BIOTECHNOLOGY LETTERS
·
2018
·Vol. 40
·期 5
·837-845
·
IF 1.846
Hui Chang-Ye,Guo Yan,Yang Xue-Qin,Zhang Wen,Huang Xian-Qing
Objectives To improve the Pb 2+ biosorption capacity of the potential E. coli biosorbent, a putative Pb 2+ binding domain (PbBD) derived from PbrR was efficiently displayed on to the E. coli cell surface. Results The PbBD was obtained by truncating the N-terminal DNA-binding domain and C-terminal redundant amino acid residues of the Pb 2+ -sensing transcriptional factor PbrR. Whole-cell sorbents were constructed with the full-length PbrR and PbBD of PbrR genetically engineered onto the surface of E. coli cells using Lpp-OmpA as the anchor. Followed by a 1.71-fold higher display of PbBD than PbrR, the presence of PbBD on the surface of E. coli cells enabled a 1.92-fold higher Pb 2+ biosorption than that found in PbrR-displayed cells. Specific Pb 2+ binding via PbBD was the same as Pb 2+ binding via the full-length PbrR, with no observable decline even in the presence of Zn 2+ and Cd 2+ . Conclusions Since surface-engineered E. coli cells with PbBD increased the Pb 2+ binding capacity and did not affect the adsorption selectivity, this suggests that surface display of the metal binding domain derived from MerR-like proteins may be used for the bioremediation of specific toxic heavy metals.
研究领域:
微生物学
·
环境科学
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Xiang Wang,Xin Yan,Bin-cheng Wang,Wei Xue,Chang-ren Zhou,Yi Zhang,Zong-hua Liu
Blood lead poisoning is a universal and severe health problem that greatly threatens human health in various industries. Elimination of blood lead relying on chelating agents and combination with hemoperfusion adsorbents has achieved considerable progress, but it is still suffering from the compromised selectivity of adsorbents as well as in absence of real time monitoring during treatment. Herein, we proposed a selective blood lead adsorbent integrated with real-time visualized/electrochemical bi-modal monitoring based on TMPyP-bound guanosine-borate (GB) supramolecular hydrogel as potential smart hemoperfusion device. The GB hydrogel possessed stability in physiological environment, self-healing ability resistant to fluid shear, blood compatibility, selective adsorption of lead ions superior to conventional adsorbents, anti-fouling performance to blood components and renewability. Benefiting from binding with TMPyP and the intrinsic conductivity, GB hydrogel was endowed with the ability to qualitatively diagnose the presence of blood lead via simple color change and quantitatively reflect the amount of adsorbed lead from blood accurately through electrochemical technique . This work puts forward an integrated treatment/monitoring hemoperfusion device with high selectivity, simple fabrication and low-cost, providing a paradigm for next generation design of intelligent, monitorable theranostic hemopurification system, which is also an extensible platform for the other research fields such as environmental monitoring and remediation.
研究领域:
医学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 20
·6781
·
IF 3.4
Guo-Cui Bao,Dong-Liang Shi,Jia-Ming Zhang,Fan Yang,Guang Yang,Kun Li,Bi-Jun Fang,Kwok-Ho Lam
The fabrication method plays a key role in the performance of lead magnesium niobate–lead titanate-based ceramics. (1 −w)[Pb(Mg1/3Nb2/3)0.67Ti0.33O3]-w[Pb1−1.5xSmx(Mg1/3Nb2/3)yTi1−yO3] piezoelectric ceramics were prepared by sintering the mixture of two different crystalline phases in which two pre-sintered precursor powders were mixed and co-fired at designated ratios (w= 0.3, 0.4, 0.5, 0.6). The X-ray diffraction results show that all the ceramics presented a pure perovskite structure. The grains were closely packed and the average size was ~5.18 μm based on observations from scanning electron microscopy images, making the ceramics have a high density that is 97.8% of the theoretical one. The piezoelectric, dielectric, and ferroelectric properties of the ceramics were investigated systematically. It was found that the properties of the ceramics were significantly enhanced when compared to the ceramics fabricated using the conventional one-step approach. An outstanding piezoelectric coefficientd33of 1103 pC/N and relative dielectric permittivityε33/ε0of 9154 was achieved for the ceramics withw= 0.5.Keywords:two different crystalline phases;PMNT-PSMNT;piezoelectric properties;dielectric properties
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Yongping Luo,Chuan Dong,Xiaogang Li,Yang Tian
A selective and sensitive photoelectrochemical sensor for lead ion (Pb 2+ ), which is based on the generated photocurrents of lead sulfide (PbS) nanoparticles under visible light irradiation , has been developed with theoretical and technical simplicity. The PbS nanoparticles are in-situ electrodeposited onto TiO 2 nanotube arrays with the gradual addition of Pb 2+ . The present sensor shows high selectivity against other metal ions , broad linear range from 10 −8 M to 10 −5 M, and low detection limit of 0.39 nM (∼0.08 ppb), which is much lower than the standard of Pb 2+ in drinking water formulated by World Health Organization (WHO). Thus, the strategy has been applied to successful detection of Pb 2+ in tap and lake water samples. The results for determination of Pb 2+ in lake water samples obtained by the present method and atomic adsorption spectroscopy (AAS) are consistent. However, the detection of Pb 2+ in tap water samples has just been realized by the present method, but AAS cannot, because of its low detection limit.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2019
·Vol. 77
·期 7
·3795-3811
·
IF 1.858
Wang Zhonghua,Zhou Wei,Zhu Liang
We investigated the adsorption of Cd 2+ and Pb 2+ using straw/bentonite-g-poly(acrylic acid- co -acrylamide) resin as an adsorbent in single and binary-component systems. The resin was characterized by various analytical techniques. Adsorption experiments were conducted by varying the pH, adsorbent dosage, initial concentration and temperature. Adsorption data for Cd 2+ and Pb 2+ fitted the Langmuir isotherm in the single-component system. Kinetic data for Cd 2+ and Pb 2+ followed the pseudo-second-order kinetic in a single-component system. A maximum adsorption for Cd 2+ occurred at pH 5, whereas for Pb 2+ , the maximum Cd 2+ adsorption occurred at pH 3. The maximum Cd 2+ and Pb 2+ adsorption capacities were 315.1 mg g −1 and 355.5 mg g −1 , respectively. In the binary-component system, the presence of Cd 2+ could improve the adsorption capacity of Pb 2+ and the presence of Pb 2+ could reduce the adsorption capacity of Cd 2+ when the Cd 2+ concentration was high. This study provides realistic and valid data on resin use to remove heavy metal ions from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Danyu Zhang,Shiwei Yang,Qingfang Ma,Jiannan Sun,Heyong Cheng,Yuanchao Wang,Jinhua Liu
This work establishes a hyphenated methodology coupling HPLC with ICP-MS for simultaneous speciation analysis of arsenic, mercury and lead for the first time. Four arsenicals (As(III), DMA, MMA and As(V)), four mercurials (Hg(II), MeHg, EtHg and PhHg) and three lead compounds (Pb(II), TML and TEL) were simultaneously analyzed within only 8 min with acceptable resolution (2.0–8.2 for As, 1.6–6.1 for Hg and 2.7–4.0 for Pb). The detection limits were 0.036–0.20 for As-species, 0.023–0.041 for Hg-species, and 0.0076–0.14 μg L −1 for Pb-species. The developed method was applied for the measurement of five lotus seed samples, indicating the presence of DMA (19.6–28.2 μg kg −1 ), TML (1.4–2.9 μg kg −1 ), MeHg (1.2–4.8 μg kg −1 ) and EtHg (0.8–2.2 μg kg −1 ). This method provides a promising tool for studying the toxic, metabolic and bioavailable behaviors of arsenic, mercury and lead.
研究领域:
分析化学
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环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF PEDIATRICS
·
2017
·Vol. 177
·期 2
·257-264
·
IF 1.921
Li Li,Guo Li,Chen Xingjie,Xiang Mingli,Yang Fang,Ren Jing-chao,Zhang Guang-hui
Secondhand smoke (SHS) has adverse effects on health, particularly for children. Our purpose was to analyze the correlation between SHS exposure and heavy metal concentrations in children. The investigation was conducted in Xinxiang County, Henan Province, China, from August 2015 to December 2015. In total, 821 students (433 boys and 388 girls) were recruited, and the contents of heavy metals in their hair—including chromium, manganese, nickel, arsenic, lead, and cadmium—were detected by ICP-MS. The children’s parents were informed, and a questionnaire was conducted, which included questions about smoking habits and demographic characteristics. Our results indicate that all parent smokers are fathers, 48.9% of fathers who are smokers, but 25.2% of fathers smoke in front of their children. The levels of chromium (median girls vs boys, μg/g) (2.36 vs 2.06, p < 0.001), nickel (1.28 vs 0.97, p < 0.001), arsenic (0.55 vs 0.49, p < 0.001), and lead (2.73 vs 2.16, p < 0.001) in girls were significantly higher than in boys. The levels of cadmium (median, SHS group vs control: 0.43 vs 0.29 (μg/g), p < 0.001) and lead (median, SHS group vs control: 2.71 vs 2.27 (μg/g), p = 0.007) in the SHS group were significantly higher than in the control. Multi-linear regression analysis indicated that SHS exposure in children is very likely to be correlated with increasing levels of lead (β (95% CI): 0.53 (0.99–5.14), p = 0.023) and cadmium (β (95% CI): 0.43 (0.14–0.73), p = 0.003) in their hair. In conclusion, children exposed to SHS have increased lead and cadmium accumulations in the body.
Conclusion : In our study, 821 students (433 boys and 388 girls) were recruited, and the contents of heavy metals in their hair—including chromium, manganese, nickel, arsenic, lead, and cadmium—were detected by ICP-MS. And the secondhand smoking (SHS) exposure was inquired by face-to-face investigation of their parents. We illustrated that children exposed to SHS have increased lead and cadmium accumulations in the body.
What is Known:
• Secondhand smoke (SHS) has adverse effects on health, particularly for children.
• There might be correlation between SHS exposure and heavy metal concentrations in children .
What is New:
• The levels of chromium, nickel, arsenic, and lead in girls were significantly higher than in boys . • SHS exposure in children was correlated with increasing levels of lead and cadmium in their hair because of exposure to SHS .
研究领域:
公共卫生
·
环境医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2023
·Vol. 15
·期 20
·3667
·
IF 3.4
Junqing Xu,Meitian Pan,Cong Zou,Xueqiong Huang,Takeshi Hagio,Ryoichi Ichino,Long Kong,Liang Li
Heavy metal pollution poses an environmental risk, and its efficient removal and facile separation from water remains a challenge. Magnetic iron oxide, an eco-friendly, relatively stable, and easy-separation material, has been regarded as one of the most applicable adsorbents for water treatment. However, the limited adsorption capacity has restricted its applications. Herein, sulfur-doped magnetic Fe3O4(Sx–Fe3O4) adsorbent was fabricated using a calcination method for the efficient removal of Pb(II) from water. In contrast to undoped Fe3O4, the introduction of doped sulfur greatly enhanced the adsorption performance of S–Fe3O4over four times, with a maximum capacity of 333.33 mg g−1, which was synthesized at 300 °C with a raw molar ratio of S–Fe of 5. Based on the structure and morphology analysis, it was demonstrated that sulfur was successfully doped into the Fe3O4structures, which resulted in Fe3O4with active sulfur sites accordingly contributing to the adsorption enhancement through the combination of strong soft–soft interactions between soft base sulfur and soft acid Pb(II) along with surface adsorption. Sx–Fe3O4could maintain the adsorption performance in the presence of competing ions. Furthermore, although the sulfur doping process exhibited slight side effects on the magnetic property, magnetic Sx–Fe3O4maintained the high separation potential. This study presented a promising strategy to enhance the adsorption performance of Fe3O4through sulfur doping for Pb(II) removal from water.Keywords:adsorption;Pb;sulfur-doped Fe3O4;water treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 37
·12581-12589
·
IF 7.393
Yixuan Liu,Lulu Zhang,Xuemi Long,PanPan Jiang,Chong Geng,Shu Xu
Perovskite nanocrystals (PNCs) are promising luminescent materials but suffer severe stability issues due to their ionic surface nature. SiO2 encapsulation is widely adopted for stabilizing PNCs in LED lighting and display applications. However, PNCs commonly lose ligands during the SiO2 encapsulation process, leading to fluorescence quenching and agglomeration. Here, CsPbBr3 PNCs with lead-carboxylate capping motif, which shows extraordinary ethanol and moisture resistance, were developed to facilitate fast and controlled growth of PNC–SiO2 nanocrystals using ethanol to accelerate the hydrolysis of tetramethoxysilane. Surface analysis revealed the preservation of the original carboxylate ligands after the reaction. Carboxylate and SiO2 form uniform dual-encapsulation that provides PNCs with superior air and water resistance, excellent photoluminescence maintenance, and high miscibility in silicone resin. Finally, saturated green LED and white-light LED with a wide color gamut were fabricated through on-chip packaging of the PNC–SiO2 on the blue LED chip. LEDs retained >85% of their light intensity after continuous illumination for 1000 h, demonstrating the high potential of the encapsulation method and the materials in light-emitting applications.
研究领域:
材料科学
·
光学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Engineering and Technology
·
2024
·
IF 2.6
Taiqi Yin,Yongcheng Zhang,Lei Zhang,Tao Bo,Xiaoli Tan,Weiqun Shi
Traditional physical methods for measuring solubility were often affected by viscosity, density, and surface tension. In this study, we selected appropriate electrolytes to determine the solubility of impurities in the lead-bismuth circuit at reactor operating temperatures using electrochemical methods. Taking the measurement of the solubility of impurity Ce in liquid Bi as an example, we demonstrated that electrochemical methods can accurately determine its solubility in the LiCl-KCl molten salt. Furthermore, the successful measurement of other impurities such as La, Ce, U, and Mn in lead-bismuth eutectic (LBE) using the designed system has confirmed the universality of this method.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Wei Sun,Qi Sun,Qiang Zhao,Luminita Marin,Xinjian Cheng
In this work, SiO2 microspheres were first prepared by a conventional Stöber method and then etched by NaOH solution to obtain porous ones. By tuning the degree of etching, specific surface area of SiO2 microspheres could be controlled. Then, small fluorescent molecules are synthesized and incorporated onto the surface and/or pores of the SiO2 via layer-by-layer reaction to obtain fluorescent microspheres, namely, SiO2–NH2–BODIPY (SiNBB), SiO2–NH2–BODIPY–indole–benzothiazole (SiNBIT), and SiO2–NH2–BODIPY–indole–benzoxazole (SiNBIO). The as-prepared microspheres SiNBB exhibit highly sensitive and selective recognition ability for Hg2+ and Pb2+. When SiNBB encounters Hg2+ and Pb2+, the fluorescence intensity of SiNBB is increased up to fivefold. SiNBIT and SiNBIO are solely sensitive to Hg2+, and both have a single high sensitivity to recognize Hg2+. The adsorption efficiency of Hg2+ by the three fluorescent microspheres SiNBB, SiNBIT, and SiNBIO reached 2.91, 0.99, and 0.98 g/g of microspheres, respectively. Experimental results of A549 cells and zebrafish indicate that the fluorescent microspheres are permeable to cell membranes and organisms. The distribution of Hg2+ in the brain of zebrafish was obtained by the fluorescence confocal imaging technique, and Hg2+ was successfully detected in A549 cells and zebrafish.
研究领域:
分析化学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 39
·2303674
·
IF 29.4
Wenxiao Zhang,Haobo Yuan,Xiaodong Li,Xuemin Guo,Chunyan Lu,Acan Liu,Hui Yang,Lin Xu,Xueliang Shi,Zhiwei Fang,Haibo Yang,Ya Cheng,Junfeng Fang
Tin-lead (Sn-Pb) perovskite solar cells (PSCs) with near-ideal bandgap still lag behind the pure lead PSCs. Disordered heterojunctions caused by inhomogeneous Sn/Pb ratio in the binary perovskite film induce large recombination loss. Here, an Sn-Pb perovskite film is reported with homogeneous component and energy distribution by introducing hydrazine sulfate (HS) in Sn perovskite precursor. HS can form hydrogen bond network and coordinate with FASnI 3 thus no longer bond with Pb 2+ , which reduces the crystallization rate of tin perovskite to the level of lead analog. The strong bonding between SO 4 2− and Sn 2+ can also suppress its oxidation. As a result, the Sn-Pb PSCs with HS exhibit a significantly improved V OC of 0.91 V along with a high efficiency of 23.17%. Meanwhile, the hydrogen bond interaction network, strong bonding between Sn 2+ and sulfate ion also improve the thermal, storage, and air stability of resulting devices.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）