Hebei Key Laboratory of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Hebei Key Laboratory of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
J Hazard Mater. 2021 Jun 15;412:125237. doi: 10.1016/j.jhazmat.2021.125237. Epub 2021 Jan 26.
Herein, a FeO decorated attapulgite adsorbent (FA) is fabricated for the removal of Cd(II) from wastewater, and subsequently a feasible strategy for converting the saturated waste adsorbent to CdS/FA photocatalyst is reported. Owing to the in situ growth of FeO on the attapulgite (ATP), the FA adsorbents exhibit enlarged surface area and increased adsorption sites. More importantly, the strong interaction between FeO and ATP leads to changes of coordination environment around the O‒Fe‒O bond with the ATP. Based on the results of density functional theory calculations, the electrons are more readily transferred from Fe to O, and the hanging O atoms with more electronegativity act as the efficient adsorption sites for Cd(II), efficiently improving the adsorption performance of the FeO phases. Furthermore, the waste FA adsorbent could be conveniently separated from the treated water by magnets and converted to CdS/FA photocatalyst, which exhibits satisfying degradation efficiency for tetracycline with low concentration. This work provides a potential strategy to optimize the ATP-based materials for heavy ions adsorption and reutilize the waste adsorbents.
在此，制备了一种 FeO 修饰的凹凸棒石吸附剂（FA），用于从废水中去除 Cd(II)，随后报道了一种将饱和废吸附剂转化为 CdS/FA 光催化剂的可行策略。由于 FeO 在凹凸棒石（ATP）上的原位生长，FA 吸附剂表现出更大的表面积和更多的吸附位点。更重要的是，FeO 和 ATP 之间的强相互作用导致 ATP 周围 O-Fe-O 键的配位环境发生变化。基于密度泛函理论计算的结果，电子更容易从 Fe 转移到 O，具有较高电负性的悬挂 O 原子作为 Cd(II)的有效吸附位点，有效地提高了 FeO 相的吸附性能。此外，废 FA 吸附剂可通过磁铁方便地从处理水中分离出来，并转化为 CdS/FA 光催化剂，该光催化剂对低浓度四环素具有令人满意的降解效率。这项工作为优化基于 ATP 的材料用于重金属离子吸附并重新利用废吸附剂提供了一种潜在的策略。
