CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lingxiao Li,Xueyan Liu,Jianhong Xu,Chengyou Kan
A novel polymerizable monomer containing carbon-carbon double bond and disulfide bond, 2-(((2-(pyridin-2-yldisulfanyl)ethoxy)carbonyl)amino) ethyl acrylate (PDSECAE), was first designed and synthesized, and then used to prepare thiol-containing monodisperse polymer microspheres with different sizes from 20 μm to 500 μm by means of microfluidic technique, UV-induced polymerization and dithiothreitol reduction in sequence. The chemical structures of PDSECAE and the microspheres were confirmed by NMR, FTIR and RAMAN, and the thiol content was determined by UV–vis spectrophotometer. Having the largest specific surface area, microspheres of 20.0 μm in diameter were utilized in adsorption of Pb 2+ in water, and the maximum adsorption capacity reached 104.4 mg/g at pH 6.0 and 25 °C. After the adsorbed Pb 2+ was removed by ethylenediaminetetraacetic acid disodium salt, the regenerated thiol-containing microspheres could be reused and their adsorption capacity still remained 85% of its initial value after 5 recycles. Efficient adsorption performance and easy reusability make the thiol-containing polymer microspheres show promising applications to adsorption of heavy metal ions.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lijing Xu,Tian Bai,Xinzhun Yi,Kongyin Zhao,Wenxiong Shi,Fengying Dai,Junfu Wei,Jie Wang,Ce Shi
Polypropylene grafted calcium alginate with mesoporous silica (PP-g-CaAlg@SiO 2 ) for adsorbing Bisphenol A (BPA) and Pb 2+ was prepared by calcium chloride (CaCl 2 ) crosslinking and hydrochloric acid solution treatment. The PP-g-CaAlg@SiO 2 was characterized by SEM, TEM , BET, XRD, FTIR and TG. PP-g-CaAlg@SiO 2 exhibited excellent adsorption capacity for BPA and Pb 2+ , because the formation of reticulated nanorod structure increased its specific surface area. Subsequently, the adsorption behaviours of BPA and Pb 2+ , including adsorption isotherms and adsorption kinetics , were investigated. Afterward, isothermal titration calorimetry (ITC) and molecular dynamics (MD) simulation were performed to explore the adsorption mechanism. The results indicated that hydrogen bonding played the leading role in the adsorption of BPA, while the bonding of Pb 2+ to carboxyl group binding sites was the focus of Pb 2+ adsorption. In addition, the adsorption capacity of PP-g-CaAlg@SiO 2 was stable over 10 cycles.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2025
·
IF 4.3
Mengfan Duan,Zhuo Wang,Weiping Zhu,Yufang Xu,Xuhong Qian
The recent discovery of heavy metal pollution in Chinese herbs has raised serious concerns for both human health and the environment. Researchers’ attention has been drawn to the toxicity and bioaccumulation of heavy metal ions. In this paper, a new technical method for preparing ethylene glycol-bis (β-aminoethyl ether)-N,N,N′,N′-tetra acetic acid (EGTA)-functionalized cotton fiber was innovatively proposed, and on this basis, heavy metal ions were successfully removed. First, the surface of cotton fiber (FC) was modified with amino group by reactive dye dyeing method to obtain FN (amino-modified cotton fiber). Subsequently, EGTA anhydride was grafted onto FN to obtain FNE (EGTA-modified cotton fiber). The interaction between materials and metal ions was systematically studied by isothermal titration calorimetry and other methods. The results showed that the adsorption capacity of FNE for Cd2+, Pb2+, and Hg2+ could reach 18.87, 25.84, and 6.69 mg/g, respectively. More importantly, FNE can be reused at least five times in an acidic environment. Furthermore, it is possible to efficiently eliminate heavy metal ions from Chinese herb extracts without compromising the active ingredients. This research provides a brand-new idea and method for solving the problem of removing heavy metal ions from Chinese herb extracts.
研究领域:
环境科学
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材料科学
·
生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 12
·12172-12178
·
IF 1.338
Guo Yajin,Liu Zheng,Han Guo-Cheng,Li Wei,Hu Yajun,Chen Zhencheng
CdTe quantum dots (QDs) modified with 4-aminoantipyrine shrink 2,5-dihydroxylbenzadehyde Schiff base were synthesized and characterized using infrared spectrum (FTIR), ultraviolet-visible spectrum (UV-vis), photoluminescence (PL), TEM and thermal gravimetric analysis (TGA). The as-prepared
fluorescent switch was subjected to the determination of Pb2+ by the fluorescence resonance energy transfer (FRET). There were two successive linear relationships between the fluorescent intensity and Pb2+ concentration, in the concentration range of 0.01–100 μmol/L
and 100–10000 μmol/L with r = 0.9994 and r = 0.9996, respectively, and accompanying with 3.0 nmol/L limit of detection. The proposed method was successfully applied to detect Pb2+ in industrial sewage samples and the results showed that the relative
standard deviation was less than 4.1%, with a recovery of 96.7–102%.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·63-68
·
IF 2.138
Jiao Wang,Xuerong Chen,Kangbing Wu,Miao Zhang,Wensheng Huang
Graphene nanosheets (GS) were prepared via ultrasonic exfoliation, and used to modify glass carbon electrode (GCE). Compared with GCE, the GS-modified GCE (GS/GCE) greatly increased the anodic stripping peak currents of Cd 2+ and Pb 2+ . Moreover, the response signals of Cd 2+ and Pb 2+ on GS/GCE further enhanced remarkably in the presence of Bi 3+ . Based on the synergistic enhancement effects of GS and Bi 3+ , a novel electrochemical sensor was developed for Cd 2+ and Pb 2+ . The detection limits were 0.35 and 0.045 μg L −1 for Cd 2+ and Pb 2+ . It was used in food sample analysis, and the accuracy was tested by ICP-MS.
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
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yanli Qi,Xiaolong Chen,Danqun Huo,Huan Liu,Mei Yang,Changjun Hou
Cd 2+ and Pb 2+ are two typical metallic pollutants in food. Therefore, it is of great significance to establish a method which can simultaneously detect them. Here, an electrochemical sensor was established to simultaneously detect Cd 2+ and Pb 2+ in food samples based on sensing electrode prepared by conductive carbon paper, rGO and CoZn·MOF (CP-rGO-CoZn·MOF). Under the optimized conditions, the proposed electrochemical sensor achieves simultaneous detection of Cd 2+ and Pb 2+ low to 0.565 nM (Cd 2+ ) and 0.588 nM (Pb 2+ ), respectively. Further selective experiments and repetitive experiments perform well. Spiked experiments find that the recovery rates of Cd 2+ and Pb 2+ in food samples are between 97.5% to 105.9% and 94.3%–109.6%, indicating the established electrochemical sensor owns a good response to the targets. Besides, relative standard deviations (RSD) of them are no more than 5.817%, showing its potential in practical applications.
研究领域:
分析化学
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食品安全
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环境科学
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产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Xin Feng Zhu,Jue Feng,Jun Wu Zhu,Bin Li,Qin Xu
Simultaneous determination of Pb2+ and Co2+ without separation has been successfully achieved by a bicolor quantumn dots mixture. This method takes advantage of the different degrees of the fluorescence quenching effects of Pb2+ and Co2+ to the bio-color quantum dots. Chemometrical approaches were applied to assist the discrimination and detection process. The construction of the multivariate calibration models, based on partial least squares (PLS), orthogonal projections to latent structures least squares (O-PLS) and kenel based orthogonal projections to latent structures (K-OPLS), allowed the simultaneous determination of Pb2+ (in the concentration range of 0-120 mM) and Co2+ (0-300 mM). The optimal number of factors in PLS and the optimal number of orthogonal components in O-PLS and K-OPLS were carefully selected. A comparison of prediction performances between these results was performed by relative prediction errors, square of the correlation coefficient and root mean squares error of prediction.
研究领域:
分析化学
·
生物医学工程
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DOI
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Cao Yang,Zhang Yong,Wei Wei,Wang Chen,Zhao Xiaoyu,Chen Xudan,Lu Zhenhao
Organic–inorganic metal halides have recently garnered significant interest owing to their excellent photoluminescence performance and high stability. Therefore, a synthetic procedure was designed here to obtain (PPZ)ZnBr 4 (PPZ = 1-phenylpiperazine) nanocrystals (NCs) incorporating Pb 2+ and Sn 2+ ions, obtaining blue and orange light emitters, respectively. Photoluminescence quantum yields of blue and orange emissions were up to 43.2% and 29.9%, respectively, under 365-nm excitation. The prepared NCs also demonstrated long-term stability and humidity resistance. This study not only provided a deep comprehension of low-dimensional perovskites, but also established an avenue for the strategic design of high-performance light-emitting perovskites.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Zhen Zhang,Shuran He,Yulong Zhang,Kun Zhang,Jinjin Wang,Ran Jing,Xingjian Yang,Zheng Hu,Xiaojing Lin,Yongtao Li
In the present study, the competitive adsorption of Cu 2+ , Pb 2+ , and Cd 2+ by a novel natural adsorbent (i.e., argillaceous limestone) modified with chitosan (C-AL) was investigated. The results demonstrated that both intraparticle diffusion and chemisorption marked significant contributions to the Cu 2+ adsorption process by both raw argillaceous limestone (R-AL) and C-AL in mono-metal adsorption systems. Antagonism was found to be the predominant competitive effect for Cu 2+ , Pb 2+ and Cd 2+ adsorptions by C-AL in the multi-metal adsorption system. The three-dimensional simulation and FTIR analysis revealed that the presence of Cu 2+ suppressed Pb 2+ and Cd 2+ adsorptions, while the effect of Cd 2+ on Cu 2+ and Pb 2+ adsorptions was insignificant. The spectroscopic analyses evidenced that amide groups in C-AL played a crucial role in metal adsorption. The preferential adsorptions of Pb 2+ > Cu 2+ > Cd 2+ were likely due to the different affinities of the metals to the lone pair of electrons on the N atom from the amide groups and/or the O atoms from the –OH and -COO - groups on C-AL. The interactions between C-AL and metal ions and between various metal species influenced their competitive adsorption behaviors. C-AL exhibited a superior metal adsorption capacity in comparison with that the capacities of other natural adsorbents reported during the last decade, suggesting its potential practical applications.
研究领域:
环境科学
·
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-11
·
IF 2.8
Ni Yafei,Li Haimin,Li Ming,Liu Xingchong,Wang Hanyu,Lei Yue,Liu Shuqian,Tang Yanling
Perovskite solar cells (PSCs) have received extensive attention due to their excellent photovoltaic properties. However, existence of defects, such as Pb 2+ and I − vacancies, restricts its further improvement of power conversion efficiency (PCE) and affects the stability of PSCs devices. In this study, glycine methyl ester hydrochloride (GMEH) was introduced as interface modification material. As Lewis base, GMEH formed a chemical bonding of Pb–O with perovskite to decrease uncoordinated Pb 2+ defects, thus transfer of charge carriers was obviously facilitated, indicating that status of Pb 2+ in perovskite structure is one of key factors for carrier transportation. Meanwhile, amino group in GMEH combined with iodide to form hydrogen bond, thereby stabilized perovskite structure and decreased ion migration. Eventually, a champion efficiency of 21.94% was obtained with promoted short-circuit current ( J SC ) and fill factor (FF). Meanwhile, the stability of PSCs was significantly improved. The modified PSCs can maintain 90% of the initial efficiency after storing in a nitrogen filled glove box for 1700 h, while the control one can only maintain 55%. And the stability of the modified device in humid air was also greatly improved.
研究领域:
材料科学
·
光伏技术
·
化学工程
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Xuanxuan An,Qin Tan,Shuang Pan,Hui Liu,Xiaoli Hu
A “turn-on” fluorescent probe based on amino-functionalized metal-organic frameworks (MOF-5-NH 2 ) is developed for the detection of Cu 2+ , Pb 2+ and pyrophosphate (P 2 O 7 4− , PPi). The fluorescence emission of fluorescent materials obtained by one-step synthesis is attributed to organic ligands. Cu 2+ and Pb 2+ coordinate with the amino group on the surface of the MOF-5-NH 2 , which is ascribed to the host-guest electron transfer between analyte and probe, giving rise to the fluorescence quenching . After adding PPi, the intense affinity between Cu 2+ and PPi remove Cu 2+ from the MOF-5-NH 2 , blocking of the electron transfer process, and the fluorescence can be recovered. The limit of detection is 0.057, 0.25 and 0.32 μmol L −1 for the detection of Cu 2+ , Pb 2+ and PPi, respectively. This turn-on mode based fluorescent probe shows preferable sensitivity and specificity to detect Cu 2+ , Pb 2+ and PPi. These results demonstrate that the fluorescent MOF-5-NH 2 as a sensing platform displays remarkably performance.
研究领域:
分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Chuanyu Yang,Peitong Yu,Ying Li,Junyang Wang,Xinyue Ma,Ni Liu,Ting Lv,Hongru Zheng,Han Wu,Hongxia Li,Chunyan Sun
Lead contamination has posed a potential threat to the environment and food safety, arousing extensive concern. In this work, we fabricated a novel fluorescent sensing platform based on zeolitic imidazolate framework-8 (ZIF-8) and DNAzyme for monitoring Pb2+ in water and fish samples. ZIF-8 was proposed as a fluorescence quencher with the advantages of simple synthesis, low cost, and high quenching efficiency. The Pb2+-dependent GR5 DNAzyme containing the large ssDNA loop can be adsorbed onto ZIF-8 accompanied by fluorescence quenching. Upon binding with Pb2+, GR5 DNAzyme was activated and cleaved, leading to the release of FAM-labeled 5-base ssDNA, which restored the fluorescence. The “turn-on” assay can detect Pb2+ through the one-pot procedure in the range of 0.01–10.0 nM with a detection limit of 7.1 pM. The platform is promising for on-site monitoring of Pb2+ owing to the excellent performance of high sensitivity, low background, strong anti-interference ability, and simple operation.
研究领域:
分析化学
·
环境科学
·
生物技术
✓ 已验证
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）