Oxytetracycline degradation and toxicity evolution by catalytic oxidation process over sludge derived carbon
Oxytetracycline degradation and toxicity evolution by catalytic oxidation process over sludge derived carbon
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DOI：
10.1016/j.jece.2019.102889
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发表时间：
2019-02
影响因子：
7.7
通讯作者：
Xiyang Liu;Fei Huang;Yide He;Yang Yu;Yong Lv;Yanhua Xu;Yongjun Zhang
中科院分区：
文献类型：
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作者：
Xiyang Liu;Fei Huang;Yide He;Yang Yu;Yong Lv;Yanhua Xu;Yongjun Zhang
本文研究了污泥衍生碳（SC）对水溶液中土霉素（OTC）的降解行为。通过BET和热重分析对不同酸处理的SC进行了表征。结果表明，SC-H2SO4比SC-HCl和SC表现出更高的催化活性。 60℃催化氧化处理后OTC和总有机碳(TOC)的最大去除率分别为92.6%和70.2%。高级氧化过程（AOP）后抗生素的安全性由于可能增加毒性而备受关注。通过 GC-MS 鉴定了七种中间产物，并提出了四种途径。此外，首次通过斑马鱼胚胎研究了OTC降解的毒性。与正常营养液（TE1）相比，OTC溶液（TE2）孵育的斑马鱼出现血凝、心包水肿，并且心跳、体长和游动频率发生显着变化。而且，所有斑马鱼胚胎在处理过的OTC溶液(TE3)中均出现凝结现象并且未孵化。相比之下，用调节至中性pH值的处理过的OTC溶液(TE4)培养的斑马鱼可以孵化而没有异常。结果表明，催化氧化处理后的OTC溶液应调节pH至中性，以减少对生态的毒性。
The degradation behavior of oxytetracycline (OTC) in aqueous solution using sludge derived carbon (SC) was investigated in this paper. SC treated with different kinds of acids were characterized by BET and thermogravimetric analysis. The results showed that SC-H2SO4exhibited higher catalytic activity than SC-HCl and SC. The maximum removal of OTC and total organic carbon (TOC) after catalytic oxidation process at 60 °C was 92.6% and 70.2%, respectively. The safety of antibiotics after advanced oxidation processes (AOPs) has attracted much attention due to the possibility of toxicity increasing. Seven intermediate products were identified by GC–MS and four pathways were proposed. Furthermore, the toxicity of OTC degradation was investigated by zebrafish embryos for the first time. Zebrafish incubated with OTC solution (TE2) had haemagglutination, pericardial edema and showed significant changes in heartbeat, body length, and roaming frequency compared with the normal nutrient solution (TE1). Moreover, all zebrafish embryos had condensation phenomenon and did not hatch out in the treated OTC solution (TE3). In contrast, the zebrafish could hatch out without abnormality cultured with the treated OTC solution adjusted to the neutral pH (TE4). Results indicated that the treated OTC solution after catalytic oxidation process should be adjusted to the neutral pH to reduce the toxicity to the ecology.