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首页> 外文期刊>Environmental Science & Technology >Stabilization and Mineralization Mechanism of Cd with Cu-Loaded Attapulgite Stabilizer Assisted with Microwave Irradiation
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Stabilization and Mineralization Mechanism of Cd with Cu-Loaded Attapulgite Stabilizer Assisted with Microwave Irradiation

机译：微波辅助负载铜的凹凸棒稳定剂对镉的稳定和矿化机理

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摘要

Cadmium (Cd) in soil was stabilized using copper loaded attapulgite (Cu/ATP) in a microwave (MW) system. Excellent Cd stability in soil was achieved with Cu/ATP addition due to higher adsorption energy (1.38 eV) of Cu/ATP for Cd than that of ATP (similar to 1 eV), confirmed by density functional theory calculations. The strong hybridization of the s,p-orbitals of Cd with the s,p,-orbitals of Cu on ATP contributed to the strong interactions between Cd and Cu/ATP. The stability performance of Cd in Cu/ATP-treated soil was further enhanced after MW irradiation through a series of phase transformation to more stable Cd-bearing crystalline minerals. The transformation was initiated by MW-induced "hot spots", which created cationic vacancy on Cu/ATP surface and enhanced the solid-state reactions between Cd and Cu/ATP framework. The total bond orders of Cd in the formed CdAl4O7 crystalline mineral elevated to 3.38, which was 5-fold higher than that for Cd on Cu/ATP, ensuring the long-term stability of Cd even after 360 curing days. Cd contaminated soil from a former industrial electroplating site was successfully stabilized with the proposed strategy. The research provides an effective stabilization strategy as well as a comprehensive understanding of the mechanism of long-term Cd stabilization.
机译：使用载有铜的凹凸棒土（Cu / ATP）在微波（MW）系统中稳定土壤中的镉（Cd）。密度泛函理论计算证实，由于添加了Cu / ATP，Cu / ATP对Cd的吸附能比ATP高（约1 eV），因此在土壤中具有出色的Cd稳定性。 Cd的s，p轨道与Cu的s，p，轨道在ATP上的强杂交导致Cd与Cu / ATP之间的强相互作用。 MW辐照后，Cd在Cu / ATP处理过的土壤中的稳定性表现通过一系列相变，转变为更稳定的Cd晶体矿物。该转变由MW诱导的“热点”引发，其在Cu / ATP表面上产生阳离子空位并增强了Cd与Cu / ATP骨架之间的固态反应。形成的CdAl4O7晶体矿物中Cd的总键序提高到3.38，这比Cu / ATP上Cd的键序高5倍，即使经过360天的固化，也能确保Cd的长期稳定性。拟议的策略成功地稳定了原工业电镀场中的Cd污染土壤。该研究提供了有效的稳定策略以及对Cd长期稳定机理的全面理解。

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