Synthesis and application of green mixed-metal oxide nano-composite materials from solid waste for dye degradation
Journal
Journal of Environmental Management
Journal Volume
181
Pages
146-156
Date Issued
2016
Author(s)
Abstract
Present study demonstrates reutilization of electrochemical (EC) sludge as a potential low-cost green catalyst for dye degradation. Hexagonal Fe2O3 type phase with trevorite (NiFe2O4)-type cubic phase nanocomposite material (NCM) was synthesized from solid waste sludge generated during EC treatment of textile industry wastewater with stainless steel electrode. For NCM synthesis, sludge was heated at different temperatures under controlled condition. Various synthesized NCMs were characterized by powder X-ray diffraction (PXD), energy dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. The synthesized NCMs were found to contain iron, chromium, nickel and oxygen in the form of α-Fe2O3 (metal: oxygen = 40:60), (Fe,Cr,Ni)2O3 and trevorite NiFe2O4, (Ni,Fe,Cr) (Fe,Cr,Ni)2O4 (metal: oxygen = 43:57). Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), pore size distribution, and atomic force microscope (AFM) analysis showed distribution of grains of different shapes and sizes. Catalytic activity of NCM was studied by the methylene red dye degradation by using the catalytic wet peroxidation process. Zeta potential study was performed under different pH so as to determine the performance of the NCMs during dye degradation. © 2016 Elsevier Ltd.
Subjects
Catalytic activity; Electrochemical sludge; Fe2O3; NCMs; Zeta potential
Other Subjects
carbene; chromium; dye; iron; iron oxide; nanocomposite; nickel; oxygen; stainless steel; coloring agent; ferric ion; nanocomposite; oxide; pollutant; sewage; waste water; catalysis; catalyst; colloid; degradation; dye; electrochemical method; electrode; electrokinesis; industrial waste; iron oxide; nanoparticle; sludge; solid waste; textile industry; wastewater; Article; atomic force microscope; atomic force microscopy; catalyst; comparative study; degradation; electrochemical sludge; electrode; energy dispersive X ray spectroscopy; field emission scanning electron microscopy; heating; peroxidation; pH; sludge; solid waste; spectroscopy; synthesis; temperature; textile industry; transmission electron microscopy; waste water; waste water management; X ray diffraction; X ray photoelectron spectroscopy; zeta potential; analysis; catalysis; chemistry; pollutant; scanning electron microscopy; sewage; textile industry; Catalysis; Chromium; Coloring Agents; Environmental Pollutants; Ferric Compounds; Iron; Microscopy, Electron, Scanning; Nanocomposites; Nickel; Oxides; Photoelectron Spectroscopy; Sewage; Textile Industry; Waste Water; X-Ray Diffraction
Type
journal article