Synthesis and Photocatalytic Properties of Titanium‐Porphyrinic Aerogels

Abstract

We present novel titanium-porphyrinic gels (TPGs) and titanium-porphyrinic aerogels (TPAs), in whichp orphyrinic ligand tetrakis(4-carboxyphenyl)porphyrin is coordinated to Ti-oxo clusters.T hese hierarchically porous TPAs,w ith micro-, meso-, and macropores and reactant-concentrationdependent Brunauer-Emmett-Teller surface areas of 407-738 m 2 g À1 ,are prepared by CO 2 critical point drying of TPGs. Although the Ti 4+ ! Ti 3+ photoreduction of TPAs is less efficient than that of crystalline microporous Ti-porphyrinic framework DGIST-1, prompt diffusion of O 2 and spintrapping agents into the TPApores causes the rapid generation of reactive oxygen species (ROS), as observed by EPR spectroscopy. When used as an ROS scavenger,l arge 1,3diphenylisobenzofuran is degraded by the best-performing TPA1 0t imes faster than by DGIST-1, suggesting that the accessibility of molecules (reactants) to pores (reactive centers) strongly influences photocatalytic activity.

Self‐Foaming Metal‐Organic Gels Based on Phytic Acid and Their Mechanical, Moldable, and Load‐Bearing Properties.

“…[6] Metal-organic gels are a kind of supramolecular gels containing metal ions, metal-organic moieties, and metal nanoparticles. [7] Incorporation of metal components may enrich or modify gel morphologies, [8] and contribute to improve the optical, [9] electrochemical [10] and mechanical properties. [11,12] A variety of metal-organic gels have been developed for various applications, such as selective adsorption, [11] biosensors, [13,14] and electrocatalysis.…”

Soil Microbial Communities Altered by Titanium Ions in Different Agroecosystems of Pitaya and Grape

“…Titanium has two valence states of Ti 4+ and Ti 3+ for electronic energy transition under light. The effect of titanium ions in altering the microbial community is based mainly on its photocatalytic activity, which converts energy from light into chemical energy and triggers redox ( 40 , 41 ). Redox generates various superoxide radicals, which reduce or oxidize the surrounding medium, potentially degrading soil organic matter, pesticides, and herbicides ( 42 ).…”

Mono- and Bismetalphenanthroline-Substituted Ti12 Clusters: Structural Variance and the Effect on Electronic State and Photocurrent Property

“…Titanium-oxo clusters (TOCs) recently have received great interest − and are emerging as a class of very promising crystalline materials, promoted by their applications as well-defined and soluble molecular TiO materials, − single-source precursors of TiO oxides, − and the structural and electronic models of nanosized TiO 2 . − Despite the fact that numerous TOCs with or without modified metals or functional ligands have been reported and studied experimentally and theoretically, the calculated electronic state of small clusters (nuclearity <10) showed large variations with varied cluster nuclearity, which is not typical for nanoscale TiO materials. Therefore, synthesis of high nuclearity TOCs and theoretical study based on these large TOCs merit more attention.…”