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Effects of hydrothermal temperature on formation and decoloration characteristics of anatase TiO_2 nanoparticles

Science China(Technological Sciences) 2012年第4期55卷 894-902页

作者： LU HongBin ZHOU YouZhen VONGEHR Sascha TANG ShaoChun MENG XiangKang National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringNanjing UniversityNanjing 210093China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Department of Materials EngineeringYancheng Institute of TechnologyYancheng 224003China

This paper describes the effects of temperature on the complex intermediate processes from the precursor to the fully-crystallized anatase TiO2 nanoparticles in hydrothermal synthesis. The anatase TiO2 nanoparticles were synthesized in a wide temperature range below 230°C. The composition, morphology, and methylene blue (MB) decoloration characteristics of the obtained products were investigated by X-ray diffraction, Fourier transform infrared spectroscope, X-ray photoelectron spectroscope, and scanning and transmission electron microscope. The dehydrating polycondensation of Ti(IV)-hydrates and the decomposition of (NH4)2Ti3O7 intermediates with the temperature increase lead to the direct formation of anatase TiO2 nanoparticles under the hydrothermal environments. The strong MB decoloration of the hydrothermal products obtained at the low (≤130°C) and high (≥180°C) temperatures are attributed to the adsorption of Ti(IV)-hydrates and the photocatalysis of anatase TiO2 nanoparticles, respectively.

关键词： anatase TiO2 nanoparticles hydrothermal synthesis decoloration adsorption photocatalysis

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Effects of local matrix environment on the spectroscopic properties of ensemble to single-particle level carbon dots

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Chinese Chemical Letters 2022年第2期33卷 751-756页

作者： Zhihong Wei Boyang Wang Mingcai Xie Daocheng Hong Xin Yang Sushu Wan Weiqing Yang Siyu Lu Yuxi Tian Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringJiangsu Key Laboratory of Vehicle Emissions ControlNanjing UniversityNanjing 210023China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China

Carbon dots(CDs), because of their unique properties, are being rapidly developed as important luminescent materials for imaging, sensing, and use in photonic devices. However, most of the reported fundamental properties of the CDs are results of investigations conducted in the solution state, which may be completely different from those conducted in the solid state. In this work, we study the luminescence properties, photostability, and the dynamics of CDs in different matrix environments, from ensemble to the single-particle level. We observed that the properties associated with the emission centers and photostability of CDs were extremely sensitive to the local chemical environment. A better understanding of the dependence of the spectroscopic properties of CDs on the complex local chemical environment is an important step toward finding new ways of controlling the optical properties of CDs and optimizing their use in various applications.

关键词： Carbon dots Matrix effects Single-particle Photostability Blinking

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Synthesis, Characterization and Evaluation of Sulfur Transfer Catalysts for FCC Flue Gas

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China Petroleum Processing & Petrochemical technology 2014年第2期16卷 59-64页

作者： Jiang Ruiyu Shan Honghong Zhang Jiling Yang Chaohe Li Chunyi Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) East-China Design Branch China Petroleum Engineering Construction Corporation

In this work, Zr-M(M=Cu, Mn, Ce) type sulfur transfer agent was prepared by impregnation method. Under the condition similar to that in the regenerator of FCC units, the influence of different active metal components and their contents on sulfur transfer agent were investigated. Moreover, the crystalline structure of sulfur transfer agent was characterized by X-ray diffraction(XRD) and Fourier transforms infrared spectroscopy(FT-IR). The result showed that the Zr-Mn sulfur transfer agent could effectively reduce the SO2 content in FCC regenerator flue gas, featuring high SO2 adsorption capacity. The sulfur transfer agent was inactivated in 40—60 min during the test. In the course of reduction reaction, after several reaction cycles, the formation of SO2 ceased and only H2 S was detected as the reduction product.

关键词： fluid catalytic cracking sulfur-transfer catalyst flue gas zirconium

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Influence of substrates on the preparation of hydrophilic and oleophobic materials: A review of recent advances

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Materials Today Communications 2025年 46卷

作者： Yuan, Yuting Li, Sen Yu, Xiaofang Wang, Yuanhao School of Geography and Environmental Sciences Guizhou Normal University Guiyang550000 China Guizhou Normal University National Key Laboratory Breeding Base of Karst Mountain Ecological Environment in Guizhou Province Guiyang550000 China Center of R&D Guizhou Merit Environmental Technology Co. Ltd Guiyang550000 China Center of R&D Guizhou Wantong Environmental Protection Engineering Co. Ltd Guiyang550000 China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University Shenzhen518055 China

The escalating production of oily wastewater poses a significant peril to both the natural environment and human health, as well as a serious waste of resources, so the cost-effective realization of water purification, as well as the recovery of oil resources by using oil-water separation material technology, has become a worldwide research hot spot. Materials with special wettable surfaces have come into the limelight because of their ease of operation, energy conservation and environmental protection. In addition, the water phase passes through more easily than the oil phase, and the oil phase is more likely to cause material contamination, so materials exhibiting hydrophilic and oleophobic properties have undergone extensive development and have found broad applications in the field of oil-water separation processes. This article commences with an introduction to the theory of wettability, along with crucial characterization methods pertinent to hydrophilic and oleophobic materials. Then a systematic review of the recent progress in the preparation of hydrophilic and oleophobic materials using organic materials, inorganic materials, and organic-inorganic blended materials as substrates is presented, with detailed descriptions of the preparation methods, separation properties, and multifunctionality of each material, summarizing the advantages and shortcomings of the hydrophilic and oleophobic materials prepared with different substrates. Finally, the paper provides an outlook on their future development. © 2025 Elsevier Ltd

关键词： Polymeric membranes

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Coupling Ga(OH)₃ and chromate as a universal cocatalyst for CO₂ photoreduction by H₂O

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Catalysis Today 2025年 458卷

作者： Xu, Xuanwen Lu, Yuehao Wang, Shuying Fan, Lele Dong, Pengyu Wang, Zheng Jiang, Ruiyu Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Yancheng 224051 China School of Chemistry and Chemical Engineering Yancheng Institute of Technology Yancheng 224051 China School of Mechanics and Safety Engineering Zhengzhou University 100 Kexue Road Henan Zhengzhou 450001 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Development of effective and universal cocatalysts are very important to the photocatalytic conversion of CO2 by H2O. Herein, CO evolution from this reaction was successfully promoted by co-catalytic coupling featurin... 详细信息

Development of effective and universal cocatalysts are very important to the photocatalytic conversion of CO₂ by H₂O. Herein, CO evolution from this reaction was successfully promoted by co-catalytic coupling featuring Ga(OH)₃ loading onto photocatalyst surfaces and in situ addition of Na₂CrO₄. This strategy exhibited excellent universality for a series of Ta- and Ga-based photocatalysts. Modifications of Ga(OH)₃ created active sites for CO production on the photocatalyst surfaces. The in situ addition of Na₂CrO₄ improved CO evolution activity when two factors were satisfied: (1) active sites for CO evolution were created using the proper cocatalysts and (2) the photocatalyst surfaces were sufficiently quenched by hydroxide ions. © 2025 Elsevier B.V.

关键词： CO CO2 Ga(OH)3 Na2CrO4 NaTaO3

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Synthesis and characterization of Co_3O_4 prepared from atmospheric pressure acid leach liquors of nickel laterite ores

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 20-27页

作者： Long Meng Zhan-cheng Guo Jing-kui Qu Tao Qi Qiang Guo Gui-hua Hou Peng-yu Dong Xin-guo Xi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Zhengzhou Institute of Emerging Technology Industries Zhengzhou 450000China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China Jiangsu Collaborative innovation Center for Ecological Building Materials and Environmental Protection Equipments Yancheng Institute of TechnologyYancheng 224051China

A chemical precipitation-thermal decomposition method was developed to synthesize Co3O4 nanoparticles using cobalt liquor obtained from the atmospheric pressure acid leaching process of nickel laterite ores. The effects of the precursor reaction temperature, the concentration of Co2＋, and the calcination temperature on the specific surface area, morphology, and the electrochemical behavior of the ob- tained Co304 particles were investigated. The precursor basic cobaltous carbonate and cobaltosic oxide products were characterized and ana- lyzed by Fourier transform infrared spectroscopy, thermogravimetric differential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, specific surface area analysis, and electrochemical analysis. The results indicate that the specific surface area of the Co3O4particles with a diameter of 30 rim, which were obtained under the optimum conditions of a precursor reaction temperature of 30℃, 0.25 mol/L Co2＋, and a calcination temperature of 350℃, was 48.89 m2/g. Electrodes fabricated using Co3O4 nanoparticles exhibited good electrochemical properties, with a specific capacitance of 216.3 F/g at a scan rate of 100 mV/s.

关键词： nickel laterite ores, acid leach liquors synthesis cobaltosic oxide characterization

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One-step Condensation/copolymerization of VTES and DVB for Self-assembly Bionic Superhydrophobic Surface Coating and Study on Oil-water Separation

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Journal of Bionic Engineering 2021年第3期18卷 559-573页

作者： Ruilong Zhang Zhiping Zhou Yi Wang Xiaohui Dai Li Chen Jiangdong Dai Research School of Polymeric Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 2120133China State Key Laboratory of NBC Protection for Civilian Beijing 102205China Institute of Green Chemistry and Chemical Technology Advanced Chemical Engineering Laboratory of Green Materials and Energy of Jiangsu ProvinceSchool of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China

Mimicry of nature drives the development of bionic *** superhydrophobic materials are a kind of high-efficiency materials to handle oil spills and water ***,the stability of surface coatings of the superhydrophobic materials remains a ***,a new category of self-assembly bionic superhydrophobic surface coating was prepared via one-step condensation/copolymerization of vinyltriethoxysilane(VTES)and divinylbenzene(DVB),which realized the close combination of covalent bonds between organic(***)and inorganic matter(***),and avoided the swelling of polydivinylbenzene(PDVB)in the process of collection of oil from *** organic-inorganic hybrid polymer could self-assembly deposit on the surface of sponge even other *** example,P(VTES-DVB)-Si0_(2)/MS obtained by assembling P(VTES-DVB)-Si0_(2)on the surface of Melamine Sponge(MS)exhibited superhydrophobicity with a Water Contact Angle(WCA)of 157.3,the optimal adsorption capacity of 77 g g 136 g g-1 for diverse oils,and an excellent separation efficiency of 99.3%.Besides,the excellent acid and alkali resistance of P(VTES-DVB)-Si0_(2)/MS suggested the potential value in practical oil-water separation.P(VTES-DVB)-Si0_(2)showed the outstanding hydrophobic performance by using as coating on different *** work provided a new idea about the stable combination of organic and inorganic matter in the surface modification.

关键词： superhydrophobic surface coating oil-water separation condensation copolymerization self-assembly organic-inorganic hybridism

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Structures, mobilities, electronic and magnetic properties of point defects in silicene

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Nanoscale 2013年第20期5卷 9785-9792页

作者： Gao, Junfeng Zhang, Junfeng Liu, Hongsheng Zhang, Qinfang Zhao, Jijun Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Ministry of Education Dalian 116024 China Beijing Computational Science Research Center Beijing 100084 China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu 224051 China

In the fabrication and processing of silicene monolayers, structural defects are almost inevitable. Using ab initio calculations, we systemically investigated the structures, formation energies, migration behaviors and electronic/magnetic properties of typical point defects in silicene, including the Stone-Wales (SW) defect, single and double vacancies (SVs and DVs), and adatoms. We found that SW can be effectively recovered by thermal annealing. SVs have much higher mobility than DVs and two SVs are very likely to coalesce into one DV to lower the energy. Existence of SW and DVs may induce small gaps in silicene, while the SV defect may transform semimetallic silicene into metallic. Adatoms are unexpectedly stable and can affect the electronic properties of silicene dramatically. Especially, Si adatoms as self-dopants in silicene sheets can induce long-range spin polarization as well as a remarkable band gap, thus achieving an all-silicon magnetic semiconductor. The present theoretical results provide valuable insights into identification of these defects in experiments and understanding their effects on the physical properties of silicene. © The Royal Society of Chemistry 2013.

关键词： Silicene

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Dynamics of Kerr cavity solitons in fiber resonators driven by desynchronized pulses

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Physical Review A 2025年第5期111卷 053519-053519页

作者： Hongbin Hu Runhui Zhu You Yu Zhiqiang Wang Zuxing Zhang Advanced Photonic Technology Laboratory College of Electronic and Optical Engineering and College of Microelectronics Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China National Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology Hefei Anhui 230039 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University Hefei Anhui 230039 China

The pulsed driving of passive fiber Kerr resonators is an effective approach to generating coherent optical soliton combs with high efficiency. Desynchronization, which is defined as the frequency mismatch between the pumping pulse repetition rate and the cavity round-trip time, is an additional system variable, making the nonlinear system of fiber resonators more complex. Research on the relevant physics of desynchronization is not yet comprehensive. In this article, the complex dynamics of Kerr cavity solitons in a pulsed-pumped normal dispersion fiber Kerr resonator with third-order dispersion (TOD) and desynchronization is studied in simulations. We find that the desynchronization effect plays a critical role in the formation of Kerr cavity solitons. Interestingly, the introduction of desynchronization leads to the formation of breathing Kerr cavity solitons before the onset of stable operation of Kerr cavity solitons. The competition and balance between TOD and desynchronization determine the behavior of Kerr cavity solitons. Without TOD, a strong desynchronization effect results in a breathing state with a sliding shift of pulse peak position. In contrast, a slight desynchronization effect causes the periodic oscillation of pulse peak power without changing the pulse location. The breathing period depends on the absolute value of desynchronization coefficient and the sliding direction is related to the sign of the desynchronization coefficient. Furthermore, a reversible switching between different nonlinear Kerr cavity soliton states is achieved by changing the degree of desynchronization, suggesting that the desynchronization can be used as an additional degree of freedom to control the Kerr cavity soliton dynamics in Kerr resonators. These findings enrich our understanding of Kerr cavity solitons and provide important references for improving the stability of Kerr cavity solitons and the application of efficient resonator frequency combs.

关键词： Solitons

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Studying the loading impact of silane grafted Fe ₂ O ₃ nanoparticles on mechanical characteristics of epoxy matrix

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Egyptian Journal of Petroleum 2019年第1期28卷 27-34页

作者： Naguib, Hamdy M. Ahmed, Mona A. Abo-Shanab, Z.L. Department of Petroleum Applications Egyptian Petroleum Research Institute (EPRI) Nasr City Cairo 11727 Egypt Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Yancheng 224051 Jiangsu Province China

This study investigates the loading impact of iron oxide (IO) and silane treated iron oxide (SIO) nanoparticles on thermal, mechanical and morphological behavior of epoxy matrix. Both IO and SIO nanoparticles were loaded with 1, 3 and 5 wt% from the total weight of epoxy matrix. The morphology of IO, and SIO epoxy nanocomposites are investigated by TEM. FTIR spectra are successfully able to confirm the good chemical interaction between SIO nanoparticles and epoxy matrix. Thermal resistance of epoxy IO, and SIO nanocomposites is studied by TGA. The mechanical properties of prepared nanocomposites including storage modulus, tan δ, stress-strain curves and toughness are studied using DMA at temperature range 25 °C–100 °C. The results approved that loading 3 wt% of SIO nanoparticles improved the morphological, thermal resistance and mechanical characteristics of epoxy matrix. © 2019 Egyptian Petroleum Research Institute

关键词： Epoxy nanocomposites Iron oxide nanoparicles Modulus Thermal stability Toughness

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