INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Zhenwei Lian,Yanfeng Li,Hongyi Xian,Xiao-kun Ouyang,Yuqing Lu,Xiaowu Peng,Dalin Hu
A novel ethylenediaminetetraacetic acid (EDTA)-functionalized magnetic chitosan oligosaccharide and carboxymethyl cellulose (Fe 3 O 4 @CMCCOS-EDTA) nanocomposite adsorbent was successfully fabricated for Pb(II) adsorption. The adsorbent was characterized by Fourier transform infrared, and X-ray photoelectron spectroscopy was used to confirm successful EDTA modification and Pb(II) adsorption. Scanning electron microscopy, transmission electron microscopy , vibrating sample magnetometer, and thermogravimetric analysis were used to study the morphology and properties of magnetic particles. EDTA modification considerably improved the capacity of the adsorbent. The batch adsorption experiment results indicated that the pseudo-second-order (PSO) model and the Langmuir isotherm model reliably described the adsorption behavior. The maximum adsorption capacity ( q m ) for monolayer chemical adsorption was calculated to be 432.34 mg/g at the pH of 5 and temperature of 308 K. Notably, Fe 3 O 4 @CMCCOS-EDTA exhibited a high Pb(II) removal rate of ~100% using an initial metal ion solution of 100 mg/L and 200 mg/L.
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PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Zeyu Xue,Lu Dong,Zhaoping Zhong,Xudong Lai,Yaji Huang
Raw montmorillonite (MMT) was modified by intercalation-exfoliation method to improve the capture capacity of heavy metals (Pb, Zn, Cr and Cd) during coal combustion . Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) Spectroscopy and Brunner-Emmett-Teller (BET) indicated that intercalation agents cetyltrimethylammonium bromide (CTAB) and sodium dodecyl benzene sulfonate (SDBS) could be successfully inserted into the interlayer of MMT during the intercalation step, additionally exfoliation process could peel off the MMT into fine flakes. The co-combustion of coal and MMTs was conducted in a tube furnace from 900 to 1300 °C. Results indicated that with the increase of temperature, the retention ratio of Pb, Zn and Cd gradually decreased, especially higher than 1200 °C with a great capture capacity reduction, whereas for Cr, it rose first and then decreased. The capture performance of modified MMT on Pb, Zn and Cr was obviously improved. However, for Cd, adverse effect was observed, of which the capacity was even worse than that of raw MMT in some cases. According to the mechanism analysis, the intercalation-exfoliation modification of MMT primarily enhances the chemisorption of heavy metals by exposing more active sites, which facilitates the fixation of heavy metals in the form of aluminosilicates .
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12648-12658
·
IF 3.056
Zhu Junfeng,Gao Weichun,Zhao Wentian,Ge Lei,Zhu Ting,Zhang Guanghua,Niu Yuhua
Heavy metal lead is a typical widespread potentially toxic element (PET) contamination due to their extensive and wide applications in industrial processes. The development of cost-effective methods for preventing potentially toxic element lead residues from soil into food is thus highly desirable. A new type of humic acid-based remediation material (HA/WV) incorporating humic acid salt (HA), biochar powder (BC), and wood vinegar (WV), which is a cheap and environmentally friendly industrial by-product from charcoal processing, was prepared and evaluated. The results showed that 0.10 g remediation material HA/WV with a mass ratio of 1:1 was added to 1 kg surface soil of 0–20 cm from agricultural land contaminated by 300 mg Pb 2+ , the reduction ratio of available Pb in soil can reach 61.4%. Especially, wood vinegar can enhance the reduction ratio of available Pb by at least 14.7% over without wood vinegar. Furthermore, according to the analysis of adsorption interaction and the electrostatic attraction between Pb(II) and oxygen-containing functional groups on HA/WV are the dominant mechanisms responsible for Pb(II) sorption. The wood vinegar liquid can improve the oxygen-containing group in HA/WV, which can enhance the complexation of remediation materials and Pb(II) ion.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yu Wang,Qin Lei,Wanxin Dong,Xinxin Mo,He Li
In this work, a multicolor visual immunoassay platform was developed. The photoelectric effects of Ag 2 S NPs@ZnO NTs made the color changes of PANI/PB, which enabled visual inspection of CEA. Under the visible light excitation, Ag 2 S NPs@ZnO NTs generates electron-holes. Where, photoelectrons will pass electrical circuit to PB and photoinduced holes will oxidize PANI, which making the PANI/PB composite changes from emerald green-blue-purple-black colors. When CEA was incubated, the migration rate of photogenerated carriers is slowed down owing to the steric hindrance , resulting in different color changes of PANI/PB. In addition, the average green channel of PANI/PB read by photoshop has a certain correlated linear relationship with the concentration of CEA. Meanwhile, we can observe the color transformation of PANI/PB with our own eyes. By integrating advantages of photoelectrochemistry and colorimetry , the linear range of CEA detection was 0.1–20 ng/mL, and the detection limit was 0.05 ng/mL (S/N = 3). More importantly, this multicolor sensing method is very convenient, simple and low-cost. The photocarriers-modulated colorimetric strategy also provides a novel idea for visual portable platform design in clinical diagnosis.
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高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.354
Dailian Zhu,Cunqi Qin,Shanshi Ao,Mei Wang,Minghua Wu,Yaohong lü,Kemei Pei,Huagang Ni,Peng Ye
Hypercrosslinked functionalized lignosulfonates (CLS) were prepared by Friedel–Crafts alkylation reaction. The structure of CLS without introducing any functional groups and the according adsorption behaviors of Pb(II) were characterized and studied, respectively. Due to increase of specific surface area and abundance exposure of binding sites, the maximum adsorption capacity of CLS was found to be as high as 74.45 mg/g, which was about seven times that of raw lignin. The results provide a new feasible synthesis method for preparing lignin-based materials with porous structures and promising application for the removal of heavy metal ions from wastewater.
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高影响因子
Materials
·
2023
·Vol. 16
·期 23
·7470
·
IF 3.4
Yanling Yuan,Ling Gao,Naixin Li,Jiuning Gao,Yu Yan,Yiming Zhao,Zongqiang Ren,Hongxin Gong,Yunfei Zhang,Yongbin Liu,Ming Wu,Lisheng Zhong
Piezoelectric thin films grown on a mechanical, flexible mica substrate have gained significant attention for their ability to convert mechanical deformation into electrical energy though a curved surface. To extract the generated charge from the PZT thin films, bottom electrodes are typically grown on mica substrates. However, this bottom electrode also serves as a buffering layer for the growth of PZT films, and its impact on the piezoelectric properties of PZT thin films remains understudied. In this work, the effect of Pt and LaNiO3bottom electrodes on the piezoelectric effect of a Pb(Zr0.52,Ti0.48)O3thin film was investigated. It was observed that the PZT thin films on LNO/Mica substrate possessed weaker stress, stronger (100) preferred orientation, and higher remanent polarization, which is beneficial for a higher piezoelectric response theoretically. However, due to insufficient grain growth resulting in more inactive grain boundaries and lattice imperfections, the piezoelectric coefficient of the PZT thin film on LNO/Mica was smaller than that of the PZT thin film on a Pt/Mica substrate. Therefore, it is concluded that, under the current experimental conditions, PZT films grown with Pt as the bottom electrode are better suited for applications in flexible piezoelectric sensor devices. However, when using LNO as the bottom electrode, it is possible to optimize the grain size of PZT films by adjusting the sample preparation process to achieve piezoelectric performance exceeding that of the PZT/Pt/Mica samples.Keywords:PZT;piezoelectric effect;flexible sensor;ferroelectric thin film
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yueyang Wang,Fangfen Jing,Mingzhu Jin,Weiwei Lu,Shanshan Zeng,Yaling Zeng,Jianchao Xie,Rongtai Yu
Adsorption is recognized as a cost-effective, efficient, and versatile method for the treatment of heavy metal pollution, offering environmentally friendly solutions. The development of highly efficient and selective adsorbent materials is essential, with functional groups such as sulfhydryl and amine groups playing a crucial role in the effectiveness and selectivity of adsorption processes. Polymer-based materials have emerged as a promising class of selective adsorbents due to their naturally occurring amine groups. In this study, a bifunctional adsorbent with a concave morphology was developed by grafting sulfhydryl groups to selectively adsorb As(III) and Pb(II) from aqueous solutions. Maximum adsorption capacities for As(III) and Pb(II) were found to be 165.51 mg g −1 and 62.38 mg g −1 , respectively, at an optimum dosage of 0.05 mg mL −1 and an original concentration of 20 mg L −1 for both metals. Notably, the concave spheres exhibited superior morphology advantages for As(III) and Pb(II) adsorption compared to hollow and solid polymers, with adsorption capacities 1.8 times higher than hollow polymers and 3.7 times higher than solid spheres for As(III) adsorption, and 3.4 times higher than solid spheres for Pb(II) adsorption. Mechanistic studies revealed that the selective capture of As(III) was primarily attributed to the proposed reaction routes between As(III) and -SH groups. Isothermal models, including Langmuir and Freundlich, suggested that monolayer adsorption on homogeneous surfaces may dominate for As(III), while multilayer adsorption is favored for Pb(II) extraction.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
PeiPei Li,RenChun Fu,Du Jun,Hui Huang,ZhongCheng Guo
The nature of the electrode surface plays an important role in the electrode reaction. In this study, Pb- Ag alloy anodes modified with polyaniline films were prepared by galvanostatic polymerisation. Linear scanning voltammetry (LSV), cyclic voltammetry and potentiodynamic polarisation were measured and compared with those of unprepared Pb-Ag (0.3 wt%) alloy anodes. The oxygen evolution reaction potential of the modified anodes was lower than that of the unprepared Pb-Ag (0.3 wt%) anode at same anodic current density. The corrosion resistance of the modified anode was better than that of the unprepared Pb-Ag (0.3 wt%) anode. SEM images were obtained to characterise the morphology of the polyaniline film, and FTIR spectra confirmed that the film coating the Pb-Ag alloy was polyaniline.
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高影响因子
Small
·
2023
·Vol. 19
·期 20
·2207480
·
IF 13.3
Yuli Tao,Zheng Liang,Jiajiu Ye,Huifen Xu,Guozhen Liu,Dmitry Aldakov,Xu Pan,Peter Reiss,Xingyou Tian
Mixed lead-tin (Pb Sn) perovskite solar cells (PSCs) possess low toxicity and adjustable bandgap for both single-junction and all-perovskite tandem solar cells. However, the performance of mixed Pb Sn PSCs still lags behind the theoretical efficiency. The uncontrollable crystallization and the resulting structural defect are important reasons. Here, the bidirectional anions gathering strategy (BAG) is reported by using Methylammonium acetate (MAAc) and Methylammonium thiocyanate (MASCN) as perovskite bulk additives, which Ac − escapes from the perovskite film top surface while SCN − gathers at the perovskite film bottom in the crystallization process. After the optoelectronic techniques, the bidirectional anions movement caused by the top-down gradient crystallization is demonstrated. The layer-by-layer crystallization can collect anions in the next layer and gather at the broader, enabling a controllable crystallization process, thus getting a high-quality perovskite film with better phase crystallinity and lower defect concentration. As a result, PSCs treated by the BAG strategy exhibit outstanding photovoltaic and electroluminescent performance with a champion efficiency of 22.14%. Additionally, it demonstrates excellent long-term stability, which retains ≈92.8% of its initial efficiency after 4000 h aging test in the N 2 glove box.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jing Yu,Shukui Zhu,Pin Chen,Gang-Tian Zhu,Xiangtao Jiang,Siyuan Di
Core-shell porphyrin-based magnetic nanocomposites with multi-functional groups were synthesized and used as effective adsorbents and crystal nuclei for removing Pb(II) from water. The effect of initial Pb(II) concentration ( C 0 ), equilibrium time and experimental temperature on the adsorption capacity has been investigated. Under the optimized conditions, the removal rate of Pb(II) can reach 84.3% only within 5 min, more efficient than similar adsorbents. In addition, the maximum adsorption capacity of FST is up to 798.34 mg/g, which is much higher than previously reported results for removing Pb(II) in aqueous solution. Furthermore, the adsorption mechanisms were proposed based on the results of field emission scanning electron microscopy (FE-SEM), ultraviolet-visible spectroscopy (UV–vis) and X-ray diffraction tests. The adsorption processes could be well described by pseudo-second-order kinetic model regardless of C 0 . However, when C 0 was <19.2 mg/L, the adsorption process was a favorable monolayer interaction, controlled by the coordination between Pb(II) and porphyrin . When the C 0 was at the range of 19.2–512 mg/L, adsorption was multilayer interaction, and the process was controlled by crystallization and limiting solubility. Moreover, density functional theory (DFT) calculations have been used to study the optimal functional group towards Pb(II), which revealed that the adsorbability of tetrapyrrolic core to Pb(II) was better than that of NH, C O and Si O Si in porphyrin. This study provides a facile method for removal of Pb(II) from aqueous solutions and offers theoretical and practical guidance on new adsorbent designs for selective removal of heavy metal ions .
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Qin Lei,Yu Wang,Wanxin Dong,Haitao Sun,Jiaxin Lv,He Li
Herein, we used Prussian blue (PB) as an indicator for self-powered electrochromic visual sensing driven by photoelectrochemical (PEC) cell to detect prostate specific antigen (PSA). The sensor consists of a photoanode and a PB/ITO cathode. Under the visible light excitation, photoelectrons generated from the photoanode will transmit to PB through an external circuit, making the blue PB reduced to transparent Prussian white (PW). In the presence of PSA, the transfer rates of photoelectrons slow due to steric hindrance , leading to different fading degree of PB. Moreover, the color intensity of PB is proportional to the concentration of PSA, we can quantitatively detect the PSA according to the color intensity. Under the optimal conditions, the linear range of detecting PSA was 0.1–50 ng/mL with the detection limit of 0.03 ng/mL (S/N = 3). Meanwhile, the prepared novel sensing platform exhibited great selectivity and provided a rapid, visual method for PSA detection in human serum, which has great application prospects in point-of-care (POC) diagnostics.
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高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 21
·2860-2869
·
IF 3.474
Xiaoli Yu,Qi Diao,Xiaokai Zhang,Yong-Ill Lee,Hong-Guo Liu
Hexagonal ultrathin nanoplates of basic lead carbonates were synthesized in aqueous lead acetate solution under ambient conditions. The sizes of the nanoplates were found to reach several hundreds of nanometers to micrometers, whereas the plate thickness was only several nanometers, corresponding to 3, 4, or 5 stacking layers along the c-axis. These nanoplates exhibited effective catalytic properties for the hydrogenation of nitroarenes, such as nitrobenzene, 4-nitroaniline, and 4-nitrophenol, and other organic dyes, such as methylene blue and methyl orange in aqueous solutions in the presence of KBH4. Pb nanoclusters were generated in situ during the catalytic process and were well dispersed on the surface of the nanoplates, leading to the formation of a zero-dimensional/two-dimensional (0D/2D) heterostructure. It was also found that the heterostructure exhibited different catalytic behaviors for the hydrogenation of the compounds mentioned above due to the different molecular structures and different adsorption and desorption abilities of the reactants and products. Such a heterostructure can be also anticipated to be an effective photocatalyst due to its strong UV-light absorption, the ultrathin characteristics of the highly crystalline nanoplates and the transfer abilities of the Pb nanoparticles.
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