Adsorption of Uranyl Ions at the Nano-hydroxyapatite and Its Modification.
Adsorption of Uranyl Ions at the Nano-hydroxyapatite and Its Modification.
复制标题
DOI：
10.1186/s11671-017-2042-8
复制
发表时间：
2017-12
影响因子：
--
通讯作者：
Bolbukh Y
中科院分区：
文献类型：
--
作者：
Skwarek E;Gładysz-Płaska A;Bolbukh Y
采用湿法制备了纳米羟基磷灰石及其改性物过量磷羟基磷灰石（P-HAP）和内置碳离子结构的羟基磷灰石（C-HAP）。通过 XRD、加速表面积和孔隙率测定法 (ASAP) 以及 SEM 对它们进行了研究。使用Scherrer方法计算的微晶尺寸为纳米羟基磷灰石(HAP) = 20 nm； P-HAP——无法确定； C-HAP = 22 nm；纳米-HAP/U(VI) = 13.7 nm； P-HAP/U(VI)—无法确定，C-HAP/U(VI) = 11 nm。确定了表征纳米 HAP/电解质和 P-HAP/电解质、C-HAP/电解质界面处双电层的基本参数：表面电荷密度和 zeta 电位。采用间歇技术研究了纳米HAP吸附剂对U(VI)离子的吸附性能。吸附过程在前 60 分钟内很快，并在大约 120 分钟（对于 P-HAP）和 300 分钟（对于 C-HAP 和 nano-HAP）内达到平衡。吸附过程符合准二级动力学。检查了 Freundlich、Langmuir-Freundlich 和 Dubinin-Radushkevich 等温线模型获得平衡吸附数据的能力。 293 K 时，P-HAP 的最大吸附能力 (q m) 为 7.75 g/g，C-HAP 为 1.77 g/g，HAP 为 0.8 g/g。
Nano-hydroxyapatite and its modification, hydroxyapatite with the excess of phosphorus (P-HAP) and hydroxyapatite with the carbon ions built into the structure (C-HAP), were prepared by the wet method. They were studied by means of XRD, accelerated surface area and porosimetry (ASAP), and SEM. The size of crystallites computed using the Scherrer method was nano-hydroxyapatite (HAP) = 20 nm; P-HAP—impossible to determine; C-HAP = 22 nm; nano-HAP/U(VI) = 13.7 nm; P-HAP/U(VI)—impossible to determine, C-HAP/U(VI) = 11 nm. There were determined basic parameters characterizing the double electrical layer at the nano-HAP/electrolyte and P-HAP/electrolyte, C-HAP/electrolyte inter faces: density of the surface charge and zeta potential. The adsorption properties of nano-HAP sorbent in relation to U(VI) ions were studied by the batch technique. The adsorption processes were rapid in the first 60 min and reached the equilibrium within approximately 120 min (for P-HAP) and 300 min (for C-HAP and nano-HAP). The adsorption process fitted well with the pseudo-second-order kinetics. The Freundlich, Langmuir–Freundlich, and Dubinin–Radushkevich models of isotherms were examined for their ability to the equilibrium sorption data. The maximum adsorption capabilities (q m) were 7.75 g/g for P-HAP, 1.77 g/g for C-HAP, and 0.8 g/g for HAP at 293 K.