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Green synthesis of three-dimensional magnesium ferrite/titanium dioxide/reduced graphene from Garcinia mangostana extract for crystal violet photodegradation and antibacterial activity

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Journal of Semiconductors 2023年第12期44卷 111-124页

作者： Tong Hoang Lin Che Quang Cong Nguyen Thanh Hoai Nam Hoang An Nguyen duy Hai Ton That Buu Thoi Le Nhat Binh Hoang Le Minh Lam Thanh Ngan Hoang Thuy Kim Ngan du chi vi Ta Dang Khoa Nguyen Huu Hieu VNU-HCM Key Laboratory of Chemical Engineering and Petroleum Processing(Key CEPP Lab)Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam Faculty of Chemical Engineering Ho Chi Minh City University of Technology(HCMUT)268 Ly Thuong Kiet StreetDistrict 10Ho Chi Minh CityVietnam vietnam National University Ho chi Minh City(VNU-HCM) Linh Trung WardThu Duc CityVietnam

In this study,three-dimensional porous magnesium ferrite/titanium dioxide/reduced graphene oxide(Mg Fe_2O_(4)-GM/TiO_(2)/rGO(MGTG))was successfully synthesized via green and hydrothermal-supported co-precipitation methods using the extract of Garcinia mangostana(***)as a reducing *** characterization results indicate the successful formation of the nano/micro Mg Fe_(2)O_(4)(MFO)and TiO_(2) on the structure of the reduced graphene oxide(rGO),which can also act as efficient support,alleviating the agglomeration of the nano/micro MFO and TiO_(2).The synergic effects of the adsorption and photodegradation activity of the material were investigated according to the removal of crystal violet(CV)under ultraviolet *** effects of catalyst dosage,CV concentration,and p H on the CV removal efficiency of the MGTG were also *** to the results,the CV photodegradation of the MGTG-200 corresponded to the pseudo-first-order kinetic *** reusability of the material after 10 cycles also showed a removal efficiency of 92%.This happened because the materials can easily be recollected using external *** addition,according to the effects of different free radicals·O_(2)^(-),h^(+),and·OH on the photodegradation process,the photocatalysis mechanism of the MGTG was also thoroughly *** antibacterial efficiency of the MGTG was also evaluated according to the inhibition of the Gram-positive bacteria strain Staphylococcus aureus(***).Concurrently,the antibacterial mechanism of the fabricated material was also *** results confirm that the prepared material can be potentially employed in a wide range of applications,including wastewater treatment and antibacterial activity.

关键词： magnesium ferrite titanium dioxide reduced graphene oxide Garcinia mangostana photodegradation antibacterial

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Reduced graphene oxide-nano zero value iron(rGO-nZvi) micro-electrolysis accelerating Cr(Ⅵ) removal in aquifer

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Journal of Environmental Sciences 2018年第11期30卷 96-106页

作者： Liming Ren Jun Dong Zifang chi Huazheng Huang Key Lab of Groundwater Resources and Environment Ministry of Education Jilin University Changchun 130021 China

Nanoscale zero-valent iron （nZvi） assembled on graphene oxide （GO）（rGO-nZvi） composites were synthesized by reduction of GO and ferrous ions with potassium borohydride, for use in Cr（vi） removal from aqueous solution. The results showed that the two-dimensional structure of GO could provide a skeleton support for Fe0, thus overcoming the bottleneck of aggregation for nZvi. Also, rGO-nZvi would form a ferric-carbon micro-electrolysis system in Cr（vi）-contaminated aquifers, enhancing and accelerating electron transfer, exhibiting high rate and capacity for Cr（vi） removal. The optimum dosage of the applied rGO-nZvi was linearly correlated with the initial Cr（vi） concentration. Characterization of rGO-nZvi before and after reaction with Cr（vi） revealed the process of Cr（vi） removal： rGO-nZvi firstly transferred electrons from Fe0 cores via their Fe（II）/Fe（III） shells to the GO sheet; there, negatively charged Cr（vi） received electrons and changed into positively charged Cr（III）, which was adsorbed by the negatively charged GO sheet, avoiding the capping and passivating of nZvi rGO-nZvi formed a good electrically conductive network, and thus had long-term electron releasing properties, which was important for groundwater remediation.

关键词： Reduced graphene oxide-nano zero value iron (rGO-nZvi) Micro-electrolysis Cr(vi) removal Groundwater remediation

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Vertex Disjoint Cycles in Intersection Graphs of Bases of Matroids

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Wuhan University Journal of Natural Sciences 2017年第6期22卷 461-464页

作者： ZHANG Yinghao chi Hongmei College of Science Huazhong Agriculture University Wuhan430070 Hubei China

The intersection graph of bases of a matroid M=（E, B） is a graph G=GI（M） with vertex set V（G） and edge set E（G） such that V（G）=B（M） and E（G）={BB′：｜B∩B′｜ ≠0, B, B′∈B（M）, where the same notation is used for the vertices of G and the bases of M. Suppose that｜V（GI（M））｜ =n and k1＋k2＋…＋kp=n, where ki is an integer, i=1, 2,…, p. In this paper, we prove that there is a partition of V（GI（M）） into p parts V1 , V2,…, Vp such that ｜vi｜ =ki and the subgraph Hi induced by vi contains a ki-cycle when ki ≥3, Hi is isomorphic to K2 when ki =2 and Hi is a single point when ki =1.

关键词： matroid intersection graph base cycle

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Adsorption behavior of uranium on polyvinyl alcohol-g-amidoxime:Physicochemical properties, kinetic and thermodynamic aspects

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Science china Chemistry 2013年第11期56卷 1495-1503页

作者： chi FangTing HU ShengX HU Sheng XIONG Jie WANG XiaoLi Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 China

Amidoxime-based adsorbents are widely studied as the main adsorbent in the recovery of uranium from seawater. However, the adsorption rate and loading capacity of such adsorbents should be further improved due to the economic viability consider- ation. In this paper, polyvinyl alcohol functionalized with amidoxime （PVA-g-AO） has been prepared as a new adsorbent for uranium （vi） adsorption from aqueous solution. The physicochemical properties of PVA-g-AO were investigated using infra- red spectroscopy （IR）, scanning electron microscope （SEM）, X-ray diffraction （XRD）, and X-ray photoelectron spectroscopy （XPS）. Results showed that the ligand monomers were successfully grafted onto the matrixes. The XRD and XPS analysis showed that uranium was adsorbed in metal ionic form rather than in crystal form. Uranyl （U （vi）） adsorption properties onto PVA-g-AO were evaluated. The adsorption of U （vi） by PVA-g-AO was fast, with an equilibrium time of less than 50 rnin. Additionally the maximum adsorption capacity reached 42.84 mg/g at pH 4.0.

关键词： recovery uranium from seawater polyvinyl alcohol-g-amidoxime physicochemical properties adsorption behavior

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Physical Insight for Grafting Polymer Chains onto the Substrate via Computer Simulations:Kinetics and Property

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chinese Journal of Polymer Science 2022年第7期40卷 817-833页

作者： chi-Xin Liang Hui Lu Bai-Ying Huang Ji-Yuan Xing Feng-Long Gu Hong Liu School of Chemistry South China Normal UniversityKey Laboratory of Theoretical Chemistry of Environment Ministry of EducationGuangzhou510006China State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchun130023China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Molecules adsorbed or attached on a surface is a quite basic phenomenon in numerous chemical or biological ***-onto is considered as a feasible way to achieve *** grafting reaction is essentially controlled by the diffusion of the molecules,thus it is more likely a physical issue,instead of a chemical *** of the experimental difficulty in measuring the properties of surface-attached molecules(e.g.,the polymeric molecules),the surface-bound molecules are often assumed as with the same properties as that of the start feeding ones in *** assumption was even used to guide further characterization,while it is proved to be invalid by different quantifying ***,an effective prediction for the properties of surface-bound molecules is still *** on a microscopic level and a dynamic perspective,the grafting process onto a flat substrate with polydisperse feeding polymeric molecules is investigated in-depth by coarse-grained Brownian dynamics simulation as well as model *** find from simulations that for the final grafting densityσ_(g)and the mean chain length of start feeding molecules,the dependence ofσ_(g)-^(γ)with the constant exponential factorγmay be a determined rule for one-end functionalized flexible linear polymer chains grafting on the flat *** grafting-onto is a multiple interplayed process,our simulation study indicates that there is an optimized initial concentration of start feeding molecules for achieving high grafting density of surface-bound *** also propose a correctional equation to quantitatively predict the molecular weight distribution(MWD)of surface-bound polymeric molecules,which may be effective for predicting the MWD of the surface-bound ones in specific *** simulation study helps to better understand the kinetics of grafting-onto process,and serves as a theoretical guide to achieve the precise design of surface modification materials vi

关键词： Grafting-onto Grafting density Polydisperse Molecular weight distribution

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A new variational inequality formulation for unconfined seepage flow through fracture networks

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Science china(Technological Sciences) 2012年第11期55卷 3090-3101页

作者： JIANG QingHui YE ZuYang YAO chi ZHOU ChuangBing School of Civil Engineering Wuhan UniversityWuhan 430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

Darcy's law only applying to the flow domain is extended to the entire fracture network domain including the dry *** partial differential equation(PDE) formulation for unconfined seepage flow problems for discrete fracture network is established,in which a boundary condition of Signorini's type is prescribed over the potential seepage *** order to reduce the difficulty in selecting trial functions,a new variational inequality formulation is presented and mathematically proved to be equivalent to the PDE *** numerical procedure based on the vi formulation is proposed and the corresponding algorithm has been *** a continuous penalized Heaviside function is introduced to replace a jump function in finite element analysis,oscillation of numerical integration for facture elements cut by the free surface is eliminated and stability of numerical solution is *** numerical results from two typical examples demonstrate,on the one hand the effectiveness and robustness of the proposed method,and on the other hand the capability of predicting main seepage pathways in fractured rocks and flow rates out of the drainage system,which is very important for performance assessments and design optimization of complex drainage system.

关键词： fracture network seepage flow free surface variational inequality condition of Signorini's type

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Alkylimido osmium(vi) and ruthenium(vi) porphyrins. Crystal and molecular structures of Os(TTP)(O)(NBu^t)·EtOH and Os(4-Cl-TPP)(NBu^t)_2

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chinese Journal of Chemistry 1997年第1期15卷 1-12页

作者： LI, Zao-YingDepartment of Chemistry, Wuhan University, Wuhan, Hubei 430072, chinaCHE, chi-Ming Department of Chemistry, The Hong Kong University, Hong Kong UNIV HONG KONG DEPT CHEMHONG KONGHONG KONG

Oxo(tert-butylimido) or bis(tert-butylimido)osmium(vi) porphyrins Os(Por)(O)(NBut) and Os(Por)(NBut)2, [Por=meso-tetrakis(p-tolyl)porphyrinato (TTP) and meso-tetrakis(4-chlorophe-nyl)porphyrinato (4-Cl-TPP)] were synthesized by air oxidation of bis(tert-butylamme)osmium(II) porphyrins [Os(Por)(H2NBut)2 (Por=TPP, 4-Cl-TPP], depending on whether tert-butylamine is present. The bis(tert-butylamine)ruthenium(II) porphyrins [Ru(Por)(H2NBut)2, Por=TTP, 4-Cl-TPP] can undergo bromine oxidation to give oxo(tert-butylimido)ruthenium(vi) complexes in quantitative yields. All these new complexes were characterized by 1H NMR, UV-visible and IR spectroscopy. The X-ray crystal structures of Os(TTP)(O)(NBut).EtOH and Os(4-Cl-TPP)(NBut)2 have been determined. Crystal data: for Os(TTP)(O)(NBut).EtOH: monoclinic, space group P21/c, a=1.3546(6) nm, b=2.3180(3) nm, c=1.6817(3) nm, B=90.84(2), V=527.97(1) nm3, Z=4. The Os=O and Os=NBut distances in Os(TTP)(O)(NBut).EtOH are 0.1772(7) nm and 0.1759(9) nm, respectively. The average Os=NBut distance of Os(4-Cl-TPP)(NBut)2 is 0.1775 nm.

关键词： Alkylimido ruthenium osmium porphyrin crystal structure

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PRRS in vietnam and Its Diagnosis

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Journal of Life Sciences 2015年第6期9卷 272-276页

作者： Ngoc Hai Nguyen Thi Hong vi Vuong Tan Hung Vo Department of Infectious Diseases and Public Health Faculty of Animal Science and Veterinary Medicine Nong Lam UniversityHo Chi Minh city 0084-8 Vietnam Hanviet Veterinary Diagnosis Laboratory Nong Lam University Ho Chi Minh city 0084-8 Vietnam

Genotyping 42 serum samples taken from the pigs in the oubreaks from 2009 to 2013 with RT-PCR and nested RT-PCR, showed more than 80% of samples were positive with chinese PRRSV clade, and the others were European and North American classical PRRSV genotypes. Ten serum samples from unnapprent PRRS herds were examined for antibodies against PRRSV with ELISA and also for PRRSV with RT-PCR. It was clearly that the titer of antibodies against PRRSV by ELISA test could not be used for interpreting PRRSV infection. In despite of PRRS vaccination or non-vaccination, a risk of PRRSV infection and re-infection exist, utilizing RT-PCR in combination with serology will give the producer and veterinarian PRRSV more exact situation in the herds.

关键词： vietnam PRRS genotype diagnosis ELISA RT-PCR.

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Magnetic Order and Its Interplay with Structure Phase Transition in van der Waals Ferromagnet vi_(3)

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chinese Physics Letters 2021年第9期38卷 69-73页

作者： Yiqing Hao Yiqing Gu Yimeng Gu Erxi Feng Huibo Cao Songxue chi Hua Wu Jun Zhao State Key Laboratory of Surface Physics and Department of PhysicsFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200232China Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Laboratory for Computational Physical Sciences(MOE) Fudan UniversityShanghai 200433China Institute of Nanoelectronics and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Van der Waals magnet vi_(3) demonstrates intriguing magnetic properties that render it great for use in various ***,its microscopic magnetic structure has not been determined ***,we report neutron diffraction and susceptibility measurements in vi_(3) that revealed a ferromagnetic order with the moment direction tilted from the c-axis by ~36° at 4 K.A spin reorientation accompanied by a structure distortion within the honeycomb plane is observed,before the magnetic order completely disappears at TC=50 *** refined magnetic moment of ~1.3μB at 4 K is much lower than the fully ordered spin moment of 2μB/V^(3+),suggesting the presence of a considerable orbital moment antiparallel to the spin moment and strong spin-orbit coupling in vi_(3).This results in strong magnetoelastic interactions that make the magnetic properties of vi_(3) easily tunable via strain and pressure.

关键词： Transition refined render

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旋流泵结构参数对泵性能的影响

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农业机械学报 2000年第2期31卷 46-49页

作者：郑铭袁寿其陈池江苏理工大学生物与环境工程学院镇江市212013 江苏理工大学流体中心

在旋流泵流场计算及流场测试基础上 ,就旋流泵的结构参数对泵性能的影响进行了一系列试验研究 ,总结了以蜗壳无叶腔体积 V0 与叶轮体积 vi 之比 ZV 来设计旋流泵的方法 ,并由大量试验数据统计得到 ,当ZV=V0 /vi=3～ 5时可获得较好的水... 详细信息

在旋流泵流场计算及流场测试基础上 ,就旋流泵的结构参数对泵性能的影响进行了一系列试验研究 ,总结了以蜗壳无叶腔体积 V0 与叶轮体积 vi 之比 ZV 来设计旋流泵的方法 ,并由大量试验数据统计得到 ,当ZV=V0 /vi=3～ 5时可获得较好的水力性能。设计的几种旋流泵的效率比国内外同类产品提高了 3%～ 5 %

关键词：旋流泵性能结构参数蜗壳叶轮设计

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