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首页> 外文期刊>Environmental Technology >Sorption behavior of Eu(Ⅲ) from an aqueous solution onto modified hydroxyapatite: kinetics, modeling and thermodynamics
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Sorption behavior of Eu(Ⅲ) from an aqueous solution onto modified hydroxyapatite: kinetics, modeling and thermodynamics

机译：水溶液中Eu（Ⅲ）在改性羟基磷灰石上的吸附行为：动力学，模型和热力学

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摘要

Nano-pore hydroxyapatite (HAP) was prepared using physical activation of raw and chemically modified [using Acid; HNO3 (HAPA) or Base; NaOH (HAPB)] bone char (BC) by heating at 900 degrees C for 1hr to obtain HAP9, HAPA9 and HAPB9, respectively. Investigation the effects of thermal and chemical treatment of prepared nano-hydroxyapatite on elemental analysis, FTIR, scanning electron microscopy, surface area and consequently, the sorption behavior of Eu (III) ions onto the prepared nano-pore hydroxyapatite. Batch adsorption technique was used and the obtained results revealed that the optimum pH=5.0. The % removal of europium (III) using HAPA9 and HAPB9 reach to 100% within 15min, while HAP9 after 180min and the pseudo-second-order was found to be fit to the experimental data. According to Langmuir model, the maximum sorption capacities (q(m)) were 123.8, 384.9 and 74.2mgg(-1) for HAP9, HAPA9 and HAPB9, respectively. The reaction is spontaneous according to G degrees value. HCl (0.5M) was the most efficient desorbing agent for recovery of Eu(III) and regeneration of adsorbents. Finally, nano-pore hydroxyapatite (HAP) was low cost and very effective adsorbent for sorption or recovery of Eu(III) from aqueous solutions and remediation of environmental pollution.
机译：纳米孔羟基磷灰石（HAP）的制备是通过对未加工的和化学改性的原料进行物理活化而完成的。 HNO3（HAPA）或碱； NaOH（HAPB）]骨炭（BC）通过在900摄氏度下加热1小时来分别获得HAP9，HAPA9和HAPB9。研究制备的纳米羟基磷灰石的热处理和化学处理对元素分析，FTIR，扫描电子显微镜，表面积以及因此的Eu（III）离子在制备的纳米孔羟基磷灰石上的吸附行为的影响。使用间歇吸附技术，获得的结果表明最佳pH = 5.0。使用HAPA9和HAPB9去除min（III）的百分比在15分钟内达到100％，而发现180分钟后的HAP9和拟二级反应符合实验数据。根据Langmuir模型，HAP9，HAPA9和HAPB9的最大吸附容量（q（m））分别为123.8、384.9和74.2mgg（-1）。根据G度值，反应是自发的。 HCl（0.5M）是用于回收Eu（III）和吸附剂再生的最有效的脱附剂。最后，纳米孔羟基磷灰石（HAP）是低成本且非常有效的吸附剂，用于从水溶液中吸附或回收Eu（III）以及修复环境污染。

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