检索结果-南通市图书馆

Palladium-catalyzed sulfonylative coupling of benzyl(allyl)carbonates with arylsulfonyl hydrazides

在线全文

学校读者我要写书评

暂无评论

Green Synthesis and Catalysis

Green Synthesis and Catalysis 2022年第1期3卷 110-115页

作者： Bozhen Gong Haibo Zhu Yishuai Liu Qian Li Liu Yang Guorong Wu Qiangwen Fan Zongbo Xie Zhanggao Le jiangxi province key laboratory of Synthetic Chemistry East China University of TechnologyNanchang 330013China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China

An efficient palladium-catalyzed sulfonylative coupling for the synthesis of benzyl(allyl)sulfones from sulfonyl hydrazides and carbonates was developed.The novel methodology employs easily accessible chemical feedstocks including stable and readily available arylsulfonyl hydrazides and benzyl(allyl)carbonates.A variety of benzyl(allyl)sulfones could be obtained in good to excellent yields in the presence of Pd(dppf)Cl2 without additional base under mild conditions.

关键词： Benzylic(allylic)sulfones Sulfonyl hydrazides Carbonates C-O cleavage Palladium-catalyzed

Highly efficient capture of thorium ion by citric acid-modified chitosan gels from aqueous solution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 361-365页

作者： Linshan Peng Qihang Peng Tianxiang Jin Zhirong Liu Yong Qian State key laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China

A novel citric acid-modified chitosan gel(CSCA)was synthesized through a simple one-step process and was used to extract thorium ions from wastewater.The CSCA samples with varying chemical compositions were analyzed using SEM with mapping EDS,FT-IR,and static water contact angle measurements,and their adsorption behaviors were studied in detail.The results showed that the adsorption performance of CSCA improves with the increase of CA content in the sample.CSCA possesses an impressive capacity for thorium adsorption of 279.8 mg/g.Furthermore,it showed an ultra-fast adsorption rate and reached equilibrium within 30 min.In terms of recyclability,the CSCA still retained more than 86%of its initial adsorption capacity after 6 cycles of reuse.Density functional theory(DFT)analysis reveals that the good selectivity of this material towards thorium ions should be attributed to the high density of adsorption sites and strong interaction between carboxyl groups and thorium ions.This work could be beneficial in the design and synthesis of new polymer materials for extracting thorium.

关键词： Thorium Adsorption Citric acid Chitosan DFT calculation

Electrochemical deposition of uranium oxide with an electrocatalytically active electrode using double potential step technique

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第8期33卷 3762-3766页

作者： Jie Huang Zhirong Liu Dejuan Huang Tianxiang Jin Yong Qian Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China State key laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

The development of effective uranium-removal techniques is of great significance to the environment and human health.In this work,a double potential step technique(DPST)was applied to remove U(VI)from uranium-containing wastewater using a carbon felt electrode modified by graphene oxide/phytic acid composite(GO-PA@CF).The application of DPST can inhibit water splitting and prevent GO-PA from adsorbing other interfering ions in wastewater.The GO-PA composite can effectively accelerate the electrochemical reduction rate of U(VI),which significantly improved the electrochemical deposition rate of uranium oxide.As a result,the maximum removal efficiency and maximum removal capacity of GOPA@CF electrode reached 98.7%and 1149.3 mg/g,respectively.The removal efficiency remained 97.2%after five cycles of reuse.Moreover,the removal efficiency of GO-PA@CF electrode can reach more than 70%in simulated wastewater.

关键词： Electrochemical deposition Uranium Double potential step technique Graphene oxide nanocomposites

Effects of solvent,supersaturation ratio and silica template on morphology and polymorph evolution of vanillin during swift cooling crystallization

在线全文

学校读者我要写书评

暂无评论

Particuology 2022年第6期20卷 93-104页

作者： Jinbo Ouyang Xiaohong Xing Jian Chen Limin Zhou Zhirong Liu Jerry Y.Y.Heng Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China Department of Chemical Engineering Imperial College LondonSouth Kensington CampusLondon SW72AZUK

Swift cooling crystallization of vanillin was investigated in water,ethanol,isopropanol and ethyl acetate.Morphology and polymorph evolution of vanillin were discussed in terms of solvent,supersaturation ratio and silica template.PXRD,DSC,FTIR and microscope were used to identify polymorphs of vanillin.Results showed that the nucleated polymorphs of vanillin depended largely on the solvent,supersaturation ratio and silica template.Low supersaturation ratios favor the nucleation of stable form I in water,and high supersaturation ratio exceeds 7 generating 100%metastable form II.However,if the supersaturation ratio is too high(S>8),liquid-liquid phase separation will occur,and no crystals could be obtained.In other solvents such as ethanol,isopropanol and ethyl acetate,only form I was obtained.However,it should be noted that the morphology of form I prepared in ethanol,isopropanol and ethyl acetate is distinct from that obtained in water,the former is flake-like and the latter is rod-like.The nucleation of vanillin from different solution was also studied with the presence of SiO_(2),SiO_(2)-NH_(2)and SiO_(2)−COOH templates,which did not change the nucleated polymorph of vanillin,but changed the nucleation and growth rate of stable form I.

关键词： Vanillin Supersaturation ratio Nucleation Polymorph Template

TiO_(2) nanoparticle supported Ru catalyst for chemical upcycling of polyethylene terephthalate to alkanes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

nano Research 2023年第10期16卷 12223-12229页

作者： Rongxiang Li Wei Zeng Runyao Zhao Yanfei Zhao Yuepeng Wang Fengtao Zhang Minhao Tang Ying Wang Xiaoqian Chang Fengtian Wu Zhimin Liu Beijing National laboratory for Molecular Science Key Laboratory of Colloid and Interface and Thermodynamics DepartmentCAS Research/Education Center for Excellence in Molecular ScienceInstitute of chemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices Jiangxi Province Key Laboratory of Synthetic ChemistryEast China University of TechnologyNanchang 330013China

Production of fuel and chemicals from plastic waste is one of the effective ways to upcycle spent plastics,which is an interesting topic and of significance for green and sustainable development.Herein,we demonstrate a highly efficient catalyst,TiO_(2)nanoparticle supported Ru nanocatalyst(Ru/TiO_(2)),for upcycling polyethylene terephthalate(PET)to alkanes in the presence of H_(2) and water.Under the optimal conditions(200℃,60 bar H_(2),and small amount of H_(2)O),PET could completely convert into alkanes,dominated with cyclohexane and methane.It was indicated that the strong interaction between the TiO_(2)support and Ru nanoparticles made electrons flow from the TiO_(2)support to the Ru nanoparticles,which thus rendered Ru/TiO_(2)to have ability to simultaneously catalyze PET hydrolysis and intermediate hydrogenation.This work realizes the transformation of PET to alkanes,which provides a promising way to chemically upcycle PET.

关键词： upcycling of polyethylene terephthalate(PET) Ru/TiO_(2) hydrolysis hydrodeoxidation

Efficient and selective extraction of uranium from seawater based on a novel pulsed liquid chromatography radionuclide separation method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第2期34卷 13-27页

作者： Jian‑Hua Ye Tao Yu State key laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

The novel pulsed liquid chromatography radionuclide separation method presented here provides a new and promising strategy for the extraction of uranium from seawater.In this study,a new chromatographic separation method was proposed,and a pulsed nuclide automated separation device was developed,alongside a new chromatographic column.The length of this chromatographic column was 10 m,with an internal warp of 3 mm and a packing size of 1 mm,while the total separation units of the column reached 12,250.The most favorable conditions for the separation of nuclides were then obtained through optimizing the separation conditions of the device:Sample pH in the column=2,sample injection flow rate=5.698 mL/min,chromatographic column heating temperature=60℃.Separation experiments were also carried out for uranium,europium,and sodium ions in mixed solutions;uranium and sodium ions in water samples from the Ganjiang River;and uranium,sodium,and magnesium ions from seawater samples.The separation factors between the different nuclei were then calculated based on the experimental data,and a formula for the separation level was derived.The experimental results showed that the separation factor in the mixed solution of uranium and europium(1:1)was 1.088,while achieving the initial separation of uranium and europium theoretically required a 47-stage separation.Considering the separation factor of 1.50for the uranium and sodium ions in water samples from the Ganjiang River,achieving the initial separation of uranium and sodium ions would have theoretically required at least a 21-stage separation.Furthermore,for the seawater sample separation experiments,the separation factor of uranium and sodium ions was 1.2885;therefore,more than 28 stages of sample separation would be required to achieve uranium extraction from seawater.The novel pulsed liquid chromatography method proposed in this study was innovative in terms of uranium separation and enrichment,while expanding the possibilities of extracting uranium from seawater through chr

关键词： Pulsed liquid chromatography Nuclide separation Seawater uranium extraction Uranium enrichment

H_(3)PO_(4) activated biochars derived from different agricultural biomasses for the removal of ciprofloxacin from aqueous solution

在线全文

学校读者我要写书评

暂无评论

Particuology 2023年第4期75卷 217-227页

作者： Jinbo Ouyang Jian Chen Wenqian Chen Limin Zhou Di Cai Cong Ren Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang330013China Department of Pharmacy National University of Singapore117544Singapore National Energy Research and Development Center for Biorefinery Beijing University of Chemical TechnologyBeijing100029China

Biochars were prepared by the pyrolysis of various H_(3)PO_(4) activated agricultural biomasses at 600℃and subsequently used as adsorbents for the removal of ciprofloxacin(CIP)from aqueous solution.Peanut shell-based biochar(PSBC),corncob-based biochar(CCBC)and cotton-based biochar(CTBC)had high surface areas(571.0-1006.3 m^(2)/g),well-developed pore structures(mesopores with large pore volumes)and available adsorption functional groups(C=C,C-N and C-O-C).The CIP adsorption onto the biochars was investigated by batch experiments(kinetics,isotherms,thermodynamics,pH,etc.).Thermodynamics calculations showed the spontaneous(ΔG^(θ)0)nature of the mechanism.In particular,CCBC exhibited high adsorption capacity(120.6 mg/g)of CIP in real lake water and it also had significant removal efficiency of other common pharmaceutical contaminants from real lake environ-ment,and even in a coexisting quintuple system.Finally,multiple interaction mechanisms of CIP adsorption onto aromatized biochar were explored combining characterization analysis and theoretical calculations.Elucidation of the mechanism of CIP adsorption onto biochar provides new insights into the assessment of the removal of pharmaceuticals from the aqueous environment.

关键词： Biochar Adsorption Pharmaceutical contaminants Ciprofloxacin Water remediation

A new liquid membrane diffusion model for characterizing the adsorption kinetics of europium by using a continuous measurement of adsorption platform

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第1期35卷 59-72页

作者： Hao-Qi Yu Tao Yu Jian-Hua Ye State key laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China CGN Cangnan Nuclear Power Co. Ltd.Cangnan 325800China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

To explore the kinetic adsorption under continuous and nonequilibrium states, an integration of continuous measurement and adsorption platform kinetics method was proposed, which was initially called the ICM-AP kinetics method, and a corresponding kinetic adsorption experimental method was developed. Adsorption experiments of europium(Eu) on Ca-bentonite,Na-bentonite, and the D231 cation exchange resin were performed using the ICM-AP kinetics method and continuous measurements. Because the kinetic experimental results observed in this study were different from those of traditional batch adsorption data, pseudo-first-order or pseudo-second-order kinetic models were unsuitable for fitting the experimental data.Hence, a liquid membrane diffusion(LMD) model was developed based on the assumption of simultaneous adsorption/desorption to discuss the mechanism of kinetic adsorption. The kinetic adsorption mechanism was also studied by using XPS.The results indicated that the proposed adsorption model can fit the experimental data more suitably, and the adsorption/desorption behaviors of Eu on bentonite and the D231 resin were simultaneously observed, suggesting that the adsorption kinetics of Eu(Ⅲ) was mainly dominated by hydrated Eu(Ⅲ) ions on the liquid membrane.

关键词： ICM-AP method LMD model Adsorption mechanism Eu(Ⅲ)

Regulatable pervaporation performance of Zn-MOFs/polydimethylsiloxane mixed matrix pervaporation membranes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第2期35卷 312-318页

作者： Guorong Wu Qiangwen Fan Wenjie Sun Zhiwu Yu Zhiqian Jia Jianguo Ma Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang 330013China Lab for Membrane Science and Technology College of ChemistryBeijing Normal UniversityBeijing 100875China State key laboratory of Nuclear Resources and Environment School of BiologyChemistry and Material ScienceEast China University of TechnologyNanchang330013China jiangxi province key laboratory of Synthetic Chemistry School of ChemistryBiology and Material ScienceEast China University of TechnologyNanchang 330013China Foshan(Southern China)Institute for New Materials Foshan 528247China

Pervaporation(PV)is an emerging separation technique for liquid mixture.Mixed matrix membranes(MMMs)often demonstrate trade-off relationship between separation factor and flux.In this study,by changing the organic linkers(2-methyl imidazolate,imidazole-2-carboxaldehyde,2-ethyl imidazolate),ZIF-8,ZIF-90 and MAF-6 were prepared and filled in polydimethylsiloxane(PDMS)membranes for dealcoholization of 5%(mass)n-butanol solution,and the membranes properties and pervaporation performances were adjusted.Compared with the pure PDMS membrane,the addition of ZIF-8 resulted in a 9%increase in flux(1136 g·m^(-2)·h^(-1))and a 22.5%increase in separation factor(28.3),displaying antitrade-off effect.For the MAF-6/PDMS MMMs(2.0%mass loading),the pervaporation separation index(PSI)and separation factor were 32347 g·m^(-2)·h^(-1) and 58.6 respectively(increased by 34%and 154%in contrast with that of the pure PDMS membrane),and the corresponding permeation flux was 552 g·m^(-2)·h^(-1),presenting great potential in the removal butanol from water.It was deduced that the large aperture size combined with moderate hydrophobicity of metal–organic frameworks(MOFs)favor the concurrent increase in permeability and selectivity.

关键词： Pervaporation Biofuel Polydimethylsiloxane Membranes Metal-organic frameworks