Synthesis of Cu(Ⅱ)-Schiff base complex and its catalytic activity evaluation in aqueous solution
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摘要:
在乙醇溶剂中,3,5-二溴水杨醛为母体,与乙醇胺反应合成了席夫碱,随后与铜离子进一步反应生成铜配合物,用元素分析、紫外光谱、红外光谱和X射线光电子能谱等手段来表征其结构和组成,用液相色谱-高分辨飞行时间-质谱联用仪测定了席夫碱的分子量.以铜配合物为催化剂在水相近中性条件下催化H2O2氧化酚类污染物,以苯酚为底物探讨了溶液pH、H2O2用量、反应温度和反应时间等因素对氧化反应的影响.结果表明,在酚类浓度为1.00mmol/L,铜配合物浓度为0.05mmol/L,H2O2浓度为30mmol/L,pH7.6,50℃,5h等条件下,2,4-二氯酚的去除率最大,达84.8%(矿化率7.8%),五氯酚的去除率最小,为29.1%(无矿化).淬灭实验结果表明羟基自由基是该反应体系中的主要活性氧物质.
A Schiff base was synthesized from the reaction between 3,5-dibromosalicylaldehyde and ethanolamine;then its Cu2+-complex was prepared from the reaction between the Schiff base and copper ion.Their structure and chemical composition were characterized by elemental analysis(EA),ultraviolet spectroscopy(UV),Fourier-transform infrared spectro-scopy(FT-IR),and X-ray photoelectron spectroscopy(XPS).The molecular weight of the Schiff base was confirmed by the high resolution liquid chromatograph-time of flight-mass spectrometry(LC-TOF-MS).Catalytic oxidation of phenols by the Cu2+-complex activated hydrogen peroxide(H2O2)was evaluated at neutral conditions.To optimize the reaction condition,effects of solution pH,H2O2 concentration,reaction temperature,and reaction time were investigated by using phenol as the model contaminant.Under the optimal reaction condition of[Phenols]0=1.00 mmol/L,[Cu2+-complex]0=0.05 mmol/L,[H2O2]0=30 mmol/L,pH 7.6,and 50℃,the removal of PCP was the lowest 29.1%(TOC removal=0),and that of 2.4-DCP was the highest 84.8%(TOC removal=7.8%)within 5 h.Radical quenching experiment results showed that hydroxyl radical(·OH)was the dominant reactive oxygen species(ROS)in the reaction system.
作者:
彭建彪 顾梦瑶 卞伟 贺冰冰 张耀宗 张超男 孙芊芊 刘海津 高士祥
Peng Jianbiao;Gu Mengyao;Bian Wei;He Bingbing;Zhang Yaozong;Zhang Chaonan;Sun Qianqian;Liu Haijin;Gao Shixiang(School of Environment,Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control,Ministry of Education,Henan Key Laboratory for Environmental Pollution Control,Henan Normal University,Xinxiang 453007,China;China Energy Investment Group CO.,LTD.,Beijing 100011,China;School of the Environment,State Key Laboratory of Pollution Control and Resource Reuse,Nanjing University,Nanjing 210023,China)
机构地区:
betway官方app 环境学院 国家能源投资集团有限责任公司 南京大学环境学院
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2021年第1期57-63,共7页
基金:
中国博士后科学基金(2018M632783,2019M660589) betway官方app 博士启动基金(5101219170124) betway官方app 博士后科研经费(5101219470210) betway官方app 青年科学基金(5101219170307) betway官方app 大学生创新训练项目(20190132) 污染控制与资源化研究国家重点实验室开放基金(PCRRF18028).
关键词:
3,5-二溴水杨醛 铜配合物 H2O2 酚类污染物
3,5-dibromosalicylaldehyde Cu2+-complex H2O2 phenols
分类号:
O413 [理学—理论物理]
