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首页> 外文期刊>Advances in Environmental Technology >Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite
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Removal of copper (II) from aqueous solutions by sodium alginate/hydroxy apatite hydrogel modified by Zeolite

机译：沸石改性的海藻酸钠/羟基磷灰石水凝胶从水溶液中去除铜（II）

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The study presented in this article investigated the removal of copper ions from aqueous solutions by a synthetic hydrogel-forming adsorbent polymer based on sodium alginate (SA) and hydroxy apatite (HA) nanoparticles. The effect of adding Zeolite on the adsorption performance of this hydrogel was also investigated, and the optimum amount of Zeolite was determined by changing its quantity. The FTIR spectrum determined the structure of the synthesized adsorbent; non-continuous adsorption tests were performed to study the kinetics and thermodynamics of adsorption and also the recovery of the adsorbent. The degree of adsorption of the synthesized nanocomposite was compared with that of Zeolite, and the results showed that the maximum adsorption capacities of Zeolite and the nanocomposite for Cu ions were 29.7 and 75.8 mg/g, respectively. The kinetic studies indicated that the process of adsorption of Cu ions on both absorbents followed a pseudo second order kinetic equation. It took the Zeolite and the hydrogel 90 and 120 minutes, respectively, to reach equilibrium. The thermodynamic studies showed that Cu absorption by both adsorbents matched the Langmuir isotherm very well (R2=0.99). Since adsorbent recovery and its lifespan are of significant importance in absorption processes, recovery was carried out by hydrochloric acid (2% by weight). The repulsion coefficient of the recovered adsorbent and its efficiency in five recovery cycles were measured. The results of the tests indicated that the repulsion coefficient of Cu was 70-82.75 percent and the adsorption efficiency of Cu after 5 recovery cycles was 75 percent of the initial adsorbent.
机译：本文提出的研究研究了基于藻酸钠（SA）和羟基磷灰石（HA）纳米颗粒的合成水凝胶型吸附剂聚合物从水溶液中去除铜离子的方法。还研究了添加沸石对该水凝胶的吸附性能的影响，并通过改变沸石沸石的量来确定其最佳用量。 FTIR光谱确定了合成吸附剂的结构。进行非连续吸附测试以研究吸附的动力学和热力学以及吸附剂的回收率。将合成的纳米复合材料与沸石的吸附度进行比较，结果表明，沸石和纳米复合材料对Cu离子的最大吸附容量分别为29.7和75.8 mg / g。动力学研究表明，两种吸收剂上Cu离子的吸附过程均遵循伪二级动力学方程。沸石和水凝胶分别花费了90分钟和120分钟才能达到平衡。热力学研究表明，两种吸附剂对铜的吸收都与Langmuir等温线非常匹配（R2 = 0.99）。由于吸附剂的回收及其寿命在吸收过程中非常重要，因此用盐酸（2％（重量））进行回收。测量了回收的吸附剂的排斥系数及其在五个回收循环中的效率。试验结果表明，Cu的排斥系数为70-82.75％，经过5个回收循环后，Cu的吸附效率为初始吸附剂的75％。

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