Against the backdrop of “carbon neutrality”, the green treatment of dye wastewater is particularly important. Currently, the adsorption method shows strong application prospects. Therefore, selecting ...efficient and recyclable adsorbents is of significant importance. TiO2 is an excellent adsorbent, but its difficult recovery often leads to secondary pollution. γ-Fe2O3-modified coal-series kaolin exhibits both excellent adsorption properties and rapid separation through magnetic separation technology. By utilizing the synergistic effects of both, TiO2/-γFe2O3 coal-series kaolin, magnetic adsorbent regeneration materials were prepared using coprecipitation method and characterized. The influencing factors of this functional material on the adsorption of Congo red dye and its regeneration performance are discussed. The experimental results indicated that the specific surface area, pore volume and Ms value of this functional material are 127.5 m2/g, 0.38 cm3/g, and 13.4 emu/g, respectively. It exhibits excellent adsorption characteristics towards Congo red, with an adsorption rate reaching 96.8% within 10 min, conforming to the pseudo-second-order kinetic model, and demonstrating Langmuir IV-type monolayer adsorption. After the adsorption of Congo red, magnetic separation shows superior efficiency. Furthermore, treatment of the adsorbed composite with EDTA allows for recycling, with adsorption rates still above 91% after three cycles, indicating an excellent regeneration capability.
Copolymerisation of a sorbitol‐derived bis‐carbonate with simple diamines, including cadaverine that was sustainably produced from lysine, under solvent‐free conditions was shown to produce rigid ...foams. Thermogravimetric analysis carried out in tandem with infrared spectroscopy of the released gases confirmed that the foaming agent was carbon dioxide produced during the polymerisation process itself. Such a bio‐based foam, being made under mild conditions from stable, benign precursors, with no toxic isocyanates, has great potential application for both thermal insulation and packaging.
A bis‐carbonate derived from sorbitol, which is both non‐toxic and bio‐derived, and pentamethylene diamine produced by the decarboxylation of lysine, are polymerised to form a polyhydroxyurethane. The polymerisation releases carbon dioxide, resulting in a sustainable self‐foaming material made entirely without the use of isocyanates or blowing agents.
Review of nanocellulose for sustainable future materials Kim, Joo-Hyung; Shim, Bong Sup; Kim, Heung Soo ...
International journal of precision engineering and manufacturing-green technology,
04/2015, Letnik:
2, Številka:
2
Journal Article
Odprti dostop
Cellulose, the chain of glucose residues easily obtained from nature, is the most common natural polymer. Owing to its own unique material properties, compared to the conventional usage, ...nanocellulose (NC) with a crystalline structure can be considered to be used in various industrial applications. As a novel sustainable future material, we review the recent achievements of NC from the view point of material extraction and the composite processes to some extended important applications. While the mechanical properties of NCs and the energy consumption during their composite processing are the key considerations, their application potentials have never been limited to mechanical or commodity products as conventional celluloses. In the latter part of this review, emerging engineering applications of NCs such as energy storage, flexible electronics, and smart materials will be further discussed for readers searching future high-end eco-friendly functional materials. Also some suggestions for potential applications will be also discussed.
The mechanical properties and water resistance of castor oil-based waterborne polyurethane are mutually limited due to the presence of a hydrophilic chain extender. Herein, Arbutin (AT) was used as a ...crosslinking agent, and benzimidazole (CR-455) was utilized as an ultraviolet absorber, sustainable long fatty hydrophobic chain extenders, sorbitan monooleate (SP), glycerol laurate (GML), glycerin monostearate (GMS), and trimethylolpropane monooleate (TPM), were introduced into castor oil-based waterborne polyurethane (CWPU) backbones through molecular structure design respectively. Subsequently, the amount of SP was changed to prepare a series of waterborne polyurethane dispersions, and their emulsion and film properties were thoroughly investigated. The finding showed that the incorporation of long fatty hydrophobic chain extenders led to an increase in crosslinking density, thereby endowing CWPU films with good mechanical properties, water resistance, and anti-corrosion efficacy. Moreover, the bio-based content in the CWPU film had reached an impressive 90.9 %. The addition of SP content resulted in a gradual improvement in the mechanical properties, water resistance, and corrosion resistance of CWPU-SP films. When the SP content was 40 %, due to the high strength of hydrogen bonds and the density of crosslinking in systems, the tensile strength, toughness, water absorption rate, and corrosion protection efficiency of the CWPU-SP40 film reached 18.1 MPa, 20 MJ/m3,7.7 %, and 98.47 %, respectively. Particularly, the prepared transparent CWPU films exhibited complete UV shielding. This work would pave the way for the application of bio-based waterborne polyurethanes in high-performance coatings, such as anti-corrosion and sunscreen.
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•A novel multifunctional highly crosslinked bio-based WPU networks were successfully prepared.•Various types of long fatty hydrophobic chain extenders were incorporated into the molecular chain of bio-based WPU.•The bio-based WPU films showed the mechanical performance and water resistance.•The prepared bio-based WPU films possessed good UV resistance and corrosion resistance.
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•Fractionation of lignin from rice bran using acid pre-treatment process.•Extraction of cellulose fibers from rice bran using alkali bleaching process.•Characterization of lignin ...fraction by UV, FTIR, and MALDI-TOF-MS analysis·•Changes of biomass surface analysis by SEM, XRD, FTIR and XPS.
Cellulose and lignin were simultaneously isolated from rice bran is an interesting and alternative renewable materials synthesis for industrial application. In the present research, acid pre-treatment (AT) (85 % organic acid, 80 °C, 120 min) has been proposed for the fractionation of lignin from rice bran (RB). After end of the pre-treatment, residual RB was further submitted to bleaching treatment (BT) (1.7 % sodium chlorite, 60 °C, 120 min) for fractionation of cellulose fibres. The isolated lignin structure was extensively characterized using UV–vis spectroscopy, Fourier-transform infrared spectroscopy (FT-IR) and matrix assisted laser desorption/ionisation-time of flight-mass spectrometry (MALDI-TOF-MS). In addition, surface morphology and surface elemental composition of untreated rice bran (UT-RB), acid treated rice bran (AT-RB) and bleaching treatment rice bran (BT-RB) were performed by X-ray photoelectron spectroscopy (XPS), SEM, XRD and FTIR. Fractionated lignin and cellulose fibres could be used as feedstock in the integrated biorefineries application.
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•Cassava starch and bagasse based biocomposites were used as urea release-systems.•Plant growth morphological parameters of tomato seedlings was evaluated.•Photosynthetic pigments ...content and nitrogen status in the plant was assessed.•An ecofriendly, efficient and simple urea dosage alternative system was developed.
One of the main problems caused by intensive agriculture, is the consequent water pollution resulting from fertilizer leaching, especially as a result of fertilizers overuse. Therefore, in the present study an evaluation of the efficiency of different urea controlled-release systems, based on cassava starch and bagasse, over tomato plants growth was carried out. All fertilized systems showed a tendency towards a greater general development, photosynthetic pigments content and nitrogen status of the plant. However, significant differences were observed regarding macronutrient dosage, being unsupported biocomposite films with 25 wt.% urea content the systems with a better performance. Thus, an ecofriendly, efficient and easy to implement urea dosage alternative system for greenhouse seedling has been developed.
The development and implementation of renewable materials for the production of versatile chemical resources have gained considerable attention recently, as this offers an alternative to the ...environmental problems caused by the petroleum industry and the limited supply of fossil resources. Therefore, the concept of utilizing biomass or wastes from agricultural and industrial residues to produce useful chemical products has been widely accepted. Lactic acid plays an important role due to its versatile application in the food, medical, and cosmetics industries and as a potential raw material for the manufacture of biodegradable plastics. Currently, the fermentative production of optically pure lactic acid has increased because of the prospects of environmental friendliness and cost-effectiveness. In order to produce lactic acid with high yield and optical purity, many studies focus on wild microorganisms and metabolically engineered strains. This article reviews the most recent advances in the biotechnological production of lactic acid mainly by lactic acid bacteria, and discusses the feasibility and potential of various processes.
•Using renewable materials in replacement of bitumen implies environmental benefits.•Fundamental requirements that renewable materials must possess are highlighted.•The effects on performance, ...environment and human health are discussed.•The results available are promising but suggestions for future work are provided.•A comprehensive experimental approach is proposed.
Bitumen is the most employed binder in road pavements and derives from petroleum, which is a non-renewable resource that is progressively depleting. Therefore, the current challenge for road industry is to use renewable materials (i.e. bio-materials not subjected to depletion) in partial replacement of bitumen, thus reducing carbon footprint and making the sector less dependent on petroleum-based products. Specifically, the trend is to utilize bio-materials that are obtained as by-products from industrial processes or as wastes from the everyday life, avoiding their disposal in landfills, in accordance with the principles of sustainability and circular economy. Thus, research in this field is very promising and attractive nowadays. However, in order to understand whether the application of renewable materials represents a reliable and viable solution or just a speculative pretext for research, a rigorous scientific approach must be adopted. For this purpose, the paper provides an overview of the use of renewable materials in bituminous binders and mixtures, focusing on the necessary requirements that they should meet, their effects on performance, and health, safety and environment aspects. Based on the analysis of available literature, a comprehensive experimental approach for evaluating bio-materials in bituminous applications is also proposed.
In recent years, the shortcomings of products bonded with adhesives of conventional resins (e.g. urea-formaldehyde, phenolics-based resins, melamine-based) have raised concerns as people have become ...more environmentally conscious while fossil resources are in short supply. This has prompted researchers to develop a new generation of adhesives derived from natural renewable biomass resources, with excellent properties and no or limited contamination. In this study, a novel epoxidized tannin-based non-isocyanate polyurea adhesive was prepared from natural tannin after functionalization with epichlorhydrin. The structure, molecular weight, and thermal degradation behavior of this resin adhesive synthesized in this way, were investigated using FT-IR, ESI-MS, GPC, and TGA, respectively. The mechanical properties and water resistance of the produced plywood were evaluated. It was found that the adhesive possess ideal bonding strength and excellent water resistance, and the prepared plywood can have potential application prospects under harsh conditions.
•Epoxidized tannins can be simply obtained via reaction with epichlorohydrin..•A novel non-isocyanate polyurea adhesive based on epoxidized tannin was developed.•These developed polyurea adhesives exhibited excellent water resistance.•It opens the door for extension of tannin adhesives formulationsin exterior applications.
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