Self‐assembly of alginate/polyethyleneimine multilayer onto magnetic microspheres as an effective adsorbent for removal of anionic dyes

Abstract

A novel magnetic adsorbent alginate/polyethyleneimine (ALG/PEI)n/MN was developed for removal of anionic dyes from aqueous solution in this study. (ALG/PEI)n/MN was prepared by depositing ALG/PEI multi‐layers onto amine‐modified Fe3O4 microspheres through layer‐by‐layer method. The morphologies and structures of the adsorbent were characterized by scanning electron microscopy, X‐ray diffractometer, and Fourier transform infrared spectrometer, respectively, and its performance in adsorption of anionic dye (acid orange 10, AO10) under varied experimental conditions were also investigated. The results revealed that the uptake capacity of AO10 by (ALG/PEI)n/MN increased with the number of coated (ALG/PEI) bilayer on the adsorbents, and the maximum adsorption capacity for AO10 by (ALG/PEI)4MN was 246.3 mg g−1 at 25 °C. The adsorption process was exothermic and well described by the pseudo‐second order kinetic model and the Langmuir isothermal model. Moreover, (ALG/PEI)4/MN showed good reusability and excellent magnetic separability. All the results demonstrate that (ALG/PEI)4/MN is a potential recyclable adsorbent for removal of anionic dyes from wastewater. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45876.

Smart Adsorbents for Aquatic Environmental Remediation

“…An innovative magnetic alginate/polyethyleneimine (ALG/ PEI) n /MN was synthesized by deposition of ALG/PEI multilayers onto amine-modified Fe 3 O 4 microspheres (MN) by the layer-by-layer (LbL) methodology for acid orange 10 (AO10) adsorption. [190] The larger the number of coated (ALG/PEI) bilayers, the better the (ALG/PEI) n /MN performance, displaying 246 mg g −1 as maximum adsorption of AO10 (T = 298 K). [190] An ionic cryogel was synthesized by crosslinking polymerization of 2-acrylamido-2-methylpropane sulfonate sodium salt and styrene sulfonate sodium salt.…”

“…[190] The larger the number of coated (ALG/PEI) bilayers, the better the (ALG/PEI) n /MN performance, displaying 246 mg g −1 as maximum adsorption of AO10 (T = 298 K). [190] An ionic cryogel was synthesized by crosslinking polymerization of 2-acrylamido-2-methylpropane sulfonate sodium salt and styrene sulfonate sodium salt. (magnetic saturation, M s : 12 emu g −1 ), which displayed a MB removal capacity of 833 mg g −1 , maintaining magnetic characteristics and efficiency for six cycles under regeneration with methanol/ammonia.…”

Portable Microalgal Biosensor for Herbicide Monitoring

“…Different negatively charged ions and enzymes have been incorporated in this system (ferrocyanide, laccase, glucose oxidase), and different strategies were used to enhance the signal generation (multiwall carbon nanotubes, gold nanoparticles) producing in all cases an excellent response and stability . On the other hand, microalgae and alginate are negatively charged, and their adsorption on different surfaces is currently studied …”

Fe/Mn oxide decorated polyacrylonitrile hollow fiber membrane as heterogeneous Fenton reactor for methylene blue decolorization

“…Large quantities of dyes have been used in textile and printing industries, which have been regarded as one of the main causes of a large amount of dye‐contaminated water . Aforementioned wastewater is characterized by high toxicity, carcinogenic effect, and overall recalcitrance to biodegradation .…”