Highly Efficient Separation of Trivalent Minor Actinides by a Layered Metal Sulfide (KInSn2S6) from Acidic Radioactive Waste

The elimination of trivalent minor
actinides (Am3+,
Cm3+) is of great concern for the safe management and operation
of nuclear waste geological repository and environmental remediation.
However, because of the effects of protonation, most of the present
sorbents exhibit inferior removal properties toward minor actinides
at low pH values. Finding stable ion-exchangers with high sorption
capacities, fast kinetics, and good removal toward minor actinides
from highly acidic solution remains a great challenge. This work reports
a new family member of KMS materials with a robust acid-stable layered
metal sulfide structure (KInSn2S6, KMS-5) bearing
strong affinity toward trivalent minor actinides. KMS-5 can simultaneously
separate trivalent 241Am and 152Eu from acidic
solutions below pH 2 with high efficiency (>98%). The ion-exchange
kinetics is extremely fast (

三价次锕系元素（如Am3+、Cm3+）的去除对于核废料地质储存库的安全管理和环境修复至关重要。然而，由于质子化的影响，大多数现有的吸附剂在低pH值下对次锕系元素的去除性能较差。寻找具有高吸附容量、快速动力学和良好去除性能的稳定离子交换剂，以从高酸性溶液中去除次锕系元素，仍然是一项重大挑战。本研究报道了一种新型KMS材料家族成员——具有耐酸稳定的层状金属硫化物结构（KInSn2S6，KMS-5），该材料对三价次锕系元素具有强烈的亲和力。KMS-5能够在pH值低于2的酸性溶液中高效地同时分离241Am和152Eu三价同位素（去除率大于98%）。其离子交换动力学极为迅速（