Engineering hierarchical FeS2/TiO2 nanotubes on Ti mesh as a tailorable flow-through catalyst belt for all-day-active degradation of organic pollutants and pathogens
“…1g) display the lattice fringe distances of 0.35 nm and 0.31 nm, which are assigned to the (101) plane of TiO 2 and the (111) plane of FeS 2 , respectively. 49 The clear interface between TiO 2 and FeS 2 again proves the formation of the FeS 2 @TiO 2 nanobelt array.…”
Ammonia (NH3) is necessary for industry and daily life. Nitrate (NO3-) existing in both surface water and underground water is harmful to the environment and human body. Electrochemical NO3- reduction...
“…1g) display the lattice fringe distances of 0.35 nm and 0.31 nm, which are assigned to the (101) plane of TiO 2 and the (111) plane of FeS 2 , respectively. 49 The clear interface between TiO 2 and FeS 2 again proves the formation of the FeS 2 @TiO 2 nanobelt array.…”
Ammonia (NH3) is necessary for industry and daily life. Nitrate (NO3-) existing in both surface water and underground water is harmful to the environment and human body. Electrochemical NO3- reduction...
“…Additionally, the low potential photogenerated holes in the valence band of pyrite are recombined by the photogenerated electrons in the conduction band of TiO 2 , facilitated by the internal electric field. Consequently, the photogenerated electrons in the conduction band of pyrite and the holes in the valence band of TiO 2 are effectively utilized for TC reduction, resulting in a higher photocatalytic efficiency of TiO 2 /NP for TC degradation 69 – 71 . Figure 6 ( a ) TC Removal efficiency under different systems at optimal conditions ([TC] = 30 mg/L, pH = 7, catalyst doe = 2 g/L and light intensity = 60 mW/cm 2 ), ( b ) variation profiles of pseudo-first-order rate constants of TC degradation.…”
In this study, TiO2 nanoparticles were employed as a photocatalyst for the degradation of tetracycline (TC) under visible light irradiation. The TiO2 nanoparticles were decorated on natural pyrite (TiO2/NP) and characterized using XRD, FTIR, and SEM–EDX methods. This study evaluated the impacts of various operational parameters such as pH, catalyst dosage, initial TC concentration, and light intensity on TC removal. The findings revealed that under optimal conditions (pH 7, catalyst: 2 g/L, TC: 30 mg/L, and light intensity: 60 mW/cm2), 100% of TC and 84% of TOC were removed within 180 min. The kinetics of TC elimination followed a first-order model. The dominant oxidation species involved in the photocatalytic elimination of TC was found to be ·OH radicals in the TiO2/NP system. The reuse experiments showed the high capability of the catalyst after four consecutive cycles. This study confirmed that the TiO2/NP system has high performance in photocatalytic TC removal under optimized experimental conditions.
“…Guo CdS/FeS 2 S-scheme heterojunction generate hydrogen gas higher than pristine CdS and FeS 2 [39]. Wang et al prepare FeS 2 /TiO 2 nanocomposites by successive ionic layer adsorption reaction and they indicate that the as-synthesized nanocomposite is very e cient for destruction of organic molecules and bacteria [40]. Kaur et al synthesis Au/FeS 2 as optoelectronic nanoparticles for removal of industrial pollutant under visible light radiations.…”
Precise tunable of heterojunctions with strong redox power is future challenge in photocatalytic treatment of wastewater and energy production. The circuit of the heterojunction must carefully built of two semiconductors aligned in band gap structure with large redox potential difference. Sonicated FeS2/TiO2 magnetic heterojunctions containing various proportion of FeS2 [0-10%] are synthesized for expelling rhodamine B dye under solar radiations. Magnetic FeS2 nanoparticles are synthesized through controlled sonochemical route with precise drying under N2-atmosphere to avoid the simultaneous oxidation of Fe2+ to Fe3+ ions. Different compositions of black magnetic FeS2 nanoparticles are deposited sonochemically on TiO2 surface. The nanostructure, crystalline and optical properties of the solid specimens are thoroughly evaluated by HRTEM, BET, Zeta potential measurements, and XRD, PL and DRS techniques. Black magnetic FeS2 nanoparticles are efficiently transfer the absorbability of the heterojunction to deep visible and NIR regions by exceptional reducing the band gap energy of TiO2 from 3.22 to 1.47 eV. The electron-hole recombination is effectively depressed by 50 % as elucidated from PL analysis. The photocatalytic reactivity of FeS2/TiO2 outperformed TiO2 and FeS2 by 1.4 and 1.6 times in removal of RhB dye. Delightfully, 95 % of RhB dye degrades effectively on the heterojunction containing 95 wt % TiO2 and 5 wt % FeS2 during two hours of light illumination compared with 97% removal over pristine titania. This extra-ordinary efficiency is ascribed to impulsive role of FeS2 in elevating the electron-hole transportation and separation. A wealth of S-scheme heterojunction charge transportation mechanism is verified through scrubber trapping experiments and PL measurements of terephthalic acid. The hole-electron pair accumulated in the valence and conduction bands of TiO2 and FeS2 nanoparticles, respectively are the spacious charge carriers consumed in the photodegradation process. In conclusion, magnetic S-scheme FeS2/TiO2 heterojunction can convert full solar absorption spectrum into chemical energy dissipated in destruction of toxic organic dye emerged from different wastewater resources.
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