MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Wen-Juan Wang,Xin-Yang Lu,Fen-Ying Kong,Heng-Ye Li,Zhong-Xia Wang,Wei Wang
A reduced graphene oxide supported Au-Bi bimetallic nanoparticles (rGO/Au-Bi) have been synthesized and employed as a novel sensing platform for electrochemical determination of Pb 2+ and Cd 2+ simultaneously. The successful formation of rGO/Au-Bi nanocomposites was investigated by means of transmission electron microscopy and X-ray photoelectron spectroscopy. At the rGO/Au-Bi nanocomposites modified electrode, two well-resolved voltammetric peaks for Pb 2+ and Cd 2+ were observed in differential pulse anodic stripping voltammetry (DPASV) measurements. Under the optimized conditions (pH 4.5, deposition potential −1.0 V, deposition time 200 s), the DPASV response currents demonstrated good linearity with the concentration of Pb 2+ (0.1–500 μg L −1 ) and Cd 2+ (0.1–300 μg L −1 ). The detection limits was 0.05 μM for Pb 2+ and 0.02 μM for Cd 2+ , respectively. In addition, the proposed electrode exhibited outstanding resistance to potentially interferents, high stability and excellent repeatability. Satisfactory application of proposed electrode was also demonstrated by the determination of Pb 2+ and Cd 2+ in real river water samples.
研究领域:
分析化学
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环境科学
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高影响因子
ELECTROCHIMICA ACTA
·
2026
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IF 5.8
Juan Wei,Jin-Tao Cheng,Min Luo,Xi Wang,Xiao-Yu Xie,Xian Wu,Wei Shen,Pang-Da Dai,Zong-Yin Song,Meng Yang
Designing a highly sensitive electrochemical sensing interface and elucidating the mechanism of enhanced electrochemical signals from the perspective of electronic structure are crucial for accurate detection of heavy metal ions (HIMIs). In this study, a composite transition metal sulfide Co 9 S 8 @MoS 2 heterostructure was developed for the high-sensitivity detection of Pb(II) in Chinese herbal medicine, which achieved a high sensitivity of 103.3 ± 0.5 μA μM −1 and a detection limit of 0.01 μM. Moreover, the fundamental reason for the excellent detection of Pb(II) was investigated by X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). The results indicated that the recombination of the heterojunction not only catalyzes the activation of the Co site in Co 9 S 8 but also promotes S as a medium in the electron channel for increased charge transfer. In addition, the proposed method displayed anti-interference ability with outstanding stability and reproducibility in the presence of other HMIs. Importantly, the highly sensitive detection of Pb(II) has also been inherited in herbal Rehmannia glutinosa samples, demonstrating its potential for practical application in the detection of heavy metal ions in Chinese herbal medicine. This work provides essential theoretical guidance for constructing high-performance electrochemically sensitive interfaces from electronic structure-controlled sensing materials.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 22
·13473-13482
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IF 10.733
Kailun Zou,Yu Dan,Yuxi Yu,Ying Zhang,Qingfeng Zhang,Yinmei Lu,Haitao Huang,Xin Zhang,Yunbin He
Dielectric nanocomposites composed of a polymer matrix with high electric breakdown strength and inorganic ferroelectric nanofillers with large maximum electric displacement (Dmax) have recently attracted much attention due to their high power density, superior flexibility, and good fatigue endurance. However, their discharge energy density and energy efficiency are limited because of the high remnant displacement (Dr) and small Dmax − Dr values of the ferroelectric fillers. Compared with ferroelectrics, antiferroelectrics exhibit much lower Dr (near zero) and far larger Dmax − Dr values, and thus if they are used as the fillers of the dielectric composite, a larger discharge energy density and higher energy efficiency may be obtained simultaneously. Based on this, in this work, Pb0.97La0.02(Zr0.50Sn0.45Ti0.05)O3 (PLZST) antiferroelectric nanoparticles (∼200 nm in diameter) coated with a dense and robust dopamine layer are prepared in order to develop dopamine-modified PLZST filler/poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) polymer nanocomposites with superior energy storage properties. The experimental results indicate that optimizing the filler content leads to a small Dr (0.61 μC cm−2), large Dmax − Dr value (6.14 μC cm−2), and high electric breakdown strength (3136 kV cm−1), as a result of which, the PLZST/P(VDF-HFP) nanocomposites filled with 5 wt% dopamine-modified PLZST nanoparticles simultaneously exhibit a large discharge energy density of 9.39 J cm−3 and high energy efficiency of 82%. These energy storage properties are superior to those of most ferroelectric filler (including nanowires and nanofibers prepared by complicated methods)/polymer nanocomposites with a single-layer structure. Our work not only proves that, antiferroelectric nanoparticles are excellent fillers that can be comparable to, or even better than, ferroelectric nanowires and nanofibers prepared by very complicated methods, for energy-storage inorganic/polymer dielectric composites, but also provides a convenient and effective way to prepare and design flexible dielectric capacitors with superior energy storage capacity.
研究领域:
材料科学
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纳米技术
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电气工程
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复合材料
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Chunwen Chang,Qiang Xue,Rong Wang,Zeyu Liu,Yao Liu,Lin He,Fei Liu,Haijiao Xie
Development of an efficient monitoring technology for rapid detection of toxic Pb(Ⅱ) ion in water environments is extremely important. Here, a novel and highly sensitive sensor was prepared using one-step calcination technique, based on Bi 2 O 3 nanoparticles and carbonized metal–organic framework (MOF) nanocomposite. Scanning electron microscopy, transmission electron microscopy, contact angle and X-ray photoelectron spectroscopy characterization methods were used to analyze the morphology and structure of the prepared materials. Based on the electrical double-layer capacitance theory and Raman spectroscopy, changes to the active sites of different modified materials were investigated. Besides, differential charge densities and adsorption energies of the different modified materials in Zr-O clusters were calculated using density functional theory (DFT). A Bi 2 O 3 and carbonized UIO-66-NH 2 (Bi 2 O 3 /C-UIO-66-NH 2 ) -modified glassy carbon electrode was used to detect Pb(Ⅱ) by differential pulse anodic stripping voltammetry. Under optimal experimental parameters, the developed electrochemical sensor has a wide linear range (2–130 μg/L) and a low detection limit (0.05 μg/L). Meanwhile, the sensor has excellent stability, repeatability, and anti-interference properties and has been successfully applied to detect Pb(Ⅱ) in actual water samples. The results of this paper show that our developed sensor an efficient and rapid sensor technology for monitoring lead in water environment.
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Journal of Cleaner Production
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2022
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IF 11.072
Shuangjian Yang,Liyun Yang,Mengdan Gao,Hao Bai,Tetsuya Nagasaka
Zeolite-geopolymer composites synthesized using industrial solid waste have mechanical strength, high specific surface area and cation exchange ability. This self-supporting adsorbent can replace natural heulandite zeolite to remove metal ions . In this study, a zeolite-geopolymer composite with a high zeolite content was synthesized by a simple two-step process using fly ash and metakaolin as raw materials. The compressive capacity, pore structure and adsorption ability for Pb(II) in the solution of the composite were analyzed and compared with natural heulandite zeolite. Through the two-step synthesis, the dynamic conditions of zeolite crystallization and geopolymer solidification were determined, and the zeolite-geopolymer composite with 57.5% zeolite A content and 6.42 MPa compressive strength was successfully prepared. The composite had hierarchical pore sizes, including microporous, mesoporous and macroporous pores, and its specific surface area was larger than that of natural heulandite zeolite. The Pb(II) adsorption capacity of the composite could reach 446.73 mg/g through ion exchange and hydroxyl reactions in solution, which was higher than the value of 323.37 mg/g for natural heulandite zeolite. Therefore, zeolite-geopolymer composites with high zeolite content synthesized by the simple two-step method can be used as self-supporting adsorbents to replace natural heulandite zeolites for removing metal ions from water.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Nanzhu Nie,Dan Zhang,Zuochao Wang,Shijie Ge,Yanli Gu,Bo Yang,Jianping Lai,Lei Wang
Achieving acidic seawater hydrogen production under commercial current densities remains a challenge. We present here a novel strategy through strong metal-support interaction (SMSI) and Pt-p-block alloys (PtM@CNT, M = Ga, In, Pb, and Bi) to construct a stable electronic perturbation and achieve acidic seawater hydrogen evolution performance at commercial current densities for the first time. SMSI stabilizes electronic perturbation and promotes durability up to 360 h. The optimized Pt 61 Ga 39 @CNT exhibits an overpotential of 18 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 and maintains 360 h stability at 500 mA cm −2 in acidic seawater. Density functional theory (DFT) calculation reveals that the optimized d -band center of Pt and ΔG H* increase the catalytic activity, and the higher vacancy formation energy enhances the durability. Overall, this discovery not only first achieves stable acidic seawater hydrogen production under commercial current densities, but also opens a new opportunity to explore catalytic applications of p-block alloys and SMSI stabilized electronic perturbation.
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ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200793
·
IF 9.14
Yanmei Guo,Jinxi Chen,Yixin Zhao,Yongbing Lou
Graphical Greener approach to toluene oxidation : Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite quantum dots (QDs) are anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing surface passivation and suppressing optical decay. Additionally, the novel composites as photocatalysts are used to drive the oxidation of toluene and demonstrate astonishing conversion rates with high selectivity. All-inorganic metal halide perovskite quantum dots (QDs) have attracted attention from researchers with their fascinating optoelectronic properties. However, blue-emitting perovskite QDs typically have low photoluminescence quantum yield (PLQY). For potential commercial applications, it is preferable to replace Pb with an element having low toxicity. Here, Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite QDs were anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing efficient surface passivation and suppressing optical decay. Compared to unanchored QDs, Cs 3 Bi 2 Br 9 @BiOBr QDs/A−SiO 2 composites exhibited significantly enhanced blue emission performance, the PLQY of which increased from 16.62 % to 77.26 %, in addition to good water and environmental stability. Finally, the novel composites as photocatalysts were used to drive the oxidation of toluene, a template reaction of C(sp 3 )−H bond activation and demonstrated astonishing conversion rates (4317 μmol g −1 h −1 ) with high selectivity (around 87 %).
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PubMed
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Zhilin Yang,Tao Yang,Yuebei Yang,Xiaoyun Yi,Xinrui Hao,Tian Xie,Chang Jun Liao
Adsorption has been deemed as one of the most efficient technologies for the removal of heavy metals from water because of its diversity of adsorbents, low cost, and simple operation. In this study, acrylic acid underwent free radical polymerization in an aqueous solution of lignocellulose extracted from peanut shells (PS) to form a porous double network hydrogel adsorbent, PS(H)-PAA. The PS(H)-PAA hydrogel had high water permeability and a porous network structure, which could provide a fast channel for metal ions diffusion from solution into hydrogel and gave rise to good adsorption performance. The adsorption process of heavy metal ions on the PS(H)-PAA hydrogel was identified to be a spontaneous endothermic adsorption and reached kinetic equilibrium within only 10 min for Pb(II) and 60 min for Cd(II) at an initial concentration of 100 mg/L using 0.5 g/L of adsorbent. According to a Langmuir model, at T =313 K the maximum theoretical adsorption capacities were as high as 250.42 and 109.89 mg/g for Pb(II) (pH 5) and Cd(II) (pH 6), respectively. Moreover, a PS(H)-PAA hydrogel showed good adsorption performance over a pH range of 4–9. The surface properties, dimensional morphology, and thermal stability of the adsorbents were characterized with Fourier transform infrared spectroscopy, scanning electron microscopy, and derivative thermogravimetry. The adsorption behavior under different conditions (such as pH, contact time, ion strength, and interfering ions) and the adsorption mechanism were studied. The adsorption mechanism indicated that oxygen- and nitrogen-containing functional groups play a major role in the adsorption process, primarily through chemical interactions, and secondarily through physical interactions. In addition, these adsorbents exhibited strong chemical stability, had very high swelling ratios in water, and could be recycled easily. These results indicate the developed PS(H)-PAA hydrogel is an environmentally friendly and potentially effective adsorbent for the removal of heavy metals.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zulfiqar Ali,Yang-wen Wu,Yue Wu,Zulqarnain Arain,Ming-xin Xu,Qiang Lu,Heping Ma,Huan-yu Zhao
Lead (Pb) species are inescapable constituents of the flue gas from coal-fired power plants and other thermal devices, which can cause impeding effects on the selective catalytic reduction (SCR) reactions. Here, the poisoning effects of Pb on the V 2 O 5 -MoO 3 /TiO 2 type SCR catalyst were examined. The poisoned catalysts were prepared by the solid diffusion and incipient wetness impregnation (IWI) methods. The catalytic activity tests indicated that the Pb-doped catalyst prepared by the IWI method suffered a considerable drop in catalytic activity, while a slender influence was observed on the Pb-loaded catalysts prepared by solid diffusion method. Comprehensive characterizations and density functional theory (DFT) calculations were performed on the fresh and poisoned catalysts prepared by the IWI method to unveil the deactivation mechanism. The results showed that Pb species covered the active sites (V species) on the catalyst surface, resulted in the decrease in chemisorbed oxygen, hence reducing the surface acidities. The decrease in reducibility of the catalyst was an important factor for poisoning of the catalyst. Moreover, Pb species reacted with MoO 3 to form PbMoO 4 which agglomerated on the catalyst surface to further deactivate the catalyst.
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BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Shuaizhong Zhang,Chengzhen Liu,Yongkai Yuan,Minghao Fan,Dandan Zhang,Dongfeng Wang,Ying Xu
A novel macroporous (~150 μm) double network hydrogel (TR/PAA) was prepared from tea residue and acrylic acid, and its performance was systematically evaluated. The static adsorption experiments showed that gel exhibited high selectivity and adsorption capacity, ultrafast kinetics (~10 min) for Cr(III), Pb(II) and Fe(III). The adsorption behavior showed heterogeneous and chemisorption process adsorption capacities of 206.19, 253.16, and 94.88 mg g −1 for Cr(III), Pb(II) and Fe(III), respectively. In pluralistic systems, TR/PAA showed the adsorption order of Fe(III) > Cr(III) > Pb(II). Mechanism studies confirm that nitrogen and oxygen-containing functional groups play a major role in the adsorption process. In the fixed-bed column experiments, the treatment volume of simulated wastewater reached 1400 bed volumes (BV) (21.6 L), producing only 7 BV (323 mL) eluent. This work provides a new avenue for the combination of TR/PAA reuse and heavy metal removal, which is expected to be applied in actual wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Liu,Qiang Gao,Chen Li,Shu Liu,Kaisheng Xia,Bo Han,Chenggang Zhou
Adsorption using monolithic adsorbents is an attractive emerging technology for water treatment, but it still remains a great challenge to facilely combine microscopically a well-developed surface functionality with a macroscopic architecture. In this work, we reported a simple, low-cost, and effective method for constructing uniform coating of crosslinked polyethyleneimine (PEI) on monolithic melamine sponge (MS) through pre-modification with polydopamine (PDA), followed by a rotary evaporation-driven “crosslinking–surface deposition” process. Due to the amine groups-rich surface and highly open porous structure, the resulting monolithic adsorbent (PEI@PDA/MS) exhibited high adsorption capacities and fast adsorption kinetics toward Pb(II) (231.81 mg g −1 ; < 100 min) and acid red 18 (AR18, 464.53 mg g −1 ; < 180 min). Moreover, PEI@PDA/MS possessed excellent shape memory property and could be manually collected with tweezers, indicating its great operational convenience in recycling. Cyclic adsorption/desorption experiments confirmed its satisfying reusability. Continuous flow adsorption behaviors of the PEI@PDA/MS monolith were further investigated by directly using it as stationary phase, which also exhibited high removal efficiencies for Pb(II) and AR18. Besides, adsorption mechanisms based on the characterization analyses were also proposed. Our study provides an effective strategy for fabricating high-quality PEI-based monolithic adsorbents with great potential to be used in environmental remediation.
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Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Youning Chen,Wei Zhao,Huan Wang,Xiaohua Meng,Linjie Zhang
A novel polyamine-type starch/glycidyl methacrylate (GMA) copolymer with a high capacity for the adsorption of heavy metal ions was prepared via graft copolymerization of GMA and corn starch and a subsequent amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The copolymers were characterized by Fourier transform infrared spectrometry, X-ray diffraction and scanning electron microscopy, and adsorption properties on modified starch of Cu(II), Pb(II), Cd(II) and Cr(III) were studied. By analysing the relationship between adsorption capacity and pH, adsorption isotherms and adsorption kinetics, it is proved that the adsorption of the four metal ions is mainly based on the chemical adsorption of coordination. The maximum adsorption capacities of the copolymer were up to 2.33, 1.25, 0.83 and 0.56 mmol g−1 for Cu(II), Pb(II), Cd(II) and Cr(III), respectively. The adsorption of the four concerned metal ions was hardly affected by common coexisting ions such as Na(I), K(I), Ca(II) and Mg(II), whereas it was slightly decreased when Fe(II) and Zn(II) coexisted in the solution, which illustrates the selective adsorption of Cu(II), Pb(II), Cd(II) and Cr(III) from wastewater. After 10 cycles of adsorption–desorption experiments, there was no significant change in the adsorption capacity, indicating that the polyamine-type starch/GMA copolymer has high adsorption capacity and good reusability.
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高影响因子
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