摘要
采用电流调控方式制备多催化位点的高效Ti/PbO_(2)阳极,并对其形貌、晶型、电化学性能等进行表征,以常见抗生素阿莫西林(AMX)作为目标有机物,考察了阿莫西林在电催化降解中的毒性演变过程.结果表明,随沉积电流密度梯级升高,电极表层形貌由“四棱锥型”向“菜花状”转变,但晶相仍为β-PbO_(2),同时电极伏安电荷量提高,膜阻抗降低.毒性检测结果表明,水体中AMX浓度与斜生栅藻的藻密度呈负相关,但对其叶绿素合成表现为“低浓度促进,高浓度抑制”效果.此外,优选制备电极对AMX具有较好的降解效果,AMX水体毒性水平随电催化降解呈现先升高后降低趋势,转录效应指数TELI_(total)值由最初1.54升至2.61,并经150min的持续电催化降为1.63.经110种基因应激结果表明,AMX在电催化降解中造成的细胞氧化应激与蛋白质应激最为明显.
A highly efficient Ti/PbO_(2) anode with multi catalytic sites was prepared by current regulation,and its morphology,crystalline and electrochemical performance were characterized.Amoxicillin(AMX),a common antibiotic,was used as the target organic compound to investigate its toxicity evolution during the electrocatalytic degradation.Results showed that the surface morphology of electrode surface changed from"pyramid"to"cauliflower"with the increase of deposition current density,but the crystal phase was kept β-PbO_(2).Meanwhile,the voltammetric capacity increased and the membrane impedance decreased for prepared anode.Toxicity test showed that AMX concentration in water was negatively correlated with the algae density of Scenedesmus obliquus,but it exhibited a"low concentration promotion,high concentration inhibition"effect on the chlorophyll synthesis.In addition,the optimized electrode exhibited a good degradation effect on AMX and the toxicity level of AMX increased first and then decreased during electrocatalytic degradation.The TELI_(total) value increased from 1.54 to 2.61,and then decreased to 1.63 after 150 minutes.The results of 110 kinds of gene stress showed that AMX had a significant effect on the oxidative stress and protein stress during electrocatalytic degradation.
作者
李晓良
王雪
邱晓鹏
路思佳
辛凤丹
郑兴
LI Xiao-liang;WANG Xue;QIU Xiao-peng;LU Si-jia;XIN Feng-dan;ZHENG Xing(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;Department of Environmental Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第2期727-734,共8页
China Environmental Science
基金
陕西省自然科学基金资助项目(2019JQ-735)
陕西省教育厅重点实验室科研计划项目(19JS049)
中国博士后科学基金资助项目(2020M683688XB)。
