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The (partial) replacement of synthetic polymers with bioplastics is due to increased production of conventional packaging plastics causing for severe environmental pollution with plastics waste. The bioplastics, however, represent complex mixtures of known and unknown (bio)polymers, fillers, plasticizers, stabilizers, flame retardant, pigments, antioxidants, hydrophobic polymers such as poly(lactic acid), polyethylene, polyesters, glycol, or poly(butylene succinate), and little is known of their chemical safety for both the environment and the human health. Polymerization reactions of bioplastics can produce no intentionally added chemicals to the bulk material, which could be toxic, as well. When polymers are used to food packing, then the latter chemicals could also migrate from the polymer to food. This fact compromises the safety for consumers, as well. The scarce data on chemical safety of bioplastics makes a gap in knowledge of their toxicity to humans and environment. Thus, development of exact analytical protocols for determining chemicals of bioplastics in environmental and food samples as well as packing polymers can only provide warrant for reliable conclusive evidence of their safety for both the human health and the environment. The task is compulsory according to legislation Directives valid to environmental protection, food control, and assessment of the risk to human health. The quantitative and structural determination of analytes is primary research task of analysis of polymers. The methods of mass spectrometry are fruitfully used for these purposes. Methodological development of exact analytical mass spectrometric tools for reliable structural analysis of bioplastics only guarantees their safety, efficacy, and quality to both humans and environment. This study, first, highlights innovative stochastic dynamics equations processing exactly mass spectrometric measurands and, thus, producing exact analyte quantification and 3D molecular and electronic structural analyses. There are determined synthetic polymers such as poly(ethylenglycol), poly(propylene glycol), and polyisoprene as well as biopolymers in bags for foodstuffs made from renewable cellulose and starch, and containing, in total within the 20,416–17,495 chemicals per sample of the composite biopolymers. Advantages of complementary employment in mass spectrometric methods and Fourier transform infrared spectroscopy is highlighted. The study utilizes ultra-high resolution electrospray ionization mass spectrometric and Fourier transform infrared spectroscopic data on biodegradable plastics bags for foodstuffs; high accuracy quantum chemical static methods, molecular dynamics; and chemometrics. There is achieved method performance |r| = 0.99981 determining poly(propylene glycol) in bag for foodstuff containing 20,416 species and using stochastic dynamics mass spectrometric formulas. The results highlight their great capability and applicability to the analytical science as well as relevance to both the fundamental research and to the industry.
Cellulosic nanomaterials for adsorption of emerging pollutants
Vol 5, Issue 1, 2024
Issue release: 30 June 2024
VIEWS - 4072 (Abstract)
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Abstract
Context: At present, nanotechnology can be used in multiple areas of action which, due to its nature, can be implemented with great versatility, given that many advances in nanotechnology base their studies on how to optimize daily and industrial processes and how to favor the environment. In addition, the manipulation of matter at this level allows the creation of solutions with greater scientific, social and economic impact. For the purposes of this research, laboratory results will be shown using cellulosic nanomaterials for the adsorption of emerging antibiotic-type contaminants. Method: This research was carried out at laboratory level, where cellulose was modified by chemical methods to obtain nanocellulose by oxidation. A characterization of the material obtained by spectroscopy techniques was carried out, and the adsorption of emerging anti-biotic contaminants such as ciprofloxacin. Results: Cellulosic nanomaterials have the potential to be used in tertiary water treatment for the removal of emerging contaminants such as ciprofloxacin. The results show that the cellulosic nanomaterial adsorbs ciprofloxacin by 27 %. Conclusions: Nanocellulose membranes have potential for use in a water purification system; those made only with cellulose showed a lower percentage of contaminant adsorption than membranes with nanocellulose.
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References
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Prof. Hongxing Dai
Beijing University of Technology, China
