“…Recent researches on nonstochiometric bismuth oxyhalides exposed great photocatalytic proficiencies owing to extensive visible-light-harvesting property and lower recombination rate of the charges. For instance, Bi have displayed considerable performances in these processes [21][22][23][24]. Among various non-stochiometric bismuth oxyhalides, Bi 5 O 7 Br has shown apparent effectiveness owing to its unique layered structure, appropriate band gap energy, and visible-light-responsive characteristic [25][26][27].…”
The emergence of persistent organic pollutants such as dyes and pharmaceuticals in the aquatic environment has created drastic concerns worldwide due to their toxicity and potential hazards to the environment. Accordingly, non-stoichiometric TiO2/Bi5O7Br nanocomposites were prepared by stirring method as a visible-light-effective photocatalyst for degradation of amoxicillin (AMX) and tetracycline (TC), as antibiotic pollutants, and Rhodamine B (RhB), methylene blue (MB), and malachite green (MG), as dye pollutants. The physiochemical properties of the samples were studied using FESEM, TEM/HRTEM, XRD, EDX, UV–vis DRS, FT-IR, XPS, BET, PL, photocurrent, and EIS analyses. The TiO2/Bi5O7Br (40%) photocatalyst performed superior to TiO2, Bi5O7Br, and TiO2/BiOBr (40%) in photodegradation of the studied contaminants. The degradation rate constants of AMX, TC, MG, RhB, and MB over the TiO2/Bi5O7Br (40%) photocatalyst were 18.2‒32.5-folds greater than pure TiO2, 1.6‒17.3 times higher than pure Bi5O7Br, and 1.4‒13 times larger than TiO2/BiOBr (40%), respectively. Quenching studies showed that superoxide anion radicals and holes had major roles in photocatalytic elimination of TC. Importantly, TiO2/Bi5O7Br (40%) nanocomposite showed robust reusability with high degree of TC removal after four successive photocatalytic recycles. This research introduces a cost-effective, efficient, and reusable visible-light-triggered binary system based on TiO2 for decontamination of medicinal and dye polluted wastewaters.
“…Recent researches on nonstochiometric bismuth oxyhalides exposed great photocatalytic proficiencies owing to extensive visible-light-harvesting property and lower recombination rate of the charges. For instance, Bi have displayed considerable performances in these processes [21][22][23][24]. Among various non-stochiometric bismuth oxyhalides, Bi 5 O 7 Br has shown apparent effectiveness owing to its unique layered structure, appropriate band gap energy, and visible-light-responsive characteristic [25][26][27].…”
The emergence of persistent organic pollutants such as dyes and pharmaceuticals in the aquatic environment has created drastic concerns worldwide due to their toxicity and potential hazards to the environment. Accordingly, non-stoichiometric TiO2/Bi5O7Br nanocomposites were prepared by stirring method as a visible-light-effective photocatalyst for degradation of amoxicillin (AMX) and tetracycline (TC), as antibiotic pollutants, and Rhodamine B (RhB), methylene blue (MB), and malachite green (MG), as dye pollutants. The physiochemical properties of the samples were studied using FESEM, TEM/HRTEM, XRD, EDX, UV–vis DRS, FT-IR, XPS, BET, PL, photocurrent, and EIS analyses. The TiO2/Bi5O7Br (40%) photocatalyst performed superior to TiO2, Bi5O7Br, and TiO2/BiOBr (40%) in photodegradation of the studied contaminants. The degradation rate constants of AMX, TC, MG, RhB, and MB over the TiO2/Bi5O7Br (40%) photocatalyst were 18.2‒32.5-folds greater than pure TiO2, 1.6‒17.3 times higher than pure Bi5O7Br, and 1.4‒13 times larger than TiO2/BiOBr (40%), respectively. Quenching studies showed that superoxide anion radicals and holes had major roles in photocatalytic elimination of TC. Importantly, TiO2/Bi5O7Br (40%) nanocomposite showed robust reusability with high degree of TC removal after four successive photocatalytic recycles. This research introduces a cost-effective, efficient, and reusable visible-light-triggered binary system based on TiO2 for decontamination of medicinal and dye polluted wastewaters.
“…Thus, the heterojunction formed between rGO and NZV-FeZn can significantly promote the separation and transfer of photogenerated charges, thereby extending their lifetime. Overall, all three tested materials exhibited good electrochemical properties 40 . Figure 10 ( a ) Photocurrent response curves recorded under full-wavelength artificial light irradiation and ( b ) Nyquist plots of rGO, NZV-FeZn, and rGO/NZV-FeZn.…”
The existence of toxic and carcinogenic pentavalent antimony in water is a great safety problem. In order to remove antimony(V) from water, the purpose of this study was to prepare a novel graphene nano iron zinc (rGO/NZV-FeZn) photocatalyst via hydrothermal method followed by ultrasonication. Herein, weakly magnetic nano-Fe–Zn materials (NZV-FeZn, GACSP/NZV-FeZn, and rGO/NZV-FeZn) capable of rapid and efficient Sb(V) adsorption from water were prepared and characterised. In particular, rGO/NZV-FeZn was shown to comprise franklinite, Fe0, and graphite. Adsorption data were fitted by a quasi-second-order kinetic equation and Langmuir model, revealing that among these materials, NZV-FeZn exhibited the best Sb removal performance (543.9 mgSb gNZV-FeZn−1, R2 = 0.951). In a practical decontamination test, Sb removal efficiency of 99.38% was obtained for a reaction column filled with 3.5 g of rGO/NZV-FeZn. Column regenerability was tested at an initial concentration of 0.8111 mgSb L−1, and the treated water obtained after five consecutive runs complied with the GB5749-2006 requirement for Sb. rGO/NZV-FeZn was suggested to remove Sb(V) through adsorption-photocatalytic reduction and flocculation sedimentation mechanisms and, in view of its high cost performance, stability, and upscalable synthesis, was concluded to hold great promise for source water and wastewater treatment.
Metal–organic framework (MOF) has attracted extensive attention in photocatalytic organic pollutants. However, most MOFs still have problems such as low response of visible light, easy recombination of electrons and holes, and complicated separation and recovery process. In this study, a facile approach was proposed to construct magnetic NH2‐MIL‐53(Fe)/NiFe2O4 photocatalyst via solvothermal method. NiFe2O4 nanoparticles with octahedral structure are closely attached onto the surface of tubular such as NH2‐MIL‐53(Fe). NH2‐MIL‐53(Fe)/NiFe2O4 has soft ferromagnetism, good paramagnetism, and magnetic response. After 210 min visible light illumination, photocatalytic efficiency of NH2‐MIL‐53(Fe)/NiFe2O4 reaches 95.71% in the condition of methylene blue (MB) concentration as high as 30 mg/L, which is much higher than that (50.11%) of NH2‐MIL‐53(Fe). After five runs, photocatalytic activity of NH2‐MIL‐53(Fe)/NiFe2O4 only decreases to 90.41%. Consequently, magnetic NH2‐MIL‐53(Fe)/NiFe2O4 photocatalyst has huge potential applications in removing organic dyes by a green and environmentally friendly way due to its high photocatalytic activity, high stability, and easy solid–liquid separation.
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