Polyethylene terephthalate (PET) recycling: A review

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 9, P. 100673 - 100673

Published: Feb. 23, 2024

It is difficult to reuse wastes from polymers due the mismatch between amount of contaminants and secondary quality feed. This type operation much more expensive cost-effective than production polymer raw materials latest materials. However, recyclable beneficial if used extensively in various concrete products wood-polymer boards. done only cleaning sorting are not particularly important for products. Polyethylene terephthalate (PET) a widely industries its excellent physical chemical properties. Besides, increasing use PET has led global crisis waste management, as improper disposal caused significant environmental damage. major source accumulated landfills, address this issue, recycling methods have evolved. In regard, present review examines techniques involved PET. Conventional influence diverse depolymerization reaction variables were discussed, upsides downsides each technique considered. The summarizes advances technologies plastic waste, focusing on bio-recycling PET, aiming sustainable, economical solutions circular economy.

Language: Английский

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Nano titanium oxide (nano-TiO2): A review of synthesis methods, properties, and applications

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 9, P. 100626 - 100626

Published: Jan. 24, 2024

Nanoparticles have revolutioned materials secience and manufacturing industry thanks to their ultrafine scale. Nano-scale titanium oxide (nano-TiO2) are key elements of a wide variety sectors advanced materials, devices, systems in view versatility extraordinary characetristics, mainly optical, electrical catalytic properties. Thnaks aforementioned features, they found position different industries such as colors pigments, photocatalysts, photovoltaic solar cells, adsorbents, cosmetics, electric electronic devices. Nano-SiO2 application gives rise range properties performance, which severely depends on particle size, size distribution, agglomeration the bulk host or systems. When used surface coating additive even functionalized, nano- TiO2 takes more roles, state-of-the-art depending synthesis method. Therefore, review synthesis, properties, surface- bulk-functionalization/modification (respectively with function groups doping) methods achieving high-performance seems essential. In this review, background information developments from pure Titanium Oxide chemically modified -based photocatalysts were discussed detail, Photocatalytic activity oxide-based nitrogen group pollutant decomposition. It also Vehicle for Chemotherapeutics Other Applications Medicine an overview factors affecting been reviewed.

Language: Английский

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Adsorption of heavy metal ions use chitosan/graphene nanocomposites: A review study

Results in Chemistry, Journal Year: 2024, Volume and Issue: 7, P. 101332 - 101332

Published: Jan. 1, 2024

The emission of heavy metals in the environment has caused many problems world due to industrialization society and expansion urbanization. Environmental pollution, including greenhouse gases water-soluble toxic pollutants, is a major concern around world. One most important issues protecting health humans, animals plants cleanliness water. Water substance vital for all living things on planet. can be treated several ways, such as desalination, purification, osmosis, disinfection, deposition contaminants. Among these methods, adsorption method advantages over other methods. surface phenomenon during which contaminants are adsorbed adsorbent with physical forces depends factors temperature, pH, concentration contaminants, time phase contact particle size temperature nature pollutants adsorption. Chitosan received widespread attention an because its low cost great potentials. abundant hydroxyl amino groups that bind metal ions. However, it defects sensitivity thermal stability, mechanical strength, limit application chitosan wastewater treatment. functional modified improve performance via crosslinking graft modification. porosity specific area powder form not ideal, therefore, modification been attempted generate nanoparticles hydrogel. also integrated materials (e.g. graphene, zeolite) resulting composite improved performance. This review mainly focuses reports about derivatives remove different metals. preparation strategy, mechanism, affecting adsorbents each type discussed detail. Recent organic (dyes phenol) removal by briefly discussed.

Language: Английский

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Adsorption of heavy metals from wastewater by chitosan: A review

Results in Engineering, Journal Year: 2024, Volume and Issue: 23, P. 102404 - 102404

Published: June 14, 2024

With the progress of human civilization, development technology and increasing population, world is currently facing an important problem called pollution, which threatens lives inhabitants planet, so that in every country, environmental protection a serious concern statesmen. Pollution caused by accumulation soil water from persistent toxic compounds such as chemicals, salts, heavy metals radioactive substances are causes diseases have inconsistent effects on growth health animals humans. The release environment due to industrialization expansion urbanization has brought great problems all over world, increase pollution concerns their carcinogenic properties, indestructibility biological accumulation. Adsorption industrial effluents one issues. So far, various methods been considered for adsorption these metals, use methods. There natural synthetic adsorption, each specific advantages, recently chitosan also composites used. Being economical terms economy, easy access compliance with standards among advantages method. In this study, basis performance, disadvantages different finally adsorbent nanofibers discussed.

Language: Английский

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Effect and investigating of graphene nanoparticles on mechanical, physical properties of polylactic acid polymer

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 9, P. 100612 - 100612

Published: Jan. 11, 2024

Polylactic acid (PLA) is a linear aliphatic polyester thermoplastic made from renewable sources such as sugar beet and cornstarch. Methods of preparation polylactic are biological chemical. The advantages biocompatibility, easily processing, low energy loss, transparency, high strength, resistance to water fat penetration consumption carbon dioxide during production. However, has disadvantages hydrophobicity, fragility at room temperature, thermal resistance, slow degradation rate, permeability gases, lack active groups chemical neutrality. To overcome the limitations acid, stability inability absorb nanoparticles graphene added improve its properties. Samples were prepared by solution casting method using chloroform solvent in thin films. mechanical, thermal, structural properties pure acid/graphene nanocomposites studied tensile Test X-ray diffraction (XRD), Root mean square (RMS) Differential Scanning Calorimetry (DSC). Also, exposing samples Ultraviolet (UV) rays then performing test, produced against was investigated. With above tests, it found that adding crystallinity decreases strength elongation particles (0.4% graphene) increase certain extent decrease. loss modulus storage also increased addition nanoparticles. By comparing exposed with other samples, significant decrease elasticity observed. In words, make brittle.

Language: Английский

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Carbon-doped titanium dioxide (TiO2) as Li-ion battery electrode: Synthesis, characterization, and performance

Results in Chemistry, Journal Year: 2024, Volume and Issue: 7, P. 101422 - 101422

Published: Jan. 1, 2024

Development of lithium-ion batteries (Li-ion batteries) with high safety and solidity features has become a main challenge researchers when practical implementations for large-scale energy storage systems are prioritized. In this work, we introduce useful efficient strategy to manufacture long-standing high-rate carbon-doped TiO2 (C-TiO2) as an anode material. Titanium (TiO2) C-TiO2 were successfully prepared through hydrothermal method in order improve the electrical performance Li-battery. The structure thermal properties investigated by XRD, Raman TGA; whereas evaluated Glvanostatic discharge–charge measurements. density function theory (DFT) results revealed that doped carbon atoms causes considerable stress inside crystal lattice TiO2, avoid or minimize underwent relaxation then optimized. electrodes Li-battery was analyzed 100 cycles at different calcination temperatures 400 450 °C. also showed charge capacities 500 mAhg−1 mAg−1.

Language: Английский

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Nano bioceramics: Properties, applications, hydroxyapatite, nanohydroxyapatite and drug delivery

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 10, P. 100869 - 100869

Published: July 29, 2024

Bone is the second organ of human body that has most transplants. The concept bone repair evolved over past five decades and known as third generation biomaterials. During integration nanotechnology with bioceramics, an emerging research field called nanobioceramics been born within Due to chemical similarity mineral content bone, are included in definition a new biomaterials whose main purpose create microenvironment improve cellular responses leading osteogenesis. Hydroxyapatite member calcium phosphate family. This substance, which bioactive biocompatible compound, considered component tissue. structural this compound it widely used tissue dental orthopedic applications. Many basic properties hydroxyapatite can be improved by changing scale its particles nanoparticles. Therefore, recent years, various methods for synthesis nanohydroxyapatite have reported. Using different characterization methods, quality synthesized nanostructures checked. In addition bone-related fields, also carrier transfer materials, including drugs, vitamins, proteins. article, modern times, advances biomedical focusing on use bioceramics treatment diseases, function vital organs, engineering brought hopes regenerative medicine. Various being investigated synthesize bioceramic materials using natural synthetic materials. There several challenges enable cost-effective material minimize rejection biological systems. One major incorporating foreign into systems their acceptance reduce humans other organisms studying immune responses. When developing ceramic mechanical one important parameters humans. evaluation criteria mechanical, existing approaches play crucial role validating bioceramics. State-of-the-art techniques

Language: Английский

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Copper and nickel doped carbon dots for rapid and sensitive fluorescent turn-off detection of bilirubin

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 8, 2025

Carbon dots doped with metals and non-metals have gained much popularity due to the enhancement in their optical electronic properties. In this study, polyethyleneimine-functionalized transition metal (nickel or copper) carbon (CD, NiCD CuCD) were synthesized through hydrothermal method. The exhibited a blue fluorescence at 470 nm when excited 350 nm. as-synthesized utilised for fluorimetric detection of bilirubin range 0.5 µM – 280 µM, CuCD exhibiting highest sensitivity 155.38 a.u/log concentration 10 84.01 a.u/ log µM. also lowest limit 0.0907 quantification 0.3023 All showed negligible interference presence biomolecules ions present human serum implying remarkable selectivity method detection. Further, successfully tested real-time application using bilirubin-spiked samples.

Language: Английский

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Graphene oxide-based biosensors for detection of lung cancer: A review

Results in Chemistry, Journal Year: 2023, Volume and Issue: 7, P. 101300 - 101300

Published: Dec. 31, 2023

Lung cancer is one of the most common diseases worldwide today and has highest mortality rate among cancers. Therefore, early diagnosis this disease special importance. Due to fact that methods for detecting lung are costly time-consuming, providing cheaper faster received attention. With significant development nanotechnology in recent years various nanomaterials, activities have been carried out field. Recent studies show graphene oxide due their unique properties, a high potential design biosensors detect cancer.

Language: Английский

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Novel nanocomposite zinc phosphate/ polyvinyl alcohol / carboxymethyl cellulose: Synthesis, characterization and investigation of antibacterial and anticorrosive properties

Case Studies in Chemical and Environmental Engineering, Journal Year: 2023, Volume and Issue: 9, P. 100591 - 100591

Published: Dec. 23, 2023

in this paper, two novel Composites zinc phosphate/Polyvinyl alcohol (ZnP-PVA) and Zinc Phosphate/Polyvinyl alcohol/Carboxymethyl cellulose (ZnP-PVA/CMC) had been synthesized by a low-temperature one-step ultrasonic-template assisted route. For characterization of samples, Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Transmission (TEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive X-Ray Analysis (EDAX), MIC/MBC EIS were used. FTIR spectra the composite confirmed functional groups present PVA/CMC/Zn2+ ions infraction also SEM TEM images showed composites have layered structure with rectangular microcrystals (2.8 mm width ZnP-PVA was able 100% to completely remove bacteria tested sample. As results show, Anti-corrosion efficiency inhibitor is 92.8% at 2 h, 70.6% 4 68.0% 24 h aslo ZnP-PVA/CMC 67.7% 45.6% 50.5% 24h, has investigated.

Language: Английский

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