数。将Dash 220 N的含铂催化剂（Pt/-Al 2 O3）与紫外灯（UV）组合在超重力臭氧化（HG-OZ）系统中，以增强液体中分子臭氧的自分解，形成高活性自由基物种。测试了HG-OZ与Dash 220 N和UV的不同组合对降解三氯甲烷的作用。这些包括HG-OZ、HG催化OZ（HG-Pt-OZ）、HG光解OZ（HG-UV-OZ）和HG-UV-Pt-OZ。结果表明，在每体积液体样品的臭氧投加量为1.2gL-1时，上述四种臭氧氧化过程均导致显著的有机物分解和总有机碳（TOC）矿化。UV和Pt/γ-Al_2O_3复合作用使HG-OZ的TOC矿化效率（ηTOC）分别提高到56%（HG-UV-OZ）和57%（HG-Pt-OZ），而单独使用臭氧时仅提高了45%。HG-UV-Pt-OZ工艺的η TOC最高，约为68%。
In this study, a high-gravity rotating packed bed (HGRPB) was used as a catalytic ozonation reactor to decompose dimethyl phthalate (DMP), an endocrine disrupting chemical commonly encountered. The HGRPB is an effective gas–liquid mixing equipment which can enhance the ozone mass transfer coefficient. Platinum-containing catalyst (Pt/-Al2O3) of Dash 220N and ultra violet (UV) lamp were combined in the high-gravity ozonation (HG-OZ) system to enhance the self-decomposition of molecular ozone in liquid to form highly reactive radical species. Different combinations of HG-OZ with Dash 220N and UV for the degradation of DMP were tested. These include HG-OZ, HG catalytic OZ (HG-Pt-OZ), HG photolysis OZ (HG-UV-OZ) and HG-UV-Pt-OZ. The result indicated that all the above four ozonation processes result in significant decomposition of DMP and mineralization of total organic carbon (TOC) at the applied ozone dosage per volume of liquid sample of 1.2gL−1. The UV and Pt/γ-Al2O3combined in HG-OZ can enhance the TOC mineralization efficiency (ηTOC) to 56% (via HG-UV-OZ) and 57% (via HG-Pt-OZ), respectively, while only 45% with ozone only. The process of HG-UV-Pt-OZ offers the highest ηTOCof about 68%.