Porous Eleocharis@MnPE Layered Hybrid for Synergistic Adsorption and Catalytic Biodegradation of Toxic Azo Dyes from Industrial Wastewater

Abstract

The effective treatment of industrial wastewater to protect freshwater reserves for the survival of life is a primary focus of current research. Herein, a multicomponent Eleocharis-manganese peroxidase enzyme (Eleocharis@ MnPE) layered hybrid with high surface area (1200 m 2 /m 3 ), with a strong synergistic adsorption and catalytic biodegradation (SACB), has been developed through a facile method. A combination of outer porous (Eleocharis) and inner catalytically active (MnPE) components of the hybrid resulted in highly efficient SACB system, evidenced by high removal rate of 15 kg m −3 day −1 (100%) and complete degradation of toxic Orange II (OR) azo dye into nontoxic products (gases and weak acids). The Eleocharis@MnPE layered hybrid efficiently degraded both OR in synthetic wastewater and also other azo dyes (red, pink, and yellow dyes) present in three different textile industrial effluents. For the industrial effluents, these were evidenced by the color disappearance and reduction in biological oxygen demand (BOD), chemical oxygen demand (COD), and total organic carbon (TOC) of up to 97%, 92%, and 76%, respectively. Furthermore, reduced toxicity of treated wastewater was confirmed by decreased cell toxicity to 0.1%−1% and increased cell viability to 90%. We believe that designing a hybrid system with strong ability of SACB could be highly effective for industrial-scale treatment of wastewater.

Synthesis of functional conjugated microporous polymer/TiO2 nanocomposites and the mechanism of the photocatalytic degradation of organic pollutants

“…As a major water pollutant, organic pollutants are insoluble organic matter, usually from the dye and intermediate production industries [2][3][4][5][6]. Due to the stable chemical structures of organic pollutants and their poor biodegradability, physical adsorption is considered to be one of the most effective methods for removing pollutants in various water treatment techniques [7][8][9]. However, after the adsorption process is complete, pollutants still exist and may cause secondary pollution [10].…”

Preparation and Characterization of PANI@NiO Visible Light Photocatalyst for Wastewater Treatment

“…Many catalysts have used to remove the organic dyes from water by using light. Most of the catalysts are based on semiconductor metal oxides, carbon‐based and polymers [5–9] . The catalysts are chosen based on their response to specific dyes.…”

Enhanced active oxidative species generation over Fe-doped defective TiO2 nanosheets for boosted photodegradation

“…With the rapid development of manufacturing and pharmaceutical industries, dyes and antibiotics from polluted water have attracted widespread attention in the eld of public health. [1][2][3][4] Commercial water disinfection strategies, such as physical adsorption and biodegradation, 5,6 have unavoidable side effects, which would increase treatment cost and environmental problems. Solar photocatalysis technology uses highly active oxidative species (AOS) produced by semiconductors to drive the degradation of antibiotics and dye molecules, showing unique advantages and broad application prospects in water purication.…”