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Determination of rhodamine b in Food Using HPLCUV Method

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Chinese Food Science 2012年第2期1卷 37-39页

作者： WANG Yong WU Na Jining Entry-exit Inspection and Quarantine bureau

[ Objective] The aim was to establish a method for the determination of rhodamine b in food by HPLC-UV. [ Metkod] rhodamine b was extracted with acetone/hexane from food samples. After concentrated and purified by alumina cartridge, the rhodamine b content in the food was determined by using high performance liquid chromatography with ultraviolet visible detector. [ Result] Within tile concentration range of 0.005 - 2.000 mg/kg, the peak area of rhodamine b presented good linear relation with the concentration, and the related coefficient was 0.999 98. With high average recovery rate, the detection limit of the method was 0.005 mg/kg[ Concision] It is a fast and accurate method with high sensitivity to detect rhodamine b in food.

关键词： Food HPLC-UV rhodamine b Detection China

Photocatalytic Degradation of rhodamine b Using P25,ST-21 and ST-31 in Aqueous Solutions

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Photocatalytic Degradation of Rhodamine B Using P25,ST-21 an...

加速功能材料自主创新，促进西部战略性新兴产业发展——2011中国功能材料科技与产业高层论坛

作者： Qizhao WANG,Jinjin CAO,Ning AN,Zhe ZHANG,Guofou MA,Ziqiang LEI College of Chemistry and Chemical Engineering,Northwest Normal University,Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education,Key Laboratory of Gansu Polymer Materials,Lanzhou,China,730070

Titanium dioxide is an excellent photocatalyst material for environmental *** this paper,photocatalytic activities for the degradation of rhodamine b using different kinds of TiO2 powders(P25,ST-21,ST-31)were investigated under ultraviolet *** the samples were characterized by XRD,FT-IR,UV-visible DRS and *** analysis of XRD indicated that P25 and ST-21 was mixture of anatase and rutile,ST-31 was *** comparing their photocatalytic activities for the degradation of rhodamine b,P25 had the best photocatalytic activity in the all samples.

关键词： Titanium Dioxide Photocatalytic Degradation Ultraviolet Irradiation rhodamine b

Removal of rhodamine b from Aqueous Solutions by Tea Waste

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Removal of Rhodamine B from Aqueous Solutions by Tea Waste

2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： Jun Li Ming-zhen Hu School of Resources and Environmental Engineering Wuhan University of Technology

Adsorption removal of a cationic dye,rhodamine b （Rhb） from water onto the tea waste （TW） was *** effects of several variables on the removal of Rhb were studied,including initial Rhb concentration,pH and contact *** were made to fit the isothermal data using Langmuir and Freundlich *** experimental results have demonstrated that the equilibrium data are fitted well by a Freundlich isotherm ***-first-order and pseudosecond-order models were considered to evaluate the rate *** experimental data were found to follow the pseudo-second-order kinetic *** analysis was also carried out to examine the possible interaction between adsorbent and *** results indicate that the tea waste could be used as a low-cost absorbent for the removal of cationic dyes from aqueous solutions.

关键词： tea waste rhodamine b adsorption

"off-on" fluorescence probe based on rhodamine b

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"off-on" fluorescence probe based on Rhodamine B

中国化学会第五届卟啉与酞菁学术研讨会

作者： Chunpeng Jiao Yuanyuan Liu Pingping Zhang Wenjuan Lu Yanfeng Wang School of Medicine and Life Sciences University of Jinan-Shandong Academy of Medical Sciences Jinan Institute of Materia Medica Shandong Academy of Medical Sciences

Due to its excellent photophysical properties and good photostability,rhodamine b dye is often used as laser dye,reference standard substance for measurement of fluorescence quantum yield,nucleic acid sequence determination,gene detection and marker reagent for disease *** research of rhodamine b fluorescent probe has attracted the attention of many scientists in recent *** mechanism of probe identification is mainly based on the "turn-off" mechanism of rhodamine derivative spironolamide *** is no color when closed and the fluorescence intensity is *** object recognition,the probe’s spironolamide ring is opened to produce color and strong *** b was selected as the fluorophore nucleus,and the reaction with ethylenediamine resulted in the formation of an endoamide spiral ring to quench the fluorescence,and then the new reactive rhodamine b fluorescent probe was modified and designed.

关键词： Fluorescent probe rhodamine b Reactive type

Degradation of rhodamine b in aqueous solution by the UV/ZnO photocatalytic process

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Degradation of Rhodamine B in aqueous solution by the UV/ZnO...

2011 International Conference on Materials for Renewable Energy & Environment(ICMREE 2011)

作者： Jing Zhao Department of Materials Physics and Chemistry State Key Laboratory for Advanced Metals and Materials University of Science and Technology beijing ChinaLi Wang School of Civil&Environmental Engineering University of Science and Technology beijing beijing China

The photocatalytic degradation of rhodamine b（Rb） was studied by using ZnO nanorods as the catalyst under UV light *** effect of the Rb concentration and ZnO catalyst dosage were *** degradation rate reachs maximum when the pH value is about *** reuse of the as- grown ZnO catalysts has little effect on their photocatalytic activity.

关键词： nano-sized ZnO materials rhodamine b photocatalysis

Preparation of cellulose/graphene oxide composite membranes and its applications for rhodamine b adsorption from water

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Preparation of cellulose/graphene oxide composite membranes ...

河南省化学会2016年学术年会

作者： Shuya Tian Zhan Peng Jian Hui Guo Xiuhua Liu Jingwei Zhang College of Chemistry and Chemical Engineering Henan University Engineering Research Center of Nanomaterials Henan University

In the present study, the cellulose/grapheme oxide composite membrane(CGCM) was prepared as a novel adsorbent to dispose of dye wastewater. The morphology and chemical structure of the CGCM composite were characterized by the Fourier transform infrared spectrometer(FT-IR), X-ray diffraction(XRD), and scanning electronic microscope(SEM). The dispersion of graphene oxide in the cellulose was successfully explored by synthesizing various proportions cellulose/grapheme oxide composite membrane, the results finally revealed that the optimum ratio of CGCM is 8:1 by comparing the maximum adsorption volume of the composite material of rhodamine b. Furthermore, the CGCM was very stable and can easily be recycled. The adsorption efficiency of the CGCM for Rh b was still over90% after the fifth cycle.

关键词： rhodamine b Cellulose Graphene oxide Adsorbent

Lactonization of dyes promoted by a coordination cage facilitates cavity-induced chromism as ion mobile detector

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Science China Chemistry 2024年第5期67卷 1554-1560页

作者： Liangliang Zhang Yu Liang Zhifeng Xiao Yuxuan Meng Jinyi Huang Xi Lin Ji Li Hong-Cai Zhou Yu Fang Strait Institute of Flexible Electronics(SIFE Future Technologies)Fujian Normal University and Strait Laboratory of Flexible Electronics(SLoFE)Fuzhou 350017China State Key Laboratory of Chemo/bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Texas A&M UniversityCollege StationTexas 77842-3012USA State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi’an 710072China

Dye molecules often change colors(so-called “chromism”) according to the environment variation. However, they are rarely induced by a catalytic amount of cavity. Through encapsulation in the cavity of a porous coordination cage(PCC-2), rhodamine b(1) is transformed from red quinonoid form(1q) into colorless lactone form(1l) in aprotic polar solutions. The μ4-OH groups in the cavity of PCC-2 are shown to stabilize the uncommon zwitterion intermediate(1z), followed by converting to 1l, thus accelerating the equilibrium. The chromism is catalyzed by 0.25 mol% of PCC-2, and the reaction rate is improved by 80,400times. 1@PCC-2 can be further fabricated to a sol-gel that exhibits ion recognition properties. The resulting encapsulation and stabilization of an unconventional intermediate by a catalytic amount of the coordination cage provides fundamental insights into molecular isomerization and has potential use in chemical sensing.

关键词： porous coordination cage Zwitterion intermediate cavity rhodamine b chromism

Enhancing visible-light-driven NO oxidation through molecular‐level insights of dye-loaded sea sands

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Rare Metals 2024年第2期43卷 543-554页

作者： Yu-Han Li bang-Fu Chen Sónia A.C.Carabineiro You-Yu Duan Ping Tan Wing-Kei Ho Fan Dong Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing400067China Nanchang Institute of Technology Nanchang33044China LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing401331China Department of Science and Environmental Studies The Education University of Hong KongHong Kong999077China

Natural minerals,abundant and easily obtained through simple physical processing,offer a cost-effective and environmentally friendly solution for dyeing wastewater disposal and air pollution *** study investigates the photocatalytic removal of NO using natural different types of dyes,loaded on natural sand,under visible light *** examining various coating concentrations of dyes and sand weights,we discovered that sand loaded with rhodamine b(Rhb)exhibits high activity for the photo-oxidation of NO.A combination results of X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR)and thermogravimetric(TG)analyses confirm the presence of SiO_(2),CaCO_(3),Al_(2)O_(3)and iron oxides as the main components of the ***,studying Rhb-loaded individual components reveals that CaCO_(3)plays a crucial role in enhancing the NO removal *** results and theoretical calculations demonstrate the establishment of a directional charge transfer channel from CaCO_(3)to Rhb,facilitating the adsorption and activation of molecular NO and O_(2).This work not only promotes the utilization of natural mineral resources but also enriches the fields of environmental photochemistry and semiconductor photocatalysis.

关键词： Sand dyes rhodamine b Photo-oxidation of NO Visible light illumination

Coupling of biOCl Ultrathin Nanosheets with Carbon Quantum Dots for Enhanced Photocatalytic Performance

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Transactions of Tianjin University 2024年第3期30卷 211-220页

作者： Pin Song Xiaoyu Fang Wei Jiang Yuyang Cao Daobin Liu Shiqiang Wei Jun Du Lang Sun Lei Zhao Song Liu Yuzhu Zhou Jun Di Chade Lv bijun Tang Jiefu Yang Tingting Kong Yujie Xiong Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Engineering Research Center of Carbon NeutralityCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230029China School of Chemistry and Chemical Engineering National Special Superfi ne Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Nanyang Technological UniversitySingapore 639798Singapore

Over the past few decades,photocatalysis technology has received extensive attention because of its potential to mitigate or solve energy and environmental pollution *** novel materials with outstanding photocatalytic activities has become a research hotspot in this *** this study,we prepared a series of photocatalysts in which biOCl nanosheets were modified with carbon quantum dots(CQDs)to form CQDs/biOCl composites by using a simple solvothermal *** photocatalytic performance of the resulting CQDs/biOCl composite photocatalysts was assessed by rhodamine b and tetracycline degradation under visible-light *** with bare biOCl,the photocatalytic activity of the CQDs/biOCl composites was significantly enhanced,and the 5 wt%CQDs/biOCl composite exhibited the highest photocatalytic activity with a degradation efficiency of 94.5%after 30 min of ***,photocatalytic N_(2)reduction performance was significantly improved after introducing *** 5 wt%CQDs/biOCl composite displayed the highest photocatalytic N_(2)reduction performance to yield NH_3(346.25μmol/(g h)),which is significantly higher than those of 3 wt%CQDs/biOCl(256.04μmol/(g h)),7 wt%CQDs/biOCl(254.07μmol/(g h)),and bare biOCl(240.19μmol/(g h)).Our systematic characterizations revealed that the key role of CQDs in improving photocatalytic performance is due to their increased light harvesting capacity,remarkable electron transfer ability,and higher photocatalytic activity sites.

关键词： Carbon quantum dots biOCl rhodamine b Tetracycline Photocatalysis