JOURNAL OF NON-CRYSTALLINE SOLIDS
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2017
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IF 2.124
Jungang Cao,Haibao Lu,Min Yang,Qun Wang,Zhonglin Wei,Jianjun Li
Photoluminescence properties of Rhodamine 6G dye confined in electrospun silica fiber are investigated in this manuscript. Uniaxial tensile test and environmental stability of such hybrid fibers are examined. Homogeneous distribution of Rhodamine 6G in silica fibers is confirmed by fluorescence image. Only J-type dimers are confirmed in our electrospun Rh6G/SiO 2 hybrid fibers, and the increase of the Rh6G concentration gives rise to a progressive red shift and a broadening in the maximum emission spectra. The emission intensity of electrospun hybrid fibers can be sensitive to the temperature and the relative maximum emission intensity may decrease gradually in the whole measured temperature range.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Bing Tan,Huimin Zhao,Yaobin Zhang,Xie Quan,Zehao He,Wenting Zheng,Bingyu Shi
Phytic acid (PA) induced graphene macrostructures were synthesized and investigated for the sorption characteristics and mechanisms of mercury. The as-synthesized graphene foam possessed large specific surface area and amphiphilicity. FTIR and XPS analysis revealed that the as-prepared graphene macrostructure retained oxygen-containing functional groups after hydrothermal reduction and also captured new phosphorus-containing groups because of the introduction of PA. Different experimental parameters, such as pH, PA fractions and contact time were applied to probe into the Hg(II) adsorption performance of as-synthesized macrostructure. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well to the obtained sorption kinetic and isothermal data. The maximum adsorption capacity at pH = 7.2 for mercury was 361.01 mg/g. The dominant mechanisms for mercury removal were mainly ion exchange and surface complexation. Real application in river water and seawater exhibited very promising results, indicating its broad prospect in water purification .
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ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Jingyuan Guo,Chenxin Dong,Xiang Zhang,Yujia Liu,Yumin Leng,Guo Wang,Zhengbo Chen
Background In recent years, environmental pollution has attracted widespread global attention. Among them, environmental problems caused by heavy metal pollution pose a serious threat to human health and ecosystems. Mercury is a common heavy metal pollutant with high toxicity and wide distribution. Excessive intake of Hg 2+ can cause permanent and severe damage to the nervous system, respiratory system, and kidneys in the human body. Therefore, developing both accurate and fast detection methods for Hg 2+ is of great significance. Results A sensitive Hg 2+ colorimetric sensor is designed based on PtNi nanowires (NWs) and Pt NWs with peroxidase-mimetic activity. PtNi NWs and Pt NWs catalyze the reaction of 3,3′, 5,5′-tetramethylbenzidine (TMB) with hydrogen peroxide (H 2 O 2 ) to produce blue oxidized TMB (oxTMB). The specific interaction of Pt–Hg significantly inhibits the peroxidase-mimetic activity of PtNi NW and Pt NW nanozymes, resulting in a lighter blue color. It is worth noting that compared with specific activity (SA) of Pt NWs (3.31 U/mg), PtNi NWs own superior SA (10.43 U/mg), which inevitably leads to a wider linear range of Hg 2+ analysis (1 nM-200 μM) and a lower detection limit (0.6748 nM) for PtNi NWs-based colorimetric sensor, versus linear range (4 nM-5 μM) and LOD of 1.198 nM for Pt NWs-based colorimetric sensor, which are far below the Hg 2+ threshold (10 nM) for drinking water set by the US Environmental Protection Agency. Significance : The two nanozyme colorimetric sensors have been successfully used for the evaluation of Hg 2+ in complex river water and tap water. Due to the advantages of simple operation, fast response, and high sensitivity, colorimetric sensors have broad application prospects in environmental monitoring.
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RSC Advances
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2016
·Vol. 6
·期 100
·97523-97531
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IF 3.289
Yichang Yu,Zhangjun Hu,Zhenyong Chen,Jiaxiang Yang,Hongwen Gao,Zhiwen Chen
A disulfide-grafted polyethyleneimine (PES)@Mg2SiO4 composite was synthesized, characterized, and used successfully to remove heavy metals from wastewater. It was grafted with a huge number of dithiocarbamate moieties as sites for specific adsorption. By comparative studies, it was found that the morphology, structure and properties were influenced by the trapped organic components in the composites. PES@Mg2SiO4 exhibits a larger specific surface area and better adsorption activity compared with Mg2SiO4, polyethyleneimine (PEI)@Mg2SiO4 and PEI@Mg2SiO4–CS2. The adsorption behaviors of the obtained composites were investigated for the recovery of Hg2+, Pb2+ and Cd2+. PES@Mg2SiO4 shows the highest adsorption capacities of 714 mg g−1 for Hg2+, 400 mg g−1 for Pb2+ and 323 mg g−1 for Cd2+, which fits the Langmuir isotherm model. Besides this, it also exhibits excellent adsorption capacity for Cu2+, Bi3+ and metal complexes. Its application in petrochemical wastewater demonstrates its enormous potential for heavy metal wastewater treatment.
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RSC Advances
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2017
·Vol. 7
·期 45
·28556-28563
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IF 3.108
Jianzhi Huang,Silan Bai,Guoqing Yue,Wenxue Cheng,Lishi Wang
In this work, we firstly propose and confirm a novel coordination matrix/signal amplifier strategy to construct a highly sensitive lead(II) electrochemical sensor. Lead(II) ions can be efficiently accumulated and deposited on the electrode surface by strong coordination bonds between the unoccupied d-orbital of lead(II) ions and conjugated π-electron backbones of polyfurfural film (coordination matrix), and then the anodic stripping current can be significantly enhanced by multi-walled carbon nanotubes (MWCNTs, signal amplifier), finally realizing the highly sensitive determination of lead(II). The polyfurfural film/MWCNT modified glassy carbon electrode (GCE) sensor provided a wide linear detection range from 0.05 to 10 μg L−1 and a low detection limit of 0.01 μg L−1 (S/N = 3) for lead(II). Compared with a classical mercury film sensor (a classical and effective method for determining heavy metal ions), our proposed sensor was more sensitive and achieved better results. Moreover, based on the coordination matrix/signal amplifier strategy, the polyfurfural film/MWCNTs/GCE sensor was further successfully utilized for the simultaneous determination of Cd2+, Pb2+, Cu2+, and Hg2+, demonstrating a wide linear detection range for Cd2+ (0.5–15 μg L−1), Pb2+ (0.1–15 μg L−1), Cu2+ (0.1–12 μg L−1), and Hg2+ (1.5–12 μg L−1) and a low detection limit for Cd2+ (0.03 μg L−1, S/N = 3), Pb2+ (0.01 μg L−1, S/N = 3), Cu2+ (0.06 μg L−1, S/N = 3), and Hg2+ (0.1 μg L−1, S/N = 3). Finally, the proposed sensor was successfully applied to simultaneously determine Cd2+, Pb2+, Cu2+, and Hg2+ in real tap water samples. This work provides a novel and effective analytical strategy for constructing novel electrochemical sensors and shows broad application prospects in heavy metal ion determination for the future.
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Analytical Methods
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2015
·Vol. 7
·期 15
·6103-6108
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IF 1.821
Yuling Hu,Dongmei Wang,Gongke Li
Inspired by the bioadhesive and redox properties of the 3,4-dihydroxy-phenylalanine (DOPA) contained in marine mussels, a facile, rapid and economic colorimetric strategy for Hg2+ detection was developed. The abundant catechol chains on the surface of Ag@DOPA can reduce Hg2+ to Hg0 and form a Ag@DOPA@Hg nanostructure with the deposition of Hg0. The nanostructures of Ag@DOPA and Ag@DOPA@Hg were confirmed by X-ray photoelectron spectroscopy, transmission electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The formation of the Ag@DOPA@Hg nanostructure causes a change in the color of the Ag@DOPA colloids from golden yellow to purple blue, making it directly possible to detect Hg2+ using a colorimetric strategy within 5 minutes. With increasing concentrations of Hg2+ from 10 nM to 4 μM, the surface plasmon resonance absorbance peak of the Ag@DOPA colloids decreased in intensity and exhibited a good linear relationship with the Hg2+ concentration. The limit of detection was determined as 5 nM. Furthermore, this response was found to be highly selective for Hg2+ as the absorption spectrum was not affected by other metal ions such as Pb2+, Cr3+, Cu2+, Al3+, Ni2+, Co2+, etc. The excellent stability, selectivity and sensitivity of this strategy offer analytical practicability for Hg2+ detection in real water samples with recoveries in the range of 104–105% and cosmetic samples with recoveries in the range of 85–103%.
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INORGANIC CHEMISTRY
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2024
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IF 4.3
Minglun Cheng,Sibo Shen,Zhiwei Zhang,Kui Niu,Ning Wang
Electroreduction of CO2 to value-added low-carbon chemicals is a promising way for carbon neutrality and CO2 utilization. It was found that the diiron complex [(μ-bdt)Fe2(CO)6] (bdt = benzene-1,2-dithiolate) has high catalytic activity for electrocatalytic CO2 reduction. To further study the effect of the S-to-S bridge on the catalytic performances of diiron complexes for electrochemical CO2 reduction, four diiron complexes 1–4 with different rigid and conjugated S-to-S bridges were either selected or designed. The electrocatalytic studies showed that under optimal conditions, 2 with a 2,3-naphthalenedithiolato bridge exhibited the lowest catalytic onset potential (Eonset = −1.75 V vs Fc+/0), while 4 with a diphenyl-1,2-vinylidene bridge displayed the highest catalytic activity (TOFmax = 295 s–1), which is 1.5 times that of [(μ-bdt)Fe2(CO)6]. The controlled potential electrolysis experiments of 4 in 0.1 M MeOH/MeCN at −2.35 V vs Fc+/0 gave a total faradaic yield close to 100%, with selectivities of 77%, 9%, and 14% for HCOOH, CO, and H2, respectively. The mechanism for CO2 reduction was studied using density functional theory, IR spectroelectrochemistry, and electrochemical methods. The results indicate that modifying the structure of the S-to-S bridge is an effective strategy to improve the catalytic performance of diiron complexes for electrocatalytic CO2 reduction.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Meipeng Jian,Xiaoqin Yang,Congxin Huang,Chaochun Tang,Xiwang Zhang,Ruiping Liu,Haiyan Li
Flexible metal–organic frameworks (MOFs) with the gate opening feature can optimize the removal efficiency on the adsorption behavior by accommodating to the specific target molecules. In this study, a flexible MOF denoted as NH 2 -MIL-53(Al) was investigated to remove Hg(II) from water, in which the adsorption capacities of large-pore NH 2 -MIL-53(Al) (NH 2 -MIL-53(Al)-LP) for Hg(II) reached 433.20 mg/g, which is about 4 times higher than narrow-pore NH 2 -MIL-53(Al) (112.75 mg/g). Further, the kinetic experiment also revealed that nearly 90 % Hg(II) can be captured within 60 min for NH 2 -MIL-53(Al)-LP. Advanced characterizations and density functional theory calculations demonstrated that the strong coordination of the amino and oxygen centers on NH 2 -MIL-53(Al)-LP to Hg(II). Importantly, molecular dynamic simulation verified the gate opening effect of NH 2 -MIL-53(Al)-LP, as the faster diffusivity of Hg(II) ions in NH 2 -MIL-53(Al)-LP was observed. This work provides another opportunity in designing the pore geometry of porous materials for water remediation.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yuyan Zheng,Zinan Li,Meiling Chen,Jiyang Zuo,Tao Yang,Wenhua Miao,Yadong Zhao,Fei Liu,Jinggang Wang,Jin Zhu
The high value-added utilization of cellulose with various functions is a hot topic in the field of bio-based materials. The existing high value-added utilization methods mainly rely on the dissolution and functionalization of cellulose in two steps in a homogeneous system. Herein, a new CS 2 /DBU/DMSO solvent system was successfully designed by combining viscose and CO 2 switchable solvent, and then obtained regenerated product (DCC) with metal ion detection and antibacterial functions through a simple process from dissolution to regeneration. Cellulose dissolves mildly and efficiently in this system. In addition, the metal ion test paper prepared from DCC can quickly respond to Co 2+ , Cu 2+ , and Fe 3+ ions and produce significant visual color changes in a short period of time. Finally, the experiment showed that the DCC film has good antibacterial activity against S. aureus and E. coli . This study lays the foundation for the dissolution, derivation, and processing of cellulose, and provides new ideas for the production of functional materials using cellulose in the future.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yue Gao,Jian Zhang,Jing Guo,Zhaoshuai Shao,Yuanhang Ming,Lifang He,Qian Chen,Kui Zhang
Colorimetric, fluorescent, or phosphorescent sensing methods are powerful tools for mercury ion detection and determination. However, single- or dual-signal readouts generated by one or two of these techniques cannot be applied in various practical scenarios due to the different requirements for mercury ion (Hg 2+ ) detection. Herein, a novel colorimetric, fluorescent, and phosphorescent triple-signal readout method was developed for the rapid, sensitive, and accurate detection of Hg 2+ with high anti-interference. Due to the inner filter effect (IFE), the fluorescence and phosphorescence of Mn 2+ -doped Zn 2 GeO 4 nanorods (ZGO:Mn NRs) were first quenched by hemi-cyanine dye (HCD). However, after adding Hg 2+ ions, the absorption peak of HCD shifted from 565 nm to 464 nm, and the color changed from purple to yellow. The quenched fluorescence and phosphorescence of ZGO:Mn NRs were restored by the elimination of IFE through HCD coordination with Hg 2+ . The resulting triple-signal response displayed linear detection ranges toward Hg 2+ of 2–11, 8–35, and 57–134 μM with detection limits of 0.103, 0.032, and 2.346 μM, respectively. When the method was used for the detection of Hg 2+ in spiked real water and traditional Chinese medicine samples, it showed remarkable color changes and satisfactory recoveries in the range of 91.48 % to 108.51 %. In the complex matrixes of whitening creams or emulsions, the phosphorescent signal readout mode was less susceptible to the interference of background luminescence. Overall, this proposed method will greatly broaden multi-signal readout modes’ applicability under multiple scenarios such as applications in medical diagnostics, food safety, and environmental monitoring.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Tao Wu,Hassan Karimi-Maleh,Yan Li,Zhouxiang Zhang,Dongxing Zhang,Yangping Wen,Li Fu,Nianbing Zhong,Elena Niculina Dragoi,Tejraj M. Aminabhavi
MOFs/MXene adsorbent was prepared by in-situ growth of MOFs(ZIF-67/ZIF-8) crystal particles onto the surface and between the layers of multi-layer MXene substrate. The method followed complex separation and recovery steps after completion of adsorption and there can be a risk of secondary contamination. To avoid this, DLP technique was used to print a series of 3D printed structures (3DS) with a specific topography, the prepared MOFs/MXene composites were loaded onto surface of the structure. Polydopamine (PDA) was then coated onto the surface to prepare monolithic adsorbent (PDA/MOFs/MXene/3DS) that was easily separated and recovered. The adsorbent was characterized by SEM, XRD, FTIR, TGA and XPS, while the batch adsorption of CR and Hg (II) was performed under different experimental conditions. The optimal removal rate and maximum adsorption of the monolithic adsorbent for CR and Hg (II) were 99.13/94.10 % and 75.76/464.48 mg/g, respectively and adsorption followed chemisorption onto the surface monolayer, which was spontaneous and exothermic. Multiple cycle tests showed excellent removal of CR (82.29 %) and Hg (78.47 %). In addition, adsorbent with synergistic effects of electrostatic interactions, H-bonding and π-π stacking shows a good adsorption effect. The study proved that that PDA/MOFs/MXene/3DS is a high-strength, structurally designable, green and promising adsorbent for large-scale remediation of real contaminants frpm wastewater.
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JOURNAL OF FOOD SCIENCE
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2024
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IF 3.2
Xi Wu,Chenggang Geng,Weiwei Cheng,Zhenjiong Wang,Yan Zhang,Di Wu,Xiaozhi Tang
In this work, an ultrasensitive electrochemical sensor based on Zr-MOF-SH/rGA/NPG was developed for the first time for the rapid determination of mercury ions. First, nanoporous gold (NPG) film was covered on the glassy carbon electrode (GCE) to offer a desirable substrate. Then, Zr-MOF-SH/rGA composites were dropped on the NPG film to form a modified electrode. Mercapto functionalized MOFs (Zr-MOF-SH) showed strong adsorption capability toward mercury ions, and the unique structure of reduced graphene oxide aerogel (rGA) provided various sites for coupling with Zr-MOF-SH as well as improved the electrochemical activity. As a consequence of the synergistic effect of Zr-MOF-SH, rGA, and NPG, the optimized Zr-MOF-SH/rGA/NPG/GCE sensor showed excellent detection performance toward mercury ions with a linear range from 0 to 200 nM and a low limit of detection of 1.4 nM. Meanwhile, the fabricated electrochemical sensor exhibited outstanding stability, reproducibility, and anti-interference ability. To verify the practical applicability, the Zr-MOF-SH/rGA/NPG/GCE was applied for the determination of mercury ions in real rice samples with desirable recovery rates ranging from 98.8% to 108.3%.
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危险品化学品经营许可证（带存储）