MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-11
·
IF 6.408
Wang Yue,Zhai Hongguo,Yin Jiaqi,Guo Qi,Zhang Yuhao,Yang Qingqing,Li Falan,Sun Xia,Guo Yemin,Zhang Yanyan
With the development of exonuclease, the exonuclease has been used to construct a variety of aptasensor and to realize the signal amplification. Among them, based on silver nanoparticles (Ag NPs) and exonuclease I (Exo I)-assisted cycle signal amplification strategy, we designed a novel high-sensitivity dual-target electrochemical biosensor to detect Pb 2+ or Hg 2+ in water. In the presence of Hg 2+ , the Hg 2+ was fixed to the aptamer chain by thymine-Hg 2+ -thymine (T-Hg 2+ -T), resulting in the decrease of signal. When Pb 2+ was present, DNA single strand S2 dissociated and was bound to Pb 2+ , which automatically triggered Exo I to selectively cut the single chain from the recognition site to achieve the cyclic amplification of the electrochemical signal. The interaction between aptamer and Exo I was investigated by gel electrophoresis. Under the optimum conditions in the scan range -0.20 to 0.60 V, the biosensor had high sensitivity with a linear range of 100 pg/L to 10.0 mg/L, Pb 2+ or Hg 2+ , and the detection limits were 17.0 pg/L ( R 2 = 0.993) and 12.0 pg/L ( R 2 = 0.993), respectively. The relative standard deviation (RSD) of the sensor was 0.5–2.6%, and the recovery of spiked standard solutions was between 98.3 and 110%. The cycle amplification strategy supported by this enzyme has promising applications in detection of the two metal ions in various fields. Graphical Abstract
研究领域:
分析化学
·
环境科学
·
生物化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 8
·459
·
IF 4.432
Xue-Chun Yang,Song Gao,Sha-Qi Fu,Xuan Yao,Zheng Jiao,Jing-Tai Zhao,Zhi-Jun Zhang,Ling-Li Cheng
Both sodium alginate and polyethyleneimine (PEI) have a good ability to adsorb heavy metal ions. PEI and sodium alginate were used as important precursors to synthesize positively charged carbon nanoparticles (p-CNDs) with hydroxyl and carboxyl, and negatively charged carbon nanoparticles (n-CNDs) with amino, respectively. The carbon nanoparticles (CNDs) aerogel with a large specific surface area and rich functional groups were constructed by self-assembled p-CNDs and n-CNDs via electrostatic attraction for adsorption of heavy metal ions in water. The results show that CNDs aerogel has good adsorption properties for Pb2+(96%), Cu2+(91%), Co2+(86%), Ni2+(82%), and Cd2+(78%). Furthermore, the fluorescence emission intensity of CNDs aerogel will gradually decrease with the increase in the adsorption rate, indicating that it can detect the adsorption process synchronously. In addition, the cytotoxicity test reveals that CNDs have good biocompatibility and will not cause secondary damage to biological cells.Keywords:self-assembled;Pb2+;Cu2+;adsorption
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Siyi Zhang,Kamile Arkin,Yuxin Zheng,Jicheng Ma,Yuyang Bei,Di Liu,Qingkun Shang
In this paper, an environmentally friendly, visible and easy-to-recycle spherical adsorbent (SA@PEI-CDs, SA : sodium alginate, PEI: polyethyleneimine, CDs : carbon dots) has been prepared from functionalized positively charged biomass carbons dots (PEI-CDs) and anionic polyelectrolyte sodium alginate (SA) through electrostatic self-assembly. SA@PEI-CDs can efficiently and preferentially adsorb Pb 2+ . Compared to bare SA, the adsorption capacity of SA@PEI-CDs increased from 206.93 mg/g to 380.39 mg/g (at pH=4), which enhanced 83.82%. It can still maintain 85.67% of the original adsorption capacity after five cycles. The quenching of the blue fluorescence of the adsorbent derived from carbon dots indicates that the adsorption process has reached saturation. The investigation about the adsorption isotherm models, kinetics and thermodynamic parameters reveals that the adsorption process follows Freundlich isotherm model based on chemical adsorption , which is an endothermic spontaneous reaction with an increase in entropy. The possible adsorption mechanism is electrostatic attraction, ion exchange, and together with the coordination of -NH 2 , -OH, -COOH with Pb 2+ . In addition, the extremely easy-to-recycle spherical adsorbent is also used in the multi-layer adsorption and separation of simulated sewage samples in the water purifier model. For simulated water samples whose concentration of five/three types of heavy metal ions exceeds 100 times the standard, after using adsorbent SA@PEI-CDs for two or three consecutive adsorptions, the content of heavy metals decreases rapidly, which is far below the limit value of high-quality water. The Pb 2+ ion concentration decreased from 1.0 mg/L to 0.002540 mg/L and 0.003611 mg/L, respectively.
研究领域:
材料科学
·
环境科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiaohong Liu,Libo Li,Fang Li,Wanlin Zhao,Lijun Luo,Xiaoya Bi,Xia Li,Tianyan You
Signal amplification provides an effective way to improve detection performance. Herein, an ultrasensitive electrochemiluminescence (ECL) aptasensor for Pb 2+ detection was developed based on a dual signal-amplification strategy of the abscission of a quencher and the generation of a G-quadruplex by one-step and simultaneous way. Nitrogen-doped carbon quantum dots linked with complementary DNA (cDNA-NCQDs) at the sensing interface was applied as the quencher of a tris(4,4′-dicarboxylic acid-2,2′-bipyridyl)ruthenium(II) (Ru(dcbpy) 3 2+ )/tripropylamine system to minimize the ECL signal due to the intermolecular hydrogen bond-induced energy-transfer process. Upon the addition of Pb 2+ , its specific binding with the aptamer triggered the abscission of cDNA-NCQDs, accompanied by the formation of G-quadruplex on the surface of the electrode, both of which amplified the intensity of the light emission. The ECL amplification efficiency induced by the above two mechanisms (78.6%) was valuably greater than that of their sum value (69.3%). This synergistic effect resulted in high detection sensitivity of the ECL aptasensor, which allowed to thereby obtain Pb 2+ measurements in the range of 1 fM - 10 nM with an ultra-low detection limit of 0.19 fM. The Pb 2+ -mediated synergistic signal-amplification ECL strategy can provide a new approach for integrating various amplification strategies.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiumei Liu,Ying You,Tingting Zhang,Mengting Li,Ziyu Qin,Jiang Wang,Xueqiong Yin
Two sodium alginate-based Pb 2+ -imprinted thermosensitive hydrogels (SPIT (without ɛ-PL) and SPPIT (with ɛ-PL)) were synthesized, with sodium alginate and ɛ-polylysine (ɛ-PL) as the matrix, N-isopropylacrylamide as the monomer. Characterization with differential scanning calorimeter, Fourier transform infrared spectroscopy , thermogravimetric analyzer, scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy confirmed the aimed structure of the hydrogels. The adsorption capacity of SPIT and SPPIT for Pb 2+ was 98.64 mg/g and 153.49 mg/g, respectively. Washing the Pb 2+ -loaded adsorbent with 10 °C deionized water, SPIT and SPPIT achieved a desorption efficiency of 94.59 % and 97.51 %, respectively. After 10 cycles of adsorption-desorption process, the adsorption capacity and desorption efficiency remained at about 80–88 % of the original ones, expressing excellent reusability. In a mixture containing eight metal ions (Pb 2+ , Cu 2+ , Mg 2+ , Ca 2+ , Cd 2+ , Na + , K + , Fe 3+ ), the adsorption capacity of SPIT to Pb 2+ was 92.49 mg/g, and that of SPPIT was 102.49 mg/g, much higher than that to the other ions (1.50–11.38 mg/g on SPIT, 9.48–27.45 mg/g on SPPIT), showing excellent adsorption selectivity. The introduction of ɛ-PL enhanced the adsorption capacity, antibacterial ability and stability of the hydrogel, ensuring better application potential in real wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Computational and Theoretical Nanoscience
·
2017
·Vol. 14
·期 7
·3203-3208
·
IF 0
Tang Zhuxing,Lu Guangming,Ai Meimei
With hydrothermal method synthesized Fe3O4@PDA@MOF-199 magnetic nano-materials and the materials were characterized through scanning electron microscopy, energy spectrum diagram, fourier infrared and vibrating sample magnetometer. Metal organic framework materials
has a large surface area and a good adsorption for heavy metal ions, and the magnetic nanomaterial was separated easily via a magnet from a solution. The optimal condition: material consumption of 5 mg, shock time for 1 h, pH = 5 and under the condition saturated adsorption amount of Fe3O4@PDA@MOF-199
magnetic nanomaterials to Pb2+ was 539 mg g−1. And using 0.1 mol L−1 EDTA solution as eluent to desorb the saturated Fe3O4@PDA@MOF-199 magnetic nanomaterials, the elution rate can reach 89.44%. In this paper, Fe3O4@PDA@MOF-199
magnetic nanomaterials were used to absord Pb2+ in actual sample.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Processes
·
2022
·Vol. 10
·期 7
·1359
·
IF 3.352
Xiaoyu Huo,Chao Jia,Shanshan Shi,Tao Teng,Shaojie Zhou,Mingda Hua,Xiangdong Zhu,Shicheng Zhang,Qunjie Xu
Potassium thiocyanate (KSCN), a highly efficient “three birds with one stone” activator, might work with inorganic activators to produce excellent N/S co-doped porous carbon (NSC) materials for environmental remediation. However, the effects of inorganic activators on cooperative activation are unclear. As a result, the influence of inorganic activators on the synthesis of NSC materials was investigated further. This study shows that the surface areas of the NSC materials acquired through cooperative activation by potassium salts (KOH or K2CO3) were considerably higher than those acquired through KSCN activation alone (1403 m2/g). Furthermore, KSCN could cooperate with K2CO3to prepare samples with excellent specific surface area (2900 m2/g) or N/S content. The as-prepared NSC materials demonstrated higher adsorption capability for chloramphenicol (833 mg/g) and Pb2+(303 mg/g) (pore fitting, complexation). The research provides critical insights into the one-step synthesis of NSC materials with a vast application potential.Keywords:N/S co-doping;porous carbon;chloramphenicol adsorption;Pb2+removal
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123736
·
IF 7.5
Hao Wang,Huifeng Deng,Shenghong Lai,Jiahui Li,Menghong Xie,Jiazhen Wei,Guihua Ruan,Yipeng Huang
In recent years, lead ion (Pb 2+ ) pollution control technologies have continued to advance. Among them, the adsorption method has shown promising application prospects. However, existing adsorption methods focus solely on Pb 2+ removal while neglecting the subsequent transformation and functionalization of the recovered Pb 2+ . To address these issues, thiol-functionalized covalent organic frameworks (COFs) were synthesized for recovery of Pb 2+ and confined conversion of Pb 2+ to CsPbBr 3 nanocrystals (NCs), an optoelectronic material. The effects of morphologies and surface chemistry of COFs on the adsorption efficiency for Pb 2+ were studied. The morphology tuning of COFs from spherical shape to flower shape with a myriad of humps on the surface boosted the adsorption efficiency for Pb 2+ from 25% to 85%. After thiol modification by 1,2-ethanedithiol, the adsorption efficiency of COFs for Pb 2+ increased by nearly 10-fold. The maximum adsorption capacity of thiol-functionalized COFs for Pb 2+ was 54.3 mg·g −1 . The adsorption isotherm was best described by the Langmuir model. Utilizing the mesopore-confined effect of COFs, the enriched Pb 2+ were converted into CsPbBr 3 NCs. The CsPbBr 3 NCs confined in COFs exhibited excellent stability and could generate singlet oxygen ( 1 O 2 ) under the irradiation by xenon lamp, revealing their potential applications in photocatalysis, bacteriostasis, light emitting diode and sensing. This work provides a prototype for both the removal and recycling of polluted Pb 2+ .
✓ 已验证
DOI
高影响因子
SENSORS
·
2021
·Vol. 21
·期 5
·1663
·
IF 3.576
Lei Zhang,Zhengying Wei,Pengcheng Liu,Haoran Wei,Denglong Ma
Carbon-based nanomaterials with carboxylation or chemical modification are widely used as electron-ion exchangers of solid electrodes. For reducing the complexity and dangerousness of the intermediate layer preparation, different original carbon-based nanomaterials are dispersed in deionized water. They are applied in the fabrication of Pb2+-selective electrodes. Because the contact angle of graphene reached 132.5°, the Pb2+-selective electrode of graphene used as an electron-ion exchanger showed excellent performance with a low detection limit of 3.4 × 10−8M and a fast average response time of 42.6 s. The Nernstian response slope could reach 26.8 mV/decade, and the lifetime lasted for a month. Therefore, graphene suspension without any treatment can be used as the intermediate layer of solid-state electrodes, providing a reference for the preparation of other ion-selective electrodes.Keywords:Pb2+selective electrode;graphene;multi-walled carbon nanotube;fullerene
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Zhe Wang,Keyan Tan,Jingyi Cai,Shitian Hou,Yue Wang,Peng Jiang,Minghui Liang
The removal of trace heavy metals from water is of great importance for human’s health, and it is highly desirable to develop efficient adsorption material to reach this target. SiO 2 encapsulated natural zeolite (SiEZ) was prepared as the adsorption material, which was characterized with TEM , SEM, XRD and BET. The adsorption capacitance of Pb 2+ , Cd 2+ , Cu 2+ , Zn 2+ , and Mn 2+ over SiEZ are 186, 10.3, 12.3, 9.0, and 4.2 mg g −1 , respectively. The highest removal percentages of Pb 2+ , Cd 2+ , Cu 2+ , Zn 2+ , and Mn 2+ over SiEZ can reach 99%, 98%, 98%, 98%, and 97%, respectively, at the initial heavy metals’ concentrations of 10 ppm. SiEZ is highly selective for the removal of Pb 2+ when five metals co-exist. SiEZ can be recycled for heavy metal removal ; at the first cycle, the removal percentage of Pb 2+ can reach 99%; after SiEZ is repeatedly used for four times, the removal percentage of Pb 2+ can still remain 83.8%. More importantly, elemental distribution measurement technology reveals that Pb 2+ and Zn 2+ in SiEZ can move from SiO 2 to NZ, which is helpful to understand the heavy metal transport in the composite.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2022
·
IF 2.267
Hongjing Sun,Zheng Liu,Zhihong Li,Xinyue Ma,Zixuan Duan,Chunyan Sun
A simple and label-free fluorescent sensor based upon a specific DNAzyme (8–17 DNAzyme) and thiazole orange (TO) for monitoring Pb2+ in water samples was described. The 8–17 DNAzyme was formed by an enzyme strand (17E) and a partially complementary substrate strand (17DS). Thiazole orange, the DNA intercalator, was nonfluorescent in aqueous solution while it intercalates into the 8–17 DNAzyme with a duplex structure resulting in strong fluorescence. In the presence of Pb2+, the 17E was activated and cleaved the 17DS into two at the ribonucleoside adenosine (rA) position, leading to the disruption of the duplex structure. This Pb2+-induced conformational change led to the quenching of the fluorescence of thiazole orange, thus forming the basis for the label-free biosensor. Under the optimized conditions, the developed protocol exhibited sensitive determination of Pb2+ with a detection limit of 0.73 nM and a linear range from 10 to 150 nM. The label-free fluorescent approach exhibited excellent selectivity, strong selectivity, and satisfactory analysis of a drinking water standard reference material and spiked river and tap water samples. Taking the advantage of the structure-switching 8–17 DNAzyme and the fluorescent intercalator of nucleic acids, this label-free sensor provides a new approach for routine screening of heavy metals based upon the DNAzyme.
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Zhiwei Lu,Wanlin Dai,Baichen Liu,Guangquan Mo,Junjun Zhang,Jiaping Ye,Jianshan Ye
In this work, we report a facile and green strategy for one pot and in-situ synthesis of a dandelion-like conductive polyaniline coated gold nanoparticle nanocomposites (Au@PANI). The Au@PANI was characterized by SEM, TEM, XRD, TGA, FTIR, UV–vis and conductivity measurement, respectively. Newly-designed Au@PANI materials possessed a significantly high conductivity and strong adsorption capability. Thus, the Au@PANI modified glassy carbon electrode (GCE) was utilized for construct a novel electrochemical sensor for the simultaneous assay of Pb 2+ and Cu 2+ using square wave anodic stripping voltammetry (SWASV). Under the optimized conditions, an excellent electrochemical response in the simultaneous of Pb 2+ and Cu 2+ with detection limit of 0.003 and 0.008 μM (S/N = 3), respectively. Moreover, the prepared sensors realized an excellent reproducibility, repeatability and long term stability, as well as reliable practical assays in real water samples. Besides, the possible formation mechanism and sensing mechanism of Au@PANI nanocomposites have been discussed in detail. We believe this study provides a novel method of fabrication of noble metal nanoparticles decorated conducting polymer materials for the electrochemical sensing applications.
研究领域:
材料科学
·
分析化学
✓ 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）