宽层间距 MoS₂ 纳米片对水中重金属 Cu（Ⅱ）的吸附性能研究

MoS₂ nanosheets with wide interlayer spacing (W-MoS₂) were synthesized via hydrothermal reaction and used for the removal of ionic Cu and complex Cu from water. The experimental results showed that W-MoS₂ achieved excellent adsorption capacities on copper ions (Cu²⁺), Citrate-Cu, and EDTA-Cu in water, and its adsorption isotherm were described by the Langmuir model. The maximum calculated adsorption capacities of Cu²⁺, Citrate-Cu, and EDTA-Cu were 55.71, 23.45, and 9.72 mg/g, respectively. The adsorption of Cu²⁺ onto MoS₂ reached equilibrium within 90 min, while the adsorption of Citrate-Cu and EDTA-Cu on MoS₂ reached equilibrium within 240 min. The adsorption kinetics followed the pseudo-second-model. In addition, MoS₂ showed excellent selectivity for all three forms of Cu(Ⅱ). XPS and FTIR analysis indicated that the adsorption mechanism of Cu²⁺, Citrate-Cu, and EDTA-Cu on W-MoS₂ is the coordination reaction between the abundant S group and Cu on the surface. This study offers a technical reference for removing various forms of Cu(Ⅱ) from wastewater using MoS₂ nanomaterials.