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La/Ce-codoped Bi_2O_3 composite photocatalysts with high photocatalytic performance in removal of high concentration dye

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Journal of Environmental Sciences 2017年第10期29卷 70-77页

作者： Shuangshuang Xue Hongbo He Qizhe Fan changlin yu Kai Yang Weiya Huang Yang Zhou yu Xie School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology College of Environment and Chemical Engineering Nanchang Hangkong University

A series of La/Ce-codoped Bi2O3 composite photocatalysts were fabricated via hydrothermal–calcination process. The as-prepared products were intensively characterized by some physicochemical characterizations like N2 physical adsorption, X-ray powder diffraction（XRD）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, UV–Vis diffuse reflectance（UV–Vis DRS）, Fourier transform infrared spectroscopy（FT-IR）,photoelectrochemical measurements, and photoluminescence（PL） spectroscopy. The characterization results indicated that La and Ce doping induced obvious crystal phase transformation in Bi2O3, from monoclinic to tetragonal phase. La and Ce codoping also gave rise to the obvious synergetic effects, e.g., the lattice contraction of Bi2O3, the decrease of crystal size and the increase of surface area. The photocatalytic performance of the prepared catalysts was evaluated by removal of dye acid orange II with high concentration under visible light irradiation. Results showed that La/Ce-codoped Bi2O3 displayed much higher photocatalytic performance than that of bare Bi2O3, single La or Ce doped Bi2O3 samples. The superior photocatalytic activity was mainly attributed to the improved texture and surface properties and the synergistic effects of La and Ce codoping on suppressing the recombination of photo-generated electrons（e^-） and holes（h~＋）.

关键词： Bi2O3 crystal La Ce codoping Phase transformation Dye removal Photocatalysis

Preparation,characterization and photocatalytic performance of Mo-doped ZnO photocatalysts

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Science China Chemistry 2012年第9期55卷 1802-1810页

作者： yu changlin YANG Kai SHU Qing yu Jimmy C CAO FangFang LI Xin ZHOU XiaoChun School of Metallurgy and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Fujian Provincial Key Laboratory of Photocatalysis--State Key Laboratory Breeding Base Fuzhou UniversityFuzhou 350002China Department of Chemistry The Center of Novel Functional Molecules and Environmental Science ProgrammeThe Chinese Universiry of Hong KongShatinNew TerritoriesHong KongChina

A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grind- ing-calcination method. The structure of these photocatalysts was characterized by a variety of methods, including N2 physical adsorption, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared （FT-IR） spectroscopy, photoluminescence （PL） emission spectroscopy, and UV-vis diffuse reflectance spectroscopy （DRS）. It was found that Mo6＋ could enter into the crystal lattice of ZnO due to the radius of MO6＋（0.065 nm） being smaller than that of Zn2＋（0.083 nm）. XRD results indicated that Mo6＋ suppressed the growth of ZnO crystals. The FT-IR spectroscopy results showed that the ZnO with 2 wt.% Mo-doping has a higher level of surface hydroxyl groups than pure ZnO. PL spectroscopy indicated that ZnO with 2 wt.% Mo-doping also exhibited the largest reduction in the intensity of the emission peak at 390 nm caused by the recombi- nation of photogenerated hole-electron pairs. The activities of the Mo-doped ZnO photocatalysts were investigated in the pho- tocatalytic degradation of acid orange II under UV light （2 = 365 nm） irradiation. It was found that ZnO with 2 wt.% Mo-doping showed much higher photocatalytic activity and stability than pure ZnO. The high photocatalytic performance of the Mo-doped ZnO can be attributed to a great improvement in the surface properties of ZnO, higher crystallinity and lower recombination rate of photogenerated hole-electron （e-/h＋） pairs. Moreover, the undoped Mo species may exist in the form of MoO3 and form MoO3/ZnO heterojunctions which further favors the separation of e/h＋ pairs.

关键词： ZnO Mo doping e-/h+ pairs photocataiysis acid orange II

Three-dimensional oxygen-doped porous graphene:Sodium chloridetemplate preparation,structural characterization and supercapacitor performances

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Chinese Journal of Chemical Engineering 2021年第12期34卷 304-314页

作者： Zesheng Li Bolin Li Lijun Du Weiliang Wang Xichun Liao Huiqing yu changlin yu Hongqiang Wang Qingyu Li College of Chemistry Guangdong University of Petrochemical TechnologyMaoming 525000China Guangxi Key Laboratory of Low Carbon Energy Materials Guangxi Normal UniversityGuilin 541004China

Supercapacitor is a new type of energy storage device,which has the advantages of high-power property and long cycle *** this study,three-dimensional graphene(3 D-GN)with oxygen doping and porous structure was prepared from graphene oxide(GO)by an inexpensive sodium chloride(NaCl)template,as a promising electrode material for the *** structure,morphology,specific surface area,pore size,of the sample were characterized by XRD,SEM,TEM and BET *** electrochemical performances of the sample were tested by CV and CDC *** 3 D-GE product is a threedimensional nano material with hierarchical porous structures,its specific surface area is much larger than that of routine stacked graphene(GN),and it contains a large number of mesoporous and macropores,a small amount of *** capacitance characteristics of the 3 D-GN electrode material are excellent,showing high specific capacitance(173.5 F·g^(-1)at 1 A·g^(-1)),good rate performance(109.2 F·g^(-1)at 8 A·g^(-1))and long cycle life(88%capacitance retention after 10,000 cycles at 8 A·g^(-1))

关键词： 3-D porous graphene Template preparation Sodium chloride Supercapacitor

Experimental and mechanistic understanding of photo-oxidation of methanol catalyzed by CuO/TiO2-spindle nanocomposite:Oxygen vacancy engineering

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Nano Research 2020年第4期13卷 939-946页

作者： Quanquan Shi Zhaoxian Qin changlin yu Ammara Waheed Hui Xu Yong Gao Hadi Abroshan Gao Li College of Science Inner Mongolia Key Laboratory of Soil Quality and Nutrient ResourceInner Mongolia Agricultural UniversityHohhot 010018China School of Chemical Engineering Key Laboratory of Petrochemical Pollution Process and Control Guangdong ProvinceGuangdong University of Petrochemical TechnologyMaomirtg 525000China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Chemistry and Biochemistry Georgia Institute of TechnologyAtlantaGeorgia 30332USA

We report experimental and mechanistic understanding of methanol oxidation to produce methyl formate using CuO/Ti02-spindle composite as a promising photocatalyst under mild conditions with over 97%conversion and 83%*** catalysts are obtained via precise depositing of CuO nanoclusters(size:~3.5 nm)at the{101}facet of the TiO2 to optimally tune exciton recombination through oxygen vacancies generation,evidenced by photoluminescence and Raman spectroscopy *** turnover frequency(TOF)and the apparent quantum efficiency(AQE)of the 7%CuO/TiO2-spindle composites reach up to 23.8 molmethanol·gcat^-1·h^-1 and 55.2%at 25℃,respectively,which are substantially higher than these previously reported ***,the in-situ attenuated total reflection infrared spectroscopy analysis reveals that the methanol oxidation most likely takes place through the conversion of adsorbed methoxy(CH30^*)to formaldehyde(CHO^*)intermediate,a subject of major debate for a long *** adsorbed formaldehyde(CHO^*)thus produced reacts with another CH30^*species in its close proximity to form the final product of methyl *** of this study provide insights into the reaction mechanism,and offer guidelines to systematically develop and apply photocatalysts for methanol conversion and related reactions via surface engineering.

关键词： CuO/Ti02 nanocomposite methyl formate in-situ attenuated total reflection infrared spectroscopy photocatalysis oxygen vacancy methanol

Additive effects of alkaline-earth metals and nickel on the performance of Co/γ-Al_2O_3 in methane catalytic partial oxidation

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Journal of Natural Gas Chemistry 2011年第2期20卷 135-139页

作者： changlin yu Weizheng Weng Qing Shu Xiangjie Meng Bin Zhang Xirong Chen Xiaochun Zhou School of Materials and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 Jiangxi China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen 361005 Fujian China

Nano-sized γ-alumina （γ-Al2O3） was first prepared by a precipitation method. Then, active component of cobalt and a series of alkaline- earth metal promoters or nickel （Ni） with different contents were loaded on the γ-Al2O3 support. The catalysts were characterized by N2 adsorption-desorption, X-ray diffraction （XRD） and thermogravimetry analysis （TGA）. The activity and selectivity of the catalysts in catalytic partial oxidation （CPO） of methane have been compared with Co/γ-Al2O3, and it is found that the catalytic activity, selectivity, and stability are enhanced by the addition of alkaline-earth metals and nickel. The optimal loadings of strontium （Sr） and Ni were 6 and 4 wt%, respectively. This finding will be helpful in designing the trimetallic Co-Ni-Sr/γ-Al2O3 catalysts with high performance in CPO of methane

关键词： alkaline-earth metal cobalt-based catalyst γ-alumina catalytic partial oxidation methane

A Lamellar Ceria Structure with Encapsulated Platinum Nanoparticles

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Nano Research 2008年第6期1卷 474-482页

作者： Angelo C.Mak changlin yu Jimmy C.yu Zhendong Zhang Chunman Ho Department of Chemistry The Center of Novel Functional Moleculesand Environmental Science ProgrammeThe Chinese University of Hong KongShatinNew TerritoriesHong KongChina

A novel lamellar feather-like CeO_(2) structure has been fabricated by using a triblock copolymer as the structure-directing *** material was characterized in detail by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray photoelectron spectroscopy,and BET surface area *** with conventional spherical shaped ceria prepared by ammonia gelation,the ceria feathers have superior ability to support nanosized platinum particles due to their special ***“skeletons”of ceria feathers can serve as an ideal host matrix to anchor the platinum ***,the inter-crossing pattern of the“skeletons”also acts as a partition to separate platinum particles,allowing the Pt nanoparticles(average diameter~6 nm)to be highly dispersed in the *** Pt/feather-like CeO_(2) catalyst exhibits high activity in the water gas shift reaction.

关键词： Ceria nanostructure platinum nanoparticles surfactant-controlled synthesis water gas shift reaction

High value-added fluorescence upconversion agents-assisted nanosemiconductors for efficient wide spectral response photocatalysis:Exerting energy transfer effect and applications

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Journal of Rare Earths 2021年第3期39卷 243-260,I0001页

作者： Kailian Zhang Man Zhou changlin yu Xiaoxiao Li Kai Yang Shi Yang Wenxin Dai Weiya Huang Qizhe Fan Lihua Zhu School of Chemistry and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Pharmaceutical Sciences Gannan Medical UniversityGanzhou 341000China School of Chemical Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China Key Laboratory of Green Energy and Environment Catalysis(Ningde Normal University) Fujian Province UniversityNingde 352100China Research Institute of Photocatalysis State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350002China

The design of the photocatalytic materials has made a great of remarkable progress in the area of the enhancement photocatalytic activity,but there are still lots of problems such as wide band gap,low utilization of sunlight,low quantum efficiency and poor stability,which further limit the extensive practical ***,it is a hot research topic and key scientific problem to be solved that how to design and prepare the catalysts,which can respond to visible and near-infrared light in *** by efficient nonlinear optical upconversion materials,upconversion-based nanocomposites can indirectly broaden the absorption ranges of semiconductors by co nverting the captured long-band visible and near-infrared incident light into high-energy short-band visible or ultraviolet light,which can be adopted as the promising candidate in wide-spectral-light-activating photocatalytic materials coupling with conventional *** to our recent works and literature reports,recent review summarizes the research progress of photocatalytic materials with upconversion effect on photolysis of water for hydrogen production,degradation of organic and inorganic pollutants,reduction of CO_(2) and photodynamic *** prepared nanocomposites can suppress the recombination of electrons and holes,and greatly improve the photocatalytic efficiency by the synergistic *** maybe stimulates a great interest in rational design and preparation of efficient full-spectrum photocatalytic systems and their wide application in solar energy conversion.

关键词： Fluorescence upconversion Hydrogen production Photocatalysis Treatment of pollutants Photodynamic therapy Rare earths

Novel Ni/CeO_2-Al_2O_3 composite catalysts synthesized by one-step citric acid complex and their performance in catalytic partial oxidation of methane

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Journal of Energy Chemistry 2014年第2期23卷 235-243页

作者： changlin yu Jiubiao Hu Wanqin Zhou Qizhe Fan School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology School of Information Engineering Jiangxi University of Science and Technology

A series of novel Ni/CeOe-Al2O3 composite catalysts were synthesized by one-step citric acid complex method, The as-synthesized catalysts were characterized by N2 physical adsorption/desorption, X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） spectroscopy, hydrogen temperature-programmed reduction （Hz-TPR）, X-ray photoelectron spectroscopy （XPS） and thermogravimetry analysis （TGA）. The effects of nickel content, calcination and reaction temperatures, gas hourly space velocity （GHSV） and inert gas dilution of N2 on their performance of catalytic partial oxidation of methane （CPOM） were investigated. Catalytic activity test results show that the highest methane conversion （〉85%）, the best selectivities to carbon monoxide （〉87%） and to hydrogen （〉95%）, the excellent stability and perfect Hz/CO ratio （2.0） can be obtained over Ni/CeO2-Al2O3 with 8 wt% Ni content calcined at 700 ℃ under the reaction condition of 750 ℃, CH4/O2 ratio of 2 ： 1 and gas hourly space velocity of 12000 mL.h-1 .g-1. Characterization results show that the good catalytic performance of this composite catalyst can be contributed to its large specific surface area （~108 m2.g-1）, small crystallite size, easy reducibility and low coking rate.

关键词： citric acid complex ceria-alumina composite oxide nickel reduction catalytic partial oxidation or methane

Intellectual Property Policy and County Economic Growth:A Quasi-natural Experiment from the Intellectual Property Powering County Project

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China & World Economy 2024年第6期32卷 35-67页

作者： changlin yu Bing Shen Center for Macroeconomic Research Paula and Gregory Chow Institute for Studies in EconomicsXiamen UniversityChina Paula and Gregory Chow Institute for Studies in Economics Xiamen UniversityChina

As fundamental economic units,county economies play a crucial role in China's national economic ***,it remains unclear whether intellectual property rights policies at the county level can promote economic *** used a quasi-natural experiment from the Intellectual Property Powering County Project("the Project")to measure their impact on county economic growth from 2009 to 2020,applying a multi-period diference-in-differences *** economic growth indicators were measured using Enhanced Vegetation Index-calibrated nighttime light data from the Defense Meteorological Satellite Program and Visible Infrared Imaging Radiometer *** findings demonstrated that the Project promoted economic growth significantly by incentivizing innovation,attracting high-tech and new-tech enterprises,and fostering brand *** Project also exhibited significant heterogeneity across districts and counties,along with spillover effects on economic growth in surrounding counties within approximately 80 kilometers.

关键词： brand creation county economic growth innovation Intellectual Property Powering County Project spillover effects