Khadiga Mohamed Abas, Miroslav Mrlik, Katarína Mosnáčková, Jaroslav Mosnáček
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引用次数: 0
Abstract
New adsorbent films for the biosorption of malachite green (MG) dye from water were prepared using polylactic acid (PLA) as a renewable, degradable and thermoplastic polymer matrix, instead of widely used crosslinked systems. Polyaniline (PANI) and carbon fibers (CFs) were added to PLA through vigorous sonication followed by a casting technique to create electrically conductive PLA-based adsorbent films with enhanced functionality and adsorption properties. The composite films were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical thermal analysis, and BET-surface area measurements to identify their functionality as adsorbents for removing MG dye from water. The produced PLA/PANI/CFs composite films exhibited higher electrical conductivity and surface area compared to PLA and PLA/PANI films. The effects of adsorbent film composition, contact time, pH, and dye concentration on adsorption efficiency were assessed. The adsorption test confirmed effective removal of MG dye with maximum adsorption capacities of up to 60.1 mg/g. The isotherm data fitted the Langmuir model with an R2 value of 0.99, implying a chemisorption process. The fabricated biosorbents disclosed the first-order kinetic model with high R2 values and an exothermic reaction with the MG dye, as the process is stimulated by a decrease in temperature. Adsorbent regeneration and the significant effect of various MG concentrations on electric conductivity, which changed by two orders of magnitude, demonstrated the applicability of PLA/PANI/CFs composite films as potential MG dye sensors.
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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