Department of Applied Chemistry & Chemical Engineering, University of Dhaka, Dhaka, 1000, Bangladesh.
Polymer and Petrochemical Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, 11727, Egypt.
Chemosphere. 2021 May;270:128668. doi: 10.1016/j.chemosphere.2020.128668. Epub 2020 Oct 17.
Sustainable materials are urgently desired for treatment of radioactive cesium (Cs) contaminated water to safe-guard the public health. Apart from the synthetic ligand-based materials, the Mangrove charcoal modified adsorbent was fabricated for assessing of Cs removal from waste sample. The raw charcoal was oxidized using nitrification approach and diverse oxygen containing carboxyl, carbonyl and hydroxyl functional groups were introduced. After modification, the adsorbent characteristics were drastically changed as compared to the charcoal during the measurement of FTIR, N adsorption-desorption isotherms and SEM micrographs. The data clarified that charcoal modified adsorbent was exhibited high Cs transport through the inner surface of the adsorbent based on bonding ability. The adsorbent was shown comparatively slow kinetics to Cs ion; however, the adsorption capacity was high as 133.54 mg/g, which was higher than the crown ether based conjugate materials. The adsorption data were followed to the Langmuir adsorption isotherms and the monolayer coverage was possible due to the data presentation. The presence of high amount of Na and K were slightly interfered to the Cs adsorption by the charcoal modified adsorbent, however; the Na and K concentration was 350-600 folds higher than the Cs concentration. Then the proposed adsorbent was selective to Cs for the potential real radioactive Cs contaminated water. The volume reduction was established rather than desorption and reuses advantages. More than 99% volume reduction was measured by burning of Cs adsorbed adsorbent at 500 °C for ensuring the safe storage and disposal of used adsorbent. Therefore, the charcoal modified adsorbent may open the new door to treat the Cs containing wastewater.
为了保障公众健康，人们急需可持续的材料来处理放射性铯（Cs）污染的水。除了合成配体基材料外，还制备了改性后的红树林木炭吸附剂，用于评估从废水中去除 Cs 的效果。采用硝化方法对原木炭进行氧化，引入了多种含氧羧基、羰基和羟基官能团。改性后，与木炭相比，吸附剂的特性在傅里叶变换红外光谱（FTIR）、氮气吸附-解吸等温线和扫描电子显微镜（SEM）图谱的测量中发生了显著变化。数据表明，改性后的吸附剂通过基于键合能力的吸附剂内部表面表现出高 Cs 传输性能。与 Crown Ether 基缀合材料相比，该吸附剂对 Cs 离子的动力学较慢，但吸附容量较高，达到 133.54mg/g。吸附数据遵循 Langmuir 吸附等温线，由于数据呈现，单层覆盖是可能的。高浓度的 Na 和 K 存在会略微干扰木炭改性吸附剂对 Cs 的吸附，但 Na 和 K 的浓度是 Cs 浓度的 350-600 倍。因此，该吸附剂对潜在的真实放射性 Cs 污染水具有选择性。与解吸和再利用的优势相比，建议的吸附剂优先进行体积减少。通过在 500°C 下燃烧吸附 Cs 的吸附剂，可以实现超过 99%的体积减少，以确保已使用吸附剂的安全储存和处置。因此，改性后的木炭吸附剂可能为处理含 Cs 废水开辟了新的途径。
