Chemistry Department, Faculty of Science & Arts, Yildiz Technical University, Davutpasa, Esenler, 34220, Istanbul, Turkey.
Chemistry Department, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey.
J Hazard Mater. 2021 Feb 5;403:123652. doi: 10.1016/j.jhazmat.2020.123652. Epub 2020 Aug 14.
Radioactive cesium ion (Cs-137) removal from wastewater was investigated by novel composite adsorbents, chitosan-bone powder (CS-KT) and chitosan-bone powder-iron oxide (CS-KT-M) at 25 and 50 °C. The characterization of adsorbents was performed by Fourier-Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Brunauer-Emmett-Teller and Barrett-Joyner-Hallenda (BET-BJH), and Atomic Force Microscopy (AFM) analyses. While BET surface areas of CS-KT and CS-KT-M adsorbents were found to be 131.5 and 144.9 m/g, respectively, average pore size and pore volume values were 4.69 nm/0.154 cm/g and 7.49 nm/0.271 cm/g, respectively. Amongst Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) models, Langmuir model fits well for Cs ion sorption by these adsorbents. The maximum adsorption capacity obtained from Langmuir adsorption isotherm was 0.98 × 10 mol/g at 25 °C, and 1.16 × 10 mol/g at 50 °C for CS-KT; it was found to be 1.79 × 10 mol/g at 25 °C and 2.24 × 10 mol/g at 50 °C for CS-KT-M. FT-IR analyses showed that Cs sorption occurs by its interaction with CO, PO and -NH groups. The average adsorption energy "E" was calculated as ca.11 kJ/mol from D-R adsorption isotherm. The adsorption kinetics was interpreted well by pseudo-second order model.
采用壳聚糖-骨粉（CS-KT）和壳聚糖-骨粉-氧化铁（CS-KT-M）新型复合吸附剂，在 25 和 50°C 下研究了废水中放射性铯离子（Cs-137）的去除。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X 射线衍射（XRD）、Brunauer-Emmett-Teller 和 Barrett-Joyner-Hallenda（BET-BJH）以及原子力显微镜（AFM）分析对吸附剂进行了表征。CS-KT 和 CS-KT-M 吸附剂的 BET 表面积分别为 131.5 和 144.9 m/g，平均孔径和孔体积值分别为 4.69nm/0.154cm/g 和 7.49nm/0.271cm/g。在 Freundlich、Langmuir 和 Dubinin-Radushkevich（D-R）模型中，Langmuir 模型更适合这些吸附剂对 Cs 离子的吸附。从 Langmuir 吸附等温线获得的最大吸附容量在 25°C 时为 0.98×10 mol/g，在 50°C 时为 1.16×10 mol/g，对于 CS-KT；在 25°C 时为 1.79×10 mol/g，在 50°C 时为 2.24×10 mol/g，对于 CS-KT-M。FT-IR 分析表明，Cs 吸附是通过其与 CO、PO 和-NH 基团的相互作用发生的。从 D-R 吸附等温线计算出平均吸附能“E”约为 11 kJ/mol。准二级动力学模型很好地解释了吸附动力学。
