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Degradation of Azo dye direct black BN based on adsorption and microwave-induced catalytic reaction

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Frontiers of Environmental Science & Engineering 2018年第1期12卷 71-83页

作者： Shanshan Ding Wen Huang Shaogui Yang danjun mao Julong Yuan Yuxuan Dai Jijie Kong Cheng Sun Huan He Shiyin Li Limin Zhang . State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210023 China.. School of Environment Nanjing Normal University Nanjing 210023 China

The novel microwave catalyst MgFe204-SiC was synthesized via sol-gel method, to remove azo dye Direct Black BN （DB BN） through adsorption and microwave-induced catalytic reaction. Microwave- induced catalytic degradation of DB BN, including adsorption behavior and its influencing Factors of DB BN on MgFc204-SiC were investigated. According to the obtained results, il indicated thai the pseudo-second-order kinetics model was suitable fbr the adsorption of DB BN onto MgFc204-SiC. Besides, the consequence of adsorption isotherm depicted that the adsorption of DB BN was in accordance with the Langmuir isotherm, which verified that the singer layer adsorption of MgF%O4- SiC was dominant than the multi-layer one. The excellent adsorption capacities of MgFe204-SiC were kept in the range of initial pH from 3 to 7. In addition, it could be concluded that the degradation rate of DB BN decreased over ten percent after the adsorption equilibrium had been attained, and thc results from the result of comparative experiments manitbsted that the adsorption process was not conducive to the process of microwave-induced catalytic degradation. The degradation intermediates and products of DB BN were identified and determined by GC-MS and LC-MS. Furthermore, combined with the catalytic mechanism of MgFe204-SiC, the proposed degradation pathways of DB BN were the involution of microwave-induced OH and holes in this catalytic system the breakage of azo bond, hydroxyl substitution, hydroxyl addition, nitration reaction, dcamination reaction, dcsorbate reaction, dehydroxy group and ring-opening reaction.

关键词： AdsorptionMicrowave-induced catalytic degradationDirect black BNDegradation pathway

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负载型黑磷量子点光催化降解水中磺胺甲恶唑

环境化学 2022年第7期41卷 2162-2169页

作者：姜婷婷周至城茅丹俊付翯云南京大学环境学院污染控制与资源化研究国家重点实验室南京210093

本论文以二氧化钛(TiO_(2))为载体,通过超声辅助沉淀沉积法制备了黑磷量子点(BPQDs)负载型催化剂BP@TiO_(2),采用X射线衍射、透射电镜、紫外可见漫反射等对其进行了表征,考察了BP@TiO_(2)催化剂在模拟太阳光下降解磺胺甲恶唑(SMX)的光... 详细信息

本论文以二氧化钛(TiO_(2))为载体,通过超声辅助沉淀沉积法制备了黑磷量子点(BPQDs)负载型催化剂BP@TiO_(2),采用X射线衍射、透射电镜、紫外可见漫反射等对其进行了表征,考察了BP@TiO_(2)催化剂在模拟太阳光下降解磺胺甲恶唑(SMX)的光催化活性.结果表明,BPQDs的负载提高了催化剂的光电子迁移能力,降低了光生电子-空穴对的复合率,使得BP@TiO_(2)的光催化性能相对于载体TiO_(2)有所提高.其中,BPQDs载荷量为0.049%wt.的催化剂活性最高,光催化降解SMX的初活性是TiO_(2)的4倍.循环光解实验表明,BP@TiO_(2)在4次循环实验后仍保持较高的光催化活性,证明了它有较好的耐光腐蚀性和光催化稳定性.

关键词：黑磷量子点二氧化钛磺胺类抗生素光催化催化稳定性

±500kV伊敏换流站移动式隔声屏障结构设计

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电力建设 2013年第6期34卷 41-45页

作者：唐剑潇杨国富刘辉毛丹君东北电力设计院长春市130021

针对±500 kV伊敏换流站的技术特点,提出移动式隔声屏障结构的设计理念。研究了移动式隔声屏障的设计原则和设计方案,并介绍了其结构形式和构造要点。该移动式隔声屏障方案对后续高压直流换流站换流变压器及平波电抗器隔声屏障结构的设... 详细信息

针对±500 kV伊敏换流站的技术特点,提出移动式隔声屏障结构的设计理念。研究了移动式隔声屏障的设计原则和设计方案,并介绍了其结构形式和构造要点。该移动式隔声屏障方案对后续高压直流换流站换流变压器及平波电抗器隔声屏障结构的设计具有一定借鉴意义。

关键词：移动式隔声屏障换流变平抗结构设计

中国典型河湖水体铅的水生生物安全基准与生态风险评价

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生态毒理学报 2017年第3期12卷 434-445页

作者：王菲廖静茅丹俊孙成杨绍贵周俊丽刘红玲高士祥李梅南京大学环境学院南京210023 南京泓泰环境检测有限公司南京210023 中国环境科学研究院北京100012

采用物种敏感度排序法(SSR)对我国铅的淡水水生生物安全基准进行推导,并以太湖为例进行了流域水生生物安全基准推导。对于难以获得的本土生物毒性数据,开展了相应的毒性试验。获得了我国国家与太湖流域铅的水生生物安全基准值,基准最大... 详细信息

采用物种敏感度排序法(SSR)对我国铅的淡水水生生物安全基准进行推导,并以太湖为例进行了流域水生生物安全基准推导。对于难以获得的本土生物毒性数据,开展了相应的毒性试验。获得了我国国家与太湖流域铅的水生生物安全基准值,基准最大浓度(CMC)分别为63.92、104.26μg·L-1,基准连续浓度(CCC)分别为1.21、4.06μg·L-1。同时,对我国主要河流以及太湖流域进行了铅的生态风险评价,联合概率曲线法显示影响5%水生生物种类的概率分别为66.22%和43.19%,熵值法则显示中国主要河流存在较大的铅暴露风险,因此,我国铅的潜在生态风险较大,主要河流与太湖流域存在铅污染问题。

关键词：铅水质基准物种敏感度排序法生态风险评价熵值法概率风险评价法