APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Zhaohong Su,Jiaqi Wang,Shiyu Hu,Yongbing Cheng,Yuan Yang,Shumo Zhou,Min Chen,Qinyi Cao,Songbai Zhang,Lixia Yang,Zhonghua Liu,Xinman Tu
Surface engineering is an indispensable basic means to improve the properties of carbon nanomaterials and expand their application fields. Herein, tea residue was used as raw material to produce nano-biochar (NBC) by thermal decomposition method. Then the NBC was reshaped in situ on electrode surface to obtain electroreduced NBC (ErNBC) by cyclic voltammetry. After related material characterization, it is found that the properties of NBC are ideally reshaped after in situ electrochemical reduction, the size of NBC is reduced, the content of O element is increased, the hydrophilicity of NBC is enhanced, and the conductivity of NBC is improved. A model was constructed synchronously, and theoretical calculations were conducted to verify the changes in the material’s energy gap. Meanwhile, utilizing the structural properties of ErNBC, we develop an electrochemical sensor combined with machine learning for selective detection of Pb 2+ in actual water samples with a satisfactory recovery rate.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xiuxiu Wu,Mengyuan Huang,Tai Ye,Long Bai,Rui Zhao,Ya Wang,Liling Hao,Min Yuan,Fei Xu
Aptamer conformations are susceptible to environmental conditions, which makes it difficult to achieve stable targets detection in complex environments with aptasensors. Imprinting strategy was proposed to immobilize the specific conformation of aptamers, aiming to enhance their recognition anti-interference. However, it is mechanistically unclear how the imprinted polymers affect aptamers' recognition, which limits application of the strategy. Herein, MD simulation was applied to explore the structural reason why nanogel imprinting improves binding affinity and selectivity of T30695 aptamer to Pb 2+ observed experimentally. Results show the imprinted polymers stabilize the domain-limited T30695 by noncovalent interactions. The coating process undergoes three evolution stages, finally achieving a polymer-aptamer-polymer sandwich-shaped conformation. Notably, it was found the polymers provide additional non-specific binding of Pb 2+ at acylamine group of acrylamide monomers, which accounts for the improved binding affinity with association constant K a 2.5 times larger. More importantly, imprinting enhances selectivity of aptamer to Pb 2+ by changing coordination mode of interfering ions (Ca 2+ , K + , Mg 2+ , NH 4 + and Cu 2+ ), which significantly destroys G-quadruplex conformation and thus its binding ability. This work revealed mechanistic effects of imprinting strategy on aptamers recognition at molecular level, which can guide rational design of high-performance aptamer-based biosensors applied in various detection areas.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Yanzi Li,Rui Zhao,Shen Chao,Bolun Sun,Ce Wang,Xiang Li
Polydopamine (PDA) and MnO 2 have been proven to be promising adsorbents to capture Pb 2+ from wastewater. In this study, MnO 2 was in-situ loaded onto flexible electrospun polyacrylonitrile (PAN) fibers by the assistance of polydopamine coating (MnO 2 /PDA/PAN fibers) and the as-obtained MnO 2 /PDA/PAN fibers were utilized for the removal of Pb 2+ from water. The structure and chemical composition of MnO 2 /PDA/PAN fibers were characterized in detail. The results indicated that the PDA coating onto PAN fibers can’t be neglected for loading MnO 2 . This preparation of MnO 2 /PDA/PAN fibers could avoid the agglomeration of MnO 2 particles and make the adsorbent separate easily from the adsorption solution. The adsorption experiments showed that the adsorption process toward Pb 2+ by MnO 2 /PDA/PAN fibers followed pseudo-second-order model and Langmuir isotherm model. In comparison with PDA/PAN fibers and MnO 2 /PAN fibers, MnO 2 /PDA/PAN fibers showed higher Pb 2+ adsorption capacity. The maximum adsorption capacity calculated from Langmuir model was 185.19 mg/g, which is higher than most of the reported PDA or MnO 2 based Pb 2+ adsorbents. The adsorption toward Pb 2+ by MnO 2 /PDA/PAN fibers still maintained stability after five adsorption/desorption cycles. In addition, the fiber adsorbent could also adsorb Pb 2+ from real industrial effluent with removal efficiency above 95%. This work indicates that MnO 2 /PDA/PAN fibers have great potential to be used as effective adsorbents for practical Pb 2+ removal.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Haorong Sun,Hangxi Liu,Ming Fang,Zeyi Chen,Yifeng Zhang,Xiaoli Tan
Heavy metal pollution, particularly Pb 2+ , poses a severe threat to human survival and ecosystem health due to its detrimental effects on organisms. Therefore, evaluating the concentration of Pb 2+ in the environment can help mitigate these risks in advance. In this study, Cu nanoparticles (Cu NPs) modified 2D Cu-Metal-organic frameworks (Cu(NPs)/Cu-MOFs@ITO) are prepared and loaded onto indium tin oxide (ITO) glass by an electrophoretic method to produce an electrochemical sensor (ECS) for Pb 2+ . Cu(NPs)/Cu-MOF-B was synthesized by a simple solvothermal method and characterized by XRD, SEM, TEM , Raman, FT-IR and other methods to analyze the crystal structure, molecular structure and microstructure. The Cu NPs improve the electron transfer ability, and the abundant surface amino groups of Cu-MOF can be used to bind Pb 2+ characterized by CVs and EISs. The excellent energy positions of valence and conduction bands of Cu(NPs)/Cu-MOF facilitate the electron migration in oxidation and reduction of Pb 2+ analyzed by XPS, Mott-Schottky and UV–vis absorption curves. The limit of detection (LOD) reaches 0.065 μM and the sensitivity reaches 99.04 μA μM -1 cm -2 . The Cu(NPs)/Cu-MOFs@ITO ECS can be successfully applied to detect Pb 2+ in water environments with high sensitivity, selectivity and reproducibility, which provides a feasible method for detecting Pb 2+ .
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Wei-Min Chen,Juan-Juan Shao,Fang-Ming Wang
Here firstly report a novel 3D bimetallic MOF. It can be used as a fast ratiometric fluorescent probe and fast adsorbent for Pb 2+ ions with its greatly fluorescence enhancement and a large red-shift stokes of 166 nm, which is the biggest shift of references. Moreover, it is also the first reported MOF material that can quantitatively analyze the lanthanide metal element Tb 3+ among LMOFs. The limits of detection are calculated as 4.12 × 10 −6 M and 2.94 × 10 −5 M. ICP-OES testing and calculation showed that the maximum adsorption capacity of LMOF-1 for Pb 2+ was calculated to be 23.75 mg/g at five minutes.
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INORGANIC CHEMISTRY
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2024
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IF 4.3
Jingyu Cai,Junjie Shi,Jian Zhang,Xiaoyu Miao,Sen Wang,Longqiang Xiao,Dan Liu,Linxi Hou
Electronic-grade isopropyl alcohol is widely utilized in the cleaning of semiconductors and microelectronic components. Removing ions like Pb2+ is crucial since the presence of impurities may cause degradation of electronics, increased failure rates, and short circuits. Membrane materials offer a number of advantages in the field of adsorption separation; however, the lack of adsorption sites results in limited adsorption capacity. In the current work, guanidino-grafted NH2-MIL-101(Fe) was incorporated into polyvinylidene fluoride (PVDF) to prepare MOF/PVDF mixed matrix membranes (NM/PVDF) for the removal of Pb2+ from isopropanol. Benefiting from the larger specific surface area and more lone electron pairs in the guanidine group, the Pb2+ adsorption capacity of the as-prepared NM/PVDF membrane was 29.4458 mg/g, which was higher than that of the NH2-MIL-101(Fe)/PVDF membrane (20.9306 mg/g) and the pure PVDF membrane (6.7324 mg/g). The NM/PVDF membrane was able to reduce the concentration of Pb2+ from 500 to 86.73 ppb. This work highlights the potential of guanidine-grafted Fe-based MOFs/PVDF membranes as adsorbents for acquisition of electronic-grade solvents.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Yaohui Xie,Xunsheng Guo,Yun Wei,Huiqin Hu,Liming Yang,Huiji Xiao,Hongyu Li,Genhe He,Penghui Shao,Guang Yang,Xubiao Luo
The resource of trace lead (Pb 2+ ) from wastewater bearing intricate components is imperative for sustainable progression of the lead-acid battery industry. Herein, we fabricated a tannic acid-based covalent polymeric hydrogel (TA@PMAM) with antimicrobial properties and stability via facile Michael addition reaction. The incorporation of tannic acid (TA) through robust covalent bond leads to a stable porous 3D covalent polymer network with almost no loss of mechanical properties even after 20 compression cycles. Batch adsorption experiments of TA@PMAM revealed an extraordinary adsorption capacity of Pb 2+ (Qe =196.6 mg/g), achieving 87.2 % of Pb 2+ adsorption within the first 5 min owing to porous structure, numerous adsorption sites and good hydrophilicity. Moreover, TA@PMAM demonstrated a strong affinity for Pb 2+ in the presence of the interfere metal ions (Cu 2+ , Co 2+ , Mn 2+ etc .) due to the carbonyl and phenolic hydroxyl that can specifically pair with Pb 2+ . Stable adsorption properties of TA@PMAM were confirmed in fixed bed column adsorption experiment using lead-acid batteries wastewater, retaining 79.56 % of initial adsorption capacity even after 10 times’ reuse. Besides, TA@PMAM possesses a broad spectrum of antimicrobial properties. This study sheds novel light on the design and fabrication of adsorbent, which holds great potential for commercialization in recovering lead from battery industrial wastewater.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Zhenzhou Yin,Gang Wang,Lu Wang,Pengyu Ren,Jian Sun,Hanghang Zhao,Puhui Ji
The sustainable development of society requires the support of developed industrial production, which inevitably produces a series of industrial by-products, including heavy metal-containing wastewater and solid waste. Using solid waste to adsorb heavy metal ions in wastewater is a sustainable way. This not only reduces the environmental threat caused by solid waste accumulation, but also reduces the treatment cost of heavy metal ions in wastewater. In this study, fly ash was modified to prepare magnetic adsorbent (M-AT), which was used to adsorb Cu 2+ and Pb 2+ in wastewater. The results showed that M-AT has a good adsorption effect on Cu 2+ and Pb 2+ in wastewater. Its maximum adsorption capacity for Cu 2+ and Pb 2+ was 53.18 and 85.86 mg/g, respectively. Ion exchange and complexation reaction were major adsorption mechanisms of M-AT for Cu 2+ and Pb 2+ , they played an important role in the adsorption process. M-AT maintained a good adsorption effect on Cu 2+ and Pb 2+ under different influence factors. This ensured that M-AT can be used in complex application environments. In addition, M-AT exhibited good reusability, its removal rate for Cu 2+ and Pb 2+ reached 50.21 % and 75.15 % after 5 adsorption–desorption cycles. And the removal rate of M-AT for Cu 2+ and Pb 2+ in domestic sewage treatment plant influent, tailings drainage, industrial wastewater was 82.80 %, 87.12 %, 85.12 % and 95.10 %, 91.20 %, 93.13 %, respectively. These results proved the feasibility of M-AT in treating Cu 2+ and Pb 2+ in wastewater. This study provides a new way for the resource utilization of fly ash. Applying solid waste to treat heavy metal-containing wastewater is a sustainable way to treat industrial waste.
研究领域:
环境科学
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材料科学
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Manting Li,Haikun Luo,Zhao Wang,Qian Mo,Shanshan Zhong,Yu-ang Mao,Shuting Li,Xinchun Li
Background Assembling framework nucleic acid (FNA) nanoarchitectures and tuning luminescent quantum dots (QDs) for fluorescence assays represent a versatile strategy in analytical territory. Rationally, FNA constructs could offer a preferential orientation to efficiently recognize the target and improve detection sensitivity, meanwhile, regulating size-dependent multicolor emissions of QDs in one analytical setting for ratiometric fluorescence assay would greatly simplify operation procedures. Nonetheless, such FNA/QDs-based ratiometric fluorescence nanoprobes remain rarely explored. Results We designed a sensitive and signal amplification-free fluorescence aptasensor for lead ions (Pb 2+ ) that potentially cause extensive contamination to environment, cosmetic, food and pharmaceuticals. Red and green emission CdTe quantum dots (rQDs and gQDs) were facilely prepared. Moreover, silica nanosphere encapsulating rQDs served as quantitative internal reference and scaffold to anchor a predesigned FNA and DNA sandwich containing Pb 2+ binding aptamer and gQD modified DNA signal reporter. On binding of Pb 2+ , the gQD-DNA signal reporter was set free, resulting in fluorescence quenching at graphene oxide (GO) interface. Owing to the rigid structure of FNA, the fluorescence signal reporter orderly arranged at the silica nanosphere could sensitively respond to Pb 2+ stimulation. The dose-dependent fluorescence signal-off mode enabled ratiometric analysis of Pb 2+ without cumbersome signal amplification. Linear relationship was established between fluorescence intensity ratio ( I 555 / I 720 ) and Pb 2+ concentration from 10 nM to 2 μM, with detection limit of 1.7 nM (0.43 ppb), well addressing the need for Pb 2+ routine monitoring. The designed nanoprobe was applied to detection of Pb 2+ in soil, cosmetic, milk, drug, and serum samples, with the sensitivity comparable to conventional ICP-MS technique. Significance Given the programmable design of FNA and efficient recognition of target, flexible tuning of QDs emission, and signal amplification-free strategy, the present fluorescence nanoprobe could be a technical criterion for other heavy metal ions detection in a straightforward manner.
研究领域:
分析化学
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纳米生物学
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环境科学
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Chuang Yang,Fuyan Chen,Yajie Zhao,Wushuang Bai
Rapid and accurate detection of lead (II) ions (Pb 2+ ) is of great importance for food and environmental safety. In this work, we developed a dual-mode biosensing strategy for Pb 2+ determination based on a bimetallic two-dimensional porphyrinic MOF nanocomposite and G-quadruplex DNAzyme, combined with enzyme-like synergistic catalysis and DNA hybridization chain reaction (HCR) amplification. The sensing platform provides both electrochemical and visual colorimetric readouts, enabling highly sensitive detection under different application scenarios. Benefiting from the coupling of HCR with the cooperative catalysis of the G-quadruplex DNAzyme and MOF nanocomposite, the assay shows markedly enhanced sensitivity. In the electrochemical mode, the sensor achieves a limit of detection of 0.4 nM with a linear range from 1 to 10,000 nM. In the colorimetric mode, the assay affords a detection limit of 2.6 nM with a linear range from 10 to 10,000 nM. This dual-mode Pb 2+ biosensing strategy shows promising potential for food safety monitoring and environmental pollution analysis, and provides a useful reference for the development of new techniques for trace heavy-metal ion detection.
研究领域:
环境监测
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食品安全
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生物传感器
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分析化学
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纳米材料
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 8
·087505
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IF 3.721
Xiaolei Zhu,Bingchuan Liu,Sijing Chen,Longsheng Wu,Jiakuan Yang,Sha Liang,Keke Xiao,Jingping Hu,Huijie Hou
A green and effective strategy to prepare a novel lotus root-like three-dimensional (3D) bismuth/biomass derived activated carbon (Bi@BAC) composite was developed for simultaneous electrochemical sensing of Pb2+ and Cd2+. The BAC supports herein were prepared from naturally-abundant Platanus seeds chemically activation by KOH, with dense and uniform bismuth micro/nano-sized particles successfully anchored on the carbon substrate through microwave-assisted hydrothermal treatment and subsequent carbothermal reduction process. Simultaneous electrochemical detection of Pb2+ and Cd2+ using square wave anodic stripping voltammetry (SWASV) was performed with the novel composite modified carbon paste electrode (CPE). Under optimized experimental conditions, the Bi@BAC/CPE demonstrated good linear response for both two target metal ions in the concentration range of 0.5 to 50 μg L−1, with limits of detection (LOD, S/N = 3) of 0.13 and 0.08 μg L−1 for Pb2+ and Cd2+, respectively. Moreover, the modified electrode displayed high resistance to interference, long-term stability and good reproducibility. The Bi@BAC/CPE also demonstrated satisfactory recovery level for the detection of target metal ions in real water samples.
研究领域:
环境科学
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材料科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
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IF 4.097
Dongfang Wang,Yingchang Ke,Di Guo,Hongxu Guo,Jianhua Chen,Wen Weng
A metal-organic frameworks (MOFs), cauliflower-like MIL-100(Cr), has been facilely prepared through simple reflux method for the first time and characterized by XRD, FT-IR, SEM and XPS. The MOFs was found to be useful for the simultaneous and selective electrochemical detection of microgram Cd(II), Pb(II), Cu(II), and Hg(II) in aqueous solution. The detection was performed by the square wave anodic stripping voltammetry (SWASV). The MIL-100(Cr) modified electrode showed an excellent selectivity and stability for Cd 2+ , Pb 2+ , Cu 2+ , Hg 2+ determinations. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH, deposition potential and deposition time were optimized for the purpose of determination of traces of metal ions .
研究领域:
材料科学
·
分析化学
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高影响因子
危险品化学品经营许可证（带存储）