International Journal of Electrochemical Science
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2023
·Vol. 13
·期 2
·1423-1440
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IF 1.5
Ruizhuo Ouyang,Lina Xu,Haifeng Wen,Penghui Cao,Pengpeng Jia,Tian Lei,Xia Zhou,Mei Tie,Xiaolei Fu,Yuefeng Zhao,Haizhou Chang,Yuqing Miao
A novel indium doped bismuth hybrid nanofilm was prepared on a glassy carbon electrode (Bi@In/GCE) and successfully used for the simultaneous measurements of aqueous zinc (Zn(II)), cadmium (Cd(II)) and lead (Pb(II)). The Bi@In hybrid nanofilm was greatly improved in the ability of electron transfer, surface morphology as well as hydrophilicity over single Bi or In film, and exhibited well-defined and separate peaks for Zn(II), Cd(II) and Pb(II) by square wave stripping voltammetry. Analytical characteristics of the developed Bi@In/GCE were explored by comparing with single Bi and In film modified electrodes with calibration curves, which exhibited the most preferable electrochemical behaviors toward three metals as predicted. The synergistic effect of Bi and In mainly contributed to the enhanced electrochemical activity of the new electrode. In the concentration range of 0-120 µg L -1 , a good linear relationship was achieved between the peak current and the metal concentration with correlation coefficient higher than 0.995. The detection limits were calculated to be 0.52, 0.15 and 0.67 µg L -1 for Zn(II), Cd(II) and Pb(II) (S/N=3), respectively. The analysis of river sample with Bi@In/GCE was performed with satisfactory recoveries higher than 98%, suggesting that the new method is promising as a simple, sensitive and efficient approach to detect the heavy metals in water samples.
研究领域:
分析化学
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环境监测
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电化学传感
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纳米材料
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水污染检测
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2026
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IF 3.8
Yin Yanjun,Shen Hailin,Wang Mengyao,Suo Zhiguang,Liu Yong,Wei Min
A self-calibrated ratiometric electrochemical aptasensor was developed for the detection of ochratoxin A. This sensor is based on DNA-mediated gold/prussian blue nanoflowers (Au/PB NFs), methylene blue/platinum/zinc-cobalt metal-organic framework (MB/Pt/ZnCo MOF), and an exonuclease III (Exo III)–driven bipedal DNA walker cyclic amplification strategy. The self-calibration mechanism of this sensor relies on the ratio between the response signal of MB/Pt/ZnCo MOF (I MB ) and the internal reference signal of Au/PB NFs (I PB ). This ratio can effectively resist external interference factors. DNA-mediated Au/PB NFs with a flower-like structure provide stable internal reference signals and promote electron transfer. MB/Pt/ZnCo MOF, leveraging ZnCo MOF with a porous structure and bimetallic synergistic effects, and Pt with electrocatalytic activity, serve as response signals. An Exo III–driven biped DNA walker was used to realize the cyclic amplification strategy. The sensor showed a wide linear range of 0.001~500 ng/mL, with a low limit of detection of 0.17 pg/mL. The detection capability of spiked corn flour, wine, and coffee powder samples was satisfactory, and the detection results for the quality control samples of coarse rice flour and wheat flour were not significantly different from those of high-performance liquid chromatography (HPLC), showing the potential for practical application.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Kai Wang,Chunqing Niu,Xin Zhang,Nuo Liu,Zhengxin Luo,Chunhong Zhu,Jian Shi
A mixed mono−/multidentate ligand strategy engineered defective MIL-100(Fe). • Coordinatively unsaturated Fe O sites promoted rapid heavy-metal adsorption. • Defect engineering integrated Fe O exposure and amino functionalization. • Synergistic Fe–O/NH₂/COO − sites enhanced adsorption kinetics and affinity. • A flexible MOF membrane achieved efficient and recyclable heavy-metal removal. To address Pb(II) and Cd(II)-dominated heavy-metal contamination in water, a series of amino-bearing, defect-regulated Fe-based metal-organic frameworks (MOFs) were constructed using ligand engineering. In the synthetic design, the tritopic linker 1,3,5-benzenetricarboxylic acid (H₃BTC) was coupled with the monotopic modulator p-aminobenzoic acid (PABA), enabling the simultaneous generation of coordinatively unsaturated Fe O centers and exposed -NH₂ functionalities within the framework. This dual functionalization substantially strengthened the affinity of the adsorbent for divalent heavy-metal ions. Among the obtained samples, 6 mg Fe(BTC)₈(PABA)₂, corresponding to an H₃BTC/PABA feed ratio of 8:2, delivered the best adsorption performance under the conditions of 25 °C, pH 5, and an initial concentration of 150 mg/L, with maximum uptake values of 732.03 mg/g for Pb(II) and 654.05 mg/g for Cd(II), and equilibrium was achieved within 15 min. Kinetic and equilibrium analyses followed the pseudo-second-order model and Langmuir isotherm, respectively, indicating that monolayer chemisorption dominates the capture process. To improve the handling, recovery, and reusability of Fe(BTC)₈(PABA)₂ particles, they were incorporated into a polyacrylonitrile (PAN) nanofibrous matrix via electrospinning to obtain a Fe(BTC)₈(PABA)₂@PAN membrane. The membrane retained good structural stability and pronounced selectivity, particularly for Pb(II), in both binary-ion media and multi-cationic aqueous systems. After five adsorption-desorption cycles, more than 83% of the initial adsorption capacity was retained. DFT (Density functional theory) calculations further supported the experimental observations, showing that the adsorption originated from cooperative coordination among unsaturated Fe-O-M sites, carboxyl oxygen atoms, and amino nitrogen atoms. Therefore this study provides a defect- and functionality-coupled strategy for developing MOF-based adsorbents with both rapid uptake and high capacity for heavy-metal remediation. Download: Download high-res image (331KB) Download: Download full-size image
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Carbon Energy
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2026
·
IF 21.4
Pubao Peng,Yang Geng,Jiajun Nan,Song Li,Dewei Zhang,Qing Lin,Yaru Gong,Guodong Tang
Polycrystalline SnSe has attracted significant attention due to its facile processing, machinability, and scale-up application. However, n-type polycrystalline SnSe consistently exhibits inferior thermoelectric performance compared to p-type polycrystalline, because SnSe is an intrinsic p-type semiconductor. Here, we promoted the thermoelectric performance of n-type polycrystalline SnSe through manipulating the band structure and dislocations. The band convergence and enhanced density of states in the electronic structure of SnSe promoted by Pb/Ge/Br codoping, lead to significant enhanced Seebeck coefficient. The carrier concentration was simultaneously enhanced through Ge/Pb/Br codoping. The combination of a large Seebeck coefficient and the enhanced electrical conductivity gives rise to a high power factor as high as 7.47 μW cm −1 K −2 at 873 K. Furthermore, we found that dopants induce strong atomic strain disturbance in the SnSe matrix because of large differences in atom radius with host elements, leading to the formation of high-density dislocations. The presence of dislocations and nanoprecipitates forms strong phonon scattering centers, effectively scattering phonons and suppressing lattice thermal conductivity. As a result, a high peak ZT of 1.6 has been obtained in n-type Sn 1.04 Ge 0.02 Pb 0.02 Se 0.97 Br 0.03 .
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MOLECULES
·
2026
·Vol. 31
·期 6
·1006
·
IF 5.1
Yiting He,Xiayu Zhu,Ajun Li,Shuyuan Lin,Bo Li,Songbin Liu,Xinyu Ye
CsPbBr3perovskite quantum dots (QDs) have attracted significant attention for optoelectronic applications owing to their outstanding optical properties, yet achieving controlled synthesis with high stability under mild conditions remains a challenge. The room-temperature synthesis of CsPbBr3perovskite quantum dots using a coprecipitation method is systematically investigated in this work, with an emphasis on how the structural and optical properties of the QDs are influenced by the Br/Pb ratio and OA/OAm ratio. The findings show that controlling the Br/Pb and OA/OAm ratios can effectively influence the size, crystalline phase, and surface passivation properties of CsPbBr3quantum dots. The photoluminescence peak shifts blue and the bandgap widens when the Br/Pb ratio rises due to a decrease in quantum dot size. This is mainly explained by more effective surface covering by Br−ions and increased quantum confinement effects. The resultant quantum dots demonstrate ideal optical performance at a Br/Pb ratio of 75 and an OA/OAm ratio of 1.5, with dense ligand coverage, superior defect passivation, and markedly improved stability under UV irradiation and in aqueous environments. Variations in the Br/Pb and OA/OAm ratios affect the binding configuration and coverage of ligands on the quantum dot surface, thereby influencing the relationship between non-radiative recombination and the quantum confinement effect. The LED fabricated with the as-synthesized high-performance quantum dots demonstrates a wide color gamut, covering 129.45% of the NTSC standard, indicating strong potential for display applications.
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ACS Omega
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2026
·
IF 5.2
Zhaobo Hu,Yan Guo,Peishuo Cao,Keyan Wei,Zongjie Ma,Boxin Li,Dong Li,Liang Zhou,Chang-ye Hui
Abstract This work presents an engineered single-plasmid, dual-pigment whole-cell biosensor for simultaneous colorimetric detection of Pb(II) and Hg(II). To address the challenge of signal interference in cocontaminated environmental samples, a Pb(II)-responsive PbrR regulatory module driving indigo biosynthesis (blue, 620 nm) and an Hg(II)-responsive MerR module driving deoxyviolacein biosynthesis (purple, 570 nm) were integrated into Escherichia coli TOP10. The orthogonal decoupling of the two pigment pathways, combined with a unified 10 h induction protocol, enables independent chromogenic readout of both metals from a single cultivation. Dose-response assays afforded a broad linear dynamic range for Pb(II) of 0.977–2000 μM (R2 = 0.9503) with a limit of detection (LOD) of 0.977 μM, alongside nanomolar sensitivity for Hg(II) with a linear range of 0.244–250 nM (R2 = 0.9800) and an LOD of 0.244 nM. A two-dimensional cross-concentration matrix experiment further demonstrated that the two detection channels maintain distinguishable dose-dependent responses under coexposure conditions, with crosstalk remaining within an acceptable range. Robust performance was retained in spiked surface water and seawater matrices, yielding Pb(II) LODs of 0.244 μM (surface water) and 0.488 μM (seawater), and Hg(II) LODs of 0.488 nM (surface water) and 0.977 nM (seawater). These detection limits approach or fall below relevant environmental regulatory thresholds, including the Class III surface-water standard for Hg(II). This self-contained, instrument-free pigment-based approach enables naked-eye discrimination of both metals in a standard microplate assay, offering a low-cost, high-throughput screening platform that complements standard instrumental methods for on-site environmental monitoring and emergency pollution response.
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ACS Omega
·
2024
·
IF 3.7
Xin Xu,Ze Zhang,Hongwei Yu,Tong Shen,Hongzhi Pan,Dong Chang
Nonsmall cell lung cancer (NSCLC), due to its lack of early symptoms, has become one of the leading causes of cancer-related deaths globally. Exosomes, small membrane vesicles secreted by cells, are widely present in human bodily fluids. In the bodily fluids of NSCLC patients, the quantity of extracellular vesicles is double that of healthy individuals, suggesting their potential as biomarkers for screening NSCLC. This study designed a dual-modal aptasensor that integrated excellent sensitivity in electrochemical detection and portability in fluorescence detection into one device. AuNPs were functionalized with exosome-capturing probes containing thiol-modified CD63 aptamers, which were immobilized on screen-printed gold electrodes. On the other hand, the carboxylated CD63 aptamer was immobilized on the surface of PB-modified g-C3N4 loaded with Co-SANs particles (Co@g-C3N4@PB). By combining these components, a sandwich structure (AuNPs/Apt1/Exo/Apt2- Co@g-C3N4@PB) was constructed, forming a probe for specific exosome recognition. First, the samples were preliminarily assessed for their positive or negative status under a fluorescence inverted microscope. Subsequently, a more in-depth quantitative analysis was conducted on suspected positive samples using electrochemical or fluorescence analysis methods. The detection limits for electrochemical analysis and fluorescence analysis were 66.68 and 33.5particles/mL, respectively. In the analysis of clinical serum exosome samples, the developed dual-modal aptasensor effectively distinguished serum specimens from those of NSCLC patients and healthy volunteers. This highlighted the inspection capability of the dual-modal adapter sensor, especially in point-of-care testing, making it a highly suitable tool for clinical applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Hongjuan Jiang,Zhigang Yi,Yaoning Chen,Yuanping Li,Mengyang Zhao,Jun Wang,Yihuan Liu,Xuyang Jia,Mengwei Luo,Yaoqin Nie,Nianping Chi
This study developed recyclable magnetic layered double oxide beads (Mag-LDO) for composting with heavy metal-contaminated soil and agricultural waste, aiming to reduce heavy metals (HMs) concentration and bioavailable forms, enhance humification, and elucidate the underlying mechanisms. Results showed that a 5 % addition of Mag-LDO increased humic acid (HA) formation by 16.02 % and significantly reduced total Cd and Pb by 18.38 % and 21.93 %, respectively, compared to the control group. Moreover, it effectively reduced BF-Cd and BF-Pb by 16.31 % and 10.37 %, respectively. These results demonstrated its potential for enhancing humification and remediating HM-contaminated soil. The analysis of microbial community and Mantel-test showed that Mag-LDO facilitated the formation of HA mainly by modulating the microbial community. Meantime, Mag-LDO not only adsorbed Pb and Cd via ion exchange and precipitation processes to reduce the mobile forms of these metals, but also enhanced the stabilized state of HMs through increasing HA in compost and proliferating Bacillus and Pseudomonas . Furthermore, recovering the Mag-LDO adsorbed HMs could decrease the total HM content in the compost. These findings contribute to advancing new perspectives for the HMs removal and the promotion of humification during composting.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Varney Edwin Johnson,Qi Liao,Bob Wisdom Jallawide,Richmond Anaman,Charles Amanze,Peicheng Huang,Wei Cao,Chunlian Ding,Yan Shi
Efficient removal of arsenic (As) and lead (Pb) from industrial wastewater has long been a critical environmental issue due to their serious risk to human health. Therefore, in this work, a modified banana peel biochar (MBPB) was prepared by mixing calcium nitrate , diammonium hydrogen phosphate , sulfuric acid, ferric nitrate with dehydrated banana peel biochar as adsorbent for As(V) and Pb(II) removal in wastewater, and their absorption mechanism was investigated. SEM-EDS, TEM, FTIR , XRD , XPS , BET, kinetic, and isothermal characteristics of MBPB and pristine banana peel biochar (PBPB) were conducted. The behavior of both metal ions on MBPB and PBPB was well explained by the pseudo-second-order kinetic with Langmuir and Freundlich models. We found that the two biochar’s behaviors were mixture processes of monolayer and multilayer adsorption , achieving maximum capacities as determined by the Langmuir model of 39.5 mg g −1 (MBPB-As), 33.2 mg g −1 (MBPB-Pb), 30.8 mg g −1 (PBPB-Pb), and 23.5 mg g −1 (PBPB-As), with maximum efficiencies of 98.7% (MBPB-As) and 90.3% (MBPB-Pb) under optimum conditions. Thermodynamic tests showed that As(V) and Pb(II) removal on MBPB was a spontaneous and endothermic physisorption process. MBPB showed great reusability in As(V) and Pb(II) removal, with removal rates as high as 71.4% and 66.5% after five cycles, respectively. Selective adsorption of As(V) and Pb(II) was also investigated on MBPB, and the removal rate was still high in the mixture of heavy metals. These findings provide a feasible method for the environmental-benign utilization of banana peel as a low-priced adsorbent in wastewater treatment .
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Solar RRL
·
2022
·Vol. 6
·期 12
·2200721
·
IF 9.173
Hang Hu,Jiyao Zhang,Yulan Huang,Deng Wang,Dongyang Li,Jiabang Chen,Jiawen Wu,Luozheng Zhang,Xianyong Zhou,Bihua Hu,Xingzhu Wang,Jianyong Ouyang,Baomin Xu
There have been a number of remarkable signs of progress achieved in tin–lead mixed narrow-bandgap perovskite solar cells (PSCs) due to the high theoretical power conversion efficiency (PCE) and their promising application in tandem devices. Indeed, Sn–Pb mixed PSCs without a hole transport layer (HTL) also have been more attractive owing to lower cost and simplification of the device structure. However, the defects in perovskite film introduced by Sn 2+ oxidation severely restrict device efficiency and stability.Herein, a small organic molecule, 4,4'-sulfonyldiphenol, is employed to passivate perovskite ( E g = 1.26 eV) surface to decrease the interfacial defects and suppress the nonradiative carrier recombination. Furthermore, by regulating energy-level alignment, charge carrier extraction is greatly facilitated. The device performance is significantly enhanced in that the champion PCE is enlarged to 21.43% with an open-circuit voltage ( V oc ) of 0.876 V from only 18.02% with a V oc of 0.770 V. The stability of unencapsulated devices is improved substantially as well while retaining 80% PCE of its initial value after being stored in the glovebox for around 600 h. This facile but highly effective strategy successfully proposes the promising development of HTL-free Sn–Pb mixed PSCs.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
·
IF 5.876
Yaoyao Zhang,Luca Magagnin,Kangze Yuan,Zhengwen Wei,Xishe Wu,Zhenyi Jiang,Wei Wang
Mesoporous amino functionalized silica aerogels (MASA-X) with high adsorption capacity were prepared at ambient pressure conditions for removal of Pb (II) ions from water. Supported by SEM images and FTIR spectra, the presence of –NH 2 groups and porous structures on the surface of MASA-X were demonstrated, which played a critical role in promoting the interfacial adsorption process . The adsorption isotherm fitted well by Langmuir model, indicating that the adsorption occurred on a homogeneous surface and the maximum adsorption capacity of MASA-1, MASA-2, MASA-3, MASA-4 were 444.4 mg/g, 628.93 mg/g, 549.45 mg/g and 286.53 mg/g, respectively, and MASA-2 demonstrated optimal adsorption performance. The kinetic data showed good correlation coefficient with the pseudo-second order kinetic model, and the adsorption equilibrium of MASA-1, MASA-2, MASA-3, MASA-4 were reached in 120 min, 60 min, 20 min and 20 min, respectively. And raising temperature facilitated the adsorption of Pb (II) as it was a spontaneous and endothermic process. It was noteworthy that MASA-2 showed satisfactory reusability after eight adsorption-desorption cycles. FTIR, XPS coupled with Density Functional Theory (DFT) calculation revealed that the involvement of monodentate N atoms in the coordination with Pb (II) on adsorption of Pb (II) by MASA-2. The environmental impact of the MASA-2 preparation process was calculated through Life Cycle Assessment (LCA) and by analyzing the contribution of each material in the production of MASA-2, a more environmentally friendly and effective production strategy has been finally proposed, which could facilitate the promotion of MASA-X adsorbents in the heavy metal contaminated water market.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Jian Liu,Yingbi Chen,Yuting Hu,Yiting Zhang,Gengwei Zhang,Shixing Wang,Libo Zhang
A metal-organic framework (ZnO@ZIF-8) with great adsorption potential was developed using ZnO nanoparticles as a surface-active center and applied to lead removal from wastewater. The adsorption experiments were carried out and the related adsorption behaviors were investigated. The adsorbent shows excellent adsorption performance between pH 3–5. The maximum adsorption capacity of ZnO@ZIF-8 for Pb (II) was 689.36 mg/g at 303 K. The adsorptive process of Pb (II) onto ZnO@ZIF-8 conforms to the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamics illustrate that the adsorption process is chemical adsorption on a uniform surface. Selectivity experiments showed that ZnO@ZIF-8 had the strongest affinity with Pb (II). The adsorption-desorption cycle confirmed that ZnO@ZIF-8 was a reliable and recyclable adsorbent. XPS, Zeta potential and FT-IR analysis illustrate that the adsorption of Pb (II) by ZnO@ZIF-8 was concentrated in electrostatic adsorption and chelation. DFT calculation indicated that there are different types of Pb (II) combination mode (Pb-N and Pb-O) and the adsorption mainly depended on the chelation. This study presented herein played important roles in the governance of heavy metal waste-water pollution as a result of ZnO@ZIF-8 can effective selectivity cleanup of Pb (II).
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