MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 6
·1817-1825
·
IF 4.58
Li Qiu-Lin,Huang Fang,Wang Xiao-Li,Wang Xia,Zhao Ru-Song
The high performance solid-phase microextraction (SPME) of polar phenols from aqueous matrices is a challenge due to the strong interaction between water molecules and polar phenols. The authors describe the fabrication of stainless steel fibers coated with multiple helix 3D metal-organic nanotubes via physical adhesion, and their application to the SPME of 2-chlorophenol, 2-nitrophenol, 2,4-dichlorophenol, 4-chloro-3-methylphenol and 2,4,6-trichlorophenol from water samples. GC/MS was used for sample quantification and detection. Box-Behnken design was adopted to optimize the experimental conditions through response surface methodology. The fibers display good thermal stability (~400 °C), high enrichment factors (418–1874), excellent repeatability (4.31%–8.37%), wide linear range (0.5–1000 ng⋅L −1 ) and low limits of detection (0.07–0.18 ng⋅L −1 ) for the phenols. This method was successfully applied to the analysis of phenols in environmental water samples.
Multiple helix 3D metal-organic nanotubes coated stainless steel fibers were fabricated. The fibers achieved good thermal stability (~400 °C), high enrichment factors (418–1874), excellent repeatability (4.31–8.37%), wide linear range (0.5–1000 ng L −1 ) and low limits of detection (0.07–0.18 ng L −1 ) for phenols.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Kai Yin,Yongxiu Deng,Chengbin Liu,Qunying He,Yuanfeng Wei,Shuo Chen,Tongcai Liu,Shenglian Luo
Although UV/chlorine advanced oxidation process has been employed to treat contaminants, the roles of secondary radicals are generally negligible. The comprehensive evaluation of secondary radicals on contaminants degradation remains deficient. In this study, two typical neonicotinoid insecticides, imidacloprid (IMD) and thiacloprid (THIA), were degraded via UV/chlorine process. It is for the first time found that the existence of Cl − significantly promoted THIA degradation during UV/chlorine process, attributed to the formation of Cl 2 − . In addition, the effects of pH, fulvic acid (FA), and bicarbonate (HCO 3 – ) on the degradation of IMD and THIA were evaluated. Low pH was in favor of the degradation of IMD and THIA, while both FA and HCO 3 – had slight inhibition effects. Meanwhile, the degradation of IMD and THIA via UV/chlorine process was inhibited in real matrices. The existence of Br − heavily suppressed the degradation of THIA via UV/chlorine process. The initial transformation pathways of IMD and THIA involved electron transfer, H-abstraction, and then disproportionation or the methylene bridge cleavage, yielding hydroxyl and keto derivatives as well as free amine. Although the mineralization for IMD (29%) and THIA (35%) was low, the acute toxicity to Vibrio fischeri for the treated samples was lower than that for corresponding parent compounds. This study comprehensively evaluated the degradation of IMD and THIA via UV/chlorine process, highlighting Cl 2 − as an important reactive species for THIA elimination.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Hu Cheng,Yang Song,Yongrong Bian,Rongting Ji,Fang Wang,Chenggang Gu,Xinglun Yang,Mao Ye,Gangfeng Ouyang,Xin Jiang
There is urgent demand for the design of advanced coating materials for solid-phase microextraction (SPME) for water quality monitoring and assessment because of the global occurrence of chlorobenzenes (CBs). In this study, we proposed a dual-order activation method in which potassium hydroxide is used to modify pre-activated calcium citrate to synthesize a highly developed meso-/microporous carbon (MMC). The as-obtained MMC presented well-developed porosity with a super-high specific surface area (2638.09 m 2 g −1 ), abundant meso-/micropores (0.5–10 nm), high hydrophobicity , excellent thermal stability (>720 °C), and a partly graphitized structure. As a coating material for headspace-SPME, the MMC-coated fiber exhibited outstanding extraction capability for CBs (up to 48.5 times higher than that of commercial fibers), which may be attributed to multiple interactions between the MMC and the pollutants, including size selectivity , micropore filling, π-π stacking and hydrophobicity. Finally, a satisfactory method using an MMC-coated fiber coupled with gas chromatography and electron capture detection was developed with good linearity (1–1000 ng L −1 , R 2 > 0.9982), high enrichment efficiencies (enrichment factors, 861–7819), low limits of detection (0.003–0.072 ng L −1 ), excellent repeatability (0.7–5.3%) and reproducibility (1.7–5.1%), and outstanding recoveries (90.18–103.02%) when applied to determine trace CBs in real water samples. These results suggest that MMC is a promising coating material for the SPME of CBs.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 12
·2411-2424
·
IF 4.239
Shuaiqi Ning,Shuai Mao,Chun Liu,Mingzhu Xia,Fengyun Wang
In this paper, some perovskite catalysts LaFeO3 (LFO) were prepared by using the efficient chelating properties of sodium diethylene triamine pentamethylene phosphonate (DTPMP-2Na) toward metal ions, and the best catalyst LFO-0.1 was selected by using diclofenac sodium as the target pollutant. Then, the influence of different factors (PMS dosage, catalyst dosage, substrate concentration and anion) on the degradation of DCF in a LFO-0.1/PMS system was studied. The catalyst was characterized, and the reaction mechanism of diclofenac (DCF) in the LFO-0.1/PMS system was analyzed. It was concluded that hydroxyl radicals, sulfate radicals and singlet oxygen were produced in the LFO-0.1/PMS system. In the reaction system, singlet oxygen is considered to be the main factor for DCF degradation in this system, and the generation of sulfate radicals is mainly attributed to oxygen vacancies and the electron transfer between Fe3+ and Fe2+. Through the centrifugal recovery of the catalyst to explore its stability, the conclusion is that LFO-0.1 is a stable catalyst. Finally, 15 kinds of oxidation intermediates and products were identified, and the possible degradation pathways of DCF were analyzed, including decarboxylation, dechlorination, C–N cleavage, hydroxylation, ring-closure and ring-opening.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yuwei Xue,Lihua Liu,Ting Zhang,Ziqi Zhu,Mingjun Xu,Qian Zhang,Junming Hong
There has been growing attention in the combination of metal oxide nanoparticles with metal-organic frameworks (MOFs) for the synergistically intensified catalytic activity . Herein, functional Fe-MOF@Mn 2 O 3 composites were synthesized to activate peroxymonosulfate (PMS) for 4-Cholophenol (4-CP) degradation via a hydrothermal and calcination method. Under the reaction parameters of 2 mM PMS, 0.2 g/L catalyst dosage, and pH 7.0, 91.4% of 4-CP (10 mg/L) could effectively be degraded within 60 min (2.2-fold increase in reaction rate constant compared with pure Mn 2 O 3 ). The excellent degradation performance of Fe-MOF@Mn 2 O 3 /PMS system was attributed to the surface hydroxyl and synergistic effect between iron and manganese. Quenching reaction and EPR analysis revealed both sulfate (•SO 4 - ) and hydroxyl radicals (•OH) were responsible for 4-CP degradation. The Fe-MOF@Mn 2 O 3 composite exhibited intensive catalytic capability as well as electron transfer efficiency according to the electrochemical measurements. Meanwhile, the possible degradation pathways were proposed by analyzing intermediates via LC-MS detection. The results indicates that the Fe-MOF@Mn 2 O 3 /PMS system is effective and adaptable for the treatment of 4-CP in different water conditions.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6456-6468
·
IF 2.779
Ni Yafei,Li Haoyue,Li Haimin,Zhuang Jia,Liu Xingchong,Zheng Ronghong,Zhao Shuangshuang,Zhang Hua,Wang Hanyu
It is crucial to promote crystallinity of active layer to improve stability and restrain non-radiative carrier recombination for high-quality perovskite solar cells (PSCs). Here, Chlorpheniramine Maleate (CM) interface layer is introduced between SnO 2 electron transport layer (ETL) and perovskite (PVK) film. The esterification between carboxyl group in CM and hydroxyl group on the surface of SnO 2 greatly enhances the surface evenness of SnO 2 , leading to enhanced smoothness of ETL; thus, the crystallinity of perovskite (PVK) film is validly improved. Meanwhile, the lone pair electrons of nitrogen element in pyridine group in CM coordinate with vacant orbit of Pb 2+ in perovskite that validly decreases the defects of active layer. Thus, the CM interface results into strong connection between PVK and ETL, which greatly enhances the performance and stability of PSCs. After CM modification, the PCE of the PSCs is increased from 19.29 to 21.12%. In addition, unencapsulated CM-modified devices demonstrate much better humidity stability than unmodified one due to high quality of the perovskite film. After 100 h under RH = 70 ± 5% in air condition, the SnO 2 -CM based device still remains 60% of its initial PCE, while the PCE of unmodified device totally breaks down after 72 h.
研究领域:
材料科学
·
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
Colloid and Interface Science Communications
·
2021
·
IF 4.914
Xiang Yan,Jie Yang,Juan Wu,Han Su,Guowen Sun,Yanhong Ni,Weibin Sun
The inflammatory outbreak caused by abundant bacteria propagation in the infected wound area pose a considerable challenge to human health. To overcome this situation, here the therapeutic method is based on inspired chemodynamic therapy (CDT) induced by a novel iron oxychloride nanosheets (FeOCl NSs) catalyst with hydrogen peroxide (H 2 O 2 ) and photothermal therapy (PTT) mediated by coating inorganic carbon dots (CDs) and organic polyethylene glycol (PEG) with near-infrared (NIR) emission. The redox cycle of ions on FeOCl NSs enables the generation of facile hydroxyl radical (·OH) from H 2 O 2 activation for further CDT and induces bacteria death. CDs have been set as promising in vivo therapeutic agents due to their excellent biosafety and high photostability. In this study, the nanocomposites FeOCl@PEG@CDs NCs are synthesized by coating the PEG and CDs on the FeOCl NSs, exhibiting a potent PTT responsive effect with 808 nm NIR laser, which highly enhances the antibacterial effect in the infected wound area.
研究领域:
生物医学工程
·
纳米医学
·
抗菌治疗
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 42
·15691-15700
·
IF 8.307
Shixun Wang,Ran Shi,Bing Tang,Yuan Xiong,Arsenii Portniagin,Xin Zhao,Stephen V. Kershaw,Run Long,Andrey L. Rogach
The co-doping of double perovskites is a useful approach in terms of improving their stability and photoluminescence quantum yield. Herein, Bi3+ and Te4+ cations have been co-doped into Cs2AgInCl6 nanocrystals. Doping with Te4+ cations promotes radiative recombination of self-trapped excitons due to increased defect formation energies of silver and indium vacancies, according to experimental and theoretical results. When used in excess, the TeO2 precursor would generate residual TeO2, Te2O3Cl2, R2TeO, or all three of them, which confined undesired chlorine ions on oxygen vacancies to counteract the pull from the Cs2AgInCl6 host, resulting in improved coordination with surface oleic acid ligands. As a result, 1% Bi and 8% Te co-doped Cs2AgInCl6 nanocrystals reach a high photoluminescence quantum yield of 34% and show an improved stability, maintaining over 70% of their original emission intensity after storage for more than 1 month. These findings are important in the context of producing high-performance properly doped double perovskite nanocrystals for optoelectronic applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Runjie Liu,Shiwei Liu,Shichang Sun,Xing Cao,Junhao Lin,Juan Peng,Fei Ji,Rui Ma
The traditional solidification/stabilization (S/S) technology, Ordinary Portland Cement (OPC), has been widely criticized due to its poor resistance to chloride and significant carbon emissions. Herein, a S/S strategy based on magnesium potassium phosphate cement (MKPC) was developed for the medical waste incineration fly ash (MFA) disposal, which harmonized the chlorine stabilization rate and potential carbon emissions. The in-situ XRD results indicated that the Cl − was efficiently immobilized in the MKPC system with coexisting Ca 2+ by the formation of stable Ca 5 (PO 4 ) 3 Cl through direct precipitation or intermediate transformation (the Cl − immobilization rate was up to 77.29%). Additionally, the MFA-based MKPC also demonstrated a compressive strength of up to 39.6 MPa, along with an immobilization rate exceeding 90% for heavy metals. Notably, despite the deterioration of the aforementioned S/S performances with increasing MFA incorporation, the potential carbon emissions associated with the entire S/S process were significantly reduced. According to the Life Cycle Assessment, the potential carbon emissions decreased to 8.35 × 10 2 kg CO 2 -eq when the MFA reached the blending equilibrium point (17.68 wt.%), while the Cl − immobilization rate still remained above 65%, achieving an acceptable equilibrium. This work proposes a low-carbon preparation strategy for MKPC that realizes chlorine stabilization, which is instructive for the design of S/S materials.
研究领域:
环境科学
·
材料科学
·
废弃物管理
✓ 已验证
DOI
PubMed
高影响因子
Water Quality Research Journal
·
2017
·Vol. 52
·期 2
·90-98
·
IF 0
Xu Ming,Gui Lei,Peng Shu-Chuan,Chen Tian-Hu,Wang Ji-Zhong
A method for determination of chlorophenols (CPs) in sediments was developed using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and gas chromatography–mass spectrometry (GC-MS) analysis. Some effective operational details and parameters on mixing of samples and extraction solvent, adsorption loss, and extraction cycles of the derivatives were studied and optimized. The calibration curves of standard solutions were observed in the range of 0.5–100 μg L −1 and correlation coefficients ranged from 0.998 to 0.999. The limits of detection (LOD s ) for individual CPs are in the range of 0.026–0.072 ng g −1 . The method showed good performance with the recovery efficiencies of target CPs in spiked sediment at 73.2–105.6%. In addition, the feasibility of applying the proposed method to determine the concentration of CPs in field core sediment samples collected in three shallow lakes in Eastern China was examined. The obtained results show that the present method is a sensitive, simple, low cost and highly feasible method for determination of CPs in sediment samples.
研究领域:
环境分析化学
·
环境污染
·
有机污染物检测
·
沉积物化学
·
水质科学
✓ 已验证
DOI
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2024
·Vol. 44
·期 5
·1951-1969
·
IF 2.6
Siyuan Sui,Guohua Ni,Hongmei Sun,Ling Kong,Tao Sun
In this paper, a novel method is presented to enhance the antimicrobial properties of polyvinyl chloride (PVC) via plasma-induced grafting of quaternary ammonium (QA). The results show that the content of oxygen-containing functional groups on PVC surface is significantly increased after Ar-O 2 plasma treatment, beneficially enhancing the thickness and adhesion of QA coating. Plasma treatment time critically affects the morphology of PVC surface, which is closely related to the number, depth and diameter of pit on the surface. With the increase of pits size, the PVC surface forms ridge-like protrusions. The coating formed by grafting QA maintains the morphology characteristics of plasma-treated PVC surface. Results of antibacterial test show that specimens have the best antibacterial activity when there are a high and sharp ridge-like structure of QA coating on the plasma-treated PVC surface.
研究领域:
生物材料学
·
表面科学
·
高分子化学
·
抗菌材料
·
医学工程
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2023
·Vol. 15
·期 2
·2603-2617
·
IF 4
Yang Xiaojian,An Mengmeng,Han Nannan,Zhang Shu,Rong Qianqian,Lu Hui
The adsorption and removal of chlortetracycline (CTC) from water on peanut shells decorated with magnetic particles under ultrasonic were studied. The morphology, components, functional groups, magnetic properties and BET surface area of peanut shells before and after decorated with magnetic particles were characterized. Further, the effects of contact time, temperature and initial pH value on adsorption were investigated. Meanwhile, the adsorption kinetics and regeneration performance were studied. The CTC adsorption of magnetic peanut shells can reach 82.96%, and the adsorption behavior of CTC by magnetic peanut shells can be described using pseudo-second-order kinetics model. Finally, the adsorption capacity of CTC merely decreases by 9.52% after recycling five times, and solid-liquid separation can be easily achieved under magnetic field applied. Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）