CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Ting-Ting Zhang,Jing-Yang Jiang,Yan-Hua Wang
Various supported Pt-Pb bimetallic catalysts were prepared and applied for the catalytic conversion of nitrobenzene to p -aminophenol in the environmentally benign pressurized CO 2 /H 2 O system. Among the bimetallic catalysts prepared, Pt-Pb/SiO 2 is the best and nitrobenzene could be converted to p -aminophenol with a selectivity as high as 82% when the reaction was carried out using this catalyst at 110 °C under 5 MPa CO 2 and 0.2 MPa H 2 .
研究领域:
催化
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化学工程
·
环境化学
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产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 9
·264
·
IF 3.6
Shuhang Lu,Qianhui Xu,Mei-Ling Liu,Dong Zou,Guangze Nie
The efficient purification of Pb(II)-containing wastewater is essential for safeguarding public health and maintaining the aquatic environment. In this study, novel hydrous ferric oxide (HFO) nanoparticle-embedded poly(vinylidene fluoride) (PVDF) composite adsorption membranes were developed through a simple blending method for efficient Pb(II) removal. This composite membrane (denoted as HFO-PVDF) combines the excellent selectivity of HFO nanoparticles for Pb(II) with the membrane’s advantage of easy scalability. The optimized HFO-PVDF(1.5)membrane achieved adsorption equilibrium within 20 h and exhibited excellent adsorption capacity. Moreover, adsorption capacity markedly enhanced with increasing temperature, confirming the endothermic nature of the process. The developed HFO-PVDF membranes demonstrate significant potential for real-world wastewater treatment applications, exhibiting exceptional selectivity for Pb(II) in complex ionic matrices and could be effectively regenerated via a relatively straightforward process. Furthermore, filtration and dynamic regeneration tests demonstrated that at an initial Pb(II) concentration of 5 mg/L, the membrane operated continuously for 10–13 h before regeneration, treating up to 200 L/m2of wastewater before breakthrough, highlighting potential for cost-effective industrial wastewater treatment. This study not only demonstrates the high efficiency of the HFO-PVDF membrane for heavy metal ion removal but also provides a theoretical foundation and technical support for its practical application in water treatment.
研究领域:
环境科学
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水处理
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材料科学
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化学工程
·
吸附技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Ping Sun,Wei Zhang,Binze Zou,Lincheng Zhou,Zhengfang Ye,Quanlin Zhao
Attapulgite (ATP) has a unique porous layered chain structure and is an excellent environment-friendly decolorizer. However, its high viscosity makes it difficult to separate. First, it was combined with magnetic Fe 3 O 4 nanoparticles to obtain Fe 3 O 4 -ATP that is easy to recycle and reuse. Then, Fe 3 O 4 -ATP nanoparticles were embedded in chitosan (CS) gel beads, and glutaraldehyde was used for cross-linking and curing. Lastly, ethylenediaminetetraacetic acid (EDTA) was successfully connected to Fe 3 O 4 -ATP/CS gel beads through amidation reaction, which further increased the capability of the adsorbent to adsorb heavy metal ions. The prepared magnetic composite adsorbent is a sphere with a rough surface and porous structure. The maximum adsorption capacity of the prepared Fe 3 O 4 -ATP/EDTA/CS adsorbent for Pb(II), Cu(II), and Ni(II) is 368.32, 267.94, and 220.31 mg g −1 , respectively. After 5 times of repeated use, Fe 3 O 4 -ATP/EDTA/CS still showed good adsorption capacity for Cu(II), Pb(II), and Ni(II). Fe 3 O 4 -ATP/EDTA/CS has a large adsorption capacity for heavy metal ions, a wide pH applicability, good reuse, and rapid magnetic separation. In addition, Cu(II) loaded Fe 3 O 4 -ATP/EDTA/CS also showed good catalytic degradation performance for bisphenol A. This study prepared a new type of adsorbent with good adsorption performance and provided a promising method for the treatment of wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
BRAIN RESEARCH BULLETIN
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2022
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IF 3.715
Lin Bai,Yingying Wu,Ruike Wang,Rundong Liu,Mengchen Liu,Qiong Li,Yue Ba,Huizhen Zhang,Guoyu Zhou,Fangfang Yu,Hui Huang
As a ubiquitous toxic heavy metal, lead (Pb) exposure is known to be implicated in the onset and development of neurodegenerative diseases which may cause more serious health hazards with age and the accumulation of Pb in the body. Autophagy is the main degradation route for abnormal aggregated proteins and damaged cell organelles. Here, we aimed to study the effects of adolescent Pb exposure on autophagy at different life nodes. In this study, we developed a time-series model of Pb exposure in mice and randomly divided 4-week-old male C57BL/6 mice into six groups (4 C, 13 C, 16 C, 4Pb, 13Pb and 16Pb). Mice in Pb groups was consumed deionized water containing 0.2 % Pb(Ac) 2 for 3 months and then reared to anticipated life nodes, while the control group consumed deionized water. Western blot and Real-time qPCR were used to assess the effects of developmental Pb exposure on individual components of the autophagy machinery and modulation of microtubule-associated protein 1 light chain 3 (LC3) at each age stage. Our results showed that Pb exposure during adolescence reduced the p-mTOR/mTOR ratios with enhanced expression of Beclin-1, Atg12 and Atg7in both the hippocampus (HPC) and prefrontal cortex (PFC) of senescent mice while upregulation of LC3II/LC3I ratios and p62 suggested that autophagy mediates degradation was interrupted. Overall, we confirm that Pb exposure during adolescence promotes autophagic processes in the aged mice brain and that autophagic degradation is hindered, ultimately leading to a failure of autophagic degradation.
研究领域:
毒理学
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神经科学
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分子生物学
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发育生物学
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衰老研究
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·
IF 3.3
Qingyuan Cheng,Liman Li,Mingxia Yu
Silver chalcogenide (Ag2X; X = S, Se, Te) quantum dots (QDs) have facilitated the biomedical applications of QDs due to their low toxicity and tunable emission reaching the second near-infrared window (NIR-II window, 1000–1700 nm). The photoluminescence intensity of Ag2S QDs and Ag2Se QDs is considerably enhanced via Pb doping. However, the developed Pb-doped Ag2S QDs lacked in vivo verification, and the toxicity of the Pb-doped Ag2X QDs was only preliminarily assessed. Although QDs containing Pb have been widely introduced into the field of biomedicine, there are still concerns regarding toxicity associated with Pb. In the present study, we prepared polyethylene glycol (PEG)-modified Pb-doped Ag2S QDs with better biocompatibility and tested their in vivo bioimaging and toxicity in comparison with Ag2S QDs modified with the same PEG under identical concentrations. Results indicated that the PEG-modified Pb-doped Ag2S QDs significantly enhanced the brightness of in vivo bioimaging and spatial resolution for vessels inside the tumor without increasing toxicity, assessed based on cell viability post incubation for 96 h, intracellular ROS level, DNA damage, early apoptosis and mitochondrial injury. Our study demonstrated that the PEG-modified Pb-doped Ag2S QDs could serve as an advanced fluorescent probe for various biomedical applications.
研究领域:
生物医学工程
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材料科学
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纳米技术
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毒理学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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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).
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 3
·2308341
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IF 19
Mingyang Li,Jindi Wang,Jisong Yao,Shalong Wang,Leimeng Xu,Jizhong Song
Although significant progress has been made in improving the external quantum efficiencies (EQEs) of perovskite quantum dot (QD) light-emitting diodes (QLEDs), understanding the degradation mechanism and enhancing stability remain a challenge. Herein, increasing the content of Br-based passivation ligands is shown to enhance the EQE up to 16.1% by reducing the defects of CsPbBr 3 QDs in a Br-rich environment. However, the operational lifetimes of perovskite QLEDs gradually decrease with the increase of halide content, owing to the intensified ion migration under continuous electric field confirmed by the current behavior of QLEDs and time-of-flight secondary-ion mass spectrometry. Furthermore, a thorough analysis of the relationship between electricity and luminance of QLEDs suggests that a small amount of residue oleic acid ligands could weaken ion migration. Accordingly, a halide- and acid-hybrid (HAH) co-passivation strategy is proposed to optimize the content of Br- and acid-based ligands, and achieve a maximum EQE of 18.6% and an operational lifetime ( T 50 , extrapolated) of 213 h for CsPbBr 3 QLEDs. This approach for passivating QDs combines the high efficiency of Br-based ligands with the improved stability of acid-based ligands. The study elucidates the correlation between ligands and device performance, highlighting the significance of two or even multiple ligands for efficient and stable perovskite QLEDs.
研究领域:
材料科学
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光电子学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 24
·1-13
·
IF 2.8
Rafiq Muhammad Nasir,Dai Zhonghua,Zheng Yuanyuan,Li Xujun,Liu Chenxi,Zhao Xin,Cong Yu,Gu Shuitao
The performance of lead-based ceramics in energy storage applications is often hindered by their low energy density and inadequate phase transition properties. The (Pb, La) (Zr, Sn, Ti)O 3 (PLZST) antiferroelectric ceramics have attracted much attention as energy storage materials. In this work, ceramics Pb 1−1.5 x La x (Zr 0.93 Sn 0.05 Ti 0.02 )O 3 at ( x = 0.015, 0.025, 0.035, and 0.045) were prepared using a solid-state method, and their dielectric and energy storage characteristics were studied. It was observed that integrating lanthanum significantly improved the perovskite structure, reducing grain size and boosting the polarization intensity. In this present study, a recoverable energy storage density ( W rec ) of 6.24 J/cm 3 was achieved under an electric field of 270 kV/cm. Moreover, these ceramics demonstrated an impressive discharge energy density ( W dis ), with 90% of the energy released within 1.29 μs. The outcomes show that PLZST is a highly effective material for advanced energy storage, pulse power applications, and paving the way for technological advancements.
研究领域:
材料科学
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陶瓷
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能量存储
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固体物理
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介电材料
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xuelin Wen,Fengjing Cao,Chongshan Yang,Zhen Gao,Hongwu Tian,Xiande Zhao,Lianbo Guo,Shixiang Ma,Daming Dong
The detection of heavy metals in tea infusions is important because of the potential health risks associated with their consumption. Existing highly sensitive detection methods pose challenges because they are complicated and time-consuming. In this study, we developed an innovative and simple method using Ag nanoparticles-modified resin (AgNPs-MR) for pre-enrichment prior to laser-induced breakdown spectroscopy for the simultaneous analysis of Cr (III), Cu (II), and Pb (II) in tea infusions. Signal enhancement using AgNPs-MR resulted in amplification with limits of detection of 0.22 μg L −1 for Cr (III), 0.33 μg L −1 for Cu (II), and 1.25 μg L −1 for Pb (II). Quantitative analyses of these ions in infusions of black tea from various brands yielded recoveries ranging from 83.3% to 114.5%. This method is effective as a direct and highly sensitive technique for precisely quantifying trace concentrations of heavy metals in tea infusions.
研究领域:
分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Kun Jiang,Kun Liu,Qian Peng,Muyang Zhou
Montmorillonite (MMT) and humus have a good adsorption effect on heavy metal ions . This study proposed a synthetic method for a novel composite of humus-like substances/MMT (HLS-MMT) by introducing humus precursors into the interlayer domain of MMT and then forming HLS through in situ catalytic polycondensation reaction. The structure and morphology of samples were characterized by XRD , FTIR, and SEM , which demonstrated the successful loading of HLS on the internal and external surfaces of MMT. The experimental results showed that the loading of HLS on MMT was very stable, and the adsorption capacity of the modified MMT for lead and zinc ions was greatly enhanced. The effects of single-factor experiments showed that the pH value was the key factor affecting the adsorption process . In addition, the adsorption process was found to be in good agreement with the Langmuir isotherm model and the pseudo-second-order kinetic model . The competitive adsorption experiment displayed that HLS-MMT had a higher affinity for Pb ions than Zn ions, and the cycling experiment presented that the adsorbent had good regeneration and cycling performance. This study shows that HLS-MMT is a novel adsorbent with a good capacity to separate and enrich Pb and Zn ions similar to ion-exchange resin.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 33
·18647-18655
·
IF 2.936
Xi Zhou,Xiaolin Lv,Wen Zhao,Tiantian Zhou,Shupeng Zhang,Zhan Shi,Shefang Ye,Lei Ren,Zhiwei Chen
This study reports a multifunctional core/shell nanoparticle (NP) that can be used for amplified magnetic resonance image (MRI), enhanced photothermal therapy (PTT) and magnetic hyperthermia therapy (MHT) due to its surface coating with a porous shell. Importantly, by means of introducing the surface coating of a porous shell, it helps entrap large quantities of water around NPs and allow more efficient water exchange, leading to greatly improved MR contrast signals. Besides, the porous shell helps the near-infrared (NIR) absorbance of the core, and then the extremely enhanced thermal effect can be obtained under synergistic combination of PTT and MHT. By synthesizing multifunctional porous MnFe2O4/PB as an example, we found that the transversal relaxivity (r2) of MnFe2O4 NPs might improve from 112.11 to 123.46 mM−1 s−1, and the specific absorption rate (SAR) of MnFe2O4/PB nanoparticles reached unprecedented levels of up to 4800 W g−1 compared with the SAR 1182 W g−1 of PTT under an 808 nm laser and 180 W g−1 of MHT under an external AC magnetic field. Meanwhile, when MnFe2O4 was decorated on PB nanoparticles, the magnetic properties became lower slightly, but the synergistic photothermal/magnetic hyperthermia conversion was enhanced greatly. Subsequently, in vitro T1–T2 dual-modal MRI, PTT and MHT results verified that MnFe2O4/PB could serve as an excellent MRI/PTT/MHT theranostic agent. Furthermore, the MnFe2O4/PB NPs were applied as a T1–T2 dual-modal MRI, PTT and MHT theranostic agent for in vivo MRI-guided photothermal and magnetic hyperthermia ablation of tumors by intratumoral injection in 4T1 tumor-bearing mice. The T1–T2 dual-modal MR imaging result shows a significantly contrast in the tumor site. The MPB-mediated PTT and MHT result shows high therapeutic efficiency as a result of high photothermal and magnetic hyperthermia conversion efficiency. The multifunctional NPs have a great potential application for future clinical tumorous diagnosis and treatment.
研究领域:
纳米技术
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生物医学工程
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材料科学
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癌症治疗
·
医学影像
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Yinxiu Zuo,Jingkun Xu,Fengxing Jiang,Xuemin Duan,Limin Lu,Huakun Xing,Taotao Yang,Youshan Zhang,Guo Ye,Yongfang Yu
A sensitive Pb(II) sensor was fabricated based on Co 3 O 4 /reduced graphene oxide/chitosan (Co 3 O 4 /rGO/chitosan) nanocomposite modified glassy carbon electrode (GCE). The Co 3 O 4 /rGO material was synthesized through in situ growth of Co 3 O 4 nanoparticles (NPs) on GO and subsequent hydrazine reduction process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that Co 3 O 4 NPs with a diameter of around 100 nm are attached on rGO sheets. The structures and compositions of Co 3 O 4 /rGO were further characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Many experimental parameters, such as pH value, deposition time and deposition potential were optimized. Under optimal conditions, the calibration plot for Pb(II), with data acquired at − 0.556 V ( vs . SCE) is linear in the concentration range from 1.0 to 200.0 nM. Combining the good conductivity and high surface area of rGO, strong Pb(II) adsorption ability of Co 3 O 4 NPs, and excellent Pb(II) complex-forming ability of chitosan, the nanocompsite provides a sensitive Pb(II) senor with a detection limit of 0.35 nM. Moreover, the positively charged chitosan can interact with the negatively charged rGO to increase the stability of Co 3 O 4 /rGO nanocomposite. The hybrid nanocomposite Pb(II) senor provides new opportunity for vegetable analysis.
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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食品安全
·
重金属毒理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）