Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Hao Luo,Shengxiao Zhang,Xiaoyan Li,Xia Liu,Qiang Xu,Junshen Liu,Zhenhua Wang
Tannic acid (TA) film covered magnetic microspheres (Fe 3 O 4 @TA–Fe 3+ ) was synthesized and applied for removal of Pb 2+ and Hg 2+ from aqueous solution. The resulted Fe 3 O 4 @TA–Fe 3+ was characterized with thermo-gravimetric analysis, vibrating sample magnetometer, transmission electron microscope, and Fourier transform infrared spectra. The adsorption of pollutants was pH dependent because the complexation of TA with Fe 3+ was disassembled at low pH. The composites showed high maximum adsorption capacity for Pb 2+ up to 1115.3 mg/g and Hg 2+ to 279.4 mg/g. Furthermore, the Fe 3 O 4 @TA–Fe 3+ composites could be easily separated from the solution by a magnet after adsorption because of the excellent superparamagnetic property. Thermodynamics study indicated that the adsorption of Pb 2+ and Hg 2+ on Fe 3 O 4 @TA–Fe 3+ sorbents was spontaneous, chaotic degree decreasing and endothermic process. The present results warrant the promising application of magnetic Fe 3 O 4 @TA–Fe 3+ composites for removal of Pb 2+ and Hg 2+ from contaminated water, and this study is the first application of TA film in environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3329
·
IF 5.719
Luogang Xie,Yang Yang,Gaoshang Gong,Shiquan Feng,Dewei Liu
Lead ions in water are harmful to human health and ecosystems because of their high toxicity and nondegradability. It is important to explore effective fluorescence probes for Pb2+detection. In this work, surface-functionalized molybdenum disulfide quantum dots (MoS2QDs) were prepared using a hydrothermal method, and ammonium tetrathiomolybdate and glutathione were used as precursors. The photoluminescence quantum yield of MoS2QDs can be improved to 20.4%, which is higher than that for MoS2QDs reported in current research. The as-prepared MoS2QDs demonstrate high selectivity and sensitivity for Pb2+ions, and the limit of detection is 0.056 μM. The photoluminescence decay dynamics for MoS2QDs in the presence of Pb2+ions in different concentrations indicate that the fluorescence quenching originated from nonradiative electron transfer from excited MoS2QDs to the Pb2+ion. The prepared MoS2QDs have great prospect and are expected to become a good method for lead ion detection.Keywords:molybdenum disulfide;quantum dots;lead ion;fluorescence probe
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 18
·9789-9798
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IF 7.443
Rong He,Weiming Li,Dayi Deng,Wensen Chen,He Li,Chaohai Wei,Youwen Tang
In order to develop a highly efficient method for direct removal of lead from acidic wastewater (pH 2.0), we introduce a novel highly ordered Pb2+ imprinted mesoporous silica (PbIMS) SBA-15 combining co-condensation and functionalized iminodiacetic acid (IDA). Fourier transform infrared spectroscopy (FTIR) and energy-dispersive X-ray (EDX) analysis provided the components of PbIMS. The solid-state 13C NMR spectra demonstrated the successful embedment of IDA in the mesoporous silica. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis confirmed that Pb2+ was coordinated by the N atom and carboxyl O atom of IDA. The results of transmission electron microscopy (TEM), small angle X-ray diffraction (XRD) and N2 adsorption–desorption measurement confirmed that the PbIMS preserved a highly ordered hexagonal P6mm mesostructure. The Brunauer–Emmett–Teller (BET) surface area was 762 m2 g−1. The saturated adsorption capacity of PbIMS toward lead reached up to 103 mg g−1 at pH 2.0, which was greater even than that of the simply modified SBA-15 by IDA at pH 4.5. The values of selectivity coefficients of PbIMS for six competing metal ions ranged from 67.3 to 12.7. The adsorption of Pb2+ reached equilibrium within 7 min. The adsorption efficiency of PbIMS was above 93% after six extraction–stripping cycles. The investigation conducted with real samples of strongly acidic wastewater demonstrated the ability of PbIMS to efficiently remove lead below the current China regulatory standard.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2018
·Vol. 8
·期 9
·1518
·
IF 1.689
Keteng Li,Genhua Wu,Min Wang,Xiaohong Zhou,Zhuqing Wang
A low-cost alginate-melamine hybrid sorbent (named as Alg-Mel) was designed and synthesized for the removal of Pb2+from water. The as-prepared Alg-Mel sorbent exhibited high affinity and selectivity to Pb2+. The selectivity coefficients of the Alg-Mel for Pb2+/Cd2+, Pb2+/Cu2+, Pb2+/Cr3+and Pb2+/Co2+were all over 7. It is found that the hybrid sorbent could uptake 95.4% of Pb2+from Pb2+-containing solutions (0.48 mM), and the maximum adsorption capacity for Pb2+reaches 1.39 mmol/g (287.7 mg/g), which is much higher than that of most reported lead ion-sorbents. Furthermore, the Alg-Mel can be regenerated by a simple acid-washing process and used repeatedly. The results of adsorption mechanism analysis reveal that the adsorption of Pb2+by Alg-Mel is mainly ascribed to the chemical coordination and ion exchange effects.Keywords:adsorption;alginate;adsorbent;lead ion;wastewater
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Yujie Yu,Chao Yu,Yazhen Niu,Jun Chen,Yilin Zhao,Yuchan Zhang,Rufei Gao,Junlin He
We designed an amplified detection strategy for the sensitive determination of lead ions (Pb 2+ ) based on a target-triggered nuclear acid cleavage of Pb 2+ -specific DNAzyme as a selectivity interface combined with Pd-Pt alloys modified Fe-MOFs (Fe-MOFs/PdPt NPs) hybrids acting as the signal tag. Streptavidin modified reduced graphene oxide-tetraethylene pentamine-gold nanoparticles (rGO-TEPA-Au) served as a sensor platform for immobilizing more DNAzyme. In the presence of Pb 2+ , the substrate DNA strand can be specifically cleaved at the ribonucleotide site by DNAzyme to produce a new single-DNA on the interface. Then, the hairpin DNA with hybrid strand matched by its complement to the single-DNA was employed to modify the Fe-MOFs/PdPt NPs bioconjugates for signal amplification . Fe-MOFs/PdPt NPs catalyze hydrogen peroxide (H 2 O 2 ) to produce the electrochemical signal which was recorded by chronoamperometry . Benefiting from the Pb 2+ -dependent DNAzyme, the proposed method can selectively detect Pb 2+ in the presence of other metal ions . The newly designed biosensor exhibited a good linear relationship ranging from 0.005 to 1000 nmol L −1 with a low detection limit of 2 pM (S/N = 3) for Pb 2+ . This Pb 2+ -dependent DNAzyme based ultrasensitive biosensor showed high sensitivity and selectivity, providing potential application for Pb 2+ detection in naturally contaminated sewage and spiked drinking water samples.
研究领域:
生物化学
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环境科学
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分析化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
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IF 8.3
Zhouxiang Zhang,Hassan Karimi-Maleh,Yangpin Wen,Rozhin Darabi,Tao Wu,Pardis Alostani,Masoumeh Ghalkhani
Lead ions (Pb 2+ ), as one of many common heavy metallic environmental pollutants, can cause serious side-effects and result in chronic poisoning to people's health, so it is highly significant to monitor Pb 2+ efficiently and sensitively. Here, we proposed an antimonene@Ti 3 C 2 T x nanohybrid-based electrochemical aptamer sensor (aptasensor) for high sensitive Pb 2+ determination. The sensing platform of nanohybrid was synthesized by ultrasonication, possessing the advantages of both antimonene and Ti 3 C 2 T x , which not only can vastly enlarge the sensing signal of the proposed aptasensor, but also greatly simplified its manufacturing flow, because antimonene can strongly interact with aptamer through noncovalently bound. The surface morphology and microarchitecture of the nanohybrid were perused by several methods such as scanning electron microscope (SEM), energy-dispersive X-ray mapping spectroscopy (EDS), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and atomic force microscope (AFM). Under optimal empirical conditions, the proposed aptasensor exhibited a wide linear correlation of the current signals with the logarithm of C Pb 2+ (Log C Pb 2+ ) over the span from 1 × 10 −12 to 1 × 10 −7 M and provided a trace discernment limit of 3.3 × 10 −13 M. Moreover, the constructed aptasensor displayed superior repeatability, great consistency, eminent selectivity , and beneficial reproducibility, implying its extreme potential application for water quality control and the environmental monitoring of Pb 2+ .
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xue Wang,Huan Zhang,Qingdong He,Haifeng Xing,Ke Feng,Fang Guo,Wenbo Wang
A series of sodium alginate (SA) grafted polymer composite beads were synthesized by a solution free-radical graft polymerization reaction performed in a surface crosslinked alginate bead reactor. The outer surface of the precursor droplet containing reactants including SA, acrylamide (AM), N,N′ -methylene- bis -acrylamide (MBA), ammonium persulfate (APS), sepiolite (SP) and gelatin (GE) was instantly crosslinked with Ca 2+ ions to form a capsule-like bead when it was dropped into aqueous solution of calcium chloride , and simultaneously the reactants inside the capsule-like “bead reactor” were polymerized in-situ to form new composite beads with crosslinked network structure, abundant functional groups, excellent single or co-adsorption ability and easily separable advantages. The optimal composite bead shows high adsorption capacities of 390.78, 1425.65 and 533.91 mg/g toward Methylene Blue (MB), Basic Fuchsin (BF) and Pb(II), respectively. After adsorption with the composite bead, 99.71% of MB, 99.99% of BF and 99.97% of Pb(II) were removed from original dye or Pb(II) solutions. Moreover, above 99.22% of BF and 95.33% of Pb(II) was co-removed from their binary mixture (BF concentration, 100 mg/L; Pb(II) concentration, 50 mg/L). This paper provides a simple green way to synthesize efficient and recyclable biopolymer-based adsorbents capable of purifying dyes and heavy metal ions in water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Yang Liu,Yuanyuan Wang,Jie Ma,Runping Han
ABSTRACT In this study, peanut shell was modified using β-cyclodextrin (β-CD) and citric acid to improve the adsorption capacity for removal of lead ion (Pb 2+ ) and bisphenol S (BPS) from solution in batch mode. Scanning electron microscopy, Fourier-transform infrared spectroscopy, elemental analysis, X-ray fluorescence analysis, specific surface area analysis, thermogravimetric analysis, etc were used to characterize the adsorbent before and after modification. The results showed that the adsorbent was successfully modified. The adsorption results of Pb 2+ and BPS on β-CD-PS indicated that acidic conditions were not conducive to the adsorption of Pb 2+ , the adsorption of BPS basically remained unchanged at pH 2~7, and alkaline conditions were not conducive to the adsorption. The presence of salt had a negative effect on Pb 2+ , but had no effect on the adsorption of BPS. The Langmuir and Koble–Corrigan models could predict the equilibrium adsorption process of Pb 2+ while Temkin and Koble–Corrigan models could describe the equilibrium adsorption process of BPS. The adsorption quantity from experiments is 89.6 mg·g –1 for Pb 2+ and 16.2 mg·g –1 for BPS at 293 K, respectively. The adsorption process of Pb 2+ was consistent with the pseudo-first-order and Elovich models, indicating the presence of ion-exchange in the adsorption process; the adsorption of BPS was consistent with the pseudo-second-order model, indicating that chemisorption was the main rate-controlling step. Thermodynamic studies indicated that the adsorption of Pb 2+ was a spontaneous and endothermic reaction with increasing entropy, while the adsorption of BPS was a spontaneous and exothermic reaction with decreasing entropy. 0.1 mol·L –1 HNO 3 could desorb and regenerate the β-CD-PS adsorbed Pb 2+ for three times, and 75% C 2 H 5 OH had a better desorption and regeneration effect for BPS loaded β-CD-PS. β-CD-PS can effectively remove the lead ion and BPS from mixtures and the study can provide the basis for the effective utilization of peanut shell in environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Guojie Liu,Yiwei Li,Congcong Cui,Min Wang,He Gao,Jun Gao,Jingbo Wang
1′-(4′-carboxybutyl) −3′, 3′-dimethyl-6-nitro-8-hydroxylspiro [chromene-2, 2′-indoline] (SPC) is a visual, selective, and sensitive detector to lead (Pb 2+ ) ions. The presence of 8 -hydroxyl in pyran ring makes SPC have a remarkable solvatochromism in polar solvents (SPC can isomerize to the ring-opening body (Mcc) spontaneously under visible light conditions), ascribed to the formation of intramolecular hydrogen bonds . The color and spectrum of the Mcc solution could be changed instantly and significantly by addition of Pb 2+ , and Mcc showed excellent selectivity to Pb 2+ in the simulated lead–zinc ore leachate. The complex Mcc - Pb 2+ , with a stoichiometry ratio of 1:1, can stably exist under visible light conditions, which is attributed to the interaction between Pb 2+ and the deprotonated carboxy (–COO — ), phenolic oxygen atom and 8-hydroxyl of the Mcc, and the whole process does not need UV irradiation, avoiding the serious photo-degradation of spiropyran derivatives. The low limit of detection (0.61 μM) and the established test strips indicate that SPC has the potential to be applied in the quantitative detection of Pb 2+ in real samples.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Brian Musikavanhu,Tingting Pan,Quanhong Ma,Yongdi Liang,Zhaoli Xue,Lei Feng,Long Zhao
Fluorescent chemosensors are often preferred for tracking toxic ions because of their non-destructive measurement and ease of use in environmental real samples and biosystems. Exploring high selectivity, great sensitivity, and biocompatible fluorophores with facile, accessible and dual-responsive features is currently highly demanding. A coumarin-based naphthol hydrazone Schiff base chemosensor, NaChro , is designed and synthesized in a two-step process to detect toxic metal ions with strong emission. Fluorescence spectra analysis demonstrates that the probe binds to Hg 2+ and Pb 2+ ions with a 1:1 and a 2:1 stoichiometry, respectively, with high sensitivity, short response time and minimal interference from other metal ions. The observed reversible turn-on reaction was attributed to the inhibition of C = N isomerization and excited-state intramolecular proton transfer (ESIPT) processes once the ions were introduced. The practical applications of NaChro are successfully addressed in paper strips, various water samples, HeLa cells and Zebrafish, demonstrating that the probe can detect and track Hg 2+ and Pb 2+ ions in environmental samples and biosystems.
研究领域:
环境科学
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生物化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-9
·
IF 6.232
Wu Weihao,Fan Yaofang,Tan Bing,Zhao Huimin
With the merits of low cost, simple synthesis procedure, and high affinity for metal ions, deoxyribozyme (DNAzyme) have played important roles in metal ions detection. However, the intracellular applications of DNAzyme are limited because of enzymatic degradation and inefficient cellular uptake. To address these problems, GR-5 as model DNAzyme was encapsulated into zeolitic imidazolate frameworks-8 (ZIF-8) nanoparticles by biomimetic mineralization. The positively charged ZIF-8 with high DNAzyme loading capacity retained their ability to enter cells. Compared with free DNAzyme, the biomimetic mineralization synthesis method has greatly improved the stability of pristine DNAzyme. The as-synthesized DNAzyme@ZIF-8 composite exhibited good stability resisting DNase I, and was used as a sensitive fluorescent nanoprobe for Pb 2+ determination and successfully achieved selective and sensitive determination for Pb 2+ at λ ex / λ em = 494/522 nm in real samples. The linear range for the determination of Pb 2+ is 50 to 500 nM. Moreover, the highly active DNAzyme delivered by ZIF-8 allows noninvasive imaging of Pb 2+ measurement in living cells. This strategy will extend the suitability of functional nucleic acids for in vitro and in vivo bioanalysis and bioimaging.
Graphical abstract
研究领域:
生物化学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2025
·
IF 3.3
Shaoying He,Wei Lin,Xin Liu,Fei Li,Hong Liang,Huo Xu,Chunhua Lu,Chao Xing
Lead pollution presents a significant threat to ecological systems and human health, underscoring the urgent need for highly sensitive detection methods. Herein, we introduce a novel DNA concatemer-encoded CRISPR/Cas12a fluorescence sensor (MDD-Cas12a) for sensitive detection of Pb2+ based on DNAzymes. To accomplish this, we designed a substrate strand containing a long DNA concatemer encoding multiple protospacer adjacent motifs (PAMs) and protospacer sequences for activation of the CRISPR/Cas12a system. The DNA concatemer was subsequently anchored to the surface of magnetic beads (MBs) to fabricate a MBs-DNA concatemer nanoprobe. In the presence of Pb2+, the DNAzyme structure catalyzes the cleavage of the substrate strand, leading to the release of DNA concatemers. Following magnetic separation, the released DNA concatemers significantly activate the non-specific trans-cleavage activity of the Cas12a/crRNA complex. The fluorescence reporter DNA is then completely cleaved by the activated Cas12a/crRNA complex, and the Pb2+ concentration in the sample can be quantified by measuring the fluorescence signal. By harnessing the specific recognition capability of DNAzymes for Pb2+, the programmability of DNA concatemers, and the self-amplification features of the CRISPR/Cas12a system, the MDD-Cas12a platform demonstrates high sensitivity and specificity for detecting Pb2+ in milk and lake water samples.
研究领域:
生物化学
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分子生物学
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环境科学
✓ 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）