QSPR model for estimation of photodegradation average rate of the porphyrin-TiO2 complexes and prediction of their biodegradation activity and toxicity: Engineering of two annihilators for water/waste contaminants

Sustainable Gold Nanoparticle (Au-NP) Growth within Interspaces of Porphyrinic Zirconium-Based Metal-Organic Frameworks: Green Synthesis of PCN-224/Au-NPs and Its Anticancer Effect on Colorectal Cancer Cells Assay

In this work, a simple green synthesis method of the novel metal-organic framework (MOF) nanocomposite PCN-224/Au-NPs (Au-NPs = gold nanoparticles) is described. In this regard, initially, PCN-224 was synthesized. Afterward, in a single-step, one-pot procedure, under visible-light irradiation, Au-NPs were fabricated on PCN-224. The cytotoxicity effect of the synthesized PCN-224/Au-NPs nanocomposite was investigated in human colon cancer cells. Determination of the apoptosis induction was done by the Annexin- V/propidium iodide flow cytometry method. Besides, to ascertain the biocompatibility of the synthesized sample, the cytotoxicity of PCN-224/Au-NPs was evaluated on the human embryonic kidney (HEK)-293 cell line. The substantial anticancer activity with the biocompatibility of the structure, the green facile synthesis, and the MOF surface of the synthesized nanocomposite make it special for utilization in therapeutic applications.

Enhanced Photocatalytic CO2 Reduction by Novel Designed Porphyrin-Based MOFs: From Accurate QSPR Model to Experimental Exploration

A reliable quantitative structure-property relationship (QSPR) model was established for predicting the evolution rate of CO₂ photoreduction over porphyrin-based metal-organic frameworks (MOFs) as photocatalysts. The determination coefficient (R ²) for both training and test sets was 0.999. The root-mean-squared error of prediction (RMSEP) obtained was 0.006 and 0.005 for training and test sets, respectively. Based on the proposed model, two porphyrin-based MOFs, Cu-PMOF and Co-PMOF, were designed, synthesized, and applied for CO₂ photoreduction under UV-visible irradiation without any additional photosensitizer. The X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), and Fourier transform infrared (FTIR) measurements revealed the successful formation of the porous MOFs. The N₂ adsorption isotherms at 77 K showed a high Brunauer-Emmett-Teller (BET) surface area of 932.64 and 974.06 m²·g^-1 for Cu-PMOF and Co-PMOF, respectively. Theoretical and experimental results showed that HCOOH evolution rates over Cu-PMOF and Co-PMOF were (127.80, 101.62 μmol) and (130.6, 103.47 μmol), respectively. These results were robust and satisfactory.

Self-Supported 3D-Printed Lattices Containing MXene/Metal-Organic Framework (MXOF) Composite as an Efficient Adsorbent for Wastewater Treatment

Metal-organic frameworks (MOFs) are well-known porous crystalline materials that have been used for the removal of organic pollutants from wastewater. To enhance the adsorption performance of these adsorbents and facilitate their recycling process, we propose a hybrid composite of an MXene/metal-organic framework (MXOF) decorated on a hierarchical and self-supported porous three-dimensional (3D) printed lattice structure (3D-MXOF). In this design, the porous MXOF composite extremely enhanced the specific surface area and synergistically promoted the dye removal efficiency of 3D-printed lattices. Scanning electron microscopy images indicated that the MXOF composite was uniformly decorated on a 3D-printed lattice structure without agglomeration. The resultant supported 3D-MXOF structures were evaluated for the adsorption of anionic dyes. The results revealed high adsorption performance (91.98% for methyl orange and 84.9% for direct red 31 dyes) and fast adsorption kinetics following a pseudo-first-order kinetic model. Moreover, the 3D-MXOF structure possesses a facile recycling process with sustainable adsorption performance after four consecutive adsorption-desorption cycles.

Mechanism of a double-channel nitrogen-doped lignin-based carbon on the highly selective removal of tetracycline from water

A high-performance nitrogen-doped lignin-based carbon material (ILAC-N) was synthesized using industrial lignin and urea by hydrothermal and activation, as an absorbent of tetracycline hydrochloride (TC). The results showed that the ILAC-N comprises a double-channeled structure with micro and mesopores. It exhibits an excellent adsorption capacity of TC across a wide pH range (pH 2-11), with the highest adsorption capacity of 1396 mg g^-1 at 323 K. Tests in actual wastewater showed that the TC removal rate by ILAC-N exceeded 97.4%. Moreover, it maintained a removal rate of 84% after 10 regeneration cycles, revealing its high reusability. Mechanisms suggested that pore filling and π-π interaction played a critical role in this process. In conclusion, ILAC-N can be broadly applied to livestock manure and pharmaceutical wastewater treatment, owing to its high adsorption capacity, good adsorption properties across a wide pH range, excellent reusability. Furthermore, this research opens a new path for lignin utilization.