MOLECULES
·
2019
·Vol. 24
·期 15
·2704
·
IF 3.06
Chao Liu,Youming Li,Yi Hou
Carboxymethyl lignin nanospheres (CLNPs) were synthesized by a two-step method using microwave irradiation and antisolvent. The morphology and structure of CLNPs were characterized by31P-NMR, FTIR, and SEM, and the results showed that they had an average diameter of 73.9 nm, a surface area of 8.63 m2or 3.2 times larger than the original lignin, and abundant carboxyl functional groups of 1.8 mmol/g. The influence of dosage, pH, contact time, and concentration on the adsorption of metal ions onto CLNPs were analyzed, and the maximum adsorption capacity of CLNPs for Pb(II) was found to be 333.26 mg/g, which is significantly higher than other lignin-based adsorbents and conventional adsorbents. Adsorption kinetics and isotherms indicated that the adsorption of lead ions in water onto CLNPs followed the pseudo-second-order model based on monolayer chemisorption mechanism. The main chemical interaction between CLNPs and lead ions was chelation. CLNPs also showed an excellent recycling performance, with only 27.0% adsorption capacity loss after 10 consecutive adsorption–desorption cycles.Keywords:lignin;carboxymethyl;nanosphere;adsorption;lead
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 15
·11475-11484
·
IF 3.84
Yuanqing Huang,Chunping Yang,Zhichao Sun,Guangming Zeng,Huijun He
Cadmium (Cd2+) and lead (Pb2+) posed severe health risks worldwide. To remove these contaminants from aqueous solution, a nitrilotriacetic acid anhydride (NTAA) modified ligno-cellulosic material (NTAA-LCM) was prepared and characterized. Batch sorption experiments were performed to evaluate the influences of various factors such as contact time, pH, ionic strength, temperature and initial metal concentration on the sorption of metals. Results from elemental analysis and FTIR suggested that ester bonds and amine groups were successfully introduced into NTAA-LCM. Fast adsorption rates were observed, and the maximum sorption capacities of NTAA-LCM for Cd2+ and Pb2+ reached 143.4 and 303.5 mg g−1 at 298 K, respectively. Both the pseudo-second-order model and the Langmuir model described the adsorption extremely well. Thermodynamic analysis showed that the sorption was endothermic but spontaneous. The sorption was a chemical process involving surface chelation and ion exchange; this was reflected in the metal/NTA ratio. Additionally, NTAA-LCM retained high metal sorption capacity after seven cycles of regeneration by HNO3.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Hao Luo,Shengxiao Zhang,Xiaoyan Li,Xia Liu,Qiang Xu,Junshen Liu,Zhenhua Wang
Tannic acid (TA) film covered magnetic microspheres (Fe 3 O 4 @TA–Fe 3+ ) was synthesized and applied for removal of Pb 2+ and Hg 2+ from aqueous solution. The resulted Fe 3 O 4 @TA–Fe 3+ was characterized with thermo-gravimetric analysis, vibrating sample magnetometer, transmission electron microscope, and Fourier transform infrared spectra. The adsorption of pollutants was pH dependent because the complexation of TA with Fe 3+ was disassembled at low pH. The composites showed high maximum adsorption capacity for Pb 2+ up to 1115.3 mg/g and Hg 2+ to 279.4 mg/g. Furthermore, the Fe 3 O 4 @TA–Fe 3+ composites could be easily separated from the solution by a magnet after adsorption because of the excellent superparamagnetic property. Thermodynamics study indicated that the adsorption of Pb 2+ and Hg 2+ on Fe 3 O 4 @TA–Fe 3+ sorbents was spontaneous, chaotic degree decreasing and endothermic process. The present results warrant the promising application of magnetic Fe 3 O 4 @TA–Fe 3+ composites for removal of Pb 2+ and Hg 2+ from contaminated water, and this study is the first application of TA film in environmental remediation.
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
高影响因子
Materials
·
2024
·Vol. 17
·期 9
·2170
·
IF 3.1
Kuiju Li,Kezhu Han,Gele Teri,Yuxiao Tian,Menglei Cui,Yunpeng Qi,Yuhu Li
This study analyzes the pigments and binders used in the painted wooden structure of DaZhong Gate in the Confucius Temple in Qufu, Shandong Province, China. Five samples were collected from the building and analyzed using techniques such as polarized light microscopy (PLM), energy-dispersive X-ray spectroscopy (EDX), micro-Raman spectroscopy (m-RS), and Fourier-transform infrared spectroscopy (FT-IR). The findings reveal that the red, yellow, green, and blue pigments are identified as lead red, lead chromate yellow, emerald green, and ultramarine, respectively. The white pigment is determined to be a combination of chalk and lead white or anglesite. Considering the production period of the yellow and green pigments, it is inferred that architectural paintings underwent restoration or repainting during the late Qing Dynasty. The analysis of the binder in the pigment using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) reveals that the binder employed is a protein-based glue. Additionally, the detected presence of Heat-bodied tung oil suggests a potential connection to traditional Chinese painting techniques on wooden surfaces. This discovery not only contributes to the historical research of the Confucius Temple but also provides crucial data for the conservation and restoration efforts of this culturally significant heritage site.
研究领域:
文物保护
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材料科学
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产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
Hong-fu LIN,Wei WENG,Shui-ping ZHONG,Guan-zhou QIU
High-efficiency recovery of Zn and Pb from silicon-rich zinc leaching residues is realized in a rotary kiln. Characterizations by means of XRD, SEM, EDS and ICP reveal that the leaching residue contains 12.4 wt.% SiO 2 , 16.1 wt.% Zn, and 7.4 wt.% Pb. Thermodynamic analysis shows that metallic vapor of Zn and Pb can be easily generated from the zinc leaching residue at 1150−1250 °C inside the rotary kiln. Viscosities and melting points of 13 slag compositions were analyzed and three slag compositions (47wt.%SiO 2 −23wt.%CaO−30wt.%FeO, 40wt.%SiO 2 − 28wt.%CaO−32wt.%FeO, and 40wt.%SiO 2 −30wt.%CaO−30wt.%FeO) possessed the desirable physical properties, with the melting point and viscosity in the range of 1150−1280 °C and 0.2−0.5 Pa·s, respectively. The industrial tests show that adopting the optimized slag composition can contribute to very high recovery rates of Zn and Pb (97.3% for Zn and 94.5% for Pb), corresponding to slags with very low average contents of Zn and Pb (0.51 wt.% Zn and 0.45 wt.% Pb). The National-Standard leaching tests of the water-quenched slags result in 1.82 mg/L Zn, ~0.01 mg/L Cu, 0.0004 mg/L As, ~0.01 mg/L Cd, 0.08 mg/L Pb, and ~0.02 mg/L Hg in the leachate, verifying the detoxification of the zinc leaching residue at the same time.
研究领域:
冶金工程
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环境科学
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DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 9
·2655
·
IF 3.5
Zhengying Guo,Peng Xu,Shiqing Zhou,Ruoxi Wu
Excessive levels of heavy metal pollutants in the environment pose significant threats to human health and ecosystem stability. Consequently, the accurate and rapid detection of heavy metal ions is critically important. A AgNPs@CeO2/Nafion composite was prepared by dispersing nano-ceria (CeO2) in a Nafion solution and incorporating silver nanoparticles (AgNPs). The morphology, microstructure, and electrochemical properties of the modified electrode materials were systematically characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and cyclic voltammetry (CV). By leveraging the oxygen vacancies and high electron transfer efficiency of CeO2, the strong adsorption capacity of Nafion, and the superior conductivity of AgNPs, an AgNPs@CeO2/Nafion/GCE electrochemical sensor was developed. Under optimized conditions, trace Pb2+in water was detected using square wave anodic stripping voltammetry (SWASV). The sensor demonstrated a linear response for Pb2+within the concentration range of 1–100 μg·L−1, with a detection limit of 0.17 μg·L−1(S/N = 3). When applied to real water samples, the method achieved recovery rates between 93.7% and 110.3%, validating its reliability and practical applicability.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yanju Chen,Hui Wu,Siwenjie Qian,Xiaoping Yu,Huan Chen,Jian Wu
Heavy metal lead accumulation in the environment pollutes the ecology systems and further threatens the human health. It is necessary to develop a sensitive method to detect it. Here, we propose a highly sensitive lead detection method by combining DNAzyme and CRISPR system. Once the lead ion is recognized, the substrate chain of DNAzyme is cleaved to produce single strand DNA . The produced single strand DNA can be detected by Cas protein/guide RNA complex and further trigger the collateral cleavage effect of CRISPR system, which can indiscriminately cut short single strand DNA reporters. By this way, the detection signals can be greatly amplified. This method can detect lead ions as low as 0.48 nM. The sensitivity is higher than the DNAzyme method. Furthermore, the portable 3D printing device is designed to observe the fluorescent signals so the end-point detection results can be visualized by the naked eyes. The entire detection process can avoid using bulky and expensive instruments, which can promote on-site lead ion detection.
研究领域:
生物化学
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分子生物学
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环境科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Yage Li,Sabry M. Shaheen,Muhammad Azeem,Lan Zhang,Chuchu Feng,Jin Peng,Weidong Qi,Junxi Liu,Yuan Luo,Yaru Peng,Esmat F. Ali,Ken Smith,Jörg Rinklebe,Zengqiang Zhang,Ronghua Li
Removal of toxic chemicals from the environment using novel adsorbents is of great concern. In this study, a novel composite of molybdenum trioxide (MoO 3 )-engineered biochar (MoO 3 -BC) was derived from corn straw and synthesized for the removal of Pb(II) from water. The pyrolysis temperature of 600 °C was suitable for the thermal self-assembly of MoO 3 -BC. Although MoO 3 -BC had lower S BET (59.3 m 2 /g) than the pristine BC (157.8 m 2 /g), it had a stronger adsorption affinity to Pb(II). The Pb(II) removal capacity of MoO 3 -BC was 229.87 mg/g at pH 4.0, and the adsorptive removal of Pb(II) was fit using a pseudo-second-order model and the Langmuir model. High temperature favored the removal of Pb(II) by MoO 3 -BC; However, the removal of Pb(II) was inhibited with increasing the ion strength. The MoO 3 -BC revealed an acceptable stability and reusability, since the removal efficiency of Pb(II) remained above 80.7%, even after 8 cycles. The MoO 3 -BC effectively reduced ≥99.9% of Pb(II) in the polluted irrigation water. The Pb(II) removal mechanisms involved surface electrostatic attraction, ion exchange and surface complexation. These findings conclude that the MoO 3 -BC is a novel composite that can be used for the removal of Pb from contaminated water . More studies are needed to investigate the potentiality of MoO 3 -biochar composite for the removal of other metals from water in a mono and competitive sorption system.
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
TALANTA
·
2023
·
IF 6.1
Jinpeng Liu,Yanhui Bi,Wenjun Tai,Yong Wei,Qiang Zhang,Anna Liu,Qiongzheng Hu,Li Yu
Due to the serious risks of lead pollution to human health, it plays a great role in constructing a simple, inexpensive, portable, and user-friendly strategy for Pb 2+ detection in environmental samples. Herein, a paper-based distance sensor is developed to detect Pb 2+ assisted with the target-responsive DNA hydrogel. Pb 2+ can activate DNAzyme to cleave its substrate strand, which results in the hydrolysis of the DNA hydrogel. The released water molecules trapped in the hydrogel can flow along the patterned pH paper due to the capillary force. The water flow distance (WFD) is significantly influenced by the amount of water released from the collapsed DNA hydrogel triggered by the addition of various Pb 2+ concentrations. In this way, Pb 2+ can be quantitatively detected without using specialized instruments and labeled molecules, and the limit of detection (LOD) of Pb 2+ is 3.0 nM. Additionally, the Pb 2+ sensor works well in lake water and tap water. Overall, this simple, inexpensive, portable, and user-friendly method is very promising for quantitative and in-field detection of Pb 2+ with excellent sensitivity and selectivity .
研究领域:
生物化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Nutrition
·
2022
·
IF 6.59
Zhenhui Chen,Ziyu Tang,Jingjing Kong,Lixuan Chen,Jiaxin Liu,Yunting Li,Wanwen Huang,Wendan Li,Junlin Wu,Wei Zhao,Xiaojing Meng,Hongying Fan
Pb poisoning affects infant growth and development. However, dimercaptosuccinic acid (DMSA) as the current therapy for Pb poisoning exerts relatively significant toxic side effects in infants. Therefore, identifying a non-toxic treatment in this regard is particularly important. In this study, we aimed to investigate the therapeutic effect of an infant feces-derived probiotic strain, Lactobacillus casei SYF-08 (SYF-08), on Pb poisoning in young mice. The Pb levels in the organisms were detected via inductively coupled plasma mass spectrometry, while the therapeutic effect of SYF-08 on Pb-induced neural system damage was explored via the Morris water maze test, hematoxylin-eosin staining, and immunohistochemistry. Additionally, the molecular mechanisms underlying the protective effects of SYF-08 against Pb-induced intestinal damage were also explored via histological staining, 16S rRNA sequencing, untargeted metabolomics, qRT-PCR, and western blotting. In vivo experiments revealed that SYF-08 reduced blood and bone Pb levels and increased urinary Pb excretion. Additionally, SYF-08 alleviated Pb-induced pathological damage to the brain and ultimately improved the learning and cognitive abilities of the young mice. This treatment also restored intestinal microflora dysbiosis, regulated bile acid metabolism, and inhibited the FXR-NLRP3 signaling pathway. It also resulted in fewer adverse events than the DMSA treatment. In conclusion, our results provided valuable insights into the therapeutic role of SYF-08 in Pb poisoning and also suggested that its administration can significantly alleviate the Pb-induced damage.
研究领域:
微生物学
·
毒理学
·
神经科学
·
代谢组学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ming Li,Xiaoqin Yuan,Haoran Ruan,Xiandong Wang,Yongping Liu,Zhenhuan Lu,Jiefeng Hai
A new method for synthesizing freestanding PbS-CH 3 NH 3 PbI 3 (MAPI) core-shell nanoparticles (NPs) with enhanced light absorption and photoelectric properties was reported. The transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) analysis confirmed the core-shell structure of the obtained sample. The Vis-NIR spectra proved the core-shell sample absorbed light both in visible and near infrared region . For comparison, oleic acid/oleylamine molecule capping PbS NPs, MAPI molecule capping PbS NPs, and PbS-MAPI core-shell NPs were used to fabricate Schottky solar cells. PbS-MAPI core-shell NPs based solar cells delivered a photocurrent response from both the PbS and MAPI, and achieved the highest overall PCE.
研究领域:
材料科学
·
纳米科技
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光电子学
·
能源材料
·
半导体物理
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
·
2015
·Vol. 70
·期 9
·617-623
·
IF 0.744
Gao-Feng Wang,Xiao Zhang,Shu-Wen Sun,Chen-Zhong Yao,Zhao-Rong Liu,Yu-Chun Wang,Yuan-Zhong Liu
A new copper(II)/lead(II) complex [(terpy) 3 CuPb 5 Br 12 ] ( 1 ) (terpy = 2,2′:6′,2″-terpyridine) has been synthesized and characterized by IR, elemental analysis, and single-crystal X-ray diffraction analysis. The copper(II) and lead(II) ions in the title complex are in distorted six- (Cu(II), Pb(II)) and eight-fold (Pb(II)) coordination environments, in which the donor atoms are provided by bromide anions and nitrogen atoms of the 2,2′:6′,2″-terpyridine ligands. Complex 1 contains [(terpy) 4 Pb 9 Br 20 ] 2– building blocks. These bromoplumbate(II) clusters are connected by (terpy) 2 Cu 2 Br 4 units along the crystallographic b axis and by PbBr 6 units along the a axis, thereby forming an extended sheet structure.
研究领域:
无机化学
·
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）