Kinetics-controlled lattice relaxation enables selective lead extraction from hazardous jarosite waste
Kinetics-controlled lattice relaxation enables selective lead extraction from hazardous jarosite waste
研究概述
通过煅烧–淬冷使含铅黄钾铁矾废渣形成高缺陷亚稳晶格，利用弛豫时Na⁺与Pb²⁺扩散速率差异，选择性排出Pb而保留Fe骨架。铅提取率74.6%，Pb/Fe选择性14.74∶1，约为常规酸浸14倍。原位电镜、XRD、XAS及计算支持动力学控制分离机制。
谱图与表征信息
Fig. 4. Defect evolution during calcination-quenching. (a) XAS spectra at normalized Fe K-edge, (b) Fourier transform plots derived from the k2-weighted EXAFS spectra at Fe K-edge, (c) wavelet transform plots of the k2-weighted EXAFS signals for Fe2O3, pristine, and quenched Pb-natrojarosite. (d) O K-edge sXAS spectra, (e) Fe L-edge sXAS spectra for pristine and quenched Pb-natrojarosite. (calcinating temperature is 400 ◦C, quenching cycles are 5, calcinating time is 30 min and 1 h, quenching medium is 4 ◦C 0.5 mol L−1 NaCl solution).