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首页> 外文期刊>Separation and Purification Technology >Ion exchange properties of strontium on in situ precipitated polyantimonic acid in amberlite XAD-7
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Ion exchange properties of strontium on in situ precipitated polyantimonic acid in amberlite XAD-7

机译：锶在Amberlite XAD-7中原位沉淀的聚对im酸上的离子交换性质

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Polyantimonic acid was precipitated in the pores of Amberlite XAD-7(PAA-XAD)and studied for the ion exchange of strontium as a function of various parameters,such as time,strontium ion concentration and temperature.Nearly 30% of the Sb_2O_5 was impregnated into XAD-7 exhibiting an experimental capacity of 23 mg/g of strontium.Distribution coefficient of strontium on PAA-XAD was found to be 6069 mL/g at 0.1 mol/L nitric acid and it decreased with increase in the concentration of nitric acid.Rapid uptake in the initial stages of equilibration was observed followed by sluggish rate of exchange and the ion exchange reaction was found to follow the second order rate equation.The rate constant and energy of activation for such reaction were found to be 8.4 x 10~(-3)Lmg~(-1)min~(-1)at 300 K and 79 kJ/mol,respectively.The data obtained in this study were fitted into Langmuir adsorption model and Langmuir constants obtained at various temperatures were utilized for estimating the enthalpy change(DELTAH~deg)accompanied by the ion exchange.The performance of the sorbent under dynamic conditions was evaluated by following a breakthrough curve using simulated waste solutions.
机译：在Amberlite XAD-7（PAA-XAD）的孔中沉淀出聚对im酸，研究锶的离子交换与时间，锶离子浓度和温度等各种参数的关系，其中将近30％的Sb_2O_5被浸渍进入XAD-7的实验容量为23 mg / g的锶。在0.1 mol / L硝酸中，锶在PAA-XAD上的分布系数为6069 mL / g，并且随着硝酸浓度的增加而降低在平衡初期观察到快速吸收，随后交换速率缓慢，发现离子交换反应遵循二阶速率方程，反应速率常数和活化能为8.4 x 10〜在300 K和79 kJ / mol时分别为（-3）Lmg〜（-1）min〜（-1）。将本研究中获得的数据拟合到Langmuir吸附模型中，并利用在不同温度下获得的Langmuir常数进行估算焓变e（DELTAH〜deg）伴随离子交换。动态条件下吸附剂的性能通过使用模拟废物溶液遵循穿透曲线来评估。

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