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对比研究了3种常见有机酸(草酸、柠檬酸和酒石酸)对多胺树脂吸附镍离子的影响规律,发现在广泛的p H值范围内均表现出促进效应,且促进顺序依次为草酸>柠檬酸>酒石酸,采用Langmuir方程获得的镍离子吸附容量Qm分别为3.37mmol/g、2.50mmol/g和2.32mmol/g,分别较单组份提高了257%、165%和146%。结合液相镍形态分布,推测镍离子与有机酸形成的络合物吸附是主导影响机制,有机酸起到了桥联作用。单组份镍离子溶液动态研究发现,15BV出水即超标(《铜、钴、镍工业污染源排放标准》GB25467-2010),而在草酸、柠檬酸、酒石酸等共存时,吸附穿透点分别延后至210BV、120BV及60BV。
The effects of three common organic acids (oxalic acid, citric acid and tartaric acid) on the adsorption of nickel ions by polyamine resin were studied. The results showed that the promotion effect was observed over a wide range of p H values. The order of promotion was oxalic acid> lemon Acid> tartaric acid. The Qm of nickel ions obtained by Langmuir equation were 3.37mmol / g, 2.50mmol / g and 2.32mmol / g, respectively, which were 257%, 165% and 146% higher than that of the single component. Combining with the distribution of liquid phase nickel, it is speculated that the adsorption of complex formed by nickel ions and organic acids is the dominant mechanism, and organic acids play a bridging role. Dynamic study of single-component nickel ion solution found that 15BV effluent was excessive (“GB25467-2010” for industrial sources of copper, cobalt and nickel), whereas in the co-existence of oxalic acid, citric acid and tartaric acid, the breakthrough point of adsorption was delayed To 210BV, 120BV and 60BV.