This work demonstrates a novel nanomaterial for rapid, efficient and selective enrichment as well as portable separation of Hg(II) ions, which integrates the advantages of hydrophilic porous cellulose fibers and specific Hg(II) recognizing CuS nanoparticles. The optimal CuS/cellulose fibers nanomaterial (CC-60) exhibits a markedly faster adsorption rate, reaching adsorption equilibrium within 30 s, and a large Hg(II) uptake capacity as high as 1040 mg g^-1 in 2 min. The distribution coefficient (K_d) of CC-60 for Hg(II) ions is four orders of magnitude higher than those for other common metal ions, thus giving unique selectivity for Hg(II) ions in the presence of other common metal ions. CC-60 can be used in portable column devices for the sequestration of Hg(II) ions from practical water samples, rapidly lowering the Hg(II) concentration from 16.6 mg L^-1 to 9 μg L^-1 in 5 s, which surpasses all those sulfur-based materials reported thus far. Such exciting properties are closely related to the synergistic effects arising from the porous structure and hydrophilicity of cellulose fibers, the unique recognition capability of CuS towards Hg(II), and the readily accessible CuS sites on cellulose fibers. This work would open up a new avenue to materials and devices for fast recognition, sequestration, enrichment and detection of Hg(II) as well as other toxic heavy metal ions.

这项工作展示了一种新型的纳米材料，用于快速，有效和选择性富集以及Hg（II）离子的便携式分离，该材料融合了亲水性多孔纤维素纤维和识别CuS纳米颗粒的特定Hg（II）的优点。最佳的CuS /纤维素纤维纳米材料（CC-60）表现出明显更快的吸附速率，在30 s内达到吸附平衡，并且在2分钟内对Hg（II）的吸收能力高达1040 mg g ^-1。分配系数（K _dHg（II）离子的CC-60）比其他常见金属离子的CC-60高四个数量级，因此在存在其他常见金属离子的情况下对Hg（II）离子具有独特的选择性。CC-60可用于便携式色谱柱设备中，用于隔离实际水样中的Hg（II）离子，将Hg（II）的浓度从16.6 mg L ^-1迅速降低至9μgL ^-15 s内，超过了迄今为止报道的所有硫磺基材料。这种令人兴奋的特性与纤维素纤维的多孔结构和亲水性，CuS对Hg（II）的独特识别能力以及纤维素纤维上容易接近的CuS位点产生的协同效应密切相关。这项工作将为快速识别，隔离，富集和检测Hg（II）以及其他有毒重金属离子的材料和设备开辟一条新途径。