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Magnetic properties of carbon nanocages: Pure and with the Ni or Co inclusions
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-13 DOI: 10.1016/j.solidstatesciences.2025.107862
K.B. Tsiberkin , A.V. Sosunov , V.V. Govorina , D.S. Neznakhin , V.K. Henner , G. Sumanasekera
{"title":"Magnetic properties of carbon nanocages: Pure and with the Ni or Co inclusions","authors":"K.B. Tsiberkin ,&nbsp;A.V. Sosunov ,&nbsp;V.V. Govorina ,&nbsp;D.S. Neznakhin ,&nbsp;V.K. Henner ,&nbsp;G. Sumanasekera","doi":"10.1016/j.solidstatesciences.2025.107862","DOIUrl":"10.1016/j.solidstatesciences.2025.107862","url":null,"abstract":"<div><div>Carbon nanocages (CNCs) are promising materials for catalysis, filtration and electrochemistry. This work is devoted to the experimental and theoretical study of the magnetic properties of both pure CNCs and those encapsulated by transition metals Ni and Co. This study presents high-resolution transmission electron microscopy (HR-TEM) images of the homogeneous composite consisting of Co particles with a diameter of 3–5 nm coated with one or more layers of graphitized carbon. We also present HR-TEM images of hollow nanocages obtained after the complete etching of the metal with acid. The coercivity of the homogeneous composites (Ni and Co encapsulated) exhibited a rapid decrease below 50 K, while in the temperature range of 50–350 K, pronounced superparamagnetic properties are observed. On the other hand, in the etched material consisting of hollow carbon cages, the contribution of the diamagnetism of the carbon fraction increases with temperature. Theoretical estimates of saturation magnetization of metal nanoparticles and the electronic diamagnetic susceptibility of the carbon spheres are consistent with the experimental results.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"162 ","pages":"Article 107862"},"PeriodicalIF":3.4,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermo-mechanical and physicochemical features in Pseudo-binary Se-AgX chalcogenide glassy system
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-12 DOI: 10.1016/j.solidstatesciences.2025.107861
Anil Kumar , A. Dahshan , Neeraj Mehta
{"title":"Thermo-mechanical and physicochemical features in Pseudo-binary Se-AgX chalcogenide glassy system","authors":"Anil Kumar ,&nbsp;A. Dahshan ,&nbsp;Neeraj Mehta","doi":"10.1016/j.solidstatesciences.2025.107861","DOIUrl":"10.1016/j.solidstatesciences.2025.107861","url":null,"abstract":"<div><div>Micro-indentations were made on new samples of the Se<sub>100</sub>(AgX)<sub>0</sub> and Se<sub>95</sub>(AgX)<sub>5</sub> (where X = Cl, Br, &amp; I) systems to perform hardness measurement studies at different loads. Numerous models and methodologies, such as Meyer's law, the elastic/plastic deformation theory, Hays-Kendall's method, and the energy balance model, were used to assess the gathered Vickers microhardness data. DSC techniques were used to identify events related to thermal glass transition. Essential mechanical qualities that have been assessed include several thermos-mechanical parameters, such as the modulus of elasticity (<em>E</em>), the least micro-void formation energy (<em>E</em><sub><em>h</em></sub>), the micro-void volume (<em>V</em><sub><em>h</em></sub>), etc. Furthermore, a variety of physicochemical characteristics have been theoretically computed, such as the average coordination number (&lt;<em>r</em>&gt;), average heat of atomization (<em>H</em><sub><em>s</em></sub>), total constraints per atom (<em>N</em><sub><em>c</em></sub>), and the axial (<em>n</em><sub><em>β</em></sub>) and radial (<em>n</em><sub><em>α</em></sub>) strength of the bonds.</div><div>The findings highlight that the various thermo-mechanical parameters examined in this work reach their optimized values in the case of the Se<sub>95</sub>(AgBr)<sub>5</sub> sample. Furthermore, molar volume (<em>V</em><sub><em>m</em></sub>), compactness (<em>δ</em>), and density (<em>ρ</em>) have been computed both theoretically and experimentally.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"162 ","pages":"Article 107861"},"PeriodicalIF":3.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-dispersed single-atom Fe on N-doped biochar for efficient degradation of organic contaminants by activating peroxymonosulfate
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-12 DOI: 10.1016/j.solidstatesciences.2025.107860
Shutian Lin , Xinli Zhang , Yingzhi Chen , Yuanhong Zhong , Gao Cheng , Lin Yu
{"title":"High-dispersed single-atom Fe on N-doped biochar for efficient degradation of organic contaminants by activating peroxymonosulfate","authors":"Shutian Lin ,&nbsp;Xinli Zhang ,&nbsp;Yingzhi Chen ,&nbsp;Yuanhong Zhong ,&nbsp;Gao Cheng ,&nbsp;Lin Yu","doi":"10.1016/j.solidstatesciences.2025.107860","DOIUrl":"10.1016/j.solidstatesciences.2025.107860","url":null,"abstract":"<div><div>The Fe-N-C catalyst was synthesized using loofah sponge-derived carbon and applied for peroxymonosulfate (PMS) activation to degrade organic pollutants. The catalyst, featuring highly dispersed single-atom Fe on the N-C framework, showed outstanding activity for phenol degradation across a wide pH range. The incorporation of Fe significantly boosted the catalytic performance, achieving rapid degradation of phenol at 20 mg L<sup>−1</sup> within 10 min, using 0.5 mmol L<sup>‒</sup><sup>1</sup> of PMS and 0.2 g L<sup>−1</sup> of catalyst. Electron paramagnetic resonance (EPR) and reactive oxygen quenching experiments identified the singlet oxygen (<sup>1</sup>O<sub>2</sub>) and superoxide radical (O<sub>2</sub><sup>•‒</sup>) as the main reactive oxygen species, with the former playing a key role. It has been demonstrated that the Fe-N<sub><em>x</em></sub> structures were the active sites that facilitated the generation of <sup>1</sup>O<sub>2</sub>, thereby enhancing the catalytic activity of the Fe-N-C materials. The catalyst also effectively addressed pollutants like Rhodamine B and climbazole, indicating its potential for environmental remediation. The synthesis approach for Fe-N-C is applicable to other transition metals, such as Mn, Co, Ni, Cu, and Zn, providing valuable insights for the development of highly efficient and durable M-N-C catalysts.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"162 ","pages":"Article 107860"},"PeriodicalIF":3.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Insights into the structural chemistry, topology, and complexity of organically templated polychromates(VI) with the linear [CrnO3n+1]2– groups: Synthesis and crystal structures of 1-methylpiperazinium polychromates, (C5H14N2)Cr2O7 and (C5H14N2)Cr3O10
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-06 DOI: 10.1016/j.solidstatesciences.2025.107854
Sergey M. Aksenov , Dmitri O. Charkin , Alexander M. Banaru , Dmitri N. Dmitriev , Vadim E. Kireev , Grigory S. Ilyin , Yulia A. Vaitieva
{"title":"Insights into the structural chemistry, topology, and complexity of organically templated polychromates(VI) with the linear [CrnO3n+1]2– groups: Synthesis and crystal structures of 1-methylpiperazinium polychromates, (C5H14N2)Cr2O7 and (C5H14N2)Cr3O10","authors":"Sergey M. Aksenov ,&nbsp;Dmitri O. Charkin ,&nbsp;Alexander M. Banaru ,&nbsp;Dmitri N. Dmitriev ,&nbsp;Vadim E. Kireev ,&nbsp;Grigory S. Ilyin ,&nbsp;Yulia A. Vaitieva","doi":"10.1016/j.solidstatesciences.2025.107854","DOIUrl":"10.1016/j.solidstatesciences.2025.107854","url":null,"abstract":"<div><div>Single crystals of two new compounds, (C<sub>5</sub>H<sub>14</sub>N<sub>2</sub>)Cr<sub>2</sub>O<sub>7</sub> (<strong>1</strong>) and (C<sub>5</sub>H<sub>14</sub>N<sub>2</sub>)Cr<sub>3</sub>O<sub>10</sub> (<strong>2</strong>), were isolated from the reaction products of 1-methylpiperazine and chromium trioxide in aqueous media. The crystal structures have been studied by the means of single-crystal X-ray analysis. The unit cell parameters are: <em>a</em> = 7.8459(1) Å, <em>b</em> = 8.8295(1) Å, <em>c</em> = 15.8951(2) Å, β = 96.634(1)°, space group <em>P</em>2<sub>1</sub>/<em>n</em> for <strong>1</strong> and <em>a</em> = 8.0620(2) Å, <em>b</em> = 11.6652(4) Å, <em>c</em> = 14.5690(5) Å, β = 100.285(3)°, space group <em>P</em>2<sub>1</sub>/<em>c</em> for <strong>2</strong>. In contrast to chromate compounds templated by structurally related ethylenediammonium and piperazinediium cations, no monochromate was found in the 1-methylpiperazine – water – chromic oxide system. Both structures can be represented as nets of hydrogen bonds between the organic ammonium cations and polychromate anions. We discuss the structural features of various polychromate species (Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>, Cr<sub>3</sub>O<sub>10</sub><sup>2−</sup>, and Cr<sub>4</sub>O<sub>13</sub><sup>2−</sup>) among structures comprising organic and inorganic cations.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"162 ","pages":"Article 107854"},"PeriodicalIF":3.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimizing the cooling performance of lead telluride by doping silver
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-06 DOI: 10.1016/j.solidstatesciences.2025.107859
Li Ma , Luping Song , Zhe Zheng , Yuejing Lan , Linsen Zhou , Ruopu Liu , Yuansen Li , Zhijie Wei , Shaoyi Wu , Yan Shi , Guangkun Ren
{"title":"Optimizing the cooling performance of lead telluride by doping silver","authors":"Li Ma ,&nbsp;Luping Song ,&nbsp;Zhe Zheng ,&nbsp;Yuejing Lan ,&nbsp;Linsen Zhou ,&nbsp;Ruopu Liu ,&nbsp;Yuansen Li ,&nbsp;Zhijie Wei ,&nbsp;Shaoyi Wu ,&nbsp;Yan Shi ,&nbsp;Guangkun Ren","doi":"10.1016/j.solidstatesciences.2025.107859","DOIUrl":"10.1016/j.solidstatesciences.2025.107859","url":null,"abstract":"<div><div>Thermoelectric materials are widely employed in different areas, like deep space exploration for power generation and cooling in the thermal management of electronics. To obtain excellent performance in thermoelectric system, the materials are required to own great properties such as <em>ZT</em> at suitable temperature. Normal room-temperature materials like bismuth telluride may suffer from efficiency reduction of power generation or cooling, because of significant variation of <em>ZT</em> from 300K to 500K. Nowadays, it may be resolved by using another material lead telluride (PbTe) which is usually seen as a mid-temperature material in previous work. Recently, researchers have found that lead chalcogenides including PbTe can refrigerate near room temperature. Furthermore, we doped PbTe with silver (Ag) and found it possessed stable cooling efficiency owing to the smooth <em>ZT</em> from 300K to 523K. Through synthesizing a set of p-type Pb<sub>1-<em>x</em></sub>Ag<sub><em>x</em></sub>Te-5 at.% Te (<em>x</em> = 0–0.02) samples by melting and hot-press technology in Te-rich condition, we discovered the <em>ZT</em> was about 0.4 at 300K along with the average one reaching 0.38 and kept stable from 300K to 523K. Besides, the virtual thermoelectric cooler consisting of the 7-pair p-n junction showed the △<em>T</em><sub>max</sub> and <em>COP</em><sub>max</sub> values can reach 54.9K and 9.3 % at 300K, respectively. This investigation highlights that the PbTe-based composition with silver dopant has the potential for refrigerating devices at or near room temperature in the future.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"162 ","pages":"Article 107859"},"PeriodicalIF":3.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A C2B two-dimensional monolayer with superior electrochemical performance of anode for Mg-ion batteries
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-05 DOI: 10.1016/j.solidstatesciences.2025.107857
Azher M. Abed , Anjan Kumar , Vicky Jain , Mohd Shukri Ab Yajid , Mamata Chahar , G Sanyasi Raju , Maher Ali Rusho , Hamad M. Alkahtani
{"title":"A C2B two-dimensional monolayer with superior electrochemical performance of anode for Mg-ion batteries","authors":"Azher M. Abed ,&nbsp;Anjan Kumar ,&nbsp;Vicky Jain ,&nbsp;Mohd Shukri Ab Yajid ,&nbsp;Mamata Chahar ,&nbsp;G Sanyasi Raju ,&nbsp;Maher Ali Rusho ,&nbsp;Hamad M. Alkahtani","doi":"10.1016/j.solidstatesciences.2025.107857","DOIUrl":"10.1016/j.solidstatesciences.2025.107857","url":null,"abstract":"<div><div>In the rapidly evolving landscape of energy storage, magnesium-ion batteries (MIBs) have emerged as a promising alternative to traditional lithium-ion technologies, offering compelling advantages in cost and performance. Our research leverages advanced density functional theory (DFT) computations to explore boron-doped carbon nanosheets (BC<sub>x</sub>) as a potential anode material for next-generation MIBs. The innovative BC<sub>x</sub> nanostructure demonstrates exceptional characteristics, including high porosity and remarkable Mg ion binding capabilities. Through comprehensive computational analysis, we investigated critical parameters such as diffusion energy barrier, theoretical specific capacity, and open-circuit voltage. Our findings reveal remarkable performance metrics: complete Mg ion saturation, a theoretical specific capacity of 623.53 mAh g<sup>−1</sup>, and an impressively low open-circuit voltage of 0.10 V. The unique B<sub>2</sub>C<sub>4</sub> ring structure facilitates efficient Mg ion diffusion, positioning BC<sub>x</sub> as a promising candidate for advanced energy storage solutions.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"161 ","pages":"Article 107857"},"PeriodicalIF":3.4,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of grain size distribution in raw powders on the thermoelectric and mechanical properties of hot-extruded Bi0.4Sb1.6Te3 and Bi2Te2.85Se0.15 solid solutions
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-05 DOI: 10.1016/j.solidstatesciences.2025.107858
M.G. Lavrentev , V.P. Panchenko , Yu N. Parkhomenko , A.S. Prosviryakov , N.Yu Tabachkova , M.V. Voronov
{"title":"Effect of grain size distribution in raw powders on the thermoelectric and mechanical properties of hot-extruded Bi0.4Sb1.6Te3 and Bi2Te2.85Se0.15 solid solutions","authors":"M.G. Lavrentev ,&nbsp;V.P. Panchenko ,&nbsp;Yu N. Parkhomenko ,&nbsp;A.S. Prosviryakov ,&nbsp;N.Yu Tabachkova ,&nbsp;M.V. Voronov","doi":"10.1016/j.solidstatesciences.2025.107858","DOIUrl":"10.1016/j.solidstatesciences.2025.107858","url":null,"abstract":"<div><div>The effect of grain size distribution in raw powders on the structure and properties of <em>n</em>- and <em>p</em>-type conductivity room-temperature thermoelectric materials based on bismuth and antimony chalcogenides has been studied. Mixtures of coarse-grained and fine-grained powders have been used as raw powders. The samples have been produced using hot extrusion. The structure of the powders and the bulk materials has been studied using X-ray diffraction and electron microscopy. The thermoelectric properties of the samples have been examined using the Harman method. The mechanical properties of the samples have been tested by measuring the uniaxial compression ultimate strength. It has been shown that increasing the fraction of fine-grained powder in the raw powder mixture leads to an almost linear increase in the mechanical strength of the extruded material. The optimum grain size distribution that increases the thermoelectric figure of merit of the <em>p</em>-type conductivity materials has been found. A thermoelectric material having the thermoelectric figure of merit <em>ZT</em> = 1.02 at 330 K and <em>ZT</em> = 0.9 at 336 K for <em>p</em>- and <em>n</em>-type conductivity, respectively, has been obtained using hot extrusion.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"161 ","pages":"Article 107858"},"PeriodicalIF":3.4,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced CO₂ adsorption and selectivity in CNT and piperazine modified Ni-MOF-74 nanocomposites 增强 CNT 和哌嗪改性 Ni-MOF-74 纳米复合材料对 CO₂ 的吸附和选择性
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-04 DOI: 10.1016/j.solidstatesciences.2025.107855
Syed Turab Haider Zaidi , Aqeel Ahmad , Marhaina Ismail , Nik Abdul Hadi Md Nordin , Mohamad Azmi Bustam , Muhammad Usman , David Asubonteng , Syed Muhammad Wajahat ul Hasnain
{"title":"Enhanced CO₂ adsorption and selectivity in CNT and piperazine modified Ni-MOF-74 nanocomposites","authors":"Syed Turab Haider Zaidi ,&nbsp;Aqeel Ahmad ,&nbsp;Marhaina Ismail ,&nbsp;Nik Abdul Hadi Md Nordin ,&nbsp;Mohamad Azmi Bustam ,&nbsp;Muhammad Usman ,&nbsp;David Asubonteng ,&nbsp;Syed Muhammad Wajahat ul Hasnain","doi":"10.1016/j.solidstatesciences.2025.107855","DOIUrl":"10.1016/j.solidstatesciences.2025.107855","url":null,"abstract":"<div><div>The rising levels of CO₂ in the atmosphere, primarily due to industrial activities, have accelerated the need for effective carbon capture technologies. While metal-organic frameworks (MOFs) like Ni-MOF-74 are promising due to their high CO₂ adsorption capacity, they face challenges such as reduced selectivity and structural instability under real-world conditions. This study addresses these limitations by synthesizing a composite material, CNT@Ni-MOF-74/PZ, where carbon nanotubes (CNTs) enhance structural stability and piperazine (PZ) introduces additional amine sites to improve CO₂ capture. The composite was synthesized via a solvothermal method and characterized using XRD, FTIR, BET, FESEM, and TGA to evaluate its structural, chemical, and thermal properties. Experimental results showed a 33 % increase in CO₂ adsorption capacity, with CNT@Ni-MOF-74/PZ achieving 6.1 mmol/g at 25 °C and 1 bar, compared to 4.5 mmol/g for unmodified Ni-MOF-74. Additionally, the CO₂/CH₄ selectivity improved significantly, attributed to the synergistic effects of CNTs and PZ. Monte Carlo simulations further validated the trends observed experimentally. These findings highlight CNT@Ni-MOF-74/PZ as a highly effective material for CO₂ capture, offering promising advancements for sustainable carbon capture technologies.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"161 ","pages":"Article 107855"},"PeriodicalIF":3.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative analysis of g-C3N4 photocatalysts: Mechanisms of peroxymonosulfate activation for efficient pollutant degradation
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-03 DOI: 10.1016/j.solidstatesciences.2025.107856
Jiaxin Li , Yongran He , Yufen Liu , Zhongli Peng , Yueping Fang , Shengsen Zhang
{"title":"Comparative analysis of g-C3N4 photocatalysts: Mechanisms of peroxymonosulfate activation for efficient pollutant degradation","authors":"Jiaxin Li ,&nbsp;Yongran He ,&nbsp;Yufen Liu ,&nbsp;Zhongli Peng ,&nbsp;Yueping Fang ,&nbsp;Shengsen Zhang","doi":"10.1016/j.solidstatesciences.2025.107856","DOIUrl":"10.1016/j.solidstatesciences.2025.107856","url":null,"abstract":"<div><div>The properties of graphite-phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) catalysts, made of distinct precursors, exhibit significant differences in microstructure and photocatalytic performance. However, systematic studies on their effectiveness in activating peroxymonosulfate (PMS) for pollutant degradation remain limited. Three different kinds of g-C<sub>3</sub>N<sub>4</sub> photocatalysts—CNM, CND, and CNT—were produced in this study by pyrolyzing melamine, dicyandiamide, and thiourea, respectively. Notably, CNM exhibited high crystallinity, reduced layer spacing, and abundant nitrogen defects, contributing to a decreased recombination rate of photogenerated electrons and enhancing its photocatalytic performance. CNM activated PMS with remarkable efficiency, accomplishing a degradation rate of 95.8 % in the PMS/Light system, significantly higher than when CNM and PMS were used separately. Quenching experiments indicated that the primary active species were superoxide radicals (<strong>•</strong>O<sub>2</sub><sup>−</sup>), singlet oxygen (<sup>1</sup>O<sub>2</sub>), and photogenerated holes (h<sup>+</sup>) during degradation. Furthermore, CNM demonstrated excellent catalytic activity and stability across various pH levels and in complex environments with various inorganic anions, highlighting its strong resistance to interference. For developing low-cost and stable photocatalysts for organic wastewater degradation, this study presents an advanced approach.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"161 ","pages":"Article 107856"},"PeriodicalIF":3.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143210961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel red-emitting SrBi2B4O10:Eu3+ phosphors: Synthesis, crystal structure and luminescence
IF 3.4 3区 化学
Solid State Sciences Pub Date : 2025-02-03 DOI: 10.1016/j.solidstatesciences.2025.107853
A.P. Shablinskii , A.V. Povolotskiy , R.S. Bubnova , M.S. Avdontceva , A.A. Yuriev , S.K. Filatov
{"title":"Novel red-emitting SrBi2B4O10:Eu3+ phosphors: Synthesis, crystal structure and luminescence","authors":"A.P. Shablinskii ,&nbsp;A.V. Povolotskiy ,&nbsp;R.S. Bubnova ,&nbsp;M.S. Avdontceva ,&nbsp;A.A. Yuriev ,&nbsp;S.K. Filatov","doi":"10.1016/j.solidstatesciences.2025.107853","DOIUrl":"10.1016/j.solidstatesciences.2025.107853","url":null,"abstract":"<div><div>The novel red-emitting Sr(Bi<sub>1–<em>x</em></sub>Eu<sub><em>x</em></sub>)<sub>2</sub>B<sub>4</sub>O<sub>10</sub> (<em>x</em> = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30) phosphors were obtained by solid state reactions. Emission and excitation spectra of the Sr(Bi<sub>1–<em>x</em></sub>Eu<sub><em>x</em></sub>)<sub>2</sub>B<sub>4</sub>O<sub>10</sub> phosphors were investigated. The most intense band for all samples of the concentration series is in the region of 611 nm at excitation 392 nm. Distribution of the Eu<sup>3+</sup> ions over cation sites was refined for <em>x</em> = 0.15, 0.20 and 0.30 from single-crystal X-ray diffraction data. In the SrBi<sub>1.70</sub>Eu<sub>0.30</sub>B<sub>4</sub>O<sub>10</sub> and SrBi<sub>1.60</sub>Eu<sub>0.40</sub>B<sub>4</sub>O<sub>10</sub> crystal structures, the Eu<sup>3+</sup> ions occupy only the Bi2 site, then, the Eu<sup>3+</sup> ions occupy 57 % of the Bi1 site and 3 % of the Bi2 site in the SrBi<sub>1.40</sub>Eu<sub>0.60</sub>B<sub>4</sub>O<sub>10</sub> crystal structure. The asymmetry ratio is determined as the ratio of the integral intensity of radiative transitions <sup>5</sup>D<sub>0</sub>–<sup>7</sup>F<sub>2</sub> to <sup>5</sup>D<sub>0</sub>–<sup>7</sup>F<sub>1</sub> for Eu<sup>3+</sup> ions. This means that the local environment of europium ions does not change or changes insignificantly. The optimal concentration is <em>x</em> = 0.25. It was shown by absorption spectroscopy, that the optical band gap for this sample is equal to 3.69 ± 0.01 eV. It has been demonstrated that if Eu<sup>3+</sup> ions occupy the Bi1 and Bi2 sites, the <em>R</em><sub><em>c</em></sub> is considerably decreased, resulting in a change of energy migration in the crystal structures from one-dimensional to two-dimensional. The CIE chromaticity coordinates for the Sr(Bi<sub>1–<em>x</em></sub>Eu<sub><em>x</em></sub>)<sub>2</sub>B<sub>4</sub>O<sub>10</sub> phosphors were found to be (0.64, 0.35), which are in close proximity to the NTSC standard values of (0.67, 0.33) for commercial red phosphors. The obtained results show that the Sr(Bi<sub>1–<em>x</em></sub>Eu<sub><em>x</em></sub>)<sub>2</sub>B<sub>4</sub>O<sub>10</sub> phosphors are promising candidates for solid state lighting application.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"161 ","pages":"Article 107853"},"PeriodicalIF":3.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143211260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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