N,N-二乙基-N’-氟取代苯甲酰基硫脲应用于镍废水处理研究
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摘要
利用N,N-二乙基-N’-氟取代苯甲酰基硫脲的强配位性研究了其对废水中镍离子的处理作用,并利用火焰原子吸收法对残留镍离子含量进行测定。结果表明,含Ni(II)500 mg/L的模拟废水,在絮凝剂聚合氯化铝与聚丙烯酰胺存在下,酰基硫脲可在pH 7～8范围内将Ni(II)离子沉淀,且残留镍含量远低于国家排放标准。本方法的优点在于:在接近中性的条件下可将镍离子沉淀完全,处理后的废液可不经调节pH直接排放,沉淀下来的酰基硫脲与Ni(II)离子络合物残渣经过酸处理,可重新释放出镍离子和硫脲沉淀,沉淀剂的回收率达72.1%,降低废水处理成本。
This test based on strong coordination capacity of N,N-diethyl-N'-fluorobenzoylthioureas to study its effect on treating nickel ion in waste water,upon addition of polyaluminium chloride and polyacrylamide flocculant acyl thiourea was used to treat waste water containing Ni(II) 500 mg/L within the scope of pH in 7～8.Then the concentration of residual Ni~(2+) in treated water was determinated by the flame atomic absorption,the result showed that was far lower than the national discharge standard of Ni~(2+).The advantage of this method:first nickel ion can be fully precipitated under the condition close to neutral and without adjusting the pH of solution;second,when adding acid to the complex precipitation of acyl thiourea and Ni ion,the precipitation would be decomposed into nickel ion and the acyl thiourea precipitate instead.So it was easy to recycle nickel ion of waste water and the recovery rate of acyl thiourea was 72.1%,it would dramatically lower costs of waste water treatment.
This test based on strong coordination capacity of N,N-diethyl-N'-fluorobenzoylthioureas to study its effect on treating nickel ion in waste water,upon addition of polyaluminium chloride and polyacrylamide flocculant acyl thiourea was used to treat waste water containing Ni(II) 500 mg/L within the scope of pH in 7～8.Then the concentration of residual Ni~(2+) in treated water was determinated by the flame atomic absorption,the result showed that was far lower than the national discharge standard of Ni~(2+).The advantage of this method:first nickel ion can be fully precipitated under the condition close to neutral and without adjusting the pH of solution;second,when adding acid to the complex precipitation of acyl thiourea and Ni ion,the precipitation would be decomposed into nickel ion and the acyl thiourea precipitate instead.So it was easy to recycle nickel ion of waste water and the recovery rate of acyl thiourea was 72.1%,it would dramatically lower costs of waste water treatment.
引文
[1] 任志宏.重金属废水中含镍废水的处理[J].应用技术,2007,14(5):8-13.
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[9] Zhang Youming,Pang Haixia,Cao Cheng.Synthesis,crystal structure and biological activity of a new complex bis(1,1-diethyl-3-(3-fluorobenzoyl)-thiourea)nickel(II)[J].Indian J Chem,2007,46A:1787-1791.
[2] 王绍文,姜凤有.重金属废水治理技术[M].北京:冶金工业出版社,1993.
[3] 周利民,金解云,王一平,等.Cd2+和Ni2+在粉煤灰上的吸附特性[J].燃料化学学报,2008,36(5):557-562.
[4] 冯敏.工业水处理技术[M].北京:海洋出版社,1992.
[5] 王燕.物化法处理镍钴电池废水的试验研究[D].长沙:湖南大学,2010.
[6] 孙颖.离子交换技术在重金属废水处理中的应用[J].环境科学与管理,2008(10):23-24.
[7] 刘华.离子交换法处理电镀废水[M].北京:轻工业出版社,1987.
[8] 柳建设,舒余德,陈白珍.镍冶金废水处理工艺研究[J].上海环境科学,1998,17(l):26-28.
[9] Zhang Youming,Pang Haixia,Cao Cheng.Synthesis,crystal structure and biological activity of a new complex bis(1,1-diethyl-3-(3-fluorobenzoyl)-thiourea)nickel(II)[J].Indian J Chem,2007,46A:1787-1791.