A novel Neodymium-formate coordination polymer for the adsorptive removal of organic dyes: kinetics, isotherms, and mechanistic insights

Mulimani P. Rego R.M. Katti M. Asritha S.S.C. Kumar S. Suiindik Z. Jeevan Rao H. Kammakakam I. Kurkuri M.D. Kalkhambkar R.G.
5 July 2026 Elsevier B.V.

Separation and Purification Technology
2026 #394

Coordination polymers have emerged as versatile materials for water remediation owing to their structural tunability and rich coordination environments. Building on these advantages, this work reports the synthesis of a Nd-formate coordination polymer (Nd-formate CP) synthesized via in situ ligand generation, wherein dimethylformamide undergoes partial hydrolysis under solvothermal conditions to produce formate ligands that coordinate with Nd³⁺ centers. The structural, morphological, and chemical characteristics of the synthesized Nd-formate CP were systematically characterized, confirming the development of a crystalline coordination framework with distinct metal-ligand interactions and structural stability. The as-synthesized Nd–formate CP was evaluated for its effectiveness in the adsorptive removal of organic dyes from aqueous solutions. Under acidic to nearly neutral pH conditions, adsorption tests showed remarkable removal efficiency (>95–96%) toward Congo Red (CR) and Trypan Blue (TB). Kinetic analysis revealed a strong correlation with the pseudo-second-order model (R² > 0.998), indicating that a predominantly chemically driven adsorption process plays a dominant role in the adsorption. Langmuir isotherm fitting confirmed high-capacity monolayer adsorption behaviour. Carbonate species considerably decreased absorption because of competitive complexation with Nd³⁺ sites, but salt tolerance studies showed no influence from NaCl, NaNO₃, and Na₂SO₄. The practical applicability was further demonstrated using a continuous-flow setup, confirming its effective dye removal under dynamic operating conditions. Overall, the findings indicate that Nd-formate CP is a cost-effective, stable, and highly efficient adsorbent suitable for industrial dye remediation.

Adsorption , Coordination polymers , Nd-formate , Real-time application , Water remediation

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Department of Chemistry, Karnatak Universitys Karnatak Science College, Karnataka, Dharwad, 580001, India
Centre for Research in Functional Materials (CRFM), JAIN (Deemed-to-be University), Jain Global Campus, Karnataka, Bengaluru, 562112, India
Department of Food Technology, Faculty of Engineering and Technology, JAIN (Deemed-to-be University), Jain Global Campus, Karnataka, Bengaluru, 562112, India
Department of Chemistry, Nazarbayev University, 53 Kabanbay Batyr Ave, Astana, 010000, Kazakhstan
Nazarbayev University Research Administration, Astana, 010000, Kazakhstan

Department of Chemistry
Centre for Research in Functional Materials (CRFM)
Department of Food Technology
Department of Chemistry
Nazarbayev University Research Administration

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026