A novel method to fabricate La-doped MIL-88B(Fe)–NH ₂ mixed-metal–organic frameworks is reported. The prepared rare earth-doped MOFs show remarkable photocatalytic performance for the removal of Cr( vi ) in aqueous media.

Lead is a non-biodegradable heavy metal that easily accumulates in the human body, causing anemia, cancer, renal kidney disease, nervous system damage and mental retardation. In this study, a new lead adsorbent of graphene@Fe–Mg–Cu ternary oxide composite was successfully fabricated using a one-spot thermal decomposition approach. The prepared material was fully characterized via scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), electron dispersive spectroscopy (EDS), BET surface area and X-ray photoelectron spectroscopy (XPS). The lead adsorption behaviour of the prepared graphene@Fe–Mg–Cu ternary oxides was studied by batch and column experiments. The adsorption isotherm was described by both the Langmuir and Freundlich models and the sorption kinetics of lead adsorption by the composite was found to be pseudo-second order. The graphene@Fe–Mg–Cu ternary oxides exhibited exceptional and fast adsorption of lead over a wide range of solution pHs with remarkable durability, selectivity, and recyclability, which could make this composite a very promising candidate for effective removal of lead from aqueous solutions.

In this work, a g-C₃N₄/porphyrin nanocomposite was fabricated through the self-assembling of monomeric Tetrakis (4-carboxyphenyl) porphyrin (TCPP) molecules with g-C₃N₄ nanomaterials. The characterizing results showed a good distribution of TCPP nanofibers with a diameter of < 100 nm and several micrometers in length on the g-C₃N₄ nanoflakes’ surfaces. The prepared g-C₃N₄/porphyrin nanocomposite had two bandgap energies of 2.38 and 2.7 eV, which could harvest a wide range of photon energy in the light spectrum, particularly in visible light. The obtained C₃N₄/TCPP nanocomposite revealed a remarkable photodegradation efficiency toward rhodamine B dyes, with a RhB removing rate of 3.3 × 10⁻² min⁻¹. The plausible mechanism for the photocatalytic performance of the g-C₃N₄/porphyrin photocatalyst for the RhB dye’s degradation was also studied and discussed.

Metal-organic complexes are one of the most studied materials in the last few decades, which are fabricated from organic ligands and metal ions to form robust frameworks with porous structures. In this work, iron-1,4-benzenedicarboxylic-polyethylene glycol (Fe-BDC-PEG) with a porous structure was successfully constructed by an iron(III) benzene dicarboxylate and polyethylene glycol diacid. The drug-delivery properties of the resultant Fe-BDC-PEG were tested for the loading and release of the 5-fluorouracil compound. The maximal loading capacity of Fe-BDC-PEG for 5-fluorouracil was determined to be 348.22 mg/g. The drug release of 5-fluorouracil-loaded Fe-BDC-PEG after 7 days was 92.69% and reached a maximum of 97.52% after 10 days. The 7 day and acute oral toxicity of Fe-BDC-PEG in mice were studied. The results show that no reasonable change or mortality was observed upon administration of Fe-BDC-PEG complex in mice at 10 g/kg body weight. When the uptake of Fe-BDC-PEG particles in mice was continued for 7 consecutive days, the mortality, feed consumption, body weight, and daily activity were negligibly changed.