FOOD CHEMISTRY
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2022
·
IF 9.231
Chao-Qun Wan,Yue-Hong Pang,Yong-Wei Feng,Xiao-Fang Shen
Glyphosate, a broad-spectrum and high-efficiency herbicide, could accumulate in the human body through the consumption of agri-food products. Herein, a ratio fluorescence sensor based on rhodamine B-embedded amino-functionalized iron-based metal-organic framework (MOF, NH 2 -MIL-88(Fe)@RhB) bonded with Cu 2+ was developed for rapid detection of glyphosate. The synthesized NH 2 -MIL-88(Fe) was a biconical prism and had a cavity for the embedding of RhB as a reference compound. In the presence of Cu 2+ , Lewis interactions with NH 2 -MIL-88(Fe)@RhB cause the fluorescence signal to be turned off. When glyphosate was added, the signal was turned on due to chelation with Cu 2+ and hydrogen bonding interactions with NH 2 -MIL-88(Fe)@RhB. Under optimal conditions, the developed sensor exhibited a linear range of 0.60–45 μmol L −1 with a response time of less than 1 min. The sensor was applied in the analysis of agri-food products (tea, soybean, wheat, cucumber), with recoveries between 97.93% and 109.06%, indicating its promising application in agri-food safety.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Jixian Ma,Binxia Zhao,Xiaoxiao Fan,Wenjie Wang,Xingliang Chen,Nan Shao,Peiyang Jiang
An efficient Ag/rGO/Bi 2 WO 6 nanocomposite was synthesized by the precipitation-photoreduction method. The resulting Ag/rGO/Bi 2 WO 6 showed excellent photocatalytic activity for the photodegradation of Rhodamine B (RhB), with 15%Ag/rGO/Bi 2 WO 6 photodegrading 96.97% of RhB in 180 min, which was 1.28, 1.09 and 1.05 times higher than that of Bi 2 WO 6 , Ag/rGO, and rGO/Bi 2 WO 6 , respectively. The effect of noble metal Ag's surface plasmon resonance and Schottky barrier , as well as the superior electron transfer ability of rGO , dramatically improved photo-generated electron-hole pair separation and transfer efficiency. In addition, the effects of pollutant concentration, pH, and catalyst dosage on Ag/rGO/Bi 2 WO 6 photocatalytic performance also were explored. Furthermore, the free-radical trapping tests revealed that the primary active radicals in the catalytic system are hole (h + ), superoxide radical (•O 2 − ), and hydroxy radical (•OH). Additionally, after four recycling, the photocatalytic performance of the Ag/rGO/Bi 2 WO 6 composite did not show a significant decline. As a result of this research, the Ag/rGO/Bi 2 WO 6 catalyst, as developed, has a bright potential for environmental purifying.
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Arabian Journal of Chemistry
·
2022
·
IF 6.212
Xinyu Zhang,Tingwei Zhang,Jiaqi Guo,Mehraj Ahmad,Hui Yang,Xiankun Su,Feng Huang,Yongcan Jin,Huining Xiao,Junlong Song
High volatile matter contents in the feedstock could promote the development of porous structures and the reactivity of biochar. Herein, tobacco midrib with high volatile matter contents was used to prepare biochar by a dual-templating approach with mild activators (K 2 C 2 O 4 ·H 2 O, CaCO 3 ). The characterizations of textural properties indicated that tobacco midrib-based biochar possessed numerous meso-, micro-, and macro-pores, specific surface area reached 1841.9 m 2 g −1 . As a dye adsorbent, the adsorption capacity of this biochar towards Rhodamine B reached 588.7 mg g −1 . After recycling 5 times, it still retained over 90% of its initial adsorption capacity. Moreover, thermodynamic parameters assessed with full vańt Hoff equation confirmed that dye molecules replace water molecules connected on biochar surface during the adsorption according to negative heat capacity change (-3.9 kJ mol −1 K −1 ), Δ H 0 (–22.1 kJ mol −1 ) and Δ S 0 (0.3 kJ mol −1 ) revealed that the adsorption process of Rh B by TMB was exothermic and the disorder of the solid–liquid interface increased. Overall, this research provides a mild and effective approach to modifying biochar from special tissue of agriculture waste and an insight into the process of dye adsorption on biochar from thermodynamics.
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Micromachines
·
2023
·Vol. 14
·期 4
·870
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IF 3.4
Huan Wang,Mingxuan Dong,Baorui Shao,Yaodan Chi,Chao Wang,Sa Lv,Ran Duan,Boqi Wu,Xiaotian Yang
N-TiO2/Ni(OH)2nanofiber was successfully prepared by combining the electrospinning and solvothermal method. It has been found that under visible light irradiation, the as-obtained nanofiber exhibits excellent activity for the photodegradation of rhodamine B, and the average degradation rate reaches 3.1%/min−1. Further insight investigations reveal that such a high activity was mainly due to the heterostructure-induced increase in the charge transfer rate and separation efficiency.
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Catalysts
·
2021
·Vol. 11
·期 6
·661
·
IF 4.146
Xi Lin,Yanxia Li
In order to degrade toxic pollutants such as dyes during the process of sewage treatment, considerable attention has been paid to photocatalytic technologies. In this paper, TiO2/Ag[BMIM]Cl (1-butyl-3-methyl imidazolium chloride ([BMIM]Cl)) nanocomposites were prepared with TiO2as the carrier, silver ions as dopants and ionic liquids (IL) as modifiers. The morphologies, microstructures, crystalline structure and optical properties of the TiO2/Ag[BMIM]Cl nanospheres are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), total organic carbon (TOC), and UV-vis diffuse reflectance spectrum (UV-vis DRS) techniques. The TiO2/Ag[BMIM]Cl nanocomposites can selectively degrade rhodamine B (Rh B) under visible light because of the unstable quaternary ammonium salt. The as-obtained nanocomposites exhibit better photocatalytic activity performance than pure TiO2, TiO2/IL, and TiO2/Ag+. The experimental results show that the Rh B degradation rate can reach 98.87% under optimized producing conditions by using the TiO2/Ag[BMIM]Cl composites as the catalyzer. It shows that simultaneous doping with silver ions and ionic liquids can significantly improve the photocatalytic activity of TiO2in Rh B degradation, indicating the formation of photosensitive AgCl in the process of TiO2/Ag[BMIM]Cl preparation. Ag+and IL addition exchange the band gap of TiO2and lengthen the visible wavelength range of the composite. The material has the advantages of low cost, facile preparation and reusability with the excellent degradation effect of Rh B.Keywords:TiO2/Ag[BMIM]Cl composites;rhodamine B;visible photocatalytic degradation
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PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
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2020
·Vol. 16
·期 11
·1727-1734
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IF 2.831
Mercadé-Prieto Ruben,Rodriguez-Rivera Luis,Chen Xiao Dong
Rhodamine B (RhB) is a well known dye extensively used in thermometric studies, either considering the decrease in the fluorescence intensity or the lifetime ( τ ) with temperature. Lifetime measurements are preferred over intensity ones as they are more robust. In order to expand microscopy thermometry to complex food fluids, the effect of solutes on the τ of RhB was studied using fluorescence lifetime imaging microscopy (FLIM) in a two-photon microscope. Polysaccharides of different molecular weights (glucose, lactose, dextran, maltodextrin, and sodium alginate), as well as whey proteins, were considered as typical model food ingredients. A linear increase in τ with the concentration is observed in most polysaccharides, highlighting that it is not due to an increase in the macroscopic viscosity, but in maltodextrins a Langmuir-like concentration dependence is observed. There are extensive interactions between RhB and whey proteins at small concentrations that quickly increase τ up to saturation at >10 wt% proteins, with τ modelled well using an adsorption Langmuir model. Therefore, the effect of solutes on RhB τ is not related to changes in the macroscopic viscosity. The temperature sensitivity of τ , quantified using apparent activation energies, decreases at high solute contents.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·4954-4968
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IF 1.941
Ding Tingting,Xiao Xinyan,Wang Yi,Lu Mingli
A novel 0D/2D Z-scheme AgI/Bi 24 O 31 Br 10 photocatalyst was prepared through the simple solvothermal and coprecipitation method, in which AgI nanoparticles were decorated on the surface of Bi 24 O 31 Br 10 nanosheets. The AgI/Bi 24 O 31 Br 10 composites exhibited improved photocatalytic activity for the degradation of rhodamine B (RhB) in comparison with pristine Bi 24 O 31 Br 10 and AgI under simulated sunlight irradiation. Specifically, AB-30 (mass fraction of AgI, 30%) composite exhibited remarkable photocatalytic activity of 97.6% towards RhB degradation under 120 min of simulated sunlight irradiation, and its RhB degradation rate constant ( k ) was approximately 20.7 and 2.9 times higher than that of pure Bi 24 O 31 Br 10 and AgI, respectively. The improvement of photocatalytic performance of as-prepared AgI/Bi 24 O 31 Br 10 heterojunction composites was ascribed to the synergistic effect of wide visible-light harvest capacity and the rapid transfer and separation efficiency of charge carriers. UV–vis diffuse reflectance spectra (DRS) analysis validated that the introduction of AgI could broaden the visible-light absorption of AgI/Bi 24 O 31 Br 10 composite. The results of electrochemical impedance (EIS), photocurrent response and photoluminescence spectra (PL) tests showed that AgI/Bi 24 O 31 Br 10 composite possessed the efficient separation and migration of photogenerated charge carriers. Trapping experiments of free radicals certified that ·O 2 − was the main reactive species in the process of degradation. And a probable photocatalytic mechanism of Z-scheme heterojunction between Bi 24 O 31 Br 10 and AgI was proposed.
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Materials Today Communications
·
2020
·
IF 2.678
Xueyan Liu,Lingxiao Li,An Chen,Chengyou Kan,Jianhong Xu
A polymerizable rhodamine-based monomer 2-(3-(2-(3′,6′-bis(diethylamino)-3-oxospiro[isoindoline-1,9′-xanthen]-2-yl)ethyl)ureido)ethyl acrylate (RhBUEA) is first designed and synthesized, and then used in the preparation of a new water-soluble P(AM-co-RhBUEA) through precipitation polymerization of it with acrylamide (AM). Influence of the RhBUEA content on the polymerization process is investigated, and the chemical structure and composition of the copolymers are confirmed by FTIR and UV–vis spectral analysis. According to the off-on switch between spirolactam and ring-opened form of rhodamine derivative, P(AM- co -RhBUEA) prepared with 15 wt.% RhBUEA exhibits a highly sensitive and selective recognition towards Fe 3+ in aqueous solution with 0.073 μM of detection limit, accompanied with a remarkable spectral and color change. Furthermore, the spectral response is reversible by the alternating addition of Fe 3+ and EDTA to the copolymer, and the test strips prepared by P(AM-co-RhBUEA) can detect Fe 3+ colorimetrically and portably, which makes the water-soluble polymer a promising Fe 3+ sensor in the field of on-site detection.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 10
·4173-4192
·
IF 2.914
Fu Fengping,He Qian,Zhao Shizheng,Zhu Ting,Liao Fang
The design and fabricate new metal-free photocatalysts is one of the topics in current chemistry. In this paper, we demonstrate the ultrahigh photocatalytic performance of visible light-driven metal-free photocatalyst for selective catalytic reduction of nitro-compounds. The synthesis of 1.5–4.5-nm m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) via simple hydrothermal reaction of Rhodamine B and m-phenylenediamine mixed solution. The obtained PmRDs can be used as visible light-driven metal-free photocatalyst with ultrahigh photocatalytic performance for elective catalytic reduction of nitro-compounds. Due to the hydrogen-bond and specific C–N–N bonding model between the m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) and nitro-compounds, the PmRDs show high photocatalytic activity and selectivity for catalytic reduction of nitro-compounds. Under the irradiation of xenon lamp, 40 ml of 1 mM 4-nitrophenol (4-PN) could be catalyzed by 12 mg catalyst within 5 min, by calculating the rate constants up to 0.766 min −1 (25 °C). In the same way, the PmRDs are also excellent photocatalytic activity and selectivity for different nitro-compounds. Meanwhile, the efficient fast photoinduced electron transfer between the m-phenylenediamine and the Rhodamine B progress significantly improved the photocatalytic performance of PmRDs which is much higher than metal-based (such as: Ag, Ni and Cu) or metallic composite photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yang Zhao,Hui-Long Wang,Hui-Ping Qi,De-Ying Zhao,Xin-Kui Wang
Based on the superior photocatalytic activity of low crystalline BiOCl (LCB) and temperature responsive character of poly( N -isopropylacrylamide) (PNIPAM), the novel BiOCl/GO@PNIPAM photocatalyst (PGOB) was successfully synthesized in this work by employing LCB as a photocatalytic core material, graphene oxide (GO) as a carrier for LCB, and PNIPAM as a thermo-sensitive shell material of the photocatalyst. Compared with the high crystalline BiOCl nanoplates (NPB), the core material LCB in PGOB exhibited superior photocatalytic activity and could be prepared simply by a mannitol complexation-assisted method under ambient conditions without any post-treatment. The interactions between mannitol and bismuth caused changes in chemical environment of bismuth in LCB. The morphology, crystallization, structure features and chemical compositions of the as-prepared samples were investigated by various techniques. The results showed that the prepared PGOB sample exhibited good temperature-responsive performance, excellent adsorption capacity and superior photocatalytic activities, the higher activity of which could be attributed to the effective separation and longer survival of the photogenerated carriers.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yong Zhang,Keding Li,Jun Liao
The multifunctional reduced-graphene-oxide/rare-earth-metal-oxide (RGO/REMO) aerogels with three-dimensional (3D) interconnected networks were fabricated through a facile one-step hydrothermal method and freeze-drying process. It was proved that REMO nanoparticles could be easily deposited on graphene sheets in gentle conditions. To further investigate the effect of REMO on the adsorption of dyes, RGO/Nd 2 O 3 , RGO/Pr 2 O 3 and RGO/Ce 2 O 3 aerogels were used to adsorb the Rhodamine-B (RhB). The RGO/REMO aerogels all exhibited high adsorption capacity for RhB and the maximal adsorption capacity was as high as 243.4 mg·g −1 . In particular, RGO/Ce 2 O 3 aerogel had a significant adsorption efficiency for RhB, and the adsorption capacity of RGO/Ce 2 O 3 aerogel for RhB reached 130.1 mg·g −1 only in one hour. Furthermore, as for RGO/Ce 2 O 3 aerogel, the removal-rate of RhB was still more than 92% after nine repeated regeneration. The excellent adsorption capacity and high repeated utilization rate of RGO/REMO aerogels indicated that the composite adsorbent possessed potential practical application in the treatment of wastewater containing RhB.
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JOURNAL OF AOAC INTERNATIONAL
·
2019
·Vol. 99
·期 3
·760-765
·
IF 1.201
Zhang Jing,Zhang Liu,Wang Wenchang,Chen Zhidong
A sensitive and convenient electrochemical method was developed for the determination of rhodamine B by a silica-pillared zirconium phosphate/nafion composite (SPZP/NAF) modified glassy carbon electrode. The SPZP was characterized with scanning electron microscopy and X-ray diffraction. Because of the layer structure and large specific surface area of SPZP, the SPZP/NAF modified glassy carbon electrode showed high electrocatalytic activity toward the oxidation of rhodamine B. Under optimal experimental conditions, the SPZP/NAF modified electrode exhibited a wide linear response to rhodamine B ranging from 0.01 to 5.0 μM and a low detection limit down to 4.3 nM (S/N = 3). This method showed good accuracy, acceptable precision, and reproducibility. This electrode had been applied in the determination of rhodamine B in preserved fruit and chili powder samples. The proposed method provided a useful tool for the assay of rhodamine B in food samples.
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