Eu-Doped Zeolitic Imidazolate Framework-8 Modified Mixed-Crystal TiO2 for Efficient Removal of Basic Fuchsin from Effluent

Abstract

Zeolitic imidazolate framework-8 (ZIF-8) was doped with a rare-earth metal, Eu, using a solvent synthesis method evenly on the surface of a mixed-crystal TiO2(Mc-TiO2) structure in order to produce a core–shell structure composite ZIF-8(Eu)@Mc-TiO2 adsorption photocatalyst with good adsorption and photocatalytic properties. The characterisation of ZIF-8(Eu)@Mc-TiO2 was performed via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller analysis (BET) and ultraviolet–visible light differential reflectance spectroscopy (UV-DRs). The results indicated that Eu-doped ZIF-8 was formed evenly on the Mc-TiO2 surface, a core–shell structure formed and the light-response range was enhanced greatly. The ZIF-8(Eu)@Mc-TiO2 for basic fuchsin was investigated to validate its photocatalytic performance. The effect of the Eu doping amount, basic fuchsin concentration and photocatalyst dosage on the photocatalytic efficiency were investigated. The results revealed that, when 5%-Eu-doped ZIF-8(Eu)@Mc-TiO2 (20 mg) was combined with 30 mg/L basic fuchsin (100 mL) under UV irradiation for 1 h, the photocatalytic efficiency could reach 99%. Further, it exhibited a good recycling performance. Thus, it shows certain advantages in its degradation rate and repeatability compared with previously reported materials. All of these factors suggested that, in an aqueous medium, ZIF-8(Eu)@Mc-TiO2 is an eco-friendly, sustainable and efficient material for the photocatalytic degradation of basic fuchsin.

Direct Formation of ZIF-8 Crystal Thin Films on the Surface of a Zinc Ion-Doped Polymer Substrate

“…XRD measurements of the obtained sample confirmed the formation of ZIF-8 crystals on the polyimide substrate, and a characteristic peak originating from (110) plane of ZIF-8 was observed around 7.3 degrees, and all other peaks with weak intensity were assigned to the simulated ZIF-8 and halo patterns of the polyimide (Figure 1C). Moreover, XPS measurement of the obtained sample showed that the binding energy of 2p 3/2 orbital of Zn was observed at 1022.0 eV, which is consistent with the literature value [43], indicating the formation of ZIF-8 crystals (Figure S1A). of Zn was observed at 1022.0 eV, which is consistent with the literature value [43], indicating the formation of ZIF-8 crystals (Figure S1A).…”

“…Moreover, XPS measurement of the obtained sample showed that the binding energy of 2p 3/2 orbital of Zn was observed at 1022.0 eV, which is consistent with the literature value [43], indicating the formation of ZIF-8 crystals (Figure S1A). of Zn was observed at 1022.0 eV, which is consistent with the literature value [43], indicating the formation of ZIF-8 crystals (Figure S1A). Our previous approach using a NaNO3 additive led to the rapid elution of doped Zn 2+ at the initial stage of the reaction, resulting in the formation of a large amount of free Zn 2+ in the reaction solution.…”

Influence of Au, Ag, and Cu Adatoms on Optical Properties of TiO2 (110) Surface: Predictions from RT-TDDFT Calculations

“…Titanium dioxide (TiO 2 ) was reported in 1972 as a prospective material for photocatalytic water splitting [1]. TiO 2 is one of the most studied and applied photocatalytic materials with low cost, nontoxicity, stability, and diversity of applications [2][3][4][5][6][7][8][9][10][11][12][13][14]. The fundamental mechanism of photocatalysis water splitting is dependent on the formation of photogenerated charge.…”

Excited State Calculations of Cu-Doped Anatase TiO2 (101) and (001) Nanofilms

“…In recent decades, heterogeneous photocatalysis has emerged as a promising pathway for advancing green technologies, particularly in the domains of photocatalytic water splitting, the degradation of hazardous organic pollutants, and the manifestation of robust antibacterial properties [1,2]. The comprehensive investigation underscores the significance of TiO 2 -based materials, attributing their appeal to environmentally benign attributes such as non-toxicity, stability, cost-effectiveness, and wide-ranging applicability [3][4][5][6][7][8][9][10][11][12][13][14][15]. Central to photocatalysis are mechanisms involving the generation of photogenerated charges, encompassing processes such as photo-induced charge separation, bulk and surface charge recombination, and surface charge reactions [16].…”