Manganese oxides (MnO₂) are widely applied in heavy metal ions removal due to their low-cost, environmental-friendly and biocompatibility. However, the adsorption capacity of MnO₂ need to be further improved to satisfy the demand of practical application. Herein, a highly dispersed single layer Na_xK_yMnO₂ nanosheet was synthesized by a facile wet-chemical method with sodium dodecyl sulfonate as surfactant. The high surface specific area, excellent dispersibility and abundant oxygen vacancies endowed Na_xK_yMnO₂ nanosheets with potential in heavy metal ions adsorption. The adsorption experiments results showed that Na_xK_yMnO₂ nanosheets possessed high efficiency and selectivity towards lead ion (Pb²⁺) with a high adsorption capacity of 2091.8 μmol g⁻¹. The Na_xK_yMnO₂ also showed an excellent reusability with the removal rate of 95.4% for Pb²⁺ even after five cycles. Moreover, both the theoretical calculation and experimental data illustrated that the single layer Na_xK_yMnO₂ nanosheets possess high selectivity to Pb²⁺ adsorption.

锰氧化物（MnO ₂）由于其低成本，环保和生物相容性而被广泛应用于重金属离子的去除。然而，需要进一步提高MnO ₂的吸附能力以满足实际应用的需求。在此，以十二烷基磺酸钠为表面活性剂，通过简便的湿化学法合成了高度分散的Na _x K _y MnO ₂单层纳米片。高比表面积，出色的分散性和丰富的氧空位使Na _x K _y MnO ₂纳米片具有重金属离子吸附的潜力。吸附实验结果表明，Na _xK _y MnO ₂纳米片具有较高的效率和对铅离子（Pb ²⁺）的选择性，并具有2091.8μmolg ^-1的高吸附容量。Na _x K _y MnO ₂也显示出极好的可重复使用性，即使经过五个循环，对Pb ²⁺的去除率也达到95.4％。此外，理论计算和实验数据均表明，单层Na _x K _y MnO ₂纳米片具有对Pb ²⁺吸附的高选择性。