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Degradation of Rhodamine B by MnFe-LDH/PMS/O_(3) three-phase catalytic system: performance, mechanism and ecotoxicity studies

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 111-127页

作者： Ying Han Ying Yang Weibao Liu Yilong Hou Ce Wang Jiangwei Shang Xiuwen Cheng Key Laboratory of Pollutant Chemistry and Environmental Treatment College of Chemistry and Environmental ScienceYili Normal UniversityYining 835000China Key Laboratory for Environmental Pollution Prediction and Control of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

This study developed a novel MnFe-LDH/PMS/O3 three-phase catalytic system to degrade the organic dye Rhb, which was used to address the drawbacks of persulfate oxidation and ozonation techniques. The structure, ionic and elemental composition, specific surface area, and magnetic properties of the LDHs were investigated using a variety of physicochemical characterization tools. The results showed that MnFe-LDH had a large specific surface area, a rich crystalline phase composition, and a functional group structure. The Rhb degradation rate of MnFe-LDH/PMS/O3 was 0.34 min−1, which was much higher than that of other comparative systems. Rhb could be completely degraded in 10 min after optimization and had a significant effect on TOC removal. The system was found to be effective over a wide pH range. Common anions were largely unaffected and humic acid acted as an inhibitor. At the same time, the system had generally effective degradation performance for different dyes. Combined with quenching experiments and EPR, it was found that SO4•−, •OH, O_(2)•−, and 1O_(2) all participated in the reaction, and •OH contributed more. The degradation pathway of Rhb was derived by LC-MS, and the T.E.S.T. evaluation found that the toxicity of the intermediate product was significantly reduced. Finally, the stability and availability of LDHs were verified using cycling experiments and metal ion leaching. This work provides a theoretical basis and data support for the synergistic catalysis of PMS/O3 and the deep treatment of dye wastewater.

关键词： Rhodamine B Layered double hydroxides Peroxymonosulfate Ozonation

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Hollow Co/CoO/Carbon nanofibers promoted PMS decomposition for the degradation of Rhodamine B

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Journal of Materials Science & Technology 2023年第26期157卷 120-129页

作者： Zhende Li Xiaoyan Zhang Guangzhen Li Fengjin Han Dongqi Hu Xiaoyu Huang Hua Yuan Yeqiang Tan State Key Laboratory of bio-Fibers and Eco-Textiles&Institute of Marine biobased Materials&Collage of Materials Science and Engineering Qingdao UniversityQingdao 266071China

Carbon nanofibers with hollow structures have an excellent application prospect in various fields be-cause of their high specific surface area and abundant active sites.PAN-based hollow carbon nanofiber doped with Co/CoO(H-Co/CoO-CNF)was successfully prepared and used as a catalyst to activate perox-ymonosulfate(PMS)and degrade Rhodamine B(Rhb).The catalyst showed a surprising degradation rate(98.89%)of Rhb within 15 min and had good degradation performance in a wide pH range(pH 1.5-11.2).Compared with solid fibers,H-Co/CoO-CNF shows better cyclic characteristics.The catalyst is also mag-netic and recoverable easily due to the addition of Co/CoO.Two pathways of both radical(SO_(4)·^(−))and non-radical(^(1)O_(2))exist during the Rhb degradation process are confirmed through electron paramagnetic resonance(EPR)analysis and radical quenching experiments.This work provides a new idea for hollow fibers loaded with metals and their oxides and can guide the development of catalysts for advanced oxi-dation processes in the future.

关键词： Electrospinning Hollow fiber Co/coO Radical and non-radical Rhodamine B

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One-step preparation of MoO_(x)/ZnS/ZnO composite and its excellent performance in piezocatalytic degradation of Rhodamine B under ultrasonic vibration

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Journal of Environmental Sciences 2023年第3期125卷 1-13页

作者： Song Zheng Xiaojing Li Jiayu Zhang Junfeng Wang Chunran Zhao Xin Hu Ying Wu Yiming He Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China

This paper synthesized a new type of ternary piezoelectric catalyst MoO_(x)/ZnS/ZnO (MZZ)by a one-step method.The catalytic degradation of Rhodamine B (Rhb) solution (10μg/g,pH=7.0) shows that the composite catalyst has excellent piezoelectric catalytic activity under ultrasonic vibration (40 k Hz).The piezoelectric degradation rate of the optimal sample reached 0.054 min^(-1),which was about 2.5 times that of pure ZnO.X-ray diffraction(XRD),X-ray photoelectron spectroscopy (XPS),Raman,transmission electron microscopy(TEM),scanning electron microscopy (SEM),and electrochemical impedance spectroscopy(EIS) technologies were used to analyze the structure,morphology,and interface charge transfer properties of the MZZ piezocatalysts.The results showed that the composite catalyst may have a core-shell structure.ZnS is coated on the surface of ZnO,while MoO_(x)adheres to the surface of ZnS.This structure endowed MZZ larger specific surface area than ZnO,which benefits the Rhb adsorption.More importantly,the formed heterojunction structure between ZnS and ZnO promotes the separation of positive and negative charges induced by the piezoelectric effect.MoO_(x)species may act as a charge trap to further promote more carriers to participate in the reaction.In addition,MoO_(x)may also be beneficial in adsorbing dyes.Active species capture experiments show that superoxide radicals and holes are the main active species in piezoelectric catalytic reactions on MZZ catalysts.

关键词： ZnO ZnS MoO_(x) Piezocatalytic Rhodamine B Core-shell structure

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Functionalized nanographene oxide/PEG/Rhodamine B/gold nanocomposite for electrochemical determination of glucose

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Journal of Materials Science & Technology 2022年第27期122卷 141-147页

作者： Wenhao Qian Tao Song Mao Ye Xiaoyu Huang Yongjun Li bingjie Hao Department of Stomatology Shanghai Xuhui District Dental Center 500 Fenglin RoadShanghai 200032China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisChinese Academy of SciencesShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesShanghai 200032China

Diabetes,one of the most serious metabolism diseases,has continually plagued human beings so that timely monitored blood glucose level is very necessary.Gold nanoparticles(Au NPs)have been considered as potential substitutes for non-enzymatic sensors,due to their unusual physicochemical property and efficient catalytic activity.Herein,we prepared a facial platform for Au NPs to maintain good dispersity and inherent physicochemical property.In this special platform(SH-n GO-PEG-Rh b),nanographene oxide(n GO)was employed as an ideal base,which provided adequate carboxyls for conjugating with poly(ethylene glycol)(PEG),and enough epoxy groups for thiol active site.A functional dye(Rhodamine B)with preferable fluorescence properties was also introduced into this platform.Au NPs were then aptly in situ grown on the platform via reduction of HAuCl_(4) under mild conditions,providing Au NPs@SHn GO-PEG-Rh b.The nanocomposite was cast on a glassy carbon electrode(GCE)conveniently,yielding GCE/Au NPs@SH-n GO-PEG-Rh b.Reasonably,as shown by cyclic voltammetry(CV)and ready-state amperometry,GCE/Au NPs@SH-n GO-PEG-Rh b was capable of electrochemical determination of glucose so as to provide an efficient sensor for glucose determination with dye tracer.

关键词： Nano-graphene oxide Gold nanoparticles Glucose biosensor Rhodamine B

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Photocatalytic Degradation of Rhodamine B by Recyclable Ag br/Polypyrrole(PPy)Nano-Catalysts

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1198-1204页

作者： YIN Xiaogang LIU Xinyun LI Hang WU Huimin FU Hai GONG Wei Key Laboratory of Functional Materials Chemistry of Gui Zhou Province School of Chemistry and Materials ScienceGui Zhou Normal UniversityGuiyang 550001China School of Pharmaceutical Sciences Guizhou Medical UniversityGuiyang 550025China

We investigated the removal of the organic dye Rhodamine B in wastewater with recyclable Agbr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAb)as both the soft-templating agent and the bromine source,a series of Agbr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis procedure.The synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and Agbr led to increased thermal stability.Chemical combination of PPy and Agbr was observed through XRD and XPS analyses.For the morphology study,the Agbr particles were found to be well dispersed in the PPy nanowire network from SEM results.In the photodegradation experiments,up to 92%Rhodamine B was degraded by the Agbr/PPy catalysts in the period of 1 hour under 254 nm UV light.The catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test.

关键词： polypyrrole Agbr photocatalysts Rhodamine B

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Effect of doped strontium on catalytic properties of La_(1-x)SrxMnO_(3) for Rhodamine B degradation

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Journal of Rare Earths 2021年第11期39卷 1362-1369,I0002页

作者： Jiaxiu Guo YueJing Ting Shen Hongdi Luo Juan Liang Shandong Yuan College of Architecture and Environment Sichuan UniversityChengdu 610065China National Engineering Technology Research Center for Flue Gas Desulfurization Chengdu 610065China Institute of New Energy and Low Carbon Technology Sichuan UniversityChengdu 610065China

A series of La_(1-x)Sr_(x)MnO_(3) samples were prepared by sol-gel method and used to degrade Rhodamine B(Rhb) in water.All samples were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),N_(2) adsorption-desorption,temperature-programmed reduction of H_(2)(H_(2)-TPR) and temperature-programmed desorption of O_(2)(O_(2)-TPD).The results show that the degradation of Rhb is highly dependent on the initial pH value of solution.Sr doping enhances the degradation ability of LaMnO_(3) for Rhb in the time range of 0-40 min under a strong acidic environment,but all samples exhibit similar degradation rate from 40 to 60 min.In La_(0.7)Sr_(0.3)MnO_(3)-Rhb reaction system,there are two different degradation pathways,including N-de-ethylation,chromophore cleavage,ring-opening and mineralization.La_(1-x)Sr_(x)MnO_(3)(x ≤0.3) has the perovskite structure of La-Mn oxides,while La_(0.6)Sr_(0.4)MnO_(3) exhibits a Sr_(0.4)MnLa_(0.6)O_(2).98 perovskite phase.Sr doping leads to distortion of rhombohedral crystal structure and increases the relative content of Mn^(4+).The perovskite structure is stable in strong acidic environment during Rhb degradation,but the relative content of Mn^(4+)and Mn^(3+) on the material surface changes.Sr doped LaMnO_(3) achieves specific surface area of 58.8 m^(2)/g and total pore volume of 0.152 cm^(3)/g.Furthermore,Sr^(2+)doping improves redox properties of La-Mn oxides,and the presence of defects makes oxygen diffusion easier compared with the undoped samples.

关键词： Organic pollutant Degradation Rhodamine B LaMnO_(3) Sr Perovskite

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Mg(NO_(3))_(2)·6H_(2O)-Assisted insitu-Fabrication of Tea Residual biochar for Ultra-Fast and High Adsorption of Rhodamine B

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Wuhan University Journal of Natural Sciences 2024年第2期29卷 165-176页

作者： HU Dandan XUE Yangfan LIU bo WU Yongjuan LI Zichen School of Chemistry&Chemical Engineering Shaanxi Xueqian Normal UniversityXi'an 710100ShaanxiChina Safe College Xi􀆳an University of Science and TechnologyXi'an 710054ShaanxiChina

In this work,porous biochar(MN-TRb_(750))was fabricated via direct pyrolysis of tea residue(TR)and Mg(NO_(3))_(2)·6H_(2)O(MN).The as-synthesized MN-TRb_(750) reached a specific surface area of 839.54 m^(2)·g^(-1)and an average pore size of 3.75 nm with multi-level pore architecture.MN decreased TR's carbonization temperature and promoted the aromatics extent,pore structure for the frizzly flake-like biochar.Rhodamine B(Rhb)was chosen as the adsorbate to explore the removal performance of organic dyes in this study.The results indicated that the maximum adsorption capacity of Rhb on MN-TRb_(750) at 20℃ is up to 809.0 mg·g^(-1)with isotherms fitted well to Freundlich and Dubinin-Radushkevic models.The adsorption kinetics followed pseudo-second-order and Elovich models with an equilibrium adsorption capacity of 757.6 mg·g^(-1)as the initial concentration of Rhb is 260 mg·L^(-1).High pore filling,hydrogen bond,π-πinteraction determined the adsorption of Rhb onto MN-TRb850 through a multi-active center and exothermic chemical sorption process.

关键词： Mg(NO_(3))_(2)·6H_(2)O porous biochar mechanism Rhodamine B adsorption

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Fabrication of Cu/rGO/MoS2 nanohybrid with energetic visible-light response for degradation of Rhodamine B

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Chinese Chemical Letters 2019年第12期30卷 2245-2248页

作者： Huanjing Liang Peng Hua Yufei Zhou Zhimin Fu Jiaoning Tang Junfeng Niu Shenzhen Key of Special Functional Materials College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China

A novel visible-light-driven Cu/rGO/MoS2(CRM) ternary nanostructure as a photocatalyst with high catalytic activity towards environmental purification using solar energy was successfully synthesized through a facile solvothermal method.It was found that the nanoflower structure of MoS2 increased the number of its exposed edges.Meanwhile rGO as a catalytic substrate played a role of charge-carrier channel to improve the separation of holes and electrons,which originated from the band gap absorption of MoS2.The content of Cu in photocatalyst affected photocatalytic performance obviously.And the optimal 30% Cu/rGO/MoS2 possessed the highest photocatalytic performance,which could be attributed to the improved separation of charges and synergistic effects among Cu,rGO and MoS2.The removal efficiency of Rhodamine B(Rhb) over CRM was up to 100% in 5 min.CRM as a photocatalyst maintained good reproducibility and stability during 3 times of the recycle experiments.These results indicate CRM is a promising photocatalyst for degrading organic pollutants in wastewater.

关键词： CRM Ternary nanostructures Photodegradation Rhodamine B

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Surface-enhanced Raman Scattering Effect of Ordered Gold Nanoparticle Array for Rhodamine B with Different Morphologies

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Chinese Journal of Polymer Science 2015年第10期33卷 1470-1476页

作者： Xi-hong Zu Zhi-hui Jian 易国斌 Hai-liang Huang ben-bin Zhong Hong-sheng Luo Jia-rong Huang Cui Wang School of Chemical Engineering and Light Industry Guangdong University of Technology

In this study, well-ordered gold nanoparticle array on silicon substrate was adopted as an active surface-enhanced Raman scattering substrate for detecting Rhodamine B （Rb）, and the influence of Rb morphologies on surface-enhanced Raman scattering （SERS） properties was discussed. The Au nanoparticle array was prepared by using patterned P4VP nanodomains of poly（styrene-b-4-vinylpyridine）（PS-b-P4VP） diblock copolymer thin films as nanoreactors which is a simple and economical approach. The results show that Raman spectra of Rb on the Au nanopaticle array have much stronger intensity than those on the bare silicon substrate by detecting same Rb solution. It indicates that the prepared Au nanoparticle array on silicon substrate has a significant Raman enhancement for Rb. Interestingly, the Raman intensity of Rb from its ethanol solution is much stronger than that from its aqueous solution due to the special morphologies of Rb formed in their ethanol solutions. This work provides an effective approach to prepare highly sensitive and stable surface-enhanced Raman scattering substrate.

关键词： Nanoparticle array Rhodamine B Raman spectroscopy Nanowire Nanograss

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Effect of Cu（Ⅱ） on Degradation and Decolorization of Rhodamine B in Subcritical Water

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Chemical Research in Chinese Universities 2017年第4期33卷 643-647页

作者： CHENG Kai YANG Wei WANG Hui ZHOU Jie WU Shengji YU Tianming PAN Jianbo College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 P. R. China Eanlu Environment Technology Co. Ltd. Quzhou 324000 P R. China

In this paper, subcritical water, an environmentally friendly solvent, was employed to degrade Rhodamine B, which served as a model dye in textile industrial effluents. The effect of Cu（Ⅱ） on the degradation of Rhodamine B was evaluated. Further, the degradation kinetics of Rhodamine B in subcritical water was evaluated via a Weibull model. The results show that subcritical water could efficiently degrade and decolorize Rhodamine B. The addition of Cu（Ⅱ） into subcritical water could accelerate the degradation of Rhodamine B and lower the temperature for its com- plete degradation. The Weibull equation could well express the degradation kinetics of Rhodamine B. The calculated rate constants showed Arrhenius behavior and presented high correlation coefficients. The activation energy was 109.4 kJ/mol for subcritical water degradation of Rhodamine B, whereas it became lower（93.4 kJ/mol） when Cu（Ⅱ） was added to the subcritical water. The frequency factors for the degradation of Rhodamine B by subcritical water without and with Cu（Ⅱ） were calculated to be 1.0×10n and 3.2×109 min-1, respectively. The above results indicate that subcritical water treatment is a promising process for degrading and decolorizing textile dyes. The results will provide a theoretic support for the industrial application of subcritical water treatment.

关键词： Subcritical water Degradation kinetics Rhodamine B Weibull equation Copper ion

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