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北京石油化工学院2026年研究生招生接收调剂公告
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haizhoubuer

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[求助] 亲们,江湖告急,求翻译!

When the swelling reaches a particular extent, the network expansion power became much smaller, and the complexing action of COO− on the resin graft chains with bivalent and trivalent metal cation causes the graft chains that cross-link the resin network structure to shrink (Pourjavadi, Amini- Fazl, & Hosseinzadeh, 2005; Hua & Wang, 2009). This result leads to the leakage of absorbed water; thus, a maximum in swelling with time was observed (Wang & Wang, 2010). The stability constant order of the complexes produced by bivalent and trivalent metal ions with COO− is greater for Ca2+ than in Al3+ because the stability of the complexes formed by bivalent and trivalent metal cations with the resin is much higher than that by monovalent cations (Zhao, Su, Fang, & Tan, 2005). The resin in bivalent and trivalent metal cation solutions exhibits overswelling. The ionic radius of Na+ is smaller than that of Ca2+ and Al3+ at the same plasma strength conditions, and the swelling capacity of the resin in Na+ is higher than in Ca2+ and Al3+. At concentrations from 0.01 mol/L to 0.1 mol/L, the swelling capacity of the resin was highest in NaCl (NaCl > CaCl2 > AlCl3).

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zzbean

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【答案】应助回帖

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真强必胜: 金币+2 2014-10-19 21:07:01
haizhoubuer: 金币+5, 翻译EPI+1, ★★★★★最佳答案, 太棒了! 2014-10-21 22:50:01
haizhoubuer(RXMCDM代发): 金币+10 2014-10-23 23:07:08
haizhoubuer(RXMCDM代发): 金币+10 2014-10-23 23:11:10
当膨胀达到一定程度时,该网络结构向外扩张的力将会小很多,而且树脂枝链上的COO-键与二、三价金属阳离子间的配位作用会导致与树脂网络间存在交叉耦合的枝链发生收缩。(后面是引用的文献)
这会引起吸附水的渗出,这样就可以在一定时间内观察到膨胀的最大量。
二价及三价金属阳离子与COO-键间配位作用的稳定性强弱顺序为:Ca2 高于Al3+,因为树脂与二、三价金属离子间的配位作用的稳定性远强于与一价离子间的配位。
树脂处在二价及三价金属离子的溶液中时会出现过度膨胀。在相同的等离子强度下钠离子的离子半径远小于钙离子和铝离子,且树脂在钠离子(溶液)中的膨胀量远高于在钙离子和铝离子(的溶液)中的膨胀量。当浓度由0.01mol/L增加到0.1mol/L时,树脂在氯化钠中的膨胀量达到最大值(NaCl > CaCl2 > AlCl3)。
2楼2014-10-19 09:34:03
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