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3.3. Morphological analyses Fig. 3 shows the SEM images of the resin incubated in different liquid media. The SEM images of the dry resin surface and the cross section are shown in Fig. 3(a) and (b). From Fig. 3(b), the resin produced through graft copolymerization of _-CD with AA and AM had a clear, stratified rock structure with a large number of pores (Fig. 3(b)), which increased the adsorption surface area and improved the exchange and adsorption processes. The SEM images of the resin in distilled water and in NaCl, CaCl2, and AlCl3 solutions are shown in Fig. 3(c)–(f), respectively. After absorption, the internal structure of the resin assumes an obvious three-dimensional polygon network on the inside, while the network size decreased with increasing valence state of the metal ions. The three-dimensional network structure of the resin in Ca2+ and Al3+ solutions was damaged to a particular degree. This observation is related with the swelling behavior of resin in high-state positive ion solutions. The swelling capacity also decreased with increasing valency of the metal ions. |
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真强必胜: 金币+2, 谢谢 2014-10-19 21:05:32
haizhoubuer: 金币+5, 翻译EPI+1, ★★★★★最佳答案, 太棒了! 2014-10-21 22:46:22
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3.3. 形态分析 图3显示,树脂在不同液体介质的SEM图像。干树脂表面和横截面的SEM图像见图3(a)和(b)。从图3(b)可见,通过对β-CD与AA和AM接枝共聚产生的树脂具有清晰,分层的岩石结构,且含有大量细孔(图3(b)),这增加了吸附表面积,提高了交换和吸附过程。在蒸馏水,氯化钠,氯化钙,和氯化铝溶液中,树脂的SEM图像分别见图3(C) - (F)。吸收后,树脂内部结构在里面形成一个明显的三维多边形网络,而网络大小随着金属离子价态的增加而减小。在钙离子和铝离子溶液中,树脂的三维网状结构被破坏到特定程度。这一观察结果与树脂在高态正离子溶液中的溶胀性能有关。随着金属离子化合价的增加,树脂的溶胀能力也降低。 |
3楼2014-10-19 11:25:38
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