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Removal of Reactive Blue 182 dye by a heterogeneous Fenton-like process using modified fly ash

Description: The degradation of Reactive Blue 182 (RB182) dye by a heterogeneous Fenton-like reaction using iron-modified fly ash was investigated. The experimental data indicated that the iron-modified fly ash could be used as an effective Fenton catalyst for the degradation of RB182.

Textile is one of the mainstream industries with an important strategic position in the development of the national economy in Vietnam. However, due to the specific characteristics of a complex manufacturing industry that utilizes much water, chemicals, materials, etc. The risk of environmental pollution caused by the textile industry is inevitable. Wastewater from the textile industry is one of the major environmental problems in Vietnam and many other countries. The environmental pollution due to the textile industry is multidimensionally causing serious problems not only to the landmass fertility but also to the natural flora, fauna, as well as aquatic bodies. Consequently, dyes have to be removed from textile wastewater before discharge. Basically, dyes can be removed from aqueous solutions by many different techniques, typically chemical and physical techniques such as flocculation, electric coagulation, adsorption, membrane, anaerobic and aerobic biotechnology, chemical techniques such as advanced oxidation processes. Among the advanced oxidation processes, the Fenton process is known as a powerful tool to solve the pollution problem of organic pigments. This solution is said to have many advantages such as efficient decomposition of pollutants, low-cost price; it operates under favorable condition and chemicals used in the treatment process does not affect the environment. However, this method has its limitations, such as it forms a large amount of iron sludge after the treatment process and the cost of disposing of iron sludge is usually high: iron ions can be inactivated when they interact or create complex forms with ions such as phosphate or some intermediate oxidation products. The heterogeneous Fenton processes with lower cost and friendly with the environment can overcome those disadvantages of the homogeneous Fenton processes. Several Fenton heterogeneous catalysts are synthesized on the basis of minerals or iron-containing solid waste products such as kaolin, pyrite ash, fly ash, and red mud. Fly ash is an industrial solid waste of burning power plants produced approximately 300 million tons per year globally. In many places, fly ash is taken directly to the landfills, causing serious environmental pollution. Currently, fly ash can be used as additives or construction materials, sorbents, or catalysts for the oxidation of H2S, methane, sodium sulfite. However, a few pieces of information involving the uses of fly ash as the catalyst for the purpose of decomposing dye in the water are published. In this article, fly ash was modified and used as a catalyst for the heterogeneous Fenton process, which is applied in the degradation of Reactive Blue 182.


Innovator(s): Nguyen Hoang Dam Thuyen, Nguyen Hoang Ngan Linh, Nguyen Hoang Tung Lam, Nguyen Thi Bich Phuong

Category: Biotechnology

Country: Vietnam

Gold Award