SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Wenxuan Li,Peifeng Li,Feiqiang He,Xiaoping Zhang,Yuling Zhu,Jianhua Ding
In this study, a foam fractionation technique was developed for the separation and enrichment of the trace m-phenylenediamine (MPD) and o-phenylenediamine (OPD) in solution. Firstly, a self-designed foam fractionation device was assembled and built, followed by a comprehensive characterization on gas types, foam fractionation column parameters, and porous sieve plate material used in the apparatus. Subsequently, the most crucial parameters for the separation and enrichment, such as surfactant species, solution pH, electrolyte categories, and gas flow rate, were identified and optimized. The mechanisms of key processes during foam fractionation under the influence of these parameters were thoroughly discussed. Other influencing factors, such as surfactant concentration, foam collection time, and solution volume in the fractionation column, were optimized using response surface methodology (RSM). Under these optimal conditions, maximal enrichment ratios of 138.2 and 85.5 were achieved for MPD and OPD, respectively. Finally, foam fractionation coupled with high-performance liquid chromatography (HPLC) was employed to detect MPD and OPD in the solution. The results demonstrated limits of detection (LOD) of 1.5 × 10 −2 μg/L and 1.5 μg/L for MPD and OPD, with relative standard deviation (RSD) values of 4.1 % and 3.9 %. When testing various actual samples, the recoveries were in the range from 92.0 % or greater in all cases. The method exhibited advantages of high sensitivity, precision, and accuracy, attributed to the high enrichment efficiency of foam fractionation. In conclusion, the foam fractionation method established in this study offers simplicity in apparatus, operational convenience, environmental friendliness (minimized use of organic solvents), and high enrichment efficiency. It proves valuable for the quantitative analysis of trace amounts of MPD and OPD in solution, presenting a novel approach for the detection of trace organic compounds in solutions.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 12
·2770-2777
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IF 7
Shanhao Hao,Cheng Fu,Lin Zhou,Zhanghong Guo,Qijun Song
Iridium nanoparticles with an average size of 1.7 nm (Tar-IrNPs) were synthesized by the reduction of IrCl3 with NaBH4 in the presence of tartaric acid. As prepared Tar-IrNPs showed not only oxidase, peroxidase and catalase activities but also exhibited unprecedented laccase-like activity, which can catalyze the oxidation of the substrates o-phenylenediamine (OPD) and p-phenylenediamine (PPD) accompanied by significant color changes. The superb catalytic performance is evidenced by the fact that Tar-IrNPs can achieve better laccase-like activity with only 2.5% of the dosage of natural laccase. Furthermore, they also exhibited superior thermal stability and broader pH adaptability (2.0–11) over that of natural laccase. Tar-IrNPs can retain more than 60% of their initial activity at 90 °C, while the natural laccase has totally lost its activity at 70 °C. At a prolonged reaction time, the oxidation products of OPD and PPD can form precipitates due to oxidation induced polymerization. Thus Tar-IrNPs have been successfully used for the determination and degradation of PPD and OPD.
研究领域:
材料科学
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催化
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分析化学
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Xue-dong Wang,Ya Li,Tao-tao Dai,Xue-mei He,Ming-shun Chen,Cheng-mei Liu,Rui-hong Liang,Jun Chen
Novel pectin/poly(m-phenylenediamine) (P/PmPDA) microspheres with different content of PmPDA were prepared by assembling PmPDA on the surface of pectin microsphere. The successful preparation was confirmed by the results of Fourier Transform Infrared spectra (FTIR), scanning electron microscopy (SEM) and elemental analysis. Compared with pectin microsphere, the Pb 2+ adsorption performance of P/PmPDA microspheres was significantly improved. The results of batch adsorption experiments were in good agreement with the Langmuir isotherm model for Pb 2+ adsorption, indicating the adsorption was monolayer. The maximum adsorption capacity of Pb 2+ was found to be 390.9 mg/g. The kinetic adsorption process was well described by the pseudo-second-order model and chemical adsorption dominated the adsorption process. The potential mechanisms of Pb 2+ adsorption were speculated as ion exchange and chelation, which were supported by X-ray photoelectron spectroscopy (XPS). The P/PmPDA microspheres showed good recyclability after five adsorption/desorption cycles. All these results indicated the potential of P/PmPDA microspheres for removing Pb 2+ .
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
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IF 5.097
Kamile Arkin,Yuxin Zheng,Jiawei Hao,Siyi Zhang,Qingkun Shang
The use of nanomaterials such as carbon dots (CDs) as rapid detection fluorescent nanoprobes is a hot topic in the field of analytical chemistry. In this paper, blue, green, and red CDs with high fluorescence quantum yields (24, 54, and 38%, respectively) were obtained from m-phenylenediamine and urea by hydrothermal synthesis and chromatographic separation. After investigating the structures and properties of the obtained CDs, three distinct and sensitive fluorescent nanoprobes with different functions were successfully constructed. The first nanoprobe derived from blue CDs could be used to detect the pH of a strong acid solution (pH 3.0); a rapid detection kit was designed based on it. The second nanoprobe based on Green CDs with ellagic acid (EA) modification allowed the sensitive determination of Fe3+ ions in aqueous solutions. The final probe derived from Red CDs could be used to test for organic acids in liquor. The test results of the commercial liquor were consistent with the standard methods. The detection mechanism of the three fluorescent probes was proposed. Using CDs to construct multifunctional fluorescent nanoprobes is beneficial for the application of CDs to rapid and specific detection and recognition.
研究领域:
分析化学
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纳米材料科学
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DOI
高影响因子
Materials Today Chemistry
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2024
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IF 6.7
Pinyi He,Jianliang Bai,Fu Qin,Xinyu Wang,Xu Yu,Yongkang Yao,Lili Ren
Deep-blue emission (＜450 nm) is significant in high-density information storage, solid-state lighting, and vivid displays. However, the carbon dots (CDs) obtained from p-phenylenediamine (pPD) have only red fluorescence, which greatly limits the application and development of pPD-based CDs. As we all know, a catalyst is a substance that can change the rate and pathway of a chemical reaction. Herein, we designed to add a catalyst to realize the conversion of pPD-based CDs from red to deep-blue fluorescence. The emission peak of obtained deep-blue CDs was 440 nm, and the full-width at half-maximum (FWHM) was only 58 nm, with a high color purity. In addition, through in-depth analysis of microstructure and photoluminescence (PL) properties, it is found that the decrease of the sp 2 -conjugated domain and the graphite N content and the increase in pyridinic N content were the main reasons for the blue shift of the spectra. Based on this, the formation process and mechanism of red and deep-blue CDs were further elucidated. This work not only efficiently realized the design of the deep-blue CDs but also provided a new idea for the luminescence regulation of CDs without changing the raw materials and reaction conditions.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 17
·7920-7932
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IF 8.867
Lina Xu,Jia Xu,Baotian Shan,Xiulin Wang,Congjie Gao
Novel thin-film composite (TFC) membranes were elaborately designed and fabricated via the incorporation of mussel-inspired dopamine (DA) into an m-phenylendiamine (MPD) aqueous solution followed by interfacial polymerization with trimesoyl chloride (TMC) on a macroporous substrate. This DA-incorporation strategy was distinct from the previous DA layer serving as a hydrophilicity–promoter or reactive intermedia. The elastic structure of the polyamide (PA) layer and the hydrophilicity of both the PA layer and substrate were in situ flexibly manipulated by regulating the DA/MPD mass ratio and solution pH. The optimized TMC/MPD–DA TFC membranes achieved a significantly enhanced water flux (50 L m−2 h−1, improved 3-fold compared to the conventional TMC/MPD membrane) and a comparable reverse salt flux of 8.19 g m−2 h−1 for forward osmosis (FO) using deionized water as the feed along with 1 M NaCl draw solution in the FO mode. It also yielded a superior water permeability (A) of 1.8 L per m2 per h per bar compared to the TMC/MPD membrane (1.0 L per m2 per h per bar) while maintaining a NaCl rejection of over 92% at 2 bar. The proposed synergistic interaction between DA and MPD in aqueous solution responding to the solution pH played a crucial role in controlling the interfacial polymerization process. Michael addition and Schiff base reaction between PDA and MPD at a proper pH (8.5) could weaken both the residual DA monomer and the PDA aggregate generation, facilitating the establishment of a defect-free and uniform PA layer with a proper cross-linking degree to enhance the water transport. This DA-incorporation strategy for the TFC membrane demonstrated here sheds light on the exploration of high water transport for highly efficient FO and other desalination processes.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2020
·Vol. 25
·期 2
·683-688
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IF 2.646
Yu Qizhi,Kong Xiangfa,Chen Chaoshu,Kang Caiyan,Meng Mianwu,Huang Siyu
An Ag nanoparticles (NPs) layer was synthesized on Ag sheet by alloying/electrochemical dealloying method: X-ray diffraction confirmed that the new Ag phase appeared after removing Ga from Ag-Ga alloy, and scanning electron microscopy examination showed that the prepared Ag layer had a NPS structure. The fine microstructure of silver resulted in significant SERS enhancement effect, while the NPs layer was used as the SERS substrate: when the prepared NPs layer was used as a SERS substrate to detect p-phenylenediamine (PPD), it exhibited a strong SERS peak at 1590 cm −1 . The result revealed that the intensity of SERS peaks was linear to the logarithm of PPD concentration in the range from 10 −16 mol L −1 to 10 −12 mol L −1 and the detection limit was 1.0 × 10 −17 mol L −1 .
研究领域:
分析化学
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纳米材料科学
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光谱学
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
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IF 3.7
Zhicheng Tang,Tianwei Wang,Hua Lin,Shoulong Hao,Shufen Zhang,Rongwen Lu
Amination of 1-amino-4-bromoanthraquinone-2-sulfonic acid (BAA), crucial for anthraquinone-type dyes production, relies on Cu+ catalysis. However, Cu+ disproportionation causes catalyst deactivation, requiring large amounts of Cu catalysts (e.g., CuSO4 or CuCl) and reductants (e.g., FeSO4), introducing heavy metals and increasing water consumption to remove byproducts and metals, raising both environmental and economic costs. To address these challenges, we introduce a groundbreaking strategy for the in-situ generation of Cu+ using symmetrical Cu electrodes under alternating current (AC) electrolysis. This method achieves 100% conversion of BAA in the amination with 3,5-diamino-2,4,6-trimethylbenzene sulfonic acid (M Acid) with 95% yield, while also providing a solution to the issue of Cu+ disproportionation without the need for any additional copper catalysts or reductants, demonstrating a broad substrate scope and significantly reducing water usage in post-treatment. Characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, and electrochemical impedance spectroscopy, reveal that the passive Cu2O film formed on the symmetrical Cu electrodes under AC electrolysis continuously generates Cu+, which is crucial for the reaction. This approach is scalable, environmentally friendly, and holds great potential for industrial applications, offering substantial economic benefits while reducing environmental impact.
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 29
·2310563
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IF 13
Pengfei Li,Shanshan Xue,Lu Sun,Xiaobao Ma,Wenning Liu,Li An,Yichang Liu,Dan Qu,Zaicheng Sun
Carbon dots (CDs) have received considerable attention in many application areas owing to their unique optical properties and potential applications; however, the fluorescent mechanism is an obstacle to their applications. Herein, three-color emissive CDs are prepared from single o -phenylenediamine (oPD) by regulating the ratio of ethanol and dimethylformamide (DMF). Fluorescent mechanism of these CDs is proposed as molecular state fluorescence. Reaction intermediates are identified using liquid chromatrography–mass spectroscopy (LC–MS) and 1 H nuclear magnetic resonance (NMR) spectra. 1H-Benzo[d]imidazole (BI), 2,3-diaminophenazine (DAP), and 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) are proposed to be the fluorophores of blue, green, and red emissive CDs by comparing their optical properties. As per the LC–MS and 1 H-NMR analysis, DHQP with red emission tends to form from DAP and oPD in pure ethanol. By adding DMF, BI formation is enhanced and DHQP formation is suppressed. The prepared CDs exhibit green emission with DAP. When the DMF amount is >50%, BI formation is considerably promoted, resulting in DAP formation being suppressed. BI with blue emission then turns into the fluorophore of CDs. This result provides us an improved understanding of the fluorescent mechanism of oPD-based CDs, which guides us in designing the structure and optical properties of CDs.
研究领域:
材料科学
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光学
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化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 20
·9066-9072
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IF 3.591
Shaoguang Li,Huilin Liu,Xiaoying Zhang,Jiasong Cai,Kunlong Huang,Bing Chen,Liying Huang,Zhen Lin,Xinhua Lin,Hong Yao
A label-free, rapid, and highly sensitive colorimetric assay for the detection of glutathione (GSH) was developed. o-Phenylenediamine (OPD) can be selectively oxidized by Au3+ in phosphate buffer to produce light yellow 2,3-diaminophenazine. After the addition of GSH, the autocatalytic redox reaction between OPD and Au3+ can be effectively inhibited, resulting in a significant decrease in chroma and absorbance intensity. Reduced absorbance intensity can be used for the quantification of GSH. In addition, this method can achieve the discriminative detection of biothiols, such as cysteine and homocysteine. Based on these findings, a simple colorimetric assay was developed for the detection of GSH in the range of 1 nM to 1 mM with a low detection limit of 0.08 nM. More importantly, this procedure is simple, and the whole assay can be accomplished quickly within 15 min. Additionally, the proposed method was successfully used for the determination of GSH in biological fluids, such as serum samples.
研究领域:
分析化学
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生物医学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
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IF 7.183
Chengyu Yang,Weixing Xu,Yang Nan,Yiguang Wang
Solvent-resistant nanofiltration (NF) membranes have numerous application prospects. In this study, a novel solvent-resistant nanofiltration membrane with a double layered polyamide structure was prepared for efficient desalination. The substrate was polyimide crosslinked with m -phenylenediamine (MPD), and the surface layer was polyamide prepared by typical interfacial polymerization. The crosslinking was confirmed by Fourier transform infrared spectroscopy . Investigation of the effects of different reaction conditions on membrane performance showed that the optimal reaction conditions were found to be: 5% aqueous MPD solution with crosslinking time of 10 min and piperazine concentration of 0.1% (m/v). The rejection rate for sodium sulfate and sodium chloride were 99.13% and 97.45%, respectively. The membrane morphologies were studied by scanning electron microscopy and atomic force microscopy . The membrane showed electronegativity in the pH range of 3.0–10.0 and its contact angle was 54.28°, indicating excellent hydrophilicity. After soaking in several solvents for a week, the membrane still had a high rejection rate of more than 90% for Na 2 SO 4 , demonstrating its excellent solvent resistance .
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 17
·期 1
·167
·
IF 2.468
Linfeng Jin,Liyuan Chai,Weichun Yang,Haiying Wang,Liyuan Zhang
Titanium carbides (MXenes) are promising multifunctional materials. However, the negative surface charge and layer-by-layer restacking of MXenes severely restrict their application in the field of anionic pollutants, including in hexavalent chromium (Cr(VI)). Herein, Ti3C2TxMXenes was functionalized through in situ polymerization and intercalation of poly(m-phenylenediamine) (PmPD), then Ti3C2Tx/PmPD composites were obtained. Delightedly, Ti3C2Tx/PmPD composites exhibited positive surface charge, expanded interlayer spacing, and enhanced hydrophobicity. Furthermore, the specific surface area of Ti3C2Tx/PmPD composite was five and 23 times that of Ti3C2Txand PmPD, respectively. These advantages endowed Ti3C2Tx/PmPD composite with an excellent adsorption capacity of Cr(VI) (540.47 mg g−1), which was superior to PmPD (384.73 mg g−1), Ti3C2TxMXene (137.45 mg g−1), and the reported MXene-based adsorbents. The Cr(VI) removal mechanism mainly involved electrostatic adsorption, reduction, and chelation interaction. This study developed a simple functionalization strategy, which would greatly explore the potential of MXenes in the field of anionic pollutants.Keywords:titanium carbides;functionalization;polymerization;hexavalent chromium;adsorption
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）