Department Seminar - of Amit Embar - Removal of acid dye from concentrated synthtetic effluent synthtetic using self-made photo membrane reactor
School of Mechanical Engineering Seminar
Monday, August 2 2021 at 14.00
Removal of acid dye from concentrated synthtetic effluent synthtetic using self-made photo membrane reactor
M.Sc. student of Hadas Maman
Wastewater from the textile dyeing industry is a growing problem. It is often rich in color and dye residues, toxic compounds, chemicals, high oxygen demand concentration, salts, and much harder degradation materials. Different textile wastewater treatment technologies already exist in the market. However, in many cases, especially with household dyeing units, the textile wastewater is not treated and discharged directly into nearby water sources. There is a growing demand for low-cost, effective, and sustainable alternatives for treatment methods, and photocatalysis occupies a prominent place as a method not only for dye degradation but for other organic contaminants as well, not only in separating the pollutant from the water but eliminates it.
This study focuses on the degradation of acid dyes from synthetic dye effluent. For the synthetic effluent, Acid Green 25 (AG-25) solution was prepared to serve as a target pollutant. As a photocatalyst (PC), the known Ultraviolet (UV)-activated TiO2 was mixed with the relatively new, visible light-activated, graphitic carbon nitride (GCN), also known as g-C3N4, to produce heterojunctions that can utilize a larger portion of the wavelength in the solar spectrum. To that end, 3 production methods were tested to create the catalysts, and in each method, different ratios of TiO2 and GCN were tested in similar conditions, both under solar-like irradiation and visible light (λ≤400 nm cutoff) to define the effect of each part in the spectrum on the degradation. Although the catalyst’s dispersed configuration is very effective in terms of degradation, it requires separation, an expensive and process-inhibitive step. To that end, Electro Phoretic Deposition (EPD) method was applied using a Nickel (Ni) foam, a metallic membrane, as a substrate to coat the catalyst on, that way it can be easily separated from the liquid. Finally, the coated Ni foam was placed in a lab-scale Photocatalytic Membrane Reactor (PMR), testing the degradation of AG-25 under the new conditions in a flow system. To increase the formation of Reactive Oxidative Species (ROSs), Hydrogen Peroxide (HP) was added at a concentration of 25 ppm.
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