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Low-energy consumption rapid synthesis of high-fluorescence nitrogen-doped carbon dots at room temperature using a combusted shrimp shell combined solution and application to catechins detection
IF 3.1
Carbon Trends Pub Date : 2025-04-21 DOI: 10.1016/j.cartre.2025.100515
Yi Chen Huang, Jun Yi Wu
{"title":"Low-energy consumption rapid synthesis of high-fluorescence nitrogen-doped carbon dots at room temperature using a combusted shrimp shell combined solution and application to catechins detection","authors":"Yi Chen Huang,&nbsp;Jun Yi Wu","doi":"10.1016/j.cartre.2025.100515","DOIUrl":"10.1016/j.cartre.2025.100515","url":null,"abstract":"<div><div>Shrimp shells are used as the carbon and nitrogen source to produce high-fluorescence nitrogen-carbon dots at room temperature by employing a cutting process based on NaCl crystals without added nitrogen-doped agents. The synthesis process is rapid (&lt;5 min) and easy. The synthesized nitrogen-doped carbon dots (NCDs) are characterized using photoluminescence (PL) spectroscopy, transmission electron microscopy (TEM), scan electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and energy dispersive X-ray (EDX) analysis. The synthesized NCDs exhibit high fluorescence and are effectively used in the instant and fast detection of tea freshness.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100515"},"PeriodicalIF":3.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative characteristics of coal-based and graphite-based reduced graphene oxide materials
IF 3.1
Carbon Trends Pub Date : 2025-04-15 DOI: 10.1016/j.cartre.2025.100511
Sohan Bir Singh, Seyed A. Dastgheib
{"title":"Comparative characteristics of coal-based and graphite-based reduced graphene oxide materials","authors":"Sohan Bir Singh,&nbsp;Seyed A. Dastgheib","doi":"10.1016/j.cartre.2025.100511","DOIUrl":"10.1016/j.cartre.2025.100511","url":null,"abstract":"<div><div>A pristine graphite-based graphene oxide (GO) sample and GO-like samples prepared from anthracite, bituminous, and subbituminous coals were subjected to thermal reduction in a wide temperature range of 170–2800 °C to perform a comparative investigation on the physicochemical characteristics of coal-based and graphite-based reduced graphene oxide (RGO) materials. X-ray photoelectron spectroscopy showed the surface composition of both graphite-based and coal-based RGO samples became more similar at 1000–2800 °C, in which the samples prepared at 1500 °C or above had &gt;97 % carbon. Graphite-based and coal-based RGO samples exhibited increasing trends in the percentages of <em>C<img>C</em> (for carbon-carbon groups) and C<img>O (for carbon-oxygen groups) when prepared at higher temperatures. The Fourier transform infrared profiles showed a declining trend in the surface oxygen functionalities for the samples prepared from 170 °C to 600 °C, and no oxygen groups at 1000 °C. Raman spectra showed similar D and G bands for all samples below 1000 °C, but more distinctive 2D bands were observed above 2000 °C, which were sharper for the graphite- and anthracite-based samples. Surface area of all RGO samples were maximized at 1000 °C, then the porosity collapsed by two orders of magnitude at higher temperatures. The X-ray diffraction profiles showed sharper graphitic peaks for the samples prepared at higher temperatures, in which anthracite- and graphite-based samples prepared at 2400–2800 °C had characteristics similar to those of the synthetic graphite. Scanning electron microscopy of different coal-based RGO samples showed similar structures for anthracite-based and graphite-based samples.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100511"},"PeriodicalIF":3.1,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Graphene-enhanced Raman spectroscopy in ultra-low concentrations of pharmaceuticals 石墨烯增强拉曼光谱在超低浓度药物中的应用
IF 3.1
Carbon Trends Pub Date : 2025-04-15 DOI: 10.1016/j.cartre.2025.100505
Nayeli Y. Gómez-Castillo , Nardy J. Sallo-Chabla , Daniela Pérez-Zárate , María Fernanda Bósquez-Cáceres , Julio C. Chacón-Torres
{"title":"Graphene-enhanced Raman spectroscopy in ultra-low concentrations of pharmaceuticals","authors":"Nayeli Y. Gómez-Castillo ,&nbsp;Nardy J. Sallo-Chabla ,&nbsp;Daniela Pérez-Zárate ,&nbsp;María Fernanda Bósquez-Cáceres ,&nbsp;Julio C. Chacón-Torres","doi":"10.1016/j.cartre.2025.100505","DOIUrl":"10.1016/j.cartre.2025.100505","url":null,"abstract":"<div><div>In this work, we provide a novel metrology method to detect the presence of ultra-low concentrations of ibuprofen and paracetamol dissolved in water by Raman spectroscopy. We have deposited a single microdrop of the contaminated water solution onto a graphene substrate. We found that low concentrations of pharmaceuticals trigger a Graphene Surface Enhanced Raman Spectroscopy response allowing for the detection of pharmaceuticals in the low concentration limit of <span><math><mrow><mn>100</mn><mspace></mspace><mi>μ</mi><mi>g</mi></mrow></math></span>/mL. The enhancement factor observed for GERS in the G- and 2D lines reached up to 48 times derived from the molecular interaction of both molecules (graphene and the pharmaceutical), and 200 times for the D-line. Thus, we observed that the graphene monolayer enhances the pharmaceutical bands and quenches its fluorescence, allowing the identification of the pharmaceutical characteristic spectrum, which can be employed as a bio-marker of the pharmaceutical molecular presence. Finally, we performed a high-temperature treatment in vacuum conditions to study the recovery of graphene. After the thermal treatment, no contributions from ibuprofen were evident by Raman spectroscopy, but a high functionalization/oxidation stage. The conductivity of the graphene surface was also analyzed and it showed: (I) a decrease in the conductivity after the deposition of the pharmaceutical, and (II) a recovered conductance after the thermal treatment, which indicates a partial recovery of the substrate’s properties. This project brings an innovative tool for the detection of ultra-low concentrated pharmaceuticals when deposited on graphene. This discovery opens doors to a better understanding of the pollutant sources that will potentially contribute to the preservation of public sanity, pharmaceutical pollution research, and water quality monitoring in developing countries like Ecuador.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100505"},"PeriodicalIF":3.1,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ultrafast dynamics of carrier relaxation determining the quasi-1D and non-1D electronic behaviors in carbon nanostructures
IF 3.1
Carbon Trends Pub Date : 2025-04-14 DOI: 10.1016/j.cartre.2025.100510
Godai Noyama , Thomas Gauthier , Yusuke Arashida , Yui Iwasaki , Riyo Nagao , Yuri Saida , Nicolas Godin , Gaël Privault , Hiroo Suzuki , Yasuhiko Hayashi , Shota Ono , Roman Bertoni , Masaki Hada
{"title":"Ultrafast dynamics of carrier relaxation determining the quasi-1D and non-1D electronic behaviors in carbon nanostructures","authors":"Godai Noyama ,&nbsp;Thomas Gauthier ,&nbsp;Yusuke Arashida ,&nbsp;Yui Iwasaki ,&nbsp;Riyo Nagao ,&nbsp;Yuri Saida ,&nbsp;Nicolas Godin ,&nbsp;Gaël Privault ,&nbsp;Hiroo Suzuki ,&nbsp;Yasuhiko Hayashi ,&nbsp;Shota Ono ,&nbsp;Roman Bertoni ,&nbsp;Masaki Hada","doi":"10.1016/j.cartre.2025.100510","DOIUrl":"10.1016/j.cartre.2025.100510","url":null,"abstract":"<div><div>We investigate the relaxation dynamics of photoexcited carriers in bundled few-walled carbon nanotubes (CNTs) and van der Waals (vdW) heterostructures of CNTs covered with boron nitride nanotubes (BNNT) using ultrafast transient absorption spectroscopy from the near-infrared to the ultraviolet spectral range. The relaxation constant of the photoexcited carriers in bundled CNTs decreases with the photon energy of the probe, conversely, that in vdW heterostructures is almost constant with respect to the photon energy. The energy dependence of the relaxation constants for the probing photon energy determines whether the bundled CNT materials show one-dimensional (1D) or non-1D electronic behavior. The bundled CNTs show a non-1D electronic character, and the vdW heterostructures show a quasi-1D electronic one. It suggests that the bundled structure and intercalation of the insulating BNNT layer strongly influence their electronic dimensionality. These insights, offering a precise understanding of material properties, are beneficial for designing future optoelectronic devices based on nanostructured materials.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100510"},"PeriodicalIF":3.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Highly efficient caffeine-based PVA composite film for UV shielding
IF 3.1
Carbon Trends Pub Date : 2025-04-12 DOI: 10.1016/j.cartre.2025.100502
José I. Trujillo Galarza , Luis G. Corredor González , Christian Luciani , Julio C. Chacón-Torres
{"title":"Highly efficient caffeine-based PVA composite film for UV shielding","authors":"José I. Trujillo Galarza ,&nbsp;Luis G. Corredor González ,&nbsp;Christian Luciani ,&nbsp;Julio C. Chacón-Torres","doi":"10.1016/j.cartre.2025.100502","DOIUrl":"10.1016/j.cartre.2025.100502","url":null,"abstract":"<div><div>A transparent film based on a composite of polyvinyl alcohol (PVA) and caffeine was prepared for UV light absorption. The caffeine was extracted from ground coffee without further purification; in parallel, a 5.00 wt<span><math><mtext>%</mtext></math></span> aqueous PVA solution was prepared and mixed at different concentrations from the extracted caffeine. Polymeric films were prepared by spin-coating the mixed solution of PVA/caffeine deposited onto a borosilicate glass substrate. UV–Vis spectroscopy was employed to test the transparency and efficiency of UV absorption from the film. Our results revealed that the film prepared from the 1.00 wt<span><math><mtext>%</mtext></math></span> precursor solution of extracted caffeine exhibited the best absorption at the UV-C region (200 – 275 nm). On the other hand, the film prepared at the highest concentration of 5.00 wt<span><math><mtext>%</mtext></math></span> showed the best absorption in both UV-A and UV-B regions, although it was quite brittle compared to the rest. Our FTIR analysis showed a significant decrease in the OH band from PVA after adding 1.00 wt<span><math><mtext>%</mtext></math></span> crude caffeine, implying that the hydroxide sites of PVA interact with the caffeine molecules, up to saturation. This result verifies the correct integration of crude caffeine filler within the polymeric matrix <em>via</em> hydrogen bonding. X-ray diffraction analysis suggests that the <span><math><mi>α</mi></math></span>-phase of caffeine is crystallized in the composite film, however, the disappearance of the characteristic [11̄2] peak indicates the formation of caffeine clusters with preferred orientations along the [110] planes after saturation (1.00 wt<span><math><mtext>%</mtext></math></span>). It is also confirmed that the most amorphous film was 1.00 wt<span><math><mtext>%</mtext></math></span> caffeine, with a crystalline degree of approximately 14.82%. Our XPS analysis confirmed a caffeine concentration of about 0.94%, impurity level of 13.57%, and humidity level of 32.74% for the composite film prepared at 1.00 wt<span><math><mtext>%</mtext></math></span> PVA/caffeine solution. These results are of high importance in the field of polymer engineering research. Countries like Ecuador must develop coating materials that can effectively block or absorb harmful UV radiation in UV-shielding applications, which would enhance durability, performance, and protection.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100502"},"PeriodicalIF":3.1,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development and Optimization of Electrospun Respiratory Face Masks Utilizing PVDF, Graphene Oxide, and Copper Oxide Nanoparticles for Enhanced Efficiency and Antiviral Protection
IF 3.1
Carbon Trends Pub Date : 2025-04-11 DOI: 10.1016/j.cartre.2025.100508
Mohammad Mahdi Alaeddin , Abbas Honarbakhsh Raouf , Zohreh Bahrami , Reza Faridi Majidi
{"title":"Development and Optimization of Electrospun Respiratory Face Masks Utilizing PVDF, Graphene Oxide, and Copper Oxide Nanoparticles for Enhanced Efficiency and Antiviral Protection","authors":"Mohammad Mahdi Alaeddin ,&nbsp;Abbas Honarbakhsh Raouf ,&nbsp;Zohreh Bahrami ,&nbsp;Reza Faridi Majidi","doi":"10.1016/j.cartre.2025.100508","DOIUrl":"10.1016/j.cartre.2025.100508","url":null,"abstract":"<div><div>The development of efficient respiratory face masks is crucial, particularly in the context of the COVID-19 pandemic. This study fabricates an antiviral respiratory face mask electrospun technology and optimizes its parameters through response surface methodology (RSM). A three-component nanocomposite comprising polyvinylidene fluoride (PVDF), graphene oxide (GO), and copper oxide (Cu₂O) nanoparticles was investigated. The effects of varying concentrations of PVDF, GO, and Cu₂O on the mask's properties, including efficiency and pressure drop were assessed. Box-Behnken design-based response surface models were employed to predict optimal conditions. Results indicated that concentrations of PVDF (16.09%), GO (2.40%), and Cu₂O (0.4414%) provided the best performance, achieving an efficiency of 99% and a pressure drop of 36.57 Pa under optimal conditions. The nanofibers exhibited positive morphological traits, and the addition of graphene oxide and copper oxide enhanced the beta phase in the nanocomposite. Additionally, the antibacterial and antiviral properties of the mask were evaluated, demonstrating its effectiveness against microbial pathogens. Overall, the optimized nanocomposite mask presents a promising solution for enhanced respiratory protection during infectious disease outbreaks.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100508"},"PeriodicalIF":3.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of graphene oxide: A refined approach
IF 3.1
Carbon Trends Pub Date : 2025-04-08 DOI: 10.1016/j.cartre.2025.100509
Maria Refalo Magro, Daniel A. Vella, Glenn Cassar
{"title":"Synthesis of graphene oxide: A refined approach","authors":"Maria Refalo Magro,&nbsp;Daniel A. Vella,&nbsp;Glenn Cassar","doi":"10.1016/j.cartre.2025.100509","DOIUrl":"10.1016/j.cartre.2025.100509","url":null,"abstract":"<div><div>The conventional method for preparing graphene oxide (GO) relies on the use of corrosive acids namely concentrated H<sub>2</sub>SO<sub>4</sub>, HNO<sub>3</sub>, and H<sub>3</sub>PO<sub>4</sub> as well as aggressive oxidizing agents such as KMnO<sub>4</sub> and KClO<sub>4</sub>. The application of heat further exacerbates the preparation, promoting the release of harmful acidic NO<em><sub>x</sub></em> and ClO<sub>2</sub> fumes. The formation of the by-product Mn<sub>2</sub>O<sub>7</sub> could also increase the risk of explosion. A safe(r) and shorter method of preparation of GO has been a challenge for many researchers. This study presents a method of preparing GO, that reduces risks by eliminating the need for heating and shortening the oxidation step. This method utilises mixtures of concentrated H<sub>2</sub>SO<sub>4</sub> and KMnO<sub>4</sub> with graphite thus eliminating the release of toxic fumes.</div><div>Characterization studies revealed that the graphite precursor with an average lateral flake size of 15.06 ±1.87 µm was successfully oxidized to GO and subsequently exfoliated to thinner sheets. The resulting GO exhibited a reduced average lateral sheet size of 10.22 0.62 µm and comprised approximately 10 layers, indicating that the precursor material is polycrystalline. Comprehensive XPS analysis revealed that the oxygen content and chemical states of carbon in the synthesized GO was comparable to that of commercially available GO, with similar distribution of oxygen functionalities. In the in-house produced GO, the predominant functional group was found to be the C-O bond corresponding to the epoxy group, followed by the ester and acid anhydride functional groups. Furthermore, the decrease in the percentage of sp<sup>2</sup> hybridized carbon in GO to 45.52 %—measured using X-ray induced Auger spectroscopy—confirms the successful oxidation of the precursor, which initially exhibited 80.21 % sp<sup>2</sup> character in graphite.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100509"},"PeriodicalIF":3.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A comprehensive review of methylene blue dye adsorption on activated carbon from edible fruit seeds: A case study on kinetics and adsorption models
IF 3.1
Carbon Trends Pub Date : 2025-04-06 DOI: 10.1016/j.cartre.2025.100507
Safaa Talib Al-Asadi , Zainab Haider Mussa , Fouad Fadhil Al-Qaim , Hesam Kamyab , Haider Falih Shamikh Al-Saedi , Issa Farhan Deyab , Nisreen Jawad Kadhim
{"title":"A comprehensive review of methylene blue dye adsorption on activated carbon from edible fruit seeds: A case study on kinetics and adsorption models","authors":"Safaa Talib Al-Asadi ,&nbsp;Zainab Haider Mussa ,&nbsp;Fouad Fadhil Al-Qaim ,&nbsp;Hesam Kamyab ,&nbsp;Haider Falih Shamikh Al-Saedi ,&nbsp;Issa Farhan Deyab ,&nbsp;Nisreen Jawad Kadhim","doi":"10.1016/j.cartre.2025.100507","DOIUrl":"10.1016/j.cartre.2025.100507","url":null,"abstract":"<div><div>In recent years, several industries have discharged wastewater containing high quantities of dyes directly into the ecosystem, creating a significant environmental hazard due to the contamination of soil, groundwater, and surface water. The rapid growth of the textile industry has exacerbated this issue, as residual materials, particularly dyes, in treated wastewater contribute to environmental degradation. Recent studies have demonstrated that activated carbon is highly effective in removing cationic dye, specifically methylene blue (MB), from wastewater. Adsorption has become the most widely used separation technique due to its efficiency in contaminant adsorption. This study focuses on the use of both treated and untreated adsorbents derived from discarded fruit seeds. Given the global demand for food and fruits, the use of fruit seeds to produce adsorbents has gained popularity due to their low cost, biocellulose content, and availability. The adsorbents were analyzed using FTIR, BET, SEM, and thermogravimetric (TG) methods. The relationship between the pH of the methylene blue solution and the pHpzc (point of zero charge) of the adsorbent surface was thoroughly characterized. This study provides a comprehensive examination of isothermal models, kinetic models, and thermodynamic functions. The phenomenon of adsorption, along with its relationship to surface area and pH, is also investigated. Finally, it was found that biowaste fruit seeds can serve as a low-cost alternative to commercial activated carbon for the effective removal of various pollutants from the aquatic environment on a large scale.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"20 ","pages":"Article 100507"},"PeriodicalIF":3.1,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biochar from waste coffee husk as a thermal conductivity enhancer in palm stearin BPCMs 将废弃咖啡壳中的生物炭作为棕榈硬脂 BPCM 的导热增强剂
IF 3.1
Carbon Trends Pub Date : 2025-04-01 DOI: 10.1016/j.cartre.2025.100501
Andrés Chico-Proano , Juan Francisco Nicolalde , Milagros Boada , Omar Bonilla , Cristina Riofrio , Juan Andrés Cueva , Francisco Rodríguez-Clavijo , Jennyfer Bolaños-Belalcazar , Carla Suárez-Beltrán , Maria A. Sandoval. R , Haziel Diaz , Javier Martínez-Gómez
{"title":"Biochar from waste coffee husk as a thermal conductivity enhancer in palm stearin BPCMs","authors":"Andrés Chico-Proano ,&nbsp;Juan Francisco Nicolalde ,&nbsp;Milagros Boada ,&nbsp;Omar Bonilla ,&nbsp;Cristina Riofrio ,&nbsp;Juan Andrés Cueva ,&nbsp;Francisco Rodríguez-Clavijo ,&nbsp;Jennyfer Bolaños-Belalcazar ,&nbsp;Carla Suárez-Beltrán ,&nbsp;Maria A. Sandoval. R ,&nbsp;Haziel Diaz ,&nbsp;Javier Martínez-Gómez","doi":"10.1016/j.cartre.2025.100501","DOIUrl":"10.1016/j.cartre.2025.100501","url":null,"abstract":"<div><div>Bio-based phase change materials (BPCM) integrate natural sources like vegetable oils. While they typically have lower phase-change enthalpy than synthetic options, they are valued for their low toxicity and environmental impact. BPCMs provide a biodegradable alternative, but their low thermal conductivity limits efficiency in heat transfer applications. This study investigates the use of biochar derived from coffee husks as an additive to enhance thermal conductivity of palm stearin Biochar, characterized by stable chemical properties, high porosity, and significant adsorption capacity, is produced via pyrolysis, which also addresses waste management in the coffee industry and promotes renewable energy solutions, converting coffee husks into biochar effectively captures carbon that would be lost during combustion. In this way, the sample was characterized through proximate analysis, higher calorific value, crystallographic structure, and thermogravimetric analysis (TGA) to evaluate its thermal decomposition under pyrolysis conditions. Results indicate that coffee husk is an ideal candidate for pyrolysis applications; thus, biochar was produced from coffee husk in a 125 mL reactor, with a heating rate of 50 °C/min, from room temperature up to a maximum of 600 °C. TGA and differential scanning calorimetry (DSC) were employed to evaluate both palm stearin and the produced biochar, focusing on their thermal decomposition profiles. Results show that incorporating even small amounts of biochar (as low as 0.013 wt. %) significantly improves the thermal conductivity of the PCM. This study highlights the different pyrolysis temperature zones of coffee husks and compares them with the thermal behavior of palm stearin. Overall, this work underscores the potential of biochar as a sustainable additive to enhance the thermal properties of organic PCMs, contributing to the circular economy while mitigating greenhouse gas emissions from coffee waste.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"19 ","pages":"Article 100501"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rapid and green synthesis of graphitic carbon from coconut shell waste by arc plasma for high performance symmetric supercapacitors
IF 3.1
Carbon Trends Pub Date : 2025-04-01 DOI: 10.1016/j.cartre.2025.100500
Mohamed Apsar J , Ramachandran K , Nalini B
{"title":"Rapid and green synthesis of graphitic carbon from coconut shell waste by arc plasma for high performance symmetric supercapacitors","authors":"Mohamed Apsar J ,&nbsp;Ramachandran K ,&nbsp;Nalini B","doi":"10.1016/j.cartre.2025.100500","DOIUrl":"10.1016/j.cartre.2025.100500","url":null,"abstract":"<div><div>The sustainable conversion of biomass derived from low-cost agro waste into useful products is gaining popularity as global attention shifts towards green initiatives and energy efficiency. Coconut shell is considered as a potential raw material to synthesise carbon by burning it in a controlled atmosphere followed by physical / chemical activation. Various methods have been used to produce activated carbon from coconut shell. Production of graphitic carbon, which is preferred over activated carbon in supercapacitor applications, is a time consuming process and literature on the same from coconut shell is scanty. In this work, the graphitic carbon is produced rapidly and environment friendly by processing the coconut shell in thermal plasma and its potential use in energy storage applications are explored. Chemical composition, specific surface area, pore volume and average pore diameter of synthesized carbons are analyzed. An electrode for the supercapacitor is prepared from this material and electrochemical studies are performed. The specific capacitance and its retention as well as power and energy densities are notable and compared with previously published results.</div></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":"19 ","pages":"Article 100500"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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