Synthesis of NiFe₂O₄@AC/UiO‐66(Zr) for Enhancement of the Photocatalytic Performance of Alizarin Yellow R Under Visible‐light

Abstract

In this study, NiFe2O4@AC/UiO‐66(Zr) composites were successfully prepared with different ratios of UiO‐66(Zr) as support for NiFe2O4@AC, (1 : 1), (2 : 1) and (3 : 1) named NiFe2O4@AC/UiO‐66(Zr)‐1, NiFe2O4@AC/UiO‐66(Zr)‐2 and NiFe2O4@AC/UiO‐66(Zr)‐3, respectively. The prepared composites were characterized by X‐Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X‐Ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), ultraviolet‐visible diffuse reflectance (UV‐Vis/DRS) spectroscopy, PL (Photoluminescence) study. The synthesized composites′ efficiencies to enhance the photodegradation of alizarin yellow R (AYR) under visible‐light were evaluated. The results identified that NiFe2O4@AC/UiO‐66(Zr)‐2 is the most photoreactive photocatalyst with the lowest bandgap ∼1.7 eV. NiFe2O4@AC/UiO‐66(Zr)‐2 shows higher photodegradation efficiency (97.9 %) compared to NiFe2O4@AC/UiO‐66(Zr)‐1 and NiFe2O4@AC/UiO‐66(Zr)‐3 with photodegradation efficiency of 75.1 % and 89.9 %, respectively after 180 min under visible‐light. The photodegradation reaction of AYR was found to be pseudo first‐order reaction, and the rate constant (Ka) for NiFe2O4@AC/UiO‐66(Zr)‐1, NiFe2O4@AC/UiO‐66(Zr)‐2, and NiFe2O4@AC/UiO‐66(Zr)‐3 are 0.0072 min−1, 0.0204 min−1, and 0.0122 min−1, consecutively. The effects of various conditions such as initial concentration and photocatalyst dose on the photodegradation of AYR were determined. The high photodegradation efficiency of NiFe2O4@AC/UiO‐66(Zr)‐2 composite is because of the heterojunction and effective charge transfer between NiFe2O4@AC and UiO‐66(Zr). NiFe2O4@AC/UiO‐66(Zr)‐2 photocatalyst exhibits photocatalytic stability and reusability up to five cycles.

Visible Light‐Driven BiOBr/Bi2S3@CeMOF Heterostructured Hybrid with Extremely Efficient Photocatalytic Reduction Performance of Nitrophenols: Modeling and Optimization

“…After each cycle, the catalyst was collected and washed with deionized water three times before the next cycle. It is distinct that the BiOBr/Bi 2 S 3 @CeMOF preserved good stability with a decrease of 10.2±1.91 % in reduction efficiency after the five cycles (Figure S3a, ESI) that demonstrate the efficiency and stability of the prepared catalyst as well as the applicability of the prepared photocatalyst for industrial applications [55] . Besides, the recovered photomaterial was characterized by XRD to examine the possible change in their crystallization after five cycles.…”

“…It is distinct that the BiOBr/ Bi 2 S 3 @CeMOF preserved good stability with a decrease of 10.2 � 1.91 % in reduction efficiency after the five cycles (Figure S3a, ESI) that demonstrate the efficiency and stability of the prepared catalyst as well as the applicability of the prepared photocatalyst for industrial applications. [55] Besides, the recovered photomaterial was characterized by XRD to examine the possible change in their crystallization after five cycles. The XRD pattern (Figure S3b, ESI) exhibits the same characteristic peaks of the BiOBr/Bi 2 S 3 @CeMOF before the photoreduction process.…”

Photocatalytic Degradation Properties of Nano‐lignocellulose⋅NiNiO/GR‐TiO2 Hollow Rod Composite for Methylene Blue

“…This XRD pattern agreed with the formation of Ni nanoparticles (JCPDS 04-0850). [37] The peaks of the anatase TiO 2 of catalytic materials appear at 2θ values of 25.3°(101), 37.8°(004), 48.1°(200), 53.8°( 105), 55.2°(211) and 63.0°(204). TiO 2 supported on cellulose metallized showed anatase form indicating it has not changed its crystal structure.…”

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

“…Other examples of MOF-based S-scheme photocatalysts include investigations of the activity of NiFe 2 O 4 @AC/UiO-66 in the degradation of alizarin yellow R 185 and nitrogen-doped carbon quantum dots (NDCQDs)/ZIF-8 in the decomposition of MB. 186 Khalk et al 186 found that NDCQDs/ZIF-8 photocatalyst has an increased dye adsorption and, therefore, is characterized by an improved photocatalytic activity in the degradation of MB compared to the pristine MOF.…”

“…Other examples of MOF‐based S‐scheme photocatalysts include investigations of the activity of NiFe 2 O 4 @AC/UiO‐66 in the degradation of alizarin yellow R 185 and nitrogen‐doped carbon quantum dots (NDCQDs)/ZIF‐8 in the decomposition of MB 186 . Khalk et al 186 .…”