FOOD CHEMISTRY
·
2022
·
IF 9.231
Siyuan Tang,Da Chen,Xiameng Li,Changxing Wang,Tingting Li,Jiaxing Ma,Guoqiang Guo,Qinglei Guo
A novel sensor based on dual emissive fluorescent graphene quantum dots is developed for a rapid, selective, sensitive and visual detection of doxycycline (DOX). The ratiometric fluorescent probe is designed by grafting fluorescent group (Rhodamine B, RhB) on F, N -doped graphene quantum dots (FNGQDs). In the presence of DOX, the fluorescence at 466 nm is remarkably quenched due to inner filter effect and fluorescence resonance energy transfer, whereas the peak at 592 nm is attenuated slightly due to the energy transfer in the emission peaks of FNGQDs and RhB functional group. The sensor shows good linear relationship from 0.04 to 100 µM with a low detection limit of 40 nM. Furthermore, the flexible solid-state fluorescent sensing platform is used for detecting DOX in milk, pork and water samples. Therefore, this dual-emission FGQD-RhB can be used as a high-performance fluorescent and visual sensor for food safety and environmental monitoring.
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高影响因子
RSC Advances
·
2026
·Vol. 16
·期 13
·11655-11667
·
IF 6.1
Xin-Yu Yang,Hong-Xi Zhang,Xun Dai,Hao-Jie Zhang,Ye Zhang,Dan Sun,Wei-Liang Tian
The biochar-supported nanoscale zero-valent iron (nZVI@BC) was synthesized in the presence of ultrasonic irradiation and applied in the heterogeneous Fenton-like degradation of rhodamine B (RhB). The property changes in the nZVI@BC synthesized in the presence and absence of ultrasonic irradiation were characterized, which confirmed that the ultrasonically irradiated catalyst had a better dispersion and higher electron transfer rate, showing better catalytic performance for RhB degradation. The effects of the catalyst dosage, pH value and H2O2 concentration were investigated, and it was found that under the conditions of initial pH = 3, H2O2 concentration = 15 mmol L−1, catalyst dosage = 1.5 g L−1 and 298 K, the RhB removal efficiency of nZVI@BC(ultrasonic irradiation) was 97.7%. Furthermore, the classical second-order kinetic model showed better fitting results, suggesting that the RhB degradation was primarily controlled by a chemical reaction, and the activation energy was calculated to be 77.8 kJ mol−1. Based on quenching experiments and electron paramagnetic resonance spectra, free radicals ˙OH and ˙O2− were detected, and ˙OH was found to be the main free radical in RhB degradation. After three cycles of catalyst reuse, its removal efficiency was still more than 70%. This work provides a new route for using ultrasonic irradiation to improve the catalyst performance in Fenton-like systems.
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PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 39
·3881-3889
·
IF 3.532
Jiao Luo,Hongyan Tan,Bin Yang,Donghua Chen,Junjie Fei
In this study, a mesoporous silica fluorescence probe co-doped with manganese-doped zinc sulfide quantum dots (Mn:ZnS QDs) and rhodamine B (RB) and coated with molecularly imprinted polymer (MIP) has been prepared by sol–gel methods. The morphology and structure were characterized in detail by transmission electron microscopy (TEM), Fourier transform-infrared absorption spectroscopy (FT-IR) and ultraviolet-visible absorption spectroscopy (UV-vis). The probe exhibited two characteristic emission peaks at 411 nm and 582 nm, and the synchronous ratiometric fluorescence responses F411/F582 to different concentrations of 4-nitrophenol (4-NP) showed a good linear correlation in the range of 0.01–10 μmol L−1 besides achieving the sensitive detection of 4-NP with a detection limit as low as 3.0 nmol L−1 (3σ). The probe possesses the advantages of selectivity toward the target molecular structure, self-stability in the detection time domain and anti-interference ability, exhibiting excellent potential for application in 4-NP detection in different water environments.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yun Ji,Zhelin Song,Yu Xu,Yanlin Zhang
In this work, typical refractory pollutant Rhodamine B (RhB) was effectively degraded by Cu-Fe LDHs/Bi 2 WO 6 composite in the photo-Fenton process. The hydrothermal synthesis of Cu-Fe LDHs/Bi 2 WO 6 composite with ethylene glycol as reductant created the multivalent coexistence of the same metal element to achieve a self-circle redox reaction between metals. The photo-Fenton process by Cu-Fe LDHs/Bi 2 WO 6 incredibly eliminated the limitation of strong acidic pH value applied in the Fenton process. ∙OH generated by Cu-Fe LDHs/Bi 2 WO 6 was 5 times that of Cu-Fe LDHs during the photo-Fenton process. The complete degradation of RhB in the photo-Fenton process under the optimal conditions of initial pH= 6, 5 mmol/L of H 2 O 2 , and 1 g/L of Cu-Fe LDHs/Bi 2 WO 6 dosage was far more than 46% of RhB degradation in the photocatalytic process and 76% of RhB degradation in the Fenton process. Cu-Fe LDHs/Bi 2 WO 6 composite exhibited the excellent redox ability, electron transfer ability and reusability during the photo-Fenton process. The acceleration of Fe 3+ /Fe 2+ cycles in the Cu-Fe LDHs/Bi 2 WO 6 /H 2 O 2 /Vis system was mainly ascribable to the combination of efficient transfer of photogenerated electrons and self-circle redox of Fe 3+ /Cu + . It is expected for the promising application of multivalent bimetallic photo-Fenton catalysts and rendering enlightenments for photo-Fenton catalytic oxidation reaction.
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NEW CARBON MATERIALS
·
2020
·
IF 1.761
Chi Song,Lin-jie Wang,Si-miao Sun,Ying Wu,Li-jie XU,Lu Gan
A series of ternary composite photocatalysts of Bi 2 O 3 /Bi embedded in porous carbon (Bi 2 O 3 /Bi/PC) was prepared by the high-temperature pyrolysis of a bismuth-based metal organic framework (CAU-17(Bi)). They were used as photocatalysts for the degradation of organic Rhodamine B dye (RhB) in water under visible light. Results showed that the Bi 2 O 3 /Bi/PC composites with different Bi 2 O 3 /Bi ratios could be obtained through changing the extent of the carbothermal reduction of Bi 2 O 3 during pyrolysis. The photocatalystpyrolyzed at 800 o C showed the highest photocatalytic performance and had a wide applicable pH value range and excellent recyclability and stability.The components in the ternary composites exhibited a synergetic effect in the removal of RhB, where Bi 2 O 3 acted as a low-band gap semiconductor, metallic Bi transferred electrons generated by visible light excitation to the graphitic structure in porous carbon to inhibit the recombination of electrons with holes. The holes and peroxide radicals were the main active species. This study provides a new way for the design and preparation of visible-light active and high-performance photocatalysts for organic contaminant degradation in aqueous media by using metal organic frameworks as a multicomponent precursor.
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Materials Today Chemistry
·
2023
·
IF 7.3
J. Ma,B. Zhao,N. Shao,P. Jiang,H. Yang,B. Li
Photocatalysis is considered a promising strategy for environmental remediation, and the preparation of an efficient, stable, and green photocatalyst is a current urgent need. In this work, a magnetically recoverable SnFe 2 O 4 /Bi 2 WO 6 (SFO/BWO) Z-scheme heterojunction was successfully prepared by a simple one-step hydrothermal process. The prepared 7.5%SFO/BWO nanocomposite exhibited excellent photocatalytic performance, with a degradation efficiency of 96.12% for Rhodamine B (RhB) within 120 min, which were respectively 1.64 and 2.07 times greater than that of pure Bi 2 WO 6 (BWO) and SnFe 2 O 4 (SFO). This obvious improvement in the photocatalytic performance benefited from the increase in the separation efficiency of photogenerated carriers and was based on the construction of Z-scheme heterojunction. Additionally, the radical capture tests demonstrated the main reactive radicals were electron (e − ), hole (h + ), and hydroxy radical (•OH) in the photodegradation system. Furthermore, the composite retains excellent photocatalytic performance after five cycles and is easily recoverable due to its magnetic behavior. Notably, during the toxicity assessment, it was proved that SnFe 2 O 4 /Bi 2 WO 6 could be used to eliminate the toxicities of dyes and antibiotics rapidly. Consequently, SnFe 2 O 4 /Bi 2 WO 6 is a promising and competitive photocatalyst in wastewater remediation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Linjuan Pei,Xianmo Gu,Yantao Zhang,Jie Wang,Hao Tan,Pengfei Wang,Zhanfeng Zheng
To improve the photocatalytic performance of TiO 2 and make it easier to recycle, the titanosilicate@anatase core-shell micro-nanostructure photocatalysts were designed. The titanosilicate@anatase core-shell micro-nanostructure was fabricated by a two-step method: an acid-assisted hydrothermal treatment of the hydrogen-form natisite and a subsequent calcination . In the first step, the dissolution and recrystallization of Ti species led to the formation of TiO 2 shell over the titanosilicate; in the second step, the calcination not only facilitated the formation of Ti−O−Si bond, but also improved the crystallization of TiO 2 shell. The rutile TiO 2 was not detected even at 900 °C, which could be attributed to the strong interaction between TiO 2 nanocrystals and the titanosilicate core through Ti−O−Si bond at the interface. The formation of Ti−O−Si bond also changed the surface characteristic of the TiO 2 shell, which facilitated the enrichment of RhB dye molecules around the catalyst and induced the fast production of the O 2 •− . The collaboration of the core and the shell contributed to the quick degradation of RhB under visible light and the excellent recycling performance. The growth kinetics of the core-shell micro-nanostructure has been studied in detail, which provided a novel and facile synthesis strategy for the fabrication of TiO 2 micro-nanostructure easy to be recycled.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Yuye Li,Tianao Liu,Tingting Du,Congzhi Hu,Youyong Pang,Yongping Liu,Botian Liu,Ling Li,Huidan Lu,Bin Huang
Dyes and antibiotics possess high stability and are resistant to microbial degradation, leading to their persistence in the natural environment. Photocatalysis is an effective and green degradation method. In this work, a novel Ag/AgCl/NH 2 -MIL-53(Fe) (AAF) heterojunction photocatalyst was prepared using a solvothermal method, precipitation method, and photochemical reduction method, which effectively promotes the separation of photogenerated charge carriers. The study shows that the composite consisting of 95 wt% Ag/AgCl/NH 2 -MIL-53(Fe) (AAF-95) can photocatalytically degrade 99.4% of RhB within 15 min and 82.4% of TC within 12 min, achieving higher photocatalytic degradation activity than the individual materials. The main active species involved in the degradation are h + and •O 2 - . Based on Mott-Schottky tests, radical trapping experiments, and UV-vis DRS, a possible photocatalytic degradation mechanism and the advantages are proposed: AAF-95 broadens the light absorption range, and the NH 2 -MIL-53(Fe) increases the specific surface area, thereby enhancing the catalytic reaction activity. The coupling between the heterojunction and the SPR effect promotes the separation of photogenerated charge carriers and lowers the catalytic reaction barrier. These are the reasons for the enhanced photocatalytic degradation capability of the composite.
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高影响因子
MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 5
·352
·
IF 5.4
Zhang Yanmei,Jiang Rui,Yang Hongze,Zhou Cheng,Sun Mengxi,Chen Hong,Lin Donghai,Huang Liming,Chen Guosong
A near-infrared (NIR)-excitable ratiometric fluorescent nanosensor, CS-UCNP@mSiO 2 –RBPA, was developed for the selective and sensitive detection of Hg 2+ . The nanosensor is constructed by grafting a rhodamine B-derived probe (RBPA) onto mesoporous silica-coated core–shell NaYF 4 :Yb,Er upconversion nanoparticles (UCNPs). Upon 980 nm excitation, the UCNPs exhibit characteristic green emission at ~ 543 nm and red emission at ~ 655 nm. In the presence of Hg 2+ , the spirolactam ring of RBPA opens specifically, producing a yellow-emitting species that enables efficient Förster resonance energy transfer (FRET) from the UCNP donor. This leads to a Hg 2+ concentration-dependent quenching of green emission and a synchronous enhancement of yellow fluorescence at ~ 584 nm, with the red emission acting as a stable internal reference. The nanosensor shows outstanding selectivity toward Hg 2+ against other competing metal ions and performs optimally at neutral pH. It presents a good linear response in the Hg 2+ concentration range 0–70 µM via UV–vis absorption, and achieves an ultra-low detection limit of 14 nM based on the ratiometric fluorescence signal (I 584 /I 655 ). Benefiting from NIR excitation, ratiometric self-calibration and excellent specificity, this fluorescent nanoplatform holds great potential for practical applications in environmental monitoring and biological analysis.
Section
Graphical
The alternative text for this image may have been generated using AI.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Jiangru Wang,Qirui Shen,Xifeng Yu,Qi Kang,Dazhong Shen
Multi-signal assays offer the advantage to improve the accuracy and diversity by integrating the merits of each output. In the widely used colorimetric and fluorometric dual-mode, the fluorescent intensity and absorbance signals are usually measured by a lab spectrofluorometer and a spectrophotometer. Herein, a smartphone-based device which is able to measure simultaneously the ratiometric fluorescence and absorbance signals was designed. Its analytical performance is demonstrated by the determination of Rhodamine B (Rh B). In a three-channel cuvette, the detection cell (with test solution) was sandwiched between two light intensity measurement cells (with Rh B standard solution). Under the irradiation of the excitation light of 550 nm, the fluorescent images of the three cells were captured by the camera in a smartphone. The ratiometric fluorescence at 590 nm and the absorbance at 550 nm are obtained according to the brightness ratio of the middle cell and the third cell to the first one, respectively. The dual-mode of fluorescence and absorbance can widen the detection range, with the limit of detection for Rh B of 3.2 nM in ratiometric fluorescence mode and 0.38 μM in absorbance outputs, respectively. Importantly, the possible inner filter effect at the excitation wavelength of the fluorescence can be corrected according to the absorbance signal, improving the accuracy of determination. The dual-mode portable device was used to determine Rh B in combination with differential molecularly imprinting strategy to improve further the anti-interference ability.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yan Wu,Ling-Hui Kong,Rong-Fang Shen,Xiao-Jing Guo,Wen-Ting Ge,Wen-Jie Zhang,Zhen-Yue Dong,Xi Yan,Yan Chen,Wan-Zhong Lang
Herein, highly dispersed Fe species supported on activated carbon (CA-Fe-C) was fabricated with the aid of citric acid , showing excellent catalytic performance and stability for the degradation of rhodamine B (RhB) through peroxymonosulfate (PMS) activation. The radical quenching study, electron paramagnetic resonance (EPR) measurement and PMS consumption analysis confirmed the RhB degradation mechanism involving reactive radical species attacking RhB and non-radical oxidation pathway. The main degradation intermediates were identified by LC-MS, and the possible RhB degradation pathways were deduced. A multivariate quadratic polynomial model was developed using the response surface methodology (RSM) to examine how the removal of RhB was influenced by several quantifiable factors, with the objective of optimizing RhB removal. The analysis of variance (ANOVA) was used to evaluate the adequacy and significance of the proposed model. The effects of solution pH values, initial concentration, inorganic anions, PMS dosage, catalyst dosage, and metal loading amount on RhB removal were investigated. The method of initial rates was employed to determine the intrinsic reaction rate law, and the reaction was identified to follow the Langmuir-Hinshelwood (L-H) kinetics model.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·46332-46339
·
IF 3.708
TongMou Geng,RongYi Huang,DaYu Wu
A new monomeric fluorophore N-acryl-N′′-(rhodamine B-yl) diethylenetriamine (ARBD) was synthesized. Free radical precipitation copolymerization was carried out in order to prepare a water-soluble fluorescent copolymer (poly(AM–ARBD)), based on acrylamide. The chemical constitution of poly(AM–ARBD) was studied by FTIR and 1H NMR spectroscopy. The fluorescent characteristic of the aqueous solutions of the copolymer was investigated both in varied pH and in the presence of metal cations. It was found that polymeric sensors exhibited high selectivity and sensitivity in colorimetric and fluorescence responses toward Fe3+ and Cr3+ over other metal ions. The polymeric sensors were non-fluorescent in the spirolactam form and could be selectively converted into the fluorescent ring-opened amide form in the presence of Fe3+ or Cr3+ ions that lead to fluorescence enhancements and colorimetric changes from colorless to red or pink, respectively. Fe3+ and Cr3+ can be sensed with a detection limit at 1.34 × 10−4 and 9.90 × 10−6 mol L−1, respectively. The combination of water solubility and positive fluorescence response as well as color change is therefore particularly promising for the practical utility of this sensor.
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