ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Hong Dai,Lingshan Gong,Guifang Xu,Shupei Zhang,Shuanyan Lu,Yuwei Jiang,Yanyu Lin,Longhua Guo,Guonan Chen
A simple and sensitive electrochemical sensor which was constructed with alkoxy silane and carbon nanohorns was first utilized to detect some food borne contaminants, including malachite green, sudans, triclosan, bisphenol A. Due to the large surface area, good conductivity, admirable electrochemical activity of carbon nanohorns and excellent immobility of alkoxy silane, the synergistic effect root from the easily controlled composition of organic–inorganic hybrid film was achieved. The present work demonstrated this functional film brings advantageous features such as stable and strong adherence to electrode matrix and excellent electrochemical catalysis, to electrochemical sensor to achieve advanced application. By choosing triclosan and malachite green as object, their kinetic parameters on this modified electrode were calculated and the relative quantitive protocols were established. Compared with previous reports, the designed sensor presented lower detection limit, higher sensitivity and more broad linear range. This electrochemical platform offered a useful tool for the on-site determination of food born contamination.
研究领域:
分析化学
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食品安全
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纳米技术
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产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 10
·1041-1052
·
IF 1.899
Cheng Zenghui,Wang Chunpeng,Yu Juan,Liu Meihong,Wang Jifu,Zhang Daihui,Chu Fuxiang
Abstract The utilization of rosin to fabricate functional polymers has attracted great attention due to its unique structure and property. Herein, we prepared a new type of carboxyl-containing cross-linked rosin microspheres (CCRMs) using a renewable-resource rosin as the raw material through the suspension polymerization. For comparative purpose, vanillin methacrylate (VMA), styrene (St) and isobornyl methacrylate (IBOMA) were separately used to replace DAGMA as monomer for the preparation of microspheres. Our results indicated that the obtained porous CCRMs showed a broad size distribution ranging from mesopores (3–50 nm) to macropores (> 50 nm), whereas the counterparts derived from VMA, St or IBOMA showed a powder state. Moreover, the CCRMs exhibited moderately high thermal stability. The integration of DAGMA into polymer microspheres provided CCRMs with excellent adsorption ability, which exhibited robust selective cationic dye (e.g., methylene blue (MB) and crystal violet (CV)) adsorption from waste aqueous solution. The adsorption process was fitted well with the Langmuir isotherm and the pseudo-second-order kinetic model. The maximum adsorption capacity was observed to be 602.4 mg/g for CV at 40 °C, and 512.8 mg/g for MB at 20 °C. In general, the high dye adsorption properties suggest that CCRMs may be highly efficient in adsorption selectivity for some cationic dyes. Graphic abstract
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 6
·1472-1481
·
IF 3.117
Chun-Xiao Li,Ru-Ting Huang,Xian-Yang Shi
Cu7S4/reduced graphene oxide (rGO) photocatalysts are attracting increasing interest because of their low cost and environmental friendliness. In this study, Cu7S4/rGO nanocomposites with high visible-light photocatalytic activity were successfully synthesized via biological and chemical methods. The prepared Cu7S4/rGO nanocomposites exhibited exceptional photocatalytic activity for methyl green (MG) reduction. In particular, the nanocomposites photocatalyst with A-N (biosynthesis with Na2S as the sulfur source) provided the best photocatalytic performance, and could degrade 98.3% MG within 100 min. Their photocatalytic activity sequence is in the following order: A-N (98.3%) > A-U (biosynthesis with CuSO4 as the copper source) (97.8%) > A-C (biosynthesis with CH4N2S as the sulfur source) (97.7%) > A-180 (96.7%) (chemical synthesis at 180 °C in a steel autoclave) > Cu7S4 (69.8%). After five repeated tests, the photocatalyst used in this study showed excellent stability. The photocatalytic activity enhancement can be attributed to Cu7S4 combined with rGO, which can enhance the active center and increase electron transfer. This study provides a novel method for the preparation of a photocatalyst that can quickly and effectively solve dye pollution, and reduce other pollutants. Additionally, the photocatalyst is expected to be used in the fields of photocatalysis, water decomposition and solar cells.
研究领域:
环境科学
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材料科学
·
微生物学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 28
·e00259
·
IF 2
Bo Yang,Hai Xing,Yang Xia,Xin Wang,Ningning Liu
Graphical ZIF-8 was synthesized through an in-situ growth method within a PVDF membrane matrix. The PVDF/ZIF-8 composite membrane was subsequently prepared via the phase inversion method using immersion precipitation. The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The widespread use of organic dyes in industrial processes has led to increasing environmental pollution due to the discharge of dye-contaminated wastewater, necessitating more efficient dye removal methods. In this study, a poly(vinylidene fluoride) (PVDF)/ZIF-8 composite membrane was fabricated via a phase inversion method using immersion precipitation, with ZIF-8 synthesized via in-situ growth within the membrane matrix. The composite membranes were thoroughly characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The adsorption performance of the PVDF/ZIF-8 composite membrane was evaluated for methyl green (MG) removal. At 313 K with an adsorbent dose of 10 mg, the membrane exhibited an adsorption capacity of 172.30 mg g⁻¹ and a removal ratio of 87.21%, demonstrating that the incorporation of ZIF-8 significantly enhanced adsorption performance. Adsorption isotherm studies revealed that the process followed the Freundlich model, while kinetic analysis indicated a pseudo-second-order mechanism. Additionally, thermodynamic investigations suggested that the adsorption was endothermic and spontaneous. The major driving force for adsorption was identified as electrostatic interactions between the dye and the membrane. These findings highlight the potential of PVDF/ZIF-8 composite membranes for effective dye removal from wastewater.
研究领域:
环境科学
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材料工程
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Wenjie Ma,Qin Jiang,Ping Yu,Lifen Yang,Lanqun Mao
This study demonstrates the first exploitation of zeolitic imidazolate frameworks (ZIFs) as the matrix for constructing integrated dehydrogenase-based electrochemical biosensors for in vivo measurement of neurochemicals, such as glucose. In this study, we find that ZIFs are able to serve as a matrix for coimmobilizing electrocatalysts (i.e., methylene green, MG) and dehydrogenases (i.e., glucose dehydrogenase, GDH) onto the electrode surface and an integrated electrochemical biosensor is readily formed. We synthesize a series of ZIFs, including ZIF-7, ZIF-8, ZIF-67, ZIF-68, and ZIF-70 with different pore sizes, surface areas, and functional groups. The adsorption capabilities toward MG and GDH of these ZIFs are systematically studied with UV–vis spectroscopy, confocal laser scanning microscopy, and Fourier transfer-infrared spectroscopy. Among all the ZIFs demonstrated here, ZIF-70 shows excellent adsorption capacities toward both MG and GDH and is thus employed as the matrix for our glucose biosensor. To construct the biosensor, we first drop-coat a MG/ZIF-70 composite onto a glassy carbon electrode and then coat GDH onto the MG/ZIF-70 composite. In a continuous-flow system, the as-prepared ZIF-based biosensor is very sensitive to glucose with a linear range of 0.1–2 mM. Moreover, the ZIF-based biosensor is more highly selective on glucose than on other endogenous electroactive species in the cerebral system. In the end, we demonstrate that our biosensor is capable of monitoring dialysate glucose collected from the brain of guinea pigs selectively and in a near real-time pattern.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 12
·1-9
·
IF 1.604
Lin Shuang,Lin Xiang,Zhao Haiyan,Hasi Wuliji,Wang Li
Quantitative analysis always encounters difficulty in the field of surface-enhanced Raman spectroscopy (SERS) because of the lack of accurate and reliable analytical means. In this work, a new approach was demonstrated for the quantitative SERS measurement by self-assembled superlattice based on ultra-smooth Au nanospheres (NSs) embedded with 4-methylthiobenzoic acid (4-MBA) as the internal reference. Malachite green (MG) in water and chrysoidine in drinks with detection limit of 0.35 µM were successfully and quantitatively measured by employing Au@4-MBA@Au NSs superlattice as solid SERS substrate. Compared with conventional SERS methods, the fitting linearity of the relative SERS intensity vs. analyte concentrations has significantly improved by this new analysis means. As a result, our approach is a reliable analytical strategy to solve quantitative problems in SERS analysis, which can be easily applied for on-site detection and for preliminary monitoring of food samples.
研究领域:
分析化学
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纳米科学与技术
·
食品安全检测
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Cheng-Ye Zhu,Jia-Hui Xin,Chao Zhang,Hao-Cheng Yang,Hong-Qing Liang,Zhi-Kang Xu
Nanofiltration membranes integrating superior separation performance with robust operational stability are imperative for some harsh scenarios such high temperature and acid environment. Nevertheless, the simultaneous attainment of these two attributes remains a formidable challenge for benchmark polyamide nanofiltration membranes due to their unstable molecular structure under these scenarios. Herein, we report a kind of polyurea nanofiltration membranes with twisted and rigid skeleton, enabling exceptional dye/salt separation performance and remarkable resistance to strong acid and elevated temperature. The key to this comprehensive performance lies in employing tetrakis(4-aminophenyl)methane as the amine monomer. Its moderate reactivity and twisted geometry jointly facilitate the formation of a suitably loose polymer network by slowing polymerization and preventing dense chain packing, while the rigid aromatic structure confers enhanced robustness through a durable polymer backbone. Our polyurea membranes demonstrate rejections exceeding 96.7 % for six dyes with molecular weights above 586 Da, while maintaining low rejections below 20.0 % for four representative inorganic salts. The optimized membranes exhibit an impressive Congo Red/Na 2 SO 4 selectivity of 121.9 with a high water permeance of 22.3 L m −2 h −1 bar −1 , outperforming the commercial nanofiltration membrane NF270. Furthermore, the membranes retain stable separation performance even under 80 °C or after exposure to 20 wt% H 2 SO 4 for 30 days, which is attributed to their rigid aromatic backbone and chemically stable urea linkages. This advancement adds a novel dimension for exploiting highly selective and durable nanofiltration membranes suited for demanding separation processes.
研究领域:
材料科学
·
膜分离技术
·
高分子化学
·
纳米技术
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qing Tian,Haoyu Wang,Shuaiqi Huangfu,Rong Yang,Yao Chen,Jie Gao,Yingchun Yang,Lianbing Zhang
Although manganese dioxide (MnO2) has been explored as a powerful laccase nanozyme for pollutant oxidation in wastewater treatment, the phase-activity relationship of multiphase MnO2 remains ambiguous and controversial. Herein, the experimental studies show that the laccase-like activities and aerobic catalytic oxidation toward tetracycline antibiotics of the six types of MnO2 are in the following order: β- > λ- > γ- > α- > ε- > δ-MnO2. Density functional theory (DFT) calculations revealed that the catalytic activities are inversely proportional to the oxygen vacancy formation energies of the different MnO2 materials. Further investigation of surface oxygen species with reactivity demonstrated that rich oxygen vacancies boost the oxygen mobility and catalytic efficiency of MnO2 nanozymes, which is in good agreement with both experimental and DFT results. Hence, this study reveals the decisive role of the crystal phase in the oxygen vacancy generation, which elucidates the laccase-like catalytic mechanism of MnO2 nanozymes and is valuable for the future design and synthesis of MnO2 nanocatalysts.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Man-Tong Zhao,Zhong-Yuan Liu,Ao Li,Guan-Hua Zhao,Hong-Kai Xie,Da-Yong Zhou,Tong Wang
The antioxidant efficiency of gallic acid (GA) and its alkyl esters including methyl gallate (MG), ethyl gallate (EG), propyl gallate (PG), butyl gallate (BG), octyl gallate (OG), lauryl gallate (LG), hexadecyl gallate (HG), and octadecyl gallate (SG) in oyster tissue during hot-air drying process was investigated. Results indicated that GA and its alkyl esters all could effectively retard lipid oxidation in oyster tissue according to peroxide value (POV), thiobarbituric acid reactive substances (TBARS) and free radical intensity. The antioxidant effects increased with the alkyl chain length until OG, thereafter, it gradually decreased. The POV of the OG treated oysters post 10 h of drying was 66.26, 68.90, 77.86, 92.61, 89.45, 70.79, 68.96 and 62.70%, respectively, of those treated by GA, MG, EG, PG, BG, LG, HG and SG. The corresponding values for TBARS were 68.72, 76.59, 77.88, 84.32, 86.23, 68.31, 81.24, 77.36%, while 41.19, 58.62, 62.83, 64.49, 69.60, 61.44, 60.05 and 72.61% for free radical intensity. Pearson correlation analysis showed a positive correlation between the antioxidant effects and the concentrations of the polyphenol compounds in oyster tissue. This report will provide the basic data for selection of suitable antioxidants to improve the oxidation stability of seafood during thermal processing.
研究领域:
食品科学
·
化学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Yue Zhang,Kongyin Zhao,Zhijian Zhang,Huike Xie,Ziyi Li,Ze Lin,Chen Mo,Wendong Yang,Xiaolei Wang,Junfu Wei
Calcium alginate hydrogel is an eco-friendly material, but its wide application as a self-supporting filtration membrane is severely limited by the weak mechanical properties, which makes it difficult for the large scale preparation and the fixation of the membrane in filtration equipment. In this work, a fiber-reinforced calcium alginate membrane (CaAlg-PP) was prepared by coating calcium alginate (CaAlg) hydrogel on the polypropylene (PP) non-woven fabric treated with ethanol/water (v:v = 1:1) solution. The CaAlg-PP filtration membrane was characterized and used for dye/salt separation under a series of operating conditions. The membrane exhibited the co-operativity of the porous support layer and the CaAlg hydrogel in the compositing process, and also exhibited good pressure resistance, pollution resistance and low anionic dye adsorption efficiency. The optimized CaAlg-PP membrane had a high permeance (e.g. 20.3 L·m −2 ·h −1 for methyl blue at 0.1 MPa) and high dye rejection (e.g. methyl blue 99.5%), while low salt rejection (e.g. NaCl 7.5%), and the selectivity of methyl blue/NaCl was up to 185. The CaAlg-PP membranes made with simple processes and low-cost materials may provide new strategies for environmentally-friendly and economical low salts-containing wastewater treatment and dye recycling.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yi Yang,Jing Meng,Haoquan Li,Dongyu Gu,Shuai Wang,Shuai He,Haiyu Xu,Yoichiro Ito
In the present study, high-speed counter-current chromatography with a three-phase solvent system composed of n -hexane-acetonitrile-400 mM ammonium sulfate (1:1:1, v/v) was developed to recover four mixed dyes (methyl green, acridine orange, Congo red and oil red O) with diverse polarities. As a result, four dyes were successfully separated in a single HSCCC run using a step-wise gradient elution. Then, elution-extrusion and back-extrusion counter-current chromatography were used to reduce the separation time and solvent consumption. Among them back-extrusion CCC can save more time. Thus, the present study provides an effective method for dye recycling.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Linlin Xu,Hua Zhang,Yue Tian,Anxin Jiao,Shuang Li,Yang Tan,Ming Chen,Feng Chen
The integration of highly-purity, dense and monodisperse plasmonic nanoparticles (NPs) on two-dimensional (2D) graphene-like support possesses great potential for optimizing surface-enhanced Raman spectroscopy (SERS). Based on ultraviolet (UV) laser-induced modified photochemical reaction , we report an ingenious and green strategy to support highly dispersed Au NPs with controllable distribution on graphene oxide (GO). Without using any stabilizing agents or other complex chemical additives , the GO with abundant oxygen-containing functional groups can be effectively excited by 375 nm laser irradiation in HAuCl 4 solution, resulting in controlled reduction of Au ions and then overgrowth of highly-purity Au NPs. Highly dense and monodisperse Au NPs with uniform diameter of ~20 nm formed on GO supports can be achieved by 30 min irradiation, which can offer maximized SERS activity in comparison with GO/Au NPs obtained by other irradiation times. The optimized GO/Au NPs give rise to ultralow SERS analyses of (10 −14 M) methylene blue (MB), (10 −13 M) rhodamine 6G (R6G) and (10 −13 M) malachite green (MG), respectively. More importantly, it can also simultaneously analyze these three aromatic dyes in a mixture condition at detection limits as low as nano-mole level (10 −9 –10 −11 M), achieving the urgent requirement of mutually independent SERS trace detection. Therefore, the obtained GO/Au NPs with extremely high SERS activity and superior spectroscopic identification will be a prominent candidate for widespread SERS applications in real-word scenarios.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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