Removal of Reactive Dyes in Textile Effluents by Catalytic Ozonation Pursuing on-Site Effluent Recycling

Abstract

The textile wash-off process consumes substantial amounts of water, which generates large volumes of wastewater that pose potential pollution issues for the environment. In the present study, catalytic ozonation was applied to degrade residual dyes present in rinsing effluents from wash-off processes towards the aim of recycling the waste effluents. A magnetic catalyst was prepared for promoting dye degradation by catalytic ozonation. Via a hydrothermal reaction, highly magnetic manganese ferrite (MnFe2O4) particles were successfully loaded on carbon aerogel (CA) materials (MnFe2O4@CA). The results showed that the developed catalyst strikingly promoted the degradation of dye contaminants by catalytic ozonation, in terms of color removal and reduction of chemical oxidation demand (COD) in rinsing effluents. COD removal efficiency in catalytic ozonation was enhanced by 25% when compared with that achieved by ozonation alone under the same treatment conditions. Moreover, we confirmed that after catalytic ozonation, the rinsing effluents could be recycled to replace fresh water without any evident compromise in the color quality of fabrics. The color difference (ΔEcmc(2:1)) between fabrics treated with recycled effluents and water was not more than 1.0, suggesting that the fabrics treated with recycled effluents displayed acceptable color reproducibility. Although colorfastness and color evenness of fabrics treated with recycled effluents were slightly poorer than those of fabrics treated with water, they were still within the acceptable tolerance. Therefore, the present study validated that catalytic ozonation was a promising technology for saving water and wastewater elimination in textile dyeing. It provides a feasibility assessment of catalytic ozonation for recycling waste effluents to reduce water dependence in textile production. Furthermore, we show a new perspective in on-site recycling waste effluents by catalytic ozonation and enrich the knowledge on feasible approaches for water management in textile production.

Recovery of resources from industrial wastewater employing electrochemical technologies: status, advancements and perspectives

“…Highly carcinogenic chlorine compounds identified in industrial effluents include highly carcinogenic dioxins, organic acids, and furan. They are mutagenic and bio-accumulative in plants and animals when exposed to their environmental condition [ 33 , 37 , 40 ]. Various treatment technologies are developed for the treatment of pollutants found in the water [ 41 ].…”

“…Depending on the chemical characteristics of metals and application requirements, EC techniques are classified as direct electrochemical reduction or free ion electrodialysis, electro-deionization, chelated ions by electrodialysis, less concentration wastewater by capacitive deionization, electrical switch ion exchange, parallel energy recovery by the bio-electrochemical system [ 15 , 91 ]. Recovering heavy metals like copper, neodymium, uranium, and direct ER of tellurium, improved by oscillating electrodes [ 14 , 40 , 92 ; 93 , 94 ]. Ammonium, zinc, cadmium, and nickel by bio- electrochemical and MFC technology [ 75 , 95 ].…”

PEG/Sodium Tripolyphosphate-Modified Chitosan/Activated Carbon Membrane for Rhodamine B Removal

“…With the development of the textile and dyestuff industries, the wastewater effluent without adequate treatment can cause significant environmental problems. , The wastewater containing harmful residual dyes and other auxiliary chemical additives causes irreversible damage to both living species and the aqueous environment. , For instance, the aquatic environment becomes unbalanced due to excessive proliferation of algae and suffocation of aquatic organisms under the influence of the dyeing effluent in a watercourse. , Therefore, efficient treatments to the residual pollutants in the wastewater, especially textile dyeing, must be performed before discharge. Rhodamine B (RhB) is a widely used organic colorant in textile and dyestuff industries .…”

Three-dimensional reduced graphene oxide aerogel stabilizes molybdenum trioxide with enhanced photocatalytic activity for dye degradation

“…Among these methods, adsorption method and photodegradation method are widely used in the purication of water pollution due to their convenience, high efficiency and economy, and they will not produce other harmful substances during the process of treatment and bring secondary pollution to the water body. 9,10 Specially, photocatalytic technology is an effective means to convert solar energy into chemical energy to generate clean energy and degrade pollutants in the environment. [9][10][11][12] Molybdenum trioxide (MoO 3 ) is an n-type semiconductor with good photochromic and electrochromic characteristics, which is suitable for various elds, including energy storage, gas sensing devices, catalytic applications and electrochemical devices.…”

“…9,10 Specially, photocatalytic technology is an effective means to convert solar energy into chemical energy to generate clean energy and degrade pollutants in the environment. [9][10][11][12] Molybdenum trioxide (MoO 3 ) is an n-type semiconductor with good photochromic and electrochromic characteristics, which is suitable for various elds, including energy storage, gas sensing devices, catalytic applications and electrochemical devices. [13][14][15][16] In recent years, MoO 3 has become a research object in the eld of photocatalysis due to its large specic surface area and electron transmission along the axis, etc., but the photocatalytic degradation ability of MoO 3 is limited due to its large band gap width and high photo-generated electron recombination rate.…”