APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Shuying Shi,Chonghe Xu,Qing Dong,Yuping Wang,Silun Zhu,Xiaoqian Zhang,Yuk Tak Chow,Xinqiang Wang,Luyi Zhu,Guanghui Zhang,Dong Xu
The functionalized MnO 2 /PDA/Fe 3 O 4 fibers were synthesized to removal Pb(II) from wastewater. MnO 2 nanosheets were in-situ loaded on the high saturation magnetization Fe 3 O 4 fibers matrix through a polydopamine (PDA) intermediate platform. The high Fe 3 O 4 content enabled the composite fibers to achieve rapid magnetic separation. The perpendicularly orientated MnO 2 nanosheets coated on the fibers could avoid agglomeration and give full play to their outstanding adsorption performance. The maximum Pb(II) adsorption capacity at 300 K, 308 K and 318 K calculated by Langmuir model could reach 196.67, 200.45 and 205.07 mg/g, respectively; all of which were higher than those of most reported MnO 2 based adsorbents. Thermodynamics showed that the fibers had spontaneously physicochemical adsorption of Pb(II). The composite fibers adsorbents had excellent Pb(II) selective adsorption and reusability. In addition, under the laboratory simulation test conditions, the fibers exhibited an excellent Pb(II) treated capacity of ~2500 and 6500 kg wastewater per kg adsorbents. This could dramatically purify wastewater from 10 mg/L to below 0.01 mg/L and 0.1 mg/L. The prepared MnO 2 /PDA/Fe 3 O 4 fibers had excellent adsorption capacity and actual treated capability for Pb(II), which could bring about rapid magnetic separation and offer great application potential in Pb(II) adsorption removal.
研究领域:
环境科学
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材料科学
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水处理技术
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吸附材料
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纳米复合材料
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DOI
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
International Journal of Electrochemical Science
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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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huanghui Nie,Limei Ruan,Lu Hu,Xinran Wang,Fukang Chen,Shuai Zhou,Yangyang Wang,Taotao Ai,Yan Yan,Gang Liu
(1- x ) (0.98Na 0.5 Bi 0.5 TiO 3 –0.01BaTiO 3 –0.01BiFeO 3 )– x CaTiO 3 (NBB- x CT) ceramics were produced using traditional solid-state synthesis methods. The surface morphology , domain structure, and electrical properties of the ceramic samples were systematically studied. In addition, the temperature and frequency stabilities of the NBB-15CT sample at 200 kV/cm were tested. Generally, NBB- x CT ceramics exhibit a typical single perovskite phase structure. The results indicate that the NBB-15CT ceramics showed a high energy density of 3.14 J/cm 3 at 250 kV/cm. The piezoresponse force microscopy (PFM) results showed that the addition of CT broke the macrodomains of the 0.98Na 0.5 Bi 0.5 TiO 3 -0.01BaTiO 3 -0.01BiFeO 3 ceramic and helped to form nanodomains, leading to an improved energy storage performance. The above performance indicates that the specimens possess very good temperature-and frequency-dependent energy storage performances at 30–150 °C and 1–100 Hz. Moreover, the electric energy storage and release in the NBB-15CT ceramic indicated that the power density could reach 55.30 MV/cm 3 at 180 kV/cm. Therefore, the NBB-15CT ceramic is a promising material for electrical capacitors.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Yanzhao Shi,Xueying Ren,Hong Zheng,Yu Zhang,Qi Zuo
The removal of lead in drinking water has attracted considerable attention of researchers in recent years, especially, the trace characteristic of lead is a challenge to water treatment. Herein, 13X zeolite/reduced graphene oxide composite material (13X-rGO) with hierarchically porous structure was successfully prepared using graphene oxide (GO) and 13X zeolite via a chemical reduction method and presented great performance for removing trace Pb(II) from drinking water. The influence of some important parameters including adsorbent dosage, contact time, initial lead concentration, coexisting competing ions, solution pH value, etc. on the removal of Pb(II) was systematically investigated. The composite material showed better adsorption properties compared with a single component and their physical mixture, confirming the synergistic effect of rGO and 13X zeolite on Pb(II) adsorption. The effluent lead concentration could be decreased to the level permitted by World Health Organization (WHO) (<10 ppb) within 30 s under calcium content of 20 ppm and initial lead concentration of 150 ppb. Simultaneously, the as-prepared 13X-rGO performed excellent adsorption capacity meeting WHO standard (6.07 mg/g), which was about 2.23 times that of single 13X zeolite (2.72 mg/g). In the presence of interfering ions, the lead concentration could still be reduced to safe drinking water standard. Moreover, the adsorbent could be effectively regenerated by saturated sodium chloride solution. Therefore, 13X-rGO can be introduced as a promising adsorption material for the purification of drinking water contaminated with trace lead owing to rapid adsorption, low cost and recycling potential.
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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
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2024
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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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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yuehui Tan,Xirui Wan,Ting Zhou,Le Wang,Xianqiang Yin,Aisheng Ma,Nong Wang
In this study, a novel adsorbent made from kiwi branch biochar modified with Zn-Fe (KB/Zn-Fe) was compared with original biochar to the Pb(II)'s adsorptivity from waste water. The adsorbent was synthetized by liquid-phase deposition. Batches of sorption tests were performed, and the biochars' representative properties were tested. Characterizations revealed the physicochemical properties of biochars and showed that the KB/Zn-Fe composites were successfully synthesized. The Langmuir model and pseudo-second-order kinetic model were proven to satisfactorily fit the original biochar and KB/Zn-Fe. The KB/Zn-Fe showed Langmuir maximum adsorption ability to Pb (II) in aqueous solution of 161.29 mg g -1 , compared with 36.76 mg g -1 for original biochar. The adsorption ability of Pb(II) decreased and the Pb(II) removal efficiency increased with increasing biochar dose. The effect of co-existence of NO 3 - to the absorptive capacity of KB/Zn-Fe on Pb(II) was unremarkable, but Cl - could increase the absorptive capacity. Multiple Pb(II) adsorption mechanisms by KB/Zn-Fe include surface precipitation of metal hydroxides, complexation with active functional groups and ion-exchange. This work provides guidance for future production of biochar with efficient adsorption ability, which could be used to remove Pb(II) ions from wastewater.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Can Cui,Xiaohuan Sun,Chuanqiang Zhou,Yingwei Liu,Huixin Xiong,Yanan Li,Jie Han
Pomegranate-like MnO 2 @polyaniline (PANI) sub-microspheres have been designed and successfully synthesized as a novel and highly effective sorbent material to remove heavy metal ions from water. Herein, pomegranate-like SiO 2 @PANI spheres were firstly fabricated by performing the oxidation polymerization of aniline in silica colloidal solution, followed by the removal of SiO 2 and in situ redox reaction between KMnO 4 and PANI . Compared with the mono-component PANI and MnO 2 materials, the obtained pomegranate-like MnO 2 @PANI sub-microspheres exhibited superior adsorption ability towards Pb(II) ions due to the synergistic effect. Influencing factors, including pH, Pb(II) ions concentration, adsorbents content and other ions on the Pb(II) ion sorption onto the MnO 2 @PANI hybrid were systematically studied. The sorption isotherm, kinetics and thermodynamic properties of the hybrids for Pb(II) ions adsorption were reflected by different models. Moreover, the adsorption ability of pomegranate-like MnO 2 @PANI sub-microspheres towards other heavy metal ions was also explored. This work would provide new insight on the design of hierarchical inorganic/organic nanosorbent.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Daixiong Zhang,Qing Xiang
In this work, a Sn-Bi film was successfully fabricated via the electrophoretic deposition (EPD) of nano-Sn powders and nano-Bi powders in an ethanol dispersion medium. Study on film composition showed that a coefficient of proportionality between the mass ratio in the deposited film and that in the suspension was observed for the EPD of Sn-Bi, which controlled the composition of the Sn-Bi film. Therefore, Sn-Bi films with different mass ratios were designed with this linear relationship for the codetection of Cd(II) and Pb(II). Square-wave anodic stripping voltammetry (SWASV) measurements using an in-situ plating strategy were performed after the electrochemical oxidation of Sn and Bi at 0.3 V for 120 s, and the results indicated that the Sn-Bi film with a mass ratio of 0.75 had the best determination ability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 10
·12648-12658
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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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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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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高影响因子
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