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Biogenic C-doped titania templated by cyanobacteria for visible-light photocatalytic degradation of Rhodamine B

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Journal of Environmental Sciences 2014年第5期26卷 1195-1202页

作者： Jiao He Guoli Zi Zhiying Yan Yongli li Jiao Xie Deliang Duan Yongjuan Chen Jiaqiang Wang The Universities' Center for Photocatalytic Treatment of Pollutants in Yunnan Province Key Laboratory of Medicinal Chemistry for Natural Resources Ministry of Education School of Chemical Sciences & Technology Yunnan University

Cyanobacteria, which occurred in eutrophic water harvest solar light to carry out photosynthesis with high efficiency. In this work, cyanobacteria （Microcystis sp.） were used as biotemplate to synthesize titania structure. The synthesized titania sample had similar morphology to that of the original template in spite of the fragile unicellular structures and extremely high water content of cyanobacterial cells. Incorporation of biogenic C, as well as the morphology inherited from biotemplate improved visible- light absorbance of the titania structure. The sample exhibited higher visible-light photocatalytic activity than commercial titania photocatalyst Degussa P25 for Rhodamine B （RhB） degradation. Compared with those C-doped titania photocatalysts prepared by other methods, cyanobacteria templated titania photocatalyst offer some potential for competitive advantages. The reported strategy opened up a new use for the cyanobacteria. It could also be used for titania in applications such as treatment of polluted water, dye-sensitized solar cells, or other regions.

关键词： cyanobacteria titania C-doped visible-light photocatalysis

One-pot synthesis of graphene oxide and Ni-Al layered double hydroxides nanocomposites for the efficient removal of U(VI) from wastewater

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Science china chemistry 2017年第3期60卷 415-422页

作者： Shujun Yu Jian Wang Shuang Song Kunyu Sun Jun li Xiangxue Wang Zhongshan Chen Xiangke Wang school of Environment and chemical engineering North China Electric Power University Beijing 102206 China

Graphene oxide and Ni-Al layered double hydroxides(GO@LDH) nanocomposites were synthesized via a one-pot hydrothermal process,and characterized by X-ray diffraction(XRD),Fourier transformed infrared spectroscopy(FTIR),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy in *** exploration of U(VI) sorption on GO@LDH surface was performed as a function of ionic strength,solution pH,contact time,U(VI) initial concentrations and *** of Langmuir isotherms showed that the sorption capacity of GO@LDH(160 mg/g) was much higher than those of LDH(69 mg/g) and GO(92 mg/g).The formed surface complexes between surface oxygen-containing functional groups of GO@LDH and U(VI) turned out to be the interaction mechanism of U(VI) with GO@*** to the thermodynamic studies results,the sorption interaction was actually a spontaneous and endothermic chemical *** sorption isotherms were better fitted with the Langmuir model compared with other models,which suggested the interaction was mainly dominated by mono layer *** GO@LDH nanocomposites provide potential applications as adsorbents in the enrichment of radionuclides from wastewater in nuclear waste management and environmental remediation.

关键词： GO GO@LDH U(Ⅵ) interaction mechanism sorption

Phase-controlled asymmetric optomechanical entanglement against optical backscattering

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Science china(Physics,Mechanics & Astronomy) 2023年第3期66卷 66-75页

作者： Jing-Xue liu Ya-Feng Jiao Ying li Xun-Wei Xu Qiong-Yi He Hui Jing Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Efects and ApplicationsHunan Normal UniversityChangsha 410081China Laboratory of chemical Biology&Traditional Chinese Medicine Research Ministry of Education College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China State Key Laboratory for Mesoscopic Physics School of PhysicsFrontiers Science Center for Nano-optoelectronicsCollaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China

Quantum entanglement plays a key role in both understanding the fundamental aspects of quantum physics and realizing various quantum devices for practical applications. Here we propose how to achieve a coherent switch of optomechanical entanglement in an optical whispering-gallery-mode resonator, by tuning the phase difference of the driving lasers. We find that the optomechanical entanglement and the associated two-mode quantum squeezing can be well tuned in a highly asymmetric way,providing an efficient way to protect and enhance quantum entanglement against optical backscattering, in comparison with conventional symmetric devices. Our findings shed a new light on improving the performance of various quantum devices in the practical noisy environment, which is crucial in such a wide range of applications as noise-tolerant quantum processing and the backscattering-immune quantum metrology.

关键词： quantum entanglement optical backscattering optomechanics

Efficient solar cells based on cosensitizing porphyrin dyes containing a wrapped donor, a wrapped π-framework and a substituted benzothiadiazole unit

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Science china chemistry 2019年第8期62卷 994-1000页

作者： Yunyue Lu Yingchun Cheng Chengjie li Jiaxin Luo Weiqiang Tang Shuangliang Zhao Qingyun liu Yongshu Xie Key Laboratory for Advanced Materials and Institute of Fine chemicals School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai 200237China school of chemical engineering and State Key Laboratory of chemical engineering East China University of Science and Technology Shanghai 200237China College of chemical and Environmental engineering Shandong University of Science and TechnologyQingdao 266510China

Three new porphyrin dyes XW45-XW47 have been synthesized employing a dialkoxy-wrapped phenothiazine donor, a tetraalkoxy-wrapped porphyrin π-framework, a benzothiadiazole(BTD)-based auxiliary acceptor, and an anchoring benzoic acid group. On the basis of our previously reported dye XW36, XW45 was synthesized by introducing a BTD unit to broaden the absorption spectrum, further introducing a hexyl-substituent into the BTD unit afforded XW46, and an additional fluorine atom was introduced to the carboxyphenyl acceptor to afford XW47. As expected, the BTD unit obviously broadens and red-shifts the absorption threshold of XW45-XW47 to ca.750 nm. Dye-sensitized solar cells(DSSCs) were fabricated based on a cobalt electrolyte using chenodeoxycholic acid(CDCA) as the coadsorbent. Under full sun illumination, XW45 exhibits an efficiency of 9.73%, which is slightly lower than that of 10.19% obtained for the reference dye SM315. By contrast, XW46 and XW47 show higher efficiencies than SM315 owing to the improved anti-aggregation ability associated with the hexyl group on the BTD unit and better ICT effect induced by the fluorine atom on the carboxyphenyl unit. Thus, XW47 exhibits the highest efficiency of 10.41% among the porphyrin dyes. Furthermore, PT-C6 was used as the cosensitizer to improve the light harvesting ability and efficiencies of the cells due to its broad absorption within 350–560 nm. Thus, high efficiencies of 10.32%, 11.38% and 10.90% were achieved for the cosensitized solar cells based on XW45–XW47, respectively, owing to the obviously enhanced photocurrent density(JSC). In addition, under 30% full sun illumination, XW46+PT-C6 exhibits a high efficiency of 13.08%. These results give an effective method for building high performance DSSCs through the cosensitization of porphyrin dyes containing a wrapped donor, a wrapped porphyrin framework and a properly substituted auxiliary benzothiadiazole unit.

关键词： dye-sensitized solar cells porphyrin dyes benzothiadiazole cosensitization

Catalytic depolymerization of calcium lignosulfonate by NiMgFeO_x derived from sub-micron sized NiMgFe hydrotalcite prepared by introducing hydroxyl compounds

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Chinese Journal of chemical engineering 2019年第8期27卷 1933-1938页

作者： Hongjing Han Jinxin li Haiying Wang Feng Xue Yanguang Chen Yanan Zhang Yizhen Wang Mei Zhang school of chemistry&chemical engineering Northeast Petroleum UniversityDaqing 163318China Heilongjiang Provincial Key Laboratory of Oil&Gas chemical Technology Daqing 163318China Shandong Sinocera Functional Material Co. LtdDongying 257000China

A new method for regulating the synthesis of Ni Mg Fe hydrotalcites(NMF LDHs) with the addition of hydroxyl compounds was proposed. A series of NMF LDHs were prepared by the above method, and then were calcined to obtain the Ni Mg FeOx(NMFOx) samples. The NMFOxsamples were characterized by XRD,SEM, TG-DTG, XPS and CO2-TPD, respectively. The catalytic performance of NMFOxfor depolymerizing calcium lignosulfonate(CLS) was evaluated by hydrothermal reaction. The results showed that the addition of hydroxyl compounds favored reducing the particle sizes of NMF LDHs. For the depolymerization of CSL, the yield of liquid product increased from 45% to 75.8% with the addition of NMFOx-ethanol(NMFOxET). The liquid products were mainly phenolics, aromatics, ketones and esters. The total selectivity of oxy-containing compounds was over 90.6%, among them, the phenolics were approximately 35.2%. The valence of Ni and Fe, crystalline phase and basicity almost remained unchanged. The NMFOx-ET samples were recycled for the depolymerization of CLS, moreover, the NMFOx-ET samples had high activity and stability after 4 cycles.

关键词： Hydrotalcite Calcium lignosulfonate Depolymerization Oxy-containing compounds

A general strategy for bimetallic Pt-based nano-branched structures as highly active and stable oxygen reduction and methanol oxidation bifunctional catalysts

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Nano Research 2020年第3期13卷 638-645页

作者： Wenjuan Lei Menggang li lin He Xun Meng Zijie Mu Yongsheng Yu Frances MRoss Weiwei Yang Key Laboratory of Functional Materials Physics and chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China Ministry of Industry and Information Technology Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Bioelectrochemistry&Environmental Analysis of Gansu Province College cf Chemistry&Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China Department of Materials Science and engineering Massachusetts Institute cf TechnologyCambridgeMA 02139USA

The morphology and size of Pt-based bimetallic alloys are known to determine their electrocatalytic performance in reactions relevant to fuel ***,we report a general approach for preparing Pt-M(M=Fe,Co and Ni)bimetallic nano-branched structure(NBs)by a simple high temperature solution-phase ***-prepared Pt-M NBs show a polycrystalline structure and are rich in steps and kinks on the surface,which promote them favorable bifunctional catalytic properties in acidic electrolytes,specifically in terms of the oxygen reduction reaction(ORR)and methanol oxidation reaction(MOR).Specially,Pt-Co NBs/C catalyst shows 6.1 and 5.3 times higher in specific activity(SA)and mass activity(MA)for ORR than state-of-the-art commercial Pt/C catalysts,***,it exhibits a loss of 4.0%in SA and 14.4%in MA after 10,000 cycles of accelerated durability tests(ADTs)compared with the initial *** addition,we also confirmed the superior MOR activity of Pt-Co NBs/C catalyst in acidic *** Pt-M NBs with other alloying metals,the ORR and MOR activities are both higher than commercial catalysts and are in the sequence of Pt-Co/C>Pt-Fe/C>Pt-Ni/C>commercial Pt/C(or PtRu/C).The improved activities and durability can benefit from the morphological and compositional *** synthesis approach may be applied to develop bifunctional catalysts with enhanced ORR and MOR properties for future fuel cells designs.

关键词： Pt-based bimetallic alloy nano-branched structure electrocatalysts,oxygen reduction reaction methanol oxidation reaction

Construction of Highly Efficient Photocatalyst with Core-Shell Au@Ag/C@SiO_(2)Hybrid Structure towards Visible-light-Driven Photocatalytic Reduction

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Chinese Journal of chemistry 2021年第10期39卷 2865-2872页

作者： Huiqin An Shunyuan Xiao Xiaohui Zhao lifang Cao Ting liu Mengzhu li Bing Wang Zhen Yin State Key Laboratory of Separation Membranes and Membrane Processes&school of chemistry and chemical engineering Tiangong UniversityTianjin 300387China Second Oil Production Plant in chongqing Oilfield QingyongGansu 745106China Beijing Institute of Aerospace Testing Technology Beijing 100048China College of chemical engineering and Materials Science Tianjin University of Science and TechnologyTianjin300457 China

Main observation and conclusion Herein,we report a rational construction of Au@Ag/C@SiO_(2)system with Au@Ag core-shell nanoparticles(NPs)as a promising photocatalyst based on the plasmonic coupling effect for the first time towards the photoreduction of nitroaromatic compounds under visible *** combination and elaborate construction of Au@Ag NPs,carbon microspheres and mesoporous SiO_(2)shell can endow this system with several outstanding features towards photocatalytic ***,the broadband light harvesting across ultraviolet-visible-near infrared(UV-vis-NIR)region can be achieved due to the comprehensive effect of surface plasmonic resonance(SPR)coupling model of Au and Ag,near-field scattering light of carbon microspheres and light reflecting effect of SiO_(2)shell,resulting in the production of more electrons for phororeduction ***,the carbon microspheres in Au@Ag/C@SiO_(2)system possess electron-rich property due to their strong electron-withdrawing ability,which can act as the Lewis acid and Lewis basic site,and promote the stepwise hydrogenation of ***,Au@Ag/C@SiO_(2)exhibits excellent reusability because of the protection of SiO_(2)shell,which restricts metal NPs inside the spheres and protects them from aggregation and being lost during reaction *** present work demonstrates the significance of construction of hybrid nanostructures based on the plasmonic coupling effect,which can be a promising approach to design efficient photocatalyst towards organic synthesis under visible light.

关键词： Au@Ag nanoparticles Surface plasmon resonance Carbon microspheres Si0_(2)shell Photocatalysis

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己二腈的生产和应用

现代化工 2024年第S1期44卷 80-86页

作者：卢严钦鹏杨子建刘鑫叶雪涵谭诗怡李龙燕南京信息工程大学雷丁学院江苏南京210044 南京信息工程大学化学与材料学院江苏南京210044

己二腈是生产尼龙66的主要原料,目前全球市场对其需求量正不断增加;此外,己二腈还可用于储能与动力电池领域。对己二腈的合成工艺现状及其新型应用进行了总结和分析,以期引起研究者对己二腈生产及应用开发的重视,使其得到进一步发展。

关键词：己二腈生产技术应用新能源

A high-surface-area silicoaluminophosphate material rich in Brnsted acid sites as a matrix in catalytic cracking

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Journal of Natural Gas chemistry 2012年第6期21卷 685-693页

作者： Shaoiun Xu Qiang Zhang Zhaoxuan Feng Xiaojing Meng Tongyu Zhao Chunyi li Chaohe Yang Honghong Shan State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266555ShandongChina school of chemical Science and engineering KTH Royal Institute of TechnologySE 10044StockholmSweden Mork Family Department of chemical engineering and Materials Science University of Southern CaliforniaCA 90089Los AngelesUSA

A transparent gel-like mesoporous silicoaluminophosphate material （SAP） with molar ratio of Si/Al = 20 was synthesized by hydrothermal method. The physicochemical features of SAP were characterized by XRD, XRF, BET, SEM and FT-IR spectroscopy of pyridine adsorption techniques. The results indicated that incorporation of phosphorus （P） into aluminasilica system altered the basic textural characteristics of aluminasilica. Especially after hydrothermal treatment, the material with large special surface area （up to 492 m2/g） exhibited a good performance on hydrothermal stability. Moreover, the phosphorus modifier can not only increase the amount of Br／＂{o}nsted acidic sites （up to 48.44 μmol/g） and the percentage of weak acidic sites in total acidic sites, but also regulate the acid type, such as the ratio of B/L （Lewis acid/Br？nsted acid） increased to 1.15. The performances of samples as matrices for the catalytic cracking of heavy VGO were investigated. At 520 ℃, the catalysts showed much higher gasoline and diesel oil yields achieving to 45.59 wt% and 19.20 wt%, respectively, and lower coke selectivity （2.86%） than conventional FCC matrices, such as kaolin and amorphous silica-alumina.

关键词： silicoaluminophosphate hydrothermal stability Br nsted acid sites mesoporous hydrothermal synthesis