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Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： process optimization by response surface methodology

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Frontiers of Materials Science 2016年第1期10卷 45-55页

作者： Huan-yan XU Tian-Nuo SHI Hang ZHAO Li-Guo JIN Feng-Chun WANG Chun-yan WANG shu-yan qi School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

Fe3O4/MWCNTs nanocomposites were prepared by chemical oxidation coprecipitation method and developed as highly efficient heterogeneous Fenton-like catalyst. XRD results revealed that Fe3O4 nanoparticles deposited onto MWCNTs surface remained the inverse spinel crystal structure of cubic Fe3O4 phase. The FTIR characteristic peaks of MWCNTs weakened or disappeared due to the anchor of Fe3O4 nanoparticles and Fe-O peak at 570 cm^-1 was indicative of the formation of Fe3O4. TEM observation revealed that Fe3O4 nanoparticles were tightly anchored by MWCNTs. The Fenton-like catalytic activity of Fe3O4/MWCNTs nanocomposites for the discoloration of methyl orange （MO） was much higher than that of Fe3O4 nanoparticles. The process optimization of this heterogeneous Fenton-like system was implemented by response surface methodology （RSM）. The optimum conditions for MO discoloration were determined to be of 12.3 mmoi/L H2O2 concentration, 2.9 glL catalyst dosage, solution pH 2.7 and 39.3 min reaction time, with the maximum predicted value for MO discoloration ratio of 101.85%. The corresponding experimental value under the identical conditions was obtained as 99.86%, which was very close to the predicted one with the absolute deviation of 1.99%.

关键词： Fe3O4/MWCNTs Fenton-like catalyst azo dye response surface methodology

Comparative studies on Fenton-like reactions catalyzed by Fe_(3)O_(4) loaded inside and outside halloysite nanotubes for the removal of organic pollutants

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Frontiers of Materials Science 2024年第1期18卷 15-28页

作者： yang Li Jia-qi Zhou Huan-yan Xu Li-Min Dong Mao-Chang Cao Lian-Wei Shan Li-Guo Jin Xiu-Lan He shu-yan qi Heilongjiang Provincial Key Laboratory of CO_(2) Resource Utilization and Energy Catalytic Materials School of Materials Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040China

In this work,Fe_(3)O_(4) nanoparticles(NPs)loaded inside and outside halloysite nanotubes(HNTs)were prepared and developed as the heterogeneous Fenton-like catalysts for the removal of representative organic *** results indicated that the samples with Fe_(3)O_(4) NPs loaded outside the HNTs lumen(Fe_(3)O_(4)/HNTs)and inside the HNTs lumen(Fe_(3)O_(4)@HNTs)were successfully *** samples had typical magnetic hysteresis loops,while Fe_(3)O_(4)@HNTs exhibited higher magnetization *** comparative experiments showed that Fe_(3)O_(4)@HNTs had better Fenton-like catalytic ability than that of Fe_(3)O_(4)/HNTs in the degradation of various organic *** Rhodamine B(RhB)as an example,the adsorption thermodynamics and kinetics of RhB onto Fe_(3)O_(4)/HNTs and Fe_(3)O_(4)@HNTs were also *** comparative results demonstrated that the adsorption ability of Fe_(3)O_(4)/HNTs was better than that of Fe_(3)O_(4)@***,the dissolved concentration of Fe^(2+)and production amount of hydroxyl radical(·OH)in the Fe_(3)O_(4)@HNTs-H_(2)O_(2) system were significantly higher than those in the Fe_(3)O_(4)/HNTs-H_(2)O_(2) *** on aforementioned comparison,the nano-confinement effect in the Fe_(3)O_(4)@HNTs-H_(2)O_(2) system was *** work provides meaningful guidance for the cheap and convenient design of nanoreactors for Fenton-like applications.

关键词： Fe_(3)O_(4) halloysite nanotube adsorption Fenton-like reaction mechanism

Effects of Combination of 1,25(OH)_(2)D_(3) and TLR-4 Inhibitor on the Damage to HaCaT Cells Caused by UVB Irradiation

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Biomedical and Environmental Sciences 2022年第11期35卷 1051-1062页

作者： CHEN Peng ZHUANG Chuan Ning CUI Jia Jing WANG Ping Wei LIU Dong Ge yan shu qi ZHOU Li Ting REN shu Ping Department of Pediatrics the Second Hospital of Jilin UniversityChangchun 130041JilinChina Department of Occupational and Environmental Health School of Public HealthJilin UniversityChangchun 130021JilinChina

Objective Vitamin D and Toll-like receptor-4(TLR-4)inhibition are involved in the protection of *** effects of combination of 1,25(OH)_(2)D_(3) and TLR-4 inhibitor on the protection of keratinocytes against ultraviolet radiation B(UVB)irradiation remain *** study was undertaken to explore the effects of combination of 1,25(OH)_(2)D_(3) and TAK-242(TLR-4 inhibitor)on the damage to HaCaT cells caused by UVB *** In vitro,HaCaT cells were treated with 1,25(OH)_(2)D_(3) or/and TAK-242 prior to UVB irradiation at the intensity of 20 mJ/cm^(2),then the production of reactive oxygen species(ROS),cell migration,apoptosis of cells,and the expression of oxidative stress,endoplasmic reticulum stress,and apoptosis related proteins were *** Compared with the HaCaT cells treated with 1,25(OH)_(2)D_(3) or TAK-242,the cells treated with both 1,25(OH)_(2)D_(3) and TAK-242 showed,1)significantly lower production of ROS(P<0.05);2)significantly less apoptosis of HaCaT cells(P<0.05);3)significantly lower expression of NF-κB,Caspase-8,Cyto-C,Caspase-3(P<0.05).Conclusion The combination of 1,25(OH)_(2)D_(3) and TAK-242 could produce a better protection for HaCaT cells via inhibiting the oxidative stress,endoplasmic reticulum stress and apoptosis than 1,25(OH)_(2)D_(3) or TAK-242 alone.

关键词： UVB 1,25(OH)_(2)D_(3) Toll-like receptor 4 HaCaT cell Combined effects

Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： kinetics and Fenton-like mechanism

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Frontiers of Materials Science 2018年第1期12卷 34-44页

作者： Huan-yan XU Yuan WANG Tian-Nuo SHI Hang ZHAO Qu TAN Bo-Chao ZHAO xiu-Lan HE shu-yan qi School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

The kinetics and Fenton-like mechanism are two challenging tasks for heterogeneous Fenton-like catalytic oxidation of organic pollutants. In this study, three kinetic models were used for the kinetic studies of Fe3O4/MWCNTs-H2O2 Fenton-like reaction for MO degradation. The results indicated that this reaction followed the first- order kinetic model. The relationship of reaction rate constant and temperature followed the Arrhenius equation. The activation energy and frequency factor of this system were calculated as 8.2 ***1-1 and 2.72 s-1, respectively. The quantifications of Fe ions dissolution and ,OH radicals generation confirmed that the homogeneous and hetero- geneous catalyses were involved in Fe3O4/MWCNTs＇H2O2 Fenton-like reaction. The reaction rate constant was closely related with Fe ions dissolution and ,OH radicals generation. Fe3O4/MWCNTs nanocomposites had typical ferromagnetic property and could be easily separated from solution by an external magnet after being used. Furthermore, Fe3O4/MWCNTs nanocomposites exhibited good stability and recyclability. Finally, the Fenton-like mechanisms on homogeneous and heterogeneous catalyses were described.

关键词： MWCNTs Fe3O4 NPs kinetics ,OH radicals Fenton'like mechanism

STUDY ON Li-TiO2 CATALYSTS FOR METHANE OXIDATIVE COUPLING

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Journal of Energy Chemistry 1994年第3期 312-321页

作者： YIN Zhong-Ren XU Jing-ShiJIN Yong-shu yan qi-JieDepartment of Chemistry and +Center of Materials Analysis Nanjing UniversityNanjing, Jiangsu 210008

Methlane oxidative coupling over Li-TiOcatalysts prepared by im-regating rutile with aqueous solution of LiOH has been studied.X-raydiffraction（XRD）,X-ray photoelectron spetroscopy（XPS）,temperatureprogrammed reduction（TPR）and TPDE were used for catalyst *** results showed that the catalytic activity of the samples dramaticallyincreased with Li/Ti ratio increasing from 2.0 to *** 780℃,CH/air=1/3 and GHSV=6000 mL·g·h,a 45.6% CHcoversion and 51.3%Cselectivity were obtained over the catalyst with Li/Ti ratio of 2.5、XRD andTPR reults revealed that the catalytic performance was related to the oxidationstate of titanium,the catalytic activity of Tiwas higher than that of Ti（4+） andexcessive content of Li stabilized Tiin the *** studies showed thatthe decomposition of LiCOon the catalyst surface may promote the redox cir-culation of Ti and the releasing of lattice oxygen

关键词： TiO CO STUDY ON Li-TiO2 CATALYSTS FOR METHANE OXIDATIVE COUPLING TPR Li

喜炎平注射液联合α-2b干扰素治疗婴幼儿轮状病毒肠炎的临床观察

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中国医院药学杂志 2009年第11期29卷 916-918页

作者：万琦鄢素琪武汉市妇女儿童医疗保健中心中医科湖北武汉430016

目的：观察喜炎平注射液联合α-2b干扰素治疗婴幼儿轮状病毒肠炎的疗效。方法：对确诊为轮状病毒肠炎的104例患儿随机分为常规治疗组（n=36）、喜炎平治疗组（n=35）和喜炎平＋干扰素治疗组（n=33）3组，疗程5～7d，比较3组患儿止泻时... 详细信息

目的：观察喜炎平注射液联合α-2b干扰素治疗婴幼儿轮状病毒肠炎的疗效。方法：对确诊为轮状病毒肠炎的104例患儿随机分为常规治疗组（n=36）、喜炎平治疗组（n=35）和喜炎平＋干扰素治疗组（n=33）3组，疗程5～7d，比较3组患儿止泻时间、显效率与总有效率。结果：喜炎平＋干扰素组止泻时间较常规组及喜炎平组明显缩短，差异有显著性。治疗总有效率常规组、喜炎平组、喜炎平＋干扰素组分别为41．7％、85．7％、93．9％，喜炙平组、喜炎平＋干扰素组明显优于常规组；喜炎平＋干扰素组总有效率与喜炎平组比较差异无显著性（P〉0．05），但显效率明显高于喜炎平组（P〈0．01）。结论：喜炎平注射液联合α-2b干扰素治疗轮状病毒肠炎疗效较好，值得临床应用。

关键词：喜炎平注射液干扰素轮状病毒肠炎婴幼儿

Enantioselective reductive conjugate alkenylation of α,β-enones with keto alkenyl acetates by nickel catalysis

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Science China Chemistry 2025年第1期68卷 157-162页

作者： Rong-De He Yun-Lei Luo qiu-Quan Pan qi-Wei Yao Xing-Zhong shu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis, yet their asymmetric variant remains elusive. Concurrently, asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–M. This manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl acetates. The method facilitates the enantioselective addition of keto alkenyl groups to α,β-enones, resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access otherwise. The use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词： nickel alkenylation asymmetric cross-coupling alkenes

环境保护税能否促进区域绿色全要素生产率增长?——基于贝叶斯时空统计的实证研究

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经济问题 2023年第7期 103-112页

作者：韩菲闫书淇山西财经大学经济学院山西太原030006 山西财经大学国际贸易学院山西太原030006

绿色生产是中国经济高质量发展的重要引擎,环境保护税是促进企业绿色生产的有效手段。以中国环境保护税征收标准改革为自然实验,基于2013—2020年中国31个省区市面板数据,运用贝叶斯时空统计方法考察了环境保护税对区域绿色全要素生产率... 详细信息

绿色生产是中国经济高质量发展的重要引擎,环境保护税是促进企业绿色生产的有效手段。以中国环境保护税征收标准改革为自然实验,基于2013—2020年中国31个省区市面板数据,运用贝叶斯时空统计方法考察了环境保护税对区域绿色全要素生产率(GTFP)的影响效应及作用机制。结果显示:环境保护税对区域绿色全要素生产率增长具有正向促进效应,且在东部地区、工业发达及污染严重的地区作用显著。进一步机制分析表明:环境保护税可能通过促进技术创新、推动产业结构转型及提高资源利用效率等路径影响区域绿色全要素生产率增长。研究结论为进一步完善中国环境保护税法提供了实证支持,也为全面构建环境经济政策框架体系提供了决策依据。

关键词：环境保护税绿色全要素生产率贝叶斯时空统计技术创新产业结构转型资源利用效率

Twist monomials of binary delta-matroids

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Acta Mathematica Sinica,English Series 2025年

作者： qi yan Xian'an JIN School of Mathematics and Statistics Lanzhou University School of Mathematical Sciences Xiamen University

Recently, we introduced the twist polynomials of delta-matroids and gave a characterization of even normal binary delta-matroids whose twist polynomials have only one term and posed a problem:what would happen for odd binary delta-matroids? In this paper, we show that a normal binary deltamatroid whose twist polynomials have only one term if and only if each connected component of the intersection graph of the delta-matroid is either a complete graph of odd order or a single vertex with a loop.

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