Highly efficient visible-light-driven reduction of Cr(vi) from water by porphyrin-based metal–organic frameworks: effect of band gap engineering on the photocatalytic activity

Abstract

Highly efficient visible-light-assisted photocatalytic reduction of Cr(VI) to Cr(III) from water using multifunctional Zr(IV)-porphyrin MOFs, Zr6(μ3-OH)8(OH)8(MTCPP)2, (PCN-222(M)) (M = H2, ZnII, CuII, NiII, CoII, FeIIICl, and MnIIICl) is presented. The...

Terephthalate and trimesate metal–organic frameworks of Mn, Co, and Ni: exploring photostability by spectroscopy

“…12 Owing to visible light response and excellent redox behavior, these MOF photocatalysts are being explored for CO 2 reduction, solar water splitting, photoreduction, photochemical transformations of small molecules, and photocatalytic degradation of organic pollutants. [13][14][15][16][17][18][19] One of the requirements for an efficient photocatalyst is its long-term photostability. Since the metalligand interactions in MOFs are coordinative, they are subjected to break under UV/visible irradiations.…”

A series of POM compounds constructed using a flexible ligand containing three coordination groups: electrocatalytic and photocatalytic reduction and amperometric detection of Cr(vi)

“…S9b–S11b (ESI†), as the pH value increases from 1 to 4, the photocatalytic reduction efficiency gradually decreases. The redox reaction of Cr( vi ) to Cr( iii ) is as follows: 15 Cr 2 O 7 2− + 14H + + 6e − → 2Cr 3+ + 7H 2 O…”

“…In 2020, Sharma et al prepared Zr( iv )-porphyrin MOFs, which showed high photocatalytic activity with a 100% reduction of Cr( vi ) to Cr( iii ) within 25 min. 15 In 2020, Miyagawa et al synthesized four amino acid Schiff base Cu( ii ) complexes with hydroxy groups, which could be used as photocatalysts to effectively drive the reduction of Cr( vi ) to Cr( iii ). 16 There are only a few studies on using POM-based compounds as photocatalysts to catalyze the reduction of Cr( vi ) to Cr( iii ).…”

Synthesis and characterization of boehmite/metal – Organic framework of type AlO(OH)/MOF‐74(Zn) for photocatalytic degradation of Congo red dye

“…[17][18][19][20][21] MOFs composite (e.g., connection to suitable active materials such as inorganic materials, organic compounds, and polymers) can overcome these limitations. [22][23][24][25] To the best of our knowledge, there are no reports about the hybrid of MOFs with AlO(OH). AlO(OH) and MOF share common characteristics of high surface affinity and tunable morphological and structural features such as shape, specific surface area, and pore/particle size but differ in thermal/mechanical stability and structural flexibility.…”