Dai Xiaojun,Feng Sheng,Wu Wei,Zhou Yun,Ye Zhiwei,Wang Yang,Cao Xun
To improve the photocatalytic activity of Bi 2 WO 6 , ZIF-8 was successfully introduced with the in-situ growth for the first time. The addition of ZIF-8 effectively inhibited the recombination of photogenerated electron–hole pairs with further improved electron utilization efficiency. The superoxide anion, .O 2 − , generated, greatly improved the photocatalytic activity. The performance of Bi 2 WO 6 /ZIF-8 in the photodegradation of tetracycline (TC) was studied under different conditions, including the proportions of ZIF-8, the dosage of catalyst, and the concentration of TC. The results indicated that 10 mg of B/Z/5/1 offered the best photocatalytic activity under UV light, achieving 97.8% degradation of TC (20 mg/L) within 80 min. The measured rate constant (k) for TC degradation was almost 3 times that of pure Bi 2 WO 6 . The effects of pH, HA, and inorganic anions on the degradation of TC were also studied for the simulated real water. Further, B/Z/5/1 could be reutilized up to five cycles without reduction of the catalysis performance. Therefore, the Bi 2 WO 6 /ZIF-8 heterojunction composite material can be utilized as an efficient photocatalyst for remediation of environmental pollution.
Photocatalytic technology has emerged as a research hotspot, with the selection of photocatalytic materials being crucial to its success. Bismuth tungstate exhibits excellent visible-light photocatalytic activity as a photocatalyst; however, its application in pollutant removal is constrained by its low specific surface area and rapid recombination of photogenerated carriers. This study employs a solvothermal method to synthesize Bi2WO6 materials and prepares a Bi2WO6/ZIF-8 composite nanomaterial to enhance the photocatalytic performance of bismuth tungstate. The structure and morphology of the catalysts were characterized using XRD, SEM, XPS, FTIR, and BET techniques. The photocatalytic properties were evaluated by measuring UV-vis diffuse reflectance spectra, photoluminescence, electrochemical impedance, and photocurrent density. The visible-light-driven catalytic degradation of bromocresol purple (BCP) was assessed. Results indicate the successful synthesis of the Bi2WO6/ZIF-8 composite nanomaterial, achieving a 94.65% degradation rate for BCP. Under visible light, the photocatalytic reaction rate constants of Bi2WO6/ZIF-8 were 3.91 times and 21.56 times higher than those of Bi2WO6 and ZIF-8, respectively. Consequently, the Bi2WO6/ZIF-8 composite nanomaterial can effectively remove dyes from wastewater.
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