检索结果-南通市图书馆

Inactivated properties of activated carbon-supported TiO_2 nanoparticles for bacteria and kinetic study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第12期20卷 1527-1533页

作者： li youji MA Mingyuan WANG Xiaohu WANG Xiaohua College of Chemistry and Chemical Engineering Jishou University Hunan 416000 China

The activated carbon-supported TiO2 nanoparticles(TiO2/AC)were prepared by a properly controlled sol-gel *** effects of activated carbons(AC)support on inactivated properties of TiO2 nanoparticles were evaluated by photocatalytic inactivation experiments of Escherichia *** key factors affecting the inactivation effciency were investigated,including electric power of lamp, temperature,and pH *** results show that the TiO2/AC composites have high inactivation properties of *** in compari...

关键词： inactivation activated carbon-supported TiO2 sol-gel method bacteria

Photoactivity of titanium dioxide/carbon felt composites prepared with the assistance of supercritical carbon dioxide: Effects of calcination temperature and supercritical conditions

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2011年第3期54卷 497-505页

作者： li youji CHEN Wei li LeiYong MA MingYuan College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China

TiO2-coated carbon felt(TCF)composite catalysts have been prepared via a supercritical treatment of titanium tetraisopropoxide(TTIP)as the *** physical properties of the catalysts were characterized by means of thermogravimetric and differential thermal analysis(TG–DTA),X-ray diffraction(XRD),fluorescence spectroscopy,scanning electron microscopy (SEM),and BET surface areas *** photocatalytic activities of the materials were evaluated using the degradation of Congo red(CR)as a probe *** the composites showed much higher photocatalytic activity than commercial P25 due to significant synergistic *** TCF retained high photocatalytic activity for degradation of *** photocatalytic efficiency in CR degradation was found to be strongly dependent on the TiO2-coating ratio and calcination temperature.A possible mechanism for the enhanced reactivity involves shuttling of electrons from TiO2 particles to the carbon felt(CF)as a result of an optimal arrangement in TCF that stabilizes charge separation and reduces charge *** addition to the significant synergistic effects,the abundant spaces between adjacent carbon fibers allow UV light to penetrate into the felt-like photocatalyst to a considerable depth,so that a three-dimensional environment is available for the photocatalytic reaction.

关键词： titanium dioxide carbon felt supercritical calcination photocatalysis

Activated carbon supported TiO_2 -photocatalysis doped with Fe ions for continuous treatment of dye wastewater in a dynamic reactor

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2010年第8期22卷 1290-1296页

作者： youji li Jun Chen Jianben liu Mingyuan Ma Wei Chen Leiyong li College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China

Fe-doped TiO 2 coated on activated carbon （Fe-TiO 2 /AC, FTA） composites were prepared by an improved sol-gel method and characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, inductively coupled plasma mass spectrometry and BET surface area analysis. Obtained FTA composites were applied to the continuous treatment of dye wastewater in a dynamic reactor. The effects of Fe ion content, catalyst content, UV-lamp power and flowrate of the continuous treatment of dye wastewater on degradation efficiency were analyzed to determine the optimum operating conditions of dye wastewater degradation. Continuous photocatalytic experiments provided interesting results that FTA had a high chemical oxygen demand （COD） removal rate compared with TiO 2 , Fe doped TiO 2 （FT） and TiO 2 coated on activated carbon （TA）. In particular, when using the FTA catalyst with a Fe ion content of 0.33%, the kinetic content （k = 0.0376） of COD removal was more than the sum of both TA （0.0205） and 0.33% FT （0.0166）. FTA showed a high photoactivity because of a synergistic effect between Fe ions and AC on TiO 2 , which is higher than the individual effects of AC or Fe ions on TiO 2 . Additionally, for the photocatalytic degradation of dye wastewater, the optimum Fe ion content, catalyst content, UV-lamp power and flowrate were 0.33%, 6 g/L, 60 W （two lamps） and 300 mL/hr, respectively. An investigation of catalyst reuse revealed that the 0.33% FTA showed almost no deactivation in photocatalytic degradation of naturally treated wastewater.

关键词： titanium dioxide iron ions activated carbon dye wastewater continuous treatment

Pyrene-benzothiadiazole-based Polymer/CdS 2D/2D Organic/Inorganic Hybrid S-scheme Heterojunction for Efficient Photocatalytic H_(2) Evolution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第6期41卷 31-38页

作者： Ruiqi Gao Huan He Junxian Bai Lei Hao Rongchen Shen Peng Zhang youji li Xin li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000HunanChina

Nowadays,conjugated polymers have garnered numerous attention as a new class of organic photocatalysts due to their tunable electronic properties,low cost,excellent stability and sufficient light-absorption *** particular,pyrene-benzothiadiazole-based conjugated polymer(PBBP)has been considered to be a new type of conjugated polymers for photocatalytic H_(2)***,the poor charge separation seriously limits its practical application in H_(2)*** this work,a PBBP-based polymer/CdS 2D/2D organic/inorganic S-scheme heterojunction photocatalyst with a strong internal electric field is,for the first time,prepared for efficient photo-catalytic hydrogen *** pyrene-benzothiadiazole-based conjugated polymers(PBBP)are synthesized by the Suzuki-Miyaura ***,the hybrid heterojunction photocatalysts are fabricated by coupling CdS with it through the ultrasonic mixing *** a result,the highest H_(2)-production rate of 15.83 mmolh^(-1)g^(-1)is achieved on 20%PBBP/CdS composite under visible-light irradiation,nearly 2.7 times higher than that of pure *** apparent quantum efficiency(AQE)of 20%PBBP/CdS composite could reach 8.66%atλ=420 *** enhanced activity could be attributed to the construction of S-scheme heterojunction,which accelerates the recombination of carriers with weaker redox ability and maintains the strong reducibility of electrons in *** work provides a protocol for pyrene-benzothiadiazole-based conjugated polymers to prepare S-scheme heterojunction photocatalysts based on organic/inorganic coupling.

关键词： photocatalytic hydrogen evolution pyrene-benzothiadiazole-based conjugated polymers S-scheme heterojunction CdS

Enhanced Photocatalytic H_(2)-production Activity of CdS Nanoflower using Single Atom Pt and Graphene Quantum Dot as Dual Cocatalysts

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第6期41卷 6-14页

作者： Yi Yang Jinsong Wu Bei Cheng liuyang Zhang Ahmed Abdullah Al-Ghamdi Swelm Wageh youji li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research Centre(NRC)Wuhan University of TechnologyWuhan 430070China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia College of Chemistry and Chemical engineering Jishou UniversityJishouHunan 416000China

Single-atom catalysts have high catalytic activity due to their unique quantum size effects and optimal atom ***,visi-ble-light-responsive photocatalysts were designed by coupling CdS with graphene quantum dots(GQDs)and platinum single atoms(PtSAs).GQDs and PtSAs were successively loaded on ultrathin CdS nanosheets through freeze-drying and in-situ photocatalytic *** synergistic effect between PtSAs and GQDs results in superior photocatalytic activity with a hydrogen production rate of 13488μmol h^(-1)g^(-1)as well as the maximum apparent quantum efficiency(AQE)of 35.5%in lactic acid aqueous solution,which is 62 times higher than that of pristine CdS(213μmol g^(-1)h^(-1)).The energy conversion efficiency is ca.13.05%.As a photosensitizer and an electron reservoir,GQDs can not only extend the light response of CdS to the visible-light region(400-800 nm),but also promotes the separation of photoinduced electron-hole ***,PtSAs,with unique electronic and geometric features,can provide more efficient proton reduction *** finding provides an effective strategy to remarkably improve the photocatalytic H_(2) production performance.

关键词： hierarchical nanostructure single-atom catalysts graphene quantum dots CdS nanosheets hydrogen production

Preparation and photocatalytic activity of TiO_2-coated granular activated carbon composites by a molecular adsorption-deposition method

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2008年第11期51卷 1036-1043页

作者： li youji, li Jing, MA MingYuan, OUYANG YuZhu & YAN WenBin College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China 1. College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China

TiO2 nanoparticle-coated granular activated carbon (GAC) composite photocatalysts (CPs) were suc-cessfully prepared by a molecular adsorption-deposition (MAD) method. The CPs were detected by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), BET surface area and UV-Vis adsorption spectroscopy, and their photoactivity was evaluated by methyl orange (MO) photodegradation. The results show that small-sized TiO2 nanoparticles were dispersed well, deposited on the surface of GAC, and showed slight blue shift in comparison with pure TiO2. With the increase in TiO2 content, the CPs showed band gaps in lower energy, smaller surface areas and the higher content of Ti3+ ions. Compared with pure TiO2 and others CPs samples, CPs-382 sample showed the highest photoactivity due to the optimum TiO2 content and surface area besides the synergic effect of photocatalytic degradation of TiO2 and adsorptive property of GAC. In addition, the CPs could be very easily reclaimed, recycled and reused for methyl orange removal while high photoactivity is pre-served.

关键词： photocatalysis titanium dioxide granular activation carbon composites molecular adsorption–deposition method

Preparation of TiO_2/activated carbon with Fe ions doping photocatalyst and its application to photocatalytic degradation of reactive brilliant red K2G

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2009年第8期52卷 1113-1119页

作者： li youji,li Jing,MA MingYuan,OUYANG YuZhu & YAN WenBin College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China 1. College of Chemistry and Chemical Engineering Jishou University Jishou 416000 China

Titanium dioxide coated on activated carbon(AC) with Fe ions doping(Fe-TiO2/AC) composite was prepared by an improved sol-gel *** photocatalytic activities were tested by photocatalytic degradation of reactive brilliant red K2G in *** results show that in comparison with the agglomeration of pure TiO2,the TiO2 nanoparticles are well dispersed in the AC matrix,of which sizes are decreased with Fe ions ***,the iron species on TiO2 of composite are Fe2O3 and FeO,which do not affect the crystalline structures of TiO2 *** AC matrix and iron doping content influence the fluorescence intensity of composite due to their effects on recombination probability of hole-electron *** with TiO2,0.3% Fe-TiO2,TiO2/AC,0.5% Fe-TiO2/AC and 0.1% Fe-TiO2/AC,the 0.3% Fe-TiO2/AC shows the highest photoactivity with the complete mineralization of K2G for finite time due to the optimum Fe ions content and AC ***,the kinetic constant(k=0.0229 min-1) of 0.3% Fe-TiO2/AC composite is more than the sum of both TiO2/AC(0.0154 min-1) and 0.3% Fe-TiO2(0.0057 min-1) because coexistence of the AC and Fe ions has an enlarging effect on improving the photoactivity of TiO2.

关键词： TiO2 nanoparticles Fe ions activated carbon photocatalysis reactive brilliant red K2G

All-organic covalent organic frameworks/perylene diimide urea polymer S-scheme photocatalyst for boosted H_(2) generation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2022年第10期43卷 2581-2591页

作者： Zizhan liang Rongchen Shen Peng Zhang youji li Neng li Xin li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642GuangdongChina State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000HunanChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina

Conjugated covalent organic frameworks(COFs)hold great promise in photocatalytic hydrogen evolution owing to their high crystallinity,large surface area,and distinct ***,COFs exhibit poor charge ***,investigating highly effective COF-based photocatalysts is *** the first time,conjugated COF/perylene diimide urea polymer(PUP)all-organic heterostructure with S-scheme interfacial charge-transfer channels was successfully developed and manufactured via in situ coupling of the two-dimensional triazine-based imine-linked COF(denoted as TATF-COF)with *** optimal photocatalytic hydrogen-evolution rate of 94.5 mmol h^(-1) g^(-1) for TATF-COF/PUP is 3.5 times that of pure TATF-COF and is comparable to or even higher than that of the previously reported COF-based photocatalysts,resulting in an apparent quantum efficiency of up to 19.7%at 420 *** improved directional S-scheme charge transfer driven by the tuned built-in electric field and enhanced oxidation and reduction reaction rates of the photogenerated carriers contribute synergistically to the boosted photocatalytic H_(2) *** and theoretical studies reveal plausible H_(2) evolution and spatial S-scheme charge-separation mechanisms under visible-light *** study provides advanced methods for constructing all-organic S-scheme high-efficiency photocatalysts by the modulation of band structures.

关键词： Covalent organic framework Photocatalytic hydrogen evolution S-Scheme heterostructure Perylene diimide urea polymer Spatial charge-separation mechanism

太阳能驱动H_(2)O_(2)的原位生产与利用:自循环光催化芬顿系统

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2023年第1期44卷 4-6页

作者：张鹏李佑稷李鑫郑州大学材料与工程学院低碳环保材料智能设计国际联合研究中心河南郑州510642 吉首大学化学与化工学院湖南吉首416000 华南农业大学生物质工程研究院农业部能源植物资源与利用重点实验室广东广州510642

人工光合成通过模拟自然界的光合作用合成人类必须的化学品,并在光解水制氢、水和氧气反应制备双氧水等领域得到了广泛的关注.然而,双氧水不稳定导致产物的分离和提纯成本高,阻碍了其进一步发展.为解决上述问题,最近,南京理工大学张侃... 详细信息

人工光合成通过模拟自然界的光合作用合成人类必须的化学品,并在光解水制氢、水和氧气反应制备双氧水等领域得到了广泛的关注.然而,双氧水不稳定导致产物的分离和提纯成本高,阻碍了其进一步发展.为解决上述问题,最近,南京理工大学张侃教授团队联合韩国延世大学Jong Hyeok Park教授,河海大学敖燕辉教授开发出了基于人工树叶的自循环光芬顿系统,在碳酸氢盐溶液和微量Mn^(2+)/Mn^(4+)的协同作用下,成功地将原位生产的双氧水进一步生成活性含氧物种(ROSs)并用于污水处理,实现了高效太阳能驱动H_(2)O_(2)的原位生产与利用(见***.,2022,13,4982).该工作首先利用人工树叶阴极部分对Mn^(4+)离子还原,实现了Mn^(2+)/Mn^(4+)氧化还原物种在催化体系中的循环使用,确保了芬顿体系的可持续性.其次,通过对耦合的光阳极以及阴极的表面动力学过程进行优化,构建了太阳能到双氧水转换效率超过1.46%的人工树叶.实验发现,70 cm^(2)的大面积器件可在70 min内矿化含有5 ppm罗丹明B,5 ppm亚甲基蓝和5 ppm对硝基苯酚的混合污水,并表现出超过一个月的稳定性.综上,本文可为发展新的太阳能驱动环境处理模式提供借鉴.

关键词：光电催化双氧水合成芬顿反应人工树叶环境处理