The transformation of discarded eggshells (ES) into high value-added materials through technological means and the realization of turning waste ES “stone into gold” are of great significance to the environment and sustainable economic development. CuS is a typical semiconductor with broad and powerful light absorption properties, which is widely used in photocatalytic wastewater remediation. However, the high recombination rate of CuS photogenerated electron-hole pairs limits its application. In this study, a novel waste eggshell-derived ES/CuS heterojunction photocatalyst is innovatively constructed using an adsorption-precipitation method to realize the efficient degradation of ciprofloxacin (CIP) under visible light. The results showed that the ES/CuS heterojunction photocatalyst, under visible light irradiation, could degrade CIP (20 mg/L) with a degradation efficiency of 93.7% at 5 h (including 1 h of dark reaction), which compared to the degradation efficiency of CuS (52.3%) its CIP removal was significantly increased by a factor of 1.78, and showed good stability and reusability. The superior CIP degradation performance is mainly attributed to the introduction of ES to improve the separation efficiency of CuS photogenerated carriers and can participate in redox reactions through the formation of e and h on the surface of heterojunctions under visible light irradiation, which generation of oxidizing powerful .O2 radicals which can also directly oxidize CIP. This work provides a new perspective on the reuse of waste ES and the design of CuS catalysts.
{"title":"Efficient degradation of ciprofloxacin by waste eggshells derived ES/CuS heterostructure under visible light","authors":"Guanghong Zhao, Yuan Wei, Yubing Liu, Chao Liu, Hongyu Wang, Xin Li, Ronghui Liu, Yanyan Jiang, Yulan Zhang, Yuhui Gao, Gaofeng Shi, Guoying Wang","doi":"10.1142/s1793604724510196","DOIUrl":"https://doi.org/10.1142/s1793604724510196","url":null,"abstract":"<p>The transformation of discarded eggshells (ES) into high value-added materials through technological means and the realization of turning waste ES “stone into gold” are of great significance to the environment and sustainable economic development. CuS is a typical semiconductor with broad and powerful light absorption properties, which is widely used in photocatalytic wastewater remediation. However, the high recombination rate of CuS photogenerated electron-hole pairs limits its application. In this study, a novel waste eggshell-derived ES/CuS heterojunction photocatalyst is innovatively constructed using an adsorption-precipitation method to realize the efficient degradation of ciprofloxacin (CIP) under visible light. The results showed that the ES/CuS heterojunction photocatalyst, under visible light irradiation, could degrade CIP (20 mg/L) with a degradation efficiency of 93.7% at 5 h (including 1 h of dark reaction), which compared to the degradation efficiency of CuS (52.3%) its CIP removal was significantly increased by a factor of 1.78, and showed good stability and reusability. The superior CIP degradation performance is mainly attributed to the introduction of ES to improve the separation efficiency of CuS photogenerated carriers and can participate in redox reactions through the formation of e<span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mo stretchy=\"false\">−</mo></mrow></msup></math></span><span></span> and h<span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> on the surface of heterojunctions under visible light irradiation, which generation of oxidizing powerful .O<sub>2</sub><span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mo stretchy=\"false\">−</mo></mrow></msup></math></span><span></span> radicals which can also directly oxidize CIP. This work provides a new perspective on the reuse of waste ES and the design of CuS catalysts.</p>","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"42 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-03-12DOI: 10.1142/s1793604724510184
Bin Gu, Guangyu Wen, Bo Zhang, Jhonatan Rodriguez-Pereira, Tomas Wagner
<p>In recent years, 2D metal nanomaterials have emerged as a novel class of 2D materials owing to their unique physiochemical properties. In this paper, memristive devices (Cu<span><math altimg="eq-00009.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al<span><math altimg="eq-00010.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy="false">−</mo></mrow></msub></math></span><span></span><span><math altimg="eq-00011.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg="eq-00012.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">)</mo></mrow></msub></math></span><span></span>(BE)/Cu <span><math altimg="eq-00013.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mn>2</mn><mn>1</mn></mrow></msub></math></span><span></span>(SiO<sub>2</sub>)<span><math altimg="eq-00014.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mn>7</mn><mn>9</mn></mrow></msub></math></span><span></span>/W(TE)) were fabricated utilizing 2D Cu<span><math altimg="eq-00015.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al <span><math altimg="eq-00016.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy="false">−</mo></mrow></msub></math></span><span></span><span><math altimg="eq-00017.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg="eq-00018.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">)</mo></mrow></msub></math></span><span></span> materials with different compositions as electrodes. After exfoliation by sonication, the minimum thickness of the freestanding single layer of 2D Cu<span><math altimg="eq-00019.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span> Al<span><math altimg="eq-00020.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy="false">−</mo></mrow></msub></math></span><span></span><span><math altimg="eq-00021.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg="eq-00022.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mo stretchy="false">)</mo></mrow></msub></math></span><span></span>was only 1.5 nm. Furthermore, the distribution of SET thresholds was determined by the composition of the 2D Cu<span><math altimg="eq-00023.gif" display="inline" overflow="scroll"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al<span><math altimg="eq
{"title":"Influence of 2D CuxAl(100−x) electrodes on the CuxAl(100−x)/Cu21(SiO2)79/W memristive device","authors":"Bin Gu, Guangyu Wen, Bo Zhang, Jhonatan Rodriguez-Pereira, Tomas Wagner","doi":"10.1142/s1793604724510184","DOIUrl":"https://doi.org/10.1142/s1793604724510184","url":null,"abstract":"<p>In recent years, 2D metal nanomaterials have emerged as a novel class of 2D materials owing to their unique physiochemical properties. In this paper, memristive devices (Cu<span><math altimg=\"eq-00009.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al<span><math altimg=\"eq-00010.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy=\"false\">−</mo></mrow></msub></math></span><span></span><span><math altimg=\"eq-00011.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg=\"eq-00012.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">)</mo></mrow></msub></math></span><span></span>(BE)/Cu <span><math altimg=\"eq-00013.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>2</mn><mn>1</mn></mrow></msub></math></span><span></span>(SiO<sub>2</sub>)<span><math altimg=\"eq-00014.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>7</mn><mn>9</mn></mrow></msub></math></span><span></span>/W(TE)) were fabricated utilizing 2D Cu<span><math altimg=\"eq-00015.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al <span><math altimg=\"eq-00016.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy=\"false\">−</mo></mrow></msub></math></span><span></span><span><math altimg=\"eq-00017.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg=\"eq-00018.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">)</mo></mrow></msub></math></span><span></span> materials with different compositions as electrodes. After exfoliation by sonication, the minimum thickness of the freestanding single layer of 2D Cu<span><math altimg=\"eq-00019.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span> Al<span><math altimg=\"eq-00020.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">(</mo><mn>1</mn><mn>0</mn><mn>0</mn><mo stretchy=\"false\">−</mo></mrow></msub></math></span><span></span><span><math altimg=\"eq-00021.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span><span><math altimg=\"eq-00022.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mo stretchy=\"false\">)</mo></mrow></msub></math></span><span></span>was only 1.5 nm. Furthermore, the distribution of SET thresholds was determined by the composition of the 2D Cu<span><math altimg=\"eq-00023.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span><span></span>Al<span><math altimg=\"eq","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"47 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-03-12DOI: 10.1142/s1793604724500103
Jianmin Li, Han Zhao, Kang Ma, Yikai Fu, Haitao Dai, Zhixiang Sun, Hong-Ying Gao
Solution-processed metal halide perovskite nanocrystals show promise for various potential optoelectronic applications and the exploration of the fundamental physics underlying them. However, the electronic properties of individual nanocrystals have not been thoroughly studied. Here, we applied low-temperature scanning tunneling microscopy to investigate the properties of metal halide perovskite CsPbI2Br nanocrystals with a diameter in the range of 10–20 nm. Sub-monolayer dispersions of the nanocrystal on highly oriented pyrolytic graphite and gold thin film substrates were achieved. Using scanning tunneling microscopy, we resolved topographies of individual nanocrystals on the gold film, and their electronic properties were probed by scanning tunneling spectroscopy. In our experiment, no obvious dependence of the extracted energy gap on the nanocrystal size and shape was found, which is consistent with the reported small exciton Bohr radius in metal halide perovskite materials. Additionally, we observed that the energy gaps of some nanocrystals are smaller than that of the bulk, suggesting the influence of factors such as deep-level defects/traps, ion migration, etc. on the electronic structure.
{"title":"Electronic properties of individual CsPbI2Br nanocrystals investigated by LT-STM","authors":"Jianmin Li, Han Zhao, Kang Ma, Yikai Fu, Haitao Dai, Zhixiang Sun, Hong-Ying Gao","doi":"10.1142/s1793604724500103","DOIUrl":"https://doi.org/10.1142/s1793604724500103","url":null,"abstract":"<p>Solution-processed metal halide perovskite nanocrystals show promise for various potential optoelectronic applications and the exploration of the fundamental physics underlying them. However, the electronic properties of individual nanocrystals have not been thoroughly studied. Here, we applied low-temperature scanning tunneling microscopy to investigate the properties of metal halide perovskite CsPbI<sub>2</sub>Br nanocrystals with a diameter in the range of 10–20 nm. Sub-monolayer dispersions of the nanocrystal on highly oriented pyrolytic graphite and gold thin film substrates were achieved. Using scanning tunneling microscopy, we resolved topographies of individual nanocrystals on the gold film, and their electronic properties were probed by scanning tunneling spectroscopy. In our experiment, no obvious dependence of the extracted energy gap on the nanocrystal size and shape was found, which is consistent with the reported small exciton Bohr radius in metal halide perovskite materials. Additionally, we observed that the energy gaps of some nanocrystals are smaller than that of the bulk, suggesting the influence of factors such as deep-level defects/traps, ion migration, etc. on the electronic structure.</p>","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"142 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2024-02-24DOI: 10.1142/s1793604724500097
Youxin Lou, Yuguo Yang, Zi Yang, Chaofeng Zhu, Haifeng Zhou, Ping Zhao, Xuping Wang
Given the growing interest in eco-friendly lighting solutions, the use of high-quality phosphors has become integral to the advancement of all-solid white light-emitting diodes (WLEDs). One novel phosphor, La3Ga5SiO:Mn (LGS), has been successfully synthesized via a high-temperature solid-state reaction. The crystal structure of LGS is classified as belonging to the trigonal phase, with a space group P321. The excitation spectrum exhibits a wide peak within the wavelength range of 280–440 nm. It emits a highly intense red light, with a peak emission occurring at 715 nm within the spectral range of 670–740 nm is attributed to the transition of Mn from 4A to 4T LGS:Mn demonstrates a favorable quantum efficiency of 16% when doped with a concentration of 0.25 mol% Mn. The decay curve of LGS:Mn exhibits a pattern of decreasing lifetime as the dopant concentration increases. Additionally, the LGS:Mn products demonstrate a CIE chromaticity of (0.688, 0.2644), which is located within the deep red light region. All the aforementioned findings support the potential application of LGS:Mn specimens in WLEDs, thereby contributing to the progress of environmentally friendly and energy-efficient lighting.
{"title":"Preparation and photoluminescence study of rare-earth-free red emitting La3Ga5SiO14:Mn4+phosphors","authors":"Youxin Lou, Yuguo Yang, Zi Yang, Chaofeng Zhu, Haifeng Zhou, Ping Zhao, Xuping Wang","doi":"10.1142/s1793604724500097","DOIUrl":"https://doi.org/10.1142/s1793604724500097","url":null,"abstract":"<p>Given the growing interest in eco-friendly lighting solutions, the use of high-quality phosphors has become integral to the advancement of all-solid white light-emitting diodes (WLEDs). One novel phosphor, La<sub>3</sub>Ga<sub>5</sub>SiO<span><math altimg=\"eq-00009.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>1</mn><mn>4</mn></mrow></msub></math></span><span></span>:Mn<span><math altimg=\"eq-00010.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> (LGS), has been successfully synthesized via a high-temperature solid-state reaction. The crystal structure of LGS is classified as belonging to the trigonal phase, with a space group P321. The excitation spectrum exhibits a wide peak within the wavelength range of 280–440 nm. It emits a highly intense red light, with a peak emission occurring at 715 nm within the spectral range of 670–740 nm is attributed to the transition of Mn<span><math altimg=\"eq-00011.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> from <sup>4</sup>A<span><math altimg=\"eq-00012.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>2</mn><mstyle><mtext mathvariant=\"normal\">g</mtext></mstyle></mrow></msub></math></span><span></span> to <sup>4</sup>T<span><math altimg=\"eq-00013.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>2</mn><mstyle><mtext mathvariant=\"normal\">g.</mtext></mstyle></mrow></msub></math></span><span></span> LGS:Mn<span><math altimg=\"eq-00014.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> demonstrates a favorable quantum efficiency of 16% when doped with a concentration of 0.25 mol% Mn. The decay curve of LGS:Mn<span><math altimg=\"eq-00015.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> exhibits a pattern of decreasing lifetime as the dopant concentration increases. Additionally, the LGS:Mn<span><math altimg=\"eq-00016.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> products demonstrate a CIE chromaticity of (0.688, 0.2644), which is located within the deep red light region. All the aforementioned findings support the potential application of LGS:Mn<span><math altimg=\"eq-00017.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>4</mn><mo stretchy=\"false\">+</mo></mrow></msup></math></span><span></span> specimens in WLEDs, thereby contributing to the progress of environmentally friendly and energy-efficient lighting.</p>","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"62 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140054051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-12-15DOI: 10.1142/s1793604724510093
Hanfeng Zhu, Lin Zheng, X. Liao, Gang Li
{"title":"Surface modification of TiNb alloys by hydrothermal-precalcification treatment and its excellent in vitro osteogenic bioactivity","authors":"Hanfeng Zhu, Lin Zheng, X. Liao, Gang Li","doi":"10.1142/s1793604724510093","DOIUrl":"https://doi.org/10.1142/s1793604724510093","url":null,"abstract":"","PeriodicalId":12701,"journal":{"name":"Functional Materials Letters","volume":"17 22","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138970691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}