Pub Date : 2024-09-28DOI: 10.1016/j.materresbull.2024.113109
Baoyi Liu , Shuo Zhang , Zihao Ye , Feixue Gao , Peng Zhao , Ming Fang , Bin Ma , Kangle Shang , Xiaoli Tan
Due to most of the U(VI) extraction methods suffering the issues of high cost and low efficiency, finding a new method is still urgent. In this work, we report a way to remove U(VI) from water by tribocatalysis, where a natural mineral of attapulgite is used as the tribocatalyst. By a careful investigation, it is confirmed that the ultrasonic-generated microbubbles rub with the attapulgite to form free radicals of h+, ·O2-, and ·OH, which could then be transformed to H2O2 to react with U(VI) to form UO2O2. The extraction rate of U(VI) from water is up to 87.88% (50 ppm) in 200 min. This work using the natural mineral attapulgite being tribocatalyst has the advantages of low cost and high efficiency, which also provide new insight into the conversion of U(VI) in natural conditions and will have great potential in the treatment of nuclide wastewater and seawater.
{"title":"Extraction of uranium from water: A strategy based on tribocatalysis","authors":"Baoyi Liu , Shuo Zhang , Zihao Ye , Feixue Gao , Peng Zhao , Ming Fang , Bin Ma , Kangle Shang , Xiaoli Tan","doi":"10.1016/j.materresbull.2024.113109","DOIUrl":"10.1016/j.materresbull.2024.113109","url":null,"abstract":"<div><div>Due to most of the U(VI) extraction methods suffering the issues of high cost and low efficiency, finding a new method is still urgent. In this work, we report a way to remove U(VI) from water by tribocatalysis, where a natural mineral of attapulgite is used as the tribocatalyst. By a careful investigation, it is confirmed that the ultrasonic-generated microbubbles rub with the attapulgite to form free radicals of h<sup>+</sup>, ·O<sub>2</sub><sup>-</sup>, and ·OH, which could then be transformed to H<sub>2</sub>O<sub>2</sub> to react with U(VI) to form UO<sub>2</sub>O<sub>2</sub>. The extraction rate of U(VI) from water is up to 87.88% (50 ppm) in 200 min. This work using the natural mineral attapulgite being tribocatalyst has the advantages of low cost and high efficiency, which also provide new insight into the conversion of U(VI) in natural conditions and will have great potential in the treatment of nuclide wastewater and seawater.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113109"},"PeriodicalIF":5.3,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-28DOI: 10.1016/j.materresbull.2024.113113
Xinyu Huai , Dengke Wang , Xiang Wu , Jinghai Liu
Supercapacitors as novel sustainable energy conversion systems have been a hot spot owing to their high specific capacitance and excellent cycle stabilities. However, the poor electron conductivity limits their further applications. Herein, we synthesize NiMoO4@NiSe2 samples by a controllable hydrothermal route. The heterogeneous structure consists of high conductive nanosheets and high capacitive particles. It can slow down the collapse of electrode materials and enhance the conductivity of material. It also facilitates ion diffusion and faradaic redox reaction, thereby improves the electrochemical performance. The as-synthesized electrode presents a specific capacity of 1193 C g-1 at 1 A g-1 and maintains 82.9 % of the initial capacitance after 10,000 times cycles. A hybrid capacitor is constructed using the composites as the electrode material. It possesses a capacitance of 101 C g-1 at 1 A g-1 and 85.8 % of the retention rate after 10,000 times charging-discharging. This impressive performance of composite could be attributed to their mesoporous surface with high specific surface area (48 m2g-1). Moreover, the supercapacitor shows excellent flexibility after folding, exhibiting a wide application prospect in the field of supercapacitors.
超级电容器作为新型的可持续能源转换系统，因其高比电容和出色的循环稳定性而成为热点。然而，较差的电子传导性限制了它们的进一步应用。在此，我们采用可控的水热法合成了 NiMoO4@NiSe2 样品。这种异质结构由高导电性纳米片和高电容性颗粒组成。它可以减缓电极材料的塌陷，增强材料的导电性。它还能促进离子扩散和法拉第氧化还原反应，从而提高电化学性能。在 1 A g-1 的条件下，合成电极的比容量为 1193 C g-1，循环 10,000 次后仍能保持初始电容的 82.9%。使用这种复合材料作为电极材料构建了一种混合电容器。它在 1 A g-1 时的电容为 101 C g-1，在 10,000 次充放电后的电容保持率为 85.8%。复合材料之所以能取得如此优异的性能，是因为其具有高比表面积（48 m2g-1）的介孔表面。此外，该超级电容器在折叠后具有极佳的柔韧性，在超级电容器领域具有广阔的应用前景。
{"title":"NiMoO4@NiSe2 microspheres as electrode materials for high-performance supercapacitor","authors":"Xinyu Huai , Dengke Wang , Xiang Wu , Jinghai Liu","doi":"10.1016/j.materresbull.2024.113113","DOIUrl":"10.1016/j.materresbull.2024.113113","url":null,"abstract":"<div><div>Supercapacitors as novel sustainable energy conversion systems have been a hot spot owing to their high specific capacitance and excellent cycle stabilities. However, the poor electron conductivity limits their further applications. Herein, we synthesize NiMoO<sub>4</sub>@NiSe<sub>2</sub> samples by a controllable hydrothermal route. The heterogeneous structure consists of high conductive nanosheets and high capacitive particles. It can slow down the collapse of electrode materials and enhance the conductivity of material. It also facilitates ion diffusion and faradaic redox reaction, thereby improves the electrochemical performance. The as-synthesized electrode presents a specific capacity of 1193 C g<sup>-1</sup> at 1 A g<sup>-1</sup> and maintains 82.9 % of the initial capacitance after 10,000 times cycles. A hybrid capacitor is constructed using the composites as the electrode material. It possesses a capacitance of 101 C g<sup>-1</sup> at 1 A g<sup>-1</sup> and 85.8 % of the retention rate after 10,000 times charging-discharging. This impressive performance of composite could be attributed to their mesoporous surface with high specific surface area (48 m<sup>2</sup>g<sup>-1</sup>). Moreover, the supercapacitor shows excellent flexibility after folding, exhibiting a wide application prospect in the field of supercapacitors.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113113"},"PeriodicalIF":5.3,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.materresbull.2024.113111
Sribalaji Mathiyalagan , Stefan Björklund , Sandra Johansson Storm , Girish Salian , Ronan Le Ruyet , Reza Younesi , Shrikant Joshi
Spinel Li4Ti5O12 (LTO) is a promising anode material for solid state thin film batteries (SSTB) due to its almost-zero volume change and promising Li-ion mobility. However, preparing LTO anodes for SSTB demands tedious vacuum-based processing steps that are not cost effective. In this context, the present study embarks on evaluating the versatile suspension plasma spraying (SPS) approach to fabricate LTO coatings without using any binder. The microstructure and stoichiometry of the fabricated LTO coatings developed through the SPS route reveals retention of ∼76 wt.% of the spinel LTO from the starting feedstock, with minor amounts of rutile and anatase TiO2. The SPS experiments yielded varying thickness build up rates of the LTO coatings depending on the processing parameters adopted. The electrochemical data of the produced LTO based electrode tested in a half-cell through galvanostatic cycling show reversible lithiation and delithiation at expected potential, thereby validating the promise of the SPS technique for potential fabrication of SSTB components once fully optimized.
{"title":"Facile one-step fabrication of Li4Ti5O12 coatings by suspension plasma spraying","authors":"Sribalaji Mathiyalagan , Stefan Björklund , Sandra Johansson Storm , Girish Salian , Ronan Le Ruyet , Reza Younesi , Shrikant Joshi","doi":"10.1016/j.materresbull.2024.113111","DOIUrl":"10.1016/j.materresbull.2024.113111","url":null,"abstract":"<div><div>Spinel Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) is a promising anode material for solid state thin film batteries (SSTB) due to its almost-zero volume change and promising Li-ion mobility. However, preparing LTO anodes for SSTB demands tedious vacuum-based processing steps that are not cost effective. In this context, the present study embarks on evaluating the versatile suspension plasma spraying (SPS) approach to fabricate LTO coatings without using any binder. The microstructure and stoichiometry of the fabricated LTO coatings developed through the SPS route reveals retention of ∼76 wt.% of the spinel LTO from the starting feedstock, with minor amounts of rutile and anatase TiO<sub>2</sub>. The SPS experiments yielded varying thickness build up rates of the LTO coatings depending on the processing parameters adopted. The electrochemical data of the produced LTO based electrode tested in a half-cell through galvanostatic cycling show reversible lithiation and delithiation at expected potential, thereby validating the promise of the SPS technique for potential fabrication of SSTB components once fully optimized.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113111"},"PeriodicalIF":5.3,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-27DOI: 10.1016/j.materresbull.2024.113112
B. Huang, H. Lv, J. Yi, Q. Wang, G. Wang
In this paper, we investigate the electrical transport properties of Zr-, La- and Pd-based metallic glassy fibers (MGFs) with diameters at microscale, which are fabricated by superplastic deformation at high temperatures. It is found that with the decrease of the diameter, the resistivity of the MGF increases with decreasing temperature more quickly. As compared to the thicker one, the structure of the thinner MGF is more strongly rejuvenated with a larger relaxation enthalpy, a larger average short-range atomic distance and less crystal-like structure induced by the larger normal stress during its formation process. Based on the evolution of the heterogeneous structure, the dependence of electrical resistivity on the size for the MGFs is interpreted within the extended Ziman liquid-metal theory. The results might be significant for controlling the electrical properties of MGFs via tunning their glassy states and applying them in micro-electromechanical systems.
{"title":"Size dependence of electrical resistivity caused by stress-induced rejuvenation for metallic glassy microfibers","authors":"B. Huang, H. Lv, J. Yi, Q. Wang, G. Wang","doi":"10.1016/j.materresbull.2024.113112","DOIUrl":"10.1016/j.materresbull.2024.113112","url":null,"abstract":"<div><div>In this paper, we investigate the electrical transport properties of Zr-, La- and Pd-based metallic glassy fibers (MGFs) with diameters at microscale, which are fabricated by superplastic deformation at high temperatures. It is found that with the decrease of the diameter, the resistivity of the MGF increases with decreasing temperature more quickly. As compared to the thicker one, the structure of the thinner MGF is more strongly rejuvenated with a larger relaxation enthalpy, a larger average short-range atomic distance and less crystal-like structure induced by the larger normal stress during its formation process. Based on the evolution of the heterogeneous structure, the dependence of electrical resistivity on the size for the MGFs is interpreted within the extended Ziman liquid-metal theory. The results might be significant for controlling the electrical properties of MGFs via tunning their glassy states and applying them in micro-electromechanical systems.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113112"},"PeriodicalIF":5.3,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.materresbull.2024.113110
Hong Li , Guidong Li , Zhanyuan Yang , Honggang Liu , Xuan Zhang , Jinke Zhu , Weitao Li , Yanhui Li
A nanoporous Co3S4/BiVO4 composites were successfully fabricated via electrodeposition, immersion and oil-bath heating methods. ZIF-67 was used as a cobalt source and template. Co3S4/BiVO4 obtained by treatment for 6 h displayed the best photocathodic protection (PCP) performance. Under light, Co3S4–6 h/BiVO4 reduced the potential of 304 stainless steel (SS) to −490 mV vs. SCE, which was 200 mV below that of pure BiVO4. In addition, the photocurrent densities of 304 SS coupled with Co3S4–6 h/BiVO4 were up to 13 μA cm−2, which was more than 4 times that of pure BiVO4. Remarkably, the Rct of 304 SS coupled with Co3S4–6h/BiVO4 (142.6 Ω·cm2) was 1/27 of that of pure BiVO4 (3918 Ω·cm2). The outstanding PCP property of Co3S4/BiVO4 can be owed to the synergistic effects of strong visible light absorption, improved charge transfer efficiency, and enhanced electron storage capacity. These advantages make Co3S4/BiVO4 a promising candidate for providing effective PCP effects on metals.
{"title":"Enhanced photocathodic protection performance of Co3S4 nanoparticles modified porous BiVO4 composites for 304 stainless steel","authors":"Hong Li , Guidong Li , Zhanyuan Yang , Honggang Liu , Xuan Zhang , Jinke Zhu , Weitao Li , Yanhui Li","doi":"10.1016/j.materresbull.2024.113110","DOIUrl":"10.1016/j.materresbull.2024.113110","url":null,"abstract":"<div><div>A nanoporous Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> composites were successfully fabricated via electrodeposition, immersion and oil-bath heating methods. ZIF-67 was used as a cobalt source and template. Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> obtained by treatment for 6 h displayed the best photocathodic protection (PCP) performance. Under light, Co<sub>3</sub>S<sub>4</sub>–6 h/BiVO<sub>4</sub> reduced the potential of 304 stainless steel (SS) to −490 mV vs. SCE, which was 200 mV below that of pure BiVO<sub>4</sub>. In addition, the photocurrent densities of 304 SS coupled with Co<sub>3</sub>S<sub>4</sub>–6 h/BiVO<sub>4</sub> were up to 13 μA cm<sup>−2</sup>, which was more than 4 times that of pure BiVO<sub>4</sub>. Remarkably, the <em>R</em><sub>ct</sub> of 304 SS coupled with Co<sub>3</sub>S<sub>4</sub>–6h/BiVO<sub>4</sub> (142.6 Ω·cm<sup>2</sup>) was 1/27 of that of pure BiVO<sub>4</sub> (3918 Ω·cm<sup>2</sup>). The outstanding PCP property of Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> can be owed to the synergistic effects of strong visible light absorption, improved charge transfer efficiency, and enhanced electron storage capacity. These advantages make Co<sub>3</sub>S<sub>4</sub>/BiVO<sub>4</sub> a promising candidate for providing effective PCP effects on metals.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113110"},"PeriodicalIF":5.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.materresbull.2024.113108
Soner Çakar , Cengiz Soykan , Mahmut Özacar
Recently, the utilization of quasi solid electrolytes has increased to overcome the stability and leakage issues caused by using liquid electrolytes in dye-sensitized solar cells. For this purpose, the novel different amounts of polystyrene/polyacrylonitrile/polyindole based quasi solid electrolytes were prepared and characterized via FTIR, GPC, TGA, DSC and electrochemical procedures. We aimed to develop conductive polymer-based solid electrolytes to be used in DSSCs to improve both solar cell conversion efficiency and stability. The conversion efficiency value of the solar cell using semi-solid electrolyte (PC4) boosted (9.91%) compared to the one using liquid electrolyte (9.74%). Additionally, the solar cells’ stabilities prepared with quasi solid electrolytes are two times higher than solar cells including liquid electrolytes. Therefore, in this study, the potentials of using conductive polymer-based quasi solid electrolytes in DSSCs were investigated and promising results were acquired for future applications.
{"title":"Polystyrene/Polyacrylonitrile/Polyindole based quasi solid electrolytes for DSSCs: Boosting both efficiency and stability","authors":"Soner Çakar , Cengiz Soykan , Mahmut Özacar","doi":"10.1016/j.materresbull.2024.113108","DOIUrl":"10.1016/j.materresbull.2024.113108","url":null,"abstract":"<div><div>Recently, the utilization of quasi solid electrolytes has increased to overcome the stability and leakage issues caused by using liquid electrolytes in dye-sensitized solar cells. For this purpose, the novel different amounts of polystyrene/polyacrylonitrile/polyindole based quasi solid electrolytes were prepared and characterized via FTIR, GPC, TGA, DSC and electrochemical procedures. We aimed to develop conductive polymer-based solid electrolytes to be used in DSSCs to improve both solar cell conversion efficiency and stability. The conversion efficiency value of the solar cell using semi-solid electrolyte (PC4) boosted (9.91%) compared to the one using liquid electrolyte (9.74%). Additionally, the solar cells’ stabilities prepared with quasi solid electrolytes are two times higher than solar cells including liquid electrolytes. Therefore, in this study, the potentials of using conductive polymer-based quasi solid electrolytes in DSSCs were investigated and promising results were acquired for future applications.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113108"},"PeriodicalIF":5.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.materresbull.2024.113105
P. Nikhil Mohan , C. Thirmal , Andrews Joseph , B. Arun , Karmegam Shanmuga Priya , Pattukkannu Murugavel , K.C. James Raju
This study probes the enhancement of the microwave, ferroelectric and electromechanical properties of electroactive polymer (EAP) blended films made out of P(VDF-TrFE) and Nafion. Blended films are synthesized using the solution casting method, with different Nafion volume percentage (0 % to 30 %), and the phase formation is confirmed using XRD and FTIR spectroscopy. The morphological features are studied using FESEM. The reflection loss of the blended films as a function of thickness has been studied in both X and Ku band using a VNA. The contribution of reflection and absorption to the shielding effectiveness are also explored. 10 % Nafion inclusion effectively minimizes microwave reflection. The P-E hysteresis study reveals that the blended films exhibit high performance in terms of the parameters. The electromechanical coupling factor has been enhanced for 10 % Nafion inclusion. These findings suggest that the blended films have potential applications in flexible piezoelectric sensors, capacitors, memory, and microwave devices.
{"title":"Microwave, ferroelectric and electromechanical studies of free standing blended electroactive polymer films","authors":"P. Nikhil Mohan , C. Thirmal , Andrews Joseph , B. Arun , Karmegam Shanmuga Priya , Pattukkannu Murugavel , K.C. James Raju","doi":"10.1016/j.materresbull.2024.113105","DOIUrl":"10.1016/j.materresbull.2024.113105","url":null,"abstract":"<div><div>This study probes the enhancement of the microwave, ferroelectric and electromechanical properties of electroactive polymer (EAP) blended films made out of P(VDF-TrFE) and Nafion. Blended films are synthesized using the solution casting method, with different Nafion volume percentage (0 % to 30 %), and the phase formation is confirmed using XRD and FTIR spectroscopy. The morphological features are studied using FESEM. The reflection loss of the blended films as a function of thickness has been studied in both X and Ku band using a VNA. The contribution of reflection and absorption to the shielding effectiveness are also explored. 10 % Nafion inclusion effectively minimizes microwave reflection. The P-E hysteresis study reveals that the blended films exhibit high performance in terms of the parameters. The electromechanical coupling factor has been enhanced for 10 % Nafion inclusion. These findings suggest that the blended films have potential applications in flexible piezoelectric sensors, capacitors, memory, and microwave devices.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113105"},"PeriodicalIF":5.3,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study reports on the enhanced photocatalytic and chemocatalytic performance of ZnO/carbon dots (CDs) nanocomposites for the degradation of methylene blue (MB) dye. Carbon quantum dots were prepared by employing Moringa oleifera gum powder as a carbon source through the hydrothermal process. ZnO/CQDs nanocomposites were synthesized by dispersing ZnO nanoparticles into carbon quantum dot solution. The obtained samples were characterized by using techniques like FTIR, UV, and SEM with EDX analysis. When the methylene blue (MB) dye was exposed to visible light at room temperature, the ZnO/CQDs nanocomposites photocatalyst exhibited more photocatalytic and chemocatalytic activity than the pure ZnO nanoparticle photocatalyst. Antibacterial activity and cytotoxic assay of ZnO/CQDs nanocomposites were also investigated. In addition to protecting the environment, the purpose of this research is to create a new visible-light photocatalyst for the effective treatment of organic wastewater.
{"title":"ZnO/carbon quantum dots nanocomposites derived from Moringa oleifera gum: An improved catalytic vitiation of methylene blue dye","authors":"Shehla Parveen , Nida Latif , Ghayoor Abbas Chotana , Aqsa Kanwal , Shahid Hussain , Mohamed A. Habila , Amjad Iqbal , Rajesh Kumar Manavalan , Nosheen Farooq","doi":"10.1016/j.materresbull.2024.113106","DOIUrl":"10.1016/j.materresbull.2024.113106","url":null,"abstract":"<div><div>The present study reports on the enhanced photocatalytic and chemocatalytic performance of ZnO/carbon dots (CDs) nanocomposites for the degradation of methylene blue (MB) dye. Carbon quantum dots were prepared by employing Moringa oleifera gum powder as a carbon source through the hydrothermal process. ZnO/CQDs nanocomposites were synthesized by dispersing ZnO nanoparticles into carbon quantum dot solution. The obtained samples were characterized by using techniques like FTIR, UV, and SEM with EDX analysis. When the methylene blue (MB) dye was exposed to visible light at room temperature, the ZnO/CQDs nanocomposites photocatalyst exhibited more photocatalytic and chemocatalytic activity than the pure ZnO nanoparticle photocatalyst. Antibacterial activity and cytotoxic assay of ZnO/CQDs nanocomposites were also investigated. In addition to protecting the environment, the purpose of this research is to create a new visible-light photocatalyst for the effective treatment of organic wastewater.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113106"},"PeriodicalIF":5.3,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-21DOI: 10.1016/j.materresbull.2024.113098
Xinjing Xie , Yangyang Tuo , Siyu Cheng , Di Gao , Mengkun Zhang , Xiang Liu , Huajuan Deng , Ruijin Yu
The novel Dy3+-doped NaMgLaTeO6 (NaMgLaTeO6:Dy3+) phosphors were produced through a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement manifest that the pure phosphor was committed to the space group (P21/m (11)) and features the double perovskite structure. The band gap (Eg) of the direct semiconductor NaMgLaTeO6 is calculated to be 2.065 eV. Under 388 nm excitation, the 4F9/2→6H13/2 energy level transition contributes to the maximum emission peak at 572 nm. Other properties of the phosphor include optimal concentration (x = 5 mol %), high thermal stability, activation energy (Ea = 0.31 eV), and internal quantum efficiency (IQE = 31.44 %). The relevant color coordinate of the white light emitting diode (w-LED) prepared by the phosphor is (0.298, 0.311). The features of the latent fingerprint (LFP) created by NaMgLaTeO6:Dy3+ can be clearly reflected on different surfaces. In summary, NaMgLaTeO6:Dy3+ phosphor has proven high potential in w-LEDs production and LFP detection.
{"title":"Thermal stable NaMgLaTeO6:Dy3+ double perovskite yellow phosphors for w-LEDs and latent fingerprint visualization","authors":"Xinjing Xie , Yangyang Tuo , Siyu Cheng , Di Gao , Mengkun Zhang , Xiang Liu , Huajuan Deng , Ruijin Yu","doi":"10.1016/j.materresbull.2024.113098","DOIUrl":"10.1016/j.materresbull.2024.113098","url":null,"abstract":"<div><p>The novel Dy<sup>3+</sup>-doped NaMgLaTeO<sub>6</sub> (NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup>) phosphors were produced through a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement manifest that the pure phosphor was committed to the space group (P2<em><sub>1/m</sub></em> (11)) and features the double perovskite structure. The band gap (<em>E</em><sub>g</sub>) of the direct semiconductor NaMgLaTeO<sub>6</sub> is calculated to be 2.065 eV. Under 388 nm excitation, the <sup>4</sup>F<sub>9/2</sub>→<sup>6</sup>H<sub>13/2</sub> energy level transition contributes to the maximum emission peak at 572 nm. Other properties of the phosphor include optimal concentration (<em>x</em> = 5 mol %), high thermal stability, activation energy (<em>E</em><sub>a</sub> = 0.31 eV), and internal quantum efficiency (IQE = 31.44 %). The relevant color coordinate of the white light emitting diode (w-LED) prepared by the phosphor is (0.298, 0.311). The features of the latent fingerprint (LFP) created by NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup> can be clearly reflected on different surfaces. In summary, NaMgLaTeO<sub>6</sub>:Dy<sup>3+</sup> phosphor has proven high potential in w-LEDs production and LFP detection.</p></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113098"},"PeriodicalIF":5.3,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S002554082400429X/pdfft?md5=15c860797c7fcefc556b6c7c2a8f1427&pid=1-s2.0-S002554082400429X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.materresbull.2024.113104
Smriti Ranjit , Jennifer R. Soliz , Tecia Grier , Ka Ming Law , Sujan Budhathoki , Adam J. Hauser
The Zr-based metal-organic framework UiO-66-NH2 has been investigated to study the effects of ultraviolet and visible light exposure under dry air and humid environments. Significant impedance and color changes in the material due to ultraviolet and blue light have been observed. These changes happen more rapidly and grow larger in total cumulative magnitude as the atmospheric humidity increases. Samples placed in darkness or in the presence of light with lower energy than blue (450 nm) light showed no discoloration or degradation, regardless of humidity. Impedance data modeling suggests that humidity increases the ionic conductivity of the material and that the degradation occurs at grain boundaries, to a depth that increases with humidity. Nuclear magnetic resonance, X-ray diffraction, and Fourier transform infrared spectroscopy indicate that degradation in samples exposed to light are due to broken linkers between the benzenedicarboxylic acid and Zr clusters. Distribution Statement A. Approved for Public Release. Distribution Unlimited.
{"title":"Humidity-enhanced photodegradation mechanism of UiO-66-NH2 metal organic framework","authors":"Smriti Ranjit , Jennifer R. Soliz , Tecia Grier , Ka Ming Law , Sujan Budhathoki , Adam J. Hauser","doi":"10.1016/j.materresbull.2024.113104","DOIUrl":"10.1016/j.materresbull.2024.113104","url":null,"abstract":"<div><div>The Zr-based metal-organic framework UiO-66-NH<sub>2</sub> has been investigated to study the effects of ultraviolet and visible light exposure under dry air and humid environments. Significant impedance and color changes in the material due to ultraviolet and blue light have been observed. These changes happen more rapidly and grow larger in total cumulative magnitude as the atmospheric humidity increases. Samples placed in darkness or in the presence of light with lower energy than blue (450 nm) light showed no discoloration or degradation, regardless of humidity. Impedance data modeling suggests that humidity increases the ionic conductivity of the material and that the degradation occurs at grain boundaries, to a depth that increases with humidity. Nuclear magnetic resonance, X-ray diffraction, and Fourier transform infrared spectroscopy indicate that degradation in samples exposed to light are due to broken linkers between the benzenedicarboxylic acid and Zr clusters. Distribution Statement A. Approved for Public Release. Distribution Unlimited.</div></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":"181 ","pages":"Article 113104"},"PeriodicalIF":5.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025540824004355/pdfft?md5=39c5d2c4f5931f1d4d5919e4684122ce&pid=1-s2.0-S0025540824004355-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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