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Unveiling non-radiative center control in CsPbBr_(3) nanocrystals:A comprehensive comparative analysis of hot injection and ligandassisted reprecipitation approaches

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Nano Research 2024年第5期17卷 4525-4534页

作者： Daocheng Hong Yuchen Zhang Shuhan Pan Hanyu Liu Wei Mao Wanli Zhang Yuhui Ye Zhihong Wei Xuxing Lu Xiaoyong Wang Zhenda Lu Yuxi Tian Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210023China National Laboratory of Solid State Microstructures School of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Electronic Electrical Engineering and PhysicsFujian University of TechnologyFuzhou 350118China

Metal-halide perovskite nanocrystals(NCs)have gained significant attention in the field of optoelectronic and photonic devices due to their promising *** their exceptional optical properties,the impact of different synthetic strategies on the fundamental nature of NCs,such as nonradiative recombination centers,remains poorly *** this study,we investigated the photophysical properties of CsPbBr_(3) NCs synthesized using two distinct methods,hot injection and ligand-assisted reprecipitation,at the individual particle *** observed different blinking behaviors under specific photoexcitation power densities and proposed,through intensity-lifetime analysis and Monte-Carlo simulations,that these different synthetic strategies can fabricate NCs with similar crystal structures but distinct surface quenchers with varying energy levels,which significantly affected the photo-induced blinking-down and blinking-up behaviors in individual *** findings indicate a practical and feasible approach for controlling defect engineering in perovskite NCs,with significant implications for their use in optoelectronic and other technological applications.

关键词： metal-halide perovskite nanocrystals photophysical properties nonradiative recombination centers hot injection method ligand-assisted reprecipitation

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Upcycling waste cartons into an efficient Fenton-like chainmail catalyst CoO x @C: Process, performance, and mechanism

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Journal of environmental Chemical Engineering 2025年第3期13卷

作者： Chen-Xuan Li Wenhui Xu Bai Li Xiangyang Xu Xian-Zhong Fu Rui Deng Feng Zhang Yimin Sun Kangping Cui School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 PR China Gongda Kaiyuan Environmental Protection Tech. (Anhui) Co. Ltd. Chuzhou 239000 PR China Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering School of Chemistry and Chemical Engineering Hefei University of Technology Hefei 230026 PR China

Waste cartons produced by e-commerce and the express delivery industry pose urgent environmental and social challenges, making their recycling a critical issue in recent years. In this study, a novel strategy for upcycling waste cartons into a Fenton-like chainmail catalyst, CoO x @C-P-8 (CoO x confined carbonaceous matrix), through a one-step pyrolysis process using waste cartons adsorbed cobalt nitrate was proposed. The catalytic activity of CoO x @C-P-8 in activating peroxymonosulfate (PMS) for the removal of tetracycline hydrochloride (TCH) was thoroughly evaluated. The results indicated that the combination CoO x @C-P-8 (0.3 g/L) and PMS (1.0 mM) could remove 92 % of TCH within 60 min. Mechanistic studies revealed that both singlet oxygen ( 1 O 2 ) and radicals (i.e. SO 4 •− , O 2 •− and HO • ) contributed to TCH removal, with cobalt-loading, N-doping, and the defective graphitic structure identified as the key governing factors. The unique chainmail structure of CoO x @C-P-8 endowed it with pronounced resistance to interference from ions (Cl − , NO 3 − , HCO 3 − , H 2 PO 4 − , K + , Mg 2+ , and Na + ) and pH variations (pH 3.0–11.0). Furthermore, the high environmental viability of CoO x @C-P-8, evidenced by ease of magnetic separation and simple catalyst regeneration, was demonstrated. This work may offer a feasible strategy for upcycling waste cartons and also contribute substantively to the advancement of wastewater decontamination.

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Hydrogen charging-induced corrosion behavior evolution of an additive-manufactured austenitic stainless steel in sulfuric acid medium

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Engineering Failure Analysis 2025年 178卷

作者： Qiancheng Zhao Hong Luo Chengtao Li Bingbing Yan Guangxue Liang National Materials Corrosion and Protection Data Center Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China Key Laboratory for Corrosion and Protection of The Ministry of Education (MOE) Beijing 100083 China Materials Engineering Technology Center Suzhou Nuclear Power Research Institute Suzhou 215004 Jiangsu Province China Guangxi Fangchenggang Nuclear Power Co. Ltd. Fangchenggang 538001 China

The corrosion behavior of additive-manufactured UNS S21900 steel in 0.5 M H 2 SO 4 was studied after hydrogen charging. The results indicated the decreased corrosion resistance after hydrogen charging. Passive current density increased from 2.95 × 10 -6 to 2.01 × 10 -5 A·cm −2 after 12 h, accompanied by inductive behavior. Mott-Schottky analyses showed increased acceptor density (2.67 × 10 22 to 5.83 × 10 22 cm −3 ) and donor density (1.91 × 10 21 to 2.74 × 10 21 cm −3 ) after charging for 12 h. The O 2– /OH – ratio dropped from 2.25 to 0.05 after 12 h charging, indicating reduced compactness and protection due to the increased presence of metal hydroxides.

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A Pts Qds/Znin2s4 Heterojunction Catalyst for Efficient Photocatalytic Hydrogen Production and Reduction of P-Nitrophenol

SSRN

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SSRN 2022年

作者： Liu, Fengjiao Gao, Yan Chi, Xianhu Zhu, Zhangqing Wang, Xinlin Guan, Rongfeng Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu China

The ternary sulfide ZnIn 2 S 4 (ZIS) can effectively solve the problems of energy shortage and environmental pollution due to its appropriate band gap and excellent visible light absorption. However, ZIS still has the disadvantages of low separation efficiency and fast recombination, which limit its practical application. Therefore, in order to improve its photocatalytic performance, PtS QDs/ZIS composites were prepared by photodeposition of PtS quantum dots (PtS QDs) on ZIS in this study, and excellent photocatalytic hydrogen evolution rates (20777.07 µmol‧g -1 ‧h -1 ) were obtained, which were 2.4 and 148.4 times higher than those of ZIS-Pt and ZIS, respectively, and the quantum efficiency was 13.25% at 430 nm. Secondly, PtS QDs/ZIS also showed efficient reduction performance and good stability in the catalytic reduction of p-nitrophenol (4-NP), reaching 99.87% at 7 min. One-step photodeposition of PtS QDs provides a new idea for photocatalytic hydrogen production from water splitting and catalytic reduction of pollutants. © 2022, The Authors. All rights reserved.

关键词： Sulfur compounds

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Ternary Heterostructure Cu-Znin2s4/Wo3/Ws2 Flower-Like Microspheres for Highly-Effificient Photocatalytic Hydrogen Evolution Under Visible-Light Irradiation

SSRN

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SSRN 2023年

作者： Liu, Fengjiao Zeng, Danni Tian, Yaxi Shen, Tingzhe Gao, Yan Guan, Rongfeng Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu China

The development of a new composite photocatalyst is the key to achieve efficient photocatalytic decomposition of aquatic hydrogen. In this study, Cu-ZnIn2S4/WO3/WS2 nanostructures were prepared by a two-step hydrothermal method. The unique charge transfer mechanism of Cu-doped and mixed heterojunctions (Z-scheme heterojunctions and Type-I heterojunctions) significantly enhances charge transfer and separation, resulting in excellent photocatalytic hydrogen evolution performance of Cu-ZnIn2S4/WO3/WS2. The hydrogen evolution rate of Cu-ZnIn2S4/WO3/WS2 is 93032.29µmol·g-1·h-1, 37.82 and 3.33 times that of ZnIn2S4 and Cu-ZnIn2S4, respectively, and the quantum efficiency at 430nm is 37.04%. It is also superior to Pt-modified Cu-ZnIn2S4 (71654.39 µmol·g-1·h-1) and most reported ZnIn2S4-based photocatalysts. In addition, the density functional theory (DFT) calculation results further show that the absolute value of ∆GH* of the composite photocatalyst is significantly reduced to 0.08eV, and the adsorption-desorption potential barrier is significantly reduced, indicating that the Cu-ZnIn2S4/WO3/WS2 photocatalytic system is more favorable to H* adsorption. This excellent performance is attributed to the unique transfer mechanism of Cu doping and mixed heterojunctions. This study provides a new idea for photocatalytic hydrogen production and can provide a useful reference for future research on photocatalytic hydrogen production technology. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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A Mesoporous Nanofibrous Bivo4-Ni/Agvo3 Z-Scheme Heterojunction Photocatalyst Enhanced Photocatalytic Reduction of Cr6+ and Degradation of Rhb Under Visible Light

SSRN

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SSRN 2022年

作者： Gao, Yan Liu, Fengjiao Chi, Xianhu Tian, Yaxi Zhu, Zhangqing Guan, Rongfeng Song, Jun Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu China

BiVO4 photocatalyst is one of the effective means to solve environmental pollution. However, the low specific surface area and short photogenerated carrier lifetime of a single BiVO4 seriously restrict its development and practical application. In this study, BiVO4 nanofibers were modified by the combination strategy of doping and semiconductor recombination to enhance their photocatalytic activity. The fibers prepared by electrospinning were subjected to heat treatment to remove organic matter, so as to prepare mesoporous Ni-doped BiVO4 nanofibers. Furthermore, the mesoporous fibrous Z-scheme heterojunction photocatalyst BiVO4-Ni/AgVO3 was successfully fabricated by hydrothermal method. The synergistic effect of mesoporous structure, Ni doping and AgVO3 enabled the catalyst BiVO4-Ni/AgVO3 to obtain an excellent photocatalytic reduction of Cr6+ and degradation of RhB. The photocatalytic reduction efficiency of Cr6+ reached 99.7% at 80 min, and the degradation efficiency of RhB reached 98.6% at 30 min. The successful preparation of Z-scheme heterojunction photocatalyst BiVO4-Ni-1/AgVO3-25 has essential application prospects in photocatalytic degradation of pollutants and reduction and purification of metal ions. © 2022, The Authors. All rights reserved.

关键词： Vanadium compounds

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One-step synthesis of S-doped C-vacancy g-C3N4 with honeycomb porous nanosheets structure for efficient visible-light-driven hydrogen evolution

SSRN

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SSRN 2023年

作者： Tian, Yaxi Zeng, Danni Shen, Tingzhe Guan, Rongfeng Shi, Wenyan Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu China

A defective construction method was applied to design the molecular framework from the source and use the intermolecular forces of the raw materials to connect the long chains. The S-doped honeycomb g-C3N4 nanosheets were prepared by selective volatilization at elevated temperatures using melamine-tricyanuric acid-thiourea supramolecular liquid as precursor and template. In addition to significantly increasing the high surface area, the S-doped honeycomb g-C3N4 nanosheets also modify the band gap structure and shape. The introduction of the C defect also increased the number of reaction sites, improved visible light responsiveness, broadened the photoresponse range, and accelerated the segregated transfer of photogenerated carriers. The experimental results showed that the hydrogen production efficiency of S-PDCN-3 was 23.78 mmol‧g-1‧h-1, which was 21.8 times that of BCN (1.1 mmol‧g-1‧h-1). After adding the photosensitizer (Erythrosin B) to the photocatalytic reaction system, EB+S-PDCN-3 (the best sample of S-doped honeycomb g-C3N4 nanosheets with the sensitizer) precipitated hydrogen up to 63.8 mmol‧g-1‧h-1, which was 17.78 times greater than the hydrogen production of the EB+BCN sample (3.59 mmol‧g-1‧h-1). Furthermore, the sample was observed to experience a reduction in band gap energy, an increase in electron density near VB and a reduction of H* adsorption–desorption barrier, all of which are essential for the enhancement of the hydrogen evolution reaction. Successful preparation of S-doped honeycomb g-C3N4 nanosheets provides a simple and efficient method for developing efficient g-C3N4 photocatalysts—potential applications in the development process of hydrogen energy and pollutant degradation. © 2023, The Authors. All rights reserved.

关键词： Nanosheets

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Ternary Heterostructure Cu-Znin2s4/Wo3/Ws2 Flower-Like Microspheres for Highly-Effificient Photocatalytic Hydrogen Evolution Under Visible-Light Irradiation

SSRN

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SSRN 2023年

Developing a new composite photocatalyst is the key to achieving efficient photocatalytic decomposition of aquatic hydrogen. In this study, Cu-ZnIn2S4/WO3/WS2 nanostructures were prepared by a two-step hydrothermal method. The unique charge transfer mechanism of Cu-doped and mixed heterojunctions (Z-scheme heterojunctions and Type-I heterojunctions) significantly enhances charge transfer and separation, resulting in excellent photocatalytic hydrogen evolution performance of Cu-ZnIn2S4/WO3/WS2. The hydrogen evolution rate of Cu-ZnIn2S4/WO3/WS2 is 93032.29µmol·g-1·h-1, 37.82 and 3.33 times that of ZnIn2S4 and Cu-ZnIn2S4, respectively, and the quantum efficiency at 430nm is 37.04%. It is also superior to Pt-modified Cu-ZnIn2S4 (71654.39µmol·g-1·h-1) and most reported ZnIn2S4-based photocatalysts. In addition, the density functional theory (DFT) calculation results further show that the absolute value of ∆GH* of the composite photocatalyst is significantly reduced to 0.08eV, and the adsorption-desorption potential barrier is reduced considerably, indicating that the Cu-ZnIn2S4/WO3/WS2 photocatalytic system is more favorable to H* adsorption. This excellent performance is attributed to the unique transfer mechanism of Cu doping and mixed heterojunctions. This study provides a new idea for photocatalytic hydrogen production and can provide a valuable reference for future research on photocatalytic hydrogen production technology. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Study on structural characteristics and adsorption performance of ultrasonic treated Mn-containing sulfur transfer agent

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Journal of Energy Chemistry 2014年第6期23卷 789-794页

作者： Ruiyu Jiang Jiling Zhang Lei Zhang Qinfang Zhang Guihua Hou Ning Xu Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology East China Design Branch China Petroleum Engineering Construction Corporation College of Chemistry Chemical Engineering and Environmental Engineering Liaoning Shihua University

To prepare manganese-containing spinel sulfur transfer agent with acid peptization, ultrasonic wave is used for the first time to modify the structure of sulfur transfer agent in this work. Mini fixed bed reactor was used to investigate the effect of ultrasonic power, time and temperature on the structure and oxidation adsorption performance of sulfur transfer agent and the adsorption kinetics and mechanism of SO2 were analyzed. SEM, TEM, XRD and N2 adsorption-desorption techniques were employed to characterize and analyse the function of sulfur transfer agent. The results indicated that manganese-containing spinel is a kind of promising sulfur transfer agent and exhibits higher sulfur capacity and desulfurization degree under the selected conditions of the ultrasonic wave power of 60%, and with the treatment period for 3 h at a temperature of 60 ℃.

关键词： ultrasonic treatment Mn-containing sulfur transfer agent SO2 adsorption FCC unit mixed oxide

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Adsorption simulation of sulfur oxide on the surface of metal

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Journal of Chemical and Pharmaceutical Research 2014年第3期6卷 949-954页

作者： Jiang, Ruiyu Lan, Dengyang Chen, Chao Zhu, Tao Yang, Fanfan Zhang, Jinhong Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Yancheng China Qingdao China

An appropriate adsorption model was established by using the Canonical Ensemble Monte Carlo method, and several characters of SO2, SO3 on different metal surfaces have been simulated including adsorption site, adsorption micro-configuration and the energy structure. As can be seen from the simulated results, single component of SO2adsorbed on MgO(200) crystal surface has better adsorption properties, meanwhile SO3 molecules mainly adsorbes near the crystal surface of the aluminum atoms. Sulfur dioxide on MgO(200) crystal surface has a great influence on the adsorption site of sulfur trioxide, which makes the spaces between SO3 and MgO(200) crystal surface shorter.

关键词： Adsorption

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