Novel Bi₂WO₆‐coupled Fe₃O₄ Magnetic Photocatalysts: Preparation, Characterization and Photodegradation of Tetracycline Hydrochloride

Abstract

Novel Bi WO -coupled Fe O magnetic photocatalysts with excellent and stable photocatalytic activity for degrading tetracycline hydrochloride and RhB were successfully synthesized via a facile solvothermal route. Through the characterization of the as-prepared magnetic photocatalysts by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra, it was found that the as-prepared magnetic photocatalysts were synthesized by the coupling of Bi WO and Fe O , and introduction of appropriated Fe O can improve nanospheres morphology and visible-light response. Among them, BFe2 (0.16% Fe O ) exhibited the best photocatalytic activity for degradation of tetracycline hydrochloride (TCH), reaching 81.53% after 90 min. Meanwhile, the as-prepared magnetic photocatalysts showed great separation and recycle property. Moreover, the results of electrochemical impedance spectroscopy demonstrated that the well conductivity of Fe O can promote photogenerated charge carriers transfer and inhibit recombination of electron-hole pairs, so that Bi WO /Fe O exhibited enhanced photocatalytic activity on degradation of TCH and RhB. Hence, this work provides a principle method to synthesize Bi WO /Fe O with excellent photocatalytic performance for actual application, in addition, it showed that introduction of Fe O not only can provide magnetism, but also can enhance photocatalytic activity of Bi WO /Fe O magnetic photocatalysts.

Application of Magnetic Composites in Removal of Tetracycline through Adsorption and Advanced Oxidation Processes (AOPs): A Review

“…The e − and h + could further react with electron donors and acceptors on the surface of semiconductor to generate free radicals [163]. However, there were some limits occurring in the photocatalyst utilization, including low utilization of solar energy [164], high recombination rate of the photogenerated electron-holes [165], low stability, and difficult separation from water [26]. Therefore, the heterogeneous photocatalysts were developed to enhance the efficiency of pollutant degradation.…”

“…The 200 mL TC with a concentration of 100 mg/L could be entirely degraded and the degradation kinetics fitted well with the pseudo-second-order model. In addition, Wang et al [165] Nasseh et al [137] prepared magnetically separable FeNi 3 /SiO 2 /ZnO nano-composite to degrade TC under simulated sunlight. Khodadadi et al [53] prepared FeNi 3 @SiO 2 @TiO 2 nanocomposite to remove TC by photo-catalytic degradation in simulated wastewater.…”

Au and Co3O4 anchored Bi2WO6 with enhanced electron paramagnetic resonance, surface plasmon resonance, nonlinear and magnetic properties

“…Additionally, it is difficult to separate the recovery of the photocatalyst during synthesis and practical application. The magnetic property can provide easy pathway for sample separation and recovery in photochemistry and photobiology 18 …”

“…The magnetic property can provide easy pathway for sample separation and recovery in photochemistry and photobiology. 18 Even though there were numerous p-n structured materials based on BWO in the past, such as CuBi 2 O 4 , 19 CdS, 6 Bi 2 Sn 2 O 7 , 20 etc. After careful literature review, the very latest BWO-based p-n structures include the pn-type composites with Ta 3 N 5 , 21 CuAlO 2 , 22 Co 3 O 4 , 23 β-Bi 2 O 3 , 24 BioCl, 25 TiO 2 , 26 CuS 27 and even ternary p-n structured Bi 2 S 3 /MoS 2 , 28 Au/Bi 2 WO 6 /BiOBr, 29 and hybrid quaternary polyvinylidene fluoride/CdS/Bi 2 WO 6 /ZnO 30 and CdS/Bi 2 MoO 6 /BiOBr.…”

Antibiotics Contaminated Irrigation Water: An Overview on Its Impact on Edible Crops and Visible Light Active Titania as Potential Photocatalysts for Irrigation Water Treatment

“…Solar light-activated photocatalytic degradation of ABs is an efficient, safe, residue-free, economical, and ecofriendly method to remove tetracyclines from wastewater, especially under visible light and ambient conditions (Homem and Santos, 2011;Wei et al, 2020). Various semiconductors and photocatalysts have been investigated for the photocatalytic degradation of tetracyclines including ZnO, TiO 2 , WO 3 , CdS, Fe 3 O 4 , g-C 3 N 4 , ZnS, and Bi 2 O 3 (Niu et al, 2013;Zhu et al, 2013;Zhang et al, 2014;Li et al, 2015;Vázquez et al, 2016;Wang T. et al, 2017;Yan et al, 2020). Semiconductors based on Titania (TiO 2 ) are the most widely studied catalysts due to their low cost, high stability, low toxicity, good activity, and ease of modification (Teoh et al, 2012;Ibhadon and Fitzpatrick, 2013;Koe et al, 2019;You et al, 2019;Zhang et al, 2019).…”