Analytical Methods
·
2019
·Vol. 12
·期 4
·552-556
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IF 2.378
Zhi-Qiang Zhou,Li-Yun Yang,Yuan-Ping Liao,Hui-Yan Wu,Xiao-Hui Zhou,Shan Huang,Yi Liu,Qi Xiao
A highly selective and sensitive nanoprobe with fluorescence turn-on sensing properties for recognizing Cd2+ was developed through replacing Mn2+ near the surface of Mn:ZnSe quantum dots (QDs). The similar ionic radii of Cd2+ and Zn2+ make the replacement of superficial Zn2+ by Cd2+ possible, followed by the replacement of external Mn2+ by Cd2+. Thus, this fluorescence turn-on strategy possesses great selectivity for the determination of Cd2+. Based on this strategy, the limit of detection (LOD) for Cd2+ is 18 nM, which is superior to the LOD of most reported fluorescent nanomaterial-based probes.
研究领域:
材料科学
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环境科学
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分析化学
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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
✓ 已验证
产品关联
DOI
PubMed
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
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材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS
·
2025
·
IF 3.3
Wu Mengyao,Wang Haiou,Wang Wenxuan,Ren Xiaoyu,Zhang Juming
Hydroponic experiments and computational simulations were conducted to investigate the changes in the gene expression, structure, and binding mode of the rice transporter protein OsTIL to OPEs by the presence of Cd 2+ and Zn 2+ . OPEs and Zn 2+ were observed to promote seedling growth and OPEs alleviated the suppressive effect of Cd 2+ on seedlings. Usually, Cd 2+ and Zn 2+ inhibited the accumulations of OPEs in plants accompanied by the decrease of RCF (root concentration factor) and TF (transport coefficient). In particular, Zn 2+ promoted TDCPP accumulation only in roots accompanied by the increase of RCF and the decrease of TF. Furthermore, Cd 2+ and Zn 2+ affected the gene expressions of OPEs transporter-OsTIL response in the accumulation of OPEs in both single and compound pollution. After molecular dynamics simulation analysis, RMSD of the protein backbone, binding pocket, and ligand only in TDCPP-OsTIL complex also were significantly affected by two metal ions. Furthermore, two metal ions can press the interaction of OPEs and OsTIL by reducing the stability of protein structure and the numbers of HB (hydrogen bonds) and enlarging the pocket. However, Zn 2+ extra supports an enlarged entrance for TDCPP, which could facilitate the entry of the coordination complex of Zn 2+ with TDCPP into the pocket and improve TDCPP capacity of OsTIL.
研究领域:
植物学
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环境科学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yongfeng Liu,Jiangtao Zhang,Xiaojun Du,Yang Cao,Youyi Sun
Here, the Ag nanoparticles decorated graphene (AgNP@GNs) were fabricated by combing liquid phase exfoliation with in-situ solvent reduction method. Furthermore, the electrochemical sensitivity toward Cd 2+ and Pb 2+ ions was also investigated in detail. This AgNP@GNs presented the excellent electrical properties (2.5×10 4 S/m), meanwhile showed high electrochemical detection ability toward Cd 2+ and Pb 2+ . The sensitivity of AgNP@GNs toward Pb 2+ and Cd 2+ was ca. 15.2μA/μM (or 1246.4μA/μg L -1 ) and 0.09μA/μM (4.32μA/μg L -1 ), respectively. The AgNP@GNs was also evaluated to electrochemical detection of Cd 2+ and Pb 2+ in real water, in which the recoveries (96~124%) were obtained. The work does not only provide a facile method to synthesize AgNP@GNs with good dispersion, but also showed good electrical properties for various applications.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Toxics
·
2022
·Vol. 10
·期 7
·367
·
IF 4.472
Dengpeng Wang,Feng Gao,Xianran Wang,Xiaomei Ning,Kaituo Wang,Xinpeng Wang,Yuezhou Wei,Toyohisa Fujita
The detection of heavy metals in aqueous solutions has always attracted much attention from all over the world. A fluorescent probe of CdSe/CdS core-shell quantum dots (QDs) was designed to detect trace Cd2+in aqueous solutions using the OFF–ON mode rapidly and efficiently, likely based on adsorption and desorption reactions between ethylenediaminetetraacetic acid disodium salt (EDTA) and CdSe/CdS QDs. In the OFF mode, the optical shielding function of EDTA results in fluorescence quenching owing to the strong adsorption ability of EDTA with Cd2+on the sites of CdSe/CdS QDs surface. In the ON mode, the introduction of Cd2+promotes the desorption of EDTA from the EDTA-CdSe/CdS QDs and restores the fluorescence intensity. There were two linear response ranges which were 0.1–20 µmol/L and 20–90 µmol/L for the EDTA-CdSe/CdS system to detect Cd2+. The detection limit was 6 nmol/L, and the standard deviation was below 4% for the detection of Cd2+concentration in tap water.Keywords:QDs;fluorescence quenching;fluorescence restore;Cd2+detection;adsorption;desorption
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
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2023
·Vol. 18
·期 5
·e2962
·
IF 1.8
Tianming Yang,Xin Xin,Jin-Chi Jiang,Zhenhao Yin,Long-Yue Meng
The sensitive detection of heavy metal ions with high toxicity and mobility is extremely important for environmental monitoring. In this study, nitrogen-doped biochar (N-BC) was synthesized using waste mushroom bran as a raw material, and nitrogen atoms were successfully doped onto the surface of the biochar via a facile process using an activation-carbonation strategy. The functional groups on the surface of the biochar were enriched via doping, and the roughness of the biochar surface was significantly improved. Experimental results showed that N-BC was an efficient sensing material for electroanalysis; therefore, it was used to construct a novel electrochemical sensing platform. The electrochemical response of the biochar-modified working electrodes was effectively improved for the detection of heavy metals. Under optimized deposition potential, enrichment time, and pH, the N-BC-based sensing platform could detect Pb 2+ and Cd 2+ separately as well as simultaneously, indicating its significant potential for electrochemical sensing.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Yiru Zhu,Shuwen Zhao,Bin Zhou,Hao Zhu,Youfa Wang
In this work, we report a phenomenon that upconversion emission intensity of Er3+ was enhanced by cadmium. Cd2+ was taken with 0, 3, 10, 20, 30, and 40 mol % as a new dopant to codope LiY0.78Yb0.20Er0.02F4, meanwhile the doping effects on the crystal structure, morphology, and upconversion fluorescence emission are investigated by XRD, Rietveld refinement, TEM, and upconversion spectroscopy analysis methods in detail. The green upconversion emission intensity was enhanced, and the maximum emission intensities were enhanced to twice when 10 mol % Cd2+ was codoped into tetragonal LiYF4, while its decay lifetime was reduced. Additionally, we further designed the synthesis of the homogeneous LiYF4:20%Yb,2%Er,10%Cd@LiYF4 of which the emission intensity is 11 times higher than that of the Cd2+-free nanocrystals, meanwhile an intriguing morphology of core–shell nanocrystals was obtained. This investigation may be useful for the design and improvement of upconversion materials for fulfilling the prerequisite of the practical application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 12
·1807-1815
·
IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Xiangyang Zhao,Lingling Wang,Yawei Wang,Xingyu Zhang,Rong Fang,Yue Zhou,Rui Guo,Xintong Zhang,Yichun Liu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are considered a promising new type of film cell, due to their rich elemental reservation and excellent photovoltaic performance. However, the deleterious defects at the heterojunction interface severely hinder charge transport, separation, and extraction, significantly limiting the photovoltaic performance of CZTSSe solar cells. In this study, a simple method involving the incorporation of Cd 2+ and Ag + dual-ion at the heterojunction interface was proposed to reduce interfacial defects. The results showed that Cd 2+ and Ag + dual-ion interface deposition effectively reduced the [2Cu zn + Sn zn ] harmful defects near the heterojunction interface and subsequently reduced the number of recombination centers in the interface. This led to improved carrier recombination at the interface. Meanwhile, the devices achieved a wider depletion width, which was more favorable for carrier collection. Ultimately, the conversion efficiency increased by 32.81 %. This simple interface dual-ion deposition strategy offers a promising strategy for further enhancing the efficiency of CZTSSe cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Dai,Peipei Wei,Yujuan Wang
The addition of heteroatoms changes the structure and optical properties of carbon quantum dots (CQDs). In the paper, nitrogen (N)-doped CQDs are prepared via one-step hydrothermal method from Auricularia auricular and ethylenediamine. Transmission Electron Microscope (TEM) analysis reveals that the average size of carbon quantum dots is 5±2 nm, whereas the chemical study shows the existence of C-N bond. The produced N-doped CQDs have fluorescence quantum yields of 28.4%. Moreover, the prepared CQDs showed high sensitivity and accuracy and had a good proportional band of 0-50 μM for detection Hg 2+ (R 2 =0.9919) and Cd 2+ (R 2 =0.9964). The low detection limits were 77.21 nM and 101.55 nM for Hg 2+ and Cd 2+ , respectively. The CQDs was triumphantly used to track metal ions in environmental samples. So, it was a promising method for environmental pollutant detection.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
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