MONATSHEFTE FUR CHEMIE
·
2019
·Vol. 150
·期 11
·1903-1910
·
IF 1.501
Li Zhongqiu,Yang Kunhao,Lv Yueguang,Wang Qingnan,Li Chang,Wu Li,He Yujian
Abstract A novel method, based on modified silver nanoparticles, for high-throughput visual detection of heavy metal ions in polyvinyl chloride (PVC) products was developed including a key pretreatment process in which tetrahydrofuran was used to dissolve PVC powder samples quickly. Heavy metal ions were successfully transferred from THF to the aqueous phase by the liquid–liquid extraction method during the pretreatment procedures. Then, enriched Cu 2+ , Mn 2+ , and Cr 3+ were detected by three kinds of silver nanoparticles (4-MBA-AgNPs, 4-MBA-MA-AgNPs, and 4-NBT/4-MBA-AgNPs) using naked eyes and microplate reader, respectively. The visual detection limits of Cu 2+ , Mn 2+ , and Cr 3+ were 1.0 × 10 −6 M, 1.0 × 10 −7 M, and 1.0 × 10 −6 M, while the detection limits of Cu 2+ , Mn 2+ , and Cr 3+ were 2.5 × 10 −8 M, 5.0 × 10 −8 M, and 5.0 × 10 −8 M using microplate reader, respectively. Apparently, the proposed method could provide a potent means in the practical detection of heavy metal ions in PVC products with advantages of low-cost, rapid, high-throughput, and on-site detection. Graphic abstract
研究领域:
分析化学
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2024
·
IF 10.7
Yingchun Niu,Yinping Liu,Tianhang Zhou,Chao Guo,Guangfu Wu,Wenjie Lv,Ali Heydari,Bo Peng,Chunming Xu,Quan Xu
Iron-chromium flow batteries (ICRFBs) have emerged as an ideal large-scale energy storage device with broad application prospects in recent years. Enhancement of the Cr 3+ /Cr 2+ redox reaction activity and inhibition of the hydrogen evolution side reaction (HER) are essential for the development of ICRFBs and require a novel catalyst design. However, elucidating the underlying mechanisms for modulating catalyst behaviors remains an unresolved challenge. Here, we show a novel precisely controlled preparation of a novel thermal-treated carbon cloth electrode with a uniform deposit of low-cost indium catalyst particles. The density functional theory analysis reveals the In catalyst has a significant adsorption effect on the reactants and improves the redox reaction activity of Cr 3+ /Cr 2+ . Moreover, H + is more easily absorbed on the surface of the catalyst with a high migration energy barrier, thereby inhibiting the occurrence of HER. The assembled ICRFBs have an average energy efficiency of 83.91% at 140 mA/cm 2 , and this method minimizes the electrodeposition process and cleans the last obstacle for industry long cycle operation requirements. The ICRFBs exhibit exceptional long-term stability with an energy efficiency decay rate of 0.011% per cycle at 1000 cycles, the lowest ICRFBs reported so far. Therefore, this study provides a promising strategy for developing ICRFBs with low costs and long cycle life.
研究领域:
能源存储
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催化
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Wenchao Niu,Xiaoshan Qiu,Pingxiao Wu,Wenqi Guan,Yihao Zhan,Luwei Jin,Nengwu Zhu
Aluminol groups are effective for removing toxic metal ions . However, their use is significantly limited because they are usually on the inner surface of halloysite tubes. Herein, we realign and expose the abundant aluminol groups using a hydrothermal process. We found that dickite was gradually formed with increased sodium metasilicate proportion. Also, a uniform mushroom-like structure was formed, extending from the orifice to the middle of the hollow tubes and eventually forming a sphere. Further, part of the halloysite tube gradually broke, expanding into lamellar, eventually forming a small spheroid. The Al-O-Si groups were fractured by sodium metasilicate and aluminol groups on the inner surface of halloysite tubes, forming many aluminol groups. Moreover, the average pore size of the halloysite increased, indicating that numerous halloysite mesopores converted to dickite macropores . Thus, we inferred that the tubes gradually unfolded when the metasilicate first binds with the aluminol groups on the inner of the halloysite tubes. The modification enhanced the material's adsorption capacity for Pb 2+ , Cd 2+ , and Cr 3+ nearly 20, 12, and 10 times, respectively, stronger than the original halloysite mineral. Consequently, exposing and realigning aluminol groups of halloysite significantly improved toxic metal ions' removal.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 41
·2306517
·
IF 29.4
Wenge Xiao,Endale T. Basore,Guojun Zheng,Xiaofeng Liu,Beibei Xu,Jianrong Qiu
The brightness of doped luminescent materials is usually limited by the ubiquitous concentration quenching phenomenon resulting in an intractable tradeoff between internal quantum efficiency and excitation efficiency. Here, an intrinsic suppression of concentration quenching in sensitized luminescent systems, by exploiting the competitive relationship between light emitters and quenchers in trapping excitation energies from sensitizers, is reported. Although Cr 3+ sensitizers and trivalent lanthanide (Ln 3+ , Ln = Yb, Nd, and Er) emitters themselves are highly susceptible to concentration quenching, the unprecedentedly high-brightness luminescence of Cr 3+ –Ln 3+ systems is demonstrated in the short-wave infrared (SWIR) range employing high concentrations of Cr 3+ , whereby a record photoelectric efficiency of 23% is achieved for SWIR phosphor-converted light-emitting diodes, which is about twice as high as those previously reported. The results underscore the beneficial role of emitters in terminating excitation energies, opening up a new dimension for developing efficient sensitized luminescent materials.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Wenxi Xia,Jiangli Fan,Lizhu Zhang,Jingyun Wang,Jianjun Du,Xiaojun Peng
The dichromate as an industrial oxidant has a very extensive application. However, as one of the heavy metal elements, chromium has become a great threat to the organism and environment due to its carcinogenicity and mutageicity. So far, there is only a small number of detection and imaging methods for dichromate. In this work, a new fluorescent probe RhoCr for detecting dichromate based on in situ Cr 3+ -controlled opening of spirolactam-ring in a rhodamine dye after Cr 2 O 7 2− reduced to Cr 3+ by NaHSO 3 in solution and self-reduction in organism is reported, which displays a strong enhancement of fluorescence emission (λ em 582 nm), fast response (completed within 2 min) and excellent sensitivity (DL 1.18 nM). RhoCr successfully obtained fluorescence images of the intracellular Cr 2 O 7 2− . In addition, the effect have been exhibited in tap water and pool water, which will be crucial to the detection of dichromate in the environment.
研究领域:
分析化学
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环境科学
·
细胞生物学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 20
·9472-9483
·
IF 2.302
Wang Qiang,Feng Jin,Ma Lirong,Wei Wei,Xie Jimin,Xia Changkun,Zhu Jianjun,Jiang Deli
Monolithic silica aerogels were prepared by sol–gel process via ambient drying process. TEOS and APTES were used as coprecursors and wet gels were crosslinked by three kinds of diisocyanate. The strengthened silica aerogels possess densities which range from 0.298 to 0.463 g/cm 3 , and the specific surface areas range from 81.17 to 135.48 m 2 /g. In this paper, silica aerogels crosslinked with different diisocyanate were used as adsorbents for the removal of heavy metals. At the same time, some factors such as the initial pH and concentration of heavy metals were investigated by a batch of experiments. The equilibrium sorption data have been fitted by different isotherm model, and the data fitting by Freundlich isotherm model indicates that the process of adsorption is favorable. Under the condition of the optimum adsorption pH, the maximum theoretical adsorption capacity computed from Langmuir model is 118.73 mg/g for Pb 2+ , 57.03 mg/g for Cr 3+ , and 60.86 mg/g for Cd 2+ , respectively with the silica aerogels crosslinked with 1,6-hexamethylene diisocyanate (HDI).
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xianzhe Zhang,Pengpeng Dai,Dawei Wen
Portable near-infrared (NIR) lighting source stimulates great efforts to exploit NIR phosphor-converted LEDs (pc-LEDs) that push the rapid development of broadband NIR-emitting phosphors. Although Cr 3+ -activated NIR phosphors designed by multisites occupation strategy show significant potential in emission bandwidth, poor spectral stability caused by different thermal quenching behaviors is a brake on practical application due to different local structure around Cr centers. One-site-based NIR phosphors seem to be an effective method to solve aforementioned problem. Herein, we report a type of new ultra-broadband one-site-based NIR-emitting phosphors NaSc 1-x P 2 O 7 :xCr 3+ (NSP:xCr 3+ ) with emission at 910 nm and full width at half maximum (FWHM) of up to ∼200 nm. Their FWHM value exceeds all one-site-based Cr 3+ -activated phosphors and some multiple-sites ones. Structural analysis and low-temperature spectra demonstrate that such impressive broadband NIR emission originates from Cr 3+ occupying at single octahedral Sc site. At 425 K, integrated emission intensity of NSP:0.04Cr 3+ phosphor maintains 53.8% of room temperature. A NIR pc-LED prototype is fabricated by using NSP:0.04Cr 3+ phosphor with a blue LED chip, and its multipurpose applications in non-destructive detection, night vision and analysis of foodstuff are demonstrated. These findings indicate that broadband NSP:0.04Cr 3+ NIR phosphor enabled by one-site occupation strategy has potential prospect for multipurpose NIR pc-LEDs applications.
研究领域:
材料科学
·
光电技术
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光子学
·
固体物理
·
照明技术
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xiaotong Wu,Lei Tan,Yuling Li,Wanqiong Liu,Zhihua Peng,Yanshan Dong,Zeyu Huang,Lin Zhang,Yong Liang
In this work, we demonstrated a sensor array with multiple fluorescence channels using dendritic mesoporous silica nanoparticles embedded with three quantum dots for the determination of four heavy metal ions (Hg 2+ , Cu 2+ , Cr 3+ , and Ag + ). Carboxyl-modified CdTe QDs with three different fluorescence emission wavelengths were loaded onto a dendritic mesoporous supporter by an amidation reaction. The fluorescence sensor array exhibited excellent analytical performance for discrimination and semi-quantification of heavy metal ions from a single test, which simplified detection procedures. The four heavy metal ions exhibited different degrees of quenching of the fluorescence emission intensities of the three quantum dots and resulted in a variant data matrix for linear discriminant analysis . Under optimized conditions, the fluorescence sensor array discriminated the four heavy metal ions in a concentration range of 0.05–5 μmol/L, and semi-quantified Hg 2+ , Cu 2+ , Cr 3+ , and Ag + with a limit of detection of 2.51 nmol/L, 5.15 nmol/L, 3.81 nmol/L, and 5.74 nmol/L, respectively. The fluorescence sensor array integrated the sensing units into a single nanoparticle instead of the complex multiple detection steps used in traditional sensor arrays, providing an alternative strategy for constructing a single-well sensing platform. Furthermore, the fluorescence sensor array showed great practical potential for distinguishing heavy metal ions in raw water and crayfish samples.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 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）