DALTON TRANSACTIONS
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2021
·Vol. 50
·期 25
·8927-8937
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IF 4.39
Ying Liu,Na Wang,Zhongqiao Sun,Yide Han,Junli Xu,Yan Xu,Junbiao Wu,Hao Meng,Xia Zhang
MOF/polymer hybrid membranes integrate the surface activity of MOFs and the advantages of PVDF membranes, and can be used as adsorption membranes in the efficient removal of target organics. In this work, a new hybrid membrane of ZIF-67/PVDF with varying ZIF-67 dosages has been fabricated through a facile mechanical blending followed by a lyotropic phase transition. Methods including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), FT-IR analyses and surface hydrophobicity/hydrophilicity measurements are applied to characterize the structure, physicochemical properties and membrane performances. Two synthetic triarylmethane dyes, cationic malachite green (MG) and anionic fuchsin acid (FA), are chosen as the main adsorption targets to evaluate the adsorption capacities of the resulting ZIF-67/PVDF hybrid membranes. Interestingly, all of the ZIF-67/PVDF hybrid membranes exhibit distinctly favorable efficiencies and selectivities toward MG and FA compared to pristine PVDF, which proves the positive roles of ZIF-67 in the adsorption ability of the hybrid membranes. The adsorption conditions are optimized and the adsorption kinetics and thermodynamics are analysed to study the adsorption mechanism. The reusability and the structural stability of the hybrid membranes undergoing cyclic adsorption processes are also discussed. To the best of our knowledge, this is the first time that good adsorption capacities for MG and FA for these MOF/PVDF membranes have been reported. This work highlights the prospective applications of MOF/PVDF hybrid membranes in the rapid and effective removal of target organics in the treatment of waste water.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2021
·
IF 4.556
Peihong Deng,Jinxia Feng,Yanping Wei,Jingyun Xiao,Junhua Li,Quanguo He
An ultrasensitive voltammetric method for fast determination of trace malachite green in aquaculture and fisheries using an acetylene black paste electrode modified with hexadecylpyridinium bromide was established. Compared with the unsatisfactory response at carbon paste electrode, the performance of the modified electrode for the electrooxidation of malachite green was improved significantly. The parameters for quick and sensitive detection of malachite green were optimized, including the type of supporting electrolyte, solution pH, accumulation potential and accumulation time. By using the technique of second derivative linear sweep voltammetry, the peak current was linearly related to malachite green concentration in the wide range of 0.02 μM ∼ 40 μM. After a 150 s preconcentration, a low method detection limit of 4.0 nM was obtained (Signal to noise ratio of 3). In addition, the hexadecylpyridinium bromide modified acetylene black paste electrode exhibited excellent intra-day repeatability (RSD = 2.7 %) and inter-day repeatability (RSD = 3.8 %), good stability and anti-interference ability. Finally, the method was applied to the determination of malachite green in water and fish samples with satisfied relative recoveries of 96.0∼104.0 %, suggesting that this method has good accuracy.
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International Journal of Nanomedicine
·
2020
·
IF 5.115
Yulan Weng,Jiulong Li,Xingcheng Ding,Binqiang Wang,Shang Dai,Yulong Zhou,Renjiang Pang,Ye Zhao,Hong Xu,Bing Tian,Yuejin Hua
Background Biodegradation of toxic organic dye using nanomaterial-based microbial biocatalyst is an ecofriendly and promising technique.Materials and Methods Here, we have investigated the novel properties of functionalized Au-Ag bimetallic nanoparticles using extremophilic Deinococcus radiodurans proteins (Drp-Au-AgNPs) and their degradation efficiency on the toxic triphenylmethane dye malachite green (MG).Results and Discussion The prepared Drp-Au-AgNPs with an average particle size of 149.8 nm were capped by proteins through groups including hydroxyl and amide. Drp-Au-AgNPs demonstrated greater degradation ability (83.68%) of MG than D. radiodurans cells and monometallic AuNPs. The major degradation product was identified as 4-(dimethylamino) benzophenone, which is less toxic than MG. The degradation of MG was mainly attributed to the capping proteins on Drp-Au-AgNPs. The bimetallic NPs could be reused and maintained MG degradation ability (>64%) after 2 cycles.Conclusion These results suggest that the easily prepared Drp-Au-AgNPs have potential applications as novel nanomedicine for MG detoxification, and nanomaterial for biotreatment of a toxic polyphenyl dye-containing wastewater.
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JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Shuo Wang,Zhenke Chen,Ying Zhao,Chenlu Sun,Jianye Li
In this work, the unique starlike La-doped ZnO–SiO 2 photocatalysts were constructed by an evaporation and calcination method and characterized in detail. UV–vis reflectance and DFT calculation confirm that the doping with La allows to obtain a decrease of band gap of ZnO/SiO 2 , which enhances visible light absorbance and oxidizing ability. The photoluminescence intensity reduces greatly, indicating more effective separation of the photogenerated carriers of La-doped ZnO-SiO 2 . Photocatalytic activities of La-doped ZnO-SiO 2 with different doping ratios under simulated visible light irradiation were evaluated with malachite green (MG) as a model pollutant. Under optimized conditions including solution pH of 8, 15 mg/L of MG solution and 15 mg of catalyst dosage, 0.2% La-ZnO-SiO 2 exhibits the best catalytic activity in photodegradations of MG in water. The removal and mineralization efficiency of MG can reach 96.1% and 70.9% in 140 min, respectively. The as-prepared catalysts present superior stability and recyclability after four times reuse. Moreover, selective quenching experiments indicate that hydroxyl radical (·OH), hole (h + ) and superoxide radical (·O 2 - ) are the main reactive species responsible for MG degradation. Possible mechanism for photocatalytic elimination of MG over La-doped ZnO/SiO 2 photocatalyst is finally proposed.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Ping Zhang,Deyi Hou,David O’Connor,Xuanru Li,Simo Pehkonen,Rajender S. Varma,Xun Wang
Many challenges remain for the mass production of nanoparticles for the removal of contaminants from water, primarily due to the complexity of the synthetic protocols involved and the use of hazardous reagents. Although the development of phytosynthetic methods for the green fabrication of nanomaterials have seen keen interest, there remains much scope for improvement in terms of maximizing adsorption capacity and controlling the size of the nanoparticles produced. A green and sustainable pathway is described using Virginia creeper (Parthenocissus quinquefolia) leaf extract in the presence of oxalic acid for the synthesis of earth abundant Fe,Cu-based nanoparticle adsorbents. This optimized green method could produce Fe,Cu-based nanoparticles with a remarkably high maximum adsorptive capacity (1399 mg g–1) for aqueous Malachite Green (MG) removal. Furthermore, various particle sizes (between 160 and 1000 nm) were attained by simply varying the amount of oxalic acid. The synthesized adsorbent displayed other excellent characteristics, including (i) maintaining a high adsorption capacity over a wide range of pH conditions, (ii) remaining chemically stable under an ambient storage environment, and (iii) having good recycling potential, with consistent removal efficiency observed over four adsorption/desorption cycles. This work not only promotes the use of natural, earth-abundant, and renewable resources in synthesizing novel and efficient absorbents but also provides a simple, convenient, and cost-effective strategy for the purification of dye-laden wastewater.
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Journal of Nano Research
·
2018
·
IF 0.665
Wen Ting Liang,Dan Li,Xue Wen Ma,Wen Juan Dong,Jing Li,Rui Fang Wu,Chuan Dong,Qing Chen Dong
Surface β-cyclodextrin polymer coated Fe3O4 magnetic nanoparticles (NPs) were prepared by anchoring pyromellitic dianhydride derivate-b-cyclodextrin polymer (b-CD-P) onto the surface of Fe3O4 magnetic NPs, which is generated in situ through a co-precipitation method. The transmission electron microscopy (TEM) result indicates that Fe3O4@β-CD-P NPs have an effective average size of 15 ± 2 nm. The surface coated layer β-CD-P was confirmed by Fourier-Transformed Infrared Spectroscopy, and the amount of which was determined to be 138.2 mg g-1 by thermogravimetric analysis. To explore the potential application of such nanocomposites for organic pollutants adsorption, malachite green (MG), a typical cancer-causing water pollutant was evaluated by spectrophotometric method. It was finally learnt that, the adsorption rate of MG by Fe3O4@β-CD-P NPs follows pseudo-second-order kinetics with adsorption isotherm fitted by the Langmuir isotherm model well. The maximum adsorption capacity was measured to be 88.49 mg g-1 at 25 °C. Additionally, a good recyclability of the Fe3O4@β-CD-P was observed over four usage cycles, with slight decrease of adsorption capability.
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CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Xiaoli Li,Yun Zhang,Lingyun Jing,Xinghua He
A newly designed N-doped CNTs stabilized Cu 2 O nanoparticles (PVP@CNTs-Cu 2 O) were fabricated and used to remove organic pollutants such as Malachite Green (MG) dye and tetrabromobisphenol A (TBBPA). The introduction of PVP here not only could stabilize Cu 2 O nanoparticles, but also act as active sites for adsorption of organic pollutants. The hybrid mesoporous adsorbent exhibited excellent adsorption performances for MG and TBBPA, which were mainly because of the synergistic effects of inorganic species and polymer. The maximum adsorption capacities of MG and TBBPA by PVP@CNTs-Cu 2 O were 1495.46 and 116.72 mg/g, respectively, significantly higher than pristine CNTs (417.58 and 68.03 mg/g, respectively). The adsorption of MG was independent of ionic strength. In contrast, the increase in ionic strength significantly inhibited the adsorption of TBBPA. Freundlich isotherm model fitted well with the experimental data of both MG and TBBPA adsorption, indicating the heterogeneous surface of PVP@CNTs-Cu 2 O. PVP@CNTs-Cu 2 O demonstrated rapid adsorption rates for both MG and TBBPA, and their adsorption kinetics were analyzed by the pseudo-first-order, pseudo-second-order and Elovich kinetic models. The possible mechanisms of MG and TBBPA adsorption was further explored by means of FTIR and XPS. High adsorption capacity, rapid kinetics, good reusability as well as simple preparation were important advantages for the practical application in MG and TBBPA removal by PVP@CNTs-Cu 2 O.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 10
·9585-9597
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IF 2.76
Yang Xueting,Zheng Jinzhao,Lu Yongming,Jia Rong
Malachite green (MG), a recalcitrant, carcinogenic, and mutagenic triphenylmethane dye, was decolorized and detoxified using crude manganese peroxidase (MnP) prepared from the white rot fungus Irpex lacteus F17. In this study, the key factors (pH, temperature, MG, Mn 2+ , H 2 O 2 , MnP) in these processes were investigated. Under optimal conditions, 96 % of 200 mg L −1 of MG was decolorized when 66.32 U L −1 of MnP was added for 1 h. The K
m , V
max , and k
cat values were 109.9 μmol L −1 , 152.8 μmol L −1 min −1 , and 44.5 s −1 , respectively. The decolorization of MG by MnP followed first-order reaction kinetics with a kinetic rate constant of 0.0129 h −1 . UV–vis and UPLC analysis revealed degradation of MG. Furthermore, seven different intermediates formed during the MnP treatment of 0.5 h were identified by LC-TOF-MS. These degradation products were generated via two different routes by either N -demethylation of MG or the oxidative cleavage of the C–C double bond in MG. Based on ecotoxicity analyses performed on bacteria and algae, it was confirmed that MG metabolites produced by the MnP-catalyzed system were appreciably less toxic than the parent compound. These studies indicate the potential use of this enzyme system in the clean-up of aquatic and terrestrial environments.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mingyue Ye,Xianfeng Lin,Jin Li,Xiaowan Chen,Dichen Ying,Shijia Wu,Zhouping Wang,Nuo Duan
Malachite green (MG) has been illicitly employed in aquaculture as a parasiticide, however, its teratogenic and carcinogenic effects pose a significant human health threat. Herein, a dual-mode colorimetric and electrochemical aptasensor was fabricated for MG detection, capitalizing on the robust catalytic and peroxidase-like activity of P-CeO 2 NR@Mxene and good capture efficiency of a tetrahedral DNA nanostructure (TDN) designed with multiple aptamers (m-TDN). P-CeO 2 NR@Mxene-modified complementary DNA (cDNA) served as both colorimetric and electrochemical probe. m-TDN was attached to AuE to capture MG and P-CeO 2 NR@Mxene/cDNA. The superior aptamer and MG binding to cDNA regulated signals and enabled precise MG quantification. The further introduced Exo I enabled aptamer hydrolysis, releasing MG for further binding rounds, allowing target recycling amplification. Under the optimal conditions, the aptasensor reached an impressively low detection limit 95.4 pM in colorimetric mode and 83.6 fM in electrochemical mode. We believe this dual-mode approach holds promise for veterinary drug residue detection.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Yimeng Zhang,Chuanliang Wang,Guo Wei,Xuesong Wang,Wanhui Liu,Gangqiang Yang,Peng Zhang,Qinglian Li,Xuhui Geng,Lingxin Chen,Zhihua Song
Malachite green (MG) possesses high toxicity, therefore, the detection of MG in fish tissues is of vital importance. A novel core–shell MIPs doped CdTe quantum dots coated silica nanoparticles (CdTe-MIP/SiO 2 NPs) were synthesized via a simple one-pot strategy. The materials were characterized carefully. The resulting CdTe-MIP/SiO 2 NPs were coated on the thin layer chromatography plate, and coupled with miniaturized fluorimeter for fluorescence detection of MG in fish samples. The resulting CdTe-MIP/SiO 2 NPs based system possessed good linearity (0.01 ∼ 20 μmol/L), high recoveries (98.36 %∼101.45 %) and low detection limit (3.7 nmol/L) for MG. Furthermore, CdTe-MIP/SiO 2 NPs based system were employed to measure fish samples spiked with MG, meanwhile, HPLC was utilized to evaluate the accuracy and reliability. And the paired t -test was conducted to evaluate differences between fluorescence method and HPLC, P > 0.05 means no significant difference was observed, the results demonstrated that both fluorescence method and HPLC are suitable for MG analysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Dongbin Yang,Longbin Li,Wen Xu,Zhaoping Jia,Jiandu Lei,Jing Liu
Multi-component structural composites to tune the energy band structure of photocatalysts can achieve higher activity. In this study, flaky CNFC@Bi 2 O 3 composites with high dispersibility were synthesised by a one-step calcination method using CNF as a template. The morphology and composition of the materials were characterized by SEM, XPS, XRD, PL, UV–vis DRS, TOC and LC-MS. The abundance of functional groups on the surface of the CNF-derived carbon induces the formation of this morphology, and the composite forms a direct Z-type heterojunction with good response in the visible region. The degradation of malachite green dye under visible light irradiation at 465 nm was found to be 758.64 mg g −1 in 5 h. There was a significant increase in the degradation of malachite green dye compared to the composite BC@Bi 2 O 3 prepared with bamboo cellulose(BC) as a template (425.76 mg g −1 ). The findings indicated that CNFC@Bi 2 O 3 dye removal exhibited the highest level of efficacy in comparison to CNF/0.3Bi (473.04 mg g −1 ) and CNF/1.7Bi (545.52 mg g −1 ). The best degradation of malachite green was found to occur in a weakly alkaline environment, with the order of effect of free radicals being: h + > ·OH> ·O 2 - . The results indicate that the CNFC@Bi 2 O 3 composites have great potential for dye wastewater degradation and environmental remediation, and provide a new idea for the synthesis of sustainable, eco-friendly and high performance photocatalysts.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2012
·Vol. 42
·期 7
·509-516
·
IF 1.745
Xu Minrong,Zhu Jianying,Su Haichao,Dong Jing,Ai Shiyun,Li Rong
A novel poly(malachite green)/graphene nanosheets–nafion (PMG/GNs–NF) composite film-modified glassy carbon electrode was developed to indirectly detect methyl parathion (MP). p -nitrophenol, the alkaline hydrolysis product of MP, was successfully determined at a relatively lower potential using this modified electrode due to the excellent electrocatalytic activity of PMG/GNs–NF composite film. The presence of GNs in the composite film enhanced the stability of PMG and increased the electron transfer rate. The kinetic parameters of modified electrodes were studied. What is more, the optimum experimental parameters affecting response were selected in terms of pH, accumulation potential, accumulation time, scanning cycles during polymerization of malachite green, and alkaline hydrolysis conditions. Under optimum conditions, the chronoamperometric response current was proportional to MP concentration over the range from 0.02 to 1.5 μM with a low-detection limit of 2.0 nM. Finally, the sensor was applied for the determination of MP in real samples, and the results were satisfactory with recoveries from 97.20 to 104.53 %. Due to its simple preparation, good reproducibility, and stability, this developed modified electrode provides a new platform for the detection of organophosphate pesticides.
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