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首页> 外文期刊>RSC Advances >Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters
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Highly efficient removal of Cu(ii) by novel dendritic polyamine–pyridine-grafted chitosan beads from complicated salty and acidic wastewaters

机译：通过新的树突式多胺 - 吡啶 - 吡啶接枝壳聚糖珠粒高效除去Cu（II）来自复杂的咸和酸性废水的壳聚糖珠粒

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In this study, dendritic polyamine chitosan beads with and without 2-aminomethyl pyridine were facilely prepared and characterized. Compared to CN (without the pyridine function), more adsorption active sites, larger pores, higher nitrogen content, higher specific surface area, and higher strength could be obtained for CNP (with the pyridine function). CNP microspheres afforded a larger adsorption capacity than those obtained by CN for different pH values; further, the uptake amounts of Cu( II ) were 0.84 and 1.12 mmol g ~(?1) for CN and CNP beads, respectively, at pH 5. The CNP microspheres could scavenge Cu( II ) from highly acidic and salty solutions: the maximum simulated uptake amount of 1.93 mmol g ~(?1) at pH 5 could be achieved. Due to the strong bonding ability and weakly basic property of pyridine groups, the adsorption capacity of Cu( II ) at pH 1 was 0.75 mmol g ~(?1) in highly salty solutions, which was comparative to those obtained from the commercial pyridine chelating resin M4195 ( Q _(Cu(II)) = 0.78 mmol g ~(?1) at pH 1). In addition, a distinct salt-promotion effect could be observed for CNP beads at both pH 5 and 1. Therefore, the prepared adsorbent CNP beads can have promising potential applications in the selective capturing of heavy metals in complex solutions with higher concentrations of H ~(+) and inorganic salts, such as wastewaters from electroplating liquid and battery industries.
机译：在该研究中，有没有2-氨基甲基吡啶的树突式多胺壳聚糖珠粒被施加并表征。与CN（没有吡啶函数）相比，可以获得更多吸附活性位点，更大的孔隙，更高的氮含量，更高的比表面积和更高的强度，可以获得CNP（用吡啶函数）。 CNP微球的吸附容量比CN为不同的pH值获得的吸附容量较大;此外，Cu（II）的摄取量分别为CN和1.12mmol G〜（α1），用于CN和CNP珠粒，在pH5中。CNP微球可以从高度酸性和咸溶液中清除Cu（II）：可以实现在pH5的最大模拟摄取量为1.93mmol g〜（α1）。由于吡啶基团的强粘合能力和弱碱性，pH 1在高咸溶液中的Cu（II）的吸附容量为0.75mmol g〜（α1），其对来自商业吡啶螯合剂获得的那些树脂M4195（Q _（II））pH 1的0.78mmol g〜（α1））。此外，可以观察到在pH 5和1中的CNP珠粒的不同盐促进效果。因此，制备的吸附剂CNP珠子可以具有很有希望的潜在应用，该应用在具有较高浓度的H〜浓度的H〜H〜H〜H〜 （+）和无机盐，如从电镀液和电池行业的废水器。

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