CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haochen Sun,Yingzhi Meng,Feifei Han,Silin Tang,Xiuyun Lei,Qingqing Ke,Dingyuan Wang,Yisong Bai,Biaolin Peng,Xue Chen,Xiang Niu,Shengguo Lu,Laijun Liu
Electrocaloric refrigeration technology has garnered significant attention due to its potential for next-generation solid-state cooling, which is miniaturized and efficient. However, achieving a substantial electrocaloric effect (ECE) and a wide working temperature range at low electric fields remains a challenge. In this study, a synergistic approach combining domain and defect engineering was used in transparent 0.88 Pb(Mg 1/3 Nb 2/3 )O 3 -0.12PbTiO 3 - x Sm(0.88PMN-0.12 PT- x Sm) ceramics to improve ECE and temperature stability. Finally, a notable adiabatic temperature change ( ΔT ) of 2.07 K in the x = 0.01 ceramic, with ΔT exceeding 1.0 K across a broad temperature range from 30 to 180 °C was achieved. Piezoresponse force microscopy (PFM) and X-ray photoelectron spectroscopy revealed the presence of small domains and appropriate oxygen vacancies as contributors to the enhanced ECE and broad operation temperature range. This work introduces a promising candidate material for electrocaloric refrigeration.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 12
·696
·
IF 3.5
Li Lanlan,Wang Zili,Wang Guanghui,Zhang Xuewen,Deng Nansheng
Widespread contamination by Pb(II) and Cd(II) poses persistent environmental and public health risks, while achieving selective removal with a clear mechanistic understanding in multicomponent systems remains challenging. Herein, a MgFe-MoS₄-LDH/BC hybrid composite was synthesized via co-precipitation followed by MoS₄ 2 ⁻ intercalation to regulate interlayer chemistry and introduce sulfur-based active sites. Adsorption kinetics followed a pseudo-second-order model, and equilibrium data were well described by the Langmuir model, indicating dominant chemisorption. Under optimized conditions (C₀- Pb = 100 mg/L, C₀- Cd = 20 mg/L, pH = 6.0, dosage = 0.2 g/L), the composite achieved removal efficiencies of 99.53% for Pb(II) and 85.71% for Cd(II). In binary systems, Pb(II) showed stronger competitive behavior, exhibiting only a 4.7% capacity reduction compared to 9.4% for Cd(II). Thermodynamic analysis confirmed that adsorption was spontaneous and endothermic. Combined XRD, FTIR, XPS, and density functional theory (DFT) analyses revealed that metal immobilization was governed by complexation with oxygen- and sulfur-containing groups, surface precipitation (Pb₂(SO₄)O and Cd(OH)₂), and electrostatic attraction. DFT calculations further demonstrated stronger Pb–S interactions, explaining preferential Pb(II) adsorption. The composite maintained high stability after five regeneration cycles, and key scientific challenges and future innovation pathways are summarized to guide practical application. This work provides a rational strategy for designing selective LDH-based composites for heavy-metal remediation.
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FOOD CONTROL
·
2021
·
IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 12
·6540
·
IF 5.924
Xu Zhang,Tao Du,He Jia
In this study, four different coal fly ashes (CFAs) were used as raw materials of silica and alumina for the preparation of the alumina-containing Mobil Composition of Matter No. 41 (Al-MCM-41) and the exploration of an activation strategy that is efficient and universal for various CFAs. Alkaline hydrothermal and alkaline fusion activations proceeded at different temperatures to determine the best treatment parameters. We controlled the pore structure and surface hydroxyl density of the CFA-derived Al-MCM-41 by changing the crystallization temperature and aging time. The products were characterized by small-angle X-ray diffraction, nitrogen isotherms, Fourier-transform infrared spectroscopy,29Si silica magic-angle spinning nuclear magnetic resonance, and transmission electron microscopy, and they were then grafted with thiol groups to remove Pb(II) from aqueous solutions. This paper innovatively evaluates the CFA activation strategies using energy consumption analysis and determines the optimal activation methodology and parameters. This paper also unveils the effect of the crystallization condition of Al-MCM-41 on its subsequent Pb(II) removal capacity. The results show that the appropriate selection of crystallization parameters can considerably increase the removal capacity over Pb(II), providing a new path to tackle the ever-increasing concern of aquic heavy-metal pollution.Keywords:coal fly ash;CFA activation;Al-MCM-41;crystallization parameters;Pb(II) removal capacity
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高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·375-387
·
IF 2.394
Wei Shou-lian,Yan Liang-jie,Huang Xiang-jin,Li Jian-wen,Yao Su,Zhang Hua-sheng,Xu Ai-zhen
This work describes the development of a simple, effective, and sensitive electrochemical sensor based on a glassy carbon electrode (GCE) modified with carboxylated carbon nanosheets (cCNSs) and poly(glutamic acid) (PGA) for the simultaneous detection of trace amount of Cd(II) and Pb(II) by differential pulse anodic stripping voltammetry (DPASV). The cCNSs were introduced to increase the effective surface area and electron transport efficiency of the sensor, while PGA acting as a capturer could capture target metal ions and eventually enhance the selectivity and sensitivity in the detection of Cd(II) and Pb(II). The designed sensor showed a linear range of 1.0–100.0 μg/L for both metal ions, with detection limits (S/ N = 3) of 0.13 μg/L for Cd(II) and 0.15 μg/L for Pb(II), respectively. The sensor was applied to the simultaneous detection of Cd(II) and Pb(II) in the water and rice samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry (GFAAS). It also gave excellent performance with regard to its selectivity, recovery, stability, and reproducibility.
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Materials Research Express
·
2019
·Vol. 6
·期 9
·095315
·
IF 1.449
Huining Zhang,Qing Chang,Jianping Han,Shiming Gao,Zhiguo Wu,Jiawei Hu,Yahong Yang,Zhiqiang Wei,Dengqi Zhang,Zhangpu Peng
In this work, two novel macroporous hydrogel beads (PVA/GO–N and PVA/CS) were prepared to remove Cu2+ and Pb2+ ions in the solution. The maximum Cu2+ sorption capacities on PVA/GO–N and PVA/CS beads were 96.22 and 74.66 mg g−1, while the counterpart sorption capacities of Pb(II) were 278.16 and 144.53 mg g−1, respectively. Isotherm, kinetics and XPS analysis investigation indicated that the sorption processes were controlled by multiple mechanisms. The Cu(II) and Pb(II) removal rates were influenced by the changes of pH, initial dosage, ionic strength, chelator and co-existed ions. The packed-bed sorption column experiments were also carried out to investigate the operating parameters and the potential of the two adsorbents in large scale adsorption systems in practical use. The kinetic model, Thomas equation, was applied to predict dynamic behavior of the fixed bed column for a successful design of a sorption column.
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ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2022
·Vol. 194
·期 5
·1-10
·
IF 3.307
Yang Nan,Ge Zhimeng,Li Aihong,Wei Baiyong,Li Yinming,Zhang Ye,Shen Qianjin,Wang Tuqiang,Wu Xueqian,Cao Xiangdong,Guo Jianping,Wang Zhaojia
The municipal solid waste incineration (MSWI) fly ash has been a major problem with the rapid development of the cities in China. And the cement rotary kiln co-processing technique is accepted as an effective method to dispose detrimental heavy metals in MSWI fly ash. This study focused on presented the total leaching content and the morphological distribution of the heavy metals in cement solid samples doped with MSWI fly ash. These samples were collected from a MSWI fly ash co-processing cement rotary kiln plant. The leaching test and the sequential extraction procedure were adopted to measure the migration characteristic of As, Pb, Cu, and Zn. In addition, the leachability of clinker samples under different simulated environmental conditions was also detected to analyze the security of the cement product doped with MSWI fly ash. This work demonstrates the feasibility of the cement rotary kiln MSWI fly ash co-processing technique and provides a scientific guidance to related plant.
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高影响因子
JOM
·
2022
·Vol. 75
·期 5
·1515-1529
·
IF 2.597
Ge Yang,Liu Zhihong,Yu Zhiqian,Wang Huanwen,Lu Xingwu,Zhang Leru,Xia Longgong
The present study focused on the Cu-Pb system and investigating the distribution behaviors of various minor elements through the equilibration-quenching-EPMA analysis experimental technique. Obtained results showed that: (1) An intermetallic compound consisting mainly of Cu-Pb-Se-Te formed below 956°C. (2) As, Sb and Sn had similar distribution behaviors, which mainly entered the solid Cu phase at the temperature range of 500–900°C, but became concentrated in the liquid alloy phase at temperature range of 900–1060°C, and their distribution ratios increased along with increasing temperature. (3) Bi was mainly found in the liquid alloy phase, and its distribution ratio ranged from 6.8 to 836.5 at the experimental conditions. (4) Se and Te formed an intermetallic alloy phase under 900°C, and they enriched in the liquid alloy phase between 960°C and 1060°C. (5) Au was mainly found in the solid Cu phase at the temperature range of 500–900°C, and its distribution ratio was about 1.5 at 900–1060°C. The distribution ratio of Ag decreased from 8.7 to 2.3 when increasing the temperature from 500°C to 1060°C. Distribution behavior of As, Sb, Bi and Sn is consistent with their interfacial enthalpies with Cu and Pb.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Wang,Shuai Wang,Shixing Wang,Likang Fu,Libo Zhang
The removal of Cr(VI) and Pb(II) from wastewater is one of the methods to ensure water safety. However, it is still a difficult point to design efficient and selective adsorbent. In this work, Cr(VI) and Pb(II) were removed from water by a new metal–organic frameworks material (MOF-DFSA) with numerous adsorption sites. The max adsorption capacities of MOF-DFSA were 188.12 mg/g for Cr(VI) after 120 min and 349.09 mg/g for Pb(II) within 30 min. MOF-DFSA showed good selectivity and reusability after four cycles. The adsorption of MOF-DFSA was an irreversible process with multi-site coordination, and an active site adsorbed 1.798 Cr (VI) and 0.395 Pb (II). Kinetic fitting showed that the adsorption was chemisorption and surface diffusion was the main limiting step. Thermodynamic showed that Cr(VI) adsorption was enhanced at higher temperatures by spontaneous processes while Pb(II) was weakened. The chelation and electrostatic interaction of the hydroxyl and nitrogen-containing groups of MOF-DFSA with Cr(VI) and Pb(II) is the predominant mechanism, while the reduction of Cr(VI) also play an important role in adsorption. In conclusion, MOF-DFSA was a sorbent that can be used for the removal of Cr(VI) and Pb(II).
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
An Wang,Meiling Wu,Zhongyuan Li,Yuqiang Zhou,Fanmin Zhu,Zhanbin Huang
This study utilized discarded steel slag (SS) as raw material and prepared modified steel slag materials (SS-SBC, SS-NBC, SS-BHA) through modification with biomass materials such as straw biochar (SBC), nutshell biochar (NBC), and biochemical humic acid (BHA). These materials were then applied for the removal of Pb from both solution and soil. The physical and chemical properties of the materials were analyzed using characterization techniques such as SEM, EDS, XRD, and BET. The specific surface area of the modified materials increased from the original 3.8584 m 2 /g to 34.7133 m 2 /g, 181.7329 m 2 /g, and 7.7384 m 2 /g, respectively. The study then explored the influence of different adsorption conditions on the adsorption capacity of Pb in solution, determining the optimal conditions as follows: initial concentration of 200 mg/L, adsorbent mass of 0.04 g, temperature of 15 °C, and pH = 2. To further investigate the adsorption process, kinetic and isotherm models were established. The results indicated that the adsorption process for all three materials followed a pseudo-second-order kinetic model and Freundlich isotherm model, suggesting a multi-layer chemical adsorption. Thermodynamic analysis revealed that the adsorption process was an exothermic spontaneous reaction. Soil cultivation experiments were conducted to explore the effects of different material addition amounts and cultivation times on the passivation of Pb-polluted soil. Analysis of heavy metal forms in the soil revealed that the addition of modified materials reduced the acid-extractable form of Pb in the soil and increased the residual form, which is beneficial for reducing the migration of Pb in the soil. FT-IR and XPS analyses were employed to study the functional groups, element composition, and valence states before and after adsorption passivation of Pb by the three materials. The results confirmed that the adsorption mechanisms of SS-SBC, SS-NBC, and SS-BHA mainly involved electrostatic adsorption, ion and ligand exchange , and surface precipitation. This study not only provides a new material for adsorbing and immobilizing heavy metals in soil and water but also offers a new approach for the resource utilization of steel slag waste.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Qin Tao,Tianwen Liu,Mengyao Si,Tingting Zhang,Qiu Jin,Xiaoying Wang
The simultaneous presence of heavy metal ions (HMIs) such as Pb²⁺ and Hg²⁺ pose severe risks to food safety, particularly in aquatic products. Herein, a ratiometric electrochemical aptasensor integrated with magnetic separation-assisted entropy driven catalyst (EDC) was developed for simultaneous detection of Pb²⁺ and Hg²⁺. In this work, Fe@ZIF67-NH₂, an iron-doped zeolitic imidazolate framework, as both an electrode modifier and an internal reference, providing stable electrochemical signals and enhanced surface area. Herein, we utilized Fe@ZIF67-NH₂ (an iron-doped zeolitic imidazolate framework) as both an electrode modifier and an internal reference to provide stable electrochemical signals and increase the surface area. Dual EDC reactions amplified Pb²⁺ and Hg²⁺ signals independently, while magnetic separation isolated carbon dots (CDs) labelled DNA strands (CDP-D1 and CDH-P1) from interference strands, minimizing background noise. The sensor demonstrated wide linear ranges of 0.2-2.0×10⁴ ng mL⁻ 1 for Pb²⁺ and 0.1-1.0×10⁴ ng mL⁻ 1 for Hg²⁺, with detection limits of 0.1 ng mL⁻ 1 and 0.03 ng mL⁻ 1 , respectively. Practical validation using dried seafood samples showed recovery rates of 96.4-107.0% and relative standard deviations (RSDs) < 6.60%, and were consistent with inductively coupled plasma mass spectrometry (ICP-MS). This work presents a highly amplification-efficient and sensitive strategy for multiplex HMI detection in complex matrices, offering significant potential for food safety monitoring and environmental analysis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 11.3
Pingxiu Zeng,Zhenzhen Ma,Hongmei Hu,Meiying Ye,Yuanchao Wang,Heyong Cheng
Species-specific toxic, metabolic, and bioavailable properties of commonly coexisting metal(loid)s—particularly Cr, As, Cd, Hg, and Pb—necessitate their speciation analysis. Because of the complexity and diversity in chemical form, concentration (from picograms to milligrams per liter), interactions, and sample matrix, multi-elemental speciation methods are preferred over traditional mono-elemental speciation methods. However, current multi-elemental speciation methods have primarily associated with only two metal(loid)s. Herein, we developed an efficient, sensitive, inexpensive, and green methodology for the simultaneous penta-elemental speciation analysis of Cr, As, Cd, Hg, and Pb using high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry and online solid-phase extraction (SPE) preconcentration. Food samples were extracted with a mixture of 0.1 M HNO 3 and 5 mM L -cysteine (Cys), chosen among 10 extractants for its good extraction efficiency, low noise, and minimal chromatographic interference. The proposed method offered a short analysis time (10 min for separation and 2 min for enrichment), excellent linearity (R 2 > 0.995), low detection limits (0.02 −0.12 μg L −1 in SPE-free mode; 0.02 −3.2 ng L −1 with online SPE), high precision (0.2 −2.4 %), and good recovery (81 −117 %) using an aqueous mobile phase of 5 mM tetrabutylammonium hydroxide + 5 mM Cys (pH 4.7). This demonstrates its good applicability to both food and water samples. Despite the incompatibility of Cr(VI) with As(III) and Cys, the proposed method excels in analytical, economic, and environmental aspects (maximizing the number of metal(loid)s within minimized analytical time using aqueous mobile phases), showing significant potential for a wide range of food, environmental, and biological samples.
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高影响因子
危险品化学品经营许可证（带存储）