JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Meng Dai,Zuoli He,Peng Zhang,Xin Li,Shuguang Wang
The recombination of photogenerated electrons and holes is a crucial factor limiting photocatalytic H 2 evolution. The S-scheme ZnWO 4 -ZnIn 2 S 4 heterojunction with 2D coupling interfaces was successfully synthesized using a simple solvothermal method. An effective S-scheme interfacial charge migration route at the S-scheme heterogeneous interface was determined by energy band structure analyses (such as UPS, Mott-Schottky and XPS plots), which facilitates the separation of photoexcited carriers. It is worth noting that the optimal ZnWO 4 -ZnIn 2 S 4 composite has an H 2 evolution activity of 4925.3 μmol g −1 h −1 with favourable photostability and stability. Meanwhile, the ZnWO 4 -ZnIn 2 S 4 heterojunction exhibits the maximum optical response value (2.8 mA cm −2 ) in the initial stage, effectively promoting the separation and migration of photogenerated carriers. The establishment of the built-in electric field direction at the interface can effectively promote the space charge separation between the ZnWO 4 and ZnIn 2 S 4 nanosheets, which is favorable to the photocatalytic H 2 evolution. This work provides valuable guidance for designing S-scheme heterojunction photocatalysts composed of two n-type semiconductors for energy and environmental applications.
研究领域:
材料科学
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能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kexin Wang,Zhongge Luo,Bin Xiao,Tong Zhou,Jianhong Zhao,Congcong Shen,Dequan Li,Zhishi Qiu,Jin Zhang,Tianwei He,Qingju Liu
TiO 2 photocatalysts are of great interest in the fields of environmental purification, new energy and so on, because of their non-toxicity, high stability, high redox ability and low cost. However, the photogenerated carriers are severely recombined, which limits the application of TiO 2 photocatalysts. Herein, S-scheme Cu 3 P/TiO 2 heterojunction composites were successfully synthesized by a simple and efficient microwave hydrothermal method, and the results show that the hydrogen production rate of Cu 3 P/TiO 2 is 5.83 mmol∙g −1 ∙h −1 under simulated sunlight irradiation, which is 7.3 and 83.3 times higher than that of pure TiO 2 and Cu 3 P, respectively. This excellent performance is derived from the internal electric field (IEF) and energy band bending generated by the S-scheme heterojunction formed between Cu 3 P and TiO 2 . The density functional theory (DFT) calculation indicates that the Cu 3 P possess smaller work function and more negative conduction band (CB) position than that of TiO 2 , which is very conducive to greatly improve the H + reduction ability and hydrogen production performance. This work provides a new idea for the reveal of electron transfer paths and active sites in S-scheme heterojunctions and deepens the mechanism understanding.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12801-12810
·
IF 3.553
Cao Sheng,Dai Chencheng,Yao Shangfei,Zou Bingsuo,Zhao Jialong
In recent years, light-emitting Mn 2+ -doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn 2+ d–d emission. Herein, highly efficient colloidal Mn 2+ -doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn 2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn 2+ emission can be adjusted by changing the doping level of Mn 2+ . In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn 2+ ions changed by the doping concentration. The PL intensity of Mn 2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn 2+ -doped Cd–In–S NCs as a color conversion material. The Mn 2+ -doped multicomponent semiconductor NCs reported here extend the availability of classical Mn 2+ -doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Feifei Zhou,Ganghua Pan,Renjie Mi,Mimi Zhan
Enhancing the properties of concrete using C-S-H seed has been a challenging task due to its agglomeration in the cement matrix. Here, for ensuring synthetic C-S-H disperse well in the cement matrix, it was first synthesized in situ on fly ash (FA) by co-precipitation method, and the C-S-H grown in situ on FA (C-S-H@FA) was received. And then, its phase composition, morphology and particle size distribution were studied. After that, its effect on the hydration kinetics of cement, and the workability, strength development, pore structure, durability of concrete was explored. The results showed that the hydration of cement can be stimulated more dramatically by C-S-H@FA when compared with C-S-H, as well as the strength development of concrete. Besides, the addition of C-S-H@FA can refine the pores in concrete, and make concrete more compact than incorporating C-S-H. Furthermore, when C-S-H was replaced by C-S-H@FA, the carbonation resistance and drying shrinkage resistance of concrete was improved. Therefore, it can be concluded that the C-S-H grown in situ on FA has better dispersibility than C-S-H in concrete, improving the comprehensive properties of concrete more effectively.
研究领域:
材料科学
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土木工程
✓ 已验证
DOI
高影响因子
GENETICA
·
2024
·Vol. 153
·期 1
·1-11
·
IF 1.3
Gao Shanshan,Cao Yizhuo,Miao Wenbo,Li Dongyu,Zhou Can,Zhang Kunpeng
Eucalyptol is one of the major insecticidal active ingredients in a variety of plant essential oils, and has good killing and avoidance effects on Tribolium castaneum . The presence of detoxifying enzymes glutathione S-transferase (GST) in T. castaneum makes it resistant to a variety of insecticides. However, whether GST is involved in regulating the sensitivity of eucalyptol by T. castaneum is not well understood. In our previous study, a glutathione S-transferase, TcGSTu1 , was significantly up-regulated in RNA sequencing data when T. castaneum was exposed to eucalyptol. Therefore, in this study, the role of TcGSTu1 in the regulating the sensitivity of T. castaneum to eucalyptol was studied. The enzyme activities of GST and the transcription levels of TcGSTu1 were significantly increased following stimulation with eucalyptol. When using RNA interference technology knockdown TcGSTu1 heightens the sensitivity of T. castaneum to eucalyptol, demonstrating a link between TcGSTu1 and eucalyptol detoxification metabolism. Furthermore, TcGSTu1 is expressed in all developmental stages of T. castaneum , with higher expression levels observed particularly in the late egg stage. There was significant expression of TcGSTu1 in various tissues of different organisms, including larval head, fat body, and adult head. This observation indicated a possible connection between high TcGSTu1 expression and eucalyptol detoxification. The present findings suggest that TcGSTu1 may be involved in regulating the sensitivity and response of T. castaneum to treatment with eucalyptol, providing new research insight into pest control.
研究领域:
昆虫学
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分子生物学
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害虫防治
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Penghui Shao,Xiaoguang Duan,Jun Xu,Jiayu Tian,Wenxin Shi,Shanshan Gao,Mingjun Xu,Fuyi Cui,Shaobin Wang
Recently, tremendous efforts have been devoted to developing carbon-based metal-free catalysts as an alternative to metal-based catalysts for remediation of emerging contaminants. However, further investigations have demonstrated that the durability of carbocatalysts is poor. Therefore, it is extremely desirable to seek a novel metal-free catalyst with high efficiency and superb stability. Herein, we first discovered that amorphous boron (A-boron) can be used as a metal-free catalyst for peroxymonosulfate (PMS) activation to produce free radicals for effective degradation of bisphenol S (BPS), which is a newly-occurring estrogenic endocrine-disrupting chemical. It exhibited outstanding catalytic activity and superior stability as comparing to metal-based and metal-free carbon-based catalysts. Moreover, many other typical organic pollutants in water such as bisphenol F, sulfamethoxazole, rhodamine B and methyl orange can also be effectively decomposed in A-boron/PMS oxidative system. The effects of reaction parameters on BPS degradation were systematically investigated. The catalytic oxidation mechanism was proposed. The intriguing catalytic feature of A-boron discovered in this study will provide new opportunities for the future development of A-boron based materials with promising applications in water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
You Wu,Yi Yang,Miaoli Gu,Chuanbiao Bie,Haiyan Tan,Bei Cheng,Jingsan Xu
Solar photocatalysis is a promising, green, and sustainable technique for the synthesis of H 2 O 2 . In this study, low-dimensional ZnO/ZnIn 2 S 4 S-scheme heterojunction photocatalysts are fabricated using electrostatic spinning and chemical bath deposition methods for the efficient photocatalytic production of H 2 O 2 . ZnO nanofibers loaded with 20 wt% ZnIn 2 S 4 exhibit a superior H 2 O 2 production rate of 928 μmol g −1 h −1 , which is more than four times higher than that seen in pristine hexagonal phase ZnO and ZnIn 2 S 4 . First-principles calculations and in-situ X-ray photoelectron spectroscopy reveal the charge separation and transfer mechanisms in the S-scheme heterojunction. The construction of the S-scheme heterojunction facilitates the spatial separation of charge carriers, and electrons and holes with higher redox abilities are retained. Photoelectrochemical and photoluminescence tests further show that the formation of an S-scheme heterojunction is beneficial for the separation of photoinduced charge carriers. Electrochemical tests and electron paramagnetic resonance measurements indicate that H 2 O 2 production is primarily via a two-step single-electron O 2 reduction path. This study provides a new approach for the construction of S-scheme heterojunction materials that can efficiently produce H 2 O 2 under solar irradiation.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Kexin Zhang,Rui Wang,Xin Zhong,Fubin Jiang
Rapid recombination of photogenerated electrons and holes affects the performance of a semiconductor device and limits the efficiency of photocatalytic water splitting for hydrogen production. The use of an S-scheme nanoscale heterojunction catalyst for the separation of photogenerated charge carriers is a feasible approach to achieve high-efficiency photocatalytic hydrogen evolution. Therefore, we synthesized a three-dimensional S-scheme nanoscale heterojunction catalyst (LaNi0.6Fe0.4O3/g-C3N4) and investigated its activity in photocatalytic water splitting. An analysis of the band structure (XPS, UPS, and Mott–Schottky) indicated effective interfacial charge transfer in an S-scheme nanoscale heterojunction composed of two n-type semiconductors. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectroscopy confirmed that the light-induced charge transfer followed the S-scheme mechanism. Based on the capture test (EPR) of •OH free radicals, it can be seen that the enhanced activity is attributed to the S-scheme carrier migration mechanism in heterojunction, which promotes the rapid adsorption of H+ by the abundant amino sites in g-C3N4, thus effectively generating H2. The 2D/2D LaNi0.6Fe0.4O3/g-C3N4 heterojunction has a good interface and produces a built-in electric field, improving the separation of e– and h+ while increasing the oxygen vacancy. The synergistic effect of the heterostructure and oxygen vacancy makes the photocatalyst significantly better than LaNi0.6Fe0.4O3 and g-C3N4 in visible light. The hydrogen evolution rate of the composite catalyst (LaNi0.6Fe0.4O3/g-C3N4-70 wt %) was 34.50 mmol·h–1·g–1, which was 40.6 times and 9.2 times higher than that of the catalysts (LaNiO3 and g-C3N4), respectively. After 25 h of cyclic testing, the catalyst (LaNi0.6Fe0.4O3/g-C3N4-70 wt %) composite material still exhibited excellent hydrogen evolution performance and photostability. It was confirmed that the synergistic effect between abundant active sites, enriched oxygen vacancies, and 2D/2D heterojunctions improved the photoinduced carrier separation and the light absorption efficiency of visible light. This study opens up new possibilities for the logical design of efficient photodecomposition using 2D/2D heterojunctions combined with oxygen vacancies.
研究领域:
材料科学
·
光催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1286-1296
·
IF 2.599
Cao Sheng,Zheng Jinju,Dai Chencheng,Wang Lin,Li Chengming,Yang Weiyou,Shang Minghui
In this report, doping concentration-dependent photoluminescence (PL) properties of Mn-doped ternary Zn–In–S quantum dots (QDs) were studied by using steady-state and time-resolved PL spectroscopy. The QDs PL was firstly significantly intensified with the increasing Mn doping concentration and then decreased after the doping concentration increased up to 7.5 at.%. However, their decay lifetimes exhibit a monotone decrease with Mn doping concentration ranged from 0 to 10 at.%. It can be concluded that the PL intensity was mainly determined by two factors: one was the increased efficiency of energy transfer from host excitons to Mn 2+ ion accepter, and the other was the decreased efficiency of the emission from a Mn 2+ ion, which was caused by the increased component of exposed Mn 2+ ions on QDs surface and the accelerated interaction between adjacent dopants. The competition of above two exciton relaxation dynamics processes determined the trend of the PL intensity, while the latter was responsible for the monotonously decreased lifetime of the Mn 2+ ion emission with the increasing Mn doping concentration.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yue-Jie Bai,Li-Ying Liu,Xun-Kai Duan,Guang-Xuan Zhang,Chao Wang,Xin-Yu Zhou,Changhao Wang,Bing-Rong Wang,Xiao-Lin Wei,Ru-zhi Wang
To further develop sensing materials for NO 2 gas detection practical application, the operating temperature of the sensor should be significantly reduced. In this paper, In 2 O 3 flowers were prepared by the microwave-assisted hydrothermal method . Then, In 2 O 3 was doped using TAA (thioacetamide). The prepared S-doped In 2 O 3 flowers have good gas sensitivity and significantly reduced operating temperature. When exposed to 10 ppm NO 2 gas, the corresponding response was 250 at 118 °C. It can be demonstrated by the first principle calculations, in which the doping of S atoms changes the electron structure of In 2 O 3 from semiconductor to metal with a lower potential barrier. Then, significantly affects the electron crossing the intergranular potential barriers. Therefore, the operating temperature of the sensor can be reduced. Our research results will provide new research ideas and technical approaches for designing, fabricating, and applying a new generation of In 2 O 3 gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yang Liu,Yuanyuan Wang,Jie Ma,Runping Han
ABSTRACT In this study, peanut shell was modified using β-cyclodextrin (β-CD) and citric acid to improve the adsorption capacity for removal of lead ion (Pb 2+ ) and bisphenol S (BPS) from solution in batch mode. Scanning electron microscopy, Fourier-transform infrared spectroscopy, elemental analysis, X-ray fluorescence analysis, specific surface area analysis, thermogravimetric analysis, etc were used to characterize the adsorbent before and after modification. The results showed that the adsorbent was successfully modified. The adsorption results of Pb 2+ and BPS on β-CD-PS indicated that acidic conditions were not conducive to the adsorption of Pb 2+ , the adsorption of BPS basically remained unchanged at pH 2~7, and alkaline conditions were not conducive to the adsorption. The presence of salt had a negative effect on Pb 2+ , but had no effect on the adsorption of BPS. The Langmuir and Koble–Corrigan models could predict the equilibrium adsorption process of Pb 2+ while Temkin and Koble–Corrigan models could describe the equilibrium adsorption process of BPS. The adsorption quantity from experiments is 89.6 mg·g –1 for Pb 2+ and 16.2 mg·g –1 for BPS at 293 K, respectively. The adsorption process of Pb 2+ was consistent with the pseudo-first-order and Elovich models, indicating the presence of ion-exchange in the adsorption process; the adsorption of BPS was consistent with the pseudo-second-order model, indicating that chemisorption was the main rate-controlling step. Thermodynamic studies indicated that the adsorption of Pb 2+ was a spontaneous and endothermic reaction with increasing entropy, while the adsorption of BPS was a spontaneous and exothermic reaction with decreasing entropy. 0.1 mol·L –1 HNO 3 could desorb and regenerate the β-CD-PS adsorbed Pb 2+ for three times, and 75% C 2 H 5 OH had a better desorption and regeneration effect for BPS loaded β-CD-PS. β-CD-PS can effectively remove the lead ion and BPS from mixtures and the study can provide the basis for the effective utilization of peanut shell in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Zhenyu Liu,Min Luo,Yue Cao,Linghu Meng,Yang Yang,Xiaoman Li
Doping elements in photocatalysts is a reliable strategy for efficiently utilizing solar energy. Herein, we reported the successful synthesis of S-doped Bi 2 MoO 6 (S-BMO) through a facile one-step solvothermal method utilizing Na 2 S as a sulphur source. By systematically adjusting the doping concentration of S 2- ion, it was found that when the optimal doping amount of Na 2 S was 0.7 %, the obtained photocatalyst showed a photocatalytic nitrogen fixation rate of 122.14 μmol·h −1 ·g cat -1 under visible light irradiation for 1 h, which was 3.67 times better than Bi 2 MoO 6 (BMO). Density Functional Theory (DFT) calculations demonstrated that S partially substituted O in Bi-O-Mo in S-BMO and also modulated the electronic structure of BMO. The photoreduction ability was enhanced due to the upshift of the conduction band (CB) energy level from −0.6 to −0.72 eV after S doping. This work may provide a promising method for efficient photocatalytic nitrogen fixation by doping BMO with non-metallic elements.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）