Abstract
In this study, polyacrylic acid modified filter paper (FP/PAA) was synthesized by in-situ polymerization of acrylic acid, which was used as a matrix to chelate nano-scale zero valent iron (nZVI). The loading content of nZVI in the filter paper reached 24.8%. The fabricated composite FP/PAA/nZVI was characterized by SEM, FT-IR and TGA respectively. Moreover, it was used for the removal of methyl blue and methylene blue as model anionic and cationic dyes. The effect of initial dye concentration on decolorization efficiency was investigated. The results showed that FP/PAA/nZVI enhanced the removal of dye from the simulated dye wastewater and the decolorization efficiency exceeded 95% for the dye solutions lower than 20 mg/L. More importantly, the filter paper supported nZVI realized the continuous treatment of simulated dye wastewater by a simple filtration process. This study hopes to serve as a basis for the application of nZVI in textile wastewater treatment.
Highlights
In the textile dyeing industry, untreated dye wastewater undoubtedly causes serious environmental problems and deteriorates groundwater quality, which is associated with the health of human and other creatures
The surface morphology of Filter paper (FP), FP/polyacrylic acid (PAA) and FP/PAA/nano-scale zero valent iron (nZVI) were observed with FESEM, as shown in Fig. 1, original FP presents a porous microstructure and smooth surface in microfibers, which is similar to the morphology of FP/PAA
The Acrylic acid (AA) aqueous solution can infiltrate the FP very well, resulting in a homogeneous FP/PAA matrix and surface, which is beneficial to the subsequent immobilization of nZVI
Summary
In the textile dyeing industry, untreated dye wastewater undoubtedly causes serious environmental problems and deteriorates groundwater quality, which is associated with the health of human and other creatures. Some methods, including flocculation[1], fenton oxidation[2], membrane filtration[3], adsorption[4], photochemical[5,6,7], ion exchange[8], electrochemical oxidation[9] and electrolytic precipitation[10], had been used for the treatment of dye wastewater. FP embedded with silver nanoparticle[37], copper nanoparticle[38], gold nanoparticle[39], titanium dioxide particle[40] and nZVI41 had been fabricated for water treatment, dye removal, reaction monitoring and water-oil separation, respectively. NZVI was embedded in polyacrylic acid modified FP (FP/PAA) by a simple procedure and was proposed for dye (including methyl blue and methylene blue) decoloration. The study realized the consecutive treatment of dyeing wastewater and is valuable for industrial application
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