APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Xiaozhen Zhang,Han Yu,Yanhua Song,Jingyao Li,Fangke Wang,Ruyan Xie,Shuzhe Zhang,Haifeng Zou
Organic contaminants in the water environment and liquid foods have posed a great threat to the environment as well as human well-being, and the low catalytic activity of traditional TiO 2 photocatalysts limits its further application. Here, inspired by nature, a novel hydrogenated rambutan-like hollow TiO 2 (denoted as HRT) was synthesized by facile hydrothermal treatment and in-situ hydrogenation reduction steps. The protruding spikes on the surface of the 3D rambutan-like hollow structure build a fast channel for charge transfer, the suitable cavity enhances light scattering and collection. The available inner/outer surface can bind contaminants more rapidly which facilitates transportation of photo-generated electrons. Relying on its special structure and abundant surface defects, HRT exhibits excellent photocatalytic degradation property. Under visible light irradiation, the photodegradation rate of rhodamine B (RhB) by HRT nearly reached 100.0%, and 80.0% for tetracycline (TC) within only 10 min, whose photocatalytic activity was 6.45 and 2.08 times higher than that of RT, respectively. Moreover, the innovative and practical application of HRT to the degradation of TC in milk revealed favorable degradation efficiency (71.0%) and salient catalytic reusability after five cycles. This work provides a new perspective on the purification of multiple organic contaminants in aqueous systems, points the way to the intractable problem of removing antibiotics from liquid foods and expands the application fields of semiconductor photocatalysts.
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FOOD CHEMISTRY
·
2021
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IF 7.514
Yingying Sun,Wan Li,Liqing Zhao,Fengyong Li,Yunfei Xie,Weirong Yao,Wenqiu Liu,Zhaosheng Lin
In food safety assessment, surface-enhanced Raman spectroscopy (SERS) is a novel detection method with the advantages of being fast, easy, and of high sensitivity. However, many SERS substrate synthesis methods are complex, and there are only a few studies on the simultaneous detection of multiple substances. In this study, a new, simple, low-cost SERS substrate was synthesised for the first time to simultaneously detect illegal food additives rhodamine B and basic orange II in chilli products. A lightweight, porous, and low-cost material of melamine foam (MF) was employed as the SERS synthesis template. The substrate’s SERS effect on, and sensitivity to, rhodamine B and basic orange II were demonstrated. The molecular vibration and SERS enhancement mechanisms of the two target molecules were analysed by density functional theory (DFT) calculations. The results reveal that this fabricated substrate has great application potential for the supervision and testing industry.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Peng Liu,Dengjie Zhong,Yunlan Xu,Nianbing Zhong,Guangjun He
Co/Fe co-doped porous graphite carbon (Co/Fe-PGC) nanocomposites were successfully prepared by one-step pyrolysis with CoFe-MOF, in which the Co/Fe nanoparticles were uniformly coated on porous graphite carbon derived from MOF. It was used to microelectrolysis-Fenton degrade rhodamine B through the main active substance ∙OH. The color and TOC removal rate of 100 mg/L rhodamine B reached 99.41% and 64.6%, respectively, for 30 min. Rhodamine B was degraded into small molecular organic acids, alcohols and lipids by N-demethylation and chromophore cleavage, until it was finally degraded into CO 2 and H 2 O, and no new colored organics were produced in the degradation process. The degradation process follows the first-order reaction kinetics, and its rate constant is much higher than that of the previous similar studies. The excellent catalytic performance of Co/Fe-PGC catalyst is attributed to the coupling effect of micro-electrolysis and Fenton reaction, and the acceleration of cobalt on electron transport and Fe 2+ reduction. Co 0 /Fe 0 undergoes galvanic corrosion to generate Co 2+ /Fe 2+ and H 2 O 2 , and then these products undergo Fenton reaction to generate Co 3+ /Fe 3+ and ∙OH, thus forming a circulating system of Co 3+ /Fe 3+ and Co 2+ /Fe 2+ , enhancing the activation of H 2 O 2 and ensuring the efficient degradation of RhB.
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Environmental Progress & Sustainable Energy
·
2021
·Vol. 41
·期 1
·e13714
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IF 2.431
Xiaowei Wang,Junkai Zhang,Fengmin Wu,Junqing Cai,Jie Luo,Erpeng Zhou,Yongping Niu
Graphitic carbon nitride (g-C 3 N 4 ) is a fascinating nonmetallic photocatalyst for the removal of environmental pollutants. The fumed silica/g-C 3 N 4 (gCN-FS) composite photocatalysts were successfully fabricated by a combination of solvent volatilization and post-annealing methods. The introduction of SiO 2 not only widens the absorption range of visible light, but also enhances the specific surface area of g-C 3 N 4 . The gCN-FS-3 composite has a BET surface area of 129.89 m 2 /g, which is ~3.3 times as much as that of g-C 3 N 4 (39.54 m 2 /g). The gCN-FS composites have markedly improved rhodamine B (RhB) photodegradation activity in comparison to pure g-C 3 N 4 , bulk g-C 3 N 4 and P25 under 557 nm yellow-green light emitting diode light irradiation. The gCN-FS-3 has the highest RhB photodegradation rate, which is ~9.67-, 11.81-folds as compared to bare g-C 3 N 4 and bulk g-C 3 N 4 , respectively. The coupling effect between the increase in specific surface areas and the inhibition effect of SiO 2 on photogenerated electron/hole pairs recombination is responsible for the enhanced visible light photocatalytic activity of gCN-FS composite. Superoxide and holes are responsible for the RhB photocatalytic degradation. Furthermore, no apparent loss of photocatalytic activity over five cycles is observed, which indicates that the gCN-FS composites have considerable stability and reusability in the photodegradation process. The gCN-FS composites show great promise in visible light driven photocatalysis for environmental applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Chun Huang,Yulan Wang,Miao Gong,Wei Wang,Yang Mu,Zhen-Hu Hu
The discharging of Rhodamine B (RhB) from wastewater has caused huge environment pollution. Peroxymonosulfate (PMS) oxidation is an effective way to remove it from wastewater. However, finding an environmentally friendly metal to activate PMS is a key step for the oxidation process. In this study, nanorod α-MnO 2 loaded palygorskite (α-MnO 2 /Pal) was fabricated by a simple hydrothermal method. The analysis of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) confirmed the loading of α-MnO 2 on the surface of Pal and characterized the surface of the composite. The surface area of α-MnO 2 /Pal composite was 159.13 m 2 /g, which was much higher than that of Pal and α-MnO 2 . The Pal, α-MnO 2 , Mn 2+ , and α-MnO 2 /Pal were used to activate PMS for RhB degradation. Nearly 100% RhB degradation was obtained in α-MnO 2 /Pal + PMS system in 180 min and in α-MnO 2 + PMS system in 300 min, while only 50% degradation was obtained in Pal + PMS system and 71.4% degradation in Mn 2+ + PMS system in 300 min. The degradation fitted the pseudo-first-order reaction kinetics well with rate constant of 0.02041 min −1 for α-MnO 2 /Pal + PMS system, 0.01192 min −1 for α-MnO 2 + PMS system, and 0.00435 min −1 for Mn 2+ + PMS system, respectively. The factors affecting RhB degradation were further investigated. The RhB degradation efficiency increased with the increase of α-MnO 2 /Pal dosages, PMS dosages and temperatures. The degradation was inhibited at pH > 5.5, while was favorable at pH < 5.5. The major reactive radicals responsible for RhB degradation classified by radical quenching experiment were O 2 − and 1 O 2 . The possible mechanism was further proposed based on the results. The α-MnO 2 /Pal composite showed nearly 50% mineralization ratio in the presence of PMS and an excellent reusability. The results from this study revealed that α-MnO 2 /Pal composite is an effective catalyst to activate PMS for RhB degradation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·14954-14966
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IF 2.195
Fang Hongjun,Pan Yusong,Yin Minyuan,Pan Chengling
Active co-catalysts have been extensively used for improving photocatalytic activity in semiconductor-based photocatalytic systems. Herein, 2D alkalized Ti 3 C 2 (Ti 3 C 2 -OH) nano-sheets were coupled with CdS via a facile electrostatic self-assembly strategy and combined with hydrothermal method to prepare Ti 3 C 2 -OH/CdS photocatalyst. The morphologies, crystal phases, optical and photoelectrical properties of the prepared photocatalysts were characterized by XRD, SEM, TEM, FTIR, PL, and EIS analysis, respectively. The photocatalytic degradation results verified that the photo-degradation performance of Ti 3 C 2 -OH/CdS photocatalyst (degradation of 97% RhB in 100 min) was obviously superior to that of pure CdS (degradation of 70% RhB in 100 min) and Ti 3 C 2 /CdS (degradation of 82% RhB in 100 min). The active species trapping experiments for Ti 3 C 2 -OH/CdS photocatalyst revealed that the superoxide radical ( · O 2 − ) and holes (h + ) were the predominant species for degradation of RhB. Furthermore, the Ti 3 C 2 -OH co-catalyst in the Ti 3 C 2 -OH/CdS composite not only played the role of promoting the effective separation of photo-generated electron–hole pairs, but also constructing strong connections with CdS semiconductor to establish heterostructure, ultimately enhancing the photocatalytic performance of the Ti 3 C 2 -OH/CdS photocatalyst.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
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2018
·Vol. 215
·期 11
·1701061
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IF 1.795
Binrong Li,Jinyu Chu,Yi Li,Minjia Meng,Yanhua Cui,Qidi Li,Yonghai Feng
Photocatalytic degradation is an effective method for fast removal of dye-contaminated water. In the present work, a bismuth oxide/zinc sulfide-cellulose acetate photocatalytic membrane (Bi 2 O 3 /ZnS-CA) is successfully fabricated via the phase-inversion method with a Bi 2 O 3 /ZnS heterojunction as the photocatalyst. The Bi 2 O 3 /ZnS-CA membranes shows high photocatalytic activity in degradation of Rhodamine B (RhB) under visible-light irradiation due to the Bi 2 O 3 /ZnS heterojunction structure contributing to the high efficiency of photogenerated charge separation. The photodegradation efficiency of Bi 2 O 3 /ZnS-CA membrane is significantly enhanced (about 30% improvement) and the photodegradation kinetic is four times faster than that of the Bi 2 O 3 -CA and the ZnS-CA membranes. Moreover, the Bi 2 O 3 /ZnS-CA membrane exhibits excellent permeation flux (649.7 L m −2 h −1 ) and high porosity (69.94%). The Bi 2 O 3 /ZnS-CA membrane also shows good adsorption performance of RhB, which could enhance the interaction between RhB and the catalyst. This work provides a new sight to construct highly effective visible-light-driven photocatalytic membranes for continuous organic dye treatment.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2015
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IF 2.353
Qi Huang,Qingyou Zhang,Enze Wang,Yanmei Zhou,Han Qiao,Lanfang Pang,Fang Yu
In this paper, a new fluorescent probe has been synthesized and applied as “off–on” sensor for the detection of Al 3+ with a high sensitivity and excellent selectivity in aqueous media. The sensor was easily prepared by one step reaction between rhodamine B hydrazide and pyridoxal hydrochloride named RBP. The structure of the sensor has been characterized by nuclear magnetic resonance and electron spray ionization-mass spectrometry. The fluorescence intensity and absorbance for the sensor showed a good linearity with the concentration of Al 3+ in the range of 0–12.5 μM and 8–44 μM, respectively, with detection limits of 0.23 μM and 1.90 μM. The sensor RBP was preliminarily applied to the determination of Al 3+ in water samples from the lake of Henan University and tap water with satisfying results. Moreover, it can be used as a bioimaging reagent for imaging of Al 3+ in living cells.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Nagaraj Basavegowda,Kanchan Mishra,Yong Rok Lee
Novel FeAgPt alloy nanoparticles were biosynthesized via ultra-sonication using the root extract of Platycodon grandiflorum . The nanoparticles exhibited enhanced catalytic activities in the reduction of 4-nitroaniline (4-NA) to p -phenylenediamine with a significantly reduced reaction time and increased rate constant because of their high number of active surface sites. In addition, the same catalyst exhibited enhanced catalytic activity in the decolorization of an environment polluting dye, rhodamine B (RhB). The time taken for the complete conversion of 4-NA to p -phenylenediamine was 25 min with an apparent rate constant of 10.06 × 10 −2 min −1 . Similarly, the catalytic decolorization of RhB took 15 min for complete decolorization of the dye molecules with a rate constant 25.60 × 10 −2 min −1 . The performance difference of mono, bi and trimetallic nanoparticles for both the reduction of 4-NA and decolorization of RhB was also examined. These trimetallic alloy nanostructures with excellent catalytic efficiency can also be used for other applications.
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Water
·
2024
·Vol. 16
·期 17
·2389
·
IF 3
Yuli Chen,Dechong Ma,Guowen He,Sai Pan
In this study, fusiform bismuth (Bi) was synthesized, and its photocatalytic performance, degradation mechanism, and pathways for removing rhodamine B (RhB) at different pH levels were investigated. Additionally, the morphologies, structural characteristics, surface electronic states, optical properties, active species, and potential degradation pathways of RhB over the fusiform Bi were analyzed. The comparison of the results before and after RhB degradation using the fusiform Bi revealed the formation of a Bi/BiOCl heterojunction photocatalyst. At pH 2.0, 3.0, 5.0, 7.0, and 9.0, the heterojunction exhibited excellent photocatalytic activity, with RhB removal efficiencies of ~97%, 96.7%, 72.6%, 53.5%, and 27.6%, respectively. Moreover, total organic carbon and chemical oxygen demand analyses were performed to evaluate the mineralization rates of RhB with the fusiform Bi at pH 3.0 and 7.0. Furthermore, the effects of catalyst content, initial RhB concentration, light source distance, inorganic anions, and reactant temperature on the photocatalytic performance of the fusiform Bi were investigated. Additionally, the types of active species and potential photocatalytic mechanisms for RhB degradation over the fusiform Bi at different pH levels (3.0 and 7.0) were elucidated. The appropriate degradation pathways were identified via liquid chromatography–mass spectrometry at pH 3.0 and 7.0.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Ling Wu,Shuang Qi,Tingwei Zhang,Yongcan Jin,Huining Xiao
In this work, new N, O-codoped chitosan-derived carbon adsorbents (CKC-x, x refer to the calcination temperature) were synthesized over a simple process of chitosan-KOH aerogel production and simultaneous carbonization/activation of the aerogel. CKC-700 was characterized by sheet-like morphology (even containing a portion of carbon nano-sheet of 3 nm thickness), high porosity and specific surface area (1702.1 m 2 /g), and pyridinic/pyrrolic/graphitic N groups. The simultaneous carbonization/activation of chitosan-KOH aerogel prepared by top-down coagulation of chitosan aqueous solution by KOH aqueous solution rendered these beneficial characteristics. CKC-700 exhibited a superior adsorption capacity for Rhodamine B (RhB) to other chitosan-derived carbon adsorbents, and the maximum adsorption capacity for RhB of 594 mg/g was achieved at 55 °C. CKC-700 also possessed reasonable reusability for the removal of RhB, and the removal efficiency was still above 95 % in the fifth cycle. The effects of adsorption temperature and time, adsorbent dose, organic dye concentration, and solution pH on the adsorption capacity of CKC-700 were studied. Moreover, the adsorption isotherm , kinetics, thermodynamics, and the adsorption mechanism of RhB on CKC-700 were discussed. In addition, CKC-700 also showed favorable adsorption performance for methylene blue (441 mg/g), methyl orange (457 mg/g), and congo red (500 mg/g) at around 25 °C.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Yang Liu,Hongguang Guo,Yongli Zhang,Xin Cheng,Peng Zhou,Gucheng Zhang,Jingquan Wang,Peng Tang,Tingling Ke,Wei Li
This study represents the first investigation on the application of persulfate (PS)/vis-light for the degradation of Rhodamine B (RhB) using bismuth oxyiodide magnetic composites (BiOI/Fe 3 O 4 , BOMCs). The 3D flower sphere-like BOMCs were successfully fabricated via a hydrothermal method, proving to be an excellent photocatalyst under visible light when evaluated by various characterization methods. The results demonstrated that BOMCs had a high photodegradation efficiency at pH 3.0–9.0 and the BiOI/Fe 3 O 4 (5:1) composite displayed the optimal catalytic performance. Inorganic ions such as Cl − showed promotion at a lower concentration, while significant inhibition was observed for higher concentrations of Cl − and HCO − 3 in the Vis/BOMCs/PS process due to the quenching effect. Moreover, 44.9% mineralization efficiency for total organic carbon and the excellent stability of BOMCs were demonstrated with limited iron leaching. Based on the scavenger experiments, the photocatalytic mechanism in the coupled system determined· SO − 4 and OH as the main reactive species. Eventually, the major intermediates are detected by GC/MS, and a possible photocatalytic degradation pathway of RhB is proposed in the Vis/BOMCs/PS process.
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