Statistical modeling and optimization of heterogeneous Fenton-like removal of organic pollutant using fibrous catalysts: a full factorial design

Abstract

This work focuses on the optimization of heterogeneous Fenton-like removal of organic pollutant (dye) from water using newly developed fibrous catalysts based on a full factorial experimental design. This study aims to approximate the feasibility of heterogeneous Fenton-like removal process and optionally make predictions from this approximation in a form of statistical modeling. The fibrous catalysts were prepared by dispersing zerovalent iron nanoparticles on polyester fabrics (PET) before and after incorporation of either polyamidoamine (PAMAM, –NH2) dendrimer, 3-(aminopropyl) triethoxysilane (APTES, –Si–NH2) or thioglycerol (SH). The individual effect of two main factors [pH (X1) and concentration of hydrogen peroxide-[H2O2]μl (X2)] and their interactional effects on the removal process was determined at 95% confidence level by an L27 design. The results indicated that increasing the pH over 5 decreases the dye removal efficiency whereas the rise in [H2O2]μl until equilibrium point increases it. The principal effect of the type of catalysts (PET–NH2–Fe, PET–Si–NH2–Fe, and PET–SH–Fe) did not show any statistical significance. The factorial experiments demonstrated the existence of a significant synergistic interaction effect between the pH and [H2O2]μl as expressed by the values of the coefficient of interactions and analysis of variance (ANOVA). Finally, the functionalization of the resultant fibrous catalysts was validated by electrokinetic and X-ray photoelectron spectroscopy analysis. The optimization made from this study are of great importance for rational design and scaling up of fibrous catalyst for green chemistry and environmental applications.

Immobilizing Redox Enzyme on Amino Functional Group-Integrated Tailor-Made Polyester Textile: High Loading, Stability, and Application in a Bio-Fenton System

“…The automatic data collection panel of a Theta optical tensiometer records and analyzes the water drop using One Attension software as per the Young–Laplace equation . Electrokinetic measurements using the streaming potential were carried out through a SurPASS electrokinetic analyzer (Anton Paar AB, Sweden) according to the method explained in our previous study . X-ray photoelectron spectroscopy (XPS) study was carried out using a spectrophotometer (PHI 5500 ESCA, Physical Electronics Inc., USA) equipped with a monochromatic aluminum (Al) source (photon energy = 1486.6 eV) according to the method described elsewhere. − Fourier transform infrared (FTIR) chemical analysis of the pristine and modified PFs was performed using an FTIR spectrometer (Nicolet iS10, Thermo Fisher Scientific Co., USA).…”

Recent Achievements in Dyes Removal Focused on Advanced Oxidation Processes Integrated with Biological Methods

“…Fenton-like heterogenous catalysts enabling dye degradation in a wide range of pH, among the others zero-valent iron catalysts, green or one-spot synthesis of catalysts, fixed bed reactor application, implementation of sulphate radical anions [92][93][94][95][96] Photo-Fenton…”

Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

“…Textile dyeing and nishing industries are considered one of the greatest industrial polluters because they discharge a large amount of wastewater containing harmful dyes affecting the environment and human life. 1,2 In this regard, over the past several years, technologies such as adsorption, 3,4 Fenton catalytic systems, 5,6 and membranes [7][8][9] have been applied to treat these complex wastewater effluents; however, these methods are still questionable in terms of sustainable development in the textile industry. Therefore, waterless dyeings, such as dyeing in supercritical uid, [10][11][12] silicone oil, [13][14][15][16][17] liquid paraffin oil, [18][19][20] plant oil, 21,22 and ethanol, 23,24 have been studied as an example of a cleaner dyeing method to reduce water pollution.…”