Design,Preparation Of V₂O₅ And Its Composites And Their Application In Wastewater Treatment

As a consequence of rapid population growth and industrial development,environmental pollution has become an increasingly serious problem over the last few decades.However,the organic dyes used in textile,tanning,printing,cosmetics and other industries pose a great threat to water resources.The untreated and random discharge of dye wastewater has caused serious water pollution,which has seriously polluted the ecosystem and water resources.This is why researchers have worked to find a way in which environmental remediation can be achieved.Researchers have paid much attention to processes such as adsorption and photocatalysis,which can be used to remove organic pollutants from wastewater in a green and recyclable way.Most of the adsorbents can achieve the optimal adsorption capacity under neutral conditions,but the adsorption performance is poor under acidic or alkaline conditions.In addition,single metal oxide semiconductor photocatalysts are unable to deliver the desired photocatalytic performance due to their own high photogenerated carrier combination rate.Based on the above problems,three kinds of materials were prepared based on V₂O₅ in this paper,and their performance was studied in the field of sewage treatment.（1）In this study,dandelion-like V₂O₅ was prepared by hydrothermal method.The amount of CTAB was found to play a key role in the morphological regulation of the V₂O₅product.The bare V₂O₅ exhibits excellent adsorption performance of MB.The adsorbent not only can work under acidic/alkaline conditions but also show better adsorption performance than that in neutral environment.The adsorption experiments showed that the1.0-200-V₂O₅ adsorbent reached adsorption equilibrium in only 30 min at C₀=40 mg·g^-1,p H=9 and T=25℃and achieved more than 90%removal of MB(Qmax of 74.4 mg·g^-1).（2）The Ag₃PO₄/CeO₂/V₂O₅ ternary composite photocatalyst was prepared by combining hydrothermal,high-temperature solid-phase and precipitation methods,and a double Z-scheme heterojunction was successfully constructed.The effects of Ag₃PO₄loading on the structure,performance and visible light response activity of Ag₃PO₄/CeO₂/V₂O₅ ternary composite photocatalysts were investigated.The composite had the best photocatalytic activity when the Ag₃PO₄ loading was 50%,and it achieved 99.1%degradation of MB within 24 min of visible light irradiation,and the degradation rate of MB of the composite still reached 95%after four cycles,indicating that the composite has excellent cyclic stability,which is due to the addition of Ag₃PO₄ significantly improving the photocatalytic performance of the product.（3）Double Z-scheme Ag₂MoO₄/Bi₂MoO₆/V₂O₅ ternary composite photocatalyst were prepared by a combination of hydrothermal,high-temperature solid-phase and precipitation methods.The degradation of Rh B under visible light shows that the Ag₂MoO₄/Bi₂MoO₆/V₂O₅ ternary composite photocatalyst has an outstanding ability to degrade Rh B.The results showed that when the loading capacity of Ag₂MoO₄ was 40%,the degradation rate of Rh B reached 95.4%after 12 minutes of visible light exposure.At the same time,the composite also showed excellent cycling stability,maintaining a degradation rate of around 90%for Rh B after four cycles.