The rapid increase of industrial activities leads to serious environmental pollution, especially, in aqueous systems and particularly with heavy metals. Cadmium, one of the most poisonous elements, is rapidly accumulated in the human body, therefore, the efficient removal of cadmium ions from wastewater is an urgent need. Coordination networks (CNs) and its subdivision metal-organic frameworks (MOFs), are structured porous composites which present various special properties. In this work two CNs were used as adsorbent materials for the removal of Cd(II) ions from aqueous solutions. By the reaction of CoSO₄·7H₂O and NiSO₄·7H₂O with N,N-bis(phosphonomethyl)glycine (Gly) in hydrothermal conditions two CNs—Co–Gly and Ni–Gly— were synthesized, respectively. Cadmium adsorption onto the studied CNs was conducted in batch mode, and the effect of pH, initial concentration, contact time, temperature and sorbent weight on the sorption process were investigated. Parametric Method 3 (PM3)semi-empirical analyses of the CNs’ structural properties were performed in order to predict the adsorption properties. For this reason, two octahedral models were calculated and computational predictions were compared with the experimental results. Both computational and experimental adsorption studies found that Ni–Gly presents higher affinity for cadmium ions. Moreover, the adsorbent materials can be readily regenerated and recycled without significant loss of cadmium uptake capacity.

Biomacromolecule have a significant contribution to the adsorption of metal ions. Moreover, chitosan is one of the most studied biomacromolecule, which has shown a good performance in the field of wastewater treatment. In this context, a new adsorbent of the aminophosphonic modified chitosan-supported Ni(II) ions type was prepared from the naturally biopolymer, chitosan. In the first step, modified chitosan with aminophosphonic acid groups was prepared using the “one-pot” Kabachnik-Fields reaction. It was characterized by different techniques: FTIR, SEM/EDAX, TGA, and ³¹P-NMR. In the second step, the modified chitosan with aminophosphonic acid was impregnated with Ni(II) ions using the hydrothermal reaction at different values of pH (5, 6 and 7). The physical-chemical characteristics of final products (modified chitosan carrying aminophosphonic groups and Ni(II) ions) were investigated using FTIR, SEM images, EDAX spectra and thermogravimetric analysis. In this work, the most important objective was the investigation of the adsorbent performance of the chitosan modified with aminophosphonic groups and Ni(II) ions in the process of removing Pb(II) ions from aqueous solutions by studying the effect of pH, contact time, and Pb(II) ions concentration. For removal of Pb(II) ions from the aqueous solution, the batch adsorption method was used.

The inhibition effect of N,N′-phosphonomethylglycine (PMG) and vinyl phosphonic acid (VPA) on the 3% NaCl acidic solution corrosion of carbon steel iron was studied at different immersion times by potentiodynamic polarization, electrochemical impedance spectroscopy, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, and computational methods. It is found from the polarization studies that PMG and VPA behave as mixed-type inhibitors in NaCl. Values of charge transfer resistance (R_ct) and double layer capacitance (C_dl) in the absence and presence of inhibitors are determined. The PMG and VPA inhibitors were capable of inhibiting the corrosion process up to ≈91% and ≈85%, respectively. In the presence of PMG, the synergic effect of chlorine ions was observed. Density functional theory (DFT) was engaged to establish the adsorption site of PMG, VPA, and their deprotonated states. For studied compounds, the resulted values of E_LUMO, E_HOMO, energy gap (∆E), dipole moment (μ), electronic hardness (η), global softness (σ), electrophilic index (ω), and the electronic potential map are in concordance with the experimental data results regarding their corrosion inhibition behavior and adsorption on the metal surface.

Structurally versatile divalent metal phosphinates are studied as precursors of electrocatalysts (Co²⁺) for the OER and ORR.

This study presents a green and efficient strategy for enhancing the adsorption performance of metal–organic frameworks (MOFs) toward diclofenac (DCF), an emerging pharmaceutical contaminant frequently detected in aquatic environments. Zinc‐ and nickel‐based phosphonate MOFs using phenylphosphonic acid (PP), forming Zn and Ni phosphonate metal organic frameworks (ZnPP and NiPP), were synthesized under environmentally benign conditions and functionalized with quaternary ammonium‐ or phosphonium‐based ionic liquids to improve their affinity regarding anionic pollutants. Comprehensive physicochemical characterization confirmed successful functionalization without compromising the structural integrity of the frameworks. Ionic‐liquid modification using methyl trialkyl ammonium chloride (AmIL), trihexyl(tetradecyl)phosphonium chloride (PhIL) significantly enhanced DCF removal, with ZnPP–AmIL showing the highest adsorption capacity (q _max = 170 mg/g) due to combined electrostatic attraction, hydrogen bonding, π–π interactions, and anion‐exchange effects. Kinetic studies revealed rapid adsorption with pseudo‐second‐order behavior, while equilibrium data were best described by the Langmuir isotherm, indicating monolayer adsorption and strong adsorbent–adsorbate interactions. The materials exhibited good reusability after multiple adsorption–desorption cycles and maintained high removal efficiencies in real groundwater matrices, demonstrating minimal interference from coexisting ions. This work underscores the critical role of functionalization in optimizing adsorptive properties, showcasing the potential of ionic liquid‐functionalized MOFs as innovative materials for the efficient removal of pharmaceutical pollutants, thereby contributing to improved environmental sustainability and water quality management.