A facile synthesis method was developed to prepare two-dimensional oxygen-containing MXene for the efficient removal of Hg(II) from aqueous solutions. The material exhibits exceptional selectivity in mixed divalent metal ion systems due to its abundant surface oxygen functional groups, which facilitate strong interactions with mercury ions. Batch adsorption experiments were conducted using both mercuric chloride (HgCl₂) and mercury nitrate (Hg(NO₃)₂) solutions under varying pH and temperature conditions. At pH 5.0 and 30 °C, the Langmuir maximum adsorption capacity reached 1057.3 mg/g for Hg(NO₃)₂ and 773.3 mg/g for HgCl₂, demonstrating outstanding performance even in highly acidic environments (pH = 2.0). Under these conditions, over 99% removal efficiency was achieved for Hg(II) concentrations up to 100 mg/L.
Chemical speciation analysis revealed that Hg(II) exists in diverse forms depending on pH and anion type. In chloride-rich environments, species such as HgCl₂(aq), HgClOH(aq), and HgCl⁺ dominate, while in chloride-free systems, Hg²⁺ and Hg(OH)⁺ are prevalent. Despite this complexity, the MXene adsorbent maintained high adsorption capacity across different chemical forms, indicating robust adaptability. The adsorption process is governed by electrostatic attraction and chemisorption via hydroxyl and oxygen-containing functional groups on the MXene surface.c-Jun Antibody site XPS and FTIR analyses confirmed shifts in binding energy and vibrational modes after adsorption, particularly for Ti–O and O–H bonds, confirming their involvement in the interaction.
Kinetic studies showed rapid uptake within the first 200 minutes for Hg(NO₃)₂ and up to 400 minutes for HgCl₂, suggesting differences in adsorption mechanisms based on speciation. Pseudo-second-order kinetics provided the best fit (R² > 0.94), indicating chemically controlled processes. Intra-particle diffusion models did not pass through the origin, implying multiple rate-limiting steps, while Boyd model analysis indicated liquid film diffusion as the dominant control mechanism (D ≈ 1.1 × 10⁻⁸ cm²/s). Adsorption isotherms followed the Freundlich model (R² = 0.982 and 0.961), suggesting multilayer adsorption on heterogeneous surfaces.1716-12-7 MedChemExpress
Notably, the adsorbent demonstrated excellent reusability.PMID:35110385 After nine consecutive cycles of adsorption-desorption using 0.2 M HCl regeneration, the removal efficiency remained above 96%, with only a 3.5% loss in capacity compared to the initial cycle. This highlights the material’s stability and practical potential for real-world wastewater treatment. Overall, this study establishes oxygen-containing MXene as a highly effective, selective, and reusable adsorbent for Hg(II) removal, capable of functioning efficiently under variable environmental conditions.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com