Ag‐Enhanced TiO_2–x/C Composites with Metal‐Organic Frameworks as Precursors for Photodegradation of Methyl Blue

Abstract

A series of Ag-enhanced TiO 2-x /C composites (Ag/TiO 2-x /C composites) with metal-organic frameworks (MOFs) as precursors were prepared, and their photocatalytic activities were evaluated by the UV-light driven photodegradation behaviors of methyl blue (MB). The as-obtained samples were characterized by several techniques such as SEM, XRD, N 2 -adsorption, XPS, UV/Vis spectrophotometry and UV/Vis diffuse-reflectance spectra.

Pt Modified TiO2–x/C Composites with Metal‐organic Frameworks as Precursors for Photodegradation of Organic Dye

“…The addition of · O 2 – scavenger (0.2 mmol · L –1 p ‐benzoquinone) resulted in the greatest reduction of photocatalytic efficiency, with 43.0 % MB molecules decomposed after 50 min of irradiation, but the chromaticity of the solution increased. These results suggest that the promoting effect of these reactive oxidation species on the photocatalytic degradation of MB by Pt‐modified composites decreases in the following order: • O 2 – > • OH >h + , which is consistent with the result using Ag‐modified composites and the previous report…”

“…The bandgaps of PTC‐P6 (2.9 eV), PTC‐P8 (2.8 eV), PTC‐P10 (2.7 eV) and ZTOF‐1‐P10 (3.0 eV) are smaller than that of P25 (3.3 eV), while the bandgap of PTC‐P4 (3.4 eV) is larger than that of P25. The bandgap of PTC‐P10 is smaller than that of ZTOF‐1‐P10 and ATC‐P10 (2.9 eV) . The main reason is that the Pt particles deposited on the surface of TiO 2 absorb the energy of light to generate plasma resonance with wider plasmon bands than those of Ag particles, which broaden the response range of the catalyst to light and improve the utilization of light.…”

“…However, the research of noble metal modified TiO 2– x /C composites using metal‐organic frameworks as precursors is still rare. In the previous work, we prepared noble metallic Ag modified TiO 2– x /C composites with metal‐organic frameworks as precursors . The photocatalytic properties of these composites were better than that of the unmodified TiO 2– x /C composites.…”

The rGO/BiOBr/Bi4O5Br2 Composites with Stacked Nanosheets for Ciprofloxacin Photodegradation under Visible Light Irradiation

“…On the basis of the above experiments and the energy gaps of the BiOBr (2.60 eV) and Bi 4 O 5 Br 2 (2.35 eV) catalysts reported in the literature, the feasible photocatalytic mechanism is proposed, and displayed in Figure . Under visible light irradiation, the rGO/BiOBr/Bi 4 O 5 Br 2 composites absorb the energy to generate electron‐hole pairs . The rGO can reduce the recombination of electron‐hole pairs by transferring photo‐induced electrons , , .…”

ZnII and CdII Metal Organic Frameworks Based on 2‐Methyl‐6‐oxygen‐1,6‐dihydro‐3,4'bipyridine‐5‐carbonitrile

“…Until now, a desired number of MOFs have been synthesized. [1,[5][6][7]21] Some reports confirmed bimetal-organic frameworks as supercapacitor electrode materials; [22] nanosized MOFs loading Ag/AgBr for photocatalysis; [23] anionic MOFs afforded C 2 H 2 /CO 2 and C 2 H 2 /CH 4 separation and removal of organic dyes; [24] MOFs for selective Cd 2+ detection and cell imaging; [25] Ag-enhanced MOFs for photodegradation of methyl blue; [26] Tb 3+ /Eu 3+ Co-Doped MOFs for ratiometric luminescence temperature sensing. [27] In the design and construction of MOFs, poly-carboxylate ligands have been also properties.…”