AICHE JOURNAL
·
2017
·Vol. 64
·期 2
·538-549
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IF 2.836
Yiyi Sheng,Yang Sun,Jing Xu,Jie Zhang,Yi-Fan Han
Cu-embedded mesoporous alumina, as a Fenton-like catalyst prepared via a sol-gel method, showed excellent activity and durability for the degradation of refectory compounds. The origin of active sites for the generation of hydroxyl radicals (•OH) were thoroughly studied using multitechniques. Cu, as the only active element, could be penetrated into the bulk of alumina and some Cu atoms were embedded into the framework. The dynamic structure of surface Cu species (the variety of Cu + /Cu 2+ ratio) during the reaction were determined as well. Furthermore, the structure plasticity of catalyst has proved by optimizing preparation and reaction conditions. A 98.53% degradation of RhB was recorded within 30 min, following a pseudo-first-order reaction rate expression. Electron spin resonance spectra and •OH scavenging experiments have confirmed that •OH is the main reactive oxidant for the elimination of RhB. By the surface-enhanced Raman spectroscopy and gas chromatography-mass spectrometer results, plausible pathways of RhB degradation were elaborated. © 2017 American Institute of Chemical Engineers AIChE J , 64: 538–549, 2018
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REACTIVE & FUNCTIONAL POLYMERS
·
2016
·
IF 2.725
Luanluan Zhang,Hejun Gao,Yunwen Liao
A series of functional cross-linked polymer (Poly(AMPS- co -DVB)) were synthesized by 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and divinylbenzene (DVB). The physicochemical properties of the Poly(AMPS- co -DVB) were characterized by FT-IR, TGA , SEM, XRD , Zeta potential and UV–Vis. Those results showed that the Poly(AMPS- co -DVB) could provide mounts of adsorption sites from its special structure. The effects of the initial pH, dosage, contact time, and temperature on the adsorption of Rhodamine B (RhB) onto the Poly(AMPS- co -DVB) were investigated. It was found that the initial pH was an important factor for the molecules form of RhB and the surface formation of Poly(AMPS- co -DVB). With increasing of molar ratio of AMPS/DVB, the adsorption efficiency increased gradually. In the adsorption process , both physical and chemical mechanism is presence to adsorb RhB. The maximum adsorption capacity could get 407.9 mg/g within 2 h at room temperature .
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 4
·869-876
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IF 1.3
Zhang Yanwei,Wang Yanze,Li Junguo,Xie Jingjing,Wang Wenxuan,Fu Zhengyi
We synthesized BiVO 4 mesocrystals with ordered assembly structure, and studied the structural order and the relationship between the photodegradation of Rhodamine B. Au nanoparticles (NPs) were successfully loaded onto Meso-BiVO 4 by light-assisted induction, and Cd nanoparticles were further selected to be deposited on Au nanoparticles to form Z-scheme photocatalyst Meso-BiVO 4 -Au-CdS heterostructures. We try and propose to analyze its ordered assembly structure by XRD for the first time. The results show that Meso-BiVO 4 is a mesocrystal with highly exposed (001) plane and directional assembly structure. The charge separation efficiency of all samples was studied by PL spectroscopy. The results show that the Z-scheme Meso-BiVO 4 -Au-CdS can promote the charge separation and obtain the best carrier separation efficiency. Thus, it has the best photocatalytic activity in the experiment of photocatalytic degradation of rhodamine B. The main active species in the degradation process were confirmed by free radical trapping experiment, and the degradation mechanism was put forward.
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Materials Today Communications
·
2024
·
IF 3.7
Rui Luo,Yuting Huang,Min Wang,Tong Yu,Kexin Tai,Lin Hu,Xiankun Wu
Advanced oxidation processes based on persulfate (PS-AOPs) have emerged as effective strategies for environmental remediation, with cobalt-based oxides serving as prominent catalysts for peroxymonosulfate (PMS) activation. In this study, we developed a highly active Co 3 O 4 /Al 2 O 3 catalyst (Co/AA) featuring ultrafine nanoparticles, synthesized via a facile approach using tannic acid (TA) as a coordinating agent and activated alumina as a robust support. Co/AA-0.1, as the representative catalyst, was characterized and exhibited outstanding performance in degrading rhodamine B (RB) via PMS activation. Our findings highlight TA's critical role in reducing Co 3 O 4 nanoparticle size, thereby increasing the availability of active sites. The degradation mechanism was elucidated through reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis, revealing that sulfate radicals (SO 4 •− ) are the dominant ROS. The high activity of Co/AA-0.1 is confirmed by analyzing X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area and O 2 -temperature programmed desorption data of the samples. We also investigate the effects of various factors, such as anions, reaction temperatures, and PMS dosage, on RB degradation. Higher temperatures for treating the catalyst are found to reduce activity but improve stability. Notably, the catalyst synthesized through EDTA-assisted synthesis showed balanced activity and stability. Furthermore, the versatility of our synthesis method was demonstrated by successfully applying it to other supports, such as SiO 2 and TiO 2 , offering the development of more efficient and stable catalysts for environmental applications.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yao Feng,Shuyi Lai,Le Yang,Ralf Riedel,Zhaoju Yu
Polymer-derived porous Bi 2 WO 6 /SiC(O) nanocomposites were prepared by a simple mechanical mixing of Bi 2 WO 6 nanopowders with a polyorganocarbosilane, namely allylhydridopolycarbosilane (AHPCS), followed by pyrolysis of the resulting blend at 700 °C for 2 h. The Bi 2 WO 6 nanopowders were synthesized by the reaction between Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 and characterized by means of X-ray diffraction (XRD) and dynamic light scattering (DLS). The cross-linking and polymer-to-ceramic transformation of the physically blended Bi 2 WO 6 /AHPCS were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). TEM studies revealed that the final ceramic composite is comprised of Bi 2 WO 6 nanoparticles homogeneously embedded in a polymer-derived SiC(O) matrix. Nitrogen sorption isothermal analysis showed the meso-macroporous feature of resultant Bi 2 WO 6 /SiC(O) nanocomposites. Finally, the porous Bi 2 WO 6 /SiC(O) composites show a high photodegradation efficiency (ca. 90%) towards a model organic dye Rhodamine B (RhB) under UV irradiation. Therefore, the synthesized ceramic composite has to be considered as a promising candidate material for purification of water contaminated with organic dyes.
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Advanced Sustainable Systems
·
2024
·Vol. 8
·期 12
·2400419
·
IF 6.5
Dongxu Han,Zhi Song,Boxia Liu,Bofei Liu,Xiayan Zhang,Jialu Liu,Yeqiong Huang,Chuhan Xing
Because of its excellent catalytic activity and stability, perovskite materials are widely used in advanced oxidation processes to remove refractory organic pollutants. In this study, a series of catalysts Pr 0.6 Sm 0.4 Co x Mn 1-x O 3 (x = 0, 0.2, 0.4, 0.5, 0.6,0.8 and 1) with limited range effect are prepared by sol–gel method with the regulation strategy of injecting active metal Co at B site in the crystal lattice of perovskite catalyst Pr 0.6 Sm 0.4 MnO 3 . Under the optimal conditions, the Pr 0.6 Sm 0.4 Co 0.8 Mn 0.2 O 3 /PMS/RhB system showed superior catalytic performance, and the removal rate of Rhodamine B (100 mg L −1 ) is close to 100% within 40 min. In addition, the Pr 0.6 Sm 0.4 Co 0.8 Mn 0.2 O 3 catalyst has a wider pH (2-10) tolerance range and still has outstanding catalytic properties after multiple cycle tests. The quenching experiment and EPR test confirmed that a variety of active species are produced in the system, and the singlet oxygen as the leading path of a variety of active substances assisted to promote the efficient degradation of Rhodamine B in wastewater. This study provides a new reaction system and regulatory strategy of active structural sites for the design of Fenton-like catalytic systems based on novel perovskite oxides.
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JOURNAL OF NANOPARTICLE RESEARCH
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2024
·Vol. 26
·期 9
·1-15
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IF 2.1
Yin Yanbing,Zhang Xueli,Jiang Bei,Wang Zhou,Feng Yongming,Li Xueying
Developing efficient catalysts for visible light reactions is vital in the field of photocatalysis. This study focuses on the synthesis of novel ternary composites (α-DMACoPc/TiO 2 /MIL-101 (Fe)) by leveraging the excellent adsorption properties of MIL-101 (Fe), the photosensitizing capabilities of phthalocyanine, and the photocatalytic potential of TiO 2 . The nanocomposites’ structural and optical attributes were thoroughly analyzed. X-ray powder diffraction (XRD) was utilized to showcase the crystalline nature of the composites. Furthermore, Fourier transform infrared (FT-IR) studies confirmed the formation of ternary nanocomposites. Optical absorption investigations demonstrated the tuning of the optical band gap from the UV to the visible range. The results indicated that nearly 94% of the organic material was decomposed after 150 min of exposure to simulated sunlight from a xenon lamp. This high efficiency can be attributed to the synergistic interaction among the composites, enhancing light absorption. The composite’s robust stability was evidenced through cyclic tests. Valuable information was provided to advance the design and synthesis of photocatalysts consisting of metal–organic frameworks synergized with semiconductors. Exploring the possibility of mesoporous materials was based on MOFs for photodegradation of organic pollutants. The photocatalytic degradation of organic pollutants by MOFs mesoporous materials was also investigated. The potential of composite materials in the field of dye degradation of industrial waste is confirmed. The good recycling photocatalytic reusability indicates the promising application of this photocatalyst. Graphical Abstract
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 236
·期 1
·1-15
·
IF 3.8
Li Xiao-fang,Ding Yue,Wang jing,Feng Xiao-qiang
Based on the excellent adsorption, photosensitization and electron transfer ability of biochar, the combination of photocatalyst and biochar is an effective method to improve the overall photocatalytic activity. Hence, a novel efficient CS-biochar/ZnO/TiO 2 photocatalyst with the different content of N-doped porous CS-biochar were constructed and characterized by a variety of testing methods, such as FT-IR, XRD, UV–vis DRS, SEM–EDS, PL, EIS, TPR, LSV. Photocatalytic experiments indicated that all the CS-biochar/ZnO/TiO 2 composites with different CS-biochar content exhibit excellent photocatalytic activity for Rh B degradation. Among them, 63%-CS/ZnO/TiO 2 composite has the best catalytic activity, which 94.5% of Rh B was degraded within 25 min, and the kinetic constant was 0.0993 min −1 , which is about 1.96 and 1.72 times that ZnO (0.0507 min −1 ) and TiO 2 (0.0576 min −1 ), respectively. Moreover, photoelectrochemical experiment results confirmed that CS-biochar/ZnO/TiO 2 greatly enhanced the charge separation process compare with ZnO and TiO 2 . Meanwhile, CS-biochar/ZnO/TiO 2 has excellent stability, and a possible photocatalytic mechanism was put forward.
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BULLETIN OF MATERIALS SCIENCE
·
2017
·Vol. 40
·期 1
·187-193
·
IF 0.899
GENG TONG-MOU,WANG XIE,ZHU FENG,JIANG HUI,WANG YU
The water-soluble polymeric chemosensor poly(AM-GRBD) has been synthesized by precipitation copolymerization with the functional monomer, GRBD, which was made of N \(^{\boldsymbol {\prime \prime }}\) -(rhodamine B-yl) diethylenetriamine and glycidyl methacrylate (GMA) and a hydrophilic co-monomer acrylamide (AM). The chemical sensor behaved as a fluorescent and chromogenic sensor towards various heavy metal cations and transition metal cations; particularly, Cr 3+ , Fe 3+ and Hg 2+ ions in completely aqueous media. The fluorescence of poly(AM-GRBD) was enhanced by Cr 3+ , Fe 3+ and Hg 2+ metal ions. Moreover, during titration of Cr 3+ , Hg 2+ or Fe 3+ to the aqueous solution of poly(AM-GRBD), the visual colour changed from colourless to pink or brown yellow under visible light.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zhixian Du,Yuan Gao,Zhuanzhuan Liang,Yanqing Yang,Weike Zhang
In this work, the Bi 2 WO 6 /KCC-1 photocatalytic composite was prepared by hydrothermal method using Bi 2 WO 6 as photocatalyst and KCC-1 as cocatalyst, for degradation of Rhodamine B (RhB). The result shows that when the mass percentage of KCC-1 in the composite is 7 % (BK-3), the photocatalytic degradation efficiency is the highest, reaching 90.63 %. Furthermore, the BK-3 composite shows a well degradation activity (83.90 %) even after four consecutive cycles of photocatalysis. Characterization of the photocatalyst by various testing techniques show that the BK-3 composite presents high visible light response, narrow energy band, and strong separation of photogenerated carriers. The results of free radical capture experiments indicate that the main active substance in the degradation of RhB under visible light is h + and ·O 2 − also plays a certain auxiliary role. This study offers promising prospects for the preparation of highly efficient photocatalysts through the modification of bismuth-based materials.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Hanyue Xue,Min Yu,Kunyi He,Yingnan Liu,Yuanyuan Cao,Yuhang Shui,Jing Li,Muhammad Farooq,Li Wang
Herein, a novel bimodal ratiometric probe for sensitive and selective detection of biothiols (including glutathione (GSH), cysteine (Cys) and homocysteine (Hcys)) was constructed, which was based on the redox reaction between manganese dioxide nanoflakes (MnO 2 NFs) and rhodamine (RhB) and biothiols. When MnO 2 NFs was added into RhB solution, RhB was oxidized to a series of derivatives, accompanying with the colorimetric color changing from purple to light pink and fluorescence changing from red to green. In the presence of GSH, Cys or Hcys, they could reduce MnO 2 NFs to Mn 2+ , thereby preventing the following oxidization of RhB and the corresponding color and fluorescence changes. The absorption intensity ratio and fluorescence intensity ratio showed good linear relationships with the concentrations of biothiols. The colorimetric detection limits for GSH, Cys and Hcys were 0.057 μM, 0.140 μM and 0.087 μM, respectively. And the fluorescence detection limits were 0.177 μM, 0.282 μM and 0.161 μM. More importantly, this probe was successfully applied to monitor the concentration of GSH/Cys/Hcys in human serum samples, with satisfactory recovery. Thus, this MnO 2 NFs-RhB platform can potentially be a candidate for the detection of biothiols.
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Lantian Su,Song Wang,Lumei Wang,Zhiyu Yan,Haoyang Yi,Dongwei Zhang,Guoqing Shen,Yun Ma
This paper proposes a fluorescent aptasensor for the detection of carbendazim (CBZ) in aqueous solution using CBZ-specific aptamer as sensing probe, gold nanoparticles (AuNPs) and Rhodamine B (RhoB) as indicator, respectively. In the absence of CBZ, CBZ aptamer could wrap AuNPs and maintained it dispersed in NaCl solution basically. Contrarily, the aptamer could specifically combine with CBZ and form a stable aptamer-CBZ complex, leaving AuNPs exposed to be aggregated by NaCl solution. The dispersed AuNPs could efficiently quench the fluorescence of RhoB, but those aggregated AuNPs have poor capability to impair the fluorescent indicator . Thus, the concentration of CBZ could be detected quantitatively through the distinction of the fluorescence intensity . This convenient fluorescent assay for CBZ had a wide linear range from 2.33 to 800 nM and a 2.33 nM limit of detection (LOD). Furthermore, it had high selectivity over pesticides, antibiotics, metal ions and other disrupting chemicals. As for application, the method could determine CBZ in water samples with recoveries in the range of 96.3–111.2%. This fluorescent aptasensor possessed great potential application for CBZ detection in actual aquatic environment.
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