Simultaneous adsorption of dyes and heavy metals from multicomponent solutions using fly ash
Simultaneous adsorption of dyes and heavy metals from multicomponent solutions using fly ash
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DOI：
10.1016/j.apsusc.2009.12.145
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发表时间：
2010-06
影响因子：
6.7
通讯作者：
M. Vişa;C. Bogatu;A. Duţă
中科院分区：
文献类型：
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作者：
M. Vişa;C. Bogatu;A. Duţă
在染料工业产生的废水中含有大量的染料(非常常见的甲基橙、亚甲基蓝-MB)和重金属(主要来自有机金属染料的镉、铜、镍)。它们倾向于在竞争过程中吸附并修饰底物。高级去除通常是通过吸附提出的，而使用改性飞灰作为基质是一种可持续的解决方案。飞灰的主要成分(二氧化硅、氧化铝、氧化铁和未燃碳)是优先吸附重金属的化合物，也是染料吸附过程中的活性中心。研究了吸附在飞灰表面的亚甲基蓝对复合多元阳离子染料溶液中镉、铜、镍离子物种去除效果的影响。从复杂的多组分体系出发，对吸附效率和吸附动力学进行了评价，并讨论了可能的影响因素。低重金属浓度时可获得高效率(染料工业的实际情况也是如此)，而在中等浓度时，竞争性工艺会降低混合物中铜、镍或镉的单独效率。
In wastewaters originating from dye industry there are amounts of dyes (very common methyl orange, methylene blue—MB) and heavy metals (cadmium, copper, nickel mainly from the organo-metallic dyes). They tend to adsorb in a competitive process and modify the substrate. Advanced removal is usually proposed via adsorption and the use of modified fly ash as a substrate is sustainable solution. The main constituents of fly ash (silica, alumina, iron oxide and un-burned carbon), are the priority compounds which favour the heavy metal adsorption and are active sites in dyes’ adsorption processes. The paper studies the effect of MB adsorbed on the fly ash surface on the removal efficiency of cadmium, copper and nickel ionic species from complex, multi-cationic dye solutions. The adsorption efficiency and kinetics are evaluated from the complex, multicomponent systems and possible influences are discussed. High efficiencies are obtained at low heavy metal concentrations (as it is the real case for the dyes industry) whereas at medium values, competitive processes lower the individual efficiencies of copper, nickel or cadmium from mixtures.