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Mechanical pressing method for making high-quality perovskite single crystals

Journal of Semiconductors 2023年第11期44卷 1-4页

作者： Chenglin Wang Jie Sun Jiangzhao Chen Cong Chen Liming Ding State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Macao Institute of Materials Science and Engineering(MIMSE) Macao University of Science and TechnologyMacao 999078China

Halide perovskites show excellent photovoltaic properties[1−4].However,the preparation of high-quality perovskite crystals remains a great challenge,which limits their *** materials applied to photodetectors mainly include polycrystalline thin films and single *** solution methods are used to prepare polycrystalline thin films,and the films are full of defects such as voids and grain boundaries[5−7].Compared to polycrystalline thin films,perovskite single crystals possess high crystallinity and low defect density[8−10].Photodetectors based on perovskite single crystals exhibit excellent performance[11].However,the size limitation of single crystals hinders their application in photodetectors[12].

关键词： perovskite polycrystalline hinder

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Cr-containing wastewater treatment based on Cr self-catalysis: a critical review

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Frontiers of environmental science & engineering 2024年第1期18卷 1-22页

作者： Manshu Zhao Xinhua Wang Shuguang Wang Mingming Gao School of Environmental Science and Engineering Shandong UniversityQingdao 266237China Shandong Key Laboratory of Environmental Processes and Health Shandong UniversityQingdao 266237China Shandong Key Laboratory of Water Pollution Control and Resource Reuse Shandong UniversityQingdao 266237China Weihai Research Institute of Industrial Technology of Shandong University Weihai 264209China

Chromium (Cr), as a transition metal material with multiple redox states, has exhibited the catalysis toward Fenton-like reactions over a wide pH range. Although it is not sensible to add Cr reagents as catalysts due to its toxicity, it is highly promising to remediate Cr-containing wastewater through Cr-initiated advanced oxidation processes (Cr-initiated AOPs), which are clean and low-cost. Moreover, the widely concerned Cr-complexes, considered as obstacles in the remediation process, can be effectively destroyed by AOPs. Cr self-catalysis is defined as Cr species is both substrate and catalyst. However, the full understanding of Cr self-catalysis, including the generation of intermediates Cr(IV)/Cr(V), the synergetic effects with co-existing ions, and the accumulation of toxic Cr(VI), remains a challenge for the practical application of Cr-initiated AOPs. In this review, relevant researches on Cr self-catalysis during Cr-initiated AOPs are summarized. Specifically, the Cr-Fenton-like reaction, Cr substituted materials, and Cr-sulfite reactions are explored as key mechanisms contributing to Cr self-catalysis. Moreover, Cr transformation processes, including synchronously Cr removal, Cr redox reactions, and Cr(VI) accumulation, in AOPs-based synergistic systems are systematically analyzed. Detailed approaches for the detection of active species in AOPs-based systems are also presented. The primary objective of this review is to explore the application of AOPs for Cr-containing wastewater remediation based on Cr self-catalysis, and provide fundamental insights and valuable information for future research on Cr-initiated AOPs.

关键词： Self-catalysis Cr-initiated AOPs Cr transformation Cr intermediates Cr-containing wastewater

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Semi-Supervised Contrastive Domain Adaptation Network for Fault Diagnosis of Rotating Machinery Under Cross-Working Conditions

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IEEE Internet of Things Journal 2025年第12期12卷 21552-21564页

作者： Lu, Xingchi Song, Liuyang Han, Changkun Jiang, Quansheng Xu, Weiyang Wang, Huaqing Beijing University of Chemical Technology College of Mechanical and Electrical Engineering Beijing100029 China Suzhou University of Science and Technology School of Mechanical Engineering Suzhou215009 China Jilin University Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Changchun130022 China

Existing domain adaptation (DA) methods, which focus on realizing the class-level alignment for cross-domain features to solve the problem of fuzzy classification boundaries in feature learning process, however, it is difficult to deal with samples located at the classification boundary in this way, resulting in diagnosis performance being limited. To solve the problem, this article proposes a semi-supervised contrastive DA network (SSCDAN) for realizing the cross-working condition rotating machinery fault diagnosis method. Specifically, an in-domain semi-supervised contrastive learning (SSCL) strategy is designed, with the supervision of class information, which guides the discriminative learning of different classes in each domain to eliminate the fuzzy classification boundaries, and facilitates the DA of cross-domain features which utilizes the local maximum mean discrepancy (LMMD). Meanwhile, the negative impact from poor-quality target domain pseudo-labels on SSCL and DA is mitigated by dynamically limiting the associated contrastive learning loss and DA loss gain, and introducing domain adversarial. Finally, the effectiveness of SSCDAN is validated by the ablation and comparison experiments on the Paderborn University (PU) and wind turbine gearbox (WTG) datasets. Compared with deep subdomain adaptation (DSAN), SSCDAN improves the overall average accuracy by 22.43% and 7.36% on the cross-working condition diagnosis tasks of PU and WTG datasets, respectively, and outperforms other popular DA methods. © 2014 IEEE.

关键词： Contrastive Learning

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Phase transformation of Cr(Ⅵ)-adsorbed ferr ihydr ite in the presence of Mn(Ⅱ): Fate of Mn(Ⅱ)and Cr(Ⅵ)

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Journal of environmental sciences 2022年第3期34卷 251-259页

作者： Zecong Ding Guangzhao Sun Fenglian Fu Chujia Ye School of Environmental Science and Engineering Guangdong Key Laboratory of Environmental Catalysis and Health Risk ControlGuangdong University of TechnologyGuangzhou 510006China

Ferrihydrite is an important sink for the toxic heavy metal ions, such as Cr(Ⅵ). As ferrihydrite is thermodynamically unstable and gradually transforms into hematite and goethite, the stability of Cr(Ⅵ)-adsorbed ferrihydrite is environmentally significant. This study investigated the phase transformation of Cr(Ⅵ)-adsorbed ferrihydrite at different pH in the presence of aqueous Mn(Ⅱ), as well as the fate of Mn(Ⅱ) and Cr(Ⅵ) in the transformation process of ferrihydrite. Among the ferrihydrite transformation products, hematite was dominant, and goethite was minor. The pre-adsorbed Cr(Ⅵ) inhibited the conversion of ferrihydrite to goethite at initial pH 3.0, whereas little amount of adsorbed Mn(Ⅱ) favored the formation of goethite at initial pH 7.0. After the aging process, Cr species in solid phase existed primarily as Cr(Ⅲ) in the presence of Mn(Ⅱ) at initial pH 7.0 and 11.0. The aqueous Mn concentration was predominantly unchanged at initial pH 3.0, whereas the aqueous Mn(Ⅱ) was adsorbed onto ferrihydrite or form Mn(OH)_(2) precipitates at initial pH 7.0 and 11.0, promoting the immobilization of Cr(Ⅵ). Moreover, the oxidation of Mn(Ⅱ) occurred at initial pH 7.0 and 11.0, forming Mn(Ⅲ/Ⅳ)(hydr)oxides.

关键词： Ferrihydrite Phase transformation Gr(Ⅵ)adsorption and reduction Mn(Ⅱ)adsorption and oxidation

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Research on the application of defect engineering in the field of environmental catalysis

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Green Energy and Environment 2025年第6期10卷 1187-1209页

作者： Gao, Sirui Zhao, Shunzheng Tang, Xiaolong Sun, Long Li, Qiyu Yi, Honghong School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing100083 China

Researchers have recently developed various surface engineering approaches to modify environmental catalysts and improve their catalytic activity. Defect engineering has proved to be one of the most promising modification methods. Constructing defects on the surface of catalytic materials can effectively modulate the coordination environment of the active sites, affecting and changing the electrons, geometry, and other important properties at the catalytic active sites, thus altering the catalytic activity of the catalysts. However, the conformational relationship between defects and catalytic activity remains to be clarified. This dissertation focuses on an overview of recent advances in defect engineering in environmental catalysis. Based on defining the classification of defects in catalytic materials, defect construction methods, and characterization techniques are summarized and discussed. Focusing on an overview of the characteristics of the role of defects in electrocatalytic, photocatalytic, and thermal catalytic reactions and the mechanism of catalytic reactions. An elaborate link is given between the reaction activity and the structure of catalyst defects. Finally, the existing challenges and possible future directions for the application of defect engineering in environmental catalysis are discussed, which are expected to guide the design and development of efficient environmental catalysts and mechanism studies. © 2025 Institute of Process engineering, Chinese Academy of sciences

关键词： environmental technology

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New Insights into Microplastic Contamination in Different Types of Leachates: Abundances, Characteristics, and Potential Sources

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engineering 2024年第6期37卷 62-68页

作者： Lei Zhang Wentao Zhao Liang Zhang Zhenxiao Cai Ruiqi Yan Xia Yu Damià Barceló Qian Sui State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China PerkinElmer Inc.Shanghai 201203China Maihai Environmental Protection Technology Co. Ltd.SuzhouJiangsu 215000China Department of Environmental Chemistry Institute of Environmental Assessment and Water ResearchSpanish Council for Scientific Research(IDAEA-CSIC)Barcelona 08034Spain

Municipal solid waste(MSW)is an important destination for abandoned *** the waste disposal process,large plastic debris is broken down into microplastics(MPs)and released into the ***,current research only focuses on landfill leachates,and the occurrence of MPs in other leachates has not been ***,herein,the abundance and characteristics of MPs in three types of leachates,namely,landfill leachate,residual waste leachate,and household food waste leachate,were studied,all leachates were collected from the largest waste disposal center in *** results showed that the average MP abundances in the different types of leachates ranged from(129±54)to(1288±184)MP particles per liter(particlesL1)and the household food waste leachate exhibited the highest MP abundance(p<0.05).Polyethylene(PE)and fragments were the dominant polymer type and shape in MPs,*** characteristic polymer types of MPs in individual leachates were ***,the conditional fragmentation model indicated that the landfilling process considerably affected the size distribution of MPs in leachates,leading to a higher percentage(>80%)of small MPs(20–100 lm)in landfill leachates compared to other *** the best of our knowledge,this is the first study discussing the sources of MPs in different leachates,which is important for MP pollution control during MSW disposal.

关键词： Microplastics Landfill leachate Residual waste leachate Household food waste leachate Source

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Resource utilization of typical biomass wastes as biochars in removing plasticizer diethyl phthalate from water: characterization and adsorption mechanisms

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Frontiers of environmental science & engineering 2023年第1期17卷 49-61页

作者： Mei Shi Xiao Wang Mengying Shao Lun Lu Habib Ullah Hao Zheng Fengmin Li Institute of Coastal Environmental Pollution Control College of Environmental Science and EngineeringKey Laboratory of Marine Environment and Ecology(Ministry of Education)Ocean University of ChinaQingdao 266100China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Department of Environmental Science Zhejiang UniversityHangzhou 310058China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China

Plastic pollution as a global environmental issue has become a research hotspot,among which the removal of inherent plasticizer(e.g.,phthalic acid esters,PAEs)received increasing ***,the effects of biochars derived from different feedstocks on the adsorption of PAEs are poorly ***,the characteristics of biochars derived from six largely produced biomass wastes in China at 400°C,as well as their performance in adsorption of diethyl phthalate(DEP),one of frequently detected PAEs in aqueous environment,were *** results indicated that the variation in feedstock type showed significant changes in the properties(e.g.,porosity,specific surface area,surface functional groups)of biochars,which affected DEP adsorption and *** order and Freundlich models fitted the adsorption data well,and adsorption mechanisms mainly included hydrophobic effect,followed by micropore filling,hydrogen bonding,andπ-πEDA *** thermodynamics revealed that the adsorption was a spontaneous and exothermic the adsorption capacities of DEP on these biochars slightly decreased with the increasing pH but increased with the increasing ionic *** these biochars,the giant reed biochar with relatively higher DEP adsorption and low desorption exhibited the great efficiency for DEP removal as an environment-friendly *** results highlighted the significant roles of micropore filling and hydrogen bond in determining adsorption capacity of designed biochars prepared from selecting suitable agricultural straws and wetland plant waste to typical *** findings are useful for producing designed biochars from different biomass wastes for plasticizer pollution control.

关键词： Plastic pollution Phthalic acid esters Designed biochar Wetland plant Adsorption

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Core-shell MnCeO_(x)catalysts for NO oxidation and mild temperature diesel soot combustion

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Journal of Rare Earths 2023年第4期41卷 531-538页

作者： Xiayu Liu Yonghua Guo Qiusheng He Chan Zhang Yan Li School of Environmental Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory for Special Functional Aggregate Materials of Education Ministry School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

environmental contamination such as soot particles and NO_(x)has aroused extensive attraction ***,the main challenge lies in the oxidation of soot at mild temperature with the assistance of NO_(x).Here,a series of core-shell MnCeO_x catalysts were successfully synthesized by hydrothermal method and employed for low-temperature catalytic oxidation of soot in the presence of NO_(x).X-ray diffraction(XRD),inductively coupled plasma-optical emission spectrometry(ICP-OES),energy-dispersive X-ray spectroscopy(EDS),transmission electron microscopy(TEM),N_(2)adsorptio n/deso rption,H_(2)-tempe rature programmed reduction(H_(2)-TPR),O_(2)-temperature programmed desorption(O_(2)-TPD),X-ray photoelectron spectroscopy(XPS)and Raman analyses were conducted for identifying the structure of prepared catalysts and investigating redox properties of the core-shell mixed oxide,which shows excellent performance for NO oxidation and the T_(50)about 350℃for soot ***,soot particle is oxided at 304℃in the presence of NO,while T_(50)augments up to 340℃in the absence of *** the NO_(x)assisted elimination cases of soot,NO_(2)generated from NO in emission gas is generally reckoned as a facilitator which significantly reduces ignition temperature of soot *** catalytic mechanism over core-shell MnCeO_(x)catalysts is also proposed in this paper.

关键词： Catalytic oxidation NO oxidation Soot NO_(x)-assisted MnCeO_(x)catalysts Rare earths

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Uncovering mechanism of photocatalytic performance enhancement induced by multivariate defects on SnS_(2)

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Nano Research 2023年第2期16卷 2102-2110页

作者： Sheng-Qi Guo Bo Yang Zhenzhong Hu Mengmeng Zhen Bingchuan Gu Boxiong Shen Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300401China Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation Huaibei Normal UniversityHuaibei 235000China State Key Laboratory of Particle Detection and Electronics University of Science&Technology of ChinaHefei 230026China

Defect engineering is recognized as an effective route to obtain highly active photocatalytic ***,the current understanding of defects is mainly limited to isolated atomic vacancy defects,ignoring the exploration of the functions of multivariate defects formed by the deletion of several adjacent atoms in photocatalytic ***,we prepared SnS2 nanostructures with the same morphology but different dominant defects,and by testing their photocatalytic performance,it was found that the multivariate defects can significantly improve the photocatalytic performance than isolated S *** experiments and theoretical calculations,we confirmed that the promotion of multivariate defects,especially“S-Sn-S”vacancy associates,on the photocatalytic performance is reflected in many aspects,such as the regulation of the energy band structure,the improvement of the charge separation efficiency,and the promotion of the adsorption and activation of guest ***2 with“S-Sn-S”vacancy associates exhibits excellent photocatalytic water purification *** the induction of“S-Sn-S”vacancy associates,phenol was thoroughly photocatalytically decomposed,further confirming its excellent *** work not only provides new insights into identifying advantage defects in the catalyst structure,but also offers new ideas for constructing highly active photocatalysts based on defect engineering.

关键词： SnS2 multivariate defects photocatalysis pollutants degradation reaction mechanism

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Roles of nanoparticles in arsenic mobility and microbial community composition in arsenic-enriched soils

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Journal of environmental sciences 2024年第4期138卷 301-311页

作者： Ting Luo Qining Zheng Jie Yu Weihao Liang Yan Sun Guixiang Quan Feng Zhou School of Environmental Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Jiangsu Provincial Key Laboratory of Coastal Ecology and Pollution Control Yancheng 224051China School ofEnvironment and Civil Engineering Jiangnan UniversityWuxi 214122China

environmental effects of nano remediation engineering of arsenic(As)pollution need to be *** this study,the roles of Fe_(2)O_(3)and TiO_(2)nanoparticles(NPs)on the microbial mediated As mobilization from As contaminated soil were *** addition of Fe_(2)O_(3)and TiO_(2)NPs restrained As(V)release,and stimulated As(Ⅲ)***(V)concentration decreased by 94% and 93% after Fe_(2)O_(3)addition,and decreased by 89% and 45% after Ti O_(2)addition compared to the Biotic and Biotic+Acetate(amended with sodium acetate)controls,*** maximum values of As(Ⅲ)were 20.5 and 27.1μg/L at 48 d after Fe_(2)O_(3)and TiO_(2)NPs addition,respectively,and were higher than that in Biotic+Acetate control(12.9μg/L).The released As co-precipitated with Fe in soils in the presence of Fe_(2)O_(3)NPs,but adsorbed on TiO_(2)NPs in the presence of TiO_(2)***,the addition of NPs amended with sodium acetate as the electron donor clearly promoted As(V)reduction induced by *** NPs addition changed the relative abundance of soil bacterial community,while Proteobacteria(42.8%-70.4%),Planctomycetes(2.6%-14.3%),and Firmicutes(3.5%-25.4%)were the dominant microorganisms in *** potential As/Fe reducing bacteria were related to Pseudomonas,Geobacter,Desulfuromonas,and *** addition of Fe_(2)O_(3)and TiO_(2)NPs induced to the decrease of arr A *** results indicated that the addition of NPs had a negative impact on soil microbial population in a long *** findings offer a relatively comprehensive assessment of Fe_(2)O_(3)and TiO_(2)NPs effects on As mobilization and soil bacterial communities.

关键词： Fe_(2)O_(3)and TiO_(2)nanoparticles Arsenic reduction Mobilization Functional gene Microbial community

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