JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Xi Li,Xiao Zhang,Shiwen Wang,Peng Yu,Yanhua Xu,Yongjun Sun
To suppress the electron–hole recombination and enhance the electron transfer on carbon nitride , an Fe-doped porous carbon nitride catalyst (Fe/SCN) was synthesized via supramolecular self-assembly method and applied in heterogeneous Fenton activation for efficient tetracycline (TC) degradation. Various characterizations revealed that the catalyst exhibited excellent visible light capture performance and electron transfer capacity . The highest degradation efficiency and mineralization rate of TC (10 mg L −1 ) were achieved under neutral condition (90.3% and 61.2%, respectively) with the leaching of Fe less than 14 μg L −1 . Free radical quenching experiments and spin-resonance spectroscopy characterizations revealed the dominating role of OH in TC degradation, and density functional theory calculation confirmed the formation of Fe-N X and revealed the interaction between Fe sites and H 2 O 2 . Three possible pathways of TC degradation were proposed, and the biological inhibition test revealed the potential of Fe/SCN/H 2 O 2 system to reduce environmental risks caused by TC. This work provides a new insight into the design of metal-doped heterogeneous Fenton catalyst for the efficient degradation of antibiotic contaminants in water.
研究领域:
环境科学
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材料科学
·
化学工程
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yujing Zuo,Xiaoni Wang,Zhiming Gou,Weiying Lin
Enhancing of the photostability of the fluorescent probes is a crucial task for promoting the performances. A unique polysiloxane-based imidazolium ionic liquid ( PSI ) was found to improve the photostability of the fluorescent probe. In this study, we reported the rational design and synthesis of a novel kind of polysiloxane-based imidazolium derivative ( PSI ) prepared from 1,3-bis(3-aminopropyl)tetramethyldisiloxane and aldehyde through the poly-radziszewski reaction for the first time. PSI was then functionalized by thionaphthalic anhydride ( NA ) to fabricate ionic liquid based fluorescent probe PSI-NA for the detection of SCN − . This work represented the first report for the construction of poly-ionic based fluorescent probes. Compared with small molecule probe, PSI-NA exhibited high stability and further applied in bioimaging and paper-based sensor fields. This work presented a valid approach for enhancing the photostability of fluorescent probes.
研究领域:
化学
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生物医学工程
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材料科学
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 1
·1-15
·
IF 3.8
Wang Tingting,Zhang Lucheng,Zhang Mingqing,Yang Fang,Wu Shilong
The widespread use of cyanidation in gold beneficiation leads to a large amount of SCN − in the gold extract tail solution, which poses a threat to the environment and human health. The present study successfully synthesized octadecyltrimethylammonium bromide/bentonite/titanium dioxide (OTAB/Bt/TiO 2 ) photocatalysts through a sol–gel hydrothermal approach. Evaluation of the BET specific surface area, X-ray diffraction (XRD) analysis, UV–vis diffuse reflectance spectroscopy, and zeta potential experiments unveiled the beneficial impact of incorporating OTAB. This inclusion led to an enlargement of the pore size and layer spacing of Bt, broadening the range of photoresponses. Additionally, it effectively neutralized the negative charge residing on the surface of Bt. Consequently, these enhancements contributed to the improved performance of the photocatalytic material in terms of adsorption and catalytic degradation of SCN − . The degradation rate of SCN − reached 98.78% under the reaction conditions of initial SCN − concentration of 50 mg/L, OTAB/Bt/TiO 2 dosage of 0.8 g/L, pH = 8, and reaction time of 300 min. The degradation of the SCN − composite through the OTAB/Bt/TiO 2 photocatalytic process followed a zero-order kinetic model with a calculated rate constant ( k value) of 0.1148 min −1 . Notably, this rate constant was 1.9 times greater than the degradation rate observed in the pure TiO 2 system. The free radical quenching test showed that h + , ∙OH and ∙O 2− were the main oxidizing substances for photocatalytic degradation. The identification of intermediates proved that the complete mineralization of SCN − could be achieved by OTAB/Bt/TiO 2 adsorption and photocatalytic degradation without generating the highly toxic intermediate CN − . Overall, this study provides guidance for the development of more photocatalysts with strong adsorption properties and more effective removal of SCN − from gold extraction tailings.
研究领域:
环境科学
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材料工程
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化学工程
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纳米技术
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DOI
高影响因子
Small
·
2023
·Vol. 19
·期 38
·2302302
·
IF 13.3
Zhao He,Jian Zhu,Xin Li,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
In this paper, Au@Ag nanopencil is designed as a multimodality plasmonic nanoprobe based on asymmetric etching for the detection of SCN − and ClO − . Au@Ag nanopencil with Au tip and Au@Ag rod is prepared by asymmetric tailoring of uniformly grown silver-covered gold nanopyramids under the combined effect of partial galvanic replacement and redox reaction. By asymmetric etching in different systems, Au@Ag nanopencil exhibits diversified changes in the plasmonic absorption band: O 2 •− facilitated by SCN − etches Au@Ag rod from the end to the tip, causing a blue shift of the localized surface plasmon resonance (LSPR) peak as the aspect ratio decreases; while the ClO − can retain Au@Ag shell and etch Ag within rod from the tip to the end, causing a redshift of the LSPR peak as the coupling resonance weakens. Based on peak shifts in different directions, a multimodality detection of SCN − and ClO − has been established. The results demonstrate the detection limits of SCN − and ClO − are 160 and 6.7 n m , and the linear ranges are 1–600 µ m and 0.05–13 µ m , respectively. The finely designed Au@Ag nanopencil not only broadens the horizon of designing heterogeneous structures, but also enriches the strategy of constructing multimodality sensing platform.
研究领域:
纳米材料
·
分析化学
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生物传感
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shasha Cheng,Nan Su,Pingfan Zhang,Yuhai Fang,Jilong Wang,Xiangtong Zhou,Hongjun Dong,Chunmei Li
Hydrogen extraction from the water splitting driven by solar energy is considered to be a sustainable technology, but it is still a challenging issue to develop high-efficient and stable photocatalysts. Herein, a new metal-free polymeric carbon nitride (PCN)-based Van der Waals (VdW) heterojunction photocatalyst is exploited by controlling the micro-morphologies of another structural unit, the unique 2D/1D microstructure of which is fabricated by decorating polythiocyanogen (SCN) x nanoribbons on PCN nanosheets. The coupling effect of (SCN) x on PCN effectively propels interplanar charge separation through Z-scheme charge transfer path formed by the compact face-to-face π-π electronic interaction between them. Moreover, the 1D nanoribbon morphology of (SCN) x also can shorten one direction of charge migration distance in the plane to inhibit the intramolecular carrier recombination compared with traditional 2D structure. The resultant photocatalytic hydrogen evolution (PHE) rate on the optimal PCN/(SCN) x -3 % sample reaches about 4 times as large as pure PCN, and a high apparent quantum efficiency (AQE) of 18.5 % is also achieved at 420 nm. This work develops a new design approach based on spatial dimension regulation strategy of structure unit for developing PCN-based VdW heterojunction photocatalyst applied to hydrogen production from the water splitting.
研究领域:
材料科学
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纳米技术
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光催化
·
可再生能源
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 5
·540-546
·
IF 1.067
Hong Jian,Zhou De-xia,Hao Hong-xing,Zhao Min,Bian Hong-tao
Hydrogels show versatile properties and are of great interest in the fields of
bioelectronics and tissue engineering. Understanding the dynamics of the water
molecules trapped in the three-dimensional polymeric networks of the hydrogels
is crucial to elucidate their mechanical and swelling properties at the
molecular level. In this report, the poly(DMAEMA-co-AA) hydrogels were
synthesized and characterized by the macroscopic swelling measurements under
different pH conditions. Furthermore, the microscopic structural dynamics of pH
stimulus-responsive hydrogels were studied using FTIR and ultrafast IR
spectroscopies from the viewpoint of the SCN − anionic solute as the
local vibrational reporter. Ultrafast IR spectroscopic measurements showed the
time constants of the vibrational population decay of SCN − were
increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from 2.0
to 12.0. Rotational anisotropy measurements further revealed that the rotation
of SCN − anionic probe was restricted by the three-dimensional network
formed in the hydrogels and the rotation of SCN − anionic probe cannot
decay to zero especially at the pH of 7.0. These results are expected to provide
a molecular-level understanding of the microscopic structure of the cross-linked
polymeric network in the pH stimulus-responsive hydrogels.
研究领域:
生物材料学
·
分子动力学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shaohua Ma,Weidong Zhu,Tianjiao Han,Chunfu Zhang,Peng Gao,Yonggang Guo,Zhicheng Song,Yufeng Ni,Dayong Qiao
High-quality, stable perovskite films with a wide band gap between 1.65 and 1.80 eV are highly suitable for efficient and cost-competitive silicon-based tandem solar cells. Herein, we demonstrate that the combined strategies of the Pb(SCN)2 additive and air annealing can enable the Cs0.22FA0.78Pb(I0.85Br0.15)3 films with a wide band gap of 1.65 eV and favored properties including pure composition, high crystallinity, micro-sized grains, and reduced defects. With these desired films, the average efficiencies of semitransparent perovskite solar cells (PSCs) are boosted from (18.13 ± 0.31) to (20.35 ± 0.28)%. Further, the semitransparent PSC is used to assemble the four-terminal perovskite/TOPCon tandem solar cell. Benefiting from its excellent performance and preferred optical properties, the obtained tandem solar cell yields a milestone efficiency of 30.32%.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Fufeng Cai,Wei Zhu,Jessica Juweriah Ibrahim,Guomin Xiao
This work demonstrated the possibility of hydrophobic ionic liquid tricaprylmethylammonium thiocyanate ([A336][SCN]) as a solvent in the separation by extraction of polyhydric alcohols from their mixtures with water. The knowledge of (liquid + liquid) equilibrium (LLE) of these mixtures is essential for the design of the extraction process. For this reason, the LLE data of the ternary systems {[A336][SCN] + water + glycerol, or ethylene glycol, or 1,2-propanediol, or 1,3-propanediol} were determined at T = 303.2 K and atmospheric pressure. The reliability of the tie-lines data was ascertained by applying the Othmer–Tobias equation, and the non-random two liquid (NRTL) model used to fit the experimental LLE data. The effectiveness of the extraction of polyhydric alcohols from water was evaluated using the solute distribution ratio and the selectivity. The extraction capability of [A336][SCN] was compared with that of other ILs. The results indicated that the [A336][SCN] was suitable for use as a solvent in (liquid + liquid) extraction of polyhydric alcohols from water.
研究领域:
化学工程
·
分离科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yuren Xia,Cheng Zhao,Peiyang Zhao,Lingyun Mao,Yucheng Ding,Daocheng Hong,Yuxi Tian,Wensheng Yan,Zhong Jin
Hybrid organic-inorganic halide perovskite solar cells (PSCs) have achieved intriguingly high photoelectric conversion efficiencies (PCEs), but their operational stability is still not satisfactory owing to their vulnerability to moisture and heat. Herein, we report the introduction of pseudohalide thiocyanate ions and potassium dopants into formamidinium lead triiodide (FAPbI 3 ) to obtain a new class of pseudohalide-substituted lead halide perovskites FAPb(SCN) 2 I that can be prepared in ambient air and exhibit broad-range light absorption. Through the introduction of K + -cation doping, hole-conductor-free PSCs based on a FA 0.98 K 0.02 Pb(SCN) 2 I perovskite light absorber and a low-cost, screen-printable carbon-based counter electrode exhibited a PCE of 13.39%. Importantly, the FA 0.98 K 0.02 Pb(SCN) 2 I-based hole-conductor-free PSCs exhibited an 88% PCE retention even after continuous heating at 100 °C for 1020 h, indicating excellent thermal stability. This study suggests that the compositional engineering of non-iodine X-site pseudohalide anion substitution and A-site cation doping hold great promise for improving the stability of PSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Yuwan Zhu,Guangquan Wang,Kai Zong,Dongshun Deng
NH3 has attracted increasing attention as a fundamental material and promising hydrogen carrier. The uptake of NH3 from NH3-containing exhausted gas presents economic and environmental issues. In this study, [MEA][SCN] was paired with glycerol, acetamide, formamide, phenol (PhOH), ethylene glycol, urea, glycerolformal, or 1,3-dimethyl-2-imidazolidinone to construct deep eutectic solvents (DESs) for effective NH3 absorption and NH3/CO2 separation investigation. All of the [MEA][SCN]-based DESs exhibited good NH3 absorption and separation performance. Notably, [MEA][SCN]-PhOH (1:1) realized an atmospheric capacity of 0.2459 g of NH3·g–1 DES and NH3/CO2 selectivity of 194.53 at 303.15 K. Based on the experimental data, a new process for NH3 recovery from melamine tail gas using [MEA][SCN]-PhOH (1:1) (DES-M) was developed and simulated from operational parameters optimization, heat exchange network design, and economic evaluation. DES-M can recycle NH3 with purity of 99.6% and save 82.01% utility costs compared to the water scrubbing method. The heat integration network design in DES-M reduces 66.94% low-pressure steam and 9.00% separation costs. Specially, the optimized DES-M can exceed 59% after-tax rate of return using renewable energy.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuzhu Li,Zongbao Zhang,Yang Zhou,Lai Xie,Naitao Gao,Xubing Lu,Xingsen Gao,Jinwei Gao,Lingling Shui,Sujuan Wu,Junming Liu
Metal halide perovskite solar cells have drawn a lot of attention due to their excellent photovoltaic properties. However, a simple method to prepare perovskite films with high quality in ambient air remains a big challenge, which has become an obstacle for the commercialization of PSCs. Here we propose a facile method to prepare efficient CH 3 NH 3 PbI 3-x (SCN) x -based planar PSCs in ambient conditions and ammonium salts (NH 4 Cl, NH 4 SCN) are used to regulate the microstructure of CH 3 NH 3 PbI 3-x (SCN) x perovskite film prepared in ambient air. At the optimal concentration, the devices with NH 4 Cl or NH 4 SCN additives achieve the champion efficiency of 14.71% and 16.61% respectively, which are much higher than the 12.97% of the reference device. The stability of the unsealed devices with additives in ambient air has also been significantly improved. The modified devices without any encapsulation still retain about 80% of initial efficiency after 30 days in ambient air. The conductive atomic force microscopy and photoluminescence measurement are used to characterize photoelectric properties of perovskite film. The trap-state density and charge recombination of the devices have been investigated. The results suggest that the improved photovoltaic characteristics and stability may be attributed to the improved quality of perovskite films, the reduced trap states and the suppressed charge recombination.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Zongbao Zhang,Yang Zhou,Yangyang Cai,Hui Liu,Qiqi Qin,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Planar perovskite solar cells (PSCs) based on CH 3 NH 3 PbI 3- x (SCN) x (SCN: thiocyanate) active layer and low-temperature processed TiO 2 films are fabricated by a sequential two-step method in ambient air. Here, alkali thiocyanates (NaSCN, KSCN) are added into Pb(SCN) 2 precursor to improve the microstructure of CH 3 NH 3 PbI 3- x (SCN) x perovskite layers and performance of the as-prepared PSCs. At the optimum concentrations of alkali thiocyanates as additives, the as-prepared NaSCN-modified and KSCN-modified PSCs demonstrate the efficiencies of 16.59% and 15.63% respectively, being much higher than 12.73% of the reference PSCs without additives. This improvement is primarily ascribed to the enhanced electron transport , reduced recombination rates and much improved microstructures with large grain size and low defect density at grain boundaries. Importantly, it is revealed that the modified PSCs at the optimized concentrations of alkali thiocyanates additives exhibit remarkably improved stability than the reference PSCs against humid circumstance, and a continuous exposure to humid air without encapsulation over 45 days only records about 5% degradation of the efficiency. These findings provide a facile approach to fabricate efficient and stable PSCs by low processing temperature in ambient air, both of which are highly preferred for future practical applications of PSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
·
光电化学
·
半导体器件
·
薄膜物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）