WATER RESEARCH
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2024
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IF 11.4
Yang Deng,Shansheng Mo,Gregory V. Korshin,Mingquan Yan
Differential absorption spectroscopy (DAS) quantifies changes in the UV–Visible absorbance of dissolved organic matter (DOM) caused by reactions of its chromophores. As a result of its precision and sensitvity, DAS serves as a powerful tool for characterizing the formation of disinfection by-products (DBPs) in generated in DOM chlorination reactions. However, the nonlinear relationship between the intensity of DAS and DBP concentrations as well as the need to develop site-specific fitting parameters limit its practical applications. This study investigated the physico-chemical nature of DAS of chlorinated DOM through experimental measurements and theoretical calculations. Results of this study provide molecular-level evidence that electrophilic substitution reactions involving DOM reactive sites result in the emergence of DAS feaures ascribed to the "fast" chromophores. The ring opening in the cyclic enones-like structures which can be present either in the original DOM or are generated as intermediates in its chlorination, leads to the emergence of DAS features associated with the "slow" chromophores and high yields of DBPs. The kinetic study of chlorination of real waters reveals a strong linear relationship (R 2 > 0.91) between ln([DBP]) and the long-wavelength (λ > 325 nm) parameter of the DAS, notably (ln(-DA 350 )). This relationship varies among different water sources due to the differences in the heterogeneity of Band A 3 whose maximum is near 350 nm. Band A 3 is one of the Gaussian bands that comprise the overall UV–Visible spectrum of DOM. A new function ( f ( − D A 350 ) ) is proposed in this study to quantify DBP formation. This function, which is determined by the Band A 3 's area, allows establishing a universal linear relationship between f ( − D A 350 ) and ln([THMs]), as well as f ( − D A 350 ) and ln([HAAs]), across various water sources. The findings of this study will stimulate further development of spectroscopy-based DBP monitoring technology for monitoring and optimization of water disinfection processes.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Gongle Shen,Linling Zhong,Yuanhang Bi,Yifan Liu,Jiangqi Zhao,Xin Wen,Yifei Zhu,Lei Feng,Li Geng,Fan Yu,Changjun Hou,Xianfeng Wang
Considering the vital role of sulfide ions (S 2- ) in food safety, environmental pollution and public health, accurate and efficient detection of S 2- is of great importance. In this study, Er-MOFs with the structure of four-pointed star was successfully designed and synthesized using Er(III) as the metal center and TCPP as the ligand. It is found that host-guest effects occur between Er-MOFs and S 2- , blocking the ligand-to-metal charge transfer (LMCT) effect and O-H vibration. This progress leads to the fluorescence signal-on of Er-MOFs and the production of a brown color. In view of this, a Er-MOFs-based sensor was constructed for rapid and on-site monitoring of S 2- in water, which shows the triple-signal outputs including fluorescence, absorbance and smartphone-based RGB analysis with high sensitivity and selectivity. More importantly, the successful measurement of S 2- in real water samples with satisfactory recoveries from 96.26 % to 104.03 %, demonstrating the practicality and effectiveness of Er-MOFs for S 2- recognition. Overall, this assay exhibits the promising applications for S 2- measurement in the fields of environmental pollution and food safety.
研究领域:
材料科学
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环境科学
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食品安全
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产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Senyang Liu,Xiaohu Liu,Xueyu Zhu,Jinhua Yin,Jie Bao
Large-capacity information encryption has attracted significant interest in the information age. The diversity and controllability of spectra have positioned them to be widely applied for information encryption. Current spectra-based information encryption methods commonly rely on either spectral alteration induced by external stimuli or the utilization of narrowband channels within spectra. However, these methods encounter a common challenge in attaining both high security and large capacity simultaneously. To address these issues, we propose a multiple-channel information encryption system based on quantum dot (QD) absorption spectra. The diversity of QD absorption spectra and their broadband features ensure that the encrypted spectra can hardly be decrypted without knowing the correct channel matrix. Meanwhile, the large capacity is realized through the combination of multiple QD spectral channels with a theoretical maximum capacity of 24.0 bits in a single spectrum. In order to optimize the performance of our proposed system, the selection principle of the channel matrix is established to achieve the rapid identification of the optimal channel matrix in several milliseconds. The additivity of QD spectral channels and the consistency of QD spectra are also explored to minimize the impact of errors on information decryption. Furthermore, two spectral encryption scenarios of spatial pattern and spectral pattern are applied to demonstrate the feasibility, showcasing their ability to achieve both a high level of security and large capacity. Owing to the advantages offered by QD spectra, the QD spectra-based information system exhibits excellent potential for broader applications in information storage, authentication, and computing.
研究领域:
光学
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信息科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Le Ma,Yang Hou,Jun Nie,Xiaoqun Zhu
The introduction of substituents affects the planarity of the molecule, resulting in different physical and chemical properties. This study synthesized four one-component visible light photoinitiators with different substituents derived from 1-naphthylamine. They were amine-free (BTX), primary amine (BTX-A), secondary amine (BTX-MA), and tertiary amine (BTX-DMA). The photophysical and photochemical properties were explored using UV–visible absorption spectroscopy combined with DFT theory computational simulations. They had excellent absorption properties in the visible light range ( ε : 3200–6300 L mol −1 cm −1 ). The structure of amine substitutions in the initiators showed different redshift phenomena. The maximum absorption wavelength of BTX in the visible region is 388 nm; only a 7 nm red shift occurred for the maximum absorption wavelength of BTX-DMA. While BTX-A had a maximum absorption wavelength of red shifting by 41 nm， the red shift for BTX-MA was about 53 nm, and its UV absorption tail extended to 520 nm. This phenomenon was known to be the result of the combined effect of electronic donor and molecular planarity according to the DFT theoretical calculations. The photopolymerization kinetics of four initiators used for double bond monomers was investigated by real-time FT-IR. The results indicated that polymerization could occur for all the designed systems; the highest double bond conversion could reach 92 % when BTX-DMA was used as a visible-light photoinitiator for the monomer of 2-hydroxyethyl acrylate (HEA).
研究领域:
材料科学
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化学工程
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光学
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产品关联
DOI
高影响因子
CHIRALITY
·
2020
·Vol. 32
·期 8
·1072-1079
·
IF 2.171
Xing Liu,Jinlong Yang,Zhihao Geng,Hongzhi Jia
We present a new method based on optical null methods for simultaneously measuring the optical rotatory dispersion (ORD) and absorption spectra of chiral substances. The optical rotation angle at a specific wavelength can be obtained from the optical nulls of the Malus curves with and without the sample. We use the optical nulls of the two curves as benchmark points and the readings to the right of the benchmark points by a certain angular offset to eliminate the influence of the analyzer on the light intensity and obtain the absorbance of the chiral substance at a specific wavelength. The 4096 pixels of the line scan CCD can measure multiple wavelengths simultaneously so that continuous ORD and absorption spectra can be obtained. The experimental results show that the standard deviation of the specific optical rotation is 0.11 deg mL g −1 dm −1 , the standard deviation of the maximum absorption wavelength is 0.45 nm, and that absorbance of the sample varies linearly with the concentration. This method is helpful for simplifying the experiment and has a profound influence on the analysis of the contents and molecular configurations of chiral substances in the future.
研究领域:
分析化学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Hu Lingling,Lu Weichao,Li Zhongjian,Liu Yue,Zhang Yun
A method is proposed to replicate the spectral curves of standard dyestuffs based on the mixing of absorption spectra between non-primary dyestuffs to quickly screen out the dyestuff components for the matching color of blended dyestuffs, so as to solve the problems of low color matching efficiency and high resource consumption in the dye development process. The relationship between the dye absorption spectra and color was explored first. The screening of non-primary dyes based on spectral and color characteristics of single dyes formed the initial formulation. A computer program implementing the least squares method was then developed to replicate the spectra of 15 different specimen dyes using their blending formulations, and the feasibility of these formulations was assessed by comparing them with the actual dyeing. It was found that 13 formulations could achieve the same color as the specimens under the illuminant D65, and 11 of them did not show any metamer mismatching under any of A and F02 light sources. The Goodness-of-Fit ( R n ) values of the spectral curves between all these 11 formulations and their specimens were greater than 0.95. After R n decreased from 0.95, four formulations showed metamerism, and 2 formulae could not achieve the same color under the illuminant D65. The above results indicated that there was a good correspondence between the consistency of the spectral curves and that of colors, and the method is feasible to match color and avoid metamer mismatching by successfully screening non-primary dyes.
研究领域:
纺织化学
·
染料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Qing Liu,Tigang Ning,Jing Li,Zhouyi Hu,Lanju Liang,Haiyun Yao,Xin Yan,Yongzhen Chen,Qingyi Wang,Shanghui Guan
Terahertz (THz) fingerprint metasensing is an effective method for identifying biological substances, offering advantages such as high efficiency and non-destructiveness. Currently, one important approach to achieving THz fingerprint spectrum sensing is the design of THz metasurface (MS) sensors with broad spectral coverage and multiple resonant peaks. However, there is still exhibit potential for further enhancement in the sensitivity, selectivity, and detection limits of THz sensors. Gallium nitride (GaN), with its exceptional optoelectronic properties such as high carrier concentration, high mobility, and excellent chemical stability, can be integrated with THz MSs to create high-performance sensors. In this study, we propose a THz MS biosensor coated with GaN. Since different analytes exhibit distinct absorption characteristics in the THz range, preliminary identification of various substances can be achieved by analyzing differences in the trends of spectral amplitude changes. Experimental results demonstrate that the proposed metasensor achieves a detection limit of 1 μg/mL for bovine serum albumin (BSA) and 10 pg/mL for creatinine. Through radar chart analysis, the transmission spectra of the metasensor show significant differences when detecting creatinine and BSA, indicating its capability to effectively identify different analytes. The GaN metasensor developed in this study provides a highly sensitive and broadly spectrally covered solution for THz fingerprint spectrum analysis, which holds potential applications in assessing kidney function and health status.
研究领域:
生物医学工程
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材料科学
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分析化学
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产品关联
DOI
高影响因子
Photonics Research
·
2024
·Vol. 12
·期 7
·1542-1547
·
IF 6.6
Zhibo Hou,Zhibo Hou,Liao Chen,Liao Chen,Rongwu Liu,Rongwu Liu,Chi Zhang,Chi Zhang,Xiaojun Wu,Xiaojun Wu,Xinliang Zhang,Xinliang Zhang,Xinliang Zhang
The terahertz (THz) absorption spectrum is a powerful method to identify substances. The improvement focuses on sensitivity and recovery ability. Here, we demonstrate enhanced THz vibrational absorption spectroscopy based on an on-chip THz whispering gallery mode resonator (THz-WGMR). A THz-WGMR with high Q can store energy and enhance the interaction between the THz waves and the target substances to capture the unique absorption fingerprint information. Therefore, it possesses significant sensitivity to identify trace amounts of substances. As a proof of concept, lactose powder and glucose powder are applied to demonstrate the effectiveness of our approach in recovering fingerprint absorption spectroscopy. Compared with a straight waveguide, the high sensitivity of the THz-WGMR is illustrated. The change of the transmissivity caused by the lactose reaches 7.8 dB around 532 GHz for the THz-WGMR, while only 1.4 dB for the straight waveguide, demonstrating the state-of-the-art sensing performance in fingerprint absorption recovery. We believe the proposed integrated THz-WGMR will promote the THz identification of tiny fingerprint substances.
研究领域:
物理学
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光学
·
材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18204-18213
·
IF 10.7
Qingsheng Zhang,Shuya Yuan,Huabing Yin,Jianjun Yang,Zhongjie Guan
The photocatalytic pure water splitting performance of photocatalysts is still restricted by the low utilization efficiency of photogenerated holes. Recent studies suggest that metal oxide clusters can efficiently abstract holes from a bulk photocatalyst via discrete energy bands. However, the decay dynamics of excited states in such a heterostructure have not been explored. Herein, ultra-small CoOx clusters decorated on ZnIn2S4 (ZIS) are prepared for pure water splitting. Experimental characterization studies confirm that CoOx clusters efficiently capture holes from ZnIn2S4, thus inhibiting charge recombination. Femtosecond transient absorption spectroscopy (fs-TAS) reveals that the lifetime of holes trapped by CoOx clusters is prolonged to 911.6 ps, enabling more opportunities to participate in the surface reaction. Moreover, density functional theory calculation suggests that the CoOx cluster is the preferential adsorption site for H2O to boost surface water oxidation. Benefiting from the above factors, the optimized CoOx/ZIS shows improved H2 and H2O2 evolution rates of 404.1 μmol g−1 h−1 and 371.9 μmol g−1 h−1 under visible light irradiation, respectively, which are about ten times higher than that of pure ZIS. The study highlights the significance of efficient hole extraction for improving photocatalytic pure water splitting performance.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
iScience
·
2022
·
IF 6.107
Wei Shi,Chunhui Li,Haiqing Wang,Zhiquan Wang,Lei Yang
Owing to the characteristics of THz wave, the terahertz time-domain spectral (THz-TDS) system has potentials in the field of biological macromolecule detection. However, water with strong absorption effect on THz wave exists in most biological detection, so the research focus in this field is to study aqueous samples. In view of these, THz spectroscopy system has research value for qualitative and quantitative detection of α-lactose and its water-containing samples. This research used a THz-TDS system with LiNbO 3 crystal to generate strong THz wave that was used to test 0.29 mmol α-lactose samples with water content of 15 μL–930 μL by using attenuating total reflection (ATR) prism. The absorption peak at 0.53 THz is detected, and with the increase of water content, the curve of absorption spectrum is observed to move up on the whole. This research has a guiding role for the test and improvement of water content limit in this field.
研究领域:
生物物理学
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分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2024
·
IF 2.6
Zijian Sun,Weiqiang Cai,Jiaying Xu,Xiying Ma,Xiaoyu Zhang
This paper investigates the microstructure, morphology and optical properties of manganese (Mn)-doped molybdenum disulfide (MoS 2 ) films with a triangular shape fabricated by the chemical vapor deposition method. X-ray diffraction and X-ray photoelectron spectroscopy show that the Mn element is successfully doped into MoS 2 film. Mn doping results in a shift in the absorption spectrum because of the changes in the band structure of the doped films. I – V curves indicate about a 50% reduction in the photocurrent onset voltage for the Mn-MoS 2 film under different light intensities. The results demonstrate that Mn doping improves the electronic structure of MoS 2 film, which is of significant importance for applications in optoelectronic sensing and photocatalysis.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
APPLIED SPECTROSCOPY
·
2024
·
IF 2.2
Rui Cheng,Thomas G. Mayerhöfer,Johannes Kiefer
Attenuated total reflection (ATR) spectroscopy in infrared is a standard tool used in most analytical labs, as it allows a rapid chemical analysis with virtually no sample preparation. However, when the sample contains materials with a high refractive index, special care must be taken as the resulting data may be severely biased. This article reports a theoretical approach to correcting distorted ATR spectra. Starting from Snell's law, Lorenz model and Fresnel's equations are combined to obtain the complex relationship between optical constants. With calculating the real and imaginary parts, that is, n(ν) and k(ν), respectively, of the complex refractive index from the absorption spectrum, a model for mixtures comprising of a liquid and a solid is established. The effects of distortion and potential misinterpretation of the data are discussed. Proof-of-concept experiments with mixtures of carbonaceous materials and toluene confirm the theoretically predicted observations.
研究领域:
分析化学
·
光谱学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）