Diamond and Related Materials最新文献_第9页

A statistical evaluation of the spectroscopic features in natural diamonds with the 480 nm absorption band 天然钻石 480 纳米吸收带光谱特征的统计评估

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-03 DOI: 10.1016/j.diamond.2025.112277

M.F. Hardman , M.Y. Lai , C.M. Breeding, S.C. Eaton-Magaña, V.A. Schwartz

{"title":"A statistical evaluation of the spectroscopic features in natural diamonds with the 480 nm absorption band","authors":"M.F. Hardman , M.Y. Lai , C.M. Breeding, S.C. Eaton-Magaña, V.A. Schwartz","doi":"10.1016/j.diamond.2025.112277","DOIUrl":"10.1016/j.diamond.2025.112277","url":null,"abstract":"<div><div>Natural diamonds referred to as “480 nm band diamonds” in the <em>gem</em> trade are colored by a broad absorption band centered at ∼480 nm in the visible range. A subset, known as “chameleon diamonds,” have green ± gray colors and a reversible color change from greenish to orange/yellow when heated above ∼120 °C, or when left in the dark for an extended period. The atomic defect(s) responsible for the 480 nm absorption band and chameleonism are debated. To evaluate the body color and spectroscopic data for more than one hundred 480 nm band diamonds with or without color change property, we apply principal component analysis. Photoluminescence spectra evaluated in this study were acquired using 455 and 785 nm laser excitations at liquid nitrogen temperatures (77 K). Several features – including a peak at 475.7 nm – occur more frequently and with greater intensities in chameleon than non-chameleon 480 nm band diamonds. Chameleon diamonds have stronger 793.5 nm peak (Ni-V-N) but weaker 882.9/884.6 nm doublets (Ni<img>V), documenting a distinct difference in the form of nickel-related defects in the diamond lattice. For these spectroscopic features there is progressive variation between those with or without visible chameleonism rather than discrete separation, suggesting that the defect(s) responsible for chameleonism may be present in low concentrations even in “non-chameleon” 480 nm band diamonds. Statistical analysis of spectroscopic features can be a robust tool to evaluate the presence of defects possibly associated with chameleonism in 480 nm band diamonds, even when a color change cannot be identified visually.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112277"},"PeriodicalIF":4.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783221","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}

引用次数: 0

Low-pressure hot isostatic pressing for the fabrication of carbon electrode-based hole-transporting material-free perovskite solar cells 用低压热等静压法制造基于碳电极的无空穴传输材料的过氧化物太阳能电池

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-03 DOI: 10.1016/j.diamond.2025.112285

Yew Hang Soo , Chai Yan Ng , Hieng Kiat Jun , Soo Ai Ng , Foo Wah Low , Rubina Bahar

{"title":"Low-pressure hot isostatic pressing for the fabrication of carbon electrode-based hole-transporting material-free perovskite solar cells","authors":"Yew Hang Soo , Chai Yan Ng , Hieng Kiat Jun , Soo Ai Ng , Foo Wah Low , Rubina Bahar","doi":"10.1016/j.diamond.2025.112285","DOIUrl":"10.1016/j.diamond.2025.112285","url":null,"abstract":"<div><div>The reliance on expensive metal electrodes has been a major barrier to the commercialization of perovskite solar cells (PSCs). Metal electrodes can only be deposited on PSCs through a batch-to-batch thermal evaporation process, which is incompatible with scalable fabrication processes essential for commercial production. On the other hand, carbon electrodes (CEs), specifically those made from graphite and carbon black, are low-cost and can be deposited using economical and facile methods such as doctor blading, screen-printing, and hot-pressing. Here, the feasibility of using a low-pressure hot isostatic pressing (HIP) to laminate carbon film onto a perovskite device stack to produce CE-based hole-transporting material-free (HTM-free) PSC was investigated. The carbon film was positioned on the caffeine-added methylammonium lead iodide (Caf-MAPbI<sub>3</sub>) perovskite film produced using a thermally enhanced vacuum-assisted solution process (VASP). The device was then vacuum-sealed in a thermoplastic bag and pressed in a HIP chamber under various pressures and temperatures for 10 min. The HIP process uniformly laminated the carbon film, promoting its seamless bonding with the Caf-MAPbI<sub>3</sub> perovskite film at pressures of ≤10 MPa. A PSC achieved a champion power conversion efficiency (PCE) of 10.54 % with the optimized HIP pressure of 6 MPa and temperature of 125 °C.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112285"},"PeriodicalIF":4.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790844","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}

引用次数: 0

Facile green biosynthesis of Ag-doped NiO anchored reduced graphene oxide nanocomposite for efficient photocatalytic remediation of wastewater pollutants: Experimental study and statistical modeling 银掺杂NiO锚定还原氧化石墨烯纳米复合材料用于废水污染物的高效光催化修复：实验研究和统计建模

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-03 DOI: 10.1016/j.diamond.2025.112279

Gauri Shukla , Manviri Rani , Uma Shanker

{"title":"Facile green biosynthesis of Ag-doped NiO anchored reduced graphene oxide nanocomposite for efficient photocatalytic remediation of wastewater pollutants: Experimental study and statistical modeling","authors":"Gauri Shukla , Manviri Rani , Uma Shanker","doi":"10.1016/j.diamond.2025.112279","DOIUrl":"10.1016/j.diamond.2025.112279","url":null,"abstract":"<div><div>Herein, the facilitation of reduced graphene oxide (rGO) layer accumulation onto Ag@NiO nanoparticles achieved via close interaction between the two materials as supported by spectroscopic and microscopic analysis, and the tuned band gap of the composite and effective charge transport pathways maximize the synergistic effect in photocatalytic processes synthesized through co-precipitation method using <em>A. indica</em> leaves extract as stabilizer for the reduction of Cr (VI) and degradation of Atrazine (ATZ) pesticide from wastewater. In comparison to bare NiO, Ag@NiO, and rGO, Ag@NiO-rGO exhibits greater photocatalytic activity at optimum conditions, achieving 96 % elimination of ATZ and 88 % reduction of Cr (VI) to Cr (III) in 90 min while adhering to first-order kinetics and the Langmuir adsorption isotherm. The reaction parameters were optimized using the response surface methodology and the Box-Behnken design model. The reduction of Cr (VI) to Cr (III) was validated using HPLC, and the intermediates of the atrazine degradation were analysed through GC–MS for interpretation of proposed degradation pathway along with interpretation of toxicity of degradation products. The major role of hydroxyl radical in the photoelimination of pollutants was also determined by radical trapping experiments. The green synthesized Ag@NiO-rGO is a cost-effective, stable composite and works as an excellent photocatalyst with high reusability up to 8 cycles and is also effective in real-time wastewater sample treatment. This work provides new insight into the creation of extremely effective visible light-active photocatalysts for the removal of various contaminants from effluent.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112279"},"PeriodicalIF":4.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783219","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}

引用次数: 0

Density distribution analysis of near-interface traps in Al2O3/diamond MOS structure Al2O3/金刚石MOS结构近界面陷阱密度分布分析

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-02 DOI: 10.1016/j.diamond.2025.112275

Xueqia Zhang, Xufang Zhang, Mingkun Li, Jing Zhang

{"title":"Density distribution analysis of near-interface traps in Al2O3/diamond MOS structure","authors":"Xueqia Zhang, Xufang Zhang, Mingkun Li, Jing Zhang","doi":"10.1016/j.diamond.2025.112275","DOIUrl":"10.1016/j.diamond.2025.112275","url":null,"abstract":"<div><div>Inversion-type p-channel diamond MOSFETs have been developed and normally-off characteristics have been realized. However, they still suffer from low channel mobility, despite water vapor annealing significantly reducing the interface state density at the Al<sub>2</sub>O<sub>3</sub>/diamond MOS interface. We have also observed notable frequency dispersion of capacitance under accumulation conditions, which is mainly attributed to near-interface traps (NITs). In this work, we focused on characterizing NITs in Al<sub>2</sub>O<sub>3</sub>/diamond structures at 300 K, 350 K, and 400 K, using a distributed circuit model. Various possible distributions for NITs were considered, including box-shaped, linearly-decaying, exponentially-decaying, and uniform distributions, to fit the capacitance–frequency (<em>C–f</em>) characteristics at these temperatures. Based on error comparisons from the fitting results, the uniform distribution exhibited the smallest fitting errors for <em>C–f</em>. The NIT density and other related parameters were extracted based on the best-fitting results, with possible physical origins discussed. This work lays the groundwork for further passivation of NITs, which is critical for improving device performance.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112275"},"PeriodicalIF":4.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777043","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}

引用次数: 0

One-step carbonization-activation synthesis of pomelo peel derived N, O-doped porous carbon for enhanced supercapacitve performance 一步碳化活化合成柚皮衍生氮氧掺杂多孔碳以增强其超电容性能

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-02 DOI: 10.1016/j.diamond.2025.112276

Rui Zhang, Duoyu Zhou, Kenan Yi, Songsong Xu, Lina Su, Jianhua Liu, Li Li, Fengyang Yu

{"title":"One-step carbonization-activation synthesis of pomelo peel derived N, O-doped porous carbon for enhanced supercapacitve performance","authors":"Rui Zhang, Duoyu Zhou, Kenan Yi, Songsong Xu, Lina Su, Jianhua Liu, Li Li, Fengyang Yu","doi":"10.1016/j.diamond.2025.112276","DOIUrl":"10.1016/j.diamond.2025.112276","url":null,"abstract":"<div><div>Biomass-derived porous carbon has gained significant interest as ideal electrode material for supercapacitor owing to eco-sustainability, cost-effectiveness, and unique inherent microstructure. Herein, N, O co-doped porous carbons have been successfully obtained by single-step carbonization-activation method using waste pomelo peel as carbon source and KHCO<sub>3</sub>/CO(NH<sub>2</sub>)<sub>2</sub> as activators. In the synthesis process, KHCO<sub>3</sub> as a pore-forming agent plays an important role, and CO(NH<sub>2</sub>)<sub>2</sub> is used to assist the pore-forming process as well as N doping. Benefiting from high specific surface area (1378.5 m<sup>2</sup>·g<sup>−1</sup>), predominant microporous structure and O, N co-doping, the best N, O co-doped porous carbon (denoted as PKNAC) exhibits high specific capacitance (364.5 F·g<sup>−1</sup>, 1 A·g<sup>−1</sup>), favorable rate performance (retaining 63.86 %, 50 A·g<sup>−1</sup>) and good cycling durability (97.32 % retention, 20,000 cycles). Notably, the assembled quasi-flexible symmetrical supercapacitor in PVA/KOH gel electrolyte achieves the energy density of 13.7 Wh·kg<sup>−1</sup> at a power density of 350 W·kg<sup>−1</sup>. This work offers a convenient approach to prepare heteroatom-doped porous carbons from biomass waste for high-performance energy storage.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112276"},"PeriodicalIF":4.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785168","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}

引用次数: 0

Preparation, regulatory mechanism, and full-spectrum fluorescence synthesis of ginkgo-derived trichromatic carbon dots 银杏源三色碳点的制备、调控机理及全光谱荧光合成

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-02 DOI: 10.1016/j.diamond.2025.112272

Changge Sun, Yuxiang Guo, Dongxu Mao, Yubao Li, Tian Li, Ren’ai Li, Qi Wang

{"title":"Preparation, regulatory mechanism, and full-spectrum fluorescence synthesis of ginkgo-derived trichromatic carbon dots","authors":"Changge Sun, Yuxiang Guo, Dongxu Mao, Yubao Li, Tian Li, Ren’ai Li, Qi Wang","doi":"10.1016/j.diamond.2025.112272","DOIUrl":"10.1016/j.diamond.2025.112272","url":null,"abstract":"<div><div>Biomass is a sustainable and eco-friendly resource with great potential as a precursor for synthesizing high-value carbon dots (CDs). This research synthesized full-spectrum fluorescence CDs using a microwave method with ginkgo leaves. The blue, green, and red fluorescent CDs have the following color coordinates according to the International Commission on Illumination (CIE): (0.18, 0.19), (0.32, 0.47), and (0.48, 0.29), respectively, with corresponding fluorescence quantum yields (QY) of 13.07, 6.09, and 6.72 %. The trichromatic CDs were comprehensively characterized to explore their properties and reveal the regulatory mechanisms responsible for the differences in their fluorescence behavior. Further investigations demonstrated that precise tuning of the mixing ratios of the trichromatic CDs enabled the realization of a full-spectrum fluorescence display ranging from blue to red. Additionally, the trichromatic CDs were effectively used in fluorescent inks and polyvinyl alcohol fluorescent films, achieving a novel fluorescent anti-counterfeiting effect. In conclusion, this work offers a green synthesis method for turning biomass into trichromatic CDs, addressing the complex challenge of fluorescent color modulation in CDs and providing valuable insights into potential applications and the full-spectrum fluorescence display of CDs.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112272"},"PeriodicalIF":4.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777041","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}

引用次数: 0

Response mechanism of interfacial spacing driven load induced tribological behavior and charge density evolution for C/Cu fretting 界面间距驱动载荷诱导C/Cu微动摩擦学行为及电荷密度演化的响应机理

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-01 DOI: 10.1016/j.diamond.2025.112274

Liyuan Xu , Zhijun Shi , Deng Pan , Hao Jiang , Dianlong Wang , Qingxiang Yang , Zbigniew Brytan , Xiaolei Xing , Yefei Zhou

{"title":"Response mechanism of interfacial spacing driven load induced tribological behavior and charge density evolution for C/Cu fretting","authors":"Liyuan Xu , Zhijun Shi , Deng Pan , Hao Jiang , Dianlong Wang , Qingxiang Yang , Zbigniew Brytan , Xiaolei Xing , Yefei Zhou","doi":"10.1016/j.diamond.2025.112274","DOIUrl":"10.1016/j.diamond.2025.112274","url":null,"abstract":"<div><div>Fretting is a major failure mode in electronic connectors within micro-electro-mechanical systems (MEMS). Understanding the friction-induced changes in interfacial electronic properties and their link to the structural evolution of diamond‑copper composites is crucial for controlling fretting in practical applications. This study examines the charge density evolution Δρ at the C(111)/Cu(111) interface and its intrinsic correlation with fretting performance under varying loads and interatomic spacings across different fretting directions. Synchronized variations in Δρ and potential energy difference ΔE are observed. Under constant fretting directions, the correlation coefficient <span><math><msub><mi>k</mi><msub><mi>F</mi><mi>N</mi></msub></msub></math></span> for ΔE and Δρ, and interatomic spacing Δz increase with load. When load varies, <span><math><msub><mi>k</mi><msub><mi>F</mi><mi>N</mi></msub></msub></math></span> shows an inverse trend relative to Δz under identical atomic spacing conditions, while their variation rates align. These findings provide an electron-level understanding of fretting mechanisms, offering a theoretical basis for designing durable, high-performance microelectronic devices.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112274"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777044","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}

引用次数: 0

Work function tuning of directly grown multi-layer graphene on silicon by PECVD and fabrication of Ag/ITO/Gr/n-Si/Ag solar cell PECVD在硅上直接生长多层石墨烯的功函数调谐及Ag/ITO/Gr/n-Si/Ag太阳能电池的制备

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-01 DOI: 10.1016/j.diamond.2025.112271

Jai Shree Bhardwaj , Anterdipan Singh , Pratima Agarwal

{"title":"Work function tuning of directly grown multi-layer graphene on silicon by PECVD and fabrication of Ag/ITO/Gr/n-Si/Ag solar cell","authors":"Jai Shree Bhardwaj , Anterdipan Singh , Pratima Agarwal","doi":"10.1016/j.diamond.2025.112271","DOIUrl":"10.1016/j.diamond.2025.112271","url":null,"abstract":"<div><div>Production of large-area, high-quality pristine graphene directly on silicon substrate from Chemical Vapor Deposition (CVD) method without metallic catalyst is highly desirable for its application in various semiconductor devices. In this work, we report synthesis of large area Graphene sheets by Plasma Enhanced Chemical Vapor Deposition (PECVD) with tunable work function based on the deposition conditions. To confirm the quality of Graphene, Raman, and XPS studies have been performed. The uniformity and surface morphology of the films has been confirmed and analyzed by FESEM. Surface roughness analysis is done by AFM. The work function has been measured through surface potential mapping by KPFM. We have observed the work function variation from 4.25 eV to 4.54 eV by varying the gas flow rates of methane and hydrogen. Later, Graphene prepared under optimized conditions were used to fabricate Ag/ITO/Gr/n-Si/Ag solar cell having efficiency of 1 %, current density of 25.52 mA/cm<sup>2</sup>, V<sub>oc</sub> of 0.13 V and FF of 0.29.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112271"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777047","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}

引用次数: 0

Graphene-integrated Ag-doped NiFe₂O₄ nanostructures for high-performance supercapacitor application 石墨烯集成ag掺杂NiFe₂O₄纳米结构在高性能超级电容器中的应用

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-01 DOI: 10.1016/j.diamond.2025.112264

Sunirmal Saha , Krutika L. Routray , Anita Parida

{"title":"Graphene-integrated Ag-doped NiFe₂O₄ nanostructures for high-performance supercapacitor application","authors":"Sunirmal Saha , Krutika L. Routray , Anita Parida","doi":"10.1016/j.diamond.2025.112264","DOIUrl":"10.1016/j.diamond.2025.112264","url":null,"abstract":"<div><div>Silver‑nickel ferrite-doped GnPs (Ag-NiFe₂O₄-GnPs) were developed as a high-performance electrode material for supercapacitor applications. Field emission scanning electron microscopy (FESEM) analysis confirmed that Ag-NiFe₂O₄ nanoparticles were uniformly dispersed on the GnPs surface through functional groups, creating a synergistic effect that enhanced electrochemical properties. The incorporation of Ag-NiFe₂O₄ significantly improved the specific capacitance and charge storage capacity of the composite material. The maximum specific capacitance achieved was 913 F/g, with the ternary Ag-NiFe₂O₄ -GnPs composite outperforming pristine NiFe₂O₄ and Ag-NiFe₂O₄ at a scan rate of 10 mV/s. The electrochemical performance was influenced by key factors such as the GnPs content, electrode configuration, electrolyte type, and operating temperature. At the highest scan rate of 100 mV/s, shown in Fig. 5, the C<sub>sp</sub> values decreased to 319 F/g, 230 F/g, and 185 F/g for graphene-doped Ag-NFO, Ag-doped NFO, and NFO, respectively. These findings highlight the potential of Ag-NiFe₂O₄ - GnPs composites to replace conventional electrode materials in supercapacitors, paving the way for sustainable and high-performance energy storage systems.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112264"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791367","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}

引用次数: 0

Synthesis of N-doped multi-walled carbon nanotubes derived from plastic waste for adsorption of Pb2+ ions in aqueous solutions 塑料废弃物中n掺杂多壁碳纳米管的合成及其对Pb2+离子的吸附

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-04-01 DOI: 10.1016/j.diamond.2025.112266

Veronica Siwalima , Joseph Y.N. Philip , Joel Nobert

{"title":"Synthesis of N-doped multi-walled carbon nanotubes derived from plastic waste for adsorption of Pb2+ ions in aqueous solutions","authors":"Veronica Siwalima , Joseph Y.N. Philip , Joel Nobert","doi":"10.1016/j.diamond.2025.112266","DOIUrl":"10.1016/j.diamond.2025.112266","url":null,"abstract":"<div><div>In this research multi-walled carbon nanotubes (MWCNTs) and nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs) adsorbents were synthesized using polypropylene plastic as the carbon precursor, with melamine serving as the nitrogen source. A two-stage chemical vapour deposition (CCVD) method was employed for the pyrolysis of polypropylene, utilizing a nickel catalyst supported by CaCO<sub>3</sub>. Results showed that the nitrogen is successfully doped on N-MWCNTs as the surface is composed of nitrogen-containing groups, leading to the decrease in the carbon nanotube's outer diameter from 22.9 nm to 21.2 nm, an increase in crystallinity index from 81.40 to 83.19, an increase in specific surface area from 46.6 m<sup>2</sup> g<sup>−1</sup> to 76 m<sup>2</sup> g<sup>−1</sup>, and an increase in pore volume from 0.09 cm<sup>3</sup> g<sup>−1</sup> to 0.18 cm<sup>3</sup> g<sup>−1</sup>, enhancing their potential for adsorption applications. MWCNTs and N-MWCNTs were applied in the removal of Pb<sup>2+</sup> ions from wastewater and the highest removal efficiency was 88.1 % in N-MWCNTs compared to 80 % in MWCNTS. The optimum conditions of pH 5, an initial concentration of 1 mg L<sup>−1</sup>, and an adsorbent dose of 0.005 g were used. Langmuir isotherm provided a better fit for the adsorption data with maximum monolayer coverage (q<sub>o</sub>) of 7.52 mg g<sup>−1</sup> for MWCNTs and 8.91 mg g<sup>−1</sup> for N-MWCNTs. The adsorption process followed pseudo-second-order kinetics, indicating that chemical adsorption, involving electron exchange or sharing, is the dominant mechanism for MWCNTs and N-MWCNTs.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"155 ","pages":"Article 112266"},"PeriodicalIF":4.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777046","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}

引用次数: 0