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Facile synthesis of hierarchical NiO/NiFe_(2)O_(4) microsphere composite as efficient visible photocatalyst for 2,4-DCP degradation

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Rare Metals 2024年第4期43卷 1580-1588页

作者： Shabana Shaheen Shuai Xu Ji Bian Amir Zada Zi-Qing Zhang Yang Qu Li-Qiang Jing Key Laboratory of Functional Inorganic Materials Chemistry(Ministry of Education) International Joint Research Center and Lab for Catalytic TechnologySchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin150080China Department of Chemistry Abdul Wali Khan UniversityMardan23200Pakistan

It is highly desired to develop efficient photocatalysts with recycling property for practical application to degrade toxic ***,nanosheet-assembled NiFe_(2)O_(4)microspheres with commendable activity are successfully synthesized by a facile solvothermal reaction with NH4F as the modifier,and their photoactivities are further improved by coupling with NiO through an in situ growth *** optimized nickel oxide(NiO)/nickel ferrite(NiFe_(2)O_(4))microsphere composite(5NiO/NFO-4)exhibits a satisfactory photocatalytic activity for 2,4-dichlorophenol(2,4-DCP)degradation under visible-light irradiation,which is attributed to its wide visible-light response,well-designed hierarchical structure and enhanced charge transfer and separation by coupling NiO as a high-level energy platform to accept ***,it is found that the NiO/NiFe_(2)O_(4)microsphere photocatalysts can be easily collected and recycled owing to the distinctive magnetic *** work provides a feasible route to rational design visible-light-driven photocatalysts with high-activity for environmental remediation and purification with good recyclability.

关键词： NiFe_(2)O_(4) microspheres NiO/Fe_(2)O_(4) composite Charge separation Visible-light photocatalysis 2 4-Dichlorophenol degradation

Circularly polarized luminescence switch based on a photochromic europium(Ⅲ) helicate derived coordination polymer

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Chinese Chemical Letters 2024年第2期35卷 272-277页

作者： Mei Li Yanyan Zhou Jingya Li Wenru Huang Zhiwei Yao Yuying Li Ting Gao Pengfei Yan Hongfeng Li Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China State Key Laboratory of Baiyunobo Rare Earth Resource researches and Comprehensive Utilization Institution Baotou 014030China

Chiroptical switches based on circularly polarized luminescence(CPL)have shown the promising applications in advanced information ***,a pair of lanthanide coordination polymer enantiomers[Eu_(2)(L^(R))_(3)(BTFPO)_(2)]_(n) and[Eu_(2)(L^(S))_(3)(BTFPO)_(2)]_(n) with light-regulated CPL property are designed,which are assembled by a chiral binuclear triple-stranded Eu^(3+) helicates[Eu_(2)(L^(R/S))_(3)]coordinated with two photochromic triphenylphosphine oxides(BTFPO).Upon the alternative UV and 526 nm light irradiation,the complexes show the reversible photochromism,PL and CPL ***,the luminescence dissymmetry factor,g lum of ^(5)D_(0)→^(7)F_(1)(591 nm)transition shows an obvious increase from 0.19 to 0.29 before and after 275 nm light ***,the emission from Eu^(3+) center is not completely quenched in closed-ring state due to the low photocyclization(Ф_(o-c))quantum yield of the *** partial maintenance of emissive intensity is of essential importance for the monitor of CPL *** importantly,the CPL photo-switching property of the complexes in solid hybrid film is maintained,and still displays the enhanced CPL emission in photostationary ***,the potential applications of the doping film in logic gate and anti-counterfeiting were investigated.

关键词： Chiroptical switches Coordination polymer CPL Anti-counterfeiting Logic gate

STRONG CONVERGENCE OF THE EULER-MARUYAMA METHOD FOR A CLASS OF STOCHASTIC VOLTERRA INTEGRAL EQUATIONS

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Journal of Computational Mathematics 2022年第4期40卷 607-623页

作者： Wei Zhang School of Mathematical Sciences Heilongjiang UniversityHarbin 150080China

In this paper,we consider the Euler-Maruyama method for a class of stochastic Volterra integral equations(SVIEs).It is known that the strong convergence order of the EulerMaruyama method is ***,the strong superconvergence order 1 can be obtained for a class of SVIEs if the kernelsσi(t,t)=0 for i=1 and 2;otherwise,the strong convergence order is ***,the theoretical results are illustrated by some numerical examples.

关键词： Strong convergence Stochastic Volterra integral equations Euler-Maruyama method Lipschitz condition

Passively Q-switched operation of a 1.94μm thulium-doped solid-state laser based on MXeneV_(2)CT_(x)

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Chinese Optics Letters 2023年第2期21卷 40-44页

作者：袁晋鹤李佳睿吴政阳李双成韩杰李林军 College of Physical Science and Technology Heilongjiang UniversityHarbin 150080China heilongjiang Provincial Key Laboratory of Laser Spectroscopy Technology and Application Harbin University of Science and TechnologyHarbin 150080China School of Data Science and Technology Heilongjiang UniversityHarbin 150080China

MXene V_(2)CT_(x) has great practicability because it is not easy to degrade under ambient *** this paper,a V_(2)CT_(x) saturable absorber(SA)was firstly applied to a passively Q-switched(PQS)laser,to the best of our *** V_(2)CT_(x)-SA was prepared by the spin-coating *** linear absorption of the V_(2)CT_(x)-SA in the 1000-2200 nm region and the nonlinear absorption near 2μm were *** the V_(2)CT_(x)-SA,a typical PQS operation at 1.94μm was realized in a Tm:*** minimum pulse width produced by the PQS laser was 528 ns,and the peak power,repetition rate,and average output power were 10.06 W,65.9 kHz,and 350 mW,***,the maximum pulse energy was 6.33μ*** work demonstrates that the V_(2)CT_(x) can be used as an effective SA to obtain nanosecond pulses with high peak power and high repetition rate simultaneously.

关键词： passive Q-switching MXene V2CTx saturable absorber thulium doping

Comparative study of metal oxides and phosphate modification with different mechanisms over g-C_(3)N_(4) for visible-light photocatalytic degradation of metribuzin

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Rare Metals 2022年第1期41卷 155-165页

作者： Rui Yan Amir Zada Lei Sun Zhi-Jun Li Zhi-Yuan Mu Shuang-Ying Chen Fan Yang Jian-Hui Sun Lin-Lu Bai Yang Qu Li-Qiang Jing Key Laboratory of Functional Inorganic Materials Chemistry School of Chemistry and Material SciencesHeilongjiang UniversityHarbin 150080China Key Laboratory of Photochemical Biomaterials and Energy Storage Materials College of Chemistry and Chemical EngineeringHarbin Normal University A.Zada Department of Chemistry Abdul Wali Khan University MardanMardan 23200Pakistan

In this work,a comparative study of three frequently employed modification techniques to g-C_(3)N_(4)(CN)nanosheets for the photocatalytic degradation of metribuzin(MET)under visible-light irradiation has been carried out in *** modification methods were coupling TiO_(2)nanoparticles(TO)as electron acceptors,nano-sized Fe_(2)O_(3)(FO)to construct a Z-scheme nanocomposite,and phosphate(HP)modification to promote O_(2)*** steady-state and transient-state surface photovoltage spectra and transient photoluminescence(PL)spectra confirmed that all the three modification techniques enhanced the charge separation with prolonged lifetimes and presented degradation activities in the order of TO/CN[FO/CN[HP/*** TO/CN nanocomposite showed the highest photocatalytic activity for MET degradation,with a sixfold higher rate than bulk *** chromatography–tandem mass spectrometry and radical trapping experiments indicated that the increased activity was related to the synergetic effect of two radicals(·O^(2-) and ·OH)involved in the photocatalytic degradation pathway,which was different from the·OH radical-dominated pathway of bulk *** work reveals the importance of charge separation and the influence of the radical pathway and provides guidance for the design of high-efficiency photocatalysts.

关键词： g-C_(3)N_(4) TiO_(2)modification Fe_(2)O_(3)coupling Visible-light photocatalysis Charge separation Metribuzin

硫掺杂氮化碳纳米片棒状聚集体用于光催化析氢

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Science China Materials 2023年第12期66卷 4669-4679页

作者：林斯颖吴宝刚李琪肖旭东郑芒刘佳男谢颖蒋保江 School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

合成具有较宽吸收光谱的少层氮化碳是一个具有吸引力的课题.杂原子掺杂(特别是硫掺杂)可以有效地避免纳米级片层氮化碳中由于量子限制效应所引起的带隙加宽.与二次煅烧硫化不同的是,预硫化超分子前驱体可以原位地形成硫掺杂氮化碳纳米... 详细信息

合成具有较宽吸收光谱的少层氮化碳是一个具有吸引力的课题.杂原子掺杂(特别是硫掺杂)可以有效地避免纳米级片层氮化碳中由于量子限制效应所引起的带隙加宽.与二次煅烧硫化不同的是,预硫化超分子前驱体可以原位地形成硫掺杂氮化碳纳米片堆叠聚集体(SCN).这种少层的框架结构呈现出了更大的比表面积(139.06 m^(2)g^(−1)),暴露了更多的活性位点.此外,硫的引入使原七嗪环的共轭结构发生扭曲,从而通过激活价带电子的n→π*跃迁而缩小带隙.在模拟日光条件下,SCN0.8(3925.8μmol g^(−1)h^(−1))的析氢速率是块体氮化碳(BCN,485.2μmol g^(−1)h^(−1))的8.1倍.本工作旨在最大限度地利用杂原子掺杂和形态调控的协同效应来提高光催化活性,且为光催化剂的多维同步优化提供了新的视角.

关键词： sulfur-doped carbon nitride few-layer supramolecular self-assembly photocatalysis hydrogen evolution

Recent advances of emerging tin disulfide for room temperature gas sensing

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Rare Metals 2023年第12期42卷 3897-3913页

作者： Ting-Ting Wang Bao-Shuai Xing Chuan-Yu Guo Juan-Yuan Hao You Wang Li-Hua Huo Xiao-Li Cheng Ying-Ming Xu Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of ChemistryChemical Engineering and MaterialsHeilongjiang UniversityHarbin 150080China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Effectively monitoring of hazardous gases has become increasingly important for ecological environment and human *** an emerging component of two-dimensional materials,layered metal dichalcogenides are gaining significant attention due to their unique physical and chemical properties,thus catering well to the gas sensing ***,tin disulfide(SnS_(2))has been widely examined recently owing to its low-cost,earth-abundant,and environmental friendliness features,which meet the requirements of advanced sensing ***,the booming research advancements of SnS_(2)-based gas sensors have been ***,the basic attributes of SnS_(2) and its ability to detect various hazardous gases are ***,innovative approaches that have demonstrated the effectiveness of improving the room temperature sensing performance of SnS_(2) are ***,the major challenges and future opportunities of SnS_(2) are also *** is ultimately expected that this timely review could offer guidance for designing high-performance gas sensing materials and further push forward their potential applications.

关键词： Gas sensors Tin disulfide Advanced approaches Room temperature sensing

Sine-Gordon Solitons and Breathers in Rod-like Magnetic Liquid Crystals under External Magnetic Field

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Communications in Theoretical Physics 2018年第12期69卷 759-764页

作者：李妍鲁小波侯春风 Department of Physics Harbin Institute of Technology Department of Physics Science and Technology Heilongjiang University

To study the nonlinear phenomena in rod-like magnetic liquid crystals(RMLCs), this paper establishes the dynamic model of molecular motion when giving a twisting disturbance to the molecules under external magnetic *** find the twist of the molecules under magnetic field can be propagated in the form of a traveling wave. The dynamic equation of the molecular twisting we derived satisfies the form of Sine-Gordon equation. We obtain two solutions of the Sine-Gordon equation by theoretical calculation: the kink and anti-kink solitons and breathers. The characteristics of those solitons and breathers are discussed.

关键词： rod-like magnetic liquid crystals Sine-Gordon equation kink and anti-kink solitons breathers

硫掺杂石墨相氮化碳的光催化固氮性能中氮空穴对氮气分子活化的提升作用（英文）

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Chinese Journal of Catalysis 2019年第8期40卷 1178-1186页

作者：李政顾贵洲胡绍争邹熊武光辽宁石油化工大学化学化工与环境学部辽宁抚顺113001 黑龙江大学化学化工与材料学院农作物研究院黑龙江哈尔滨150080 大连理工大学化工学院辽宁大连116012

地球上的氮元素十分丰富并主要以氮气形式存在.然而,由于氮的化学及生物惰性,大多数生物体不能直接吸收氮.因此,人工固氮过程被称为继光合作用之后的第二大化学反应.目前工业上常用的固氮技术为Haber-Bosch法,该方法能耗高且使用的原料... 详细信息

地球上的氮元素十分丰富并主要以氮气形式存在.然而,由于氮的化学及生物惰性,大多数生物体不能直接吸收氮.因此,人工固氮过程被称为继光合作用之后的第二大化学反应.目前工业上常用的固氮技术为Haber-Bosch法,该方法能耗高且使用的原料氢气十分危险.因此,寻找更加节能、绿色、安全的固氮技术迫在眉睫.石墨相氮化碳作为一种非金属半导体光催化剂近年来受到研究者青睐.氮化碳化学性质稳定,能带宽度适中,且耐酸碱腐蚀.然而,氮化碳的反应活性位较少,量子效率较低,而且由于光能的能量密度较低,反应物N2分子难以活化,因此光催化固氮性能并不理想.有研究报道称晶格缺陷能作为反应活性位活化氮气分子,提高光催化固氮性能.本文采用介质阻挡放电等离子体法制备了硫和氮空穴共掺杂的石墨相氮化碳催化剂,考察了硫的引入对催化剂光催化固氮性能的影响. XRD, UV-Vis和氮气吸附结果表明,掺杂未改变催化剂的比表面积,但使得氮化碳催化剂晶格发生了细微扭曲,且改变了催化剂的电子结构,降低了能带宽度.通过XPS结果推测了硫元素与氮空穴的相对位置,并确定硫元素取代了氮元素,以S–C键的形式掺入到催化剂晶格中.采用N2-TPD法分析了催化剂对氮气分子的吸附能力,发现氮空穴是氮气分子的化学吸附位.硫的引入能促进氮空穴对氮气分子的吸附与活化能力. PL光谱结果证实硫和氮空穴掺杂均对电子空穴对的分离有促进作用.不同气氛下的PL光谱结果表明,光电子能通过氮空穴从催化剂转移至吸附的氮气分子上. DFT计算结果显示,氮气分子吸附在氮空穴上,吸附后的N≡N键长为1.331 A,小于非吸附状态的N≡N键长(1.157 A).而引入硫以后,氮气分子同样吸附在氮空穴上,N≡N键长进一步增大到1.415 A,且氮气分子的吸附能也显著降低.这些结果都说明硫的引入提高了氮空穴对氮气分子的吸附和活化作用.此外,态密度图结果显示,光电子通过氮空穴从催化剂向吸附的氮气分子转移,且引入硫之后吸附的氮气分子上的电子密度明显提高,进一步证实硫的引入对氮气分子的活化作用.

关键词：石墨相氮化碳氮气光固定共掺杂光催化作用等离子体处理